| The objective of this paper is to develop a feasible indoor bench test method and carry out simulation test by analyzing the impact load of Road on the automotive transmission system.Through the ADAMS / car simulation test,the results of the impact are analyzed,which leads to the feasibility and necessity of reproducing the road impact load in the bench dynamic test to simulate the impact load caused by the road excitation when the vehicle passes through the uneven road during the driving process.Firstly,the target vehicle is modeled and simulated in ADAMS / car environment,and the simulation results are analyzed.Then,the key components of the tested vehicle are decomposed and modeled in the Simulink environment,and the simulation model of the bench is built.In order to reproduce the road impact load on the bench model,the physical model of the vertical servo hydraulic loading system is built through simscape,and the loading method and control method are analyzed.The PID controller model is established to control the loading force output by the vertical servo hydraulic loading system and complete the simulation test.Finally,a test-bed of transmission matching drum is built,which is used to reproduce the road impact load in the dynamic test of transmission system,and the test results are analyzed.The research work of this paper is the road impact load simulation test part of the joint research and development project "power transmission system matching performance test-bed" by the research group of the author and an automobile enterprise.The main work is as follows:(1)This paper analyzes the influence of the road impact load on the fatigue life of the rotating parts of the transmission system,and then models the vehicle road model according to the vehicle type studied by the project team,and completes the road simulation test of the whole vehicle,obtains the simulation test data and analyzes the influence of the two road impact loads on the torque fluctuation of the transmission system and the relationship with the vertical force of the wheel.(2)In the Simulink environment,the engine model,transmission system model,tire model,vehicle driving dynamics model and hydraulic loading system model are analyzed.The magic formula tire model,driving power transfer diagram and the working principle of hydraulic system model are mainly analyzed.In the established model,the relationshipbetween the established hydraulic system model and the vehicle model based on the bench is explained.The tire model and hydraulic system model should be modeled in detail,which aims to make the bench model match the actual bench model better.(3)The loading method of the hydraulic system based on the theory of PID control method is designed.The PID controller is designed to control the output loading force of the vertical servo hydraulic loading system,and the simulation tests of two kinds of road impact loads are completed respectively.The control effect diagrams of two kinds of road impact load simulation are analyzed.The control error of rolling road simulation is about5.8%;the control error of deceleration belt road simulation is about 10.3%.Finally,it is concluded that the hydraulic system under PID control can simulate the impact load of the road with high precision,which can reflect the characteristics of the impact load caused by different roads,and realize the recurrence of the impact load of the road in the computer simulation bench model.(4)The drum test-bed of transmission system with vertical servo hydraulic loading system is built.The mechanical structure,measurement and control system and the real-time control model of the platform are designed.The working principle of vertical servo hydraulic loading system is emphatically analyzed.The simulation of road impact load is completed on the bench,and the test results are analyzed.The simulation error of impact load caused by rolling road is within 8.5%;the simulation error of impact load caused by deceleration belt road is within 12.1%. |
PDF Full Text Request