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An objective method and measuring equipment for noise control and acoustic diagnostics of motorcarsAn objective method and apparatus for noise control and acoustic diagnostics of motorcar engines are reported. The method and apparatus let us know whether the noisiness of the vehicle under test exceeds the admissible threshold levels given by appropriate standards and if so what is the main source of the excessive noise. The method consists in measuring both the overall noise level and the sound pressure levels in definite frequency bands while the engine speed is controlled as well and may be fixed at prescribed values. Whenever the individually adjusted threshold level has been exceeded in any frequency band, a self-sustaining control signal is sent.
Document ID
19740020282
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Kacprowski, J.
(Kanner (Leo) Associates Redwood City, CA, United States)
Motylewski, J.
(Kanner (Leo) Associates Redwood City, CA, United States)
Miazga, J.
(Kanner (Leo) Associates Redwood City, CA, United States)
Date Acquired
August 7, 2013
Publication Date
June 1, 1974
Publication Information
Publication: The 4th Natl. Conf. on Acoustics Vol. 1A (NASA-TT-F-15375)
Subject Category
Instrumentation And Photography
Accession Number
74N28395
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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