摘要
针对双自由度1/4车辆模型,采用磁流变阻尼器(MRD)的滞环阻尼力-速度(F-v)模型,建立磁流变(MR)悬架系统的动力学方程。分别研究了系统在简谐路面作用下随激励频率、激励幅值的分岔特性,并利用相平面图、Poincaré截面和功率谱等详细描述了通向混沌振动的路径。同时,结合MR悬架系统半主动控制原理,进一步探讨了悬架系统在低频段和中频段内对控制电流的敏感性。研究结果表明:MR悬架系统运动状态易受到路面激励频率和幅值的影响,但对MRD控制电流的变化并不敏感,可以通过完善控制器设计来有效抑制MR悬架系统混沌振动的发生。
The dynamic equation of a 2-DOF quarter-car magneto-rheological suspension system was established based on a hysteretic force-velocity（ F-v） model of magneto-rheological damper. The bifurcation characteristics affected by the frequency and amplitude of harmonic excitation were deeply studied by using the methods of phase diagram,Poincaré map and power spectrum. According to the principle of semi-active control,the sensitivity to control current for the suspension system was further investigated in the low frequency band and middle frequency band. The results show that the dynamic behaviors of MR suspension system are easily affected by the road excitation frequency and amplitude,and less sensitive to the control current of MRD. The conclusions provide a useful theoretical guidance for consummating the synthesis of MR semi-active suspension system and effectively suppressing its chaotic vibration.
出处
《振动与冲击》
EI
CSCD
北大核心
2015年第24期128-134,共7页
Journal of Vibration and Shock
基金
国家自然科学基金(51075215
51475246)
江苏省自然科学基金(BK20131402)
关键词
磁流变阻尼器
车辆悬架
混沌振动
半主动控制
magneto-rheological damper（MRD）
vehicle suspension
chaotic vibration
semi-active control
