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Filtering by: Has journal Climate of the Past Remove constraint Has journal: Climate of the Past Decade 1980-1989 Remove constraint Decade: 1980-1989 Degree Field Mechanical Engineering Remove constraint Degree Field: Mechanical Engineering

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  • Application of linear quadratic control in reduction of aerodynamic forces on aircraft

    Creator:
    Wei, Shou Yuan
    Abstract:
    A problem found in high speed transport aircraft is excessive tail loading when flying at cruise speeds through turbulence. Attempts to reduce these areodynamic forces on the tail may result in unstable aircraft motions. Using a linear quadratic regulator in conjunction with a Kalman filter, the feasibility of designing an...
    Resource Type:
    Dissertation
    Full Text:
    all environmental factors influencing the past, present, and future. 4. Determination of the optimal

  • Evaluation of thermal energy storage requirements for a geothermal based district heating system

    Creator:
    Lawrence, Thomas M.
    Abstract:
    The thermal energy storage requirements for a district heating system utilizing geothermal energy is evaluated with respect to the system design heating load and local climatic conditions. The local climate pattern is represented by a series of events which characterize the nature and sequence of the cold spells that can...
    Resource Type:
    Masters Thesis
    Full Text:
    . The local climate pattern is represented by a series of events which characterize the nature and

  • The effect of alpha phase morphology on the impact energy of commercial purity titanium

    Creator:
    York, James Michael
    Abstract:
    Samples of commercial purity titanium were heat treated above the beta transformation temperature and within the two phase alpha-beta phase field, followed by cooling at varying rates. Testing of the samples in tension and by instrumented impact indicated that some strengthening could be imparted by these heat treatments, although at...
    Resource Type:
    Masters Thesis
    Full Text:
    The Effect of Alpha Phase Morphology on the Impact Energy

  • Calculation of the pressure distribution on a pitching airfoil with application to the Darrieus Rotor

    Creator:
    Ghodoosian, Nader
    Abstract:
    An analytical model leading to the pressure distribution on the cross section of a Darrieus Rotor Blade (airfoil) was constructed. The model was based on the inviscid flow theory and the contribution of the nonsteady wake vortices was neglected. The analytical model was translated into a computer code in order...
    Resource Type:
    Masters Thesis
    Full Text:
    Calculation of the pressure distribution on a pitching

  • Design and optimization of a heating-only heat pump for Western Pacific Northwest applications

    Creator:
    Elger, Donald Francis
    Abstract:
    The use of the conventional air-source heat pump for residential space conditioning has increased dramatically over the past decade. Historically these units have been designed as air conditioners which could also be used to provide heating. However, for the climatic region of the Western Pacific Northwest (the geographic region west...
    Resource Type:
    Masters Thesis
    Full Text:
    objectives of optimizing the heating performance of the heat pump under typical U.S. Northern climate

  • An empirical study on the process of mechanical design

    Creator:
    Stauffer, Larry A.
    Abstract:
    An information processing model of the problem-solving performance of mechanical designers is presented for four design tasks: conceptual assembly design, layout component design, detail component design, and catalog selection. These tasks are organized into six kinds of segments called episodes, which describe the goal structure of the designer while performing...
    Resource Type:
    Dissertation
    Full Text:
    . PAST EMPIRICAL RESEARCH IN MECHANICAL DESIGN While there is a significant body of research in the

  • Evaluation of the Boleyn solar home, Portland, Oregon

    Creator:
    Ehm, Hans
    Abstract:
    The Boleyn home located in Portland Oregon (latitude 45°) is evaluated based on monitoring data taken from 1977 to 1982. The Boleyn home is a two-story (plus basement) frame home. It takes benefit of passive solar gains and is equipped with an active solar system. The active solar system consists...
    Resource Type:
    Masters Thesis
    Full Text:
    Evaluation of the Boleyn solar home, Portland, Oregon

  • An aeroelastic analysis of the Darrieus wind turbine

    Creator:
    Meyer, Edward Earnest
    Abstract:
    The stability of small oscillations of the troposkeinshaped blade used on Darrieus wind turbines is investigated. The blade is assumed to be attached to a perfectly rigid rotor shaft and spinning in still air. Linear equations of motion are derived which include the effects of in-plane, out-of-plane, and torsional stiffness,...
    Resource Type:
    Dissertation
    Full Text:
    An Aeroelastic Analysis of the Darrieus Wind Turbine AN

  • Effects of selected atmospheric variables on the power output of a DOE Mod-2 wind turbine

    Creator:
    Germain, Alan Clifford.
    Abstract:
    The effects of selected atmospheric variables on the power output of a DOE Mod-2 horizontal-axis wind turbine are studied. Particular attention is focused on unsteady, nonuniform flow conditions within the rotor disc as represented by vertical profiles measured at adjacent meteorological towers. Primary variables are wind speed, wind direction and...
    Resource Type:
    Masters Thesis
    Full Text:
    mountain range, the climate of the area is a dry, continental type. Vegetation is sparse; mostly grasses

  • Use of the exergy concept for design improvement of heat exchangers and heat exchanger networks

    Creator:
    Ranasinghe, Jatila
    Abstract:
    The second law of thermodynamics, through the exergy concept, allows us to quantify and rationally cost the consumption of exergy (irreversibility) used to drive the heat exchange process and the effluent losses of exergy in a heat exchanger For systems with a network of heat exchangers, the exergy concept recognizes...
    Resource Type:
    Dissertation
    Full Text:
    Use of the exergy concept for design improvement of heat