Acoustics Analysis of Speaker ANSYS, Inc. November 28, 2014

Size: px
Start display at page:

Download "Acoustics Analysis of Speaker ANSYS, Inc. November 28, 2014"

Transcription

1 Acoustics Analysis of Speaker 1

2 Introduction ANSYS 14.0 offers many enhancements in the area of acoustics. In this presentation, an example speaker analysis will be shown to highlight some of the acoustics enhancements in 14.0: Structural-acoustic coupling using the symmetric fluidstructure interaction (FSI) algorithm Postprocessing velocities Far-field postprocessing of acoustic field (output of pressure and SPL outside of meshed region) 2

3 Background on Acoustics Acoustics in ANSYS Mechanical involves solving the acoustic wave equation to determine the propagation of acoustic waves in a fluid medium: 2 1 ω p + 2 ρ a a ( x) ρ( x) c ( x) ρ( ) The above includes non-uniform medium and mass source terms, new in This is converted in matrix form to solve with finite elements: [ M ]{ p} + [ C ]{ p } + [ K ]{ p} { q} p p p = p = jω Q x 3

4 4 Vibroacoustic problems can be solved by coupling the acoustic and structural equations together: The symmetric form of the harmonic FSI equations shown above is introduced in 14.0 for faster solution times. The fluid-structure coupling term is C fs. An unsymmetric form from prior releases is still available. The sloshing term S q exists for free surfaces. Since the equations are tightly coupled, the structural motions generate sound, and the acoustic waves can vibrate the structure. Background on Acoustics = = = f f u q K K u q C C C C j u q M S g M q j q p q u q o u fs fs q o u q q o ρ ρ ω ρ ω ω

5 Background on Acoustics Perfectly Matched Layers or PML is a special formulation to absorb outgoing acoustic waves in harmonic response analyses to prevent waves from reflecting back into the system. Sound Pressure Level or SPL is defined as follows: L p = 20log P rms is the root-mean-square of the pressure, or the amplitude divided by sqrt(2) SPL is measured in decibels The reference pressure in air is typically taken as 20 µpa. p p rms ref 5

6 Geometry & Mesh of Structure The geometry of the speaker in an enclosure is shown below. Note that ¼ symmetry is used: For the speaker, forces are exerted on the voicecoil, causing it to move. The voicecoil moves the cone which is what displaces the air to produce sound. The surround and spider connect and stabilize the cone to the rigid frame. 6

7 Geometry and Mesh of Air The air surrounding the speaker enclosure is shown: The air around the speaker is meshed with acoustic fluid elements. To absorb outgoing acoustic waves, perfectly-matched layers (PML) is used. This PML region is shown on the right. 7

8 Activating Acoustic Elements A Commands (APDL) object is inserted under the acoustic bodies In the example shown on the right, the et command changes the element type to be an acoustic element using the new symmetric FSI algorithm. Density and speed of sound are also defined. 8 New in 14.0!

9 Fluid-Structure Interaction (FSI) In vibroacoustic problems solved in ANSYS Mechanical, the term FSI refers to coupling of the acoustic and structural equations ANSYS Mechanical can solve modal, transient, or harmonic response analyses with FSI The acoustic linear wave equations are solved with the structural equations of motion in a coupled manner (in one matrix). 9

10 Created Named Selection for PML A Named Selection of the truncated boundary is created for PML The outermost, truncated boundary should be specified through a Named Selection. This will be referenced with a Commands object, shown later 10

11 Create Named Selection for FSI A Named Selection of the FSI interface is also created The surfaces between the acoustic bodies and structural bodies should be selected and placed in a Named Selection. This will also be referenced later in a Commands object. 11

12 Define PML and FSI Regions Another Commands (APDL) object is inserted under the Harmonic Response branch The APDL commands on the right define the boundary condition on the PML region as well as apply the FSI flag to the Named Selections indicated previously. 12

13 User-Defined Results for Pressure User-Defined Results allow for postprocessing acoustic pressure or calculating SPL Isosurfaces of sound pressure level are shown on the right. Identifiers and expressions in User- Defined Results provide flexibility to manipulate results 13

14 User-Defined Results for Velocity Velocities can be plotted with a User-Defined Result using PGVECTORS Standard vector plot controls such as solid vectors, uniform vector distribution, uniform vector size are available. Here, line vectors at each node designating the velocity is shown. New in 14.0! 14

15 Perform Far-Field Postprocessing A Commands (APDL) object under the Solution branch allows for far-field postprocessing The lines shown in the highlighted section are used for far-field postprocessing. Namely, HFSYM defines symmetry planes, and PLFAR is used to plot results. New in 14.0! 15

16 Perform Far-Field Postprocessing The directivity plot at 1 meter (beyond mesh domain) is shown below One can determine how focused the acoustic signal is from this plot, which can help evaluate speaker performance. New in 14.0! 16

17 Perform Frequency Sweep While a frequency sweep can be specified within a Harmonic Response analysis, one can also use Workbench Parameters to specify the sweep Note that Frequency is a Workbench Parameter. The frequency for the analysis is made as a parameter equal to this value. The benefit to this approach is that users can add frequencies to the solution after solving without having the re-solve the entire frequency range 17

18 Perform Frequency Sweep with RSM By using this approach, users can also take advantage of Remote Solve Manager (RSM) to submit jobs on a cluster Instead of solving each frequency sequentially, if a user has more than one ANSYS Mechanical license, the jobs can be submitted through RSM Whether solving locally, on two machines, or on a cluster, multiple frequencies can then be solved simultaneously, thus decreasing overall solution time! 18

19 Review Frequency Sweep Results After the solution is complete, one can plot results within the Workbench Parameters page An output of SPL in front of the speaker, designated earlier, is tracked in this example. In speaker design, a constant response is sought within the frequency range of interest. This example shows that structural resonance around 800 Hz is causing undesirable behavior. 19

20 New Symmetric Option in 14.0 In the past, ANSYS Mechanical solved these two physics simultaneously with unsymmetric matrices, which required double the memory and more CPU time. In ANSYS 14.0, symmetric option is introduced to cut memory requirements in half and significantly decreasing CPU time. New in 14.0! 20 The table on the right compares the overall solution time speed-up for 275k DOF solved on dual quadcore Intel Xeon E5530. Note that the symmetric option is about 1.5 times faster for this model on this model on this particular hardware. Cores Solver Option Speed-up 1 Sparse Unsym Sparse Sym Sparse Unsym Sparse Sym Sparse Unsym Sparse Sym 1.50

21 Using GPU Accelerator The GPU Accelerator can also help decrease solution time for vibroacoustic problems. GPU Accelerator performs the solver computation on the graphics card cores. The table on the right compares the overall solution time speed-up for 275k DOF solved on dual quadcore Intel Xeon E5530. Note that the GPU Accelerator provides noticeable speed-up for this model on this model on this particular hardware. Cores Solver GPU Speed-up 1 Sparse off Sparse off Sparse off Sparse on Sparse on Sparse on

22 Other New 14.0 Features in Acoustics There are a myriad of other new acoustics features not covered in this presentation: Non-uniform acoustic medium, which can be a function of temperature or static pressure Acoustic scattering capability and ability to output total or scattered pressure Ability to input bulk viscosity to model viscous losses Mass sources, impedance sheet, normal velocity b.c. Near-field postprocessing Ability to define external planar wave, monopole, dipole sources 22

FastBEM Acoustics. Verification Manual , Advanced CAE Research, LLC (ACR) Cincinnati, Ohio, USA All Rights Reserved

FastBEM Acoustics. Verification Manual , Advanced CAE Research, LLC (ACR) Cincinnati, Ohio, USA All Rights Reserved FastBEM Acoustics Verification Manual 2007-2017, Advanced CAE Research, LLC (ACR) Cincinnati, Ohio, USA All Rights Reserved www.fastbem.com Copyright 2007-2017, Advanced CAE Research, LLC, All Rights Reserved

More information

Vibro-acoustic Analysis for Noise Reduction of Electric Machines

Vibro-acoustic Analysis for Noise Reduction of Electric Machines Vibro-acoustic Analysis for Noise Reduction of Electric Machines From Flux to OptiStruct Example : Synchronous Machine Flux 2D coupling to OptiStruct Patrick LOMBARD Application Team Manager Patrick.Lombard@cedrat.com

More information

Transducer Design and Modeling 42 nd Annual UIA Symposium Orlando Florida Jay Sheehan JFS Engineering. 4/23/2013 JFS Engineering

Transducer Design and Modeling 42 nd Annual UIA Symposium Orlando Florida Jay Sheehan JFS Engineering. 4/23/2013 JFS Engineering 42 nd Annual UIA Symposium Orlando Florida 2013 Jay Sheehan JFS Engineering Introduction ANSYS Workbench Introduction The project format Setting up different analysis Static, Modal and Harmonic Connection

More information

Chapter 5: Random Vibration. ANSYS Mechanical. Dynamics. 5-1 July ANSYS, Inc. Proprietary 2009 ANSYS, Inc. All rights reserved.

Chapter 5: Random Vibration. ANSYS Mechanical. Dynamics. 5-1 July ANSYS, Inc. Proprietary 2009 ANSYS, Inc. All rights reserved. Chapter 5: Random Vibration ANSYS Mechanical Dynamics 5-1 July 2009 Analysis Random Vibration Analysis Topics covered: Definition and purpose Overview of Workbench capabilities Procedure 5-2 July 2009

More information

International Journal of Scientific & Engineering Research, Volume 5, Issue 7, July-2014 ISSN

International 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 information

Coupling Physics. Tomasz Stelmach Senior Application Engineer

Coupling Physics. Tomasz Stelmach Senior Application Engineer Coupling Physics Tomasz Stelmach Senior Application Engineer Agenda Brief look @ Multiphysics solution What is new in R18 Fluent Maxwell coupling wireless power transfer Brief look @ ANSYS Multiphysics

More information

Acoustic radiation by means of an acoustic dynamic stiffness matrix in spherical coordinates

Acoustic radiation by means of an acoustic dynamic stiffness matrix in spherical coordinates Acoustic radiation by means of an acoustic dynamic stiffness matrix in spherical coordinates Kauê Werner and Júlio A. Cordioli. Department of Mechanical Engineering Federal University of Santa Catarina

More information

Structural Optimization. for Acoustic Disciplines

Structural Optimization. for Acoustic Disciplines Optimization for Acoustic Disciplines 4. Norddeutschen Simulationsforum 26 May Hamburg, Germany Claus B.W. Pedersen (claus.pedersen@fe-design.com) Peter M. Clausen, Peter Allinger, Jens Harder FE-Design

More information

Numerical Model of the Insertion Loss Promoted by the Enclosure of a Sound Source

Numerical Model of the Insertion Loss Promoted by the Enclosure of a Sound Source Numerical Model of the Insertion Loss Promoted by the Enclosure of a Sound Source Gil F. Greco* 1, Bernardo H. Murta 1, Iam H. Souza 1, Tiago B. Romero 1, Paulo H. Mareze 1, Arcanjo Lenzi 2 and Júlio A.

More information

Prediction of Sound Propagation From Power Transmission Plant

Prediction of Sound Propagation From Power Transmission Plant Prediction of Sound Propagation From Power Transmission Plant Jingchao Sun Stockholm, 2013 Thesis for the degree of Master of Science, 30 Hp Department of Sound and Vibration The Marcus Wallenberg Laboratory

More information

CAEFEM v9.5 Information

CAEFEM v9.5 Information CAEFEM v9.5 Information Concurrent Analysis Corporation, 50 Via Ricardo, Thousand Oaks, CA 91320 USA Tel. (805) 375 1060, Fax (805) 375 1061 email: info@caefem.com or support@caefem.com Web: http://www.caefem.com

More information

Lecture 9 Thermal Analysis

Lecture 9 Thermal Analysis Lecture 9 Thermal Analysis 16.0 Release Introduction to ANSYS Mechanical 1 2015 ANSYS, Inc. February 27, 2015 Chapter Overview In this chapter, performing steady-state thermal analyses in Mechanical will

More information

Chapter 5. Vibration Analysis. Workbench - Mechanical Introduction ANSYS, Inc. Proprietary 2009 ANSYS, Inc. All rights reserved.

Chapter 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 information

New Developments of Frequency Domain Acoustic Methods in LS-DYNA

New Developments of Frequency Domain Acoustic Methods in LS-DYNA 11 th International LS-DYNA Users Conference Simulation (2) New Developments of Frequency Domain Acoustic Methods in LS-DYNA Yun Huang 1, Mhamed Souli 2, Rongfeng Liu 3 1 Livermore Software Technology

More information

Comparison of Analytical and Numerical Solutions of Acoustic and Vibro-acoustic Cavities

Comparison of Analytical and Numerical Solutions of Acoustic and Vibro-acoustic Cavities Comparison of Analytical and Numerical Solutions of Acoustic and Vibro-acoustic Cavities ABSTRACT Álvaro Campos Ferreira, Marcus Vinicius Girão de Morais Department of Mechanical Engineering Universidade

More information

LOUDSPEAKER ROCKING MODES MODELLING AND ROOT CAUSE ANALYSIS. William Cardenas and Wolfgang Klippel. Presented by Stefan Irrgang. KLIPPEL GmbH.

LOUDSPEAKER ROCKING MODES MODELLING AND ROOT CAUSE ANALYSIS. William Cardenas and Wolfgang Klippel. Presented by Stefan Irrgang. KLIPPEL GmbH. LOUDSPEAKER ROCKING MODES MODELLING AND ROOT CAUSE ANALYSIS William Cardenas and Wolfgang Klippel Presented by Stefan Irrgang KLIPPEL GmbH Loudspeaker Rocking Modes, Part 1 Modelling and root cause analysis,

More information

Simulation of Horn Driver Response by Direct Combination of Compression Driver Frequency Response and Horn FEA

Simulation of Horn Driver Response by Direct Combination of Compression Driver Frequency Response and Horn FEA Simulation of Horn Driver Response by Direct Combination of Compression Driver Response and Horn FEA Dario Cinanni CIARE, Italy Corresponding author: CIARE S.r.l., strada Fontenuovo 306/a, 60019 Senigallia

More information

Fundamentals of Acoustics

Fundamentals of Acoustics Fundamentals of Acoustics Introductory Course on Multiphysics Modelling TOMASZ G. ZIELIŃSKI bluebox.ippt.pan.pl/ tzielins/ Institute of Fundamental Technological Research of the Polish Academy of Sciences

More information

Matrix Assembly in FEA

Matrix Assembly in FEA Matrix Assembly in FEA 1 In Chapter 2, we spoke about how the global matrix equations are assembled in the finite element method. We now want to revisit that discussion and add some details. For example,

More information

Simulation of acoustic and vibroacoustic problems in LS-DYNA using boundary element method ABSTRACT:

Simulation of acoustic and vibroacoustic problems in LS-DYNA using boundary element method ABSTRACT: Simulation of acoustic and vibroacoustic problems in LS-DYNA using boundary element method Yun Hang, Mhamed Souli, Rogelio Perez Livermore Software Technology Corporation USA & University of Lille Laboratoire

More information

UNIVERSITY OF SASKATCHEWAN Department of Physics and Engineering Physics

UNIVERSITY OF SASKATCHEWAN Department of Physics and Engineering Physics UNIVERSITY OF SASKATCHEWAN Department of Physics and Engineering Physics Physics 117.3 MIDTERM TEST February 12, 2015 Time: 90 minutes NAME: (Last) Please Print (Given) STUDENT NO.: LECTURE SECTION (please

More information

ANALYSIS AND EXPERIMENT OF DYNAMIC CHARACTERISTICS OF ELECTRONIC DEVICE CHASSIS

ANALYSIS AND EXPERIMENT OF DYNAMIC CHARACTERISTICS OF ELECTRONIC DEVICE CHASSIS ANALYSIS AND EXPERIMENT OF DYNAMIC CHARACTERISTICS OF ELECTRONIC DEVICE CHASSIS HE QING, DU DONGMEI, JIANG XUCHAO Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, Ministry

More information

New Facilities for Multiphysics Modelling in Opera-3d version 16 By Chris Riley

New Facilities for Multiphysics Modelling in Opera-3d version 16 By Chris Riley FEA ANALYSIS General-purpose multiphy sics design and analy sis softw are for a w ide range of applications OPTIMIZER A utomatically selects and manages multiple goalseeking algorithms INTEROPERABILITY

More information

Transmission Matrix Model of a Quarter-Wave-Tube with Gas Temperature Gradients

Transmission 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 information

Analytical Solution for a Fluid-Structure Interaction Problem in Comparison with Finite Element Solution

Analytical Solution for a Fluid-Structure Interaction Problem in Comparison with Finite Element Solution Analytical Solution for a Fluid-Structure Interaction Problem in Comparison with Finite Element Solution Amirhossein Keivani & Ahmad Shooshtari Ferdowsi University of Mashhad, Mashhad, Iran. Ahmad Aftabi

More information

Sound Propagation through Media. Nachiketa Tiwari Indian Institute of Technology Kanpur

Sound Propagation through Media. Nachiketa Tiwari Indian Institute of Technology Kanpur Sound Propagation through Media Nachiketa Tiwari Indian Institute of Technology Kanpur LECTURE-17 HARMONIC PLANE WAVES Introduction In this lecture, we discuss propagation of 1-D planar waves as they travel

More information

Effects of mass distribution and buoyancy on the sound radiation of a fluid loaded cylinder

Effects of mass distribution and buoyancy on the sound radiation of a fluid loaded cylinder Effects of mass distribution and buoyancy on the sound radiation of a fluid loaded cylinder Hongjian Wu, Herwig Peters, Roger Kinns and Nicole Kessissoglou School of Mechanical and Manufacturing, University

More information

A 3 D finite element model for sound transmission through a double plate system with isotropic elastic porous materials

A 3 D finite element model for sound transmission through a double plate system with isotropic elastic porous materials Acoustics and Vibrations Group Université de Sherbrooke, QC CANADA Département génie mécanique Université de Sherbrooke Sherbrooke, QC CANADA Tel.: (819) 821-7157 Fax: (819) 821-7163 A 3 D finite element

More information

Introduction to Acoustics Exercises

Introduction to Acoustics Exercises . 361-1-3291 Introduction to Acoustics Exercises 1 Fundamentals of acoustics 1. Show the effect of temperature on acoustic pressure. Hint: use the equation of state and the equation of state at equilibrium.

More information

Flow-Induced Vibration Modeling

Flow-Induced Vibration Modeling Flow-Induced Vibration Modeling Bin Zhu, Hector H. Mireles, and Aqib Qureshi Baker Hughes Abstract: The current work pertains to a re-closeable annular flow valve oil completion tool (X- AFV) with high

More information

P773 Acoustics June, 2008

P773 Acoustics June, 2008 P773 Acoustics June, 2008 1 Physical principle 2 3 Denotes an Example 4 5 Measure pressure inside sealed box 6 Acoustic impulse response inside the box 7 8 Air spring only 9 10 For Plane Waves 11 More

More information

An explicit time-domain finite-element method for room acoustics simulation

An explicit time-domain finite-element method for room acoustics simulation An explicit time-domain finite-element method for room acoustics simulation Takeshi OKUZONO 1 ; Toru OTSURU 2 ; Kimihiro SAKAGAMI 3 1 Kobe University, JAPAN 2 Oita University, JAPAN 3 Kobe University,

More information

Transmission Matrix Model of a Quarter-Wave-Tube with Gas Temperature Gradients

Transmission 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 information

Transmission Loss of a Dissipative Muffler with Perforated Central Pipe

Transmission Loss of a Dissipative Muffler with Perforated Central Pipe Transmission Loss of a Dissipative Muffler with Perforated Central Pipe 1 Introduction This example problem demonstrates Coustyx ability to model a dissipative muffler with a perforated central pipe. A

More information

The Corrected Expressions for the Four-Pole Transmission Matrix for a Duct with a Linear Temperature Gradient and an Exponential Temperature Profile

The 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 information

BEM Methods for Acoustic and Vibroacoustic Problems in LS-DYNA

BEM Methods for Acoustic and Vibroacoustic Problems in LS-DYNA 12 th International LS-DYNA Users Conference Simulation(2) BEM Methods for Acoustic and Vibroacoustic Problems in LS-DYNA Mhamed Souli, Yun Huang, Rongfeng Liu Livermore Software Technology Corporation

More information

NX Nastran 10. Rotor Dynamics User s Guide

NX Nastran 10. Rotor Dynamics User s Guide NX Nastran 10 Rotor Dynamics User s Guide Proprietary & Restricted Rights Notice 2014 Siemens Product Lifecycle Management Software Inc. All Rights Reserved. This software and related documentation are

More information

Virtual Prototyping of Electrodynamic Loudspeakers by Utilizing a Finite Element Method

Virtual 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 information

Advantages, Limitations and Error Estimation of Mixed Solid Axisymmetric Modeling

Advantages, Limitations and Error Estimation of Mixed Solid Axisymmetric Modeling Advantages, Limitations and Error Estimation of Mixed Solid Axisymmetric Modeling Sudeep Bosu TATA Consultancy Services Baskaran Sundaram TATA Consultancy Services, 185 Lloyds Road,Chennai-600086,INDIA

More information

Structural System, Machines and Load Cases

Structural System, Machines and Load Cases Machine-Induced Vibrations Machine-Induced Vibrations In the following example the dynamic excitation of two rotating machines is analyzed. A time history analysis in the add-on module RF-DYNAM Pro - Forced

More information

Titelmasterformat durch Klicken bearbeiten

Titelmasterformat durch Klicken bearbeiten Titelmasterformat durch Klicken bearbeiten Vibration and Acoustics for Electric Drive Development Presenter: Jens Otto, CADFEM GmbH Developer: Dr. Jürgen Wibbeler, Dr. Martin Hanke, CADFEM GmbH 4th CADFEM

More information

Side branch resonators modelling with Green s function methods

Side branch resonators modelling with Green s function methods Side branch resonators modelling with Green s function methods E. Perrey-Debain, R. Maréchal, J.-M. Ville Laboratoire Roberval UMR 6253, Equipe Acoustique, Université de Technologie de Compiègne, France

More information

Investigation 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 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 information

D && 9.0 DYNAMIC ANALYSIS

D && 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 information

SIMULATION OF ORGAN PIPES ACOUSTIC BEHAVIOR BY MEANS OF VARIOUS NUMERICAL TECHNIQUES

SIMULATION OF ORGAN PIPES ACOUSTIC BEHAVIOR BY MEANS OF VARIOUS NUMERICAL TECHNIQUES SIMULATION OF ORGAN PIPES ACOUSTIC BEHAVIOR BY MEANS OF VARIOUS NUMERICAL TECHNIQUES Péter Rucz, Fülöp Augusztinovicz, Péter Fiala Budapest University of Technology and Economics Department of Telecommunications

More information

Simulation of Acoustic and Vibro-Acoustic Problems in LS-DYNA using Boundary Element Method

Simulation of Acoustic and Vibro-Acoustic Problems in LS-DYNA using Boundary Element Method 10 th International LS-DYNA Users Conference Simulation Technolog (2) Simulation of Acoustic and Vibro-Acoustic Problems in LS-DYNA using Boundar Element Method Yun Huang Livermore Software Technolog Corporation

More information

THE EFFECTS OF ABSORBER ATTACHMENT LOCATION ON VIBRATION RESPONSE OF SIMPLY SUPPORTED PLATE

THE EFFECTS OF ABSORBER ATTACHMENT LOCATION ON VIBRATION RESPONSE OF SIMPLY SUPPORTED PLATE THE EFFECTS OF ABSORBER ATTACHMENT LOCATION ON VIBRATION RESPONSE OF SIMPLY SUPPORTED PLATE Muhammad Mohamed Salleh 1 and Izzuddin Zaman 1,2 1 Faculty of Mechanical and Manufacturing Engineering, 2 Structural

More information

DYNAMIC CHARACTERISTICS OF A PARTIALLY FLUID- FILLED CYLINDRICAL SHELL

DYNAMIC 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 information

Simulation of a Thermo-Acoustic Refrigerator

Simulation of a Thermo-Acoustic Refrigerator Simulation of a Thermo-Acoustic Refrigerator Sohaib Ahmed 1, Abdul Rehman 1, Ammad Fareed 1, Syed Muhammad Sabih ul Haque 1, Ali Muhammad Hadi 1 1 National University of Sciences and Technology (NUST),

More information

Engine-Gasket HPC trial and Suspension NVH analysis using Linear_Perturbation ANSYS Japan Mechanical BU Toru Hiyake

Engine-Gasket HPC trial and Suspension NVH analysis using Linear_Perturbation ANSYS Japan Mechanical BU Toru Hiyake Engine-Gasket HPC trial and Suspension NVH analysis using Linear_Perturbation ANSYS Japan Mechanical BU Toru Hiyake Agenda Topic 1 : Engine-Gasket Nonlinear Analysis Legacy Data Import Gasket modeling

More information

Why 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 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 information

ACTRAN Modules. Products overview. Copyright Free Field Technologies

ACTRAN Modules. Products overview. Copyright Free Field Technologies ACTRAN Modules Products overview Copyright Free Field Technologies ACTRAN ACTRAN is the most complete CAE tool for Acoustic, Aero-acoustic and Vibro-acoustic modelling. ACTRAN is based on the finite and

More information

Program System for Machine Dynamics. Abstract. Version 5.0 November 2017

Program System for Machine Dynamics. Abstract. Version 5.0 November 2017 Program System for Machine Dynamics Abstract Version 5.0 November 2017 Ingenieur-Büro Klement Lerchenweg 2 D 65428 Rüsselsheim Phone +49/6142/55951 hd.klement@t-online.de What is MADYN? The program system

More information

"C:\Program Files\ANSYS Inc\v190\CFX\bin\perllib\cfx5solve.pl" -batch -ccl runinput.ccl -fullname "Fluid Flow CFX_002"

C:\Program Files\ANSYS Inc\v190\CFX\bin\perllib\cfx5solve.pl -batch -ccl runinput.ccl -fullname Fluid Flow CFX_002 This run of the CFX Release 19.0 Solver started at 19:06:17 on 05 Jun 2018 by user ltval on DESKTOP-JCG0747 (intel_xeon64.sse2_winnt) using the command: "C:\Program Files\ANSYS Inc\v190\CFX\bin\perllib\cfx5solve.pl"

More information

Efficient Simulation for Strongly Coupled Noise-Vibration- Harshness (NVH)

Efficient Simulation for Strongly Coupled Noise-Vibration- Harshness (NVH) Efficient Simulation for Strongly Coupled Noise-Vibration- Harshness (NVH) R. S. Puri, D. Morrey School of Technology, Oxford Brookes University, Wheatley Campus, Wheatley, Oxford OX33 1HX, United Kingdom,

More information

Learning Acoustics through the Boundary Element Method: An Inexpensive Graphical Interface and Associated Tutorials

Learning Acoustics through the Boundary Element Method: An Inexpensive Graphical Interface and Associated Tutorials Learning Acoustics through the Boundary Element Method: An Inexpensive Graphical Interface and Associated Tutorials ABSTRACT Laura A. Brooks, Rick C. Morgans, Colin H. Hansen School of Mechanical Engineering,

More information

Broadband Vibration Response Reduction Using FEA and Optimization Techniques

Broadband 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 information

2008 International ANSYS Conference

2008 International ANSYS Conference 2008 International ANSYS Conference Study of Nonlinear Parametric Response in a Beam using ANSYS Satish Remala, John Baker, and Suzanne Smith University of Kentucky 2008 ANSYS, Inc. All rights reserved.

More information

Ravichetan Dharenni, Ashok M H, Santoshkumar Malipatil

Ravichetan Dharenni, Ashok M H, Santoshkumar Malipatil Modal Analysis of Laminated Composite Material with Actuators on Cantilever Beam Using ANSYS Ravichetan Dharenni, Ashok M H, Santoshkumar Malipatil Department of Mechanical Engineering, VTU University,

More information

Static and Modal Analysis of Telescope Frame in Satellite

Static and Modal Analysis of Telescope Frame in Satellite Abstract Static and Modal Analysis of Telescope Frame in Satellite Sun Libin Department of Mechanical Engineering Tsinghua University Feng Hui School of Material Science and Engineering University of Science

More information

Sound Attenuation by Hearing Aid Earmold Tubing

Sound Attenuation by Hearing Aid Earmold Tubing Excerpt from the Proceedings of the COMSOL Conference 2008 Hannover Sound Attenuation by Hearing Aid Earmold Tubing Mads J. Herring Jensen Widex A/S Ny Vestergaardsvej 19, DK-3500 Vaerloese, Denmark, mjj@widex.dk

More information

Mecanum. Acoustic Materials: Characterization. We build silence. Mecanum Inc.

Mecanum. Acoustic Materials: Characterization. We build silence. Mecanum Inc. ecanum We build silence Acoustic aterials: Characterization ecanum Inc. info@mecanum.com www.mecanum.com otivation Sound quality in vehicles starts at the design stage odels are used to simulate the acoustics

More information

Prediction of Transformer Core Noise

Prediction of Transformer Core Noise Prediction of Transformer Core Noise R. Haettel *,1, M. Kavasoglu 1, A. Daneryd 1 and C. Ploetner 2 1 ABB Corporate Research Sweden, 2 ABB Transformers Canada *Corresponding author: 721 78 Västerås Sweden,

More information

UNIVERSITY OF SASKATCHEWAN Department of Physics and Engineering Physics

UNIVERSITY OF SASKATCHEWAN Department of Physics and Engineering Physics UNIVERSITY OF SASKATCHEWAN Department of Physics and Engineering Physics Physics 117.3 MIDTERM TEST Time: 90 minutes NAME: (Last) Please Print (Given) STUDENT NO.: LECTURE SECTION (please check): INSTRUCTIONS:

More information

Experimental Study and Analysis of Flow Induced Vibration in a pipeline

Experimental 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 information

FEM/FMBEM coupling for acoustic structure interaction and acoustic design sensitivity analysis with sound-absorbing materials

FEM/FMBEM coupling for acoustic structure interaction and acoustic design sensitivity analysis with sound-absorbing materials Boundary Elements and Other Mesh Reduction Methods XXXVIII 113 FEM/FMBEM coupling for acoustic structure interaction and acoustic design sensitivity analysis with sound-absorbing materials Y. M. Xu, H.

More information

F.M. with Finite Element analysis - Different calculation techniques + Numerical examples (ANSYS Apdl) 2/2

F.M. with Finite Element analysis - Different calculation techniques + Numerical examples (ANSYS Apdl) 2/2 Task 6 - Safety Review and Licensing On the Job Training on Stress Analysis F.M. with Finite Element analysis - Different calculation techniques + Numerical examples (ANSYS Apdl) 2/2 Davide Mazzini Ciro

More information

Mechatronic design optimisation of subwoofer system. P6-project spring 2010 Group MCE6-621

Mechatronic design optimisation of subwoofer system. P6-project spring 2010 Group MCE6-621 Mechatronic design optimisation of subwoofer system P6-project spring 2010 Group MCE6-621 Title: Mechatronic design optimisation of subwoofer system Semester: 6th semester 2010 Semester theme: Mechatronic

More information

TR A Comparison of the Performance of SaP::GPU and Intel s Math Kernel Library (MKL) for Solving Dense Banded Linear Systems

TR A Comparison of the Performance of SaP::GPU and Intel s Math Kernel Library (MKL) for Solving Dense Banded Linear Systems TR-0-07 A Comparison of the Performance of ::GPU and Intel s Math Kernel Library (MKL) for Solving Dense Banded Linear Systems Ang Li, Omkar Deshmukh, Radu Serban, Dan Negrut May, 0 Abstract ::GPU is a

More information

Comparative study between random vibration and linear static analysis using Miles method for thruster brackets in space structures

Comparative study between random vibration and linear static analysis using Miles method for thruster brackets in space structures Comparative study between random vibration and linear static analysis using Miles method for thruster brackets in space structures Ion DIMA*,1, Cristian-Gheorghe MOISEI 1, Calin-Dumitru COMAN 1, Mihaela

More information

Basics of Sound and Noise. David Herrin, Ph.D., P.E. University of Kentucky Department of Mechanical Engineering

Basics of Sound and Noise. David Herrin, Ph.D., P.E. University of Kentucky Department of Mechanical Engineering Basics of Sound and Noise David Herrin, Ph.D., P.E. Department of Mechanical Engineering Ø Public University Ø 16 Colleges Ø 93 Undergraduate Programs Ø 99 M.S. Programs Ø 66 Ph.D. Programs Ø 28,000 Students

More information

DISPENSA FEM in MSC. Nastran

DISPENSA FEM in MSC. Nastran DISPENSA FEM in MSC. Nastran preprocessing: mesh generation material definitions definition of loads and boundary conditions solving: solving the (linear) set of equations components postprocessing: visualisation

More information

Finite element simulation of surface plasmon-polaritons: generation by edge effects, and resonance

Finite element simulation of surface plasmon-polaritons: generation by edge effects, and resonance 1 Matthias Maier May 18, Finite2017 element simulation of SPPs: edge effects and resonance Finite element simulation of surface plasmon-polaritons: generation by edge effects, and resonance Matthias Maier

More information

Boundary element methods in the prediction of the acoustic damping of ship whipping vibrations

Boundary element methods in the prediction of the acoustic damping of ship whipping vibrations ANZIAM J. 45 (E) ppc845 C856, 2004 C845 Boundary element methods in the prediction of the acoustic damping of ship whipping vibrations D. S. Holloway G. A. Thomas M. R. Davis (Received 8 August 2003) Abstract

More information

Finite element method based analysis and modeling in rotordynamics

Finite element method based analysis and modeling in rotordynamics Finite element method based analysis and modeling in rotordynamics A thesis submitted to the Graduate School of the University of Cincinnati in partial fulfillment of the requirements for the degree of

More information

Sound Propagation in the Nocturnal Boundary Layer. Roger Waxler Carrick Talmadge Xiao Di Kenneth Gilbert

Sound Propagation in the Nocturnal Boundary Layer. Roger Waxler Carrick Talmadge Xiao Di Kenneth Gilbert Sound Propagation in the Nocturnal Boundary Layer Roger Waxler Carrick Talmadge Xiao Di Kenneth Gilbert The Propagation of Sound Outdoors (over flat ground) The atmosphere is a gas under the influence

More information

Towards Rotordynamic Analysis with COMSOL Multiphysics

Towards Rotordynamic Analysis with COMSOL Multiphysics Towards Rotordynamic Analysis with COMSOL Multiphysics Martin Karlsson *1, and Jean-Claude Luneno 1 1 ÅF Sound & Vibration *Corresponding author: SE-169 99 Stockholm, martin.r.karlsson@afconsult.com Abstract:

More information

Transmission loss of rectangular silencers using meso-porous and micro-perforated linings

Transmission loss of rectangular silencers using meso-porous and micro-perforated linings Transmission loss of rectangular silencers using meso-porous and micro-perforated linings T.E.Vigran Acoustic Group, Department of Electronics and Telecommunications, Norwegian University of Science and

More information

Lecture 10 Multistep Analysis

Lecture 10 Multistep Analysis Lecture 10 Multistep Analysis 16.0 Release Introduction to ANSYS Mechanical 1 2015 ANSYS, Inc. February 27, 2015 Chapter Overview In this chapter, aspects of reviewing results will be covered: A. Multistep

More information

SPACECRAFT EQUIPMENT VIBRATION QUALIFICATION TESTING APPLICABILITY AND ADVANTAGES OF NOTCHING

SPACECRAFT EQUIPMENT VIBRATION QUALIFICATION TESTING APPLICABILITY AND ADVANTAGES OF NOTCHING SPACECRAFT EQUIPMENT VIBRATION QUALIFICATION TESTING APPLICABILITY AND ADVANTAGES OF NOTCHING Andrea Ceresetti Alenia Spazio S.p.A. - Technical Directorate Strada Antica di Collegno 53, 46 TORINO, Italy

More information

Numerical Investigation of Vortex Induced Vibration of Two Cylinders in Side by Side Arrangement

Numerical Investigation of Vortex Induced Vibration of Two Cylinders in Side by Side Arrangement Numerical Investigation of Vortex Induced Vibration of Two Cylinders in Side by Side Arrangement Sourav Kumar Kar a, 1,, Harshit Mishra a, 2, Rishitosh Ranjan b, 3 Undergraduate Student a, Assitant Proffessor

More information

Chapter 23: Principles of Passive Vibration Control: Design of absorber

Chapter 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 information

Dr. N.V.Srinivasulu, S.Jaikrishna, A.Navatha

Dr. N.V.Srinivasulu, S.Jaikrishna, A.Navatha PSD Analysis of an Automobile Dash Panel Dr. N.V.Srinivasulu, S.Jaikrishna, A.Navatha Abstract:-In this paper, PSD analysis of an automobile dash panel is performed in order to reduce the vibrations that

More information

DESIGN AND ANALYSIS OF VIBRATION AND HARSHNESS CONTROL FOR AUTOMOTIVE STRUCTURES USING FINITE ELEMENT ANALYSIS

DESIGN AND ANALYSIS OF VIBRATION AND HARSHNESS CONTROL FOR AUTOMOTIVE STRUCTURES USING FINITE ELEMENT ANALYSIS International Journal of Civil Engineering and Technology (IJCIET) Volume 8, Issue 10, October 2017, pp. 1364 1370, Article ID: IJCIET_08_10_139 Available online at http://http://www.iaeme.com/ijciet/issues.asp?jtype=ijciet&vtype=8&itype=10

More information

Simplorer and Mechanical. David Twyman Technical Services

Simplorer and Mechanical. David Twyman Technical Services Simplorer and Mechanical David Twyman Technical Services 1 Overview Simplorer Architecture, Methodology and Operation Simplorer and Mechanical Rigid Body Dynamics to Mechanical Link (Cosimulation) Mechanical

More information

CONTINUED-FRACTION ABSORBING BOUNDARY CONDITIONS FOR THE WAVE EQUATION

CONTINUED-FRACTION ABSORBING BOUNDARY CONDITIONS FOR THE WAVE EQUATION Journal of Computational Acoustics, Vol. 8, No. 1 (2) 139 156 c IMACS CONTINUED-FRACTION ABSORBING BOUNDARY CONDITIONS FOR THE WAVE EQUATION MURTHY N. GUDDATI Department of Civil Engineering, North Carolina

More information

Sound radiation from the open end of pipes and ducts in the presence of mean flow

Sound radiation from the open end of pipes and ducts in the presence of mean flow Sound radiation from the open end of pipes and ducts in the presence of mean flow Ray Kirby (1), Wenbo Duan (2) (1) Centre for Audio, Acoustics and Vibration, University of Technology Sydney, Sydney, Australia

More information

Effect of effective length of the tube on transmission loss of reactive muffler

Effect of effective length of the tube on transmission loss of reactive muffler Effect of effective length of the tube on transmission loss of reactive muffler Gabriela Cristina Cândido da SILVA 1 ; Maria Alzira de Araújo NUNES 1 1 University of Brasilia, Brazil ABSTRACT Reactive

More information

Aero-Acoustic assessment of installed propellers

Aero-Acoustic assessment of installed propellers Aero-Acoustic assessment of installed propellers Marius Gabriel COJOCARU*,1, Mihai Leonida NICULESCU 1, Mihai Victor PRICOP 1 *Corresponding author *,1 INCAS National Institute for Aerospace Research Elie

More information

Control of Earthquake Induced Vibrations in Asymmetric Buildings Using Passive Damping

Control of Earthquake Induced Vibrations in Asymmetric Buildings Using Passive Damping Control of Earthquake Induced Vibrations in Asymmetric Buildings Using Passive Damping Rakesh K. Goel, California Polytechnic State University, San Luis Obispo Abstract This paper summarizes the results

More information

Efficient boundary element analysis of periodic sound scatterers

Efficient boundary element analysis of periodic sound scatterers Boundary Element and Meshless Methods in Acoustics and Vibrations: Paper ICA2016-418 Efficient boundary element analysis of periodic sound scatterers M. Karimi, P. Croaker, N. Kessissoglou 1 School of

More information

Practical Combustion Kinetics with CUDA

Practical Combustion Kinetics with CUDA Funded by: U.S. Department of Energy Vehicle Technologies Program Program Manager: Gurpreet Singh & Leo Breton Practical Combustion Kinetics with CUDA GPU Technology Conference March 20, 2015 Russell Whitesides

More information

Progress in Parametric Model Reduction. J. Mohring, Paris,

Progress in Parametric Model Reduction. J. Mohring, Paris, Progress in Parametric Model Reduction J. Mohring, Paris, 15.12.2009 Overview Need for parametric model reduction Optimal H 2 controller for LMS concrete car benchmark The LBF acoustic aquarium Numerical

More information

STAR-CCM+: NACA0012 Flow and Aero-Acoustics Analysis James Ruiz Application Engineer January 26, 2011

STAR-CCM+: NACA0012 Flow and Aero-Acoustics Analysis James Ruiz Application Engineer January 26, 2011 www.cd-adapco.com STAR-CCM+: NACA0012 Flow and Aero-Acoustics Analysis James Ruiz Application Engineer January 26, 2011 Introduction The objective of this work is to prove the capability of STAR-CCM+ as

More information

Accurate Determination of Loudspeaker Parameters using Audio Analyzer Type 2012 and Laser Velocity Transducer Type 3544

Accurate Determination of Loudspeaker Parameters using Audio Analyzer Type 2012 and Laser Velocity Transducer Type 3544 7/6-'89 Application Note Accurate Determination of Loudspeaker Parameters using Audio Analyzer Type 202 and Laser Velocity Transducer Type 3544 by Søren Jønsson, Brüel & Kjær, Denmark A method to determine

More information

ANSYS Explicit Dynamics Update. Mai Doan

ANSYS Explicit Dynamics Update. Mai Doan ANSYS Explicit Dynamics Update Mai Doan Mai.Doan@ansys.com +1 512 687 9523 1/32 ANSYS Explicit Dynamics Update Outline Introduction Solve Problems that were Difficult or Impossible in the Past Structural

More information

inter.noise 2000 The 29th International Congress and Exhibition on Noise Control Engineering August 2000, Nice, FRANCE

inter.noise 2000 The 29th International Congress and Exhibition on Noise Control Engineering August 2000, Nice, FRANCE Copyright SFA - InterNoise 2000 1 inter.noise 2000 The 29th International Congress and Exhibition on Noise Control Engineering 27-30 August 2000, Nice, FRANCE I-INCE Classification: 2.0 TLM MODEL FOR SOUND

More information

Efficient calculation for evaluating vast amounts of quadrupole sources in BEM using fast multipole method

Efficient calculation for evaluating vast amounts of quadrupole sources in BEM using fast multipole method PROCEEDINGS of the 22 nd International Congress on Acoustics Boundary Element and Meshless Methods on Acoustics and Vibrations: Paper ICA2016-309 Efficient calculation for evaluating vast amounts of quadrupole

More information

SPECIAL DYNAMIC SOIL- STRUCTURE ANALYSIS PROCEDURES DEMONSTATED FOR TWO TOWER-LIKE STRUCTURES

SPECIAL DYNAMIC SOIL- STRUCTURE ANALYSIS PROCEDURES DEMONSTATED FOR TWO TOWER-LIKE STRUCTURES 2010/2 PAGES 1 8 RECEIVED 21. 9. 2009 ACCEPTED 20. 1. 2010 Y. KOLEKOVÁ, M. PETRONIJEVIĆ, G. SCHMID SPECIAL DYNAMIC SOIL- STRUCTURE ANALYSIS PROCEDURES DEMONSTATED FOR TWO TOWER-LIKE STRUCTURES ABSTRACT

More information

Coupling atomistic and continuum modelling of magnetism

Coupling atomistic and continuum modelling of magnetism Coupling atomistic and continuum modelling of magnetism M. Poluektov 1,2 G. Kreiss 2 O. Eriksson 3 1 University of Warwick WMG International Institute for Nanocomposites Manufacturing 2 Uppsala University

More information