Vehicle Pass-By Exterior Noise In-Cell Simulation Test Method

Paper #:
  • 951358

Published:
  • 1995-05-01
Citation:
Boland, T., Huang, J., and Flint, W., "Vehicle Pass-By Exterior Noise In-Cell Simulation Test Method," SAE Technical Paper 951358, 1995, https://doi.org/10.4271/951358.
Pages:
6
Abstract:
The vehicle pass-by exterior noise tests are generally subjected to several variables including the weather and test track surface conditions. Additionally, validity of test results depends on test driver judgment and consistency. In a time when vehicle manufacturers need to tap into all resources to control noise emissions to meet stringent limits, a more reproducible and accessible tool than the actual pass-by noise test will provide a development edge. As a major partner to vehicle manufacturers on noise control, the engine manufacturer (particularly diesel engine manufacturers) can additionally benefit from a development tool free of vehicle chassis and accessory effects. A technique developed and in use at Caterpillar simulates the pass-by noise test in-cell. This technique simulates the engine loading under vehicle acceleration with a prescribed external inertia. Corrections to measured sound pressure levels are made for vehicle speed (location versus time) and chassis effects to obtain actual pass-by noise levels.
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