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Abstract
This paper describes an analytical and experimental investigation which compares the feedforward control of harmonic and random sound transmission into an acoustic cavity. A rectangular enclosure is considered that has five acoustically rigid walls and a flexible plate on the remaining side through which a plane acoustic wave is transmitted into the enclosure. The control systems are designed to reduce the acoustic potential energy inside the enclosure when the incident sound is either harmonic or random. Three control configurations classified by the type of actuators are investigated both theoretically and experimentally. They are (i) use of a single point-force actuator, (ii) use of a single acoustic piston source and (iii) simultaneous use of both a point-force actuator and an acoustic piston source. It is shown that the configuration of both acoustic and structural actuators is desirable for the active control of both harmonic and random sound transmission into a coupled structural–acoustic system whose response is governed by plate and cavity-controlled modes.
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