| With the continuous development of Chinese space technology,the demand for cable drive gear system of space docking mechanism is more and more.Butt mechanism cable drive gear system is a kind of device which transmits precise motion through the front wheel driving the rear wheel by one side connection of wire rope.Among them,the steel wire rope with high strength,good flexibility,high transmission precision good mechanical properties applied in the cable drive gear train transmission.However,it is difficult to keep the synchronization of each gear train in the transmission process,which will affect the transmission precision of the whole system.Transmission synchronization of butt joint is the key parameter of butt joint,which is directly related to the normal connection and separation of butt joint.Because the research on the synchronization of cable drive gear train of butt mechanism is not very thorough,the locking device of butt mechanism still meets some technical bottlenecks.Therefore,this thesis will focus on the docking mechanism cable drive gear train,from the establishment of system transmission error mathematical model and simulation to carry out in-depth research.In the whole system,as the steel wire rope is a flexible body,the deformation generated in the movement process is one of the important factors affecting the transmission synchronization of the cable drive gear train,which can be controlled by adjusting the preload force of the steel wire rope on the gear train.In order to explore the deformation of wire rope under the action of preloading force,and based on the action mode of the preloading force of the cable drive gear train,the prediction model of the transmission error of the gear train caused by the deformation of the wire rope in the system was established,which laid a good foundation for further simulation analysis of the synchronization of the cable drive gear train.Through the reading and analysis of the relevant literature at home and abroad,this thesis expounds the related research value.Taking butt mechanism cable drive gear train as the object,the structure and working principle were studied and analyzed,and Solid Works software was used to complete the design and overall assembly of butt mechanism cable drive gear train.Then,the synchronization is described briefly,and the mathematical model established in the previous literature is analyzed.On this basis,the ADAMS multi-body motion mechanics simulation model is established to analyze the factors affecting the transmission synchronization of the system.The difficulty lies in the modeling of flexible wire rope.In this thesis,the discrete method is adopted to simulate the wire rope modeling,and the ADAMS multi-body motion mechanics mathematical model is established to analyze the motion of the butt lock system Synchronization problem.Finally,ANSYS finite element is used to discuss the change trend of structural strength,stiffness and stability of the cable drive system of the butt mechanism when working,and further verify the guarantee of the synchronization of the cable drive system.The factors that affect the synchronicity of the system are analyzed by simulation.The research of this subject provides theoretical guidance for the motion process of butt mechanism cable drive gear train and improves the transmission accuracy. |
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