Multiobjective optimization solutions for noise reduction in composite sandwich panels using active control

摘要

In this paper, optimal solutions for noise reduction in laminated viscoelastic soft core sandwich plates are ob- tained, using active control with surface bonded piezoelectric sensors and actuators. An in -house finite element implementation of the active laminated sandwich plate is used to obtain the frequency response of the panels. Since the structural/acoustic problem is lightly coupled, the sound transmission characteristics of the panels are evaluated by computing their radiated sound power, using the Rayleigh integral method. A negative velocity feedback control law has been used to implement the active damping. The optimal location of the surface co - located pairs of piezoelectric patches is then obtained, using the Direct MultiSearch (DMS) optimization algo- rithm to minimize simultaneously the added weight, the number of controllers and noise radiation. The mini- mization of noise radiation is accomplished by minimizing the total length of the radiated sound power fre- quency response curve. Trade-o ff Pareto fronts and the respective optimal active patch con figurations are obtained and discussed.