多物理场耦合激励下的高铁车内噪声分析

High-Speed Train Interior Noise Analysis Under Multi-Physical-Field Coupled Excitations

搭建了整备状态下的某高速列车动力车厢有限元模型,包括白车身、内饰件和牵引传动系统.提出了多物理场激励耦合作用下的高速列车车内结构辐射噪声分析方案,分别采用刚性多体动力学、边界元法和大涡模拟获取了二系悬挂力、轨道噪声和车体表面压力脉动,与车体模态耦合后得到车体结构的振动响应.完成了时速350,km/h下的列车搭载试验和车体结构响应计算,在地板上随机选取了一个振动测点,仿真与试验得到的振动速度级曲线趋势和幅值具有较高的一致性,验证了仿真模型与多物理场耦合激励的精度.最后采用耦合边界元分析了耦合激励下的车内结构辐射噪声.

A finite element model of a curb high-speed-train motored coach was constructed,including its body-in-white,interior trim parts and traction system. An analytical scheme on the interior structural radiated noise of a high-speed train under multi-physical-field coupled excitations was proposed. Rigid multi-body dynamics,boundary ele-ment method and large-eddy simulation were employed to extract secondary suspension forces,railway noise and surface pressure fluctuations,respectively. The excitations were coupled with the coach modes to obtain the structural vibration response. The on-line test and structural response simulation of the coach were conducted at 350,km/h.A measuring point of vibration was randomly selected on the floor. The tendency and amplitude of the vibration velocity level curves from the test and simulation agreed well with each other,which validated the precisions of the numerical model and the multi-physical coupled excitations. Finally,coupled boundary element method was adopted to analyze the interior structural radiated noise under the coupled excitations.