Blar i Institutt for maskinteknikk og produksjon på forfatter "Kassa, Elias"
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A Degrading Element of Safety-instrumented Systems with Combined Maintenance Strategy
Zhang, Aibo; Liu, Yiliu; Barros, Anne; Kassa, Elias (Chapter, 2019)Safety-instrumented systems (SISs) are widely used to prevent hazardous events. The mechanical actuator subsystem in a SIS can become more vulnerable with time due to progressive degradation mechanisms, such as erosion, ... -
Functional Safety of Railway Signaling Systems: Performance Requirements and Evaluation Methods
Zhang, Aibo; Jiang, Lei; Xie, Min; Kassa, Elias; Liu, Yiliu (Chapter, 2021)Signaling is fundamental to the safe operation of the railway, ensuring that trains are spaced safely apart and conflicting movements are avoided. Railway signals are `traffic light' devices, which tell a train driver if ... -
Performance Assessment of Safety-instrumented Systems Subject to Cascading Failures in High-demand Mode
Xie, Lin; Lundteigen, Mary Ann; Liu, Yiliu; Kassa, Elias; Zhu, Shengyang (Chapter, 2019)Safety-instrumented systems are designed to act upon hazardous events and reinforce safety. IEC 61508 specifies two possible reliability measures of safety-instrumented systems: the average probability of failure on demand ...