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

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Design of testing period for reliability assessment of NC machine tools

LI Hong-zhou1,2, YANG Zhao-jun1, XU Bin-bin1, WANG Yan-kun1, JIA Yu-hui1, HOU Chao1   

  1. 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

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

CLC Number: 

  • TG659
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