作者：王永南1, 穆希辉2, 牛跃听2, 杜峰坡2, 陈建华1
作者单位：1. 军械工程学院, 河北 石家庄 050003;
2. 军械技术研究所, 河北 石家庄 050003
关键词：加速度计;自然贮存;变环境数据;环境因子;寿命评估
摘要：
为解决某型加速度计在变温度检测数据条件下贮存寿命评估精度不高的问题,考虑到其性能退化失效受温度影响大且检测数据有多个温度阶梯,提出基于Arrhenius模型确定环境因子并用来修正变温度检测数据的方法。首先,假设检测数据服从的分布,利用极小2估计与Pearson拟合优度检验确定出最优分布;根据温度差异分别求出最优分布下的模型参数,并确定出可信度最高的一组数据;将模型参数代入Arrhenius模型求得环境因子,并用其将所有检测数据折合到可信度最高的数据中,最后利用修正后的数据进行寿命预测。计算结果表明:以上方法可以有效提高加速度计贮存寿命预测的准确度,从而证明方法的可行性。
Varied environment data amendment and life assessment of a certain type of accelerometer
WANG Yongnan1, MU Xihui2, NIU Yueting2, DU Fengpo2, CHEN Jianhua1
1. Ordnance Engineering College, Shijiazhuang 050003, China;
2. Ordnance Engineering Institute, Shijiazhuang 050003, China
Abstract: To improve the precision in the storage lifetime evaluation of a certain type of missile-borne accelerator under the condition of varying temperature testing data, a method using an Arrhenius model to determine environmental factors is proposed and applied to correct the data in consideration of that the performance degradation failure of the accelerator is influenced significantly by temperature and the testing data can be classified by multiple temperature gradients. First, minimum χ2 estimation and Pearson goodness of fit are used to determine the optimal distribution under the assumption that the testing data obeys the distribution. Second, model parameters are worked out under the optimal distribution according to temperature differences and to determine the most credible data set. Third, environmental factors are calculated by putting the model parameters into the Arrhenius model. Fourth, all the testing data are converted into the data set confirmed above through these environmental factors, and then all the testing data are corrected to predict the storage lifetime. The computed results show that the precision in life prediction is significantly improved by the method proposed above. It is proved that the method is feasible.
Keywords: accelerometer;natural storage;varied environment data;environmental factor;life evaluation
2016, 42(4): 125-131 收稿日期: 2015-09-26;收到修改稿日期: 2015-10-13
基金项目: 国家自然科学基金(61471385)
作者简介: 王永南(1990-),男,山西大同市人,硕士研究生,专业方向为弹药可靠性工程。
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