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Pass-by Noise Measurements
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English
Abstract
As new regulations constantly decrease the levels for acceptable noise, it has become increasingly important to minimize the exterior noise level of cars and trucks. As the levels approach what is technologically possible with available techniques, it becomes more important to have as much information about the noise radiating mechanism and the relationship to other mechanical processes in the vehicle. A typical passby measurement will therefore not only be a simple measurement of the maximum sound pressure level, but will include a detailed frequency analysis and order analysis, both as a function of the vehicle speed and position relative to the microphone. Simultaneously the throttle position, engine rpm and vehicle speed is measured and stored with the noise data.
The result is a complete measurement record as a function of the vehicle position, with all relevant information. This can afterwards be examined in detail to identify specific noise sources or resonances to assist in the noise reduction work.
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Citation
Deel, J., "Pass-by Noise Measurements," SAE Technical Paper 941119, 1994, https://doi.org/10.4271/941119.Also In
References
- International Standards Organization Acoustics - Measurement of noise emitted by accelerating road vehicles - Engineering method
- Society of Automotive Engineers SAE J1470 Measurement of Noise Emitted by Accelerating Highway Vehicles October 1984 March 1992
- Cherne K. D. Motor Vehicle Noise Regulations Proceedings of the 1993 Noise and Vibration Conference SAE P- 264 May 1993
- European Union Council Directive Permissible sound level and the exhaust system of motor vehicles 10 November 1992