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不同车辆-轨道垂向动力学模型功率流传递特性研究
作者:   任尊松       
单位:北京交通大学 机械与电子控制工程学院, 北京 100044
关键词: 车辆-轨道系统垂向动力学模型  功率流传递函数  悬挂参数  惯性参数 
分类号:
出版年·卷·期(页码):2019·41·第5期(35-45)
摘要:

基于4种不同精细化程度的车辆-轨道垂向动力学模型,利用解析方法建立了形式统一的系统相邻部件间功率流传递函数,给出了车辆一系悬挂、二系悬挂、轮轨间以及钢轨和轨枕间的振动功率流传递特性,分析模型的精细化和弹性化对于各部件间功率流传递特征的影响。以精细化程度最高的模型为研究对象,讨论车辆悬挂参数和部件惯性参数的改变对部件间功率流传递特征的影响。结果表明,简单模型能够较为真实地模拟车辆低频传递特性,但对中、高频传递特性的表达与复杂精细模型相差较大;位于激励源附近位置的轮对和钢轨,在其固有频率附近的振动能量往往具有较强的传播性;簧下质量的变化对轨枕至道砟的传递特性的影响最为明显。

Based on four vehicle-track vertical system dynamic models with different degree of refinement, through analytical method, a unified power flow transfer function between adjacent components of the system was established, whereby the power flow transmission characteristics of the primary and secondary suspension, wheel to rail, and also rail to sleeper were presented. The influence of refinement and elasticity of the models on power flow transmission characteristics between the components was analyzed. Based on the study of the model with the highest degree of refinement, the influence of the change of vehicle suspension parameters and component inertia parameters on the power flow transmission characteristics between components was discussed. The results show that simple model can be used to simulate the low frequency transmission characteristics of the vehicle accurately, however, the expression of the model varies widely from that of the refined model in terms of the middle and high frequency transfer characteristics. The vibration energy of the wheelsets and the rails located near the excitation source often shows strong propagability near the natural frequencies of the wheelsets and rails. The change of unsprung mass influences the transfer characteristics between the sleeper and the ballast most obviously.

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