"e"型扣件弹条断裂原因频谱分析

Fractures of etype Fastening Clip by Spectral Analysis Method

摘要:

基于扣件实际尺寸，建立e型扣件精细化模型，采用非线性接触和约束处理扣件各部件间的相互作用关系，并引入时频域响应关系分析方法，对弹条在自然状态和服役状态下的模态振型、谐响应特性进行分析，从时频域角度揭示弹条断裂的根本原因，并与现场测试结果进行对比.研究表明，弹条自然状态下的前两阶频率(808~812 Hz、869 Hz)和服役状态下的前两阶频率（410~420 Hz、530 Hz）与测试段波磨通过频率一致引发共振，是导致弹条折断的主要外因；为减少或避免弹条折断，可采取改变列车运营速度的方法，经计算，建议行车速度小于80 km?h-1.

Abstract:

A refined etype fastener model based on its real size was established and nonlinear contact and restraints were used to deal with the interaction between the components of the fastener. The modal shapes and harmonic response characters of the fastener, in both unrestraint and service status, were analyzed using the timefrequency responses analytical method. Besides, the main cause for fastener fracture was revealed and compared with the field test results. This research shows that the first and second resonance frequencies of fasteners in unrestraint and service status (808 Hz~812 Hz, 869 Hz and 410 Hz~420 Hz, 530 Hz) agree with the test section corrugation frequencies, which is the main cause leading to fasteners fracture. An effective way to reduce or avoid fastener fracture is to change the running speed of the train. To avoid the resonant response, it is recommended to control the traveling speed under 80 km?h-1 after calculation.