动车组天线梁随机振动疲劳寿命评估

Evaluation of the Random Vibration Fatigue Life for Bullet Train Antenna Beam

为对动车组天线梁的随机振动疲劳寿命进行评估,首先,建立天线梁及构架结构有限元模型,并对其分析得到天线梁的固有频率;然后,利用软件编程得到德国低干扰轨道不平顺自功率谱,再根据自功率谱得到各轮对间互功率谱;最后,在有限元分析软件中对各轮对进行激励加载,采用模态叠加法对天线梁进行随机振动疲劳寿命分析,得到结构疲劳寿命薄弱位置。

A finite element model of antenna beam and truck frame structure is set up to evaluate the random vibration fatigue life of bullet train antenna beam, the natural frequency of the antenna beam through model analysis is obtained. Then, the auto - power spectrum of Germany low interference track spectrum is obtained by software programming, which is used to get the cross-power spectrum for each wheel. Finally, each wheel is incentive loaded in finite element analysis software, and the random vibration fatigue life of antenna beam is analyzed by using model superposition method. Thus, the weak position in antenna beam structure is detected.