摘要
针对川藏铁路线路货运车辆下坡区段长时间制动导致的车轮热负荷大幅增加和车轮辐板疲劳问题,考虑热-机耦合效应,采用正交试验法对现有C70型敞车HESA型车轮辐板进行优化设计。试验选定轮辋与辐板过渡两侧倾角、辐板与轮毂过渡两侧倾角、辐板上部厚度、辐板下部厚度作为优化因素,依据车轮实际运维要求将辐板疲劳强度、车轮质量、辐板静强度列为优化目标。按照UIC510-5规程直线工况所确定的机械载荷工况,采用货车匀速通过超长连续大坡度区段踏面制动下车轮瞬态热载荷工况,对3种优化车轮辐板进行静强度校核与疲劳强度校核,并对比得到最优车轮辐板外形。结果表明:3种优化车轮辐板均满足静强度条件,其中辐板静强度最佳组合方案有效改善机械载荷下车轮辐板等效应力;3种优化车轮辐板均满足疲劳强度条件,其中疲劳强度最优组合方案有效改善热-机耦合载荷下车轮辐板疲劳强度。
Aimed at the problem of wheel thermal load increase and wheel spoke fatigue caused by long time braking in downhill section of freight vehicles under Sichuan-Tibet railway,considering the thermal-mechanical coupling effect,the orthogonal test method was used to optimize the spoke of HESA type wheel of the existing C70 gondola car.The inclination angles of the two sides of the transition between the rim and the spokes,the inclination angles of the transition between the spoke and the hub,the thickness of the upper part of the spoke and the thickness of the lower part of the spoke were selected as the optimization factors,and three optimization objectives were selected,such as the fatigue strength of the spoke,the wheel mass and the static strength of the spoke according to the actual operation and maintenance requirements of the wheel.Based on the mechanical load condition according to the UIC510-5 code straight track condition,and the thermal load condition by calculating the transient thermal load of the wheel when the freight car passes through a downhill section with a super long continuous large slope under the constant speed,the static strength and fatigue strength of the three optimization wheels were checked.The wheel shape with the most optimized spoke was obtained.The results show that the three optimized wheel spokes can meet the static strength conditions,and the best combination scheme of static strength can effectively improve the equivalent stress of wheel spoke under mechanical load.The three optimized wheel spokes can meet the fatigue strength conditions,and the best combination scheme of fatigue strength can effectively improve the fatigue strength of wheel spokes under thermal-mechanical coupling load.
作者
张宗威
温泽峰
李伟
郭俊
ZHANG Zongwei;WEN Zefeng;LI Wei;GUO Jun(School of Mechanical Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China;State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu Sichuan 610031,China)
出处
《润滑与密封》
CAS
CSCD
北大核心
2021年第5期86-93,共8页
Lubrication Engineering
基金
常规性科技援助项目(KY201701001)
国家自然科学基金项目(51775455)。
关键词
车轮辐板
热-机耦合效应
静强度
疲劳强度
wheel spokes
thermal-mechanical coupling effect
static strength
fatigue strength
