Numerical fluid structural interface analysis in condenser microphone design
|
|
- Lorraine Cole
- 5 years ago
- Views:
Transcription
1 Journal of Mechanical Science and Technology 5 (3) () 65~6 DOI.7/s Numerical fluid structural interface analysis in condenser microphone design Akbar Ranjbar, Mohammad-Ali Saeimi-Sadigh and Bashir Behjat * Acoustic Research Center, Electrical Engineering Department, Shahed University, Tehran, Iran (Manuscript Received June, ; Revised Ocotober 3, ; Accepted November, ) Abstract Condenser microphones are widely used in electronic and acoustic applications. Although, various mechanical and electro-mechanical methods have been developed to design and analyze these sensors. However, due to the difficulty of fluid-structural-electrical couplings, none of them can introduce a method that consider all parameters of the design together. This research concerns the effects of four main parameters: a) Air gap size; b) Number of holes on the back-plate; c) holes radius size and d) location of the holes in back plate, on the response of the microphones. This analysis have been carried out based on coupled finite element and finite volume method using ANSYS-CFX software to simulate fluid-structure interaction between the diaphragm and air in the air-gap region. By using this method, the effects of the geometric parameters on the response of the microphone have been investigated. Results show that, increasing air gap size, holes radius, and holes number decrease the damping effects of the air between diaphragm and back plate. On the other hand, increasing the distance between the holes has the opposite effect. In addition, results reveal that among these four parameters, increasing the number of holes on back plate is the most efficient method in reducing air-gap damping effects. Keywords: Condenser microphone; ANSYS-CFX; Finite element methods; Fluid structure interaction Introduction Up to now, there has been much research on theoretical modeling and numerical analysis of condenser microphones. These models are mainly based on transforming the microphone structure into equivalent mechanical or electrical components and these equivalent models are analyzed by basic mechanical equations []. In the next paragraph some recent numerical and analytical works have been reviewed. For the first time Zucherwar [] presented an analytical response for the microphone. His results were based on the model which includes all microphone geometrical characteristics. He solved the formulas which resulted from the fluidstructure analysis of the model, however he did not consider the initial voltage and pretension in his analysis. In 98, Zhon [3] determined the microphone sensitivity. He used microphone average diaphragm displacement in his work and included all microphone geometrical characteristics, air viscosity and the effect of the different parameters on the microphone response such as air gap and hole dimensions. In 994, Donk et al. [4] obtained the microphone static response from an analytical model. Although they just modeled the air gap This paper was recommended for publication in revised form by Associate Editor Seockhyun Kim * Corresponding author. Tel.: , Fax.: address: bashir.behjat@gmail.com KSME & Springer and excluded other geometrical parameters, but including the initial voltage and tension in derived equations and studying of its effects on the microphone response were the advantages of their research. In 997 Mutschlecner [5] used fluid approximation for gases to present theoretical analyses for the microphone. He took into acount the interaction between fluid and structure while he ignored the diaphragm initial voltage and tension in their dynamic analysis. Pedersen [6] presented a complete discrete model for microphone. In his work, all geometrical characteristic of the system have been modeled by an equivalent electric circuit. Circuit element values were calculated considering the fact that energies that stored in both systems have the same value. Pedersen took into account the initial diaphragm tension, but he did not look over the initial voltage. A finite element microphone analysis was presented by Ying in 998 [7]. He modeled the microphone diaphragm by ANSYS software and ignored the fluid- structure coupling, but he considered the diaphragm initial tension. Rajalingham [8] took into consideration the non-linear electrical force and diaphragm analytical equations. He solved the nonlinear equations by Newton-Raphson method. Kainz [9] worked on acoustical dispersion from diaphragm and he used matrix transformation to solve the coupling equations. Dadic [] modeled condenser microphone using finite element method. This method was used to determine microphone nonlinear characteristics and the effect of nonlinear electrical field on
2 66 A. Ranjbar et al. / Journal of Mechanical Science and Technology 5 (3) () 65~6 the microphone mechanical components. Also an appropriate electrical analysis for electrical parameters has been performed. Chen et al. [] have obtained the complete diaphragm equations under electrical charge by using the theory of plates and shells. Then they transformed these equations into mechanical equivalent circuit and performed an electrical analysis. In this paper the microphone fluid-structure coupling problem has been investigated. The microphone has been modeled with all of the geometrical characteristics in ANSYS software, then using CFX software (one of the ANSYS Products); coupled fluid-structural analysis has been performed. It is worth to note that all the geometrical characteristics and initial tension of diaphragm have been taken into account in his analysis.. Microphone theoretical response Generally, fluid structure coupling issue emerges in the diaphragm air layer coupling equations in condenser microphone and includes equation of motion, Navier-Stokes equation, continuity equation, and equation of state. Considering these equations and the momentum transfer equation, the diaphragm displacement could be finalized as []: ( θ ) p,, (, ) (, ) i p r z η r θ + k η r θ = +. () T T This equation is written in the cylindrical coordinate system (r,θ,z) and in the time domain. p i is the incident sound pressure on the diaphragm, p is the reaction pressure on the diaphragm, η is the displacement of the diaphragm, T is the pretension in the diaphragm and k is the number of sound wave in the diaphragm which is defined as: k σ = πω M T where σ M is the diaphragm mass surface density and ω is the frequency of sound. Eq. (l) is a mixed integral-differential equation. Because the reaction pressure depends on the integral of the diaphragm displacement η, on the diaphragm surface. We assumed a uniform distribution of sound pressure on the surface of the diaphragm. The air velocity can be stated as scalar potential and vector potential function: V = gradφ + A (3) where A is the vector potential and is the scalar potential. The following condition should hold for the vector function A: divα=. (4) () While k=w/c and L=iw/ν are number of scalar and vector wave numbers, c is the sound speed in air and ν is the kinematic viscosity of air. The above equations include the microphone air diaphragm coupling, although the non linear electric force is not considered. 3. Microphone modeling The presented model in this section (Fig. ) includes diaphragm, back plate, air gap, back chamber, and the holes. Fluid structure coupling occurs between the diaphragm and the air available in the air gap. The coupling should be defined for the software between the diaphragm and the air in the air gap. Initial diaphragm tension is also modeled, so the effect of this tension on the bending reaction of the diaphragm is equivalent to the Young s Modulus increasing. The equation of the plate that includes initial tension is defined [3]: dr r dr a r D z d φ dφ k q + + φ + = where a, is the radius of the diaphragm, D is the flexural rigidity of plate, the is related to displacement by φ=dw/dr and q is the applied pressure on the diaphragm. The final solution of the above equation with clamped boundary condition: 4 kr qa J J ( k ) a qa a r w = kj k D 4kD ( ) ( ) 3 W is the displacement for the diaphragm under tension T. Also J and J are first and second Bessel type functions respectively. For a regular diaphragm with the same boundary condition without initial tension, the displacement is: 4 qa r w =. 64D a By equating the Eqs. (7) and (8), it will result the Young s Modulus of the diaphragm under specific initial tension 4 Ta D =. Ta 6D J D The resulted nonlinear equation is solved simultaneously in each steps using ANSYS and CFX software solution. (6) (7) (8) (9) Substituting Eqs. (3) and (4) into the Eq. (), yields: φ + k φ = + = o, A LA o, (5) 4. Results In this section, results of the fluid-structure analysis including diaphragm deflection and the velocity and the pressure of
3 A. Ranjbar et al. / Journal of Mechanical Science and Technology 5 (3) () 65~6 67 Fig.. The model used for simulation. Fig. 3. Air gap mesh. Fig.. The model of the Diaphragm s mesh. Fig. 4. Back plate holes and outside ring mesh model. the air have been presented. In addition, effects of different parameters such as air gap distance, number of the holes, and location of the holes on the microphone general operation and sensitivity have been investigated. 4. Finite elements model In this section the fluid and structure mesh model is presented. The diaphragm is very thin stainless steel having young modulus of 7 GPa and mass density of 78 kg/m 3. Table depicts the geometric parameters of the microphone which have been used in each case study. For the diaphragm modeling, the Shell 63 element has been used. The boundary conditions are applied by defining zero values for the displacement and the rotation in the diaphragm outer nodes. To reduce the computational time, the meshes are finer where there is high pressure gradient and are larger elsewhere. The number of elements that have been used in this model, includes 36 for air gap, 6579 for back plate holes, and 3959 for the back chamber. The models are analyzed by ANSYS and CFX software using Intel (R) Core (TM) Duo with 4GB RAM. Fig. shows the mesh of the diaphragm. There is an air gap between the diaphragm and the back plate which plays a damper role for the diaphragm displacement due to the pressure response. Mesh model for the air gap is shown in Fig. 3 which element 3D Flotran 4 for fluid mesh has been used. Fig. 4 shows the back plate holes mesh with outside ring region between the back plate and the microphone body. Back chamber mesh model is shown in Fig. 5. Due to the very thin air gap thickness, there was not a uniform mesh model possibility, hence the air gap mesh was done by three different sections and then these sections were assembled in CFX software. 4. Method of analysis To design a condenser microphone, a fluid- structure numerical analysis has been performed to obtain deflection of the diaphragm in each case study. Modal and harmonic analysis are also necessary to obtain mode shape and system response in different frequencies. Differential equation for transient analysis is:... () M X+ CX+ KX = f t. () In the above equation, M is the system mass matrix, C is the damping matrix, K is the stiffness matrix and f(t) is the load vector. In this section the results of structure dynamic response computation under time varying load has been presented. The results are shown as the contour of the displacement; Von-Mises effective stress and fluid pressure diagram.
4 68 A. Ranjbar et al. / Journal of Mechanical Science and Technology 5 (3) () 65~ gap micron gap 3micron gap 5 micron pressure(pas) line Fig. 5. Isometric diagram of back chamber mesh model. Pressure(pas) pressure.e+.e- 4.E- 6.E- 8.E-.E+.E+ Time(sec) Fig. 6. Time varying loading vector. Displacemnt(m).E-6 5.E-7.E+ -5.E-7 -.E-6 -.5E-6.E+.E- 4.E- 6.E- 8.E-.E+.E+ Time(sec) Fig. 7. Diaphragm transient response without structure fluid coupling. Fig. 7 shows the transient dynamic response for the diaphragm without fluid-structure coupling with zero damping coefficients under time varying load as shown in Fig. 6. Loading process is implemented in a specific time interval, which could be obtained from working frequency after harmonic analysis. During the process, the pressure was reached to its maximum from zero and then removed from the diaphragm in a very short time interval. Fig. 7 indicates that after removing the pressure, the diaphragm is oscillating within.36 micrometer amplitude due to the inertia forces and no damping effect. However, in condenser microphone, the air flow between the diaphragm and back plate will result in a damping force which causes the U_Z Fig. 8. Air gap effects on the pressure produced on the back plate and on its radius. oscillating amplitude to decay. In this section variable loading vector is defined up to the maximum pressure exertion moment since the goal is to determine the design parameters effect on the diaphragm deflection. Applied pressure value on the models under consideration is 5 Pa. To consider air gap increase effects on diaphragm deflection, the model was analyzed with three different air gap distances of, 3, and 5 microns. Parameters effect analysis was performed through preparing plate pressure contours and also diaphragm deflection counter. Diaphragm deflection will increase with pressure gradient decrease due to increase of air gap, so it was concluded that increasing the air gap is an effective tool to decrease the fluid damping effect. The diagram of pressure on the back plate is shown in Fig. 8. Since the produced pressure has a direct effect on the damping quantity, 5% decrease in produced pressure presents 5% increase in the air gap, so this method is an effective one in damping reduction. The diaphragm deflection diagram in Fig. 9 is presented to indicate the effect of air gap between the diaphragm and back plate. Increasing air gap will result in diaphragm deflection increase. In other word it is concluded that air gap increase causes the diaphragm to have a better response in the lower pressure. Fig. shows the diaphragm Von-Mises stress diagram. It is necessary to check Von-Mises stress of the plate against yield stress to avoid elasticity property reduction due to hardening phenomenon. The results indicated an increase in air gap between the diaphragm and back plate that will have a considerable effect on system response especially on reactive pressure on the back plate which directly results in diaphragm damping and deflection. To observe the back plate holes distance effect on creation pressure on the back plate and also diaphragm deflection, the diaphragm model has been analyzed in three different cases with 5 mm, 37mm, and 4mm, holes distance from the back plate center. With increasing the back plate holes distance, it is expected to have a pressure increase on the back plate due to the outgoing air flow reduction rate.
5 A. Ranjbar et al. / Journal of Mechanical Science and Technology 5 (3) () 65~6 69 deflection(m).e+ -.E-6 -.E-6-3.E-6-4.E-6 gap micron gap 3 gap 5 Pressure(Pas) rhole.6 rhole.5-5.e e radius Fig. 9. Air gap effects on diaphragm displacement Radius Fig.. the effect of number of holes on Diaphragm displacement..e-6.e+ -.E-6 Fig.. Air gap effects on Von-Mises tension in diaphragm. (a) (b) Fig.. Diaphragm displacement due to the different Back plate distance (a) 5mm; (b) 4mm. deflection(m) -.E-6-3.E-6-4.E-6-5.E-6-6.E-6 5.E-.E-.5E-.E-.5E- 3.E- 3.5E- 4.E- 4.5E- 5.E- radius 6 hole 8 hole 5.5E- 6.E- 6.5E- 7.E- 7.5E- 8.E- 8.5E- 9.E- 9.5E-.E+ Fig. 3. The curves for the pressure on the back plate for the 5mm and 6mm back plate holes radiuses. To show the diaphragm deflection in above three cases, the displacement contour is shown in Fig. (a), and Fig. (b) for the 5mm and 4mm hole distance models. The effect of fluid pressure increase on the diaphragm deflection reduction is clearly observed. It is worth to mention that on the above models, a little more pretension was applied to the diaphragm to reduce the diaphragm deflection due to the electrical charges. To consider the effect of increasing number of holes, a model with 8 holes arranging in two rows that each row have 4 holes with the 37mm distance from the diaphragm center for the first row and 47mm for the second row was analyzed. As shown in Fig., the displacement diagrams indicate a considerable diaphragm deflection effect for an increase in the number of holes. To determine the back plate holes radius size effect on the pressure gradient created on the back plate, the holes radius on the model with 4mm holes distance with respect to the diaphragm center was increased %. As mentioned before, this model showed a 5% increase in maximum pressure on the back plate with respect to the base model. Thus the holes radius was increased from 5mm to 6mm which resulted in 44% increase in each area of the holes. Fig. 3 shows the pressure curve on the back plate. Comparing the areas under the curves for the two cases, the damping due to the fluid pressure crea-
6 6 A. Ranjbar et al. / Journal of Mechanical Science and Technology 5 (3) () 65~6 Table. Base model dimensions. Parameters Symbols Parameters Quantities Diaphragm Radius R.75 (m) Back Plate Radius Rb.87 x Ro (m) Back plate hole radius r hole.5 (m) Back plate holes location rh.4 x Ro (m) Air gap thickness gap (micro meter) Initial tension σ.7 x 6 (pas) Number of holes N 6 percent increase in maximum pressure is resulted form 5- mm increase in back plate holes distance. Maximum pressure range experience considerable increase with increasing holes distance. Adding two more holes reduces maximum pressure from 3 Pa. to.66 Pa. in addition to considerable decreasing the maximum pressure range. Increasing the number of holes is the most effective method in reduction of fluid damping between the diaphragm and back plate. By increasing percent of back plate holes radius, the maximum pressure created on the back plate will decrease up to 5percent. Acknowledgment The authors would like to thank Dr. H. R. Hassani, the head of Electrical Engineering College of Shahed University, Dr. H. R. Massah, the head of the Acoustic Research Institute, and Dr. F. Mohseni sponsor of Acoustic Research Institute for their support and enthusiastic efforts to help our research goals. References tion could be determined for further necessary analyses. Displacement contours for the above cases are also shown in Fig Conclusion (a) (b) Fig. 4. Diaphragm displacement contour for the different holes radiuses (a) 5mm; (b) 6mm. In this paper a new model for condenser microphones has been introduced. Finite element method is used to obtain the design parameters of the microphone. ANSYS and CFX software has been used to solve the nonlinear fluid structure interaction of the microphone. The influence of microphone parameters on the response is investigated. Some of the results of the work can be indicated as: Increasing the air gap results in decreasing the pressure on the back plate and consequently causes diaphragm deflection to increase. If the effective tension on the diaphragm goes beyond the submission limit, it will cause the diaphragm elasticity to reduce. About 5-6 [] L. L. Beranek, Acoustics, Acoustical Society of America, New York (996). [] A. J. Zucherwar, Theoretical response of condenser microphones, J. Acoust. Soc. Am. 64 (5) (978) [3] R. Zhon, Analysis of the Acoustic Response of Circular condenser electert microphones, J. Acoust. Soc. Am., 69 (4) (98) -3. [4] A. Donk, P. R. Scheeper, W. Olthus and P. Bergveld, Modeling of silicon condenser microphones, Sensors and Actuators A, 4 (994) 3-6. [5] J. P. Mutschlecner and R. W. Whitaker, Design and operation of infrasonic microphones, Los Alamos National Laboratory (997). [6] M. Pedersen, W. Olthuis and P. Bergveld, High-Performance Condenser Microphone with Fully Integrated CMOS Amplifier and DC DC Voltage Converter, J. Microelectromechanical Sys., 7 (4) (998) [7] M. Ying, Q. Zou and S. Yi, Finite-element analysis of silicon condenser microphones with corrugated diaphragms, Finite Elements in Analysis and Design, 3 (998) [8] C. Rajalingham and R. B. Bhat, Influence of an electric field on diaphragms stability and vibration in a condenser microphone, J. Sound and Vibration, (5) ( 998) [9] W. Kainz, Condenser microphone model. Application of T-matrix method of Waterman to acoustic scattering from an elastic obstacle, J. Acoust. Soc. Am., 4 () ( 998) [] M. Dadic, Numerical determination of electric forces and capacitance of pressure condenser microphone, IEEE Instrumentation and Measurement technology conference (). [] J. Chen, Y. Hsu, S. Lee, T. Mukherjeea and G. K. Fedder, Modeling and simulation of a condenser microphone, Sensors and Actuators A, (8) 4-3. [] G. S. K. Wong and T. F. W. Embleton, AIP Handbook of
7 A. Ranjbar et al. / Journal of Mechanical Science and Technology 5 (3) () 65~6 6 Condenser Microphones: Theory, Calibration and Measurements, American Institute of Physics edition (994). [3] S. Timoshenko and S. Woinowsky-Krieger, Theory of plates and shells, McGraw-Hill Companies, second edition (959). Bashir Behjat entered the Mechanical Engineering program at the Amirkabir University of Technology. He received his bachelor s degree, along with a major degree in Solid Mechanics in 6. After getting as an honored student among the students of the faculty, Bashir Behjat was accepted into the master s program in the Mechanical Engineering department at Amirkabir University of Technology in 6. After accepting as a PhD student in Tabriz University in Iran in September 9, he continued his PhD in this university as a researcher in the field of Nonlinear Finite element method and FGPM Materials.
An Accurate Model for Pull-in Voltage of Circular Diaphragm Capacitive Micromachined Ultrasonic Transducers (CMUT)
An Accurate Model for Pull-in Voltage of Circular Diaphragm Capacitive Micromachined Ultrasonic Transducers (CMUT) Mosaddequr Rahman, Sazzadur Chowdhury Department of Electrical and Computer Engineering
More informationFinite Element Analysis of Piezoelectric Cantilever
Finite Element Analysis of Piezoelectric Cantilever Nitin N More Department of Mechanical Engineering K.L.E S College of Engineering and Technology, Belgaum, Karnataka, India. Abstract- Energy (or power)
More informationCHAPTER 4 DESIGN AND ANALYSIS OF CANTILEVER BEAM ELECTROSTATIC ACTUATORS
61 CHAPTER 4 DESIGN AND ANALYSIS OF CANTILEVER BEAM ELECTROSTATIC ACTUATORS 4.1 INTRODUCTION The analysis of cantilever beams of small dimensions taking into the effect of fringing fields is studied and
More informationPiezoelectric Control of Multi-functional Composite Shells Subjected to an Electromagnetic Field
Piezoelectric Control of Multi-functional Composite Shells Subjected to an Electromagnetic Field *Sang-Yun Park 1) and Ohseop Song 2) 1), 2) Department of Mechanical Engineering, Chungnam National University,
More informationExperimental Study and Analysis of Flow Induced Vibration in a pipeline
Experimental Study and Analysis of Flow Induced Vibration in a pipeline R.Veerapandi a G. Karthikeyan b Dr. G. R.Jinu c R. Kannaiah d a Final Year M.E(CAD),Regional Centre of Anna University,Tirunelveli-629004
More informationFINITE ELEMENT ANALYSIS OF ARKANSAS TEST SERIES PILE #2 USING OPENSEES (WITH LPILE COMPARISON)
FINITE ELEMENT ANALYSIS OF ARKANSAS TEST SERIES PILE #2 USING OPENSEES (WITH LPILE COMPARISON) Ahmed Elgamal and Jinchi Lu October 07 Introduction In this study, we conduct a finite element simulation
More informationParametric Study Of The Material On Mechanical Behavior Of Pressure Vessel
Parametric Study Of The Material On Mechanical Behavior Of Pressure Vessel Dr. Mohammad Tariq Assistant Professor Mechanical Engineering Department SSET, SHIATS-Deemed University, Naini, Allahabad, U.P.,
More informationFinite Element Analysis Lecture 1. Dr./ Ahmed Nagib
Finite Element Analysis Lecture 1 Dr./ Ahmed Nagib April 30, 2016 Research and Development Mathematical Model Mathematical Model Mathematical Model Finite Element Analysis The linear equation of motion
More informationStatic pressure and temperature coefficients of working standard microphones
Static pressure and temperature coefficients of working standard microphones Salvador BARRERA-FIGUEROA 1 ; Vicente CUTANDA-HENRÍQUEZ ; Antoni TORRAS-ROSELL 3 1,3 Danish Fundamental Metrology (DFM) A/S,
More informationExperimental and numerical investigation of modal properties for liquid-containing structures
Journal of Mechanical Science and Technology 6 (5) (0) 9~5 www.springerlink.com/content/738-9x DOI 0.007/s06-0-0336- Experimental and numerical investigation of modal properties for liquid-containing structures
More informationInvestigation of a nonlinear dynamic hydraulic system model through the energy analysis approach
Journal of Mechanical Science and Technology 3 (009) 973~979 Journal of Mechanical Science and Technology www.springerlink.com/content/1738-9x DOI.07/s6-009-081- Investigation of a nonlinear dynamic hydraulic
More informationVIBRATION ENERGY FLOW IN WELDED CONNECTION OF PLATES. 1. Introduction
ARCHIVES OF ACOUSTICS 31, 4 (Supplement), 53 58 (2006) VIBRATION ENERGY FLOW IN WELDED CONNECTION OF PLATES J. CIEŚLIK, W. BOCHNIAK AGH University of Science and Technology Department of Robotics and Mechatronics
More information1653. Effect of cut-out on modal properties of edge cracked temperature-dependent functionally graded plates
1653. Effect of cut-out on modal properties of edge cracked temperature-dependent functionally graded plates A. Shahrjerdi 1, T. Ezzati 2 1 Department of Mechanical Engineering, Malayer University, Malayer
More informationDYNAMIC ANALYSIS OF PILES IN SAND BASED ON SOIL-PILE INTERACTION
October 1-17,, Beijing, China DYNAMIC ANALYSIS OF PILES IN SAND BASED ON SOIL-PILE INTERACTION Mohammad M. Ahmadi 1 and Mahdi Ehsani 1 Assistant Professor, Dept. of Civil Engineering, Geotechnical Group,
More informationExpansion of circular tubes by rigid tubes as impact energy absorbers: experimental and theoretical investigation
Expansion of circular tubes by rigid tubes as impact energy absorbers: experimental and theoretical investigation M Shakeri, S Salehghaffari and R. Mirzaeifar Department of Mechanical Engineering, Amirkabir
More informationFinite Element Static, Vibration and Impact-Contact Analysis of Micromechanical Systems
Finite Element Static, Vibration and Impact-Contact Analysis of Micromechanical Systems Alexey I. Borovkov Eugeny V. Pereyaslavets Igor A. Artamonov Computational Mechanics Laboratory, St.Petersburg State
More informationDesign of a MEMS Capacitive Comb-drive Accelerometer
Design of a MEMS Capacitive Comb-drive Accelerometer Tolga Kaya* 1, Behrouz Shiari 2, Kevin Petsch 1 and David Yates 2 1 Central Michigan University, 2 University of Michigan * kaya2t@cmich.edu Abstract:
More informationMODELING SLAB-COLUMN CONNECTIONS REINFORCED WITH GFRP UNDER LOCALIZED IMPACT
MODELING SLAB-COLUMN CONNECTIONS REINFORCED WITH GFRP UNDER LOCALIZED IMPACT QI ZHANG and AMGAD HUSSEIN Faculty of Engineering, Memorial University of Newfoundland St. John s, Newfoundland, Canada, A1B
More informationUS06CPHY06 Instrumentation and Sensors UNIT 2 Part 2 Pressure Measurements
US06CPHY06 Instrumentation and Sensors UNIT 2 Part 2 Pressure Measurements Pressure Measurements What is Pressure? Pressure: Force exerted by a fluid on unit surface area of a container i.e. P = F/A. Units
More information1439. Numerical simulation of the magnetic field and electromagnetic vibration analysis of the AC permanent-magnet synchronous motor
1439. Numerical simulation of the magnetic field and electromagnetic vibration analysis of the AC permanent-magnet synchronous motor Bai-zhou Li 1, Yu Wang 2, Qi-chang Zhang 3 1, 2, 3 School of Mechanical
More informationAnalytical Strip Method for Thin Isotropic Cylindrical Shells
IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) e-issn: 2278-1684,p-ISSN: 2320-334X, Volume 14, Issue 4 Ver. III (Jul. Aug. 2017), PP 24-38 www.iosrjournals.org Analytical Strip Method for
More informationNatural vibration frequency of classic MEMS structures
Natural vibration frequency of classic MEMS structures Zacarias E. Fabrim PGCIMAT, UFRGS, Porto Alegre, RS, Brazil Wang Chong, Manoel Martín Pérez Reimbold DeTec, UNIJUI, Ijuí, RS, Brazil Abstract This
More informationFinite Element Analysis of Compression of Thin, High Modulus, Cylindrical Shells with Low-Modulus Core
Finite Element Analysis of Compression of Thin, High Modulus, Cylindrical Shells with Low-Modulus Core Robert S. Joseph Design Engineering Analysis Corporation, McMurray, PA ABSTRACT Long, cylindrical
More informationStructural Dynamics. Spring mass system. The spring force is given by and F(t) is the driving force. Start by applying Newton s second law (F=ma).
Structural Dynamics Spring mass system. The spring force is given by and F(t) is the driving force. Start by applying Newton s second law (F=ma). We will now look at free vibrations. Considering the free
More informationAbstract. 1 Introduction
A numerical approach for the free vibration of isotropic triangular plates J.P. Arenas Institute ofacoustics, Facultad de Ciencias de la Ingenieria, Universidad Austral de Chile, PO Box 567, Valdivia,
More informationActive Integral Vibration Control of Elastic Bodies
Applied and Computational Mechanics 2 (2008) 379 388 Active Integral Vibration Control of Elastic Bodies M. Smrž a,m.valášek a, a Faculty of Mechanical Engineering, CTU in Prague, Karlovo nam. 13, 121
More informationAnalytical Design of Micro Electro Mechanical Systems (MEMS) based Piezoelectric Accelerometer for high g acceleration
Analytical Design of Micro Electro Mechanical Systems (MEMS) based Piezoelectric Accelerometer for high g acceleration Arti Arora 1, Himanshu Monga 2, Anil Arora 3 Baddi University of Emerging Science
More informationDynamic Response Of Laminated Composite Shells Subjected To Impulsive Loads
IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) e-issn: 2278-1684,p-ISSN: 2320-334X, Volume 14, Issue 3 Ver. I (May. - June. 2017), PP 108-123 www.iosrjournals.org Dynamic Response Of Laminated
More informationVirtual Prototyping of Electrodynamic Loudspeakers by Utilizing a Finite Element Method
Virtual Prototyping of Electrodynamic Loudspeakers by Utilizing a Finite Element Method R. Lerch a, M. Kaltenbacher a and M. Meiler b a Univ. Erlangen-Nuremberg, Dept. of Sensor Technology, Paul-Gordan-Str.
More informationIntroduction to Continuous Systems. Continuous Systems. Strings, Torsional Rods and Beams.
Outline of Continuous Systems. Introduction to Continuous Systems. Continuous Systems. Strings, Torsional Rods and Beams. Vibrations of Flexible Strings. Torsional Vibration of Rods. Bernoulli-Euler Beams.
More informationLecture 10 Acoustics of Speech & Hearing HST 714J. Lecture 10: Lumped Acoustic Elements and Acoustic Circuits
Lecture 0: Lumped Acoustic Elements and Acoustic Circuits I. A Review of Some Acoustic Elements A. An open-ended tube or Acoustic mass: units of kg/m 4 p linear dimensions l and a
More informationAnalysis of asymmetric radial deformation in pipe with local wall thinning under internal pressure using strain energy method
Analysis of asymmetric radial deformation in pipe with local wall thinning under internal pressure using strain energy method V.M.F. Nascimento Departameto de ngenharia Mecânica TM, UFF, Rio de Janeiro
More information2766. Differential quadrature method (DQM) for studying initial imperfection effects and pre- and post-buckling vibration of plates
2766. Differential quadrature method (DQM) for studying initial imperfection effects and pre- and post-buckling vibration of plates Hesam Makvandi 1, Shapour Moradi 2, Davood Poorveis 3, Kourosh Heidari
More information142. Determination of reduced mass and stiffness of flexural vibrating cantilever beam
142. Determination of reduced mass and stiffness of flexural vibrating cantilever beam Tamerlan Omarov 1, Kuralay Tulegenova 2, Yerulan Bekenov 3, Gulnara Abdraimova 4, Algazy Zhauyt 5, Muslimzhan Ibadullayev
More informationRobust shaft design to compensate deformation in the hub press fitting and disk clamping process of 2.5 HDDs
DOI 10.1007/s00542-016-2850-2 TECHNICAL PAPER Robust shaft design to compensate deformation in the hub press fitting and disk clamping process of 2.5 HDDs Bumcho Kim 1,2 Minho Lee 3 Gunhee Jang 3 Received:
More informationDrop Test Simulation of a BGA Package: Methods & Experimental Comparison
Drop Test Simulation of a BGA Package: Methods & Experimental Comparison Chris Cowan, Ozen Engineering, Inc. Harvey Tran, Intel Corporation Nghia Le, Intel Corporation Metin Ozen, Ozen Engineering, Inc.
More informationEffect of Specimen Dimensions on Flexural Modulus in a 3-Point Bending Test
Effect of Specimen Dimensions on Flexural Modulus in a 3-Point Bending Test M. Praveen Kumar 1 and V. Balakrishna Murthy 2* 1 Mechanical Engineering Department, P.V.P. Siddhartha Institute of Technology,
More informationDYNAMIC CHARACTERISTICS OF A PARTIALLY FLUID- FILLED CYLINDRICAL SHELL
DOI: 10.5516/NET.2011.43.2.167 DYNAMIC CHARACTERISTICS OF A PARTIALLY FLUID- FILLED CYLINDRICAL SHELL MYUNG JO JHUNG *1, SEON OH YU 1, and YEONG TAEK LIM 2 1 Safety Research Division, Korea Institute of
More informationBENCHMARK LINEAR FINITE ELEMENT ANALYSIS OF LATERALLY LOADED SINGLE PILE USING OPENSEES & COMPARISON WITH ANALYTICAL SOLUTION
BENCHMARK LINEAR FINITE ELEMENT ANALYSIS OF LATERALLY LOADED SINGLE PILE USING OPENSEES & COMPARISON WITH ANALYTICAL SOLUTION Ahmed Elgamal and Jinchi Lu October 07 Introduction In this study: I) The response
More informationDynamic Analysis on Vibration Isolation of Hypersonic Vehicle Internal Systems
International Journal of Engineering Research and Technology. ISSN 0974-3154 Volume 6, Number 1 (2013), pp. 55-60 International Research Publication House http://www.irphouse.com Dynamic Analysis on Vibration
More informationInternational Journal of Scientific & Engineering Research, Volume 5, Issue 7, July-2014 ISSN
ISSN 2229-5518 692 In literature, finite element formulation uses beam element or plate element for structural modelling which has a limitation on transverse displacement. Atkinson and Manrique [1] studied
More informationME 237: Mechanics of Microsystems : Lecture. Modeling Squeeze Film Effects in MEMS
ME 237: Mechanics of Microsystems : Lecture Squeeze Film Effects in MEMS Anish Roychowdhury Adviser : Prof Rudra Pratap Department of Mechanical Engineering and Centre for Nano Science and Engineering
More informationMobility and Impedance Methods. Professor Mike Brennan
Mobility and Impedance Methods Professor Mike Brennan ibration control ibration Problem Understand problem Modelling (Mobility and Impedance Methods) Solve Problem Measurement Mobility and Impedance The
More informationCOPYRIGHTED MATERIAL. Index
Index A Admissible function, 163 Amplification factor, 36 Amplitude, 1, 22 Amplitude-modulated carrier, 630 Amplitude ratio, 36 Antinodes, 612 Approximate analytical methods, 647 Assumed modes method,
More informationEVALUATING DYNAMIC STRESSES OF A PIPELINE
EVALUATING DYNAMIC STRESSES OF A PIPELINE by K.T. TRUONG Member ASME Mechanical & Piping Division THE ULTRAGEN GROUP LTD 2255 Rue De La Province Longueuil (Quebec) J4G 1G3 This document is provided to
More informationEE 5344 Introduction to MEMS CHAPTER 6 Mechanical Sensors. 1. Position Displacement x, θ 2. Velocity, speed Kinematic
I. Mechanical Measurands: 1. Classification of main types: EE 5344 Introduction MEMS CHAPTER 6 Mechanical Sensors 1. Position Displacement x, θ. Velocity, speed Kinematic dx dθ v =, = ω 3. Acceleration
More informationMicrostructure cantilever beam for current measurement
264 South African Journal of Science 105 July/August 2009 Research Articles Microstructure cantilever beam for current measurement HAB Mustafa and MTE Khan* Most microelectromechanical systems (MEMS) sensors
More informationThe Corrected Expressions for the Four-Pole Transmission Matrix for a Duct with a Linear Temperature Gradient and an Exponential Temperature Profile
Open Journal of Acoustics, 03, 3, 6-66 http://dx.doi.org/0.436/oja.03.3300 Published Online September 03 (http://www.scirp.org/journal/oja) he Corrected Expressions for the Four-Pole ransmission Matrix
More informationModeling and Design of MEMS Accelerometer to detect vibrations on chest wall
Modeling and Design of MEMS Accelerometer to detect vibrations on chest wall P. Georgia Chris Selwyna 1, J.Samson Isaac 2 1 M.Tech Biomedical Instrumentation, Department of EIE, Karunya University, Coimbatore
More informationFree vibration analysis of thin circular and annular plate with general boundary conditions
Engineering Solid Mechanics 3 (2015) 245-252 Contents lists available at GrowingScience Engineering Solid Mechanics homepage: www.growingscience.com/esm Free vibration analysis of thin circular and annular
More informationThe student will experimentally determine the parameters to represent the behavior of a damped oscillatory system of one degree of freedom.
Practice 3 NAME STUDENT ID LAB GROUP PROFESSOR INSTRUCTOR Vibrations of systems of one degree of freedom with damping QUIZ 10% PARTICIPATION & PRESENTATION 5% INVESTIGATION 10% DESIGN PROBLEM 15% CALCULATIONS
More informationJumper Analysis with Interacting Internal Two-phase Flow
Jumper Analysis with Interacting Internal Two-phase Flow Leonardo Chica University of Houston College of Technology Mechanical Engineering Technology March 20, 2012 Overview Problem Definition Jumper Purpose
More information440. Simulation and implementation of a piezoelectric sensor for harmonic in-situ strain monitoring
440. Simulation and implementation of a piezoelectric sensor for harmonic in-situ strain monitoring 0. Incandela a, L. Goujon b, C. Barthod c University of Savoie, BP 80439 Annecy-le-Vieux CEDEX, France
More informationStrain Measurements. Isaac Choutapalli
Note that for axial elongation (Eaxiai > 0), Erransverse (from Equation C.6), and therefore Strain Measurements Isaac Choutapalli Department of Mechanical Engineering The University of Texas - Pan American
More informationChapter 5. Vibration Analysis. Workbench - Mechanical Introduction ANSYS, Inc. Proprietary 2009 ANSYS, Inc. All rights reserved.
Workbench - Mechanical Introduction 12.0 Chapter 5 Vibration Analysis 5-1 Chapter Overview In this chapter, performing free vibration analyses in Simulation will be covered. In Simulation, performing a
More informationVibro-Impact Dynamics of a Piezoelectric Energy Harvester
Proceedings of the IMAC-XXVIII February 1 4, 1, Jacksonville, Florida USA 1 Society for Experimental Mechanics Inc. Vibro-Impact Dynamics of a Piezoelectric Energy Harvester K.H. Mak *, S. McWilliam, A.A.
More informationTransmission Matrix Model of a Quarter-Wave-Tube with Gas Temperature Gradients
Transmission Matrix Model of a Quarter-Wave-Tube with Gas Temperature Gradients Carl Howard School of Mechanical Engineering, University of Adelaide, South Australia, Australia ABSTRACT A transmission
More informationPerformance Evaluation of MEMS Based Capacitive Pressure Sensor for Hearing Aid Application
International Journal of Advanced Engineering Research and Science (IJAERS) 215] [Vol-2, Issue-4, April- Performance Evaluation of MEMS Based Capacitive Pressure Sensor for Hearing Aid Application Apoorva
More informationOn The Finite Element Modeling Of Turbo Machinery Rotors In Rotor Dynamic Analysis
Proceedings of The Canadian Society for Mechanical Engineering International Congress 2018 CSME International Congress 2018 May 27-30, 2018, Toronto, On, Canada On The Finite Element Modeling Of Turbo
More informationHydroelastic vibration of a rectangular perforated plate with a simply supported boundary condition
Fluid Structure Interaction and Moving Boundary Problems IV 63 Hydroelastic vibration of a rectangular perforated plate with a simply supported boundary condition K.-H. Jeong, G.-M. Lee, T.-W. Kim & J.-I.
More informationDSC HW 3: Assigned 6/25/11, Due 7/2/12 Page 1
DSC HW 3: Assigned 6/25/11, Due 7/2/12 Page 1 Problem 1 (Motor-Fan): A motor and fan are to be connected as shown in Figure 1. The torque-speed characteristics of the motor and fan are plotted on the same
More informationSound Radiation Of Cast Iron
Purdue University Purdue e-pubs International Compressor Engineering Conference School of Mechanical Engineering 2002 Sound Radiation Of Cast Iron N. I. Dreiman Tecumseh Products Company Follow this and
More informationEE C245 / ME C218 INTRODUCTION TO MEMS DESIGN FALL 2009 PROBLEM SET #7. Due (at 7 p.m.): Thursday, Dec. 10, 2009, in the EE C245 HW box in 240 Cory.
Issued: Thursday, Nov. 24, 2009 PROBLEM SET #7 Due (at 7 p.m.): Thursday, Dec. 10, 2009, in the EE C245 HW box in 240 Cory. 1. Gyroscopes are inertial sensors that measure rotation rate, which is an extremely
More informationHEALTH MONITORING OF PLATE STRUCTURE USING PIEZO ELECTRIC PATCHES AND CURVATURE MODE SHAPE
ISSN (Online) : 2319-8753 ISSN (Print) : 2347-6710 International Journal of Innovative Research in Science, Engineering and Technology An ISO 3297: 2007 Certified Organization, Volume 2, Special Issue
More informationComputational Simulation of Dynamic Response of Vehicle Tatra T815 and the Ground
IOP Conference Series: Earth and Environmental Science PAPER OPEN ACCESS Computational Simulation of Dynamic Response of Vehicle Tatra T815 and the Ground To cite this article: Jozef Vlek and Veronika
More informationVIBRATION CONTROL OF RECTANGULAR CROSS-PLY FRP PLATES USING PZT MATERIALS
Journal of Engineering Science and Technology Vol. 12, No. 12 (217) 3398-3411 School of Engineering, Taylor s University VIBRATION CONTROL OF RECTANGULAR CROSS-PLY FRP PLATES USING PZT MATERIALS DILEEP
More informationThe sound generated by a transverse impact of a ball on a circular
J. Acoust. Soc. Jpn. (E) 1, 2 (1980) The sound generated by a transverse impact of a ball on a circular plate Toshio Takahagi*, Masayuki Yokoi*, and Mikio Nakai** *Junior College of Osaka Industrial University,
More informationTransmission Matrix Model of a Quarter-Wave-Tube with Gas Temperature Gradients
Proceedings of Acoustics 2013 Victor Harbor Transmission Matrix Model of a Quarter-Wave-Tube with Gas Temperature Gradients Carl Howard School of Mechanical Engineering, University of Adelaide, South Australia,
More informationElectromagnetic Forming Process Analysis Based on Coupled Simulations of Electromagnetic Analysis and Structural Analysis
Journal of Magnetics 21(2), 215-221 (2016) ISSN (Print) 1226-1750 ISSN (Online) 2233-6656 http://dx.doi.org/10.4283/jmag.2016.21.2.215 Electromagnetic Forming Process Analysis Based on Coupled Simulations
More informationIraq Ref. & Air. Cond. Dept/ Technical College / Kirkuk
International Journal of Scientific & Engineering Research, Volume 6, Issue 4, April-015 1678 Study the Increasing of the Cantilever Plate Stiffness by Using s Jawdat Ali Yakoob Iesam Jondi Hasan Ass.
More informationFREE VIBRATION ANALYSIS OF THIN CYLINDRICAL SHELLS SUBJECTED TO INTERNAL PRESSURE AND FINITE ELEMENT ANALYSIS
FREE VIBRATION ANALYSIS OF THIN CYLINDRICAL SHELLS SUBJECTED TO INTERNAL PRESSURE AND FINITE ELEMENT ANALYSIS J. Kandasamy 1, M. Madhavi 2, N. Haritha 3 1 Corresponding author Department of Mechanical
More informationBending of Simply Supported Isotropic and Composite Laminate Plates
Bending of Simply Supported Isotropic and Composite Laminate Plates Ernesto Gutierrez-Miravete 1 Isotropic Plates Consider simply a supported rectangular plate of isotropic material (length a, width b,
More informationStudy and design of a composite acoustic sensor to characterize an heterogeneous media presenting a complex matrix
19 th INTERNATIONAL CONGRESS ON ACOUSTICS MADRID, -7 SEPTEMBER 007 Study and design of a composite acoustic sensor to characterize an heterogeneous media presenting a complex matrix PACS: 43.58.-e Georges,
More informationExperimental Modal Analysis of a Flat Plate Subjected To Vibration
American Journal of Engineering Research (AJER) 2016 American Journal of Engineering Research (AJER) e-issn: 2320-0847 p-issn : 2320-0936 Volume-5, Issue-6, pp-30-37 www.ajer.org Research Paper Open Access
More informationINTERNATIONAL JOURNAL OF CIVIL AND STRUCTURAL ENGINEERING Volume 3, No 4, 2013
INTERNATIONAL JOURNAL OF CIVIL AND STRUCTURAL ENGINEERING Volume 3, No 4, 2013 Copyright by the authors - Licensee IPA- Under Creative Commons license 3.0 Research article ISSN 0976 4399 Pure bending analysis
More informationThe Finite Element Analysis Of Shells - Fundamentals (Computational Fluid And Solid Mechanics) By Klaus-Jurgen Bathe, Dominique Chapelle
The Finite Element Analysis Of Shells - Fundamentals (Computational Fluid And Solid Mechanics) By Klaus-Jurgen Bathe, Dominique Chapelle The Finite Element Analysis of Shells Fundamentals. Computational
More informationThe University of Melbourne Engineering Mechanics
The University of Melbourne 436-291 Engineering Mechanics Tutorial Four Poisson s Ratio and Axial Loading Part A (Introductory) 1. (Problem 9-22 from Hibbeler - Statics and Mechanics of Materials) A short
More informationD && 9.0 DYNAMIC ANALYSIS
9.0 DYNAMIC ANALYSIS Introduction When a structure has a loading which varies with time, it is reasonable to assume its response will also vary with time. In such cases, a dynamic analysis may have to
More informationStatic & Dynamic. Analysis of Structures. Edward L.Wilson. University of California, Berkeley. Fourth Edition. Professor Emeritus of Civil Engineering
Static & Dynamic Analysis of Structures A Physical Approach With Emphasis on Earthquake Engineering Edward LWilson Professor Emeritus of Civil Engineering University of California, Berkeley Fourth Edition
More informationVIBRATION ANALYSIS OF AN AUTOMOTIVE SILENCER
VIBRATION ANALYSIS OF AN AUTOMOTIVE SILENCER K. R. Gadre PG Student, Department Mechanical Engg., Sinhgad College of Engineering, Pune T. A. Jadhav Associate Professor, Department Mechanical Engg, Sinhgad
More informationLoad Cell Design Using COMSOL Multiphysics
Load Cell Design Using COMSOL Multiphysics Andrei Marchidan, Tarah N. Sullivan and Joseph L. Palladino Department of Engineering, Trinity College, Hartford, CT 06106, USA joseph.palladino@trincoll.edu
More informationSome Aspects Of Dynamic Buckling of Plates Under In Plane Pulse Loading
Mechanics and Mechanical Engineering Vol. 12, No. 2 (2008) 135 146 c Technical University of Lodz Some Aspects Of Dynamic Buckling of Plates Under In Plane Pulse Loading Katarzyna Kowal Michalska, Rados
More informationModeling of Pantograph-Catenary dynamic stability
Technical Journal of Engineering and Applied Sciences Available online at www.tjeas.com 2013 TJEAS Journal-2013-3-14/1486-1491 ISSN 2051-0853 2013 TJEAS Modeling of Pantograph-Catenary dynamic stability
More informationDesign of a hydrostatic symmetric-pad bearing with the membrane-type restrictor
Design of a hydrostatic symmetric-pad bearing with the membrane-type restrictor Professor: Shih-Chieh Lin Manufacturing and Production System Lab Dept. of Power Mechanical Engineering, National Tsing Hua
More informationThermal deformation compensation of a composite beam using piezoelectric actuators
INSTITUTE OF PHYSICS PUBLISHING Smart Mater. Struct. 13 (24) 3 37 SMART MATERIALS AND STRUCTURES PII: S964-1726(4)7973-8 Thermal deformation compensation of a composite beam using piezoelectric actuators
More informationSimulation and Experimental Characterizations of a Thin Touch Mode Capacitive Pressure Sensor
Simulation and Experimental Characterizations of a Thin Touch Mode Capacitive Pressure Sensor A.M. El Guamra 1, D. Bühlmann 1, F. Moreillon 1, L. Vansteenkiste 1, P. Büchler 2, A. Stahel 3, P. Passeraub
More informationUNLOADING OF AN ELASTIC-PLASTIC LOADED SPHERICAL CONTACT
2004 AIMETA International Tribology Conference, September 14-17, 2004, Rome, Italy UNLOADING OF AN ELASTIC-PLASTIC LOADED SPHERICAL CONTACT Yuri KLIGERMAN( ), Yuri Kadin( ), Izhak ETSION( ) Faculty of
More informationMeasurement Techniques for Engineers. Motion and Vibration Measurement
Measurement Techniques for Engineers Motion and Vibration Measurement Introduction Quantities that may need to be measured are velocity, acceleration and vibration amplitude Quantities useful in predicting
More informationGrade XI. Physics Exam Preparation Booklet. Chapter-wise Important Questions. #GrowWithGreen
Grade XI Physics Exam Preparation Booklet Chapter-wise Important Questions #GrowWithGreen Units and Measurements Q1. After reading the physics book, Anamika recalled and noted down the expression for the
More informationGeneral elastic beam with an elastic foundation
General elastic beam with an elastic foundation Figure 1 shows a beam-column on an elastic foundation. The beam is connected to a continuous series of foundation springs. The other end of the foundation
More informationCHAPTER THREE SYMMETRIC BENDING OF CIRCLE PLATES
CHAPTER THREE SYMMETRIC BENDING OF CIRCLE PLATES * Governing equations in beam and plate bending ** Solution by superposition 1.1 From Beam Bending to Plate Bending 1.2 Governing Equations For Symmetric
More informationFinite Element Analysis of Dynamic Properties of Thermally Optimal Two-phase Composite Structure
Vibrations in Physical Systems Vol.26 (2014) Finite Element Analysis of Dynamic Properties of Thermally Optimal Two-phase Composite Structure Abstract Maria NIENARTOWICZ Institute of Applied Mechanics,
More informationDYNAMIC RESPONSE OF THIN-WALLED GIRDERS SUBJECTED TO COMBINED LOAD
DYNAMIC RESPONSE OF THIN-WALLED GIRDERS SUBJECTED TO COMBINED LOAD P. WŁUKA, M. URBANIAK, T. KUBIAK Department of Strength of Materials, Lodz University of Technology, Stefanowskiego 1/15, 90-924 Łódź,
More informationDynamics of Rotor Systems with Clearance and Weak Pedestals in Full Contact
Paper ID No: 23 Dynamics of Rotor Systems with Clearance and Weak Pedestals in Full Contact Dr. Magnus Karlberg 1, Dr. Martin Karlsson 2, Prof. Lennart Karlsson 3 and Ass. Prof. Mats Näsström 4 1 Department
More informationVIBRATION ANALYSIS OF TIE-ROD/TIE-BOLT ROTORS USING FEM
VIBRATION ANALYSIS OF TIE-ROD/TIE-BOLT ROTORS USING FEM J. E. Jam, F. Meisami Composite Materials and Technology Center Tehran, IRAN jejaam@gmail.com N. G. Nia Iran Polymer & Petrochemical Institute, Tehran,
More informationThe acoustic characterization of porous media and its standards
The acoustic characterization of porous media and its standards Luc JAOUEN 1, François-Xavier BECOT, Fabien CHEVILLOTTE Matelys, France ABSTRACT While there is a growing number of methods for the acoustic
More informationStructural Acoustics Applications of the BEM and the FEM
Structural Acoustics Applications of the BEM and the FEM A. F. Seybert, T. W. Wu and W. L. Li Department of Mechanical Engineering, University of Kentucky Lexington, KY 40506-0046 U.S.A. SUMMARY In this
More informationVibration analysis of circular arch element using curvature
Shock and Vibration 15 (28) 481 492 481 IOS Press Vibration analysis of circular arch element using curvature H. Saffari a,. Tabatabaei a, and S.H. Mansouri b a Civil Engineering Department, University
More informationInternal Exam Marks. Marks
Course Name : 03 Years Diploma in Engineering Semester : First Subject Title : Engineering Physics-I Subject Code : 103/ 107 Teaching and Examination Scheme: Teaching Scheme L T P Full External. Exam Internal
More informationDue Date 1 (for confirmation of final grade): Monday May 10 at 11:59pm Due Date 2 (absolute latest possible submission): Friday May 14 at 5pm
! ME345 Modeling and Simulation, Spring 2010 Case Study 3 Assigned: Friday April 16! Due Date 1 (for email confirmation of final grade): Monday May 10 at 11:59pm Due Date 2 (absolute latest possible submission):
More information