Analysis And Optimization On Active And Passive Intergrated Vibration Isolation Of Sensitive Equipment Of The Air Vehicle

With the improvement of military position in the field of near space, theperformance requirement of vehicle in such region is harsher. The vibration problem ofaircraft cabin is more severe caused by external stimulus in the bad working conditions.As a major component, sensitive instrument play an important role in ensuring patrol,monitoring condition of the vehicle, improving operational basis and so on. Therefore,reducing cabin vibration effects on sensitive instrument-that is raising sensitiveinstrument isolator isolation performance became hot research topic.Here the active vibration isolation is archived by Piezoelectric Ceramics, and thepassive vibration isolator is archived by vulcanized rubber. The active and passivevibration isolation sections were designed according to piezoelectric ceramic material,vulcanized rubber characteristics and working methods. On the base of actual spacemission statement of work requirements, overall structure of the isolator design wascompleted.A single degree of freedom model with part of the passive vibration isolationwas established. The impact of changes in its parameters was analyzed, thecharacteristic parameters of vulcanized rubber and calculation pass rate were getting bythe experimental measurement, the experimental results were inline with simulationresults trend. Based on the completion analysis of passive isolator part, a single-poledouble-hybrid isolator mechanical model was established, the effect of preload onpiezoelectric ceramic performance was analyzed, and the equivalent dynamic stiffnessof single-lever mixed isolator was measured.Control mode of piezoelectric ceramic has a direct influence on its workingperformance. A control scheme is proposed based on feed forward-feedback controller.After that, a more specific control method is put forward based on the analysis oftransmissibility of different frequency band. Based on xPC Target real-time controlmethod, transfer characteristic experiments of the active-passive mixed vibrationisolator are carried out, by which can get the transmissibility curves.Based on four parameters principle, the parameters of the single-poleactive-passive mixed vibration isolator are optimized, which can also be applied to thethree parallel vibration isolation platforms. Meanwhile, a three-legged parallelmechanism to achieve multi-degree vibration isolation is also proposed. The model ofmulti-degree vibration isolation platform is established to analyze the isolation effectsof the vibration isolation platform in both axial direction and radial direction by ADAMS. The analysis demonstrates the good isolation effect of the designed vibrationisolation device.