active vibration isolation of electronic components by piezocomposite clamped–clamped beam

the sensitive electronic components used in military and aerospace applications endure some intense vibrations. these vibrations have some disturbing effects on the stability and on the service life of these devices. so, protecting these elements becomes a major economic and strategic stake. vibration isolation can be applied to different levels of the on-board systems. indeed, it is advisable to isolate electronic components either at the rack level or at the board level or at the component level. in this paper, the last solution is chosen because of low moving masses which imply low control energies. an active suspension system is located between the host board and the sensitive element to be isolated. this designed control system uses a simple integral force feedback strategy. this vibration isolation control is stable for its collocated version and does not need a numerical model of the system to be controlled. robustness of the system is asymptotically guaranteed. the proposed isolation device, made of alumina for passive structure and made of pzt and pvdf for transducing layers, is experimentally tested. experimental performances are compared with theoretical performances.