Research Of Vibration Damping Technology On The Airborne Photoelectric Stabilized Platform

The high precision imaging will be influenced by the disturbance of the lineal and angular vibration from drones,which can be avoid by using photoelectric stabilized platform.A major task for photoelectric stabilized platform is to isolate the attitude angle changing by motor control and the high-frequency lineal vibration by vibration isolated system.With out of the vibration isolated system,the quality of images obtained by drones will be affected,so the study of vibration isolation system design is a major task for the development of photoelectric stabilized platform.In order to improve the accuracy and stability of the photoelectric stabilized platform,a passive vibration isolated system based on the analysis of the vibration environment was designed.And a series of simulation analysis and vibration tests verified the reliability of the whole design work of the vibration isolation system.First of all,through the flight vibration experiment,the vibration environment of the photoelectric stabilized platform were obtained in a form of power spectrum curve.With vibration transmissibility as evaluation index,the vibration isolation system of the stabilized platform were designed with shock absorber in parallel.Secondly,after the finite element model of the global structure and the main frameworks were established with MSC.PATRAN/NASTRAN,modal analysis and static mechanics analysis results were obtained.The results checked the strength,stiffness characteristics of the photoelectric stabilized platform,and provided a global modal information and a precondition for the further dynamics simulation.In the next place,by means of ADAMS,the dynamic characteristics of the vibration isolation with different damping ratio were analyzed by a series of rigid body and rigid-flexible body dynamics simulations.And the rigid-flexible body dynamics simulation results which is more real than rigid ones,show that the rigid-flexible body has resonated with the vibration signal.Then this paper summarized the effect of damping ration on vibration response of resonant region and non-resonant region.And then,the vibration signal in time domain was entered in the rigid-flexible body of stabilized platform by means of ADAMS,which come out the acceleration and velocity response curves in time domain to evaluate the global vibration-isolation efficiency.The results show that when damping ration is 0.4,the global vibration-isolation efficiency of rigid-flexible modal is 90%,and the rigid one 80%.Finally,the vibration-isolation efficiency of the vibration isolated system is above 70% based on the experimental results of the swept sine and random vibration,which validated the theory of vibration isolation and the simulation results.