Research On The Response Of Hydraulic Locus-Tracking System To High-Frequency Signals

The security issue of vehicle collision becomes increasingly prominent with its mass manufacture and application. So a large number of vehicle crashing tests are needed to verify its safety. Hydraulic-servo Vehicle Collision Simulation Test-bed is in the favor of vehicle manufacturing industries by high simulating precision, short response time etc. The tracking accuracy of Hydraulic Locus-tracking System to high-frequency signals is the key to the simulating precision of the Test-bed, and will determine whether the design of the Test-bed is successful directly.So this paper will study the Hydraulic Locus-tracking System to make prepare for the further design of the Test-bed theoretically.Firstly this paper linear analyzed Hydraulic Locus-tracking System and set up the simplified linear model which based on the transfer functions of the system. On the basis of the analysis of the performance parameter of the system, the paper designed the hydraulic dynamic framework of the system according to the request for the maximum speed and maximum acceleration of the system. Secondly, Based on the linear model of the system, this paper designed the control system under the linear control theory. It adopted the complex control strategy composed of PID, speed feedback, the acceleration feedback and feed-forward compensation to the input to improve the tracking accuracy of Hydraulic Locus-tracking System to high-frequency signals. In the simulation model set up under MATLAB software, this paper gets some content controlling effects of the Hydraulic Locus-tracking System by the adding of the correcting part and the optimization of the control parameter. At last the simulation model with nonlinear factors is set up according to the nonlinear and time-varying parameters performance. This paper proved the feasibility of applying linear analysis in the hydraulic tracking system and the validity of the selected control strategy by comparing the dynamic response of linear system performance model and the nonlinear model by simulation.The study above made good prepare for the further design of the Hydraulic-servo Vehicle Collision Simulation Test-bed.