Development of a Rubber for a Tuned Mass Damper for Rail Vibration
|
|
- Jesse Ramsey
- 6 years ago
- Views:
Transcription
1 Development of a Rubber for a Tuned Mass Damper for Rail Vibration A H Muhr For RIEG Discussion Meeting on Vibration Control with Elastomer Products DTR VMS, Trowbridge, 6 th June 2014 Based on PhD thesis of Nazirah Ahmad, co-supervised by David Thompson, ISVR, and Alan Muhr, TARRC Acknowledgments due also to Chris Jones (ISVR), Hamid Ahmadi & Judith Picken (TARRC) 1
2 Damping Vibration isolation 2
3 Muhr
4 Vibration absorber (Den Hartog, 1928) p a = k m c2 μ = 2m p 0 and - measure of the damping of the absorber For a given mass ratio β = infinite resonance peak at ω = p 0 = k1 m 1, optimum values of to two resonances, one at a higher frequency and one at a lower, each of height - nominal natural angular frequencies of absorber and main system m m 2 1 p 0 p p a 0 x1 P/k 1 and µ reduce the 2 + β = β 4
5 Absorber splits the single natural resonance into two, and damps both. The bigger its mass, the lower the peaks, and the wider the split. Optimisation achieved by choice of absorber frequency to give equal ordinates at S & T, and choice of absorber damping to make one or other of S & T a maximum wrt ω [Timoshenko, Young & Weaver, 1974, pp ] 5
6 6 Typical noise spectrum showing wheel, rail and sleeper noise components calculated using TWINS (Thompson et al., 1996)
7 Original prototype current product is bigger top mass thickness 1 thickness 2 visco-elastic material bottom mass A 2DOF tuned mass damper for rail web and foot was designed and tested in a collaboration between ISVR and Corus, and based on a castable PU after assessing 47 7 different polymers
8 The tuned mass damper attenuates propagation of flexural waves NOT a resonant vibration mode 8
9 Flexural waves in untreated rail (a) decay weakly with distance travelled SDOF Mass Absorbers, shown in (b), enhance the amplitude decay rate of flexural waves 9
10 Onset of flexural wave propagation decay rate of untreated ( ) and treated ( ) track (SDOF 10 dampers)
11 Effects on decay rate rail pad stiffness, no absorber rail pad stiffness, with absorber absorber stiffness absorber loss factor 11
12 Tests showed that it worked Measurement of total rolling noise at 100 km/h with and without rail absorbers Influence of wheel noise minimized by using a vehicle fitted with noise-reducing wheels. Average from three microphones at 3 m from near rail (Thompson et al., 2007) 12
13 But will it work at all temperatures? The temperature of rails in sunlight may differ from air temperature Rail temperature data is rare but exists for a site in Leominster Map data 2014 Google 13
14 temperature of rails in sunlight may differ from air temperature Air versus rail temperature for a Leominster site, UK. Data obtained at minutes intervals from 1 st Feb to 30 th Nov [Chapman et al; 2008]
15 Objective of Nazirah s project: could optimisation of properties of the viscoelastic material reduce the noise further? DESIGN BRIEF: For -20 T 40 C, 1000Hz E = 14 MPa, 0.35 tan δ Cost of installed product to be minimised Longevity in the environment to be maximised MODIFIED DESIGN BRIEF: For -20 T 40 C, 300 freq 3000Hz 1.7 G / 8.3 MPa, 0.25 tan δ 15
16 Here and Next 3 slides give literature data at 500 or 1000Hz, T= -20, 0, 20 & 40 C for 33 polymers 16
17 17
18 18
19 Best materials at start of project Nitrile blend Nazirah Ahmad MSc thesis PU, prior art for rail absorber 19
20 First, try linear viscoelastic (ie obeying Boltzmann s superposition principle) and thermorheologically simple (ie conforming to temperature-rate equivalence, as described by WLF) materials: Assume tanδ is constant over the specified temperature range T 1 T T 2 storage shear modulus G / depends on T according to: log 10 G ( T G ( T 1 2 ) ) 2 tanδ π 8.86( T2 Ts ) T2 T s 8.86( T1 Ts ) T T 1 s 20
21 4 tanδ = 0.2 tanδ = 0.35 tanδ = log 10 (G'(T 1 )/G'(T 2 )) T s / C 0 NR, IIR Ratio of G / at specified temperature extremes T 1 = -20 C, T 2 = 40 C as a function of choice of T s and tan δ 21
22 Ratio of G / plotted against temperature for T s = 20 C, normalised at 10 C. The curves represent values of tan δ = 0.05, 0.1., 0.2, 0.4 &
23 ISVR technique for dynamic properties Reasonably free of artefacts for 300 < freq < 3000Hz large seismic mass on soft rubber mounts thin pads for soft rubber to avoid wave effects at high freq, thicker for stiff rubber [eg at low temp] to avoid artefacts at low frequencies Stiff steel yoke Excitation from electrodynamic shaker c d Samples of resilient material (2 each side) Bolt for applying compression Piezoelectric force transducer Accelerometer High impedance foundation (large steel block) 23
24 24 effect of adding filler to butyl rubber at 1 khz. ( ) unfilled ( ) 40 pphr carbon black
25 25 Results for EPDM + black + oil at 1 khz. Because tanδ is lower, the variation of modulus with temperature is also lower.
26 The 2DOF damper has been installed on 160km of trackwork distributed in 16 countries See sustainable_expansion_of_rail_networks.page based on the original PU, not Nazirah Ahmad s materials 26
27 Conclusions railway rolling noise dominated by sleepers up to 400Hz rail for 400 to 1500Hz wheels at higher frequency noise is radiated from both lateral and vertical motion of the rail vertical contribution is more important Vibration absorbers are effective against both rail contributions require high tanδ and minimal frequency and temperature sensitivity of stiffness polymer science + high tanδ high frequency and temperature sensitivity of G / We have sought a best compromise by choosing a low T g (and hence T s ), fine tuning with plasticiser incorporating filler optimising choice for actual rail temperature range by using average noise reduction, weighted by frequency of occurrence of 27 temperature bands
28 References Ahmad N, Thompson D J, Jones C F C, Muhr A H 2009 Predicting the effect of T on the performance of elastomer-based rail damping devices J Sound & Vibration Research, 322, Chapman L T, Thornes J E, Huang Y, Cai X, Sanderson V L & White S P (2008) Modelling of rail surface temperatures Theoretical & Applied Climatology, 92, Muhr A H 1992 A comparison of rubber and metal springs for vibration isolation Plastics, Rubber & Composites, 18, 3-7 Thompson D J, Hemsworth B & Vincent N, 1996 Experimental validation of the Track-Wheel Interaction Noise Software prediction program for rolling noise I: Description of the model and method, J Sound & Vibration, 193, Thompson D J, Jones C J, Waters T P & Farrington D 2007, A tuned damping device for reducing noise from raliway track, Applied Acoustics 678, 3 57 Thompson D J 2008 Railway Noise and Vibration publ Elsevier Timoshenko S P, Young D H & Weaver W, 1974, Vibration Problems in Engineering,4 th Edition, publ Wiley, New York, pp (not included in 5 th Edition, 1990) 28
29 More Vibration Absorber refs: C.M. Harris, 1987, Shock and Vibration Handbook, Third Edition, McGraw Hill. R.G. White and J.G. Walker, 1982, Noise and Vibration, Ellis Horwood Publishers. J.P. Den Hartog, Mechanical Vibrations, Second Edition.Dover Publications S.S. Rao, 2003, Mechanical Vibrations, Fourth Edition, Prentice Hall. Snowden JC 1968 [Ch 4 ] Vibration & Shock in Damped Mechanical Systems, publ Wiley 29
EVALUATION OF THE EFFECTS OF TEMPERATURE ON RAILPAD PROPERTIES, RAIL DECAY RATES AND NOISE RADIATION
EVALUATION OF THE EFFECTS OF TEMPERATURE ON RAILPAD PROPERTIES, RAIL DECAY RATES AND NOISE RADIATION R. A. Broadbent, D. J. Thompson and C. J. C. Jones ISVR, University of Southampton, Southampton, SO7
More informationMSE 383, Unit 3-3. Joshua U. Otaigbe Iowa State University Materials Science & Engineering Dept.
Dynamic Mechanical Behavior MSE 383, Unit 3-3 Joshua U. Otaigbe Iowa State University Materials Science & Engineering Dept. Scope Why DMA & TTS? DMA Dynamic Mechanical Behavior (DMA) Superposition Principles
More informationRolf Diehl, Reinhard Gorlich and Georg Holzl 2 1 Introduction In the speed range from about 60 to about 250 km/h rolling noise is the dominant noise f
Rolf Diehl, Reinhard Gorlich and Georg Holzl 1 Acoustic Optimisation of Railroad Track Using Computer Aided Methods Rolf Diehl and Reinhard Gorlich Muller{BBM GmbH, D{82152 Planegg, Robert-Koch-Str. 11
More informationDYNAMIC PROPERTIES OF EPOXIDISED NATURAL RUBBER
DYNAMIC PROPERTIES OF EPOXIDISED NATURAL RUBBER Mahmud Iskandar Seth A Rahim, Kirill Horoshenkov and Jem Rongong Department of Mechanical Engineering, The University of Sheffield, Velocity House, Sheffield,
More information10 Measurement of Acceleration, Vibration and Shock Transducers
Chapter 10: Acceleration, Vibration and Shock Measurement Dr. Lufti Al-Sharif (Revision 1.0, 25/5/2008) 1. Introduction This chapter examines the measurement of acceleration, vibration and shock. It starts
More informationIdentification of the rail radiation using beamforming and a 2 D array
Proceedings of the Acoustics 2012 Nantes Conference 23-27 April 2012, Nantes, France Identification of the rail radiation using beamforming and a 2 D array F. Le Courtois a, J.-H. Thomas b, F. Poisson
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 informationGeneration and Propagation of vibrations induced by high-speed railways
Generation and Propagation of vibrations induced by high-speed railways João Manso Abstract In the years to come, Portugal has several challenges to overcome and one is to try to modernize its train network.
More informationNOISE & VIBRATION MITIGATION IN RAILWAY TRACK
NOISE & VIBRATION MITIGATION IN RAILWAY TRACK Coenraad Esveld Esveld Consulting Services Emeritus Professor of Railway Engineering TU Delft 1 Noise: Rolling; Engines; Curves; Braking; Aerodynamics. Vibration:
More informationThis document is a preview generated by EVS
INTERNATIONAL STANDARD ISO 18437-1 First edition 2012-08-15 Mechanical vibration and shock Characterization of the dynamic mechanical properties of visco-elastic materials Part 1: Principles and guidelines
More informationCritical loss factor in 2-DOF in-series system with hysteretic friction and its use for vibration control
Critical loss factor in -DOF in-series system with hysteretic friction and its use for vibration control Roman Vinokur Acvibrela, Woodland Hills, CA Email: romanv99@aol.com Although the classical theory
More informationOPTI 521, Optomechanical Design, Technical Paper Reviews, Dr. Jim Burge, 2011
Synopsis of Predicting the vibration characteristics of elements incorporating Incompressible and Compressible Viscoelastic Materials Abstract Jacob Etter OPTI 521, University of Arizona, College of Optical
More informationComparison between the visco-elastic dampers And Magnetorheological dampers and study the Effect of temperature on the damping properties
Comparison between the visco-elastic dampers And Magnetorheological dampers and study the Effect of temperature on the damping properties A.Q. Bhatti National University of Sciences and Technology (NUST),
More informationVibration analysis of concrete bridges during a train pass-by using various models
Journal of Physics: Conference Series PAPER OPEN ACCESS Vibration analysis of concrete bridges during a train pass-by using various models To cite this article: Qi Li et al 2016 J. Phys.: Conf. Ser. 744
More informationExperimental validation of a numerical model for the ground vibration from trains in tunnels
Experimental validation of a numerical model for the ground vibration from trains in tunnels Qiyun Jin; David Thompson; Daniel Lurcock; Martin Toward; Evangelos Ntotsios; Samuel Koroma Institute of Sound
More informationVibration Analysis of a Horizontal Washing Machine, Part IV: Optimal Damped Vibration Absorber
RESEARCH ARTICLE Vibration Analysis of a Horizontal Washing Machine, Part IV: Optimal Damped Vibration Absorber Galal Ali Hassaan Department of Mechanical Design & Production, Faculty of Engineering, Cairo
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 informationCE210 January 3:0 Structural Dynamics
Announcements CE210 January 3:0 Structural Dynamics Instructor C S Manohar Email: manohar@iisc.ac.in Teaching Assistant K Karuna Email: karuna@iisc.ac.in Department: Civil Engineering Course Time: MWF
More informationDynamic Measurement of Engine Mount Properties Using Hysteresis Loop Method
Dynamic Measurement of Engine Mount Properties Using Hysteresis Loop Method Iskandazaqwan Zikrullah Zainudin School of Mechanical Engineering, Universiti Sains Malaysia, Penang, MALAYSIA Hasratul Azwan
More informationPrediction of rail and bridge noise from concrete railway viaducts using a. multi-layer rail fastener model and a wavenumber domain method
Paper accepted for publication by Journal of Rail and Rapid Transit, 18 June 2017 Prediction of rail and bridge noise from concrete railway viaducts using a multi-layer rail fastener model and a wavenumber
More informationDynamic characterization of engine mount at different orientation using sine swept frequency test
Dynamic characterization of engine mount at different orientation using sine swept frequency test Zaidi Mohd Ripin and Ooi Lu Ean, School of Mechanical Engineering Universiti Sains Malaysia (USM), 14300
More informationChapter 23: Principles of Passive Vibration Control: Design of absorber
Chapter 23: Principles of Passive Vibration Control: Design of absorber INTRODUCTION The term 'vibration absorber' is used for passive devices attached to the vibrating structure. Such devices are made
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 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 informationCRoNoS railway rolling noise prediction tool: wheelset model assessment
CRoNoS railway rolling noise prediction tool: wheelset model assessment Ainara Guiral CAF S.A., Beasain, Guipúzcoa, Spain. Blas Blanco TECNUN University of Navarra, San Sebastián, Guipúzcoa, Spain. Egoitz
More informationSound radiation and transmission. Professor Phil Joseph. Departamento de Engenharia Mecânica
Sound radiation and transmission Professor Phil Joseph Departamento de Engenharia Mecânica SOUND RADIATION BY A PISTON The piston generates plane waves in the tube with particle velocity equal to its own.
More informationinteraction and ground borne vibration Excitation mechanisms of train/track Structural Mechanics, Department of Civil Engineering, KU Leuven
RIVAS Training Workshop 9//23, Hotel Bloom, Brussels, Belgium "Reducing railway induced ground vibration by controlling the source" Excitation mechanisms of train/track interaction and ground borne vibration
More informationAcoustics-An An Overview. Lecture 1. Vibro-Acoustics. What? Why? How? Lecture 1
Vibro-Acoustics Acoustics-An An Overview 1 Vibro-Acoustics What? Why? How? 2 Linear Non-Linear Force Motion Arbitrary motion Harmonic Motion Mechanical Vibrations Sound (Acoustics) 3 Our heart beat, our
More informationTuning TMDs to Fix Floors in MDOF Shear Buildings
Tuning TMDs to Fix Floors in MDOF Shear Buildings This is a paper I wrote in my first year of graduate school at Duke University. It applied the TMD tuning methodology I developed in my undergraduate research
More informationFrancisco Paulo Lépore Neto. Marcelo Braga dos Santos. Introduction 1. Nomenclature. Experimental Apparatus and Formulation
Francisco Paulo Lépore Neto and Marcelo Braga dos Santos Francisco Paulo Lépore Neto fplepore@mecanica.ufu.br Federal University of Uberlandia School of Mechanical Engineering 38408-902 Uberlandia, MG,
More informationFrancisco Paulo Lépore Neto. Marcelo Braga dos Santos. Introduction 1. Nomenclature. Experimental Apparatus and Formulation
A Procedure for the Parametric Identification of Viscoelastic Dampers Accounting for Preload Francisco Paulo Lépore Neto fplepore@mecanica.ufu.br Federal University of Uberlândia School of Mechanical Engineering
More informationCIRCUIT RACING, TRACK TEXTURE, TEMPERATURE AND RUBBER FRICTION. Robin Sharp, Patrick Gruber and Ernesto Fina
CIRCUIT RACING, TRACK TEXTURE, TEMPERATURE AND RUBBER FRICTION Robin Sharp, Patrick Gruber and Ernesto Fina Outline General observations Grosch's experiments Interpretation of Grosch s results Rubber properties
More informationMetamaterials with tunable dynamic properties
Metamaterials with tunable dynamic properties Varvara Kouznetsova Marc Geers 6 October 2015 Mechanics of Materials Project aim development of new generation mechanical metamaterials with adaptive, tunable
More informationRailway induced ground vibration
RIVAS Training Workshop 23/5/213, Die Schmiede, Berlin, Germany "Reducing railway induced ground vibration by interventions on the transmission path" Railway induced ground vibration Geert Lombaert, Stijn
More informationDynamic Mechanical Analysis of Solid Polymers and Polymer Melts
Polymer Physics 2015 Matilda Larsson Dynamic Mechanical Analysis of Solid Polymers and Polymer Melts Polymer & Materials Chemistry Introduction Two common instruments for dynamic mechanical thermal analysis
More informationIndian railway track analysis for displacement and vibration pattern estimation
Indian railway track analysis for displacement and vibration pattern estimation M. Mohanta 1, Gyan Setu 2, V. Ranjan 3, J. P. Srivastava 4, P. K. Sarkar 5 1, 3 Department of Mechanical and Aerospace Engineering,
More informationAcoustic design of lightweight cabin walls for cruise ships
Acoustic design of lightweight cabin walls for cruise ships A. Treviso 1, M. G. Smith 1 1 ISVR Consulting, University of Southampton University Road, SO17 BJ1, Southampton, United Kingdom e-mail: mgs@isvr.soton.ac.uk
More informationVibration Measurements Vibration Instrumentation. MCE371: Vibrations. Prof. Richter. Department of Mechanical Engineering. Handout 11 Fall 2011
MCE371: Vibrations Prof. Richter Department of Mechanical Engineering Handout 11 Fall 2011 Overview of Vibration Measurements Follow Palm, Sect. pp 425-430 and 559-562. Additional references: Holman, J.P.,
More informationDynamic Vibration Analysis of an Isolator
6th International Conference on Recent Trends in Engineering & Technology (ICRTET - 2018) Dynamic Vibration Analysis of an Isolator Mr.Ahire Mangesh Ambadas, Associate Professor,Department of Mechanical
More informationDynamics of Railway Track
Machine Dynamics Problems 00, Vol. 8, No 1, 7 16 Abstract Dynamics of Railway Track Czesław Bajer 1 and Roman Bogacz Institute of Fundamental Technological Research, Polish Academy of Sciences cbajer@ippt.gov.pl,
More informationEffect of rail unevenness correlation on the prediction of ground-borne vibration from railways
Effect of rail unevenness correlation on the prediction of ground-borne vibration from railways Evangelos Ntotsios; David Thompson Institute of Sound and Vibration Research, University of Southampton,
More informationTesting Elastomers and Plastics for Marc Material Models
Testing Elastomers and Plastics for Marc Material Models Presented by: Kurt Miller Axel Products, Inc. axelproducts.com We Measure Structural Properties Stress Strain Time-Temperature Test Combinations
More informationInternational Journal of Advance Engineering and Research Development
Scientific Journal of Impact Factor (SJIF): 4.72 International Journal of Advance Engineering and Research Development Volume 4, Issue 11, November -2017 e-issn (O): 2348-4470 p-issn (P): 2348-6406 Study
More informationAnalysis of disc brake squeal using the complex eigenvalue method
Applied Acoustics 68 (2007) 603 615 www.elsevier.com/locate/apacoust Analysis of disc brake squeal using the complex eigenvalue method P. Liu a, *, H. Zheng a, C. Cai a, Y.Y. Wang a,c.lu a, K.H. Ang b,
More informationCOMPLEX MODULUS AND DAMPING MEASUREMENTS USING RESONANT AND NON-RESONANT METHODS
COMPLEX MODULUS AND DAMPING MEASUREMENTS USING RESONANT AND NON-RESONANT METHODS S. Gade, K. Zaveri, H. Konstantin-Hansen and H. Herlufsen Briiel & Kjaer, Skodsborgvej 307,285O Naerum, Denmark ABSTRACT
More informationFIFTH INTERNATIONAL CONGRESS ON SOUND AND VIBRATION DECEMBER 15-18, 1997 ADELAIDE, SOUTH AUSTRALIA
FFTH NTERNATONAL CONGRESS ON SOUND AND VBRATON DECEMBER 5-8, 997 ADELADE, SOUTH AUSTRALA VBRATON NSULATON OF TEST BENCHES FOR COMFORT AND FATGUE ASSESSMENT OF CARS Pietro Croce ), Pietro Orsini ),Walter
More informationDesign Procedures For Dynamically Loaded Foundations
Design Procedures For Dynamically Loaded Foundations 1/11 Choice of parameters for equivalent lumped systems Lumped mass : the mass of the foundation and supported machinery Damping : 1 Geometrical(or
More informationAbvanced Lab Course. Dynamical-Mechanical Analysis (DMA) of Polymers
Abvanced Lab Course Dynamical-Mechanical Analysis (DMA) of Polymers M211 As od: 9.4.213 Aim: Determination of the mechanical properties of a typical polymer under alternating load in the elastic range
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 informationThe present paper concentrates on the results of in situ vibration measurements performed within the
EXPERIMENTAL RESULTS OF FREE FIELD AND STRUCTURAL VIBRATIONS DUE TO UNDERGROUND RAILWAY TRAFFIC P. Chatterjee a, G. Degrande a, S. Jacobs a, J. Charlier b, P. Bouvet b and D. Brassenx c a K.U.Leuven, Department
More informationCompensation-based non-destructive automatic quality control using acoustic methods
Compensation-based non-destructive automatic quality control using acoustic methods Abstract Keywords Ingolf Hertlin RTE Akustik + Prüftechnik GmbH Gewerbestr. 26, D-76327 Pfinztal, Germany www.rte.de
More informationWhy You Can t Ignore Those Vibration Fixture Resonances Peter Avitabile, University of Massachusetts Lowell, Lowell, Massachusetts
Why You Can t Ignore Those Vibration Fixture Resonances Peter Avitabile, University of Massachusetts Lowell, Lowell, Massachusetts SOUND AND VIBRATION March 1999 Vibration fixtures, at times, have resonant
More informationProceedings of Meetings on Acoustics
Proceedings of Meetings on Acoustics Volume 9, 0 http://acousticalsociety.org/ ICA 0 Montreal Montreal, Canada - 7 June 0 Structural Acoustics and Vibration Session asa: History and Application of Constrained
More informationDESIGN AND DEVELOPMENT OF LABORATORY MODELS OF DYNAMIC VIBRATION ABSORBER
DESIGN AND DEVELOPMENT OF LABORATORY MODELS OF DYNAMIC VIBRATION ABSORBER CHAUHAN S. J. Assistant Professor, Department of Mechanical Engineering, FCRIT, Vashi, santosh.chauhan@fcrit.ac.in JOSHI A. S.
More informationActive elastomer components based on dielectric elastomers
Gummi Fasern Kunststoffe, 68, No. 6, 2015, pp. 412 415 Active elastomer components based on dielectric elastomers W. Kaal and S. Herold Fraunhofer Institute for Structural Durability and System Reliability
More informationModelling of Train Induced Vibration
Modelling of Train Induced Vibration E. Ntotsios 1, S.G. Koroma 1, W.I. Hamad 2, D.J. Thompson 1, H.E.M. Hunt 2, J.P. Talbot 2, M.F.M. Hussein 3 1 ISVR, University of Southampton, United Kingdom 2 Engineering
More informationStudies of Sound Radiation From Beams with Acoustic Black Holes
Studies of Sound Radiation From Beams with Acoustic Black Holes Chenhui Zhao 1, M.G. Prasad 2 Stevens Institute of Technology Abstract: Recently, Acoustic Black Holes (), a new passive structural modification
More informatione jωt = cos(ωt) + jsin(ωt),
This chapter introduces you to the most useful mechanical oscillator model, a mass-spring system with a single degree of freedom. Basic understanding of this system is the gateway to the understanding
More informationA Sloping Surface Roller Bearing and its lateral Stiffness Measurement
A Sloping Surface Roller Bearing and its lateral Stiffness Measurement George C. Lee 1 and Zach Liang Abstract In this paper the laboratory performance and advantages of a new roller-type seismic isolation
More informationD. BARD DIVISION OF ENGINEERING ACOUSTICS, LUND UNIVERSITY
Transmission, Reflections, Eigenfrequencies, Eigenmodes Tranversal and Bending waves D. BARD DIVISION OF ENGINEERING ACOUSTICS, LUND UNIVERSITY Outline Introduction Types of waves Eigenfrequencies & Eigenmodes
More informationA Modal Approach to Lightweight Partitions with Internal Resonators
A Modal Approach to Lightweight Partitions with Internal Resonators Steffen Hettler, Philip Leistner Fraunhofer-Institute of Building Physics, D-7569 Stuttgart, Nobelstrasse, Germany e-mail: hettler@ibp.fraunhofer.de,
More informationIntroduction to Vibration. Professor Mike Brennan
Introduction to Vibration Professor Mie Brennan Introduction to Vibration Nature of vibration of mechanical systems Free and forced vibrations Frequency response functions Fundamentals For free vibration
More informationChapter 7 Vibration Measurement and Applications
Chapter 7 Vibration Measurement and Applications Dr. Tan Wei Hong School of Mechatronic Engineering Universiti Malaysia Perlis (UniMAP) Pauh Putra Campus ENT 346 Vibration Mechanics Chapter Outline 7.1
More informationVibration Absorbers/Neutralisers. Professor Mike Brennan
Vibratio Absorbers/Neutralisers Professor Mike Brea Vibratio absorbers/eutralisers m k c Vibratio absorber/eutraliser What does it do? Absorber or eutraliser Mobility approach effectiveess of the device
More information19 th INTERNATIONAL CONGRESS ON ACOUSTICS MADRID, 2-7 SEPTEMBER 2007
19 th INTERNATIONAL CONGRESS ON ACOUSTICS MADRID, 2-7 SEPTEMBER 2007 FREQUENCY DEPENDENCY AND ANISOTROPY OF THE ELASTIC CONSTANTS OF (NON-)POROUS MATERIALS AND THEIR INFLUENCE ON THE USAGE IN BUILDING
More informationNon-linear Modal Behaviour in Cantilever Beam Structures
Non-linear Modal Behaviour in Cantilever Beam Structures Thamthada Suwanwong and Paul.W.Bland* Department of Mechanical Engineering Simulation & Design, The Sirindhorn International Thai-German Graduate
More informationCurve squeal in the presence of two wheel/rail contact points
Curve squeal in the presence of two wheel/rail contact points G. Squicciarini 1, S. Usberti 2, D.J. hompson 1, R. Corradi 2 and A. Barbera 2 1 Institute of Sound and Vibration Research, University of Southampton
More informationAccuracy, and the prediction of ground vibration from underground railways Hugh Hunt 1 and Mohammed Hussein 2
5 th Australasian Congress on Applied Mechanics, ACAM 2007 10-12 December 2007, Brisbane, Australia Accuracy, and the prediction of ground vibration from underground railways Hugh Hunt 1 and Mohammed Hussein
More informationTrillingsdempende materialen basis & eigenschappen Berekenen en toepassen op trillingsisolatie van technische installaties.
Trillingsdempende materialen basis & eigenschappen Berekenen en toepassen op trillingsisolatie van technische installaties Patrick Carels KVIV Studiedag Ingenieurshuis - Antwerpen www.cdm.eu 23/9/206 Content
More informationLecture 19. Measurement of Solid-Mechanical Quantities (Chapter 8) Measuring Strain Measuring Displacement Measuring Linear Velocity
MECH 373 Instrumentation and Measurements Lecture 19 Measurement of Solid-Mechanical Quantities (Chapter 8) Measuring Strain Measuring Displacement Measuring Linear Velocity Measuring Accepleration and
More informationMATHEMATICAL MODEL OF DYNAMIC VIBRATION ABSORBER-RESPONSE PREDICTION AND REDUCTION
ANNALS of Faculty Engineering Hunedoara International Journal of Engineering Tome XIV [2016] Fascicule 1 [February] ISSN: 1584-2665 [print; online] ISSN: 1584-2673 [CD-Rom; online] a free-access multidisciplinary
More informationS. OIE and R. TAKEUCHI: FLEXIBLE PLATE WITH POROUS LAYERS MOUNTED
S. OIE and R. TAKEUCHI: FLEXIBLE PLATE WITH POROUS LAYERS MOUNTED "generalized efficiency coefficient of radiation" for amplitude proposed in the previous paper15) and its absolute value generally has
More information1845. A novel approach for the evaluation of frequency-band loss factor based on last decay rate of vibrational amplitude
1845. A novel approach for the evaluation of frequency-band loss factor based on last decay rate of vibrational amplitude Jintao Gu 1, Meiping Sheng 2, Zhiwei Guo 3, Hanbei Guo 4 School of Marine Science
More informationStructural Dynamic Modification Studies Using Updated Finite Element Model
Structural Dynamic Modification Studies Using Updated Finite Element Model Gupta A. K., Nakra B. C. 1 and Kundra T. K. 2 IRDE Dehradun 1 NSIT New Delhi 2 Deptt. of Mechanical Engg. IIT New Delhi ABSTRACT.
More informationGROUND VIBRATION PREDICTION AND ASSESSMENT
GROUND VIBRATION PREDICTION AND ASSESSMENT R.M. Thornely-Taylor Rupert Taylor Ltd 1. INTRODUCTION Vibration is often grouped with noise and regarded as a kindred topic. Noise, after all, begins as vibration,
More informationPass-by and internal acoustic noise
Pass-by and internal acoustic noise by Ulf Carlsson Anders Frid Stockholm 2011 KTH Railway Group and Bombardier Transportation Sweden KTH Railway Group - Report 1107 www.railwaygroup.kth.se www.gronataget.se
More informationEstimation of damping capacity of rubber vibration isolators under harmonic excitation
Estimation of damping capacity of rubber vibration isolators under harmonic excitation Svetlana Polukoshko Ventspils University College, Engineering Research Institute VSRC, Ventspils, Latvia E-mail: pol.svet@inbox.lv
More informationMSC Elastomers Seminar Some Things About Elastomers
MSC Elastomers Seminar Some Things About Elastomers Kurt Miller, Axel Products, Inc. www.axelproducts.com Visit us at: axelproducts.com 2 Your Presenter Kurt Miller Founded Axel Products 1994 Instron Corporation,
More informationMEG6007: Advanced Dynamics -Principles and Computational Methods (Fall, 2017) Lecture DOF Modeling of Shock Absorbers. This lecture covers:
MEG6007: Advanced Dynamics -Principles and Computational Methods (Fall, 207) Lecture 4. 2-DOF Modeling of Shock Absorbers This lecture covers: Revisit 2-DOF Spring-Mass System Understand the den Hartog
More informationDesign of an Innovative Acoustic Metamaterial
Design of an Innovative Acoustic Metamaterial PAVLOS MAVROMATIDIS a, ANDREAS KANARACHOS b Electrical Engineering Department a, Mechanical Engineering Department b Frederick University 7 Y. Frederickou
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 informationAN ALTERNATIVE APPROACH TO SOLVE THE RAILWAY MAINTENANCE PROBLEM
AN ALERNAIVE APPROACH O SOLVE HE RAILWAY MAINENANCE PROBLEM Giancarlo Fraraccio, ENEA centro ricerca CASACCIA, FIM-MA-QUAL Italy Gerardo De Canio, ENEA centro ricerca CASACCIA, FIM-MA-QUAL Italy Gianni
More informationModeling and Experimentation: Mass-Spring-Damper System Dynamics
Modeling and Experimentation: Mass-Spring-Damper System Dynamics Prof. R.G. Longoria Department of Mechanical Engineering The University of Texas at Austin July 20, 2014 Overview 1 This lab is meant to
More informationExperimental characterization of dry friction isolators for shock vibration isolation
PROCEEDINGS of the 22 nd International Congress on Acoustics Structural Acoustics and Vibration (others): Paper ICA2016-602 Experimental characterization of dry friction isolators for shock vibration isolation
More informationExperimental Modal Analysis (EMA) on a vibration cube fixture M. Sc. Emanuel Malek Eindhoven November 2017
Experimental Modal Analysis (EMA) on a vibration cube fixture M. Sc. Emanuel Malek Eindhoven November 207 Test and Measurement Solutions Content Introduction Basics Why EMA? Preparation and execution Testing
More informationEffects of Mounting and Exciter Coupling on Vibrothermographic NDE
Effects of Mounting and Exciter Coupling on Vibrothermographic NDE Jyani S. Vaddi, Gabriel Murray and Stephen D. Holland Department of Aerospace Engineering and Center for Nondestructive Evaluation, Iowa
More informationAPPLICATIONS OF HERMETICALLY SEALED FLUID DAMPERS FOR LOW LEVEL, WIDE BANDWIDTH VIBRATION ISOLATION
APPLICATIONS OF HERMETICALLY SEALED FLUID DAMPERS FOR LOW LEVEL, WIDE BANDWIDTH VIBRATION ISOLATION by Alan R. Klembczyk, Chief Engineer Taylor Devices, Inc. 90 Taylor Drive North Tonawanda, NY 14120-0748
More informationBroadband Vibration Response Reduction Using FEA and Optimization Techniques
Broadband Vibration Response Reduction Using FEA and Optimization Techniques P.C. Jain Visiting Scholar at Penn State University, University Park, PA 16802 A.D. Belegundu Professor of Mechanical Engineering,
More informationI INTRODUCTION II THEORY
Estimation of Loss Factor of Viscoelastic Material by Using Cantilever Sandwich Plate 1 Jitender Kumar, 2 Dr. Rajesh Kumar 1 Geeta Engineering College (Panipat) 2 SLIET Longowal, Punjab 1 jitd2007@rediffmail.com
More informationUniversity of Southampton Research Repository eprints Soton
University of Southampton Research Repository eprints Soton Copyright and Moral Rights for this thesis are retained by the author and/or other copyright owners. A copy can be downloaded for personal non-commercial
More informationLorentz Contact Resonance for viscoelastic measurements of polymer blends
The world leader in nanoscale IR spectroscopy for viscoelastic measurements of polymer blends (LCR) reliably compares viscoleastic properties with nanoscale spatial resolution With no moving parts in the
More informationGrandstand Terraces. Experimental and Computational Modal Analysis. John N Karadelis
Grandstand Terraces. Experimental and Computational Modal Analysis. John N Karadelis INTRODUCTION Structural vibrations caused by human activities are not known to be particularly damaging or catastrophic.
More information1427. Response and performance of a nonlinear vibration isolator with high-static-low-dynamic-stiffness under shock excitations
1427. Response and performance of a nonlinear vibration isolator with high-static-low-dynamic-stiffness under shock excitations Yong Wang 1, Shunming Li 2, Jiyong Li 3, Xingxing Jiang 4, Chun Cheng 5 College
More informationNUMERICAL MODELLING OF RUBBER VIBRATION ISOLATORS
NUMERICAL MODELLING OF RUBBER VIBRATION ISOLATORS Clemens A.J. Beijers and André de Boer University of Twente P.O. Box 7, 75 AE Enschede, The Netherlands email: c.a.j.beijers@utwente.nl Abstract An important
More informationResponse of a Physical Mechanical System
Response of a Physical Mechanical System Response of a Physical System Motivation The objective of this experiment is to familiarize you with the basic system modeling and concepts of analysis and control
More informationThe Design of a Multiple Degree of Freedom Flexure Stage with Tunable Dynamics for Milling Experimentation
The Design of a Multiple Degree of Freedom Flexure Stage with Tunable Dynamics for Milling Experimentation Mark A. Rubeo *, Kadir Kiran *, and Tony L. Schmitz The University of North Carolina at Charlotte,
More informationInvestigation of Passive Control Devices for Potential Application to a Launch Vehicle Structure to Reduce the Interior Noise Levels During Launch
Investigation of Passive Control Devices for Potential Application to a Launch Vehicle Structure to Reduce the Interior Noise Levels During Launch Report for Stage 4 Tasks 1 and 2 July 24 Prepared For:
More informationApplication of a novel method to identify multi-axis joint properties
Application of a novel method to identify multi-axis joint properties Scott Noll, Jason Dreyer, and Rajendra Singh The Ohio State University, 219 W. 19 th Avenue, Columbus, Ohio 4321 USA ABSTRACT This
More informationAnalysis of Local Vibration for High-Speed Railway Bridge Based on Finite Element Method
Send Orders for Reprints to reprints@benthamscience.ae 91 The Open Mechanical Engineering Journal, 214, 8, 91-915 Open Access Analysis of Local Vibration for High-Speed Railway Bridge Based on Finite Element
More informationDetermination of Natural Frequency of Transportation Container by Experimental Modal Analysis
Determination of Natural Frequency of Transportation Container by Experimental Modal Analysis S.S.Pachpore1, S.N.Khan 2, Dr. S.S. Salunkhe 3,V.J.Jagtap 4 1( Student, RSSOER, JSPM NarheTecnicalCampus, Pune,
More information