| 引用本文: | 王智明,杨建国,王国强,张根保.多台数控机床的时间截尾可靠性评估[J].哈尔滨工业大学学报,2011,43(3):85.DOI:10.11918/j.issn.0367-6234.2011.03.018 |
| WANG Zhi-ming,YANG Jian-guo,WANG Guo-qiang,ZHANG Gen-bao.Reliability evaluation of multiple NC machine tools with time truncation[J].Journal of Harbin Institute of Technology,2011,43(3):85.DOI:10.11918/j.issn.0367-6234.2011.03.018 |
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| 摘要: |
| 为了评估数控(NC)机床的可靠性,提出了用AIC、BIC信息准则选择多台NC机床故障间隔时间的分布模型和模型参数的方法.用Fisher信息矩阵法(FM)给出了模型参数和机床平均寿命的可靠度及可靠度为90%时的工作保证时间的区间估计,用Monte Carlo(MC)仿真法扩大少样本数据的样本容量,提高了区间估计的精度.结果表明,平均寿命的可靠度及可靠度为90%时的工作保证时间的区间估计长度分别减少了93%、95%. |
| 关键词: 多台数控机床 时间截尾 可靠性评估 信息准则 置信区间 |
| DOI：10.11918/j.issn.0367-6234.2011.03.018 |
| 分类号:O213.2 |
| 基金项目:高等学校全国优秀博士学位论文作者专项资金资助项目(200131);“高档数控机床与基础制造装备”科技重大专项资助项目(2009ZX04014-016) |
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| Reliability evaluation of multiple NC machine tools with time truncation |
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WANG Zhi-ming1, YANG Jian-guo1, WANG Guo-qiang2, ZHANG Gen-bao2
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1.School of Mechanical Engineering,Shanghai Jiaotong University,200240 Shanghai,China;2.Advanced Manufacturing Technology laboratory,College of Mechanical Engineering,Chongqing University,400030 Chongqing,China)
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| Abstract: |
| To evaluate the reliability of NC machine tools,based on AIC and BIC information criteria,a method of model selection and parameter estimation for time-between-failures of multiple NC machine tools with time truncation is proposed.The confidence intervals of model parameters,the reliability given MTBF(mean time between failures) and the warranty time with 90% reliability are all given by Fisher Information Matrix method.At last,Monte Carlo simulation method is used to enlarge sample size of small-sample data to improve the precision of interval estimation.The results show that the interval length of reliability given MTBF and warranty time with 90% reliability are both reduce by 95% and 93% respectively. |
| Key words: multi-NC machine tools time truncation reliability evaluation information criterion confidence interval Monte Carlo(MC) |
