1 May 1994 Experiment in feedforward control for the reduction of sound transmission through an elastic plate backed by a rigid rectangular cavity
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Abstract
The payload compartment of space launch vehicles is an acoustically severe environment with sound pressure levels that often exceed 130 dB. Many of the design constraints for satellites are driven by the launch loads and any reduction in these loads would allow lighter spacecraft and significant cost savings because of reduced launch weight and testing requirements. In order to determine the levels of sound attenuation possible in such an application, a simple experimental apparatus consisting of a flexible plate backed by a rigid rectangular cavity has been built to mimic the behavior of a launch vehicle payload compartment. An external speaker is used to simulate the pressure loading caused by vehicle exhaust and turbulent flow around the launch vehicle. This paper provides a comparison of the harmonic disturbance attenuation capability and transient/convergence performance of a fixed analog feedforward and a filtered-x LMS adaptive feedforward controller for the cavity backed plate problem using piezoelectric ceramic actuators on the flexible plate and polyvinylidene fluoride pressure and plate vibration sensors. Controllers are developed for the first plate controlled mode and the first cavity controlled mode.
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Graham K. Ellis, Shozo Koshigoe, "Experiment in feedforward control for the reduction of sound transmission through an elastic plate backed by a rigid rectangular cavity", Proc. SPIE 2192, Smart Structures and Materials 1994: Mathematics and Control in Smart Structures, (1 May 1994); doi: 10.1117/12.174222; https://doi.org/10.1117/12.174222
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KEYWORDS
Analog electronics

Control systems

Actuators

Rockets

Acoustics

Electronic filtering

Ferroelectric materials

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