Veröffentlichungen und Präsentationen

An "electroacoustic absorber" is a loudspeaker, used as an absorber of sound, which acoustic impedance can be varied by electrical means. This can be achieved either by plugging passive shunt electric networks at the loudspeaker terminals ("shunt loudspeakers") or by feeding back the loudspeaker with a voltage proportional to acoustic quantities, such as sound pressure and diaphragm normal velocity ("direct impedance control").

It has already been shown that COMSOL Multiphysics® could be advantageously used to simulate the acoustic performances of passive shunt loudspeakers in a recent communication. The extension to an active impedance control using a PID control law on acoustic quantities is the motivation of the paper.