A frequency response function, between an external structural excitation signal and the resulting acoustical signal at a location inside the vehicle, was measured on 98 'identical' Isuzu Rodeos and 57 'identical' Isuzu pickup trucks. A similar frequency response function was measured for an external acoustical excitation signal. Significant effort was made to control measurement variability. The air temperature and humidity inside the test vehicle were measured but not controlled. A record was kept of the tests conducted on the first vehicle for each vehicle type (designated as the reference vehicle) over the natural variation of environmental factors. The frequency response functions of the reference vehicle varied by approximately 4 - 8 dB over the frequency range 40 - 500 Hz for the structural excitation functions and also by 4 - 8 dB over the 150 to 1000 Hz frequeny range for the acoustical excitation functions because of measurement and environmental variations. The frequency response functions for the entire measurement set varied by as much as 10 - 20 dB over the same frequency range.
Variation of structural-acoustic characteristics of automotive vehicles
Variation von strukturakustischen Charakteristiken von Kraftfahrzeugen
Noise Control Engineering Journal ; 44 , 2 ; 93-99
1996
7 Seiten, 10 Bilder, 4 Tabellen, 3 Quellen
Article (Journal)
English
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