| Modularization of spacecraft is the future development direction of aerospace industry.Interface design is the core technology of modular spacecraft design.According to the requirements of spacecraft interface performance and reliability design based on coupled cylindrical cam,the design theory of coupled cylindrical cam curved slot is established.Based on this theory,different configuration schemes with different structural spatial layout are proposed,and a tolerance analysis-based method for analyzing the overall process motion accuracy of the interface is established.The motion performance of the interface in different gravity environments is analyzed through dynamic simulation.The main contents of this thesis are as follows:(1)Analyze the failure mechanism of the interface based on coupled cylindrical cam sticking during use,and determine the location where the failure occurs to be a straight moving segment.The relationship between its output performance parameters and key structural parameters is determined by mathematical analysis method,and the mathematical expressions of the follower push distance and rotation angle on the coupling cylindrical cam curve slot size parameters are obtained.According to this,the design method of coupling cylindrical cam interface curve groove based on analytical equation is proposed,and the calculation method of coupling cylindrical cam curve groove size parameter based on genetic algorithm is given.Through case analysis,the effectiveness of the design method is verified.(2)According to the design method proposed in this thesis,three different structural spatial layout configuration schemes are given,and a design method evaluation method based on spatial utilization rate and statistical process capability is proposed,and the functions and performance characteristics of different schemes are analyzed and evaluated.According to the functional and performance requirements of the mission objectives,the positive nested configuration scheme is determined as the improvement scheme in this thesis.(3)Based on RSS tolerance analysis method,the motion accuracy of the improved scheme is studied and analyzed.According to the tolerance and machining quality standard of each part of the interface device,an evaluation function for evaluating the motion precision of the driven part is constructed,and a quantitative index of the motion precision of the driven part is formed.The calculation results show that the motion precision of the improved scheme meets the design requirements.(4)Using ADAMS software to verify the performance of the improved scheme,simulation tests are carried out in three different gravity environments of ground gravity,lateral gravity and zero gravity respectively to test the performance indexes of two stages of primary locking and secondary propulsion.Analysis and test results show that the improved scheme has stable function and is suitable for use in space gravity environment.The research in this thesis can provide reference and support for optimization of structural performance and motion precision based on coupled cylindrical cam. |
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