Noise Diagnostics and Analysis Using Acoustic Imaging Technologies

I.D. #

C0607

Duration

2 Days

The demand for better and quieter vehicles in terms of NVH performance is increasing every year. This course covers the subject of noise diagnosis using various acoustic imaging technologies including nearfield acoustical holography (NAH) and beamforming technology. Acoustic imaging technologies and traditional noise diagnostic methodologies such as using a sound pressure level meter, scanning a sound intensity probe, performing laser vibrometer measurement, and transfer path analysis (TPA) will be covered. The diagnosis of noise sources and interrelationships between sound and vibration will be fully explored and students will have the opportunity to observe demonstrations of different acoustic imaging tools such as NAH and beamforming.

Learning Objectives

By attending this seminar, you will be able to: Describe the relationship between vibration and sound Explain the advantages and limitations of the traditional noise diagnostic methods Describe the benefits of the acoustic imaging technologies to diagnose noise sources Detect noise sources and their transmission paths using NAH

Who Should Attend

This course is designed for engineers in the road, off-road and aerospace industries who are responsible for noise mitigation. NVH engineers, as well as individuals responsible for the design of applications with associated NVH issues, are encouraged to attend.

Prerequisites

A baccalaureate degree in mechanical engineering and several years of experience in NVH are recommended.

Seminar Content

DAY ONE Basic Terminologies Acoustic pressure, particle velocity, acoustic intensity, and acoustic power Acoustic wavelength, frequency, and speed of sound Acoustic far field versus near field Structural wavelength, natural frequency, and natural modes Monopole, dipole, and quadrupole sources Airborne and structure-borne sounds Interrelationships between sound and vibrations Acoustic Imaging Technologies and Implementations Fourier transform based planar nearfield acoustical holography (PNAH) Inverse boundary element method (IBEM) Helmholtz equation least squares method (HELS) Beamforming Comparisons of Acoustic Imaging Technologies Comparisons of Acoustic Imaging Technology and Traditional Methods HELS versus Intensity Probe HELS versus Beamforming HELS versus Transfer Path Analysis (TPA) DAY TWO Applications of Acoustic Imaging Technologies to Noise Diagnosis Visualization of vehicle interior sound pressure field Visualization of vehicle interior sound intensity field Visualization of break squeals noise Visualization of vehicle tire noise Visualization of door slamming sound Diagnosis of vacuum cleaner noise Applications of Beamforming Technology Vehicle engine noise Vehicle wind tunnel test Vehicle pass-by noise Vehicle interior noise Demonstrations on Using NAH and Beamforming

Instructor(s):

Sean Wu

Dr. Wu is currently a Distinguished Professor in the Department of Mechanical Engineering at Wayne State University where his primary areas of interest are acoustics, vibration, and noise control. He is credited for developing now widely recognized HELS (Helmholtz equation least squares) method for visualizing acoustic radiation from an arbitrarily vibrating structure, and an alternate integral formulation for predicting acoustic radiation from arbitrary objects. Dr. Wu holds eleven U.S. patents and has received numerous awards. He is an Associate Editor for the Journal of the Acoustical Society of America (JASA) and Editor of the Journal of Computational Acoustics. Dr. Wu is a Fellow of the American Society of Mechanical Engineers (ASME), a Fellow of the Acoustical Society of America (ASA) and is a member of SAE International and the Institute of Noise Control Engineering (INCE). Dr. Wu received a B.S.M.E. from Zhejiang University, China, and M.S.M.E. and Ph.D. degrees from Georgia Institute of Technology.

Fees:

$1225

SAE Members*:

$980 - $1103

* The appropriate SAE Member discount will be applied through the Registration process.  Discounts vary according to level of membership: Elite Member 20%; Premium Member 15%; Classic Member 10%

CEU

1.3

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