【摘要】 建立了基于混合模式的磁流变液减振器的工作电流与阻尼力的数学模型和单自由度车辆随机振动非线性数学模型。运用随机振动理论,对磁流变液减振器非线性模型进行了线性化处理,给出了减振器等效阻尼系数、车身加速度等参量的随机统计量的计算方法。利用数值仿真分析了半主动悬架系统控制器的驱动电流对车辆减振器等效阻尼系数的影响,对车辆悬挂质量垂直振动加速度功率谱均方根值的影响。研究结论表明磁流变液减振器所产生的阻尼力具有非线性特性,通过调节减振器等效阻尼系数可以实现对车辆随机振动特性的调节,并且适当地增加磁流变液减振器的驱动电流能够降低车辆随机振动加速度功率谱均方根值,提高车辆行驶的平顺性。更多还原

【Abstract】 A mathematical model of the force-drive current and damp force based on the mix mode of flow mode,shear mode is established;and a 1DOF vehicle vibration model with semi-active suspension system is described. Based on the theory of random vibration, nonlinear behavior of MR damper model is to be linearization, the expression of equivalent linear damping coefficient is brought forward; and random statistic data of sprung mass acceleration are discussed. On the basis of MATLAB/SIMULATION, the effect of driving current on linear damping coefficient and the acceleration power spectral mean square root of the sprung mass is analyzed. The simulation result shows that the force generated by MR damper has nonlinear behavior;the vehicle vibration characteristics can be adjusted by changing the equivalent linear damping coefficient; the acceleration power spectral mean square root of sprung mass can be decreased by increasing the driving current of MR damper;and the ride of automobile has been improved.更多还原