Basic Theory Research On The Clearance Detection Platform Of Precision Shafting Based On Parallel Mechanism

The space bearing and the precision shafting are the basic guarantee for the normal operation of the space structure,the realization of on orbit service and the expected life.The clearance of precision shafting has a great influence on the joint dynamic performance,rotation accuracy,bearing capacity and even the reliability of the entire space structure.Parallel mechanism is widely used due to its advantages of small error,high precision,good dynamic performance and so on.It is a new direction and new idea in the field to study the precision shafting clearance detection platform based on the parallel mechanism.Taking the clearance detection of space precision shafting as the research objective,it mainly studies the application theory and design ideas on the detection platform from the influence factors of clearance.Furthermore,it carries out the research on the clearance detection platform of precision shafting based on parallel mechanism,and the main research contents are as follows:This paper investigates the basic theory on clearance of the bearing and shafting,explores the influence of the amount of interference assembly,temperature,rotation speed and pretightening force,and establishes the internal relationship between the working clearance and the original clearance?between the radial clearance and axial clearance.And then it discusses the application theory of the clearance detection platform based on the parallel mechanism.In consideration of the detection task of the detection platform lying between micrometer and millimeter,this paper carries out a detailed analysis of the design theory of flexible hinge according to its particularity,and it designs some wide range flexible P pair,R pair,U pair and S pair.From the point of different degrees of freedom,this paper carries out the configuration synthesis and model selection of the clearance detection platform based on the parallel mechanism.Based on the classic 6-SPS configuration and 6/3-3 6-PSS configuration with equal rod length,this paper analyzes the isotropy and determines the structure parameters of the detection platform.Furthermore,the kinematics and dynamics of the detection platformwith different configurations are analyzed.By using the joint simulation method of Solidwork,Adams and Ansys,it systematically builds the model of rigid-flexible coupling system of the 6/3-3 6-PSS detection platform with equal rod length.In addition,it simulated and verified the kinematics of the rigid-flexible coupling model.According to the task specificity of the detection platform,the paper studies the overall implementation scheme of clearance detection for precision shafting,develops the prototype and the experimental analysis of the 6/3-3 6-PSS detection platform with equal rod length.This paper aims to apply the parallel mechanism to the field of precision shafting clearance detection,and discusses a new ideas to design the bearing and shafting clearance detection platform as to provide a reference for the research of the parallel mechanism and the study on the clearance detection of the precision shafting.