Active structural acoustic control by using structural volume velocity sensing

Abstract

This paper presents a new volume velocity sensor and its application in active structural acoustic control system. Utilizing the charge output equation of the PVDF piezoelectric film and orthogonal property of trigonometric function, a design strategy for a PVDF sensor detecting the volume velocity induced by a vibrating 2D structure is presented. The designed sensor is made of shaped strips of PVDF film. The experimental implementation of the new sensor in an active structural acoustic control system is then presented. The experimental results obtained validate this new type of volume velocity sensor, and significant attenuation of the radiated sound field is obtained.

The Application of Piezoelectric Materials in Smart Structures in China

“…While controlling the sound power of the first four radiation modes, these actuators can convert the complicated multi-input and multi-output (MIMO) control system into several simple and independent single input and single output (SISO) systems. Jin et al (2009) carried out an experimental study on ASAC based on distributed structural volume velocity sensors. They used a simply supported rectangular plate and analyzed the relationship between structural surface velocity and sound power radiated by the plate in the wave-number domain.…”