The Stability Study Of Detection System Of PTPL Injector Test Bench

The main purpose of this paper is to study the stability of detection system while PTPL injector test bench running. on the basis of deep analysis of current research status at home and abroad, on the one hand, we optimize the design of the injector driving cam,on the other hand, we adopt the comprehensive control way of feedforward-feedback observation to dynamiccompensate the hydraulic system of hydraulic cylinder clamping chamber. Through the experiments, it shows this method has a preferable effect.First, the paper studies the work process of PTPL injector test bench, analyzing the probable causes which could lead to the instability of detection system. Form the results of analysis, we know that the most likely cause is the unreasonable design of injector cam profile and no corresponding compensation measures for clamping cylinder, and we give the solution to optimize the cam and compensate the clamping hydraulic cylinder.Second, by analyzing the characteristics and use of the cam with different profile, and combining with the injector driving cam working conditions, we decide to adopt modified spxapezoidal acceleration motion to optimize the design of the injector driving cam and we calculate the motion equation of cam.Third, analyzing the merit and demerit of PID feedback control and feedforward control, and basing on the characteristics of external disturbances which clamping hydraulic cylinder chamber suffered. we decided to adopt the comprehensive control way of feedforward-feedback observation to compensate the hydraulic system of hydraulic cylinder. This control way have both the timeliness of feedforward control and the accuracy of feedback control.Finally, we have a comparison test and the results show that this way is appropriate and achieve the desired effect.