Improvement of transmission loss of a double panel by using active control with a virtual modal mass

Abstract

In this article, modal feedback control is proposed to reduce the sound transmission through finite double panels using lead zirconate titanate ceramic sensors and actuators bonded to the structure. Active control allows adding virtual modal damping and mass to the structure by the use of modal velocities and accelerations. In a first step, the equations describing the structure, the actuators, the acoustic excitation, and the acoustic radiation are detailed. Next, the state space formulation of the smart structure is presented. In a second step, the implementation of active control is illustrated through the use of numerical examples. Finally, simulations are performed using two actuators, allowing five modes to be controlled. The transmission loss factors of the controlled and uncontrolled structure are shown as a function of the required command voltage. These results are also compared with those achieved using other vibroacoustic control techniques.