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Full-Text Articles in Mechanical Engineering

One-Dimensional Compressible Flow Analysis : Isentropic And Normal Shock, Su-Bo Wong May 1983

One-Dimensional Compressible Flow Analysis : Isentropic And Normal Shock, Su-Bo Wong

Theses

A computer program to compute and analyse one-dimensional isentropic compressible flow through variable cross-sectional area with or without a normal shock is developed. The program is written in the "FORTRAN LANGUAGE".

In this work, the area change is the predominant cause of change of flow condition. One of the advantage of this program is set on general uses for isentropic flow. In common practice, the values of the isentropic flow property ratios were tabulated or graphically presented as function of the Mach number with a specified specific heat ratio, K (normally K=1.40 was presented). With todays technology, the ...


Finite Element Analysis Of The Femoral Head, Ghandikota Ramamurthy May 1983

Finite Element Analysis Of The Femoral Head, Ghandikota Ramamurthy

Theses

Femoral component loosening and Prosthetic stem fractures have renewed interest in conservative alternatives to conventional total hip replacements. One such alternative is the concept of surface replacement. The objective in this study is a finite element analysis of a femoral surface replacement cup with Particular attention given to the interfacial stresses. An axisymmetric model with a grid of two-dimensional isoparametric elements is generated. This study utilizes an adaptive model so as to include the effect of bone remodeling in response to stress. The stiffness is considered to be linearly proportional to the stress in the femoral head and neck. Isotropic ...


Computer Simulation Of Cavity Filling During Injection Molding Process, Sumit Banerjee May 1983

Computer Simulation Of Cavity Filling During Injection Molding Process, Sumit Banerjee

Theses

A numerical technique is proposed for the simulation of cavity filling process during injection molding of glass-bead filled polypropylene. The mold cavity is of cylindrical shape. Marker And Cell (MAC) method is utilized for solving the transient flow phenomena, after a mathematical simulation of the flow model is carried out by using the relevant continuity and-momentum equations governing the system. The complexity of the equations involved, results in the simplifying assumption of incompressible and isothermal flow process. A computer program is written on the basis of finite-difference equations developed during the application of MAC method under the prevailing conditions. The ...


Modulated Hydrostatic Transformer., Parveen Kumar Gupta Jan 1983

Modulated Hydrostatic Transformer., Parveen Kumar Gupta

Theses and Dissertations

No abstract provided.


Thermoplastic Damage Of A Stretched Plate Heated By A Moving Energy Source., Metin Ozen Jan 1983

Thermoplastic Damage Of A Stretched Plate Heated By A Moving Energy Source., Metin Ozen

Theses and Dissertations

No abstract provided.


Stability Op Blade Flutter Limit Cycles In Compressor Blade Cascades Nasa Research Grant Nag 3-135 Wake-Oscillator Models., Bahhan Azizi Jan 1983

Stability Op Blade Flutter Limit Cycles In Compressor Blade Cascades Nasa Research Grant Nag 3-135 Wake-Oscillator Models., Bahhan Azizi

Theses and Dissertations

No abstract provided.


Effect Of Frequency On Fatigue Crack Growth In Betaannealed Ti-6al-4v Alloy In 3.5% Nacl Solution., Song Chiou Jan 1983

Effect Of Frequency On Fatigue Crack Growth In Betaannealed Ti-6al-4v Alloy In 3.5% Nacl Solution., Song Chiou

Theses and Dissertations

No abstract provided.


Design Of An Interactive Interface Between A Pipe Detailing Program And A Pipe Stress Analysis Program., Russell Ira Snyder Jan 1983

Design Of An Interactive Interface Between A Pipe Detailing Program And A Pipe Stress Analysis Program., Russell Ira Snyder

Theses and Dissertations

No abstract provided.


Jet Condenser Design For A Power System In Space., Marco F. Bucchi Jan 1983

Jet Condenser Design For A Power System In Space., Marco F. Bucchi

Theses and Dissertations

No abstract provided.


Measurement Of Thermal Nonequilibrium In Post-Chf Convective Film Boiling., David Gordon Evans Jan 1983

Measurement Of Thermal Nonequilibrium In Post-Chf Convective Film Boiling., David Gordon Evans

Theses and Dissertations

No abstract provided.


Time-Optimal Control Strategies For Residential Heating Systems Using State-Space Techniques , Roy R. Crawford Jan 1983

Time-Optimal Control Strategies For Residential Heating Systems Using State-Space Techniques , Roy R. Crawford

Retrospective Theses and Dissertations

Past research on the optimization of building performance has resulted in various control strategies which minimize building energy consumption while maintaining a specified level of indoor environmental quality (e.g., thermal comfort, mass air quality, lighting levels). The optimal control strategy proposed in this study uses a "performance index," which quantifies the "costs" of energy consumption and indoor environmental quality, to mathematically express the operating performance of a building;A procedure is developed for deriving a dynamic system model which relates the indoor environmental quality to the energy consumption of a building. A system model is derived, semi-empirically, from actual ...


Electrical Breakdown And Ignition Of An Electrostatic Particulate Suspension , Tae-U Yu Jan 1983

Electrical Breakdown And Ignition Of An Electrostatic Particulate Suspension , Tae-U Yu

Retrospective Theses and Dissertations

An electrostatic suspension concept was successfully utilized in generating a uniform particulate cloud between two parallel electrodes in air at atmospheric pressure in order to investigate the effect of this cloud on electrical breakdown, electrical discharge, and ignition of combustible gases. Electrical breakdown was initiated by a fast moving injected needle electrode which resulted in a minimal disturbance of the suspension;It was observed that when using a negative needle (electrode), neither the breakdown voltage nor the needle position at breakdown depended significantly on the needle velocity or the particle number density. Conversely, the positive needle (electrode) breakdown voltage and ...


A Calculation Procedure For The Partially-Parabolized Navier-Stokes Equations In Transformed Coordinates For Two-Dimensional Flow In Channels Of Variable Cross-Section, Philip Charles Eberhardt Jorgenson Jan 1983

A Calculation Procedure For The Partially-Parabolized Navier-Stokes Equations In Transformed Coordinates For Two-Dimensional Flow In Channels Of Variable Cross-Section, Philip Charles Eberhardt Jorgenson

Retrospective Theses and Dissertations

No abstract provided.


Lateral Stability Of The Driver/Vehicle System: Analytical Results , Charles Wayne Johnson Jan 1983

Lateral Stability Of The Driver/Vehicle System: Analytical Results , Charles Wayne Johnson

Retrospective Theses and Dissertations

The lateral stability of the driver/vehicle system is considered. It is first shown that, if the classical problem of the lateral stability of an automobile is considered in an absolute reference frame, the automobile is unstable. A driver responding proportionally to yaw angle and lateral displacement is added to the bicycle model of the automobile and the stability of the driver/vehicle system is considered. The Routh-Hurwitz criterion is applied to the characteristic equation of the system and the critical speed of the driver/vehicle system is obtained. It is shown that the critical speed of the driver/vehicle ...


Modeling Techniques In Metal Forming: Upsetting Of A Forged Plastic Ring , Hsien-Yung Lee Jan 1983

Modeling Techniques In Metal Forming: Upsetting Of A Forged Plastic Ring , Hsien-Yung Lee

Retrospective Theses and Dissertations

Numerical studies of a plastic ring in axial compression were made using the method of finite element. Standard rings with geometry 6:3:2 (outside diameter:inside diameter:height) were compressed to 8% and 16% deformations with sticking friction for both loaded and unloaded situations;An elastic-plastic finite element program was developed incorporating several different modeling considerations. Special attentions were paid to elastic unloading, modified von Mises yield criterion and large deformation in order to simulate a corresponding plastic model of material 'Rigid Laminac' correctly;The material 'Rigid Laminac' has a higher elastic strain than ordinary metal such as aluminum ...


Development Of The Linear Displacement Discontinuity Method , Mahmoud C. Assaad Jan 1983

Development Of The Linear Displacement Discontinuity Method , Mahmoud C. Assaad

Retrospective Theses and Dissertations

The displacement discontinuity method is reviewed as a numerical technique for computing stresses and displacements distribution over a plane area in a homogeneous, isotropic, linearly elastic material. The elementary solution for a single line crack in an infinite body is derived. The displacement function over the line segment is assumed to be linear of the form ax + b, where a and b are functions of the displacement at the extreme nodes of the line segment. The numerical technique used to overcome the indefinite values of the analytical solution at the singular node points is explained. The problem of a pressurized ...


Optical Techniques For The Measurement Of Liquid Solid-Contact In Film And Transition Boiling Regimes., Timothy Butrie Jan 1983

Optical Techniques For The Measurement Of Liquid Solid-Contact In Film And Transition Boiling Regimes., Timothy Butrie

Theses and Dissertations

No abstract provided.


Failure Prediction Based On Strain Energy Density Criterion For Crack And Notch Problems In Thermoelasticity., Robert Charles Bolton Jan 1983

Failure Prediction Based On Strain Energy Density Criterion For Crack And Notch Problems In Thermoelasticity., Robert Charles Bolton

Theses and Dissertations

No abstract provided.


Experimental Observations Of Vortex Ring Interaction With The Fluid Adjacent To A Surface., Anthony William Cerra Jan 1983

Experimental Observations Of Vortex Ring Interaction With The Fluid Adjacent To A Surface., Anthony William Cerra

Theses and Dissertations

No abstract provided.


Application Of Viscous-Inviscid Interaction To Separated Flows With Heat Transfer Including Rearward-Facing Step Flows, Edward Joseph Hall Jan 1983

Application Of Viscous-Inviscid Interaction To Separated Flows With Heat Transfer Including Rearward-Facing Step Flows, Edward Joseph Hall

Retrospective Theses and Dissertations

No abstract provided.


Edgetone Interaction., Michael Lucas Jan 1983

Edgetone Interaction., Michael Lucas

Theses and Dissertations

No abstract provided.


Crack Arrest Fracture Toughness Of A36, A588, And A514 Structural Steels., Dat V. Ngo Jan 1983

Crack Arrest Fracture Toughness Of A36, A588, And A514 Structural Steels., Dat V. Ngo

Theses and Dissertations

No abstract provided.


Stability Analysis Of Closed Surge Tanks By Phase-Plane Method, Mostafa A. Sabbah Jan 1983

Stability Analysis Of Closed Surge Tanks By Phase-Plane Method, Mostafa A. Sabbah

Civil & Environmental Engineering Theses & Dissertations

The governing equations describing water level oscillations in a closed surge tank with compressed air at the top of the tank are a set of nonlinear ordinary differential equations if the hydraulic system is analyzed as a lumped system. These oscillations are stable or unstable depending on the parameters of the plant and the type and magnitude of the disturbance.

The present available stability criterion has been developed by linearizing the governing equations and is, therefore, valid only for small disturbances.

In the research reported herein, the governing equations are normalized to reduce the number of parameters from nine to ...


Liquid Transmission Line Pulser Circuit For Laser Excitation, Carl Stultz Jan 1983

Liquid Transmission Line Pulser Circuit For Laser Excitation, Carl Stultz

Dissertations and Theses

The subject of this thesis is the study of liquid dielectric transmission lines and their potential application as an excitation source in high speed, high-repetition rate laser designs. The design problems associated with the construction of high repetition rate (khz), short wavelength lasers have been reviewed and the major shortcomings of conventional electrical driving circuits identified. The identification of these shortcomings and a review of the available literature on electrical circuits for various types of lasers suggested that liquid dielectrics and transmission lines could potentially have significant advantages over more conventional circuitry used in high repetition rate, short wavelength lasers ...