This paper deals with modeling and analysis of complex mechanical systems that deteriorate age. As age, the questions on their availability reliability start to surface. The system is believed suffer from internal stochastic degradation mechanism described as a gradual continuous process performance deterioration. Therefore, it becomes difficult for maintenance engineer model such system. Semi-...

ÐThe transient analysis of large continuous time Markov reliability models of repairable fault-tolerant systems is computationally expensive due to model stiffness. In this paper, we develop and analyze a method to compute bounds for a measure defined on a particular, but quite wide, class of continuous time Markov models, encompassing both exact and bounding continuous time Markov reliability ...

This paper presents a mathematical model for performing availability and reliability analysis of a parallel repairable system consisting of n identical components with degradation facility and common-cause failures. In addition, system repair time is assumed to be arbitrarily distributed. Markov and supplementary variable techniques are used to develop equations for the model. As an illustratio...

In most cases, Model Based Safety Analysis (MBSA) of critical systems focuses only on the process and not on the control system of this process. In this paper, we claim that, for complex controlled systems, not only the process but the whole closedloop system Process/Control must be considered to perform a relevant MBSA. As one of the aim of the control system is to manage the numerous switchin...

The productivity and quality requirements have conducted the manufacturing systems to be more and more complex. Indeed, many sub-systems are in interaction such that the process system, the control system and the supervision or diagnosis system. The dependability and availability analysis in those systems is of a major importance, since they impact directly on system’s productivity and safety. ...

This study considers the inspection and maintenance of boiler heat exchangers, which are examples a system composed degrading, non-repairable components in series whose operation can be restored by removing failed from service (albeit at performance loss). For such systems, increased failure risk due to component degradation may managed through inspections preventive removal high (again loss fo...

This paper discusses the performance evaluation and availability analysis of ammonia synthesis unit of a fertilizer plant. The fertilizer plant is a complex and repairable engineering system comprises of various units viz. shell gasification and carbon recovery, desulphurization, co-shift conversion, decarbonation, nitrogen wash and ammonia synthesis etc. One of the most important functionaries...