Structural Design And Stability Analysis Of Large Diameter Mirror Assembly

Large diameter mirror is the key component to achieve the target function of ICF solid-state laser.It mainly completes the guidance and transmission of laser beam.Precision adjustment and structural stability control are two key technical problems that need to be solved in the design of large-caliber reflector.Therefore,it is of great significance to study the precision adjustment and structural stability control of large-caliber mirror components for improving the target shooting quality and efficiency of the device.In this paper,the whole structure design,flexure hinge flexibility and error analysis and the structural stability of the large diameter mirror are studied.The PV value and RMS value of the reflector are evaluated by finite element method and least square method.The analysis shows that the change of lens Angle has a great influence on the final shooting accuracy.The method of calculating the change of the Angle of the mirror by the normal displacement of the four corners of the mirror is presented,which provides the theoretical basis for the analysis and calculation in this paper.Three fixation methods of axial fixation,radial fixation and back fixation of the lens were respectively used to calculate PV value and RMS value by Ansys and Matlab simulation,and the radial fixation method was finally adopted through comprehensive analysis.The micro-displacement drive device driven by servo motor is designed to realize the precise adjustment of the mirror lens,the resolution of pitch and yaw Angle is calculated and the indexes required by the design are achieved,and the feasibility is verified by experiments,and the adjustment principle of the mirror is analyzed.The support mode of two axis flexure hinge in series based on the structure of flanged triangle flexure hinge is put forward,and the relationship between radius,depth and minimum thickness and their rotational flexibility and rotary precision is obtained by Matlab analysis,which provides the design basis for the hinge design.Based on the method of pseudo rigid body model,the relationship between the rotational flexibility of the hinge with two axes in series and that of the flexure hinge with two axes in series is obtained.The Ansys Workbench finite element analysis software was used to conduct static analysis,modal analysis,random vibration analysis and thermal load analysis on the large-diameter mirror component.The analysis results showed that all indexes of the mirror met the requirements,and verified the structural stability of the designed large-diameter mirror component.