Faculty Publications

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Author: search.filters.author.Gupta, S.Subject: search.filters.subject.Availability

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    Simulation modeling and analysis of a complex system of a thermal power plant
    (Universitat Politecnica de Catalunya editor@jiem.org, 2009) Gupta, S.; Tewari, P.C.
    The present paper deals with the opportunities for the modeling of flue gas and air system of a thermal power plant by making the performance evaluation using probabilistic approach. The present system of thermal plant under study consists of four subsystems with three possible states: full working, reduced capacity working and failed. Failure and repair rates for all the subsystems are assumed to be constant. Formulation of the problem is carried out using Markov Birth-Death process using probabilistic approach and a transition diagram represents the operational behavior of the system. Interrelationship among the full working and reduced working states has been developed. A probabilistic model has been developed, considering some assumptions. Data in feasible range are selected from a survey of thermal plant and the effect of each subsystem on the system availability is tabulated in the form of availability matrices, which provides various performance/availability levels for different combinations of failure and repair rates of all subsystems. Based upon various availability values obtained in availability matrices and graphs of failure/repair rates of different subsystems, performance and optimum values of failure/repair rates for maximum availability, of each subsystem is analyzed and then maintenance priorities are decided for all subsystems. © JIEM, 2009.
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    A two identical unit standby system with inspection, two types of repair and delayed replacement of standby
    (DAV College rkishan05@rediffmail.com 606-10 D.A.V (P.G) College Flats, Muzzaffarnagar 251-001, 2019) Gupta, S.; Chaudhary, P.; Vaishali
    The paper deals with reliability and profit function analysis of a two identical unit standby system model with two modes- Normal and Total failure of each unit. Initially one unit is operative and the other is kept into cold standby. Upon failure of the operative unit the standby unit takes a random time to replace the operative unit. The time is called the delay time for replacement of the operative unit. Inspection is required to detect the type of failure after which the type of repair (either Type-1 or Type-2) is made. Whenever, the operative unit fails, a repairman is called to come at the system for the replacement of failed operative unit with standby and he takes some significant time to reach at the system. Failure time distribution is taken as exponential. The repair and inspection time distributions are also taken as exponential. Whereas the arrival and replacement time distribution are taken as general. By using supplementary variable technique, the various important measures of system effectiveness have been obtained. © 2019 DAV College. All rights reserved.