数控机床可靠性评估试验周期设计

doi:10.13229/j.cnki.jdxbgxb201605020

吉林大学学报(工学版) ›› 2016, Vol. 46 ›› Issue (5): 1520-1527.doi: 10.13229/j.cnki.jdxbgxb201605020

数控机床可靠性评估试验周期设计

李洪洲^1,2, 杨兆军¹, 许彬彬¹, 王彦鹍¹, 贾玉辉¹, 侯超¹

1.吉林大学机械科学与工程学院,长春 130022;
2.北华大学机械工程学院,吉林省吉林市 132011

收稿日期:2015-09-18 出版日期:2016-09-20 发布日期:2016-09-20
通讯作者: 杨兆军(1956-),男,教授,博士生导师.研究方向:数控装备可靠性理论.E-mail:yzj@jlu.edu.cn
作者简介:李洪洲(1974-),男,副教授,博士研究生.研究方向:数控机床可靠性.E-mail:yinshun_9999@163.com
基金资助:
国家科技重大专项项目(2013ZX04011-012).

Design of testing period for reliability assessment of NC machine tools

LI Hong-zhou^1,2, YANG Zhao-jun¹, XU Bin-bin¹, WANG Yan-kun¹, JIA Yu-hui¹, HOU Chao¹

1.College of Mechanical Science and Engineering,Jilin University,Changchun 130022,China;
2.College of Mechanical Engineering,Beihua University,Jilin 132011,China

Received:2015-09-18 Online:2016-09-20 Published:2016-09-20

摘要/Abstract

摘要： 针对数控机床可靠性评估试验时由于试验周期难以确定而造成的试验成本升高或评估精度降低的问题,提出了一种基于Bootstrap重抽样的试验周期设计方法。该方法以平均故障间隔工作时间(MTBF)的区间估计变化率作为判定试验周期长度的依据,以Bootstrap重抽样方法求解数控机床MTBF的区间估计,以Power函数建立了MTBF区间估计变化率模型,得到了可靠性评估试验的试验周期。结合实例分析了机床台数m和形状参数β对试验周期的影响:随着形状参数β或被试机床台数m的增加,可靠性评估试验的试验周期缩短。

关键词: 数控机床, Bootstrap, 试验周期, 区间估计

Abstract: To overcome the problem that the difficulty in determining the testing period for reliability assessment of NC machine tools increases the testing cost or decreases the assessment accuracy, a new method to determine the testing period is proposed based on Bootstrap re-sampling. This method uses the change rate of interval estimate of Mean Time between Failures (MTBF) as the basis for determining the testing period, and then calculates the interval estimate of MTBF using Bootstrap re-sampling. The model of change rate for interval estimate of MTBF is established by power function, and the testing period for the reliability assessment of NC machine tools is obtained. Two factors influencing the testing period, the number of machine tools and shape parameter, are analyzed in combination with the real case. Results indicate that with increase in the shape parameter and the number of tools, the testing period of reliability assessment is shortened.

Key words: NC machine tools, Bootstrap, testing period, interval estimation

中图分类号:

TG659

李洪洲, 杨兆军, 许彬彬, 王彦鹍, 贾玉辉, 侯超. 数控机床可靠性评估试验周期设计[J]. 吉林大学学报(工学版), 2016, 46(5): 1520-1527.

LI Hong-zhou, YANG Zhao-jun, XU Bin-bin, WANG Yan-kun, JIA Yu-hui, HOU Chao. Design of testing period for reliability assessment of NC machine tools[J]. 吉林大学学报(工学版), 2016, 46(5): 1520-1527.

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数控机床可靠性评估试验周期设计

Design of testing period for reliability assessment of NC machine tools

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