Acoustic Applications in Mechanical Engineering: StructureBorne Sound versus AirBorne Sound


 Vivien Curtis
 2 years ago
 Views:
Transcription
1 Acoustic Applications in Mechanical Engineering: StructureBorne Sound versus AirBorne Sound Marold Moosrainer CADFEM GmbH 2009 July 6th
2 Agenda Introduction into acoustics: common phrases, basic equation Solving structural vibration problems with ANSYS Solving structureborne sound problems with ANSYS SBSOUND Solving airborne sound problems with ANSYS (FEM) Solving airborne sound problems with WAON (BEM) 1
3 Introduction machine acoustics speed of sound, wavelength, frequency basic concept of solving acoustic problems by simulation 2
4 Some phrases of machine acoustics machine fluid, e.g. air transient flow direct noise generation: flow acoustics (CFD + acou.) oscillating forces machine structure indirect noise generation: vibroacoustics (FEM + acou.) building structure structureborne sound: a sound wave propagating in a solid medium airborne sound: a sound wave propagating in air 3
5 Speed of sound wavelength frequency Note that we solve the acoustic wave equation to model reflection, scattering, absorption and thus we have to resolve each wave in its spatial pattern important equation: c = λ f air: c 340m/s, f=1000hz λ=0.34m water: c 1500m/s, f=1000hz λ=1.5m rule of thumb FEM, BEM: linear elements per wavelength required elements for a domain of characteristic size a: FEM (volume mesh): ~O(N 3 ) BEM (surface mesh): ~O(N 2 ) large acoustic FEM problem: 10M DOFs large acoustic BEM problem: 20k DOFs large acoustic FMBEM problem: 200k DOFs 4
6 Basic concept of solving acoustic problems by simulation Signal analysis (MBS, test, FFT) Structureborne sound analysis (FEM) Airborne sound analysis (FEM, BEM) Psycho acoustics (e.g. DIN 45631) use N 5 percentile values for transient noise 5
7 Solving Structural Vibration Problems with ANSYS modal analysis harmonic response analysis ANSYS application example: train wheel 6
8 Solving structural vibration problems with ANSYS modal analysis: standard procedure for the dynamic assessment of a structure compute the potential vibration shapes & resonance frequencies of a structure without considering any excitation a library of specific solvers for special tasks: standard: block Lanczos (LANB), large problems: PCG Lanczos (LANPCG) large problems, up to modes (SNODE) rotordynamics: incl. gyroscopic effects (QRDAMP) damped structures: incl. damping matrix (QRDAMP, DAMP) breaksqueal analysis: incl. friction (QRDAMP,UNSYM) FSI coupled systems: incl. fluid (UNSYM) however: no amplitude results 7
9 Modal analysis: mode shapes of a train wheel
10 Solving structural vibration problems with ANSYS harmonic response analysis now we introduce an excitation, for instance a point force F=1N specified over a frequency range Hz only distinct modes will contribute to the structural response, e.g. the modes having a nodal line at the excitation point will not be excited use mode superposition instead of inverting full matrices whenever possible because of efficiency usually the response amplitude at some points is postprocessedversus frequency 9
11 Frequency response UY(f) at contact point 10 
12 Solving StructureBorne Sound Problems with ANSYS SBSOUND basic equation of machinery acoustics ANSYS application example: train wheel 11
13 Computation of structureborne sound Acoustics is driven by velocity v=iωu not by structural displacement u. Acoustics assumes an ideal nonviscous fluid without shear layers. Thus only the surface normal component of the structural vibration velocity is important. Acoustics is not a local phenomenon like fatigue where we have to deal with local notch stresses. Acoustics is a global phenomenon where the whole structure may contribute to sound radiation. thus let s try to get one integral quantity to describe the acoustic fingerprint of a structure by simply averaging the normal surface velocities For all this ideas apply the basic equation of machinery acoustics (cf. textbooks) ~ f ) 2 n P( = ρ cσ ( f ) A< v~ ( f ) > 12 
14 ANSYS macro library SBSOUND (structureborne sound) Perform normal projection of the displacement results Compute surface averaged mean square velocity by integration Do all computations in modal subspace for higher efficiency and extended postprocessing capabilities (modal contribution plot, panel contribution plot) modal contributions show the influence of distinct modes
15 Alternatively: bar chart of modal contributions for fixed f total result (red bar) together with the (blue) modal contributions the same figure is available for panel contributions if panels are defined before calling SBSOUND 14 
16 Sound radiation is not only a function of velocity amplitude! Sound pressure p for two plates vibrating in the same spatial pattern, both with equal velocity amplitude v 0 but with different frequencies. There is, however, a big difference in the sound radiation! Radiation efficiency s! at 50 Hz and at 200 Hz note the equal pressure scale 15 
17 Solving AirBorne Sound Problems with ANSYS (FEM) interior frequency domain acoustic FEM: living room exterior acoustics time domain FEM: offshore hammer 16 
18 Interior acoustics: modal analysis by ANSYS FEM living room with defined absorbent linings: mode 2 at 28 Hz (right) mode 50 at 152 Hz (left) 17 
19 Exterior acoustics: transient analysis by ANSYS FEM Offshore hammer: for offshore applications a steel pipe has to be fixed in shallow sea water. The pile has a length of 30m above sea ground, a radius of 2m, and a wall thickness of 50mm; halfsin force FY 1E8N. It s partially immersed in water (water height 25m), where the speed of sound c=1500m/s, and fluid density ρ=1000kg/m 3, apply absorbent boundary condition at exterior surfaces pipe exterior fluid interior fluid 18 
20 Results: animated displacement u and sound pressure p Structural result pipe displacement radial component important Acoustic result sound pressure animation sound pressure signals at different microphone positions P 19 
21 Solving AirBorne Sound Problems with WAON (BEM) features of BEM and FMBEM FMBEM workflow for train wheel example ANSYS Workbench WAON interface 20 
22 Computation of airborne sound (typical BEM workflow) 1. structural FE model 2. modal model (FEM): eigenfrequencies, mode shapes, modal damping 3. Harmonic frequency (FEM) response results (structureborne sound): surface displacements 4. Acoustic BEM solves wave equation, no fluid volume mesh required. a) BEM result: sound pressure p, sound power P, radiation efficiency σ b) field point mesh result (half sphere): sound pressure p, intensity I 21 
23 Compare FEM & BEM before talking about the new development FMBEM let s have a more general view on BEM BEM FEM BEM: divide only the surface. easy to create a mesh. The sound radiation problem can be handled completely no need for any particular boundary condition like in FEM for exterior acoustic problems Interior Exterior Interior Exterior 22 
24 Acoustics Software: & WAON specialized acoustic software for efficient frequency domain sol. technology based on Fast Multipole BoundayElement Method (FMBEM), a state of the art numerical technology pro s easy to learn (24 hours or even a seminar by WEBEX is sufficient) easy to apply even if acoustics isn t your every day business easy mesh operations surface mesh of your radiating structure is sufficient low memory requirements, high performance, high frequencies (comp. to BEM): e.g. automotive sensor applications at ultrasonic frequencies very efficient (park distance control, alarm) 23 
25 What is FMBEM Fast Multipole algorithm is applied to the boundary element method (BEM) The world's first commercial acousticanalysis program with using FMBEM Accuracy is the same as conventional BEM Conventional BEM FMBEM Calculation of interaction between all elements Memory requirement O(N 2 ) Solution time O(N 3 ) : direct solver O(N 2 ) : iterative solver Calculation of interaction between cells instead of between elements (maths: clustering&multipoleexpansion) Solution time O(N ~ N logn) Memory requirement O(N ~ N logn) 24 
26 Engine: Conventional BEM vs. FMBEM Available on larger structures and higher frequency at shorter times! Radiated noise from engine Pressure or output power distribution around scooter engine. 4.5 khz analysis by 84,000 DOF mesh. Required memory(4.5khz) Conventional BEM : 113 GB FMBEM by WAON : 3 GB 25 
27 Compare FEM & BEM FEM acoustics large amount of data particularly for large distance results or scatter objects volume meshes: prep/post efforts developer: easy math, user: more effort to handle nonreflecting boundary conditions like FLUID130, perfectly matching layer (PML) for radiation problems strong in both frequency & time domain modal analysis available nonhomogeneous acoustic media porous media (foam) available (Biot theory) nonlinearities available (large amplitudes) convectedwave eq. for flow eff. available BEM acoustics reduced amount of data even for large distance results surface meshes: easy prep/post, less data developer: complex math, user: more easy to handle radiation problem solved very naturally because every boundary element knows about the radiation cond. analytically only strong in frequency domain no modal analysis available acoustic medium has to be homogeneous volomedamping idealized by complex c confined to linear theory quiescent acoustic medium 26 
28 ANSYS/WAON workflow: airborne sound train wheel example reloaded Prepare WAON BEM (surface) mesh in ANSYS and export it to CDB formats prepare WAON field point mesh (virtual microphones) in ANSYS and export it to CDB format 27 
29 Import BEM mesh & map ANSYS structural vibration results WAON feature tree (max. 7 dialogues to work through intuitively) 28 
30 Import field point mesh (virtual microphones) & perform FMBEM harmonic response analysis (23 min.) 29 
31 Postprocess pressure amplitude & pressure level in db & intensity vectors on field point mesh 30 
32 Compare airborne power to structureborne sound power blue curve: input power (structureborne sound power identical to SBSOUND result) due to radiation efficiency σ this always is a very conservative estimate of the radiated active output power in red (airborne sound power) good agreement at higher frequencies above coincidence where we have radiation efficiency σ=
33 Even more Easy to Use: Interface WBtoWAON Developed by CYBERNET SYSTEMS WBtoWAON Developed by CYBERNET SYSTEMS WAON ANSYS Workbench Developed by ANSYS, Inc
34 WAON: some more solved acoustic applications Sound Pressure Level[dB] Point1 Point2 Point Frequency[kHz] 33 
35 Multiphysics: FEM/FEM/BEM application example Investigation of the Noise Behavior of an Electric Motor electromagnetics struct. vibrations Structure: Single phase alternating current electric motor acoustics Task: Simulate noise behavior for silent operation Method: Coupled electromechanic, structuraldynamic and acoustic analysis Schallleistungspegel [db] f [Hz] 34 
36 Conclusion ANSYS FEM for structural vibration analysis, multiphysics analysis (e.g. electromagnetic excitation) SBSOUND (ANSYS macro library provided by CADFEM) for a quick rough structureborne sound assessment WAON for really doing fullyfledged acoustic simulations FMBEM is a very comfortable technique particularly for the new user because there is no need for volume meshing like in acoustic FEM FMBEM technique overcomes the traditional drawback of conventional BEM: matrix storage requirements & large CPU time due to direct solvers. Highspeed iterative solvers available. FMBEM by WAON allows the analysis of large scale models & high frequencies acoustics is easy acoustics is fun! 35 
Acoustics Analysis of Speaker
Acoustics Analysis of Speaker 1 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
More informationCONSTRUCTION MACHINERY CAB VIBROACOUSTIC ANALYSIS AND OPTIMISATION
CONSTRUCTION MACHINERY CAB VIBROACOUSTIC ANALYSIS AND OPTIMISATION L.Bregant 1, G.Miccoli 2, M.Seppi 1 1 University of Trieste, Dept. of Mechanical Engineering, Trieste, Italy 2 IMAMOTER Institute, National
More informationFinite Element Analysis for Acoustic Behavior of a Refrigeration Compressor
Finite Element Analysis for Acoustic Behavior of a Refrigeration Compressor Swapan Kumar Nandi Tata Consultancy Services GEDC, 185 LR, Chennai 600086, India Abstract When structures in contact with a fluid
More informationFluid structure interaction of a vibrating circular plate in a bounded fluid volume: simulation and experiment
Fluid Structure Interaction VI 3 Fluid structure interaction of a vibrating circular plate in a bounded fluid volume: simulation and experiment J. Hengstler & J. Dual Department of Mechanical and Process
More informationDispersion diagrams of a waterloaded cylindrical shell obtained from the structural and acoustic responses of the sensor array along the shell
Dispersion diagrams of a waterloaded cylindrical shell obtained from the structural and acoustic responses of the sensor array along the shell B.K. Jung ; J. Ryue ; C.S. Hong 3 ; W.B. Jeong ; K.K. Shin
More informationA new generalized approach to Statistical Energy Analysis (SEA)
A new generalized approach to Statistical Energy Analysis (SEA) Phil SHORTER 1, Vincent COTONI 1, Julien LEGAULT 1, Robin LANGLEY 2, Stephane CARO 1 1 wave six LLC. 2 University of Cambridge, United Kingdom
More informationOverview. also give you an idea of ANSYS capabilities. In this chapter, we will define Finite Element Analysis and. Topics covered: B.
2. FEA and ANSYS FEA and ANSYS Overview In this chapter, we will define Finite Element Analysis and also give you an idea of ANSYS capabilities. Topics covered: A. What is FEA? B. About ANSYS FEA and ANSYS
More informationDesign of Cellular Composite for Vibration and Noise Control: Effects of Inclusions and Filling Patterns on Acoustic Bandgap
Design of Cellular Composite for Vibration and Noise Control: Effects of Inclusions and Filling Patterns on Acoustic Bandgap Vijay Kumar and D. Roy Mahapatra Department of Aerospace Engineering Indian
More informationFLUID STRUCTURE INTERACTION TO PREDICT LINER VIBRATIONS IN AN INDUSTRIAL COMBUSTION SYSTEM
FLUID STRUCTURE INTERACTION TO PREDICT LINER VIBRATIONS IN AN INDUSTRIAL COMBUSTION SYSTEM Rob A. Huls, Jaap F. van Kampen, Jim B.W. Kok and André de Boer University of Twente P.O. Box 217, 75 AE Enschede,
More informationFluidStructure Acoustic Analysis with Bidirectional Coupling and Sound Transmission
VPE Swiss Workshop Acoustic Simulation 12. Sept. 2013 FluidStructure Acoustic Analysis with Bidirectional Coupling and Sound Transmission Reinhard Helfrich INTES GmbH, Stuttgart info@intes.de www.intes.de
More informationAeroacoustic Analogy for the Computation of Aeroacoustic Fields in Partially Closed Domains
INSTITUT FÜR MECHANIK UND MECHATRONIK Messtechnik und Aktorik Aeroacoustic Analogy for the Computation of Aeroacoustic Fields in Partially Closed Domains A. Hüppe 1, M. Kaltenbacher 1, A. Reppenhagen 2,
More informationAcoustic analysis of an induction motor with viscoelastic bearing supports. Abstract. 1. Introduction
The 2002 International Congress and Exposition on Noise Control Engineering Dearborn, MI, USA. August 1921, 2002 Acoustic analysis of an induction motor with viscoelastic bearing supports H.G. Tillema
More informationTitelmasterformat durch Klicken bearbeiten
Titelmasterformat durch Klicken bearbeiten ANSYS AIM Product simulation for every engineer Erke Wang CADFEM GmbH Georg Scheuerer ANSYS Germany GmbH Christof Gebhardt CADFEM GmbH All products involve multiple
More informationStructural and Thermal Analysis of Brake Drum
MiddleEast Journal of Scientific Research 0 (8): 1011016, 014 ISSN 1990933 IDOSI Publications, 014 DOI: 10.589/idosi.mejsr.014.0.08.11404 Structural and Thermal Analysis of Brake Drum Anup Kumar and
More informationCHAPTER 4 4 NUMERICAL ANALYSIS
41 CHAPTER 4 4 NUMERICAL ANALYSIS Simulation is a powerful tool that engineers use to predict the result of a phenomenon or to simulate the working situation in which a part or machine will perform in
More information3D WAVEGUIDE MODELING AND SIMULATION USING SBFEM
3D WAVEGUIDE MODELING AND SIMULATION USING SBFEM Fabian Krome, Hauke Gravenkamp BAM Federal Institute for Materials Research and Testing, Unter den Eichen 87, 12205 Berlin, Germany email: Fabian.Krome@BAM.de
More informationChapter 15 Wave Motion. Copyright 2009 Pearson Education, Inc.
Chapter 15 Wave Motion Characteristics of Wave Motion Types of Waves: Transverse and Longitudinal Energy Transported by Waves Mathematical Representation of a Traveling Wave The Wave Equation Units of
More informationHigh Performance Computing: A Review of Parallel Computing with ANSYS solutions. Efficient and Smart Solutions for Large Models
High Performance Computing: A Review of Parallel Computing with ANSYS solutions Efficient and Smart Solutions for Large Models 1 Use ANSYS HPC solutions to perform efficient design variations of large
More informationWaves. Wave: A traveling disturbance consisting of coordinated vibrations that transmit energy with no net movement of the matter.
Waves Wave: A traveling disturbance consisting of coordinated vibrations that transmit energy with no net movement of the matter. Source: some kind of disturbance from the state of equilibrium. Propagation:
More informationCAD and Finite Element Analysis
CAD and Finite Element Analysis Most ME CAD applications require a FEA in one or more areas: Stress Analysis Thermal Analysis Structural Dynamics Computational Fluid Dynamics (CFD) Electromagnetics Analysis...
More informationThe Sonometer The Resonant String and Timbre Change after plucking
The Sonometer The Resonant String and Timbre Change after plucking EQUIPMENT Pasco sonometers (pick up 5 from teaching lab) and 5 kits to go with them BK Precision function generators and Tenma oscilloscopes
More informationphysics 111N oscillations & waves
physics 111N oscillations & waves periodic motion! often a physical system will repeat the same motion over and over! we call this periodic motion, or an oscillation the time it takes for the motion to
More information7.1 Echo sounders. Principle of proximity sensor 1. PZT 2. matching layer 3. metal ring 4. radiation. Trade mark of Siemens A.G.
7 COMBINED APPLICATIONS The designs described in this section. use PZT transducers both as a transmitter and a receiver, clearly demonstrating the reversible nature of the piezoelectric effect. Typical
More informationEFFECTS OF TRIM AND TRIM MODELING ON INCAB NOISE
The 21 st International Congress on Sound and Vibration 1317 July, 2014, Beijing/China EFFECTS OF TRIM AND TRIM MODELING ON INCAB NOISE Chavan Achyut, Raut Manoj and R Ramkumar. College of Engineering
More informationAdvancements in Laser Doppler Vibrometry for Ultrasonic Applications. Ultrasonics Industry Symposium Eric Lawrence, Polytec Inc.
Advancements in Laser Doppler Vibrometry for Ultrasonic Applications Ultrasonics Industry Symposium Eric Lawrence, Polytec Inc. Contents Introduction to Laser Vibrometry New PSV500 Scanning Vibrometer
More informationPiezoelectric Simulations
Piezoelectric Simulations Outline Overview Examples Relevant Products Useful Features Overview Industries Using Piezoelectric Devices Aerospace Oil & Gas Automotive Piezoelectric Devices MEMS Acoustics
More informationLab 14: Standing Waves
Lab 14: Standing Waves Objectives: To understand superposition of waves To understand how a standing wave is created To understand relationships between physical parameters such as tension and length of
More informationLaboratory facilities for sound transmission measurements validation by measurement and simulation methods
Laboratory facilities for sound transmission measurements validation by measurement and simulation methods Marlon MEISSNITZER 1 ; Blasius BUCHEGGER 2 ; Heinz FERK 3 1, 2, 3 Graz University of Technology,
More informationBest practices for efficient HPC performance with large models
Best practices for efficient HPC performance with large models Dr. Hößl Bernhard, CADFEM (Austria) GmbH PRACE Autumn School 2013  Industry Oriented HPC Simulations, September 2127, University of Ljubljana,
More informationSound Insulation of Walls with a new MortarMix System
Sound Insulation of Walls with a new MortarMix System Martin Schneider, HeinzMartin Fischer Stuttgart University of Applied Sciences, Germany. Summary A new clay block walling system developed by the
More informationOpenFOAM Optimization Tools
OpenFOAM Optimization Tools Henrik Rusche and Aleks Jemcov h.rusche@wikkigmbh.de and a.jemcov@wikki.co.uk Wikki, Germany and United Kingdom OpenFOAM Optimization Tools p. 1 Agenda Objective Review optimisation
More informationThe simulation of machine tools can be divided into two stages. In the first stage the mechanical behavior of a machine tool is simulated with FEM
1 The simulation of machine tools can be divided into two stages. In the first stage the mechanical behavior of a machine tool is simulated with FEM tools. The approach to this simulation is different
More informationMULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
Exam Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) A transverse wave is propagated in a string stretched along the xaxis. The equation
More informationA. Ricci, E. Giuri. Materials and Microsystems Laboratory
Presented at the COMSOL Conference 2009 Milan FSI Analysis of Microcantilevers Vibrating in Fluid Environment Materials and Microsystems Laboratory Politecnico di Torino Outline Brief Presentation of Materials
More informationVibration reduction of thermal break balcony connections
Vibration reduction of thermal break balcony connections M. Schneider and H.M. Fischer University of Applied Sciences, Schellingstr. 24, 70174 Stuttgart, Germany martin.schneider@hftstuttgart.de 5405
More information11 Vibration Analysis
11 Vibration Analysis 11.1 Introduction A spring and a mass interact with one another to form a system that resonates at their characteristic natural frequency. If energy is applied to a spring mass system,
More informationRealistic Simulation of a Flexible Mechanism using ANSYS Solutions. Achuth Rao, Ph.D. Product Line Manager Product Management Group ANSYS Inc.
Realistic Simulation of a Flexible Mechanism using ANSYS Solutions Achuth Rao, Ph.D. Product Line Manager Product Management Group ANSYS Inc. Solution Brands and Products Structural Fluids Explicit ANSYS/Mechanical
More informationDrive marketwinning innovation, without risk
SOLIDWORKS SIMULATION Drive marketwinning innovation, without risk Ensure adequate exit duct sizing with Flow simulation Check resonance between the fan and the motor Truck Mount SnowBlower Wausau Everest
More informationSound Waves. PHYS102 Previous Exam Problems CHAPTER. Sound waves Interference of sound waves Intensity & level Resonance in tubes Doppler effect
PHYS102 Previous Exam Problems CHAPTER 17 Sound Waves Sound waves Interference of sound waves Intensity & level Resonance in tubes Doppler effect If the speed of sound in air is not given in the problem,
More informationAeroelastic Investigation of the Sandia 100m Blade Using Computational Fluid Dynamics
Aeroelastic Investigation of the Sandia 100m Blade Using Computational Fluid Dynamics David Corson Altair Engineering, Inc. Todd Griffith Sandia National Laboratories Tom Ashwill (Retired) Sandia National
More informationMEMS Multiphysics Simulation in ANSYS Workbench David Harrar II, PhD Ozen Engineering, Inc.
MEMS Multiphysics Simulation in ANSYS Workbench David Harrar II, PhD Ozen Engineering, Inc. 1 Ozen Engineering, Inc. We are the local ANSYS Channel Partner With over 25 years of experience in FEA and CFD
More informationCommercial CFD Software Modelling
Commercial CFD Software Modelling Dr. Nor Azwadi bin Che Sidik Faculty of Mechanical Engineering Universiti Teknologi Malaysia INSPIRING CREATIVE AND INNOVATIVE MINDS 1 CFD Modeling CFD modeling can be
More informationGuidelines to engine dynamics and vibration
The Ship Power Supplier Guidelines to engine dynamics and vibration by Hannu Tienhaara Technology Wärtsilä Corporation In recent years shipyards and shipowners have increasingly tuned in to the negative
More informationVincent Constantin, CADFEM (Suisse) AG
Fast Titelmasterformat and reliable Bolt durch Assessment Klicken bearbeiten inside ANSYS Vincent Constantin, CADFEM (Suisse) AG Agenda Introduction VDI 2230 Bolt Assessment inside ANSYS Verification Examples
More informationDYNAMICAL ANALYSIS OF SILO SURFACE CLEANING ROBOT USING FINITE ELEMENT METHOD
International Journal of Mechanical Engineering and Technology (IJMET) Volume 7, Issue 1, JanFeb 2016, pp. 190202, Article ID: IJMET_07_01_020 Available online at http://www.iaeme.com/ijmet/issues.asp?jtype=ijmet&vtype=7&itype=1
More informationVIBRATION DUE TO ROTATION UNBALANCE
Fall 08 Prepared by: Keivan Anbarani Abstract In this experiment four eccentric masses are used in conjunction with four springs and one damper to simulate the vibration. Masses are aligned in different
More informationHigh Performance Computing for Mechanical Simulations using ANSYS. Jeff Beisheim ANSYS, Inc
High Performance Computing for Mechanical Simulations using ANSYS Jeff Beisheim ANSYS, Inc HPC Defined High Performance Computing (HPC) at ANSYS: An ongoing effort designed to remove computing limitations
More informationME6130 An introduction to CFD 11
ME6130 An introduction to CFD 11 What is CFD? Computational fluid dynamics (CFD) is the science of predicting fluid flow, heat and mass transfer, chemical reactions, and related phenomena by solving numerically
More informationSound Absorption and Sound Absorbers
Sound Absorption and Sound Absorbers Slides to accompany lectures in ME 610: Engineering 00 by A. F. Seybert Department of Mechanical Engineering Lexington, KY 405060108 Tel: 859576336 x 80645 Fax:
More informationAn Introduction to Piezoelectric Transducer Crystals. Piezoelectric Materials and their Properties
An Introduction to Piezoelectric Transducer Crystals Piezoelectric Materials and their Properties Certain single crystal materials exhibit the following phenomenon: when the crystal is mechanically strained,
More informationFrequency domain application of the HotSpot method for the fatigue assessment of the weld seams
Frequency domain application of the HotSpot method for the fatigue assessment of the weld seams Dr. Ing. Sauro Vannicola 1 sauro.vannicola@ch.abb.com Dr. Ing. Luigi De Mercato 2 luigi.demercato@ch.abb.com
More informationChapter 18 4/14/11. Superposition Principle. Superposition and Interference. Superposition Example. Superposition and Standing Waves
Superposition Principle Chapter 18 Superposition and Standing Waves If two or more traveling waves are moving through a medium, the resultant value of the wave function at any point is the algebraic sum
More informationDynamic Measurement of Brake Pads Material Parameter
VDA Dynamic Measurement of Brake Pads Material Parameter 315 This nonbinding recommendation by the German Association of the Automotive Industry (VDA) has the following objectives: This standard treats
More informationSimulation im Bereich der Windenergie ein Überblick. Dipl.Ing. (FH) Nathalie Mattwich, CADFEM GmbH Dipl.Phys. oec Stephan Hecht, ANSYS Germany GmbH
Simulation im Bereich der Windenergie ein Überblick Dipl.Ing. (FH) Nathalie Mattwich, CADFEM GmbH Dipl.Phys. oec Stephan Hecht, ANSYS Germany GmbH Agenda Uhrzeit Thema Referent 16:00 16:30 Simulation
More informationUltrasonic Testing (UT) [9]
Ultrasonic Testing (UT) [9] Ultrasonic Testing (UT): A nondestructive test method that uses high frequency sound energy to conduct examinations and make measurements. Sound: The mechanical vibration of
More informationPorous Materials for Sound Absorption and Transmission Control
Purdue epubs Publications of the Ray W. School of Mechanical Engineering 812005 Porous Materials for Sound Absorption and Transmission Control J Stuart Bolton, bolton@purdue.edu Follow this and additional
More informationMULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
Exam Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) A 660Hz tone has an intensity level of 54 db. The velocity of sound in air is 345 m/s.
More informationChapter 21 Mechanical Waves. A PowerPoint Presentation by Paul E. Tippens, Professor of Physics Southern Polytechnic State University
Chapter 21 Mechanical Waves A PowerPoint Presentation by Paul E. Tippens, Professor of Physics Southern Polytechnic State University 2007 Objectives: After completion of this module, you should be able
More informationBuilding Design for Advanced Technology Instruments Sensitive to Acoustical Noise
Building Design for Advanced Technology Instruments Sensitive to Acoustic Noise Michael Gendreau Colin Gordon & Associates Presentation Outline! High technology research and manufacturing instruments respond
More information3D PIPELINE ANALYSIS SOFTWARE. Bringing added value to pipeline engineers worldwide. Editor Module
Bringing added value to pipeline engineers worldwide SAGE Profile 3D has been specifically designed to assist pipeline engineers in the design, installation and analysis of offshore pipelines. The powerful
More informationCosimulation of Microwave Networks. Sanghoon Shin, Ph.D. RS Microwave
Cosimulation of Microwave Networks Sanghoon Shin, Ph.D. RS Microwave Outline Brief review of EM solvers 2D and 3D EM simulators Technical Tips for EM solvers Cosimulated Examples of RF filters and Diplexer
More informationRay Optics Minicourse COMSOL Tokyo Conference 2014
Ray Optics Minicourse COMSOL Tokyo Conference 2014 What is the Ray Optics Module? Addon to COMSOL Multiphysics Can be combined with any other COMSOL Multiphysics Module Includes one physics interface,
More informationANSYS Tutorial. Modal Analysis
ANSYS Tutorial Slides to accompany lectures in VibroAcoustic Desin in Mechanical Systems 2012 by D. W. Herrin Department of Mechanical Enineerin Lexinton, KY 405060503 Tel: 8592180609 dherrin@enr.uky.edu
More informationDYNAMIC ANALYSIS ON STEEL FIBRE
International Journal of Civil Engineering and Technology (IJCIET) Volume 7, Issue 2, MarchApril 2016, pp. 179 184, Article ID: IJCIET_07_02_015 Available online at http://www.iaeme.com/ijciet/issues.asp?jtype=ijciet&vtype=7&itype=2
More informationRock Bolt Condition Monitoring Using Ultrasonic Guided Waves
Rock Bolt Condition Monitoring Using Ultrasonic Guided Waves Bennie Buys Department of Mechanical and Aeronautical Engineering University of Pretoria Introduction Rock Bolts and their associated problems
More informationSCATTERED SOUND POWER FROM A RIGID STRUCTURE USING NONNEGATIVE INTENSITY
SCATTERED SOUND POWER FROM A RIGID STRUCTURE USING NONNEGATIVE INTENSITY Daipei Liu, Herwig Peters, Nicole Kessissoglou School of Mechanical and Manufacturing Engineering, UNSW Australia, Sydney, NSW
More informationACCELERATING COMMERCIAL LINEAR DYNAMIC AND NONLINEAR IMPLICIT FEA SOFTWARE THROUGH HIGH PERFORMANCE COMPUTING
ACCELERATING COMMERCIAL LINEAR DYNAMIC AND Vladimir Belsky Director of Solver Development* Luis Crivelli Director of Solver Development* Matt Dunbar Chief Architect* Mikhail Belyi Development Group Manager*
More informationPiezoelectric Polymer Speakers Application Note Aug 98 Rev A
1 Aug 98 Rev A INTRODUCTION A loudspeaker is a transducer which transforms electrical signals into acoustic sound. Conventional speakers usually consist of a vibrating surface (called a diaphragm) and
More informationVibration Isolation in Data Centers
Vibration Isolation in Data Centers Vibrations in Data Centers Vibrations in Data Centers can be produced by nearby construction works, heavy traffic, railways or even the own cooling units inside or next
More informationBack to Elements  Tetrahedra vs. Hexahedra
Back to Elements  Tetrahedra vs. Hexahedra Erke Wang, Thomas Nelson, Rainer Rauch CADFEM GmbH, Munich, Germany Abstract This paper presents some analytical results and some test results for different
More informationSteve Elliott Institute of Sound and Vibration Research (ISVR) University of Southampton
Active Noise Control: Physical Principles and Practical Applications Steve Elliott Institute of Sound and Vibration Research (ISVR) University of Southampton Institute of Sound and Vibration Research University
More informationCHAPTER 3 MODAL ANALYSIS OF A PRINTED CIRCUIT BOARD
45 CHAPTER 3 MODAL ANALYSIS OF A PRINTED CIRCUIT BOARD 3.1 INTRODUCTION This chapter describes the methodology for performing the modal analysis of a printed circuit board used in a hand held electronic
More informationTWODIMENSIONAL FINITE ELEMENT ANALYSIS OF FORCED CONVECTION FLOW AND HEAT TRANSFER IN A LAMINAR CHANNEL FLOW
TWODIMENSIONAL FINITE ELEMENT ANALYSIS OF FORCED CONVECTION FLOW AND HEAT TRANSFER IN A LAMINAR CHANNEL FLOW Rajesh Khatri 1, 1 M.Tech Scholar, Department of Mechanical Engineering, S.A.T.I., vidisha
More informationDevelopment and optimization of a hybrid passive/active liner for flow duct applications
Development and optimization of a hybrid passive/active liner for flow duct applications 1 INTRODUCTION Design of an acoustic liner effective throughout the entire frequency range inherent in aeronautic
More informationIntroduction to acoustic imaging
Introduction to acoustic imaging Contents 1 Propagation of acoustic waves 3 1.1 Wave types.......................................... 3 1.2 Mathematical formulation.................................. 4 1.3
More informationSEISMIC ANALYSIS OF A VERTICAL WATER TANK
SISOM 20 and Session of the Commission of Acoustics, Bucharest 2526 May SEISMIC ANALYSIS OF A VERTICAL WATER TANK Nicolae ZEMTEV * AMEC NUCLEAR RO email: nicolae.zemtev@amecnuclear.ro The calculation
More informationOffshore Wind Turbine Support Structures
1 Wind Power R&D Seminar Deep Sea Offshore Wind Royal Garden Hotel, Trondheim, Norway January 21, 2011 Effect of Foundation Modeling Methodology on the Dynamic Response of Offshore Wind Turbine Support
More informationFLUX / GOTIt Finite Element Analysis of electromagnetic devices Maccon GmbH
FLUX / GOTIt Finite Element Analysis of electromagnetic devices Maccon GmbH Entwurfswerkzeuge für elektrische Maschinen MACCON GmbH 09/04/2013 1 Flux software Modeling electromagnetic and thermal phenomena
More informationAdvanced Loads. Patrick Cunningham. CAE Associates Inc. and ANSYS Inc. Proprietary 2013 CAE Associates Inc. and ANSYS Inc. All rights reserved.
Advanced Loads Webinar Patrick Cunningham January 2013 CAE Associates Inc. and ANSYS Inc. Proprietary 2013 CAE Associates Inc. and ANSYS Inc. All rights reserved. ELearning Webinar Series This presentation
More informationWaves and Sound Part 1
Waves and Sound Part 1 Intro Write the following questions on a blank piece of paper (don t answer yet) 1. What is the difference between a mechanical and electromagnetic wave? 2. What is the difference
More informationMAKE SURE TA & TI STAMPS EVERY PAGE BEFORE YOU START
Laboratory Section: Last Revised on September 21, 2016 Partners Names: Grade: EXPERIMENT 11 Velocity of Waves 0. PreLaboratory Work [2 pts] 1.) What is the longest wavelength at which a sound wave will
More informationKalibrierung von Materialparametern und Optimierung eines Elektromotors mit optislang
Kalibrierung von Materialparametern und Optimierung eines Elektromotors mit optislang  Calibration of material parameters and optimization
More informationSound Level Sensor DATA HARVEST. Product No Range: 40 to 110 dba Resolution: 0.1 dba Response time: 125 ms
Sound Level Sensor Product No. 3175 Range: 40 to 110 dba Resolution: 0.1 dba Response time: 125 ms Range: ±2000 mv Resolution: 1 mv Frequency response: 100 Hz  7 khz DATA HARVEST Data Harvest Group Ltd
More informationThis chapter describes how you can model solidification and melting in FLUENT. Information is organized into the following sections:
Chapter 21. Melting Modeling Solidification and This chapter describes how you can model solidification and melting in FLUENT. Information is organized into the following sections: Section 21.1: Overview
More information19 th INTERNATIONAL CONGRESS ON ACOUSTICS MADRID, 27 SEPTEMBER 2007 THE SOUND FIELD IN AN EAR CANAL OCCLUDED BY A HEARING AID
19 th INTERNATIONAL CONGRESS ON ACOUSTICS MADRID, 27 SEPTEMBER 27 THE SOUND FIELD IN AN EAR CANAL OCCLUDED BY A HEARING AID PACS: 43.66.Ts, 43.64.Ha, 43.38.Kb, 43.2.Mv Stinson, Michael R.; Daigle, Gilles
More informationWaves I: Generalities, Superposition & Standing Waves
Chapter 5 Waves I: Generalities, Superposition & Standing Waves 5.1 The Important Stuff 5.1.1 Wave Motion Wave motion occurs when the mass elements of a medium such as a taut string or the surface of a
More informationElectroSeismic Survey System
ElectroSeismic Survey System M. du Preez ABSTRACT: The electroseismic survey can be used with great success in geophysical surveys where the aim is to site groundwater. The presence of water in the porous
More informationTwinMesh Grid Generator and CFD Simulation with ANSYS CFX
TwinMesh Grid Generator and CFD Simulation with ANSYS CFX 2nd Short Course on CFD in Rotary Positive Displacement Machines London, 5th 6th September 2015 Dr. Andreas SpilleKohoff Jan Hesse Rainer Andres
More informationLab Exercise 7: Doppler Radar
Lab Exercise 7: Doppler Radar Contents 71 PRELAB ASSIGNMENT.................. 22 72 INTRODUCTION...................... 22 72.1 Speed Discrimination................ 23 72.2 Doppler Antenna..................
More informationAngle of an incident (arriving) ray or particle to a surface; measured from a line perpendicular to the surface (the normal) Angle of incidence
The maximum displacement of particles of the medium from their mean positions during the propagation of a wave Angle of an incident (arriving) ray or particle to a surface; measured from a line perpendicular
More informationCFD SIMULATION OF SDHW STORAGE TANK WITH AND WITHOUT HEATER
International Journal of Advancements in Research & Technology, Volume 1, Issue2, July2012 1 CFD SIMULATION OF SDHW STORAGE TANK WITH AND WITHOUT HEATER ABSTRACT (1) Mr. Mainak Bhaumik M.E. (Thermal Engg.)
More informationAeroacoustic simulation based on linearized Euler equations and stochastic sound source modelling
Aeroacoustic simulation based on linearized Euler equations and stochastic sound source modelling H. Dechipre a, M. Hartmann a, J. W Delfs b and R. Ewert b a Volkswagen AG, Brieffach 1777, 38436 Wolfsburg,
More informationPart IV. Conclusions
Part IV Conclusions 189 Chapter 9 Conclusions and Future Work CFD studies of premixed laminar and turbulent combustion dynamics have been conducted. These studies were aimed at explaining physical phenomena
More informationSTUDY OF DAMRESERVOIR DYNAMIC INTERACTION USING VIBRATION TESTS ON A PHYSICAL MODEL
STUDY OF DAMRESERVOIR DYNAMIC INTERACTION USING VIBRATION TESTS ON A PHYSICAL MODEL Paulo Mendes, Instituto Superior de Engenharia de Lisboa, Portugal Sérgio Oliveira, Laboratório Nacional de Engenharia
More informationStanding wave modes of a violin.
Introduction. Standing wave modes of a violin. The intent of this lab is to explore a few modes of a complicated object, and employ some of the tools used in physics labs to measure their properties and
More informationWaves Introduction A wave is a disturbance in a medium that caries energy without a net movement of particles.
Waves Introduction A wave is a disturbance in a medium that caries energy without a net movement of particles. A wave: transfers energy. usually involves a periodic, repetitive movement. does not result
More information08/19/09 PHYSICS 223 Exam2 NAME Please write down your name also on the back side of this exam
08/19/09 PHYSICS 3 Exam NAME Please write down your name also on the back side of this exam 1. A sinusoidal wave of frequency 500 Hz has a speed of 350 m/s. 1A. How far apart (in units of cm) are two
More informationRFthermalstructuralRF coupled analysis on the travelling wave diskloaded accelerating structure
RFthermalstructuralRF coupled analysis on the travelling wave diskloaded accelerating structure PEI ShiLun( 裴 士 伦 ) 1) CHI YunLong( 池 云 龙 ) ZHANG JingRu( 张 敬 如 ) HOU Mi( 侯 汨 ) LI XiaoPing( 李 小
More informationVehicle NVH Development. www.novomec.com info@novomec.com Tel: +90 216 7061324 Fax: +90 216 7061284
Vehicle NVH Development 1 Contributions on Different Product Development Phases NVH Development Phases Novomec Engineering provides consultancy and hands on project services throughout the complete vehicle
More informationSOLIDWORKS SIMULATION
SOLIDWORKS SIMULATION Drive marketwinning innovation without risk ENSURE ADEQUATE EXIT DUCT SIZING WITH FLOW SIMULATION CHECK RESONANCE BETWEEN THE FAN AND THE MOTOR Truck Mount Snowblower Wausau Everest
More information