Study on Dynamic Responses of Track Structure under Different Moving Load Speeds
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摘要: 基于无限周期结构在频域内响应的性质和叠加原理，推导出移动荷载作用下轨道结构上任意点的垂向振动频率响应函数，数值分析了在单个移动荷载及6节B型鼓形车编组的系列移动荷载作用下不同移动速度对轨道结构动态响应的影响。研究结果表明：钢轨动态响应共振峰出现在荷载激励频率附近。在共振区随着移动速度的增大钢轨动态响应的频谱峰值带宽逐渐增大，但荷载激励频率附近的一个窄频段内的位移响应将减小。在非共振区随着移动速度的增大，钢轨动态响应将显著增大。相对于单个移动简谐载荷，系列移动简谐载荷使钢轨动态响应的频谱峰值及峰值带宽增大；随着移动速度的增加，钢轨动态响应的频谱峰值带宽增大。Abstract: Based on the dynamic response characteristics of the infinite periodic structure in frequency domain and the superposition principle, the frequency response function for the vertical vibration of any point on track structure under the moving harmonic load is derived consequently. Then, the influences of different moving load speeds on the vibration response are numerically analyzed under single moving load or the moving loads of 6 B drum type train groups. The research results indicate that the response peaks of the rail occur in the vicinity of the excitation frequency. The increase of moving speed will lead to the improvement of the peak bandwidth of the dynamic response in the resonance region, but the displacement response will decrease within a narrow frequency band in the vicinity of the excitation frequency. The dynamic response will significantly increase with increasing load moving speed in the non-resonance region. Comparing with the case of a single moving harmonic load, the peak bandwidth of the dynamic response is broader under a series of moving harmonic loads. With the increase of moving speed, the peak bandwidth of the dynamic response increases slightly.
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Key words:
- rail /
- periodic structure /
- vibration /
- moving loads /
- dynamic response
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