摘要
在恒定转速下对某航空发动机附件机匣齿轮轴施加冲击扭矩的测试中出现齿轮根部折断的现象,为了分析其原因,利用有限元隐式和显式动力学方法,对齿轮轴在冲击扭矩下考虑旋转离心应力的静、动应力响应进行了计算分析,仿真结果与测试结果一致。根据分析结果对齿轮轴失效部位参数化建模,以齿轮轴质量最小为优化目标,利用APDL进行了失效部位的结构优化。优化结果表明,改进后的设计满足齿轮轴的功能要求,冲击载荷下产生的动应力水平与静态下冲击载荷产生的静应力比较,动应力有较大幅度的增加,在设计过程中应对齿轮轴在较短时间内的冲击载荷下产生的动应力加以考虑,以保证齿轮轴的强度有足够的安全裕度。
The static stress and dynamic stress field of gear shaft considering centrifugal stress are simulated by explicit dynamic FEM and implicit static FEM for the crack problems occurred in the impact load testing for accessory gearbox of a turbojet.The simulation results show a good correspondence with the measurement results.According to the results of the analysis,the dynamical parameter model of gear shaft failure parts is built.When the weight of the gear axis is treated as optimization objective,using APDL the failure parts is optimized.The results indicate that the optimized structure is obtained,whose weight get to minimum with constrains of strength and stiffness.Under the impact load,the dynamic stress substantially increased than the static stress.In order to ensure safety margin of structural strength,the dynamic stress caused by impact load must be considered in the design of gear shaft.
出处
《振动．测试与诊断》
EI
CSCD
北大核心
2013年第2期273-276,341,共4页
Journal of Vibration,Measurement & Diagnosis
基金
国家高技术研究发展计划("八六三"计划)资助项目(2012AA040104)
关键词
齿轮轴
冲击载荷
动应力
优化设计
gear shaft,impact load,dynamic stress,optimal design
