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地铁受电弓等效模型的半虚拟参数识别
作者:钟源 钱清泉 吴积钦 徐可佳 
单位:西南交通大学 电气工程学院, 四川 成都610031
关键词:受电弓  质量模型  参数识别  动态性能 
分类号:
出版年·卷·期(页码):2019·41·第3期(50-57)
摘要:

为探究受电弓与刚性接触网系统磨耗过大、结构使用寿命短等可靠性问题,在半虚拟条件下建立适合地铁直流受电弓的动力学模型。在初步受电弓模态分析基础上,优化参数识别方法得到归算质量模型动态参数及其内部摩擦力,由数值计算结果获得各部分气动抬升力系数,建立较为完善的受电弓模型,并结合试验结果进行比较。结果表明,半虚拟的建模方法可以快速准确地建立具有限位、气动力等参数的受电弓模型,所得模型可反映受电弓在13 Hz以下的动态响应情况;模型具有弓头质量归算系数小于1,弓头刚度大且上框架刚度小的特点;在刚性接触网条件下,弓网系统主导频率接近受电弓1阶固有频率,可能会造成弓网刮蹭和共振,影响弓网系统的可靠性。

To study the reliability problems of pantograph-rigid overhead contact line system, such as excessive wear and short service life of structure, a discrete mass-spring-damper model of a metro pantograph was built in semi-virtual conditions. Based on preliminary pantograph modal analysis, the parameter identification method was optimized to obtain the dynamic parameters and internal friction force of the reduced mass model, while the uplift force factor of each part was calculated according to fluid calculation. A relatively perfect pantograph model was established, and the comparison was made with the experimental results. The results show that the semi-virtual modeling method can quickly and accurately establish a pantograph model with parameter identification information such as position stops and aerodynamics. The 3 Degree-of-Freedom mass-spring-damper model of test pantograph could reflect dynamic response accurately under 13Hz. In the obtained model, the head mass coefficient is less than 1 and head suspension stiffness is high while the upper frame stiffness is low. Since the dominant frequency of pantograph and rigid contact lines system is close to the first order natural frequency of the pantograph, it may cause system scratching and resonance, affecting the reliability of the system.

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