郭秩维,曹航,李瑾亮,郭勇.基于泊松分布的轮盘多危险部位定寿方法[J].航空发动机,2020,46(4):65-70
基于泊松分布的轮盘多危险部位定寿方法
Life Determination Method for Disk Multi-dangerous Sites Based on Poisson Distribution
  
DOI:
中文关键词:  轮盘  疲劳寿命  试验评定  对数正态分布  泊松分布  分散系数  航空发动机
英文关键词:disk  fatigue life  experimental assessment  logarithm normal distribution  Poisson distribution  scatter factors  aeroengine
基金项目:航空动力基础研究项目资助
作者单位E-mail
郭秩维,曹航,李瑾亮,郭勇 中国航发沈阳发动机研究所沈阳110015 4385672@qq.com 
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中文摘要:
      在航空发动机轮盘低循环疲劳寿命评估试验中,针对基于中位、最小和最大寿命的寿命分散系数存在预估可靠寿命偏 低的问题,根据失效部位出现次数服从泊松分布的假设和次序统计量理论,推导了1 种新轮盘寿命散度计算公式,并提出1 种轮 盘安全寿命的估计方法。通过数值算例对比了该方法与基于中位、最小和最大寿命、单侧容限系数法、新单侧容限系数法在预测安 全寿命精度上的差异。结果表明:新方法相对于其它方法能够给出更接近真实安全寿命的估计值。
英文摘要:
      Aiming at the problem that the life scatter factors based on the life of median,minimum and maximum were low in predicting the reliable life in the low cycle fatigue life evaluation test of aeroengine disk,a new calculation formula of life divergence of disk was derived and a method for estimating the safe life of disk was proposed based on the assumption that the number of failure parts obeyed Poisson distribution and the theory of order statistics. The differences between the method and the method based on the life of median, minimum and maximum,one-side tolerance factor method and new one-side tolerance factor method in predicting safety life were compared by numerical example. The results show that the new method can estimate the real safe life better than other methods
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