Importance Analysis of a Multi-state System Based on Direct Partial Logic Derivatives and Multi-valued Decision Diagrams

• Published in: 东华大学学报（英文版） Vol. 31; no. 6; pp. 789 - 792
• Main Author: 古莹奎 李晶
• Format: Journal Article
• Language: English
• Published: School of Mechanical and Electronical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China 31.12.2014
• Subjects: direct partial logic derivative (DPLD); multi-valued decision diagram (MDD); multi-state system (MSS); reliability; diesel engine fuel supply system; importance analysis
• ISSN: 1672-5220

Importance analysis quantifies the critical degree of individual component. Compared with the traditional binary state system,importance analysis of the multi-state system is more aligned with the practice. Because the multi-valued decision diagram（ MDD） can reflect the relationship between the components and the system state bilaterally, it was introduced into the reliability calculation of the multi-state system（ MSS）. The building method,simplified criteria,and path search and probability algorithm of MSS structure function MDD were given,and the reliability of the system was calculated. The computing methods of importance based on MDD and direct partial logic derivatives（ DPLD） were presented. The diesel engine fuel supply system was taken as an example to illustrate the proposed method. The results show that not only the probability of the system in each state can be easily obtained,but also the influence degree of each component and its state on the system reliability can be obtained,which is conducive to the condition monitoring and structure optimization of the system.