| The docking mechanism assembly of space station is the key component of the permanent service space station under construction in China,which undertakes the tasks of docking,separation,transposition and re docking between the cabins.Therefore,before its practical application,it is necessary to analyze the inherent dynamic characteristics of the docking mechanism assembly and its dynamics under the external load.The main research work of this paper is carried out from the following aspects:(1)Working principle,load analysis,dynamic modeling and matrix establishment of composite body.This paper introduces the structure and working principle of the mechanical component assembly of docking mechanism of space station in permanent service in China.On this basis,the influence of space environment is not considered,and the external alternating load borne by the combination during its service period is counted.According to the two indexes of "load freedom" and "maximum load envelope",it is summarized,analyzed and simplified.After simplification,the loading times and amplitude of the fatigue labor load of the combination can represent the dynamic load change of the combination after 15 years of service,and According to the working principle and boundary conditions of the combination,the vibration differential equation and transfer matrix are established..(2)Free mode simulation of composite body based on finite element method.he material performance test of each component of the combination is carried out,which provides the necessary performance parameters for the finite element analysis.The finite element model of the joint mechanism combination is constructed,and the free mode is simulated by ABAQUS.The first two natural frequencies and corresponding main modes are obtained,which are verified with the subsequent free mode tests.(3)Free modal test and analysis of composite body.The free modal test is carried out on the assembly in free state.The modal parameters and main modes of the modal test are obtained,and the accuracy of the modal finite element analysis is checked,which provides the reference data for the subsequent optimization design of the docking mechanism.(4)Dynamic simulation of composite body based on finite element method.The correctness of the free modal simulation analysis of the combination is verified by the free modal test of the combination.Based on the principle of mass equivalence and stiffness equivalence,the equivalent model of the combination is constructed,and the dynamic simulation of the combination is further carried out.The stress-strain and acceleration distribution of the key position of the combination under different loads are obtained.The structural strength and dynamic response are further analyzed Whether the design requirements are met or not,the analysis results have certain theoretical guidance significance for the subsequent tests.The research work of this project is expected to be of great significance for optimizing the design of high reliability docking mechanism and guiding the engineering practice of docking technology. |
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