Abstract: Aiming at the problems of insufficient stiffness and low modal frequency of the frame end beam of the new wide-track straddle type monorail bogie, a finite element model of the frame was established and the sensitivity analysis of free/constrained modes was carried out. Two optimization schemes of adding weight-reducing holes and using aluminum alloy materials in the end beams were carried out, free/constrained modal sensitivity analysis was carried out; finally, the static strength and fatigue strength analysis of the optimized frame end beams were carried out. The results show that: under the static strength condition, the maximum stress of the optimized frame end beam is located on the frame gear box, and is less than the yield strength of the material; under the fatigue strength condition, compared with the original frame end beam, the optimized dangerous node cycle times are less, but still meet the engineering requirements.

Key words: vehicle engineering; bogie frame; structural optimization; finite element; sensitivity analysis

摘要： 针对新型宽轮距跨座式单轨转向架构架端梁刚度不足﹑模态频率低的问题，建立了构架的有限元模型，进行自由/约束模态的灵敏性分析；提出在构架端梁中增加减重孔和采用铝合金材料这两种优化方案，并进行自由/约束模态灵敏性分析；最后对优化后的构架端梁进行静强度和疲劳强度分析。研究结果显示：在静强度工况下，优化后的构架端梁最大应力位于构架齿轮箱体上，且小于材料的屈服极限强度；在疲劳强度工况下，与原有的构架端梁相比，优化后的危险节点循环次数较低，但仍满足工程要求。

关键词: 车辆工程；转向架构架；结构优化；有限元；灵敏度分析