中国铁道科学Issue(1)：1-7,7.DOI:10.3969/j.issn.1001-4632.2013.01.01
移动荷载作用下周期支撑轨道结构振动研究
Study on Vibration of Periodic Supported Track Structure under Moving Loads
摘要
Abstract
The track structure is regarded as an infinite periodic structure which is periodically supported by sleepers (or fasteners). Using the characteristics of the periodic structure's dynamic response in frequency domain under a harmonic moving load with a constant velocity and the principle of superposition, the key point of solving the track vibration under moving loads is transformed to solve a system of linear e-quations with eight unknowns in frequency domain. From the researches on the track vibration under moving loads which are based on the proposed analytical method, the following conclusions are obtained: under a single harmonic moving load with middle-low velocity, the peak location of rail displacement spectrum appears near the load frequency, and with the increase of load velocity, the peak of rail displacement spectrum becomes smaller, while the peak location moves towards the natural frequency of track. Due to the superposition of series of loads, the rail displacement spectrum would have a broader distribution. With the increase of moving velocity, the rail displacement spectrum under train axle-load would move towards higher frequencies. There are several critical velocities in the track structure, and the minimum one can be increased through improving foundation stiffness. The presence of foundation damping can significantly reduce the vibration boom of track structure.关键词
轨道结构/振动响应/移动荷载/周期结构/钢轨/临界速度/强振动/频域Key words
Track structure/ Vibration response/ Moving load/ Periodic structure/ Rail/ Critical velocity/ Vibration boom/ Frequency domain分类
交通工程引用本文复制引用
马龙祥,刘维宁,刘卫丰..移动荷载作用下周期支撑轨道结构振动研究[J].中国铁道科学,2013,(1):1-7,7.基金项目
国家自然科学基金资助项目(51008017) （51008017）
北京交通大学优秀博士研究生创新研究基金项目(2011YJS253) （2011YJS253）
