动车组前端排雪动态响应及雪阻形成机理OA北大核心CSTPCD
Dynamic response of snow-removal process at the front end of EMU and resistance formation mechanism
为确定动车组前端雪体与排雪阻力间的作用关系,指导积雪加载下动车组高效排雪设计.运用耦合Drucker-Prager失效准则定义下弹塑性积雪本构和光滑粒子流体力学仿真方法,分析积雪冲击时排障面板动态响应及积雪运动状态规律,研究排雪阻力与积雪深度、雪质特性、运行边界间变化规律.基于质量守恒和达朗贝尔原理构建动车组排雪阻力映射模型,揭示动车组前端雪阻形成机理.研究结果表明:设计运行速度下承受排雪载荷的排障面板处于弹性响应阶段,不会发生塑性破坏;排雪深度为10~410 mm、积雪密度为160~480 kg/m3、行驶速度为80~160 km/h时,排雪阻力与积雪厚度、密度均呈线性正相关关系,与排雪速度呈二次正相关关系;排雪阻力理论模型能够准确预测数值计算结果;相比摩擦阻力和切削阻力,动车组冲击过程中积雪运动状态改变是排雪阻力形成的主要原因.
To analyze the relationship between the snow characteristic and snow-removal resistance and design the obstacle deflector with high-efficiency snow-removal capacity,the dynamic response of the obstacle deflector and the law of snow movement under the impact loading were analyzed by using the SPH(smooth particle hydrodynamic)simulation method and the elastoplastic constitutive defined by the Drucker-Prager failure criterion.The influence of snow depth,characteristics,and the operating boundary on snow-removal resistance was studied.A snow-removal resistance mapping model based on mass conservation and the D'Alembert principle was constructed to reveal the formation mechanism of snow-removal resistance.The results show that the obstacle deflector with the snow-removal resistance is in the elastic response and presents no plastic failure.When the snow depth is 10-410 mm,the snow density is 160-480 kg/m3 and the speed is 80-160 km/h,snow-removal resistance is linearly positively correlated with snow depth and density,and is quadratic positive correlated with snow discharge speed.The theoretical model of snow-removal resistance can accurately predict the numerical calculation results.Compared with the friction resistance and cutting resistance,the change of snow motion state after electric motor units(EMU)impact is the main reason for the formation of snow-removal resistance.
王中钢;邓迎澳;赵一鸣;袁可;申路民
中南大学交通运输工程学院,轨道交通安全教育部重点实验室,湖南长沙,410075中南大学交通运输工程学院,轨道交通安全教育部重点实验室,湖南长沙,410075||湖南工学院智能制造与机械工程学院,湖南衡阳,421002
交通运输
动车组排障面板排雪阻力动态响应
electric motor unitsobstacle deflectorsnow-removal resistancedynamic response
《中南大学学报(自然科学版)》 2024 (005)
1900-1911 / 12
国家重点研发计划项目(2022YFB4300101);湖南省自然科学基金资助项目(2023JJ10074);湖南省科技创新计划项目(2023RC1011);中国博士后科学基金资助项目(2023M743944)(Project(2022YFB4300101)supported by the National Key Research and Development Program of China;Project(2023JJ10074)supported by the Natural Science Foundation of Hunan Province;Project(2023RC1011)supported by the Science and Technology Innovation Program of Hunan Province;Project(2023M743944)supported by China Postdoctoral Science Foundation)
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