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1987

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Articles 1 - 30 of 219

Full-Text Articles in Mechanical Engineering

Theoretical Thermodynamic Properties Of Low Temperature Fluids, Jamal Dec 1987

Theoretical Thermodynamic Properties Of Low Temperature Fluids, Jamal

Master's Theses

The thermodynamic functions for low temperature fluids are computed using parametric integral equations and perturbation theory. Parametric integral equation N is applied to a low temperature Lennard-Jones gas. It is found that there is no significant improvement over the better known parametric integral equation C. The two parameter integral equation T is applied to a low temperature square-well potential and is found to be unsatisfactory at reduced temperatures of T*= 1.4 and 1.6, but quite accurate at T* = 2.2. The equation T results for T* = 2.2 are used as the reference system in perturbation theory computations ...


Definition Of An Asymmetric Domain For Intercrystalline Misorientation In Cubic Materials In The Space Of Euler Angles, Brent L. Adams, Junwu Zhao Dec 1987

Definition Of An Asymmetric Domain For Intercrystalline Misorientation In Cubic Materials In The Space Of Euler Angles, Brent L. Adams, Junwu Zhao

Faculty Publications

The authors wish to acknowledge the support of the United States Department of Energy, Office of Basic Energy Sciences, under grant No. DE-FG02-85ER45203. Critical review by Professor Dorian Hatch of the Physics Department at Brigham Young University is gratefully acknowledged. A new asymmetric domain for intercrystalline misorientation is defined in the space of Euler angles for materials exhibiting cubic (Oh point-group) lattice symmetry. The invariant measure for this new domain is nearly constant; this is in significant contrast to the previous domain defined by MacKenzie [Biornetrika (1958), 45, 229-240]. Distribution functions in the misorientation can now be represented with greater ...


An Update To The Mitre/Wpi Space Shuttle Prgoram: Gascan G-408, Fred J. Looft, William W. Durgin Oct 1987

An Update To The Mitre/Wpi Space Shuttle Prgoram: Gascan G-408, Fred J. Looft, William W. Durgin

Office of the Provost Scholarship

The objective of the MITRE/WPI Space Shuttle Program was to develop a set of scientific meaningful experiments that could be flown in a Get Away Special Canister. currently, the first GASCAN is finished (G-408) and ready to be launched. The program has been so successful that the design and development of a second set of experiments has been started (G-533). This paper will describe and summarize both of these programs.


Dimensions Fall 1987, Iowa State University Department Of Mechanical Engineering Oct 1987

Dimensions Fall 1987, Iowa State University Department Of Mechanical Engineering

Dimensions

No abstract provided.


A Study Of Flow Separation In Transonic Flow Using Inviscid And Viscous Cfd Schemes, James Andrew Rhodes Oct 1987

A Study Of Flow Separation In Transonic Flow Using Inviscid And Viscous Cfd Schemes, James Andrew Rhodes

Mechanical & Aerospace Engineering Theses & Dissertations

A comparison of flow separation in transonic flows is made using various computational schemes which solve the Euler and the Navier-Stokes equations of fluid mechanics. The flows examined are computed using several simple two-dimensional configurations including a backward facing step and a bump in a channel. Comparison of the results obtained using shock fitting and flux vector splitting methods are presented and the results obtained using the Euler codes are compared to results on the same configurations using a code which solves the Navier-Stokes equations.


The Effects Of A Mandatory Early Shutdown Of Maine Yankee, Maine State Planning Office Sep 1987

The Effects Of A Mandatory Early Shutdown Of Maine Yankee, Maine State Planning Office

Maine Collection

The Effects of a Mandatory Early Shutdown of Maine Yankee

Maine State Planning Office - Richard Silkman, Director (September 1987).

Contents: Introduction / Legal Issues / Economic Issues / Health and Environmental Issues / Conclusions / Appendices


A Turbulence Model For The Heat Transfer Near Stagnation Point Of A Circular Cylinder, Mounir B. Ibrahim Sep 1987

A Turbulence Model For The Heat Transfer Near Stagnation Point Of A Circular Cylinder, Mounir B. Ibrahim

Mechanical Engineering Faculty Publications

A one-equation low-Reynolds number turbulence model has been applied successfully to the flow and heat transfer over a circular cylinder in turbulent cross flow. The turbulence length-scale was found to be equal 3.7y up to a distance 0.05δ and then constant equal to 0.185δ up to the edge of the boundary layer (wherey is the distance from the surface and δ is the boundary layer thickness).

The model predictions for heat transfer coefficient, skin friction factor, velocity and kinetic energy profiles were in good agreement with the data. The model was applied for Re ≤250 ...


Topology And Grid Adaption For High-Speed Flow Computations, Jamshid Samareh Abolhassani Jul 1987

Topology And Grid Adaption For High-Speed Flow Computations, Jamshid Samareh Abolhassani

Mechanical & Aerospace Engineering Theses & Dissertations

This study investigates the effects of grid topology and grid adaption on numerical solutions of the Navier-Stokes equations. In the first part of this study, a general procedure is presented for computation of high-speed flow over complex three-dimensional configurations. This includes the grid generation and solution algorithm for Navier-Stokes equations in a general three-dimensional curvilinear coordinate system. The flow field is simulated on the surface of a Butler wing in a uniform stream. Results are presented for Mach number 3.5 and a Reynolds number of 2,000,000. The O-type and H-type grids have been used for this study ...


Stress Analysis Of A Stepped Shaft With A Keyway, Irfan Hussain Sabir May 1987

Stress Analysis Of A Stepped Shaft With A Keyway, Irfan Hussain Sabir

Theses

A stress concentration case which is encountered in practice more than any other is the shoulder fillet. Shafts, axles, spindles, rotors etc., usually involve, in each case, a number of diameters connected by shoulders with fillet radii and very often it is necessary for a keyway to be near a shoulder. The objective in this study is to analyse the stresses in a shouldered shaft with a keyway subjected to an axial tensile load and to study the dependence of the keyway-end stresses on the distance between the shoulder fillet and the keyway end. This is done by performing a ...


The Effects Of Nonlinear Damping On The Large Deflection Response Of Structures Subjected To Random Excitation, Chunchu Bhavani Prasad Apr 1987

The Effects Of Nonlinear Damping On The Large Deflection Response Of Structures Subjected To Random Excitation, Chunchu Bhavani Prasad

Mechanical & Aerospace Engineering Theses & Dissertations

Effects of both nonlinear damping and large deflection stiffness are included in the theoretical analysis in an attempt to explain the experimental phenomena of aircraft panels excited at high sound pressure levels; that is the broadening of the strain response peak and the increase in modal frequency. Beams and symmetrically laminated plates subjected to acoustic excitation are considered in the analyses. The excitations are ergodic and Gaussian with zero mean. A polynomial containing both linear and nonlinear damping terms is considered as a damping model. Galerkin's method is used to derive modal equations. Direct equivalent linearization is used to ...


Experimental Study Of Shock Wave Interference Heating On A Cylindrical Leading Edge, Allan R. Wieting Apr 1987

Experimental Study Of Shock Wave Interference Heating On A Cylindrical Leading Edge, Allan R. Wieting

Mechanical & Aerospace Engineering Theses & Dissertations

An experimental study of shock wave interference heating on a cylindrical leading edge representative of the cowl of a rectangular hypersonic engine inlet at Mach numbers of 6.3, 6.5, and 8.0 is presented. Stream Reynolds numbers ranged from 0.5 x 106 to 4.9 x 106 per foot and stream total temperature ranged from 2100 °R to 3400 °R. The model consisted of a 3-inch-diameter cylinder and a shock generation wedge articulated to angles of 10, 12.5, and 15 degrees. The primary goal of this study was to obtain a fundamental understanding of ...


Finite Element Methodology For Nonlinear Free And Harmonic Forced Vibrations Of Beam And Plate Structures, Kamolphan Decha-Umphai Apr 1987

Finite Element Methodology For Nonlinear Free And Harmonic Forced Vibrations Of Beam And Plate Structures, Kamolphan Decha-Umphai

Mechanical & Aerospace Engineering Theses & Dissertations

The literature and experiments have shown that nonlinear vibrations produce significant effects in structural analysis, especially the frequency-amplitude-force relation and the analysis of strain. An analysis was developed to predict both the frequency-amplitude-force relation and strains of beam and plate structures. Two finite element methods were developed, namely, the iterative single-mode method (method I) and the multiple-mode method (method II). The harmonic force matrix was developed to analyze nonlinear forced vibrations. Nonlinear free vibration was a special case of the general forced vibration by setting the harmonic force matrix equal to zero. The harmonic force matrix represents the external applied ...


A Numerical Study Of Three-Dimensional Vortex Breakdown, Robert Edward Spall Apr 1987

A Numerical Study Of Three-Dimensional Vortex Breakdown, Robert Edward Spall

Mechanical & Aerospace Engineering Theses & Dissertations

A numerical simulation of vortex breakdown using the time-dependent Navier-Stokes equations was performed. Unlike previous studies, the numerical algorithm, formulated in terms of the velocity and vorticity, was not restricted to axisymmetric flows. Prototype vortices were parameterized in terms of their Reynolds number and Rossby number. Two cases were studied extensively. In one case, a vortex was imbedded in a uniform free stream. In the other case, the axial velocity of the free stream was decelerated in the streamwise direction. For both cases breakdown occurred when the Rossby number was below a critical value. Vortex lines, particle traces and velocity ...


Sub-Optimal Algorithms For Force Distribution In Multifingered Grippers, Vijay Kumar, Kenneth J. Waldron Mar 1987

Sub-Optimal Algorithms For Force Distribution In Multifingered Grippers, Vijay Kumar, Kenneth J. Waldron

Departmental Papers (MEAM)

The work described in this paper addresses the problem of determination of the appropriate distribution of forces between the fingers of a multifingered gripper grasping an object. The system is statically indeterminate and an optimal solution for this problem is desired for force control. A fast and efficient sub-optimal method for computing the grasping forces is presented. This method is based on the superposition of finger-interaction forces on equilibrating forces. An interaction force is defined as the component of the vector difference of the finger contact forces at any two fingers along the line joining the two contact points. They ...


The Use Of Ultrasound Imaging In The In-Vivo Determination Of Normal Human Arterial Compliance, Lauren I. Stratouly, Paul A. Cardullo, Frederick A. Anderson Jr., William W. Durgin, H. Brownell Wheeler Mar 1987

The Use Of Ultrasound Imaging In The In-Vivo Determination Of Normal Human Arterial Compliance, Lauren I. Stratouly, Paul A. Cardullo, Frederick A. Anderson Jr., William W. Durgin, H. Brownell Wheeler

Office of the Provost Scholarship

Elastic properties of major arteries were measured in vivo in ten normal volunteers, age 26 to 44 years (mean = 32 years). A B-mode ultrasound imager was used to noninvasively measure mean diameter and pulsatile diameter change at five locations along the main arteries in the abdomen and the lower extremities. Together with pulsatile pressure (measured by the auscultatory method), strain (ε), compliance (C) and the pressure-strain elastic modulus (Ep l/C) were calculated. Ep increased significantly along the arterial tree; mean values (x105 N/m-2 ) were: 0.99 aorta, 1.21 common iliac artery (CIA), 1.43 common ...


Tone Generation By Flow Past Deep Wall Cavities, D. D. Erickson, William W. Durgin Jan 1987

Tone Generation By Flow Past Deep Wall Cavities, D. D. Erickson, William W. Durgin

Office of the Provost Scholarship

Flow past deep wall cavities exhibits strong interaction with the standing wave system in the cavity. The shear layer separating the exterior flow from the cavity flow supports instabilities which excite the normal cavity modes. In turn, the cavity wave system reinforces the instabilities. Experimental studies have shown that two distinct instability modes are encountered as the external velocity is increased. The pressure coefficient versus Strouha1 number behavior reveals two maxima which correspond to different instability modes of the shear layer. Flow visualization studies have shown that these modes correspond to distinct shear 1ayer vortex structures. At high velocities, single ...


Thermomechanical Design Criteria For Zr02-Y203 Coated Surfaces, J. Padovan, Benjamin T.F. Chung, Glen E. Mcdonald, Robert C. Hendricks Jan 1987

Thermomechanical Design Criteria For Zr02-Y203 Coated Surfaces, J. Padovan, Benjamin T.F. Chung, Glen E. Mcdonald, Robert C. Hendricks

Mechanical Engineering Faculty Research

Thermocycling of ceramic-coated turbomachine components produces high thermomechanical stresses that are mitigated by plasticity and creep but aggravated by oxidation, with residual stresses exacerbated by all three. These residual stresses, coupled with the thermocyclic loading, lead to high compressive stresses that cause the coating to spall. In the paper a ceramic-coated gas path seal is modeled with consideration given to creep, plasticity, and oxidation. The resulting stresses and possible failure modes are discussed.


Development Of Software For Localized 3d Shading /, Scott E. Bohman Jan 1987

Development Of Software For Localized 3d Shading /, Scott E. Bohman

Theses and Dissertations

No abstract provided.


A Heuristic Algorithm To Assign Orders Into Order Picking Lots In A Semi-Automated Warehouse /, Justin Khoe Jan 1987

A Heuristic Algorithm To Assign Orders Into Order Picking Lots In A Semi-Automated Warehouse /, Justin Khoe

Theses and Dissertations

No abstract provided.


Functional Specification Definition For Manufacturing Resource Planning Software /, Manish Shah Jan 1987

Functional Specification Definition For Manufacturing Resource Planning Software /, Manish Shah

Theses and Dissertations

No abstract provided.


A Study Of Modernization/Integration Of The Manufacturing Operation In A Small, Food Company /, Faith Dauberman Clark Jan 1987

A Study Of Modernization/Integration Of The Manufacturing Operation In A Small, Food Company /, Faith Dauberman Clark

Theses and Dissertations

No abstract provided.


Automated Acoustic Intensity Measurements And The Effect Of Gear Tooth Profile On Noise, William J. Atherton, Adam Pintz, David G. Lewicki Jan 1987

Automated Acoustic Intensity Measurements And The Effect Of Gear Tooth Profile On Noise, William J. Atherton, Adam Pintz, David G. Lewicki

Mechanical Engineering Faculty Publications

Acoustic intensity measurements were made at NASA Lewis Research Center on a spur gear test apparatus. The measurements were obtained with the Robotic Acoustic Intensity Measurement System developed by Cleveland State University. This system provided dense spatial positioning, and was calibrated against a high quality acoustic intensity system. The measured gear noise compared gearsets having two different tooth profiles. The tests evaluated the sound field of the different gears for two speeds and three loads. The experimental results showed that gear tooth profile had a major effect on measured noise. Load and speed were found to have an effect on ...


A Relational Database In Support Of A Cim System /, Ronald Habakus Jan 1987

A Relational Database In Support Of A Cim System /, Ronald Habakus

Theses and Dissertations

No abstract provided.


A Feasibility Study Of The Development Of An Ibm Pc-Based Programmable Controller Ladder Logic Programming System /, Steven M. Howard Jan 1987

A Feasibility Study Of The Development Of An Ibm Pc-Based Programmable Controller Ladder Logic Programming System /, Steven M. Howard

Theses and Dissertations

No abstract provided.


Quantity Analysis, Forecast Model Application And Slotting Policies Design For The Itematic System Design /, Fu-Ann Liou Jan 1987

Quantity Analysis, Forecast Model Application And Slotting Policies Design For The Itematic System Design /, Fu-Ann Liou

Theses and Dissertations

No abstract provided.


The Control Of Search Techniques And Search Strategies Using Petri Nets In The National Bureau Of Standard's Real-Time Control System /, Barbara S. Timpte Jan 1987

The Control Of Search Techniques And Search Strategies Using Petri Nets In The National Bureau Of Standard's Real-Time Control System /, Barbara S. Timpte

Theses and Dissertations

No abstract provided.


Optimal Control Of An Axial Piston Pump Using Single-Stage And Two-Stage Electrohydraulic Servovalves , Su-Chen Jonathon Lin Jan 1987

Optimal Control Of An Axial Piston Pump Using Single-Stage And Two-Stage Electrohydraulic Servovalves , Su-Chen Jonathon Lin

Retrospective Theses and Dissertations

This work presents a study of the applicability of optimal control theory to the design of a pressure regulator for an axial piston pump and single-stage electrohydraulic valve combination; in addition, a two-stage electrohydraulic valve was used in combination with the pump. Modeling has been accomplished for these valve systems and optimal control laws have been formulated;In the single-stage servovalve model, the time response curves due to a step input in flow rate and in current input to the servovalue have been obtained for the open loop and for the optimal control system. Comparison of the results has been ...


Laser Dynamic Photoelasticity And Digital Image Analysis For Nondestructive Evaluation Of Surface And Near Surface Flaws Through Ultrasonic Spectroscopy , Babak Raj Jan 1987

Laser Dynamic Photoelasticity And Digital Image Analysis For Nondestructive Evaluation Of Surface And Near Surface Flaws Through Ultrasonic Spectroscopy , Babak Raj

Retrospective Theses and Dissertations

The interaction of Rayleigh surface waves with artificial surface-breaking and near surface flaws in a half-space have been investigated. The work reported in this research substantiates the validity of ultrasonic spectroscopy as an effective tool in nondestructive evaluation of the depth of such flaws;Dynamic photoelasticity was used to obtain full-field visualization of ultrasonic waves propagating in birefringent materials and their interaction with flaws of interest. PSM-1, which is a tough polymer of very low stress fringe value, was chosen as the birefringent material for this research. Sufficient short exposure times were achieved with a high-power pulsed YAG laser which ...


Prediction Of Ionic Structure In Hydrocarbon Flames , Ahmet Nedim Eraslan Jan 1987

Prediction Of Ionic Structure In Hydrocarbon Flames , Ahmet Nedim Eraslan

Retrospective Theses and Dissertations

The objective of this research is to model the appearance and behavior of combustion-generated ions in hydrocarbon flames. An understanding of ionic phenomena is important to the development of advanced combustion technology including electrical control of flame structure and suppression of soot formation. Computer models have been developed to evaluate the formation and behavior of ions in acetylene flames;The results of computations are compared to experimental data of other researchers. Several important qualitative features have been successfully modeled. Peak ion concentrations of 10('9) to 10('11) cm('-3) are consistent with experimental measurements. The ratio of large ions ...


A Feasibility Study Of The Utilization Of Residual Engine Heat For The Operation Of An Automotive, Absorption Type, Air Conditioner , Daniel Dow Jackson Jan 1987

A Feasibility Study Of The Utilization Of Residual Engine Heat For The Operation Of An Automotive, Absorption Type, Air Conditioner , Daniel Dow Jackson

Retrospective Theses and Dissertations

The problem of this study was to build and test an absorption type air conditioning system for automotive use that would utilize residual engine heat. The engine was used as the system's generator and the radiator was used as the system's absorber. The intent of the testing was to determine harmful affects the system may produce and how effective the system was in cooling. Fuel consumption was measured to determine a possible difference, and pressure was monitored to control exceeding limits;A review of literature was given in providing information concerning the history, state-of-the-art, and future aspects of ...