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Radiation efficiency of convected fluid-loaded plate.
1Department of Mechanical Engineering, Vanderbilt University, VU Station 351592, Nashville, Tennessee 37235-1592, USA. ken.frampton@vanderbilt.edu
The Journal of the Acoustical Society of America
|May 27, 2003
Summary
This study quantifies how fluid convection affects sound radiation from vibrating plates. Results show fluid flow significantly increases radiation efficiency, particularly in the mid-wave number region.
Area of Science:
- Acoustics
- Fluid Dynamics
- Structural Mechanics
Background:
- Sound radiation from vibrating structures in stationary fluids is well-understood.
- The impact of fluid convection on structural acoustic radiation remains under-investigated.
Purpose of the Study:
- To quantify the effects of fluid convection on sound radiated from rectangular vibrating plates.
- To analyze the fundamental physics of a vibrating plate radiating into a convected fluid field.
Main Methods:
- Developed a computational approach to calculate the plate radiation efficiency.
- Investigated a simply supported, rectangular plate in an infinite baffle radiating into a semi-infinite convected fluid.
Main Results:
- Demonstrated a significant increase in radiation efficiency due to fluid convection.
- Observed this increase primarily in the mid-wave number region.
Conclusions:
- Fluid convection substantially alters structural acoustic radiation.
- The observed increase in radiation efficiency is linked to an effective decrease in the critical frequency.