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- W2185644893 abstract "The control of radiated sound is important for many engineering structures. This paper investigates the active control of sound radiation from flat plates through modelling. Two control systems to attenuate sound radiation from the plates are considered. Firstly, a feedforward control system is studied which can be applied for the case of tonal excitation where a reference signal is available. This control system may be realized by using a feedforward controller with appropriate transducers (actuators and sensors). The control actuators considered provide either a central point force or four corner point forces, and could be piezoelectric or inertial actuators. The error sensor is either a volume velocity sensor using PVDF film bonded on the back panel, or the total sound power sensor. Secondly, feedback control systems are investigated which can be used in the case of random excitation where a reference signal is not available. This analysis is focused on systems using simple single-channel feedback controllers, so that self-contained, compact and light sensor-controller-actuator devices can be built. Up to sixteen point force actuators with collocated point velocity sensors are controlled in a decentralized fashion by a single-channel fixed gain feedback control system for each unit. The control effectiveness, stability and robustness of each control configuration are discussed. The study has indicated that both control approaches have shown significant reductions in sound radiation. However, each feedback system is unconditionally stable, and the magnitude of the sum of the control forces required by the systems is less than the primary force. Thus, decentralized feedback control could be a feasible way for implementation in practice." @default.
- W2185644893 created "2016-06-24" @default.
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- W2185644893 date "2010-01-01" @default.
- W2185644893 modified "2023-09-27" @default.
- W2185644893 title "Active Structural Acoustic Control of Sound Radiation from Flat Plates" @default.
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