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Estimation method for operational reliability of numerical control machine based on proportional hazards model

A CNC machine tool, failure rate technology, applied in metal processing mechanical parts, measuring/indicating equipment, metal processing equipment, etc., can solve problems such as no one raised

Inactive Publication Date: 2011-09-14
XIAN RUITE RAPID MFG ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this evaluation method has not been proposed so far.

Method used

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  • Estimation method for operational reliability of numerical control machine based on proportional hazards model
  • Estimation method for operational reliability of numerical control machine based on proportional hazards model
  • Estimation method for operational reliability of numerical control machine based on proportional hazards model

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Experimental program
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Embodiment Construction

[0049] The present invention is described in detail below in conjunction with accompanying drawing.

[0050] The method for evaluating the reliability of CNC machine tool operation based on the proportional failure rate model includes the following steps:

[0051] Step 1. Use the characteristic signal reflecting the operating state of the equipment, and select the four values ​​of the effective value, peak value, kurtosis, and peak index in the characteristic signal as covariates in the proportional failure rate model;

[0052] The described use of the characteristic signal reflecting the operating state of the equipment, and the selection of the four values ​​of the effective value, peak value, kurtosis, and peak index in the characteristic signal as covariates in the proportional failure rate model include the following steps:

[0053] Suppose a signal sequence S=(s 1 ,s 2 ,...,s t ,...,s T ), T is the signal length, then the RMS, peak, kurtosis, and peak indicators are ...

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Abstract

The invention relates to an estimation method for operational reliability of a numerical control machine based on a proportional hazards model, comprising the following steps: step I, using a characteristic signal for reflecting the operational state of the equipment and selecting the effective value, the peak value, the peakedness and the peak value in the characteristic signal as covariant in the proportional hazards model; step II, carrying out reliability parameter estimation to the parameters in the proportional hazards model, carrying out solving by using a maximum likelihood estimation method, so as to obtain the current failure rate and realize the estimation to indexes such as the reliability. In the invention, the real-time performance is good, the estimation result is reliable, thereby being a new method for the traditional reliability estimation; the method is suitable for real-time reliability estimation for the equipment operating process.

Description

technical field [0001] The invention relates to the fields of equipment operation state monitoring and reliability engineering, in particular to a numerical control machine tool operation reliability evaluation method based on a proportional failure rate model. Background technique [0002] Traditional reliability modeling and analysis methods are generally based on classic probability and statistics. It is necessary to conduct a large-sample life test on the equipment and count the life distribution data of the equipment. This method is not only time-consuming and labor-intensive, but also poor in economy. The traditional reliability analysis method obtains the overall reliability of the equipment. For a single or small batch of equipment in operation, these statistical data are of little significance. People are more concerned about the life margin and safety reliability of the equipment currently in use. . Traditional reliability assessment methods based on probability a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23Q17/00
Inventor 何正嘉訾艳阳陈雪峰李兵张周锁丁峰陈保家
Owner XIAN RUITE RAPID MFG ENG
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