Thesis (M.S.)--University of Wisconsin, 1967. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M.S.)--University of Wisconsin--Madison, 1963. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 156-171).

Thesis--University of Wisconsin--Madison. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 252-258).

Thesis (Ph. D.)--University of Wisconsin--Madison, 1975. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 558-573).

Thesis (M.U.D.)--University of Hong Kong, 1990. / Includes bibliographical references (leaves 125-128) Also available in print.

Thesis (J.C.L.)--Catholic University of America, 1987. / Includes bibliographical references (leaves 56-61).

Thesis (Ph. D.)--University of Washington, 1985. / Vita. Bibliography: leaves [123]-128.

Les stratégies de maintenance et leurs évaluations demeurent une préoccupationparticulièrement forte au sein des entreprises aujourd’hui. Les enjeux socio-économiquesdépendant de la compétitivité de chacune d’entre elles sont de plus en plus étroitement liés àl’activité et à la qualité des interventions de maintenance. Une suite d’évènements particulierspeut, éventuellement, informer l’expert d’une panne prochaine. Notre étude tente d’appréhender« cette signature » à l’aide d’un modèle de Markov caché. Nous proposons à l’expert deuxstratégies sur l’estimation du niveau de dégradation du système maintenu. La première stratégieconsiste à utiliser des lois de dégradation non paramétrique et semi-paramétrique. La deuxièmestratégie consiste à utiliser une approche markovienne. Toutes les propositions sont illustrées surdeux études de cas correspondant à deux situations réelles de travail (système continu dans lafabrication de pain et produits moulés en alliages d'aluminium dans le cadre d’un processusdiscontinu). / Today, maintenance strategies and their analyses remain a worrying problem forcompanies. Socio economic stakes depending on competitiveness of each strategy are even morelinked to activity and quality of maintenance interventions. A series of specific events caneventually warn the expert of an imminent breakdown. Our study aims at understanding this“signature” thanks to an hidden Markov model. On that purpose, two strategies on damage levelestimation of maintained system are proposed to expert. The first one consists in using of nonparametric and semi parametric degradation laws. The second one consists in using of anmarkovian approach. All proposals are illustrated on two case studies corresponding to two realindustrial situations (continuous system for food processing and moulded products in aluminumalloys in an discontinuous process).

An efficient three-dimensional structured solver for the Euler and Navier-Stokes equations is developed based on a finite volume upwind algorithm using Roe fluxes. Multigrid and optimal smoothing multi-stage time stepping accelerate convergence. The accuracy of the new solver is demonstrated for inviscid flows in the range 0.675 :5M :5 25. A comparative grid convergence study for transonic turbulent flow about a wing is conducted with the present solver and a scalar dissipation central difference industrial design solver. The upwind solver demonstrates faster grid convergence than the central scheme, producing more consistent estimates of lift, drag and boundary layer parameters. In transonic viscous computations, the upwind scheme with convergence acceleration is over 20 times more efficient than without it. The ability of the upwind solver to compute viscous flows of comparable accuracy to scalar dissipation central schemes on grids of one-quarter the density make it a more accurate, cost effective alternative. In addition, an original convergencea cceleration method termed shock acceleration is proposed. The method is designed to reduce the errors caused by the shock wave singularity M -+ 1, based on a localized treatment of discontinuities. Acceleration models are formulated for an inhomogeneous PDE in one variable. Results for the Roe and Engquist-Osher schemes demonstrate an order of magnitude improvement in the rate of convergence. One of the acceleration models is extended to the quasi one-dimensiona Euler equations for duct flow. Results for this case d monstrate a marked increase in convergence with negligible loss in accuracy when the acceleration procedure is applied after the shock has settled in its final cell. Typically, the method saves up to 60% in computational expense. Significantly, the performance gain is entirely at the expense of the error modes associated with discrete shock structure. In view of the success achieved, further development of the method is proposed.

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