Engineering Commons^™

Report On Screw Fastened Sheet Steel Connections For Canadian Steel Industries Construction Council, Volume I, R. W. Eastman

CCFSS Library (1939 - present)

Ultimate load data is presented from more than 1600 tests on sample connections made with different thicknesses of zinc-coated sheet steel and a variety of commonly used thread forming and self-drilling fasteners. The three fundamental loading conditions examined were pull-over, pull-out and single lap shear.

Empirical relationships have been developed which allow interpolation of the data within the range of sheet steel thicknesses tested.

Type AB and type A thread forming fasteners, and a number of different self-drilling fasteners were tested, in sizes from #14 (.250 in.) to #8 (.164 in.) diameter. Flat metal washers and a variety of sealing …

Steel Roof Deck Design Manual, Steel Deck Institute

Steel Deck Institute (SDI) Specifications and Manuals (1939 - present)

No abstract provided.

Evaluation Of The Results Of Gravity And Load Tests Of C And Z Purlin Roof Systems, Teoman Peköz

CCFSS Library (1939 - present)

No abstract provided.

Energy - Minerals - Environment: How Now Brown Cow?, Bobby G. Wixson

UMR-MEC Conference on Energy / UMR-DNR Conference on Energy

Energy, technical, social, political, economic, and environmental problems are all people related problems which will continue to increase along with the world's population. With the growing demands for more energy and minerals along with the constraints of protecting the environment, new approaches must be considered to these complex problems.

Energy sources, modifications, alternatives, and new developments must be considered for the present as short term resources (next 25- 30 years) and in the future as long range research necessary to develop and implement new technology (25 years on). Major energy sources and their environmental considerations are generally classified as:

I. …

An Examination Of The Adaptive Random Search Technique, M. W. Heuckroth, J. L. Gaddy, L. D. Gaines

Chemical and Biochemical Engineering Faculty Research & Creative Works

Random search procedures have recently been successfully applied to the optimization of a variety of chemical engineering problems, including optimization of chemical processes by flow sheet simulation. These procedures represent the independent variables as random variables described by probability distributions. The adaptive random search procedure centers the distribution for each variable about the best search point found and examines this region for a better point. Thus, this technique has the ability of continuously moving the search region toward the optimum, which is particularly advantageous in following constraints. This study examines the efficiency of the adaptive random search technique as applied …

Mass Transfer In Dispersed And Continous Phases For Creeping Flow Of Fluid Spheres Through Power Law Fluids, Türker Gürkan, Robert M. Wellek

Chemical and Biochemical Engineering Faculty Research & Creative Works

The diffusion equation was numerically solved by an implicit finite-difference method for the purpose of calculating the continuous phase Sherwood number, Sh, for mass transfer from an internally circulating Newtonian droplet traveling through a non-Newtonian power-law-type continuous phase in the creeping flow regime. The Mohan stream functions were used in the calculations in order to approximate the velocity profile inside and outside the droplet. The calculated Sh is presented as a function of the Peclet number, Pe, power-law index, n, and a viscosity ratio parameter, X. Sh increases as n decreases in the pseudoplastic region. The dependence of Sh on …

Generalized Correlations For Molecular Weight And Concentration Dependence Of Zero-Shear Viscosity Of High Polymer Solutions., J. L. Zakin, R. Wu, H. Luh, Kenneth G. Mayhan

Chemical and Biochemical Engineering Faculty Research & Creative Works

Results of a study are presented which show that two correlations of viscosity-concentration data are useful representations for data over wide ranges of mol. wt and up to at least moderately high concentrations for both good and fair solvents. Low mol. wt polymer solutions (below the critical entanglement mol. wt M//c) generally have higher viscosities than predicted by the correlations. One correlation is eta //s//p/c left bracket eta right bracket versus k prime left bracket eta right bracket c, where eta //s//p is specific viscosity, c is polymer concentration, left bracket eta right bracket is intrinsic viscosity, and k prime …

Predicting Natural Frequencies Of A Hydrodynamically Lubricated Journal Bearing With Constant Oil Supply Pressure, D. C. Edwards, N. Khorzad, Charles L. Edwards

Mechanical and Aerospace Engineering Faculty Research & Creative Works

The analytical and experimental investigations reported here deal with the natural frequencies and system behavior of a full journal bearing subjected to a small sinusoidal load superimposed on a large unidirectional static load. The analysis, verified by experimentation, shows that the bearing can be regarded as two independent second-order systems acting perpendicular to each other. The variable coefficients of the equations of motion cause the bearing to behave as an underdamped system for low values of static eccentricity ratio to, and as an overdamped system for intermediate values of to. The bearing tends to be unstable above a particular to. …

Void-Strengthening In Aluminum And Its Nature, P. G. Manusmare, Hollis P. Leighly

Materials Science and Engineering Faculty Research & Creative Works

Temperature and strain rate dependence of yield strength were used to analyze the nature of aluminum strengthened by the formation of voids. Aluminum rods 99.999% pure were quenched and heat treated to form voids with an approximate density of 1013-1014 voids/cm3. Voids in selected samples were observed by electron microscopy. The yield strength of the void strengthened samples was measured at various temperatures from 77 to 593 K and at two strain rates, 3.33 x 10-2/s and 1.67 x 10-3/s. Tests at room temperature and at 77 K were made at various strain rates. The similarity of Coulomb's approach to …

The Martensite Transformation, Manfred Wuttig, Tetsuro Suzuki

Materials Science and Engineering Faculty Research & Creative Works

No abstract provided.

A Suboptimal Control Law To Improve The Transient Stability Of Power Systems, Aditya Kumar, Earl F. Richards

Materials Science and Engineering Faculty Research & Creative Works

The application of optimal control theory to damp the electromechanical oscillations associated with the transient conditions in power systems has been given little attention. A suboptimal control law which minimizes the sum of the performance indices of the two linear systems given by a piecewise linear model of a power system improves the transient stability better than the usual "optimal" control law obtained from a linearized model. Further, the suboptimal control law presented in this paper assures stability of the system for all disturbances resulting in rotor oscillations of magnitudes less than a preselected limit. Copyright © 1976 by The …

A Closed-Form Solution For The Radiosity At The Edge Of A Rectangular Cavity, Alfred L. Crosbie

Mechanical and Aerospace Engineering Faculty Research & Creative Works

No abstract provided.

Two-Dimensional Markov Representations Of Sampled Images, J. A. Stuller

Electrical and Computer Engineering Faculty Research & Creative Works

This Paper Shows that, under Certain Weak Restrictions, a Two-Dimensional Discrete Markov Process Can Be Represented Either "Causally" by a One-Sided Difference Equation, or "Non causally" by a Multiple-Sided Difference Equation. the Former Representation is Pertinent to the Analysis of Image Coders and Processors that Operate Sequentially on Scanned Image Data. the Latter Representation is Applicable to the Analysis of Block Coders and Processors. the General Relation between the Two Representations is Given and the Specialized Forms Resulting under Separable Scene Covariance Studied. Copyright © 1976 by the Institute of Electrical and Electronics Engineers. Inc.

Horizon Profile Checkpoints For Low-Altitude Aircraft, Gordon E. Carlson, George L. Bair, Charles M. Benoit

Electrical and Computer Engineering Faculty Research & Creative Works

A technique for utilizing on-board sensed horizon profiles and computer stored reference horizon profiles to provide navigation check points for low-altitude aircraft is described. The technique has been analyzed using digitized terrain data and computer simulations to select the best method of horizon profile comparison, to determine horizon data density requirements, and to provide performance comparisons, system error limitations, and tradeoffs. Results of these analyses are shown to support feasibility conclusions and system parameter tradeoffs. Copyright © 1976 by The Institute of Electrical and Electronics Engineers, Inc.

Detection In Image Dependent Noise, David R. Cunningham, Robert D. Laramore, Eamon Barrett

Electrical and Computer Engineering Faculty Research & Creative Works

The detection of two-dimensional optical signals which have been corrupted by noise is considered. Discussion is limited to the detection of a known object in a known location. The problem is approached from the classical statistical technique of hypothesis testing. Initially the solution is formulated in very general terms. The decision rule is derived for a signal distorted by noise of an unspecified type which may include signal dependent noise. Once the decision rule is obtained, the probabilities of false alarm and detection are evaluated from a priori knowledge of the noise and imaging system. The general results are applied …

Kalman Filter Equalization For Qpsk Communications, T. S. Lee, David R. Cunningham

Electrical and Computer Engineering Faculty Research & Creative Works

The discrete complex Kalman filter is considered as an equalizer for quadrature phase-shift keyed (QPSK) systems in the presence of additive noise and InterSymbol interference (ISI). When the channel is unknown, an adaptive Kalman equalizer is used in which the channel complex tap gains are estimated by decision feedback. Copyright © 1976 by The Institute of Electrical and Electronics Engineers, Inc.

Influence Of Turbidity On The Stratification Development Of A Deep Water Reservoir., David Allen Prouty

Masters Theses

"The influence of turbidity on the diurnal temperature distribution and thermocline development in a deep water impoundment which is exposed to heating and cooling loads by convection, evaporation, and radiation is examined analytically. The diurnal behavior of the solar load, directional and spectral, is used with an isotropic multiple scattering model to simulate the attenuation of solar flux by turbid water. The diurnal behavior of the ambient temperature, humidity and wind speed were mathematically modeled to simulate the local (Phelps Co.) spring time of the year. The combined conduction and radiation energy transfer through the water was treated as a …

Non-Cash Incentives And Worker Motivation, Daniel Franklin Cole

Masters Theses

"A problem of growing concern in the United States deals with the poor results of the nation's businesses in terms of productivity. The U.S. is now suffering the worst decline in productivity in a generation. While part of this decline can be attributed to economic conditions, data indicates that the labor force could be more productive if it wanted to do so. A study has shown that 52% of all workers feel they aren't producing at full capacity. Alienation of the American worker is identified as one of the most important contributors to this problem.

Because it is often difficult …

Mass Transfer To Drops Moving Through Power Law Fluids In The Intermediate Reynolds Number Region, Robert M. Wellek, Türker Gürkan

Chemical and Biochemical Engineering Faculty Research & Creative Works

The mass transfer rate to fluid spheres is calculated for power law and Newtonian fluids by using the intermediate Reynolds number stream functions of Nakano and Tien (1970) and Yamaguchi et al. (1974), respectively. The Sh increases with increases in Re and Pe and decreases in n. Better results are obtained with Nakano and Tien's functions when Re > 10 and with Yamaguchi's functions when Re < 10. Copyright © 1976 American Institute of Chemical Engineers

Process Optimization By Flow Sheet Simulation, L. D. Gaines, J. L. Gaddy

Chemical and Biochemical Engineering Faculty Research & Creative Works

Optimization of large or complex chemical processes often requires simplifying the system to reduce the mathematics to a form manageable by available algorithms or to reduce the time required to perform the computations. In many cases, such simplification alters the solution of the problem. Flow sheet simulation programs are ideally suited to the study of chemical processes, although the computational time is generally considered excessive for detailed optimization of complex systems by the usual procedures. This paper discusses the modifications needed to apply flow sheet simulation programs to the optimization of chemical processes. The advantages and disadvantages of the use …

Transition Boiling Of Normal Pentane From A Horizontal Flat Gold Surface At One Atmosphere Pressure, R. M. Canon, Efton Park

Chemical and Biochemical Engineering Faculty Research & Creative Works

No abstract provided.

Development Of Helicopter Flight Path Models, Alfred Fermelia, Donald A. Gyorog, V. J. Flanigan

Mechanical and Aerospace Engineering Faculty Research & Creative Works

The objective of this paper is to present general techniques for simulating helicopter flight trajectory response. During flight the pilot manipulates the controls either to trim the helicopter for steady flight by balancing the external forces and moments or to produce a desired maneuver by controlling the unbalance of these forces and moments. Discussions of the physical phenomena involved with the aerodynamics of the rotors and fuselage are given in [1] through [3]. The simulated control function will be composed forward-aft cyclic, lateral cyclic, pedal, and collective. This control will be represented by the vector

Comments On “A Counterexample To Harmonic Linearization”, D. Ronald Fannin

Electrical and Computer Engineering Faculty Research & Creative Works

No abstract provided.

Computer Analysis Of 3-Phase Induction Motor Operation On Rural Open-Delta Distribution Systems, Stephen C. Seematter, Earl F. Richards

Electrical and Computer Engineering Faculty Research & Creative Works

Open-delta/open-delta and open-wye/open-delta transformer banks are often used as an economic means of supplying simultaneous single-phase and 3-phase loads in rural areas. If the 3-phase load is an induction motor, the inherent voltage unbalance causes increased losses and uneven heating that may lead to motor failure. Often these motors are submersible or deep well pump motors located in remote unattended areas or air conditioning motors which may not have sufficient over-design to handle the voltage unbalance. The theory analyzing the open-delta distribution system has existed for many years, however, because of the tedious and almost infinite differences in distribution topology, …

The Effect Of Receiver Pressure On The Observed Flow Pattern In The Hydrostatic Extrusion Of Bimetal Rods, Ronald A. Kohser

Materials Science and Engineering Faculty Research & Creative Works

No abstract provided.

On The Effects Of Antimony And Glue On Zinc Electrocrystallization Behaviour, D. J. Robinson, Thomas J. O'Keefe

Materials Science and Engineering Faculty Research & Creative Works

An investigation has been made to determine the effects that additions of glue and antimony have on the electrowinning of zinc from acid sulphate solutions. In particular, the zinc crystal growth and cathode current efficiencies were studied in an attempt to establish a correlation between morphology and the nature of the additives. Operating conditions of 55 A ft-2* and 35°C were used for most of the experiments with electrolyte concentrations of approximately 55 gl-1 zinc and 150 gl-1 H2SO4. Additional runs were made at 40,75 and 100 Aft-2 at 30,40 and 50°C in order to verify certain trends. Primarily by …

Interpretation Of Some Of The Basic Features Of Field-Ion Image Projections From A Hemispherical To A Planar Surface Using Moire Patterns, P. D. Ownby, Robert M. Doerr, Walter Bollmann

Materials Science and Engineering Faculty Research & Creative Works

No abstract provided.

Deformation Produced By A Simple Tensile Load In An Isotropic Elastic Body, R. C. Batra

Mechanical and Aerospace Engineering Faculty Research & Creative Works

It is shown that a simple tensile load produces a simple extension provided the empirical inequalities (Truesdell and Noll [1], eqn. 51.27) hold. © 1976 Noordhoff International Publishing.

Bit Penetration Into Rock-A Finite Element Study, J. K. Wang, T. F. Lehnhoff

Mechanical and Aerospace Engineering Faculty Research & Creative Works

The sequence of rock failure mechanisms and quantitative information on stress, displacement and material failure in the process of bit penetration have been obtained through computer simulation. A finite element approach has been developed to simulate bit penetration from bit-rock interaction to chip formation. A mathematical rock failure model, based on available rock failure experiments, has been proposed to represent post-failure rock behavior and applied in the penetration simulations. The finite element code was developed for two-dimensional plane strain problems to consider non-linear material properties, geometric non-linearity, and fracture propagation. An anistropic element as well as variable stiffness and stress …

Numerical Simulation Of A Widely Used Cloud Nucleus Counter., Darryl J. Alofs, J. C. Carstens

Mechanical and Aerospace Engineering Faculty Research & Creative Works

The Performance of the Conventional Horizontal Plate Thermal Diffusion Chamber as a Cloud Nucleus Counter Was Studied. Numerical Calculations Were Performed in Order to Follow the Simultaneous Drop Growth and Sedimentation in the Spatially and Temporally Nonuniform Supersaturation Field. the Effect of Nuclei Distribution and Smallest Detectable Drop Size Were Investigated. the Results Indicate Order of Magnitude Uncertainty in the Count at 0. 1% Supersaturation, and a Factor of 2 Uncertainty at 1. 0% Supersaturation.