磁流变阻尼器半主动控制方法的实验研究

Experimental Study on the Semi-Active Control Strategies of Magnetorheological Damper

由于磁流变阻尼器是一种高度非线性的装置,因此建立与之相适应的控制系统是半主动控制问题的关键。本文采用改进的Bingham模型建立了磁流变阻尼器的动力学特性模型,根据天棚阻尼开关控制、天棚阻尼连续控制和模糊控制三种控制方法,确立了从系统速度响应到磁流变阻尼器励磁电流之间的关系,并开发了一套半主动控制系统。在一个两自由度的简化车辆试验平台上进行半主动控制试验,对比研究了三种控制方法的控制效果。实验结果表明,在1.3Hz^2.0Hz的低频段内,开关控制的最佳减振效果为15.1%,连续控制的最佳减振效果为14.9%,模糊控制的最佳减振效果为20.1%。可见,三种控制方法都能有效的减小车体的振动,模糊控制的减振效果最佳。

Because Magnetorheological damper （MR damper） is a highly nonlinear device, how to build the corresponding control system is the key to semi-active control problems. In this paper, a dynamic property model of MR damper was built by using an improved Bingham model. According to the skyhook on-off control strategy, the skyhook continuous control strategy and the fuzzy control strategy, the relationship from the velocity response to the MR damper＇s control current was determined respectively. A semi-active control system was also manufactured. Semi-active control experiments were carried out on a simplified vehicle platform with two DOF. The damping effects of the three control strategies were compared and analyzed. Experimental results show that, in the low frequency range of 1.3Hz-2.0Hz, the best damping effect of the on-off control strategy is 15.1%, the best damping effect of the continuous control strategy is 14.9%, and the best damping effect of the fuzzy control strategy is 20.1%. The results indicate that the vibration of the car body is reduced greatly under the three control strategies, among which the fuzzy control strategy has the best damping effect.