摘要
为了解决旋耕刀轴因承受土壤反作用力及振动冲击而造成的疲劳失效问题,本文利用UG自有的有限元软件NX NASTRAN对刀轴进行模态及疲劳分析,得到刀轴的前10阶的固有频率与振型,获得了最先失效部位及疲劳寿命。疲劳仿真结果表明,刀轴的寿命为2.49E5h,最先发生疲劳的部位在刀轴两端,即刀轴的装配焊接处。计算结果与定性分析的结果一致,可为刀轴的可靠性优化及疲劳设计提供重要参考。
In order to solve the problem of rotary cutter shaft to withstand the soil reaction forces and vibration impact caused by fatigue failure.This article uses NX NASTRAN of UG own finite element software to carry on modal and fatigue analysis,obtains the natural frequency of the first ten steps and vibration mode,predicted the first failure and the fatigue life.Combined with fatigue simulation,the result showed that the life of knife shaft could be 2.49e5h.Knife shaft assembly welding,located in Knife shaft ends,was first place to appear fatigue failure.The experiment demonstrated that the result of presented method was accord with the qualitative analysis.Therefore the paper can provide important reference for knife shaft reliability optimization and fatigue design.
出处
《中国农机化学报》
北大核心
2013年第3期78-83,共6页
Journal of Chinese Agricultural Mechanization
基金
国家"十二五"农村领域国家科技计划课题(2011BAD20B03)
江苏省产学研前瞻性项目(BY2010130)
江苏省农机三新工程(NJ2012-11)
江苏省研究生创新基金(CXLX11_1002)
关键词
旋耕机
刀轴
NX
NASTRAN
模态分析
疲劳
rotary cultivator
rotary cutter shaft
NX NASTRAN
modal analysis
fatigue
