摘要
为了分析车轮速度和擦伤长度对机车构架疲劳寿命的影响,建立六轴机车的垂向动力学模型,利用分段函数详细构建擦伤时车轮质心的垂向运动,将其位移与速度作为激励,得到一系悬挂Z力与车轮速度和擦伤长度的关系。运用准静态叠加法得到构架应力循环范围与车轮速度和擦伤长度的关系。根据焊缝应力-寿命曲线的特点,得出构架疲劳寿命与车轮速度和擦伤长度的关系。结果显示,当车轮为新擦伤、车轮速度小于临界冲击速度或车轮为旧擦伤时,构架的疲劳寿命随擦伤长度的增加和车轮速度的提高而减少;当车轮为新擦伤、车轮速度大于临界冲击速度时,车轮速度对构架疲劳寿命没有影响,但随擦伤长度的增加而减少;轨道线路状况越好,擦伤长度和车轮速度对构架的疲劳寿命影响越大。
In order to analyze effect of wheel velocity and scratch length on fatigue life of locomotive flame, dynamics model of six-axle locomotive is set up, Vertical motion of wheel is simulated in detail by subsection function, and its displacement and velocity are considered as excite to obtain relation between primal suspension force and wheel velocity and scratch length. Relation between stress range of frame and wheel velocity and scratch length is gotten by using quasi-static superposition method Relation between fatigue life of frame and wheel velocity and scratch length is obtained according to characteristic of weld stress-life curve. The results show that when scratch of wheel is new and velocity of wheel is less than critical impact velocity, or scratch of wheel is old, fatigue life of frame will decrease along with increase of wheel velocity and scratch length; and when scratch of wheel is new and velocity of wheel is greater than critical impact velocity, fatigue life of frame is independent of wheel velocity and will decrease along with increase of scratch length; and more better of railway condition, more greater effect of wheel velocity and scratch length on fatigue life of frarne.
出处
《机械设计与制造》
北大核心
2013年第12期217-220,共4页
Machinery Design & Manufacture
基金
国家自然科学基金(51275432)
关键词
车轮擦伤
机车构架
动力学
疲劳寿命
Wheel Scratch
Locomotive Frame
Dynamics
Fatigue Life
作者简介
赵科,（1979-）,男,河南漯河人.硕士研究生,主要研究方向：机械及车辆设计.
阳光武,（1977-）,男,四川成都人,副教授,主要研究方向：车辆研究
