Active control of radiated sound from stiffened plates using IDE-PFC actuators

Abstract

It has been a practice in modern day aircraft and automobile industries to manufacture a stiffened structure for significantly enhancing efficiency and strength without incurring a considerable weight increase. In the present study, an attempt is made to understand the effect of stiffeners on the sound radiation pattern of a vibrating plate. Subsequently, a velocity feedback control algorithm based on Linear Quadratic Regulator (LQR) methodology is developed to attenuate the radiated sound power from the vibrating structures with surface bonded piezo fibre composite (PFC) patches with interdigitated electrodes (IDE) as actuators and polyvinylidene fluoride (PVDF) films as sensors. Results are obtained for different orientations of stiffeners and various locations of PFC patches and are discussed. © 2013 International Journal of Acoustics and Vibration.