Active control of sound transmission loss through a single panel partition using distributed actuators.

Active control of sound transmission loss through a singlepanel partition using distributed actuators. Part I : simulationsK. Henrioulle W. Dehandschutter P. SasDepartment of Mechanical Engineering, division PMA, K.U.Leuven, Belgiume mail : kris.henrioulle@mech.kuleuven.ac.beAbstractA new acoustic actuator is designed and optimised to be used for active noise control. The active element is aflat acoustic actuator, consisting of two PVDF elements bonded on a honeycomb structure, and driven inopposite phase. The actuator can be useful in many applications. One of these, as illustrated in this article, isan active control system, designed to increase the sound transmission loss through a single panel partition inthe low frequency range. Simulations make use of an analytical model for the actuator, for the fluid structurecoupled model, and for the controller. The transmission loss can be increased considerably below 250Hz, andwith a small modification to the actuator, the system can increase the transmission loss up to 500 Hz. Specialattention is paid to a configuration suitable for an industrial application of this control technique, where theactuator is shielded from the environment by the passive plate, and using accelerometers on the passive plateas error sensors.in a configuration where the sound transmission lossthrough a single panel partition will be increased by1. Introductionan active control system based on the acousticactuator.In many active ...