Arrangement and method for identifying and compensating nonlinear vibration in an electro-mechanical transducer

摘要

The invention relates to an arrangement and a method for converting an input signal v into an output signal p(r_a) by using an electro-mechanical transducer and for reducing nonlinear total distortion p_d in said output signal p(r_a), whereas the nonlinear total distortion p_d contains multi-modal distortion u_d which are generated by nonlinear partial vibration of mechanical transducer components. An identification system generates distributed parameters P_d of a nonlinear wave model (N_d) and lumped parameters P_l of a network model (N_l) based on electrical, mechanical or acoustical state variables of transducer measured by a sensor. The nonlinear wave model distinguishes between activation modes and transfer modes, whereas the activation modes affect the transfer modes, which transfer the input signal u into the output signal p. A control system synthesizes based on the physical modeling and identified parameters P_d and P_l nonlinear distortion signals v_d and v_l which are supplied with the input signal v to the transducer and compensate for the distortion signals u_l and u_d generated by the transducer nonlinearities.