Wide frequency range sound generation system for internal noise reduction measure in motor vehicle, has vibratable diaphragm made of several passive tightened layers and active function elements

摘要

A vibratable diaphragm (1) having passive tightened single layers of isotropic or anisotropic layers with active function elements (4) formed as a multilayer bond, is held in a holder (2). The diaphragm accepts deformation energy for different stable equilibrium positions, the change in which causes sound.