扣件弹条动力特性现场测试与研究  

Field Testing and Research on Dynamic Characteristics of Fastener Elastic Bar

作　　者：赵才友[1] 王平[1] 

机构地区：[1]西南交通大学高速铁路线路工程教育部重点实验室,四川成都610031

出　　处：《中国安全科学学报》2012年第5期126-132,共7页China Safety Science Journal

基　　金：国家自然科学基金资助(51008256);铁道部重要科研项目(2011G009)

摘　　要：为揭示扣件弹条在运行过程折断的原因,通过现场测试,得到弹条在客车和货车以不同速度运行下的工作模态,并进行仿真分析,以验证识别结果的正确性。结果表明:不同行车条件下,弹条振动的优势频率是固定不变的。采用省时Ibraham时域法(STD)、复指数法和自回归滑动平均模型(ARMA)分析法对弹条的加速度进行识别,均可以较为准确地得到弹条的工作模态;边界条件不一样,如道钉螺栓扭矩不同,左右侧弹条的工作模态是不一致的;弹条的前两阶固有频率是容易被激起共振的频率,在弹条设计应重点考虑避免之,在现场弹条安装和运行维护时,对道钉螺栓的扭矩要特别注意。In order to uncover the reasons for the fastener elastic bar breakage during operation, operating modals of the elastic bar were obtained by spot test, in which passenger trains and freight trains went through the site at different speeds. Finite element simulation results were used to verify them. The results show that dominant vibration frequencies of the elastic bar are independent of train operation condi- tions. The STD method , complex exponential method and the ARMA model time series analysis method all can exactly identify the operating modal of the bar by analyzing the acceleration of the bar when the train go through the site; When the boundary conditions such as spike bolt torque are different , the operation modals of the left and right bar are inconsistent; Since the first two order natural frequencies are easy, effective measures should be taken to avoid them at the design stage and full attention should be paid to the spike bolt torque when the bar is installed and rnnint^in^rl

关 键 词：弹条 工作模态 频谱分析 固有频率 扭矩 

分 类 号：X924.3[环境科学与工程—安全科学] TH212[机械工程—机械制造及自动化]