The Fourier Transform Applied to Vehicle Exterior Noise Source Identification Ford Motor Company

Format:

Conference/Event

Author/Creator:

Daniels, V. A., author.

Conference Name:

1976 Automotive Engineering Congress and Exposition (1976-02-23 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1976

Summary:

This paper discusses a motor vehicle noise source identification technique designed for use during the SAE J986a or similar drive-by test procedure. It provides, by application of the Fourier Transform, the capability to obtain a narrowband (9.8 Hz) frequency resolution over an extended frequency range (0-10,000 Hz) at the peak vehicle noise level, a particular RPM, or a particular vehicle location in the test zone. Other features include corrections for the Doppler shift, averaging of noise tests, and subtraction of spectra of two separate noise tests from a component disconnect/reconnect procedure. The above analysis, in conjunction with the noise source isolation resulting directly from the disconnect procedure, identifies the major vehicle noise contributors in terms of their respective amplitudes and frequencies. Application of this technique to several vehicles has demonstrated its ability to accurately identify the dB(A) levels and problem frequencies of the major vehicle noise contributors in the vehicle environment

Notes:

Vendor supplied data

Publisher Number:

760151

Access Restriction:

Restricted for use by site license