高速列车明线交会流致振动耦合响应分析
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摘要
为探究高速列车在流致振动作用下会车压力波对车内气压的影响机理,针对某线路试验高速动车组采用多重等效方法建立有限元车厢、流场以及耦合系统模型,并进行耦合系统模态分析;通过列车交会侧传感器实测会车压力波信号,对车厢耦合系统进行气压冲击加载,分析车内流致振动耦合响应情况;将线路实测车内气压数据运用经验模态分解方法自适应分解,获取各本征模态层,并与流致振动响应数据进行对比分析。结果表明,车体振动位移的频率分布与加载的会车压力波频率相吻合;车内气压级在6.1 Hz、14.67 Hz处较大,分别与耦合系统的第一阶非刚性模态频率与结构的第一阶模态频率相吻合;同时验证会车压力波在车厢流致振动耦合模型下对车内气压影响机理分析的正确性。
In order to explore the influence mechanism of the pressure wave of trains passing each other on the internal pressure of a high-speed train under the action of flow induced vibration, an online test of a high-speed train of the body structure, flow field and the coupling system is set up by the multiple equivalent method, and the modal analysis of the coupling system is carried out. The coupled system of the high-speed train body is loaded by the measured pressure signal of trains passing each other, and the coupling response of the highspeed train is analyzed. Empirical mode decomposition method is used to self-adaptively decompose the measured air pressure data. The intrinsic mode layers are obtained and compared with the simulation data. The results show that the frequency distribution of vibration displacement of body structure coincides with the frequency of the loaded pressure wave. The internal pressure level of the high-speed train is larger at 6.1 Hz and 14.67 Hz, respectively, which coincides with the first non-rigid modal frequency of the coupling system and the first modal frequency of the structure. At the same time, verifying the correctness of the mechanism analysis of the influence of the pressure wave of trains passing each other on the internal pressure of the high-speed train by the flow-induced vibration coupling model.
In order to explore the influence mechanism of the pressure wave of trains passing each other on the internal pressure of a high-speed train under the action of flow induced vibration, an online test of a high-speed train of the body structure, flow field and the coupling system is set up by the multiple equivalent method, and the modal analysis of the coupling system is carried out. The coupled system of the high-speed train body is loaded by the measured pressure signal of trains passing each other, and the coupling response of the highspeed train is analyzed. Empirical mode decomposition method is used to self-adaptively decompose the measured air pressure data. The intrinsic mode layers are obtained and compared with the simulation data. The results show that the frequency distribution of vibration displacement of body structure coincides with the frequency of the loaded pressure wave. The internal pressure level of the high-speed train is larger at 6.1 Hz and 14.67 Hz, respectively, which coincides with the first non-rigid modal frequency of the coupling system and the first modal frequency of the structure. At the same time, verifying the correctness of the mechanism analysis of the influence of the pressure wave of trains passing each other on the internal pressure of the high-speed train by the flow-induced vibration coupling model.
引文
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[2]RICCO P,BARON A,MOLTENI P.Nature of pressure waves induced by a high-speed train travelling through a tunnel[J].Journal of Wind Engineering and Industrial Aerodynamics,2007,95(8):781-808.
[3]侯献军,郭金,杜松泽,等.基于声模态和板件贡献分析的车身降噪研究[J].汽车技术,2018(5):41-45.
[4]张俊红,李忠鹏,毕凤荣,等.基于板件贡献分析的装载机驾驶室低噪声设计[J].振动.测试与诊断,2016,36(3):568-574.
[5]徐凯,李跃明.高速列车车厢结构声-振耦合响应数值分析[J].计算机辅助工程,2011(3):42-48.
[6]LIBOVE C,BATDORF S.Elastic constants for corrugated-core sandwith plates[R].NASA TN,1951.
[7]袁培佩.乘用车声固耦合有限元模态分析[D].西安:长安大学,2014.
[8]王青伟,赵才其.三角形桁架夹芯层等效弹性常数研究和夹芯板参数优化设计[J].特种结构,2010,27(5):61-66.
[9]富明慧,尹久仁.蜂窝芯层的等效弹性参数[J].力学学报,1999(1):113-118.