高速磁悬浮列车悬浮架结构可靠性研究

Structural reliability analysis of levitation chassis of high-speed maglev

针对高速磁悬浮列车悬浮架结构可靠性评估问题,利用Hypermesh软件建立悬浮架的有限元模型,根据悬浮架实际运行情况,提出一套约束方案,并利用Ansys软件对高速磁浮列车进行静强度、疲劳强度以及模态分析,分别基于von Mises应力、Goodman疲劳极限图评估悬浮架结构的静强度和疲劳强度,基于Block Lanczos法计算悬浮架模态.结果表明:悬浮架的静强度分析结果显示4种超常载荷下最大受力位置均出现在摆杆处,总体均满足静强度要求;疲劳强度分析结果显示悬浮架上关键点应力和应力幅均在材料修正的Goodman疲劳极限内,满足疲劳强度要求;模态分析结果显示悬浮架的自振频率明显高于激振频率,不会产生共振现象,满足车辆运行要求.

Aiming at the structural reliability assessment of levitation chassis of high-speed maglev,the finite element model is established by using the software Hypermesh.According to the actual operating conditions of the levitation chassis,a method with the boundary constraint is proposed.The analysis of static strength,fatigue strength and modal of the high-speed maglev are carried out by using the software Ansys.The static strength and fatigue strength of the levitation chassis structure are evaluated based on the von Mises stress and the Goodman diagram respectively.Modal calculation of levitation chassis is based on Block Lanczos algorithm.The results show that after the static strength analysis of levitation chassis,the maximum stress positions of bogie under 4 kinds of supernormal loads occur at the pendulum bar,and they basically meet the static strength requirements.The fatigue strength analysis results show that the stress and stress amplitude of the critical points on the bogie stay within the Goodman fatigue limit about modified material,and they meet the fatigue strength requirements.Furthermore,the modal analysis results show that the natural frequency of the levitation chassis is obviously higher than its excitation frequency.Therefore,there is no resonance,and this conforms to the requirements of vehicle operation.