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针对数控系统中复杂特性对安全性能的需求,提出一种递阶式风险评估方法.给出递阶式层次结构模型将复杂系统逐级分解简化,构建评估序列集矩阵以融合各层级专家经验,设计序列集模糊映射方法将专家经验进行量化,从而获取各层级中因素权重,然后从顶层开始将各层级因素权重进行逐层传播扩散直至底层,从而定位关键风险因素;同时辅以水平分片法,与安全等级匹配规则集相结合,确定数控系统风险程度等级.最后采用实际案例对所提出方法和有向图矩阵法进行性能对比,结果证明该方法能够有效减少评估结果相似度,降低评估时间,适合于数控系统风险评估过程的应用.
Aiming at the requirement of the complex features in the numerical control system for the safety performance, a hierarchical risk assessment method is proposed.Hierarchical hierarchical model is given to simplify the complex system step by step, construct the evaluation sequence matrix to integrate expert experience at all levels, Design sequence set fuzzy mapping method to quantify the experience of experts to obtain the weight of the factors in all levels, and then from the top of the hierarchy of factors to spread the level of weight diffusion until the bottom, so as to locate the key risk factors; supplemented by the horizontal slice method , Combined with the security level matching rule set to determine the level of risk of the numerical control system.Finally, the performance of the proposed method and the directed graph matrix method is compared with the actual case, the results show that this method can effectively reduce the similarity of evaluation results and reduce the evaluation time , Suitable for numerical control system risk assessment process application.