中文摘要：

为降低汽车磁流变悬架系统中传感器成本,提高系统可靠性,提出了一种具有非对称力学特性的汽车磁流变减振器结构设计方案及分级控制方法。根据结构设计方案,对其力学输出特性进行了理论分析,并进行了样机加工与试验测试。为分析分级控制算法在相应半主动悬架中的控制效果,建立了1/4车辆悬架动力学模型,进行了动力学仿真分析。研究结果表明,所设计的磁流变减振器具有连续输出非对称阻尼力的工作特性,验证了设计思路和方法的有效性;采用分级控制算法的半主动悬架在适应道路条件的变化方面比被动控制下的悬架具有更大的优越性;虽然分级控制的控制效果在部分路面下没有天棚控制的控制效果好,但基于分级控制的减振控制系统可以节约成本并提高可靠性,具有较好的应用前景。

英文摘要：

In order to reduce the costs of sensors and to improve the reliability of the magnetorheological（MR） semi-active suspension system,a novel structure for MR shock absorber with asymmetric damping force and the corresponding control strategy were put forward herein.On the basis of the design structures,the output damping of the MR shock absorber was analytically derived.A shock absorber was fabricated and tested under different sinusoidal excitations.A quarter car＇s model was developed to analyze the control performance of suspension which applied the novel magneto-rheological shock absorber.The results show that the MR shock absorber may continuously generate asymmetrical damping forces which verify the validity of the design method.In addition,the semi-active suspension under hierarchical control strategy has better performance than that of passive suspension.In spite of the skyhook control strategy had better performance than that of hierarchical control strategy under some road surfaces,the damping systems via the hierarchical control strategy need less number of sensors,which is beneficial to reduce costs,improve reliability,and practical applications.