Advanced Noise Source Identification

You’ve measured your products’ sound level against a standard, whether it is an overall level, loudness, sound power or specialized tolerance. But measuring product noise levels is just the beginning. You really want to make your product quieter! This course describes methods of noise source identification. Frequency and spatial based noise source identification methods are identified for stationary and non-stationary signals.

Topics include:

Introduction & Overview

• A short review of NVH basics and terminology including frequency, wavelength, propagation and resonance and dampening will be discussed.
• What can be measured and how.

Stationary Signal Analysis Techniques

• Diagnostic Techniques for identifying translucent sources such as squeaks, rattles, run-ups and coast downs will be explored.

Sound Intensity Measurements

• A short review of the 2-microphone cross spectral intensity method, both scanning and compass based methods will be discussed.
• An advanced technique known as Selective Intensity will also be detailed.

Advanced Noise Source Identification Techniques

• Stationary & Non-Stationary transformation of sound fields, nearfield acoustical holography, conformal mapping, planar beamforming and spherical beamforming theory and application will be discussed. New Techniques for Array Acoustic Noise Source Identification will be discussed.