最新单轴柔性体的气动主动隔振控制策略研究.pdf

Abstract Abstract Flexiblebodieswidelyexistsinspacecraft,comparingtorigidbody,thiskind structurecanprolongspacecrafts’lifespan andachievesophisticatedfunction,such as data acquiring device, camera and solar panel on the satellite platform. Pneumatic vibration isolation system has an outstanding performance referring to vibrationisolation;itcanguaranteetheprecisionofdevices,safetyandenhancethe comfort of riding. In practical application, pneumatic vibration isolation system often shows nonlinearity, this would affect the performance of device, could even damagethedevice.Thispaperstudiedthepneumaticvibrationisolationsystemwith flexible payload, considered the nonlinearity brought in by the charging/releasing processoftheairchamber. Thispaperestablishedthedynamicmodelofthepneumaticvibrationisolation system with flexible payload, analyzed system’s passive transmissibility, using payload acceleration feedback, base acceleration feed-forward and the combined way to active control the vibration isolation system. Through comparing system’s controlled transmissibility with passive transmissibility, finding that the active control could attenuate the resonant peak significantly and lower the transmissibility. Then, this paper used the adaptive filter algorithm to study the vibration isolationofthesystem.Throughthesimulationofthesingleanddoublefrequency excitation,Ifindthatafterthesinglepoint recognition,theadaptivealgorithmcould suppressthepoint’svibrationverywell;aimingatthevibrationisolationofrandom excitation, this paper put forward a new recognition approach, using this method could achieve good vibration isolation performances while only using a single off-linerecognition,thisachievedthevibrationisolationofallfrequencyrange;in addition, this paper discussed the different vibration isolation performances regardingtwocasesofwhenusingtheinterfaceunit