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Analysis method for reliability of numerical control equipment based on hidden Markov chain

An analysis method and reliability technology, applied in the direction of program control, computer control, general control system, etc., can solve the real-time changes and large number of problems that cannot understand the reliability of numerical control equipment

Inactive Publication Date: 2009-09-02
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0004] However, the main problems faced by the reliability research of CNC equipment based on fault data are: on the one hand, it needs a large amount of fault and life data to find the life distribution curve of CNC equipment
This makes it impossible for users to understand the real-time changes in the reliability of CNC equipment

Method used

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  • Analysis method for reliability of numerical control equipment based on hidden Markov chain
  • Analysis method for reliability of numerical control equipment based on hidden Markov chain
  • Analysis method for reliability of numerical control equipment based on hidden Markov chain

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Embodiment

[0075] This embodiment provides a specific implementation process of the present invention in engineering practice, and at the same time verifies the effectiveness of the present invention.

[0076] Refer to Figure 4, Taking Outai OTM-650 CNC milling machine as the research object, by simulating the deterioration of the circular motion accuracy caused by the backlash of the equipment, infer the law of the reliability change of the CNC equipment. The test equipment includes Othai OTM-650 CNC milling machine, Huazhong "Century Star" CNC system HMC-21M, Heidenhain KGM182 plane grating measuring device and ordinary PC. Among them, the plane grating KGM182 is a high-precision test instrument used for non-contact measurement of the two-dimensional motion profile accuracy of equipment. Through NC programming, the worktable makes a counterclockwise / clockwise circular movement in the XOY plane with a radius of 50mm and a feed speed of 2000mm / min, and a plane grating is used to measure the ...

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Abstract

The invention provides an analysis method for reliability of numerical control equipment based on a hidden Markov chain. The method particularly comprises the following steps: 1, monitoring dynamic performance signals of the numerical control equipment, and abstracting the performance characteristic parameter values showing the change of the reliability of the numerical control equipment; 2, constructing a predictive model of the performance characteristic parameter values; 3, using the predictive model to predict the performance characteristic parameter values within the time needed for vectorization, and adopting the source coding method to vectorize the predictive values of the performance characteristic parameter values; 4, adopting the discrete hidden Markov chain model to identify the state transition probability of the numerical control equipment; and 5, utilizing the Chapman-Kolmogorov differential equation to establish a relational expression of the operational state and the state transition probability so as to deduce the probability of the numerical control equipment in different operating states, namely obtaining the reliability of the numerical control equipment. The method can accurately analyze, evaluate and predict the change of the reliability of the numerical control equipment before the numerical control equipment goes wrong, thereby avoiding the fault of the numerical control equipment and improving the operational reliability of the numerical control equipment.

Description

Technical field [0001] The invention belongs to the technical field of numerical control equipment, and specifically is a method for analyzing reliability changes of numerical control equipment based on a discrete hidden Markov chain model. Background technique [0002] Reliability is an inherent attribute of CNC equipment, and it is the ability of index control equipment to perform various key functions of its required tasks within a specified time under specified tasks and conditions. It reflects the quality characteristics of the CNC equipment during use, and takes into account the time and environmental factors of the CNC equipment during its operation. [0003] At present, the general idea of ​​the reliability analysis of CNC equipment is to collect and analyze the design and manufacturing information of the components of the CNC equipment and the complete machine system, field fault data, and historical fault and life data of similar products. Start with, look for failure m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/406
Inventor 吴军李宝仁
Owner HUAZHONG UNIV OF SCI & TECH
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