减振器卸荷特性对2B0动力车动力学性能的影响

为了进一步改善动力车的动力学性能，利用多刚体动力学软件SIMPACK，采用轨道随机不平顺非线性时域响应分析方法，对完整的2B0动力车动力学模型进行了计算分析。结果表明：2B0动力车二系横向减振器和一系、二系垂向减振器的最优阻尼值通常是一定的，但是通过增大卸荷速度可以降低平稳性对卸荷阻力改变的敏感程度，从而保证使用中动力车平稳性能的稳定，对于采用二系高挠螺旋弹簧的动力车，二系横向止挡间隙与二系横向减振器阻力特性的合理匹配是获得良好的动态曲线通过性能的一个重要因素。

Influence of Damping Characteristics of Dampers on Dynamic Performances of Four-Axle Power Cars

A dynamic model for a four-axle power car was established and analyzed by using software SIMPACK and the nonlinear response analysis in time domain with random track irregularity to improve its dynamic performances. The numerical results show that the optimum damping coefficients of the secondary lateral damper, the primary and secondary vertical dampers are often certain for this kind of power cars, but the effect of the change in unloading force on the riding quality can be reduced by increasing unloading velocity to ensure its riding quality. For a four-axle power car with secondary big deflection helical springs, it is important that the secondary lateral stop clearance matches well with the secondary lateral damping characteristic to obtain a good dynamic curve negotiating performance.