论文部分内容阅读
为了降低车体的弹性振动,将车体考虑为两端自由等截面欧拉梁,建立了铁道客车刚柔耦合系统垂向动力学模型,通过幅频特性分析计算了系统各部件固有模态以及车体模态损耗因子对车体弹性振动的影响。对车体表面局部进行约束阻尼处理,通过合理假设推导了含有约束阻尼层的车体模态损耗因子的计算公式。数值分析结果表明:车体一阶弯曲自振频率接近人体振动敏感区域,为减小车体弹性振动,必须首先降低一阶弯曲振动。良好的乘坐舒适性可以通过增加车体结构的损耗因子来实现,车体局部贴附约束阻尼层可以增加车体结构阻尼。为了使车体结构获得最大的损耗因子,阻尼材料应该贴附在弯曲变形最大的位置,并且约束层和粘弹性层贴附长度和厚度有一个最佳值。只要选择合适的阻尼材料,就能获得很好的减振效果,从而达到提高高速客车乘坐舒适性的目的。
In order to reduce the elastic vibration of the vehicle body, considering the vehicle body as a free-end cross-section Euler beam, a vertical dynamic model of the rigid-flexible coupling system of the railway passenger car is established. The natural modes of the system components and Effect of Body Modal Loss Factor on Elastic Vibration of Vehicle Body. Constrained damping on the surface of the vehicle body is partially carried out, and the formula for calculating the modal dissipation factor of the car body with constrained damping layer is derived through reasonable assumptions. The results of numerical analysis show that the natural frequency of the first-order bending of the body is close to the sensitive region of human body. To reduce the elastic vibration of the body, the first-order bending vibration must be reduced first. Good ride comfort can be achieved by increasing the loss factor of the car body structure. The local damping of the car body can increase the damping of the car body structure. In order to obtain the maximum loss factor of the car body structure, the damping material should be attached to the position where the bending deformation is the maximum, and there is an optimal value for the length and thickness of the constraining layer and the viscoelastic layer. Just select the appropriate damping material, you can get a good damping effect, so as to achieve high-speed bus ride comfort purposes.