Proportional hazard rate model method for estimating operation reliability of tool

A failure rate and reliability technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of inconsistent equipment operating conditions, difficulty in obtaining failure life data, etc., and achieve good real-time performance and evaluation results. reliable results

Inactive Publication Date: 2011-11-23
XIAN TECHNOLOGICAL UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to provide a proportional failure rate model method for tool operation reliability evaluation, so as to overcome the difficulty in obtaining failure life data existing in the prior art, which is not very consistent with the actual operating conditions of the equipment, and cannot provide timely preventive maintenance. Shortcomings

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  • Proportional hazard rate model method for estimating operation reliability of tool
  • Proportional hazard rate model method for estimating operation reliability of tool
  • Proportional hazard rate model method for estimating operation reliability of tool

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[0062] figure 1 Vibration signal and its frequency spectrum from t=84min to t=104min when machining workpiece for tool 1, it can be seen from the figure that the energy of the signal is mainly concentrated in the frequency band between 3000 and 9000Hz. figure 2 It is the time-domain index change diagram of tool 1. It can be observed that during the tool degradation processing time, the effective value (RMS) and peak value (P) change trends are obvious, and the kurtosis (K) and peak index (CF) change trends Not very obvious.

[0063] image 3 Vibration signal and its frequency spectrum from t=75min to t=100min when machining workpiece for tool 2, it can be seen from the figure that the energy of the signal is mainly concentrated in the frequency band between 3000 and 9000Hz. Figure 4 It is the time-domain index change diagram of tool 2. It can be observed that during the tool degradation processing time, the effective value (RMS) and peak value (P) change trends are more...

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Abstract

The invention relates to a proportional hazard rate model method for estimating operation reliability of a tool. Defects of difficulty in obtaining burn-out life data, incomplete matching with actual operation conditions of equipment and incapability of timely prevention and maintenance exist in the prior art. According to the technical scheme provided by the invention, the proportional hazard rate model method for estimating operation reliability of the tool comprises the following operation steps of: 1, using an effective value (RMS (Root Mean Square)) and a peak value (P) in a characteristic signal as covariates in a proportional hazard rate model; 2, calculating model parameters according to a nonlinear equation described in the specification; and 3, obtaining parameter results of maximum likelihood estimation of the tool working in different regressive states by applying a maximum likelihood estimation method of the proportional hazard rate model, and solving a current hazard rate according to state signals of the processing system tool working in different regressive states and finally obtaining the reliability. The method has the advantages of good instantaneity and reliable estimation result.

Description

technical field [0001] The invention belongs to the field of electromechanical equipment operation state monitoring and reliability engineering, and specifically relates to a proportional failure rate model reliability evaluation method for the operation state of digital manufacturing equipment, and further relates to a proportional failure rate model method for tool operation reliability evaluation. Background technique [0002] Traditional reliability modeling, analysis, and evaluation 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 economical. The most important thing is that 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 signif...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 丁锋何正嘉
Owner XIAN TECHNOLOGICAL UNIV
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