Design And Research Of Loading System For Test Stand Of Separating And Guiding Mechanism

Rocket is an important carrier of aerospace engineering.At each stage of a multistage rocket rocket separation process to avoid the impact of rockets from the rocket's upper stage.So the performance of separation mechanism directly affects result of the rocket separated.Test Stand of Separating and Guiding Mechanism is used to test the performance of the separation and guiding mechanism.In this paper,the loading system in the test bench is designed and studied.The test bench loading system can be used to simulate the load that the separation guide receives in the process of separation.First,based on the summary of the domestic and foreign status of loading systems,electric cylinders and ball screw pair,The author analyzes the working principle of the test bench loading system and combines the design indicators to determine the overall scheme of the loading system,completes the design of the electric cylinder and loading platform in the loading test bench,completes the selection of the loading console equipment and the electrical control box.Design,finally completed the software development of the loading system.Secondly,according to the stress characteristics of the rocket separation and guiding device.it is determined that the load system needs to output two types of loads of thrust and torque.Then analyzed the force situation of the ball screw pair inside the electric cylinder in detail,summed up the type of ball movement,and explored the nature of the ball slip in the ball screw pair.The article also conducted a theoretical analysis of the contact stress of the ball screw pair.It was concluded that the stress at the contact between the ball and the screw was greater than the contact between the ball and the nut.Then the finite element software was used to analyze the contact stress of the ball and it was verified that the theoretical analysis of the contact stress was correct.The modal analysis of the ball screw pair was performed.The results show that the screw of the electric cylinder does not resonate during operation.Through the analysis of the buckling of the electric cylinder at the maximum stroke,it is concluded that the electric cylinder will not be unstable under the maximum load.Subsequently,transmission characteristics,thrust characteristics,and motion simulations were performed on the electric cylinders.In the analysis of transmission characteristics of electric cylinders,through dynamic analysis,The dynamic characteristics of the electriccylinder can be improved by selecting the appropriate parameters.Analyze the influence of the impact force generated when the electric cylinder starts.The effect of thrust velocity and friction mechanism on thrust of electric cylinder is summarized.Summarizes the influence of the torque of the motor,the lead of the lead screw,and the number of turns of the nut on the thrust output of the electric cylinder.Finally,the motion parameters of the electric cylinder were analyzed through the motion simulation of the electric cylinder,and it was verified that the analysis of the motion characteristics of the electric cylinder was correct.Finally,the functional verification test of the electric cylinder on the loading system was first carried out,and the no-load test,the maximum thrust test,the repeated positioning test and the jitter test of the electric cylinder were performed.The results show that the electric cylinder designed in this paper has complete functions.A functional verification test is performed on the loading system of the test rig.The test results show that the movement between the electric cylinders of the test bench loading system is coordinated.The loading system can be tested as a whole.