Abstract
This chapter focuses on a new approach of actively controling sound radiation, which has emerged from previous work on active noise control. The basic idea behind this new technology is to modify or reduce the vibration of a radiating structure to diminish the radiated sound. Control schemes are classified into two main families: feed-forward and feedback control architectures. Single-input single-output control systems (SISO) have been extended to more complex multi-input multi-output (MIMO) controllers, which enable the implementation of control systems that can operate on complex multi-resonant systems. The chapter discusses the main features of the most common types of structural actuators and sensors. For the purpose of active control, mechanical vibrations is both generated and detected by strainTransducers—such as piezoelectric laminae or films—or generated by electrodynamic inertial actuators and detected by inertial sensors (accelerometers).The chapter presents an extensive and detailed review of the various stages that have brought the development of active noise control (ANC) systems into active structural acoustic (ASAC) systems and AVC systems for the control of sound radiation.
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