Simulation and Economic Analysis of Coal Based Thermal Power Plant: A Critical Literature Review

ABSTRACT: Coal based fired power plant is a very complex unit. Today's electric energy is playing an important role in the industria

Contribution à la commande sûre des Systèmes à Événements Discrets

Les activités de recherche rentrent dans le spectre de la section 61 du CNU et ont pour domaine l’Automatique des Systèmes à Événements Discrets (SED). Elles sont conduites en vue d’accroître la sûreté de fonctionnement des systèmes automatisés comme ceux qu’il est possible de trouver dans le cadre de la production manufacturière, de la production d'énergie ou du transport. Une grande partie de ces recherches a concerné la conception sûre des systèmes de contrôle-commande à base d’Automates Programmables Industriels (API) et plus particulièrement les thématiques suivantes :- la vérification formelle de programmes de contrôle-commande,- la synthèse algébrique de programmes de contrôle-commande à partir de spécifications informelles,- le test de conformité d’un contrôleur logique vis-à-vis de sa spécification.D'autres recherches ont porté sur la formalisation des outils pour l’analyse de sûreté, utilisés dans le cadre de l’analyse prévisionnelle des risques d’un équipement ou d’une installation industrielle. Cette formalisation des outils utilisés en sûreté a été faite en examinant avec un point de vue SED une problématique qui ne l’était pas à son origine. Il a été étudié :- la modélisation algébrique des arbres de défaillances dynamiques,- l’analyse prévisionnelle des risques d’un point de vue qualitatif pour les systèmes réparables à partir de Boolean logic Driven Markov Processes (BDMPs),- l’analyse prévisionnelle des risques d’un point de vue quantitatif pour les systèmes réparables à l’aide de chaînes de Markov.D'une manière générale, ces activités de recherche ont pour objectif de proposer des apports formels ou méthodologiques à des outils de modélisation généralement issus de l’industrie tout en répondant à des besoins industriels déjà présents ou sur le point de le devenir

Methods for the efficient measurement of phased mission system reliability and component importance

An increasing number of systems operate over a number of consecutive time periods, in which their reliability structure and the consequences of failure differ, in order to perform some overall operation. Each distinct time period is known as a phase and the overall operation is known as a phased mission. Generally, a phased mission fails immediately if the system fails at any point and is considered a success only if all phases are completed without failure. The work presented in this thesis provides efficient methods for the prediction and optimisation of phased mission reliability. A number of techniques and methods for the analysis of phased mission reliability have been previously developed. Due to the component and system failure time dependencies introduced by the phases, the computational expense of these methods is high and this limits the size of the systems that can be analysed in reasonable time frames on modern computers. Two importance measures, which provide an index of the influence of each component on the system reliability, have also been previously developed. This is useful for the optimisation of the reliability of a phased mission, however a much larger number have been developed for non-phased missions and the different perspectives and functions they provide are advantageous. This thesis introduces new methods as well as improvements and extensions to existing methods for the analysis of both non-repairable and repairable systems with an emphasis on improved efficiency in the derivation of phase and mission reliability. New importance measures for phased missions are also presented, including interpretations of those currently available for non-phased missions. These provide a number of interpretations of component importance, allowing those most suitable in a given context to be employed and thus aiding in the optimisation of mission reliability. In addition, an extensive computer code has been produced that implements and tests the majority of the newly developed techniques and methods.EThOS - Electronic Theses Online ServiceGBUnited Kingdo

Methods for the efficient measurement of phased mission system reliability and component importance

An increasing number of systems operate over a number of consecutive time periods, in which their reliability structure and the consequences of failure differ, in order to perform some overall operation. Each distinct time period is known as a phase and the overall operation is known as a phased mission. Generally, a phased mission fails immediately if the system fails at any point and is considered a success only if all phases are completed without failure. The work presented in this thesis provides efficient methods for the prediction and optimisation of phased mission reliability. A number of techniques and methods for the analysis of phased mission reliability have been previously developed. Due to the component and system failure time dependencies introduced by the phases, the computational expense of these methods is high and this limits the size of the systems that can be analysed in reasonable time frames on modern computers. Two importance measures, which provide an index of the influence of each component on the system reliability, have also been previously developed. This is useful for the optimisation of the reliability of a phased mission, however a much larger number have been developed for non-phased missions and the different perspectives and functions they provide are advantageous. This thesis introduces new methods as well as improvements and extensions to existing methods for the analysis of both non-repairable and repairable systems with an emphasis on improved efficiency in the derivation of phase and mission reliability. New importance measures for phased missions are also presented, including interpretations of those currently available for non-phased missions. These provide a number of interpretations of component importance, allowing those most suitable in a given context to be employed and thus aiding in the optimisation of mission reliability. In addition, an extensive computer code has been produced that implements and tests the majority of the newly developed techniques and methods.EThOS - Electronic Theses Online ServiceGBUnited Kingdo