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Power flow in an aeroelastic plate backed by a reverberant cavity

 

作者: Kenneth D. Frampton,   Robert L. Clark,  

 

期刊: The Journal of the Acoustical Society of America  (AIP Available online 1997)
卷期: Volume 102, issue 3  

页码: 1620-1627

 

ISSN:0001-4966

 

年代: 1997

 

DOI:10.1121/1.420073

 

出版商: Acoustical Society of America

 

数据来源: AIP

 

摘要:

This paper investigates the modeling of an elastic plate coupled to a reverberant acoustic enclosure and subjected to convected fluid loading. The primary objective of this work is to quantify the effects of variations in external fluid convection velocity on power flow from the plate. The plate power flow constituents consist of injected power due to turbulent boundary layer (TBL) pressure disturbance, sound power radiated to the convected flow, sound power radiated to a reverberant cavity, and power dissipated through structural damping. Results indicate that variations in the convected fluid loading can significantly alter the balance in power flow. These results demonstrate the importance of including the effects of convected fluid loading in modeling the sound transmission through plates. Results also indicate that convected fluid loading serves to decrease the sound power radiated to the cavity as the external flow velocity increases. This effect, however, is overwhelmed by the increase in turbulent boundary layer pressures with the square of the flow speed. This work concludes with a discussion on the potential effectiveness of dissipative control strategies (be they active or passive) toward minimizing the sound transmitted to the cavity.

 

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