Study On The Design Method Of Flexure Support Structure For Board Band Inertial Reference Stabilization Platform Based On MHD

With the improvement of the detection distance of high precision spacecraft and airborne system,the requirement of the residual angle vibration suppression level of the inertial stabilizing platform in the visual stabilization technology reaches the magnitude of sub-micro radian.While the MHD angular velocity sensor can measure the wideband micro-angular vibration with high accuracy,the wideband inertial stabilization platform based on MHD has become the key of the visual stabilization technology.In the construction of the broadband inertial stable platform,the flexible support structure is the design foundation of the system,which affects the resonant distribution of the system,restricts the working bandwidth of the system,and carries the main load of the system,and determines the positioning accuracy of the system from the structure.Therefore,the flexible support structure plays an important role in improving the stability accuracy of the broadband inertial stable platform.In this paper,the design method of flexible support structure for broadband inertial stability platform is studied:Firstly,the design method of flexible support structure is researched,and is optimized on the basis of considering the actual machining shape of the flexible support structure,according to the problem of the complicated form and the calculation precision of the existing design method,and it is used for designing the key dimension parameters of the flexible support structure for the broadband inertial stable platform.Secondly,ANSYS finite element simulation analysis is carried out on the flexible support structure which has designed for the broadband inertial stable platform,and the calculation results of the optimized design method are basically in agreement with the FEM simulation results,and the coincidence is improved by an order of magnitude compared with which between original theory design method and the simulation result.Finally,the test system is set up to test the flexible support structure's rotational stiffness and the open-loop resonant frequency of the inertial stable platform with flexible support structure,the test results show that the stiffness text value is basically consistent with the calculation results of the optimization design method,and can meet the requirements of the system structural stiffness and bandwidth.