Stepwise type risk assessment method used for numerical control system

Abstract

The invention relates to a stepwise type risk assessment method used for a numerical control system. The stepwise type risk assessment method used for the numerical control system comprises the following steps: conducting step-by-step decomposition and simplifying on a the numerical control system according to a stepwise type layer level structure, experts providing an assess sequence set according to various assessment criteria, meanwhile conducting horizontal zoning according to an assessment level; blending expert advice, obtaining a risk degree sequence matrix and a horizontal zoning scheme under different assessment criteria; conducting vague mapping on the sequence set aiming at the risk degree sequence matrix, obtaining a factor level risk degree weight matrix under a single assessment criterion, and calculating a component level risk weight matrix under the single assessment criterion; conducting weight blending on different assessment criteria, obtaining the factor level risk degree weight matrix and the component level risk weight matrix, and positioning major risk components and a key risk factor; conducing security level rule matching aiming at the horizontal zoning scheme, and obtaining a risk level assessment result of each layer of the numerical control system. The stepwise type risk assessment method used for the numerical control system has the advantages of being low in artificial subjective error, high in automation degree, small in expert workload and the like.

Description

technical field [0001] The invention relates to the technical field of risk assessment, in particular to a hierarchical risk assessment method for a numerical control system. Background technique [0002] With the continuous development of the manufacturing industry, the complexity of the CNC system is constantly increasing, which also increases the probability of accidents. Therefore, in order to protect personal property from damage, safety has become one of the key points in the research of numerical control system. According to the definition of the international standard IEC 61508, safety means that there is no unacceptable risk. Therefore, research on safety can be converted into an assessment on risk. Therefore, as one of the main technical tools to measure the safety performance of CNC systems, risk assessment methods have become a hot spot in current research. [0003] At present, the risk assessment methods for machinery in related research fields at home and abr...

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Problems solved by technology

[0003] At present, the risk assessment methods for machinery in related research fields at home and abroad mainly use the expert scoring method to directly assign values. Experts are required to give their own assessment levels according to each assessment criterion for each risk event. For those with high complexity The numerical control system, its risk events are abstract and numerous, this evaluation method is easy to make the experts have inconsistent standards in the evaluation process, resulting in subjective errors

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