Pressure Fluctuations in a Flow-Excited Door Gap Cavity Model

Paper #:
  • 971923

Published:
  • 1997-05-20
Citation:
Mongeau, L., Bezemek, J., and Danforth, R., "Pressure Fluctuations in a Flow-Excited Door Gap Cavity Model," SAE Technical Paper 971923, 1997, https://doi.org/10.4271/971923.
Pages:
7
Abstract:
The flow-induced pressure fluctuations in a door gap cavity model were investigated experimentally using a quiet wind tunnel facility. The cavity cross-section dimensions were typical of road vehicle door cavities, but the span was only 25 cm. One cavity wall included a primary bulb rubber seal. A microphone array was used to measure the cavity pressure field over a range of flow velocities and cavity configurations. It was found that the primary excitation mechanism was an “edge tone” phenomenon. Cavity resonance caused amplification around discrete frequencies, but did not cause the flow disturbances to lock-on. Possible fluid-elastic coupling related to the presence of a compliant wall was not significant. A linear spectral decomposition method was then used to characterize the cavity pressure in the frequency domain, as the product of a source spectral distribution function and an acoustic frequency response function. The method was used to assess the effects of modifying the cavity geometry, adding sound absorbing material, and blocking the cavity orifice.
Access
Now
SAE MOBILUS Subscriber? You may already have access.
Buy
Select
Price
List
Download
$27.00
Mail
$27.00
Members save up to 40% off list price.
Share
HTML for Linking to Page
Page URL

Related Items

Training / Education
2018-01-10
Article
2017-03-13
Training / Education
2018-07-16
Training / Education
2011-04-12