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- W2004757764 abstract "The objective is to control the sound fields induced by vibrating structures in flow by piezoelectric sensors and actuators. When thin structures such as plates are vibrating in a flow, the fluid loading effects lead to some important changes in the acoustic field and the structural vibration and cannot be neglected. The vibration of plate structures and the sound fields are analyzed using the finite element and the boundary element methods. It is found that some specific modes radiate sound very well compared with the other modes. Because the number of modes that can be controlled simultaneously is limited, the selection of controlled modes is prerequisite. For structural acoustic control, the well-radiating modes, namely, the modes contributing most to far-field sound radiation, should be selected as the controlled modes. Radiation efficiency is used as a reference for the selection of controlled modes. The optimal placement of the piezoceramic material (lead zirconate titanate; PZT) actuators and the optimal electrode shape of polyvinylidene fluoride sensors are determined by a genetic algorithm to minimize the well-radiating modes and to avoid the observation and control spillover. A linear quadratic Gaussian controller is designed to estimate the controlled modes from sensor output and to minimize the performance index. The result shows that global noise reduction can be realized by using the method." @default.
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- W2004757764 date "1999-10-01" @default.
- W2004757764 modified "2023-09-23" @default.
- W2004757764 title "Active Control of Sound Fields from Plates in Flow by Piezoelectric Sensor/Actuator" @default.
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- W2004757764 doi "https://doi.org/10.2514/2.611" @default.
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