Hierarchical Risk Assessment Method for CNC System
To meet the requirements of safety of Computer Numerical Control( CNC) system,a hierarchical risk assessment method w as presented. The hierarchical model of CNC system w as proposed,and an assessment sequences set matrix w as deeply researched w ith the corresponding fuzzy mapping algorithm to quantize the expert experience. A layered diffusion method of factor w eights w as proposed to locate key risk factors,and a horizontal fragmentation method w as adopted to calculate the risk degree of CNC system.And then case studies w ere adopted to compare the performance betw een the digraph and matrix method and the new mechanism. The results proved that the new mechanism could decrease the similarity performance,reduce the execution time,and be more suitable for the application of risk assessment process in CNC systems.