Asian Science Citation Index is committed to provide an authoritative, trusted and significant information by the coverage of the most important and influential journals to meet the needs of the global scientific community.  
ASCI Database
308-Lasani Town,
Sargodha Road,
Faisalabad, Pakistan
Fax: +92-41-8815544
Contact Via Web
Suggest a Journal
Articles by Yanli Zhang
Total Records ( 1 ) for Yanli Zhang
  Yanli Zhang , Jun Dai and Dasheng Zhu
  It is necessary to calculate the "Probability of Failure on Demand" (PFD) and "Probability of Failure of Safety" (PFS) for the assessment of the "Safety Integrity Level" (SIL) of a Safety Instrumented System (SIS) in the international standard IEC 61508 (2000). To fulfill the high safety and availability requirements redundant channels are often used which are normally homogeneous. Whereas, in order to minimize the potential Common Cause Failures (CCF) for very high safety requirements (e.g. SIL4) it may be advisable to build up a heterogeneous system with different hardware/software platforms. For such type of heterogeneous systems the calculation of the PFD is a challenge because the failure rates of the particular channels are different in general and no formulas are included in the standard. Within the scope of this work, the physical block diagram and the voting diagram for 2oo3 redundant system are introduced, then based on them, the Markov-model method is used to simulate these redundant systems, including both the homogeneous and the heterogeneous systems.
Copyright   |   Desclaimer   |    Privacy Policy   |   Browsers   |   Accessibility