Functional Availability Modelling of CNC Machine Tools

Abstract:

A new method for calculating the instantaneous availability was proposed based on Functional Data Analysis method. It introduced the Quadratic Bernstein Polynomial into the smoothing method firstly for the reliability which estimated by median rank method and estimated the fitting parameters by least square method. Then, under the assumption that the maintenance difficult of the CNCs was decreasing over the work time, chosen the appropriate smoothing basis function based on the trend after the time section adjustment for the estimated maintainability value. The Fourier basis system and the non-linear least squares were selected for the maintainability function smoothing method and the fitting parameters. Finally, the instantaneous availability model of CNCs was built based on the functional linear regression method, and a case example of 15 CNCs was given.

• Periodical: Advanced Materials Research (Volumes 915-916)
• Pages: 395-399
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.915-916.395
• Online since: April 2014
• Authors: Xiao Bing Li, Jun Gao, Zheng Zhang, Xiao Cui Zhu
• Keywords: CNC Machine Tool, Instantaneous Availability, Least-Square Method (LSM)

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