摘要
为了探究高速扁疤车轮冲击作用时频特性,基于机械动力学及有限元理论建立考虑双层扣件特性的车辆-轨道动力相互作用模型。重点对比了不同扁疤类型及钢轨模型下轮轨冲击振动特性,并进一步分析铁垫板质量、扁疤深度及横向位置对轮轨动力响应的影响。研究表明:车轮扁疤冲击可激发轮轨宽频振动,在0~2 500 Hz范围内存在50,380,630和1 025 Hz四个特征峰值;铁木辛柯梁模型计算的3阶、4阶共振频率分别为630和1 025 Hz,而欧拉梁模型结果要高10%~15%;铁垫板参振会导致P1,P2力减小,并对轮轨2,3阶共振频率有调节作用。扁疤横向位置越接近滚动圆处,轮轨冲击振动越激烈,当扁疤位置从-8 mm移动到0 mm时,轮轨力最大值增加约1倍。
To investigate the time-frequency characteristics of impact induced by three-dimensional wheel flats,a vehicletrack dynamic interaction model considering the characteristics of double-layer fasteners is established based on multi-body dynamics and finite element theory.The wheel-rail impact vibration characteristics under different types of wheel flat and rail models are compared,and the effects of the iron bedding plate mass,the depth and lateral position of wheel flat on the wheel-rail dynamic response are further analyzed.The research results are as follows:The impact of wheel flat can excite wide-band vibrations in the wheel-rail system,with four characteristic peaks at 50,380,630 and 1025 Hz within the range of 0 to 2500 Hz.The Timoshenko beam model calculates the 3rd and 4th resonance frequencies to be 630 Hz and 1025 Hz,respectively,while the results of Euler beam model are 10%to 15%higher.The participation of the iron bedding plate in the vibration leads to a reduction in P1 and P2 forces and has a modulating effect on the 2nd and 3rd resonance frequencies of the wheel-rail system.The closer the lateral position of the wheel flat is to position the rolling circle,the more intense the wheel-rail impact vibration becomes.When the wheel flat position moves from-8 mm to 0 mm,the maximum wheel-rail force increases by approximately one fold.
作者
孙永路
李震宇
蒋博
唐尧
陆晨旭
陈迪来
SUN Yonglu;LI Zhenyu;JIANG Bo;TANG Yao;LU Chenxu;CHEN Dilai(Hefei Rail Transit Group Co.,Ltd.,Hefei 230041;China Railway Shanghai Group Co.,Ltd.,Shanghai 200071;Chengdu Metro Operation Co.,Ltd.,Chengdu 610000;China Railway Shenyang Group Co.,Ltd.,Shenyang 110000;School of Railway Transportation,Shanghai Institute of Technology,Shanghai 201418)
出处
《机械设计》
北大核心
2025年第S2期158-163,共6页
Journal of Machine Design
基金
国家自然科学基金(52502482)
中国铁道科学研究院集团有限公司基金(2024YJ303)
上海市“一带一路”中老铁路工程国际联合实验室项目(21210750300)
上海应用技术大学协同创新项目(XTCX2024-07)
关键词
高速铁路
车轮扁疤
轮轨共振
动力特性
钢轨模型
high-speed train
wheel flat
wheel-rail resonance
dynamic response
track model
