高速列车在板式轨道线路运行时,板式轨道激振所引起的特定通过频率加剧了车体垂向振动,特定条件下引起车体垂向共振,恶化高速列车垂向平稳性并造成车体结构疲劳破坏.实际运营过程中,在板式轨道线路,动力集中动车组动力机车垂向振动剧烈.针对此现象,文章利用 UM软件建立了考虑柔性车体、钢轨弹性及轨道板弹性的机车-板式轨道耦合系统动力学模型,分析了机车通过板式轨道时的垂向振动特性.研究表明:通过板式轨道时机车车体垂向振动响应大于非板式轨道线路,轨道板通过频率及其二倍频率振动响应明显,机车在 140～160 km/h 速度时车体一阶垂弯振动加剧;相对于非板式轨道线路,机车以 160 km/h速度在板式轨道线路运行时,在线路不平顺激励及车轮一阶不圆激励工况下,车体垂向振动加速度分别增加 8%和 25%.
Influence of Slab Track Line on Locomotive Vertical Vibration
When a high-speed train runs on a slab track line,the specific passing frequency caused by the excitation of the slab track will intensify the vertical vibration of carbody and will cause vertical resonance of carbody in specific conditions,deteriorating the vertical stability of the high-speed train and causing fatigue damage to the carbody structure.During the actual operation,the power locomotive of the power concentrated EMU has violent vertical vibrations on slab track lines.This article studies this phenomenon and uses the UM software to build up a dynamic model for a locomotive-slab track coupling system considering the flexible carbody,the elasticity of steel rails and the elasticity of track slabs to analyze the vertical vibration characteristics of the locomotive when passing the slab track.The study shows the following:when passing a slab track line,the vertical vibration response of the locomotive body is more intense than that on a non-slab track line,the track slab passing frequency and its double frequency vibration response are obvious,and the first order vertical bending vibration of the locomotive body is intensified at 140～160km/h;compared with the non-slab track line,when the locomotive runs at 160 km/h on a slab track line,under the conditions of uneven excitation of the line and first order out-of-round excitation of the wheels,the vertical vibration acceleration of carbody is increased by 8%and 25%respectively.
NETL
NSTL
万方数据
维普
