限速是抑制地铁列车运行诱发环境振动效应的有效措施之一。不同自动运行系统(ATO)控制策略下,地铁列车进站行驶速度与负加速度不同,所诱发环境振动响应也不尽相同。基于动车组快速到达、经济舒适与混合优化等3种典型ATO控制策略,提出了...限速是抑制地铁列车运行诱发环境振动效应的有效措施之一。不同自动运行系统(ATO)控制策略下,地铁列车进站行驶速度与负加速度不同,所诱发环境振动响应也不尽相同。基于动车组快速到达、经济舒适与混合优化等3种典型ATO控制策略,提出了考虑限速要求的局部敏感策略。以紧邻地铁车站大型地下空间为例,采用激振力函数模拟地铁列车荷载,建立平面应变有限元模型,分析了上述4种不同ATO控制策略下地铁列车进站运行诱发临近地下空间楼层Z振级。结果表明,地铁列车采取快速到达策略进站所诱发Z振级最大、混合优化策略次之、经济舒适策略再次、局部敏感策略最小。参数敏感性分析结果亦表明,4种ATO控制策略下,地铁车站相邻地下空间楼层Z振级均呈现随车辆荷载增加而线性增大的趋势,空载与满载工况相比较,4种策略Z振级差值均为3 d B左右;随回填土阻尼比增大,Z振级曲线整体呈指数型衰减趋势,阻尼比自0.03增至0.1时,快速到达策略Z振级降幅最小,仅为3.5 d B,而局部敏感策略Z振级降幅最大,达到6 d B;Z振级随土体动剪切模量增大呈线性衰减趋势,动剪切模量自18 MPa增至26 MPa时,4种策略下两者对应Z振级差值分别为0.3 d B、0.35 d B、0.5 d B与0.9 d B。本文研究可为地铁车站临近地下空间减振降噪提供参考。展开更多
Purpose–This study aims to explore the formation mechanism of aerodynamic noise of a high-speed maglev train and understand the characteristics of dipole and quadrupole sound sources of the maglev train at different ...Purpose–This study aims to explore the formation mechanism of aerodynamic noise of a high-speed maglev train and understand the characteristics of dipole and quadrupole sound sources of the maglev train at different speed levels.Design/methodology/approach–Based on large eddy simulation(LES)method and Kirchhoff–Ffowcs Williams and Hawkings(K-FWH)equations,the characteristics of dipole and quadrupole sound sources of maglev trains at different speed levels were simulated and analyzed by constructing reasonable penetrable integral surface.Findings–The spatial disturbance resulting from the separation of the boundary layer in the streamlined area of the tail car is the source of aerodynamic sound of the maglev train.The dipole sources of the train are mainly distributed around the radio terminals of the head and tail cars of the maglev train,the bottom of the arms of the streamlined parts of the head and tail cars and the nose tip area of the streamlined part of the tail car,and the quadrupole sources are mainly distributed in the wake area.When the train runs at three speed levels of 400,500 and 600 km$h1,respectively,the radiated energy of quadrupole source is 62.4%,63.3%and 71.7%,respectively,which exceeds that of dipole sources.Originality/value–This study can help understand the aerodynamic noise characteristics generated by the high-speed maglev train and provide a reference for the optimization design of its aerodynamic shape.展开更多
文摘限速是抑制地铁列车运行诱发环境振动效应的有效措施之一。不同自动运行系统(ATO)控制策略下,地铁列车进站行驶速度与负加速度不同,所诱发环境振动响应也不尽相同。基于动车组快速到达、经济舒适与混合优化等3种典型ATO控制策略,提出了考虑限速要求的局部敏感策略。以紧邻地铁车站大型地下空间为例,采用激振力函数模拟地铁列车荷载,建立平面应变有限元模型,分析了上述4种不同ATO控制策略下地铁列车进站运行诱发临近地下空间楼层Z振级。结果表明,地铁列车采取快速到达策略进站所诱发Z振级最大、混合优化策略次之、经济舒适策略再次、局部敏感策略最小。参数敏感性分析结果亦表明,4种ATO控制策略下,地铁车站相邻地下空间楼层Z振级均呈现随车辆荷载增加而线性增大的趋势,空载与满载工况相比较,4种策略Z振级差值均为3 d B左右;随回填土阻尼比增大,Z振级曲线整体呈指数型衰减趋势,阻尼比自0.03增至0.1时,快速到达策略Z振级降幅最小,仅为3.5 d B,而局部敏感策略Z振级降幅最大,达到6 d B;Z振级随土体动剪切模量增大呈线性衰减趋势,动剪切模量自18 MPa增至26 MPa时,4种策略下两者对应Z振级差值分别为0.3 d B、0.35 d B、0.5 d B与0.9 d B。本文研究可为地铁车站临近地下空间减振降噪提供参考。
基金The research was supported by the National Key Research and Development Program(Grant No.2020YFA0710903)the Financial Funding Project for Central Colleges and Universities(Grant No.202045014)the Science and Technology Research and Development Program of China State Railway Group Co.,Ltd.(Grant No.P2019J008).
文摘Purpose–This study aims to explore the formation mechanism of aerodynamic noise of a high-speed maglev train and understand the characteristics of dipole and quadrupole sound sources of the maglev train at different speed levels.Design/methodology/approach–Based on large eddy simulation(LES)method and Kirchhoff–Ffowcs Williams and Hawkings(K-FWH)equations,the characteristics of dipole and quadrupole sound sources of maglev trains at different speed levels were simulated and analyzed by constructing reasonable penetrable integral surface.Findings–The spatial disturbance resulting from the separation of the boundary layer in the streamlined area of the tail car is the source of aerodynamic sound of the maglev train.The dipole sources of the train are mainly distributed around the radio terminals of the head and tail cars of the maglev train,the bottom of the arms of the streamlined parts of the head and tail cars and the nose tip area of the streamlined part of the tail car,and the quadrupole sources are mainly distributed in the wake area.When the train runs at three speed levels of 400,500 and 600 km$h1,respectively,the radiated energy of quadrupole source is 62.4%,63.3%and 71.7%,respectively,which exceeds that of dipole sources.Originality/value–This study can help understand the aerodynamic noise characteristics generated by the high-speed maglev train and provide a reference for the optimization design of its aerodynamic shape.
