摘要
为研究机车处于黏着极限态时轮对的动态行为,提出平均滑动率和动态滑动率的概念并对黏滑振动稳定性及其振动特点进行分析。黏滑振动是介于黏着和滑动的动态过程,其稳定性取决于轮轨黏着,减小平均滑动率和动态滑动率有利于黏滑振动稳定。当轮对在黏着及滑动状态的往复交替时,轮对旋转与轮对纵向振动通过轮轨纵向切向力耦合,轮对的纵向振动频率为轮对旋转固有振动频率的整数倍。建立机车机电、控制一体化系统动力学模型,再现轨面黏着条件降低时轮对黏滑振动现象,对理论分析结果进行验证。研究结果表明:增大机车一系纵向刚度,电动机吊挂刚度有利于黏滑振动稳定性,提高机车黏着性能,需要合理匹配轮对纵向定位刚度和电动机吊挂刚度,避免机车黏滑振动时引起结构共振。
In order to study the dynamic behavior of locomotive under saturated adhesion,the stability and characteristics of stick-slip vibration are analyzed with concept of average and dynamic slip rates.The stick-slip vibration is a dynamic process between stick and slip state,and its stability depends on the W/R adhesive damp,the reducing of average and slip rates is conducive to the stick-slip vibration stability.The lengthwise oscillation frequency of wheel set is several times the nature frequency of rotary vibration of wheel set,and the rotary vibration of wheel set and the lengthwise vibration of wheel set are coupled through lengthwise tangential force when the wheel set repeat in the state of adhesion and sliding alternately.The train dynamic model integrated with electromechanical and control system is established to simulate the phenomenon of stick-slip vibration on low adhesion and to verify the theoretical analysis.The results show that the increase of primary lengthwise stiffness and motor suspension stiffness are beneficial for stability and locomotive adhesion,and rational match of longitudinal locating stiffness of wheel set and motor suspension stiffness can avoid structural resonance under stick-slip vibration.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2010年第24期75-82,共8页
Journal of Mechanical Engineering
基金
国家自然科学基金(51075339
50775191)
牵引动力国家重点实验室自由探索自主研究课题(2008TPL-T05)资助项目
关键词
黏滑振动
驱动动力学
机车
黏着
参数匹配
Stick-slip vibration Driving dynamics Locomotive Adhesion Parameters matching
