摘要
梯形轨枕轨道作为一种减振轨道,已经被广泛应用到轨道交通中。但是对160 km/h速度以上的梯形轨枕减振垫荷载范围的确定和刚度值的选取缺少深入研究,其不同刚度对减振效果的影响并不清晰。首先通过建立梯形轨枕有限元模型确定梯形轨枕减振垫荷载范围,然后建立车辆-轨道耦合动力学空间模型和轨道-隧道-土体有限元模型,探究160 km/h速度下,梯形轨枕减振垫低频割线刚度和第三预压固有频率处切线刚度对振动响应的影响。仿真结果表明:梯形轨枕减振垫割线刚度在12~22 kN/mm时,减振垫荷载取值范围为3~33 kN;在第三预压固有频率处切线刚度从22 kN/mm变到12 kN/mm时,插入损失由8.7 dB减小到6.9 dB;在荷载服役范围内,仅当低频割线刚度为22 kN/mm时,钢轨垂向位移满足2.5 mm限值要求,故梯形轨枕减振垫低频割线刚度不应小于22 kN/mm;当减振垫第三预压固有频率处切线刚度为22 kN/mm时,损耗因子阻尼的适当提高有利于提高减振降噪性能。
As a kind of vibration absorption track, ladder sleeper track has been widely used in rail transit. However, there is no in-depth study on the selection of the stiffness value of the ladder sleeper damping pad with the speed above 160 km/h, and the influence ratio of different stiffness on the damping effect is not clear. In this paper, the influence of different stiffness of ladder sleeper damping pad on vibration response at 160 km/h speed was deeply studied by establishing a vehicle-track coupling dynamic space model and a track-tunnel soil finite element model. Simulation results show that: When the secant stiffness of ladder sleeper vibration cushion is 12~22 kN/mm, the value range of vibration cushion load is 3~33 kN;When the tangent stiffness changes from 22 kN/mm to 12 kN/mm at the third preloading natural frequency, the insertion loss decreases from 8.7 dB to 6.9 dB. In the load service range, only when the low-frequency secant stiffness is 22 kN/mm, the rail vertical displacement meets the limit requirements of 2.5 mm, and the low-frequency secant stiffness of ladder sleeper vibration cushion is not less than 22 kN/mm. When the tangential stiffness at the third preloaded natural frequency of the vibration cushion is 22 kN/mm, appropriately increasing the damping of the loss factor is beneficial to the performance of vibration and noise reduction.
作者
李建森
高帆
韦凯
Li Jiansen;Gao Fan;Wei Kai(School of Civil Engineering,Shijiazhuang Tie Dao University,Shijiazhuang 050043,China;Xinyun Engineering Company of China Railway No.2 Engineering Group Co.,Ltd.,Chengdu 610031,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《铁道勘察》
2022年第2期87-93,共7页
Railway Investigation and Surveying
基金
广州地铁集团有限公司A类课题(HT2101572020-3)
中国中铁股份公司科研项目(2019-引导-124)
国家自然科学基金高铁联合基金项目(U1434201)
国家自然科学基金面上项目(51978583)。
关键词
梯形轨枕
市域铁路
安全性
减振效果
ladder sleeper
suburban railway
safety
vibration reduction effect
