CRTSⅡ型轨道砂浆脱空对车辆-轨道系统动力性能的影响

doi:10.3901/JME.2022.06.177

摘要/Abstract

摘要： 为研究CRTS Ⅱ型板式无砟轨道砂浆层与轨道板脱离对车辆和轨道结构动态响应的影响，利用有限元分析软件ANSYS结合动力学仿真软件SIMPACK建立了CRH2型车辆-弹性轨道耦合动力学模型。分析板端砂浆横向完全脱空时，不同脱空位置和脱空长度对轮轨垂向力、轮重减载率、车体垂向加速度、轨道垂向位移和轨道板拉应力的影响。结果表明：轨道板垂向位移和拉应力受砂浆脱空影响最大，可作为砂浆脱空时，轮轨系统是否满足安全要求的衡量指标。车辆和轨道位移响应受板端单侧脱空和板端对称脱空影响基本相同，但相邻板端脱空对其影响更加显著；板端单侧脱空和相邻板端脱空对轨道板拉应力影响较为一致，但其影响力度小于板端对称脱空。板端单侧脱空长度达1.95 m、板端对称脱空和相邻板端脱空长度达1.3 m时，车辆或轨道结构响应将接近或超出安全限值。通过分析砂浆不同脱空工况下轮轨系统动力学响应，可为砂浆脱空维修提供依据。从而减少轨道维修次数、节约维修成本，同时延长轨道系统寿命、保证行车安全。

关键词: 无砟轨道, 砂浆脱空, 动力响应, 联合仿真

Abstract: In order to study the effect of the mortar void of CRTS Ⅱ slab ballastless track system on the dynamic responses of the vehicle and track structures, a CRH2 vehicle-flexible track coupled dynamics model is established by the finite element software ANSYS and dynamics simulation software SIMPACK. Under the conditions of through-transverse mortar void, the influences of different positions and longitudinal lengths of mortar void on the vertical wheel-rail contact force, wheel load reduction rate, vertical acceleration of the car body, vertical displacements of track structures and tensile stress of slab are analyzed. The results show that the vertical displacement and tensile stress of the slab are most affected by the mortar void, which can be used as a measure of whether the wheel-rail system meets the safety requirements when the mortar void occurs. The vehicle responses and track displacements are basically the same as the impact of the unilateral and symmetric void of the same slab ends, but the impact of the void of the adjacent slab ends is more significant; The unilateral void of the slab end and the void of the adjacent slab ends have a relatively consistent effect on the tensile stress of the track slab, but the influence is less than the that of the symmetrical void of the same slab ends. When the length of the unilateral void of the slab end reaches 1.95 m as well as the void length of the symmetrical and adjacent slab ends reaches 1.3 m, the responses of the vehicle or track structures will approach or exceed the safety limit. By analyzing the dynamic responses of the wheel-rail system under different mortar void conditions, a reference for the maintenance of mortar void can be provided. Thereby reducing the times of track maintenance and saving maintenance costs, while prolonging the life of the track system and ensuring operation safety.

Key words: ballastless slab track, mortar void, dynamic responses, co-simulation

中图分类号:

TG156

辛欣, 任尊松, 魏雪. CRTSⅡ型轨道砂浆脱空对车辆-轨道系统动力性能的影响[J]. 机械工程学报, 2022, 58(6): 177-183,193.

XIN Xin, REN Zunsong, WEI Xue. Effects of Mortar Void of CRTS Ⅱ Slab Track on the Dynamic Performances of Vehicle-track System[J]. Journal of Mechanical Engineering, 2022, 58(6): 177-183,193.

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