Principle And Experiment Research Of Road Simulation Test Stand For Vehicle Parts

The original vehicle parts reliability experiments are preceded by driving the vehicle for a certain distance in the testing field. If the vehicle parts reliability experiment can be operated in the laboratory, the experiment efficiency could be enhanced for sure, as both the time and cost of the process would be decreased. Actually, the road simulation test stand technique has already been applied by vehicle manufacturing companies around the world.During the study of driving simulation test stand, the history and development status of this technique is reported by author. The key components of the driving simulation test stand are the time-domain revealing of driving load and the experimental acceleration calculation method.Aiming to get the expected respond signal and erase the effects of the non-linear characteristic of the system, time-domain iterative algorithm is imported to correct the driving signal step by step. The whole process of the time-domain iterative algorithm is provided. As the significant problem of the iterative process, the iterative convergence and connection between small signals are discussed as well.Numerical model of the acceleration experiment is proposed depending on the fatigue damage theory. After that, the principle of rain-flow counting method and step-stress method are discussed, respectively, the program of rain-flow counting method is provided by author as well.Depending on the numerical model and Finite Element Method (FEM), simulation progress of the acceleration survivability experiment on vehicle steering bar is accomplished. The vibration velocity of acceleration experiment and the amount of the circle period are controlled by the dynamic parameters and dynamic stress responds given by the FEM transient analysis, respectively. Simulation results illustrate that the acceleration experiment model could realize the acceleration process of the road simulation successfully.At last, a simulation test stand for a steering bar is made up of vibration stand, B&K data acquisition system and acceleration sensors. Test results illustrate that time-domain revealing of driving load can be reached through time-domain iterative algorithm, with approving convergence rate and simulation accuracy.Time-domain revealing and acceleration model are researched in this paper, and are respectively proved by a road simulation test and an accelerated process simulation of a steering column.