摘要
中低速磁浮交通轨道结构振动直接影响着行车安全。以中低速磁浮轨排-桥梁结构为研究对象,通过锤击模态试验、有限元理论模拟等方法分析螺栓连接性能对轨道动力响应的影响。研究表明:锚固螺栓在正常工况下,F轨的竖向自振频率集中在60~100 Hz,谐响应频率在80 Hz以上;锚固螺栓的松动导致F轨自振频率大幅降低,谐响应频率明显降低;在列车荷载作用下轨排振动大幅提高。锚固螺栓松动改变了轨排的振动传递性,直接影响悬浮控制系统的调节过程,容易引发异常共振。
The track structure vibration of medium-low-speed maglev traffic directly affects traffic safety.By a hammering mode test and finite-element theory simulation,the medium-low-speed magnetic floating track row-bridge structure was taken as the research object,and the influence of bolting performance on the track dynamic response was analyzed.The research shows that the vertical self-vibration frequency of the F-rail is concentrated between 60 and 100 Hz,and the frequency of the harmonic response is more than 80 Hz under normal working conditions.The looseness of the anchor bolt causes the natural frequency of the° F rail to decrease greatly,and the harmonic response frequency is significantly reduced.The vibration of the rail row is greatly improved under the train load.Loose anchor bolts change the vibration transmissibility of the rail,directly affect the adjustment process of the suspension control system,and easily cause abnormal resonance.
作者
张学山
ZHANG Xueshan(Beijing Maglev Transportation Development Co.,Ltd.,Beijing 100071)
出处
《都市快轨交通》
北大核心
2020年第2期115-120,共6页
Urban Rapid Rail Transit
基金
北京市自然科学基金项目(8182041)。
关键词
轨道交通
中低速磁浮
轨排
模态分析
动力响应
自振特性
rail transit
low-speed maglev levitation
rail row
modal analysis
dynamic response
self-vibration characteristics
