摘要
对随机风场进行了模拟,得到了正常发电工况下主轴扭矩的时间历程;建立了齿轮副的三维有限元模型,计算了在静态载荷下齿轮副的应力应变。采用随机载荷雨流计数法对齿轮载荷进行雨流计数,并对结果进行了统计学分析,得到应力均值符合三参数威布尔分布。研究了服从三参数威布尔分布的分布参数对齿轮接触疲劳裂纹萌生寿命的影响。结果表明采用随机载荷相对于采用载荷均值齿轮的接触疲劳裂纹萌生寿命疲劳寿命下降,形状参数增大齿轮接触疲劳裂纹萌生寿命增大,尺度参数和位置参数增大齿轮的接触疲劳裂纹萌生寿命减小。
Stochastic wind field is simulated and time series of main shaft torque under normal condition of power generation is obtained. 3D contact finite element model of gear pair is built to calculate stress -strain of gear pair under static load. The random load of rain-flow counting statistics is used to count for random loads, the results are statistically analyzed, and mean stress obtained is in accordance with the three parameter weibull distribution. The influence on the distribution parameters of Weibull distribution with three parameters of the gear contact fatigue crack initiation life is studied. Results show that the random load compared with the mean load of gear contact fatigue crack initiation life decreased. The contact fatigue crack initiation life increases with shape parameter increased, reduces with scale and location parameters increased.
出处
《机械设计与制造》
北大核心
2014年第6期119-122,共4页
Machinery Design & Manufacture
基金
国家科技支撑计划课题(2012BAA01B05)
国际科技合作专项项目(2013DFA70730)
关键词
随机载荷
接触疲劳
裂纹萌生寿命
有限元法
Random Load
Contact Fatigue
Crack Initiation Life
Finite Element Method
