道路模拟器加速度波形畸变的压力平衡抑制方法

In the road simulation tests, the electro-hydraulic actuator is subjected to the constant gravitational eccentric load of the tested vehicle, resulting in the distortion of the acceleration waveform in the closed-loop control system of the electro-hydraulic actuator and thereby affecting the accuracy of road spectrum reproduction. In a developed road simulator, an electro-hydraulic pressure-controlled static load balancing device was employed to counteract the gravitational effect of the tested vehicle, thus resolving the issue of acceleration waveform distortion caused by the gravitational eccentric load. The composition principle of the road simulation platform was presented and the electro-hydraulic pressure-controlled static load balancing device were built. The transfer function mathematical model and block diagram of the road simulator system were established, and the stabilities of the position closed-loop and the pressure closed-loop were analyzed. The output characteristics of the hydraulic power mechanism of the road simulator and the inertial load characteristics of the tested vehicle were deduced. On this basis, the distortion mechanism of the acceleration waveform in the closed-loop control of the electro-hydraulic actuator was analyzed. Subsequently, the AMEsim simulation models of the electro-hydraulic pressure-controlled static load balancing device and the closed-loop control of the electro-hydraulic actuator were established to conduct the simulation and experimental verification on the phenomenon of acceleration waveform distortion. The results are in line with those of the theoretical analysis. The AMEsim dynamic simulation model of the road simulator, taking into account the characteristics of the body, shock absorption, and tires of the tested bus, was established. With the collected road spectrum data of the cobblestone road as the reproduction target,the simulation and experiment of road spectrum reproduction were carried out respectively. The simulation results are basically consistent with the experimental results, verifying the suppression effect of the electro-hydraulic pressure-controlled static load balancing device on the acceleration waveform distortion and also validating the effectiveness of the established AMEsim simulation model. The research findings possess significant reference value for the development of high-precision road simulators.