2016-08-242016-08-242004-03-02http://hdl.handle.net/10919/72486The active/passive absorber for extended vibration and sound radiation control includes principally two layers. The first layer has a low stiffness per unit area which allows motion in the direction perpendicular to its main plane. The second layer is principally a mass layer. These two combined layers have a frequency of resonance close to one of the main structure. The dynamic behavior of the coupled system makes the active/passive absorber a passive absorbe; however, the first layer can be electrically actuated to induce motion in the direction perpendicular to its main plane. This addition property induces and/or changes the motion of the mass layer and therefore improves the dynamic properties of the active/passive absorber system.application/pdfen-USPatenthttp://pimg-fpiw.uspto.gov/fdd/04/003/067/0.pdf9294398181/208310/321310/326310/328310/800381/71.2B32B3/28F16F15/00Y10S310/806700304