基于改进天棚阻尼的半主动悬架系统动力学与电磁兼容特性分析

磁流变阻尼器(MRD)对实现智能车辆悬架系统具有重要的应用价值. 在建立整车7-DoF悬架系统模型和修正的MRD Bouc-wen滞环模型基础上,应用磁流变(MR)“四分之一”车辆悬架系统的改进型天棚阻尼控制策略,设计了一种对整车4个MR悬架子系统进行独立控制的半主动异步控制器,并考虑整车前、后轮的间距,应用带延时的谐波和平滑脉冲,及实测的随机路面信号作为路面对车轮的激励输入,对MR悬架和被动整车动力学系统的垂直、俯仰和侧倾运动性能进行了系统的比较研究,同时验证了控制器的电磁兼容特性. 结果表明:提出的基于天棚阻尼策略的半主动控制器能理想地改善MR整车悬架系统的乘坐舒适性和操纵安全性等多目标悬架性能,其控制电流的传导与辐射噪声均满足国家标准要求,为进一步开展MR智能车辆悬架系统的半主动解耦控制研究奠定了理论基础.

Analysis of Dynamics and Electromagnetic Compatibility Characteristics ofSemi-Active Suspension System Based on Improved Canopy Damping

Magnetorheological damper(MRD)has an important application value for realizing intelligent vehicle suspension system. Based on the establishment of the vehicle 7-DoF suspension system model and the modified MRD Bouc-wen hysteresis model,and the improved canopy damping of the proposed magneto-rheological(MR)“quarter”vehicle suspension system,the paper designs a semi-active asynchronous controller that independently controls the four MR suspension systems of the whole vehicle,and considers the distance between the front and rear wheels of the vehicle,and applies harmonics with delay and smoothing pulses. As well as the measured random road signal as the excitation input of the road to the wheel,the system compares the vertical,pitch and roll motion performance of the MR suspension and passive vehicle dynamics system,and verifies the electromagnetic compatibility of the controller. The results show that the proposed semi-active controller based on the canopy damping strategy can effectively improve the multi-target suspension performance of the MR vehicle suspension system,such as ride comfort and steering safety. At the same time,the control current conduction and radiation noise are satisfied. National standards require a solid theoretical foundation for further research on semi-active decoupling control of MR smart vehicle suspension systems.