This paper presents results of an investigation on noise transmission through an aluminum panel clamped on a greenhouse vehicle model subject to random acoustics, random vibration, and turbulent boundary layer excitations. Experiments on random acoustics and random vibration excitations were carried out in a reverberation chamber, and those on turbulent boundary layer excitation were conducted in the wind tunnel at the Chrysler Technology Center. The transmitted noise spectra were also calculated using a single computer program VAPEPS based on Statistic Energy Analysis (SEA). The acoustic absorption coefficient and the damping loss factor for the vehicle were determined based on experimental data. Results showed that the largest differences between the measured and calculated sound pressure levels in any frequency band above 500 Hz were less than 2.5 dB for random acoustics excitation, 5.0 dB for random vibration excitation, and 5 dB for turbulent boundary layer excitation. In spite of the presence of differences in individual frequency bands, the calculated total sound pressure levels compared well with the measured ones. For example, the differences between the calculated and measured total sound pressure levels were only 0.7 dB for random acoustics excitations, 0.4 dB for random vibration excitations, and 1.8 dB for turbulent boundary layer excitation.
Noise transmission through a vehicle side window due to random acoustics, random vibration, and turbulent boundary layer excitations
Geräuschübertragung durch ein Fahrzeugseitenfenster infolge Anregung durch Zufallsschall, zufällige Schwingungen und turbulente Grenzschichten
1995
8 Seiten, 12 Bilder, 5 Quellen
Conference paper
English
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