Engineering Commons^™

Test 1577: Steiger Couger Cr 1225 Diesel 20-Speed, Nebraska Tractor Test Lab

Nebraska Tractor Tests

EXPLANATION OF THE TEST PROCEDURE General Tractors are tested at the University of Nebraska according to the Agricultural Tractor Test Code approved by the American Society of Agricultural Engineers and the Society of Automotive Engineers or official Nebraska test procedure. The manufacturer selects the tractor to be tested and certifies that it is a stock model. Each tractor is equipped with the common power consuming accessories such as power steering, power lift pump, generator, etc., if available. Power consuming accessories may be disconnected only when the means for disconnecting can be reached from the operating station. An official representative of …

Identification Of Linear System With Feedback Input, Jyh Yang

Theses

A new procedure with feedback input is presented for identification of continuous-time systems. Using Lyapunov's direct method to prove it asymptotic stability. For the procedure to be applicable, it's assumed that all the state variables of the plant are accessible and that there is no measurement noise so the model reference scheme can be used to identify the parameters of the plant.

The procedure results in the convergence of every parameter of a model to the corresponding one of the system as the time approaching to infinite i.e. t→∞. Digital computer simulations are provided to demonstrate the feasibility of the …

A Survey Of The Literature On Moisture In Building Construction, Lawrence Charles Tiboldo

Theses

The aim of this thesis was to evaluate the literature on moisture in buildings for its usefulness in the understanding of the theory involved in moisture transfer in buildings. Because analysis of the effects of moisture migration and development of condensation control strategies in structures depends on the knowledge of heat and moisture transfer theory as well as on the documented data on building material properties, evaluation of the usefulness of the reference material will serve as an indication of the availability of pertinent information.

To fulfill this objective, the literature listed as references to Chapter 21 of the 1985 …

Robot Manipulators And Control, Theresa Wu

Theses

This paper on Robot Manipulators brings together theories from three fields : computer graphics, kinematic equations and microprocessor based control.

There are four chapters in this paper, chapter one is the conceptual development on homogeneous transformations, express the position and orientation of the transposition of an object in Cartisian coordinates. Chapter two develops the method of obtaining the Cartisian coordinate position and orientation of the end effector for a manipulator, give the joint coordinate as input and use the homogeneous transformation to express the position and orientation. Chapter 3 is a very difficult one; it solves the parameters for the …

Spectrum Analysis And Real-Time Analysis Of Electroencephalograms, Suzanne Hesook Won

Theses

The analysis of the EEG background waveform is studied by two techniques, spectrum analysis and real-time analysis. The spectrum analysis is performed by using Fast Fourier Transformation (FFT) on a segment of the signal. The resulting signal is classified into different band types such as delta, theta, alpha and beta, to see the power in each band, and the magnitude of the power on the left and right side if the brain is evaluated for asymmetry. The mean power frequency shows the frequency where the maxinum power exists in each band type. This type of analysis provides overall information of …

An Investigation Of The Application Of Utility Theory To Determine The Value Of Time: The Demand For Interactive Information Systems In Student Markets, Gordon S. Kalley

Theses

The economic rational of many contemporary businesses is the provision of services or labor saving equipment which their customers' pay for in order• to save themselves time. A major decision such an enterprise must make prior to entry into the market i=_ whether enough of a market exists to make its entry worthwhile. Such firms would be able to make better resource allocation decisions if they could have a quantitative measure of the relationship of their consumer's valuation of time vis a vi money. This study proposes such a measure.

Interactive information systems, whose viability depends to a large degree …

Reliability Evaluation Of Liquid Crystal Displays Under Accelerated Test Conditions, Ravi Sankar Kalyandrug

Theses

This study has determined the effects of high temperature and humidity on the reliability of liquid crystal dis-plays.

Reliability life testing was done on variety of LCD samples under different operating conditions. All the besting was done under accelerated conditions, including high temperature of 85°C and relative humidity of 70%. A number of failure modes were identified in the long series'of tests.

Among many failure modes such as peeling of seal, degradation of polarizers etc., the most important is the degradation of alignment of liquid crystal molecules. Leakage current measurements were made on all the LCD samples before and after …

Model Experiment Of Rock Fracturing Caused By Driving Piles, Dai-Heyng Lee

Theses

The geotechical construction problem of rock fracturing caused by pile driving is investigated using a laboratory model. One inch diameter closed bottom steel pipes were driven into a simulated rock mass consisting of masonry bricks having an average compressive strength 3,200 psi. Both single pile and five pile model groups were tested. The single pile tests indicated that a threshold of penetration behavior occurred at a theorical hammer energy of 100 ft-lb and this was used for the group tests. Penetration rates were measured using an optical level.

Piles in the five pile model group were initially driven to a …

Basic Concepts In Cad & Cam, Chao-Ming Liu

Theses

As the computer revolution is nearing its end, CAD/CAM concepts are being widely accepted and evolving rapidly. This thesis begins with a disscussion of the significance and advantages of CAD/CAM and their relationship with automation. Hardware and software components involved are then introduced. Product design under CAD is done by computers. Computers perform engineering analysis, necessary calculations, and dynamic simulation to complete the complex design. The geometric elements and operational primitives are provided by a data base system. The major components of CAM are then introduced. The term CAM is used in a broader sense to include CAPP, MRP, NC, …

The Flexible Manufacturing System And Its Development In Taiwan, Chi-Shuan Liu

Theses

FMS is a new kind of manufacturing system which is flexible enough to handle a limited variety of parts. It usually consists of three main components: machine tools, a material handling system, and a computer control system. The material handling system is the key to integrating manufacturing cells into the FMS. The machine tools used in FMS are programmable and computer-controlled, having the ability to change their operation process rapidly to deal with product changeovers and part design changes. The digital computer used in FMS has the capability of handling various manufacturing processes which are not capable of being controlled …

Further Development Of Preparation And Measurement Techniques For Triode-Sputtered Mercury Cadmium Telluride Thin Films, Tai-On Chan

Theses

The modified MRC 8800 R.F. triode sputtering system was used for mercury vapor sputtering (Hg^1-xCd^x)Te targets onto N-type (111) silicon substrates with a resistivity of 70 to 90 ohm-cm. Deposition rates were in the 2.6 to 3.6 A/sec range, A Hall mobility value, at 87°K, of 2550 Cm²/V•sec with a carrier concentration of 7(10¹⁵) cm^-3 was obtained for 9 μm thick films with an X-value of 0.25. Obtaining good sputtered films reliably was dependent on having targets that would not crack when bombarded with mercury ions. Improvements in the methods used …

Computer Analysis On Discontinuity Of Cylindrical Pressure Vessels With Various Heads, Ku-Shiang Sheu

Theses

This thesis uses FORTRAN programs to compute the maximum shear stresses of the cylindrical pressure vessel with various heads. They are cylindrical, spherical, ellipsoidal, flat and conic shapes. Also the maximum shear stresses for the bimetallic joints at the vessel wall and away from the vessel wall are analyzed. Numerical examples are given for each case to facilitate the applications.

Frequency Characterization Of A Thin Linear Antenna Using Diakoptic Theory, Howard Harold Smith

Theses

A frequency dependent analytical expression for the input impedance of a thin wire antenna is obtained using diakoptic theory. In diakoptic theory the linear antenna is seperated into electrically short segments where each segment is treated as a two-port network. This approach eliminates the need for an integral equation formulation. An impedance matrix is found which characterizes coupling between all segments. By expanding the free space Green's function in a power series in wavenumber k each entry in the resultant impedance matrix is obtained as a function of frequency. Enforcement of the continuity of currents and equality of scalar potentials …

Enhancement Of The Thermophysical Capability Of The Chemical Engineering Simulation System, Joydeep Banerjee

Theses

The CHESS (Chemical Engineering Emulation System) is a generalized steady-state, sequential-modular chemical process simulation program. In this thesis, the thermophysical data prediction capability of CHESS has been expanded by: incorporating more accurate thermodynamic phase-behavior models, by utilizing these models in generating a wider range of thermophysical properties, and providing an updated and expanded database for pure-component physical properties.

The overall performance of the simulation system's thermophysical package has been evaluated using the study of a subprocess consisting of various rotational equipment modules.

In this work, the Chao-Seader liquid phase activity coefficient model has been reinstalled in conjunction with the original …

A Study Of Parameters Indicating Microbial Activity In Mixed Aerobic Cultures, William Smith

Theses

Mixed liquor suspended solids (MLSS), oxygen uptake rate (OUR) and general dehydrogenase activity, as expressed by the reduction of the electron-acceptor Dye 3-(4',5'-dimethylthiazol-2-yl)-2, 4-diphenyltetra-zolium bromide (MTT), were compared for their ability to measure microbial activity in mixed aerobic cultures. A fourth parameter, specific enzyme activity, was dropped from consideration because of the difficulty of developing a satisfactory experimental technique. Measurement of the parameters was applied to the biodegradation of phenol and o-chlorophenol by activated sludge from a municipal sewage treatment plant, and by two commercially available bacterial preparations.

MLSS, although the most commonly used of the three parameters tested, is …

Laminar Flow Through A Porous Annulus With Surface Suction, Stelios C. Nicolaides

Theses

A theoretical investigation was conducted to obtain the velocity, pressure and shear stress distributions for incompressible, steady, fully developed, laminar flow through an annulus, with a uniformly porous inside tube wall. Suction at the walls is a result of the pressure difference across the porous wall.

The continuity equation, momentum equation and the Darcy's law for suction velocity are analysed with an integral method. The resulting differential equations were solved using a numerical technique.

For the same radii ratio, dimensionless inlet pressures on both sides of the porous wall and dimensionless porous resistance, the dimensionless length required to reach zero …

Present Reliability Of Liquid Crystal Display Devices, C. N. Suresh

Theses

The purpose of this Thesis is to study the life of liquid crystal display devices as at present available in the market place. To accomplish this, accelerated tempera-ture conditions at 77°C and 85°C were used.

During the last few years, there has grown a tremendous interest in wide range temperature operating and fast LCDs. It is therefore important to understand how LCDs behave under these conditions.

The reliability of a liquid crystal display is usually measured in terms of a quantative degradation in electrical performance and a degradation in visual appearance. The degradation in visual appear6knce may manifest itself as …

Analysis Of Bolted Rock By Computer Modeling, Niann-Chyun Wang

Theses

A computer model-based on VAX-ANSYS system was developed to model the behavior of multi-layer rock systems reinforced by pretensioned rock bolts. Three models were utilized for this study. The third model represents the friction between interlayers occuring due to the tensioned rock-bolts. Results obtained from this study compare favorably with those obtained from equations developed from model studies. An attempt has been made to study the effects of creep on the behavior of the rock-layer system.

Test 1574: Deutz-Fahr Dx 3.50 Diesel And Deutz-Allis 6260 Diesel (8-Speeds), Nebraska Tractor Test Lab

Nebraska Tractor Tests

EXPLANATION OF THE TEST PROCEDURE General Tractors are tested at the University of Nebraska according to the Agricultural Tractor Test Code approved by the American Society of Agricultural Engineers and the Society of Automotive Engineers or official Nebraska test procedure. The manufacturer selects the tractor to be tested and certifies that it is a stock model. Each tractor is equipped with the common power consuming accessories such as power steering, power lift pump, generator, etc., if available. Power consuming accessories may be disconnected only when the means for disconnecting can be reached from the operating station. An official representative of …

Air Force Problems With Birds In Hangars, Timothy J. Will

Eastern Wildlife Damage Control Conference: 2nd (1985)

The Air Force's Bird-Aircraft Strike Hazard (BASH) Team has been dealing with bird hazards to aircraft for over ten years, primarily through awareness programs, direct assistance to military bases, and through R&D aimed at world-wide BASH reduction. As with any problem where a biological system (in this case, birds) is involved, diversification is important in developing solutions. The BASH Team has recommended a variety of methods for working with hazards from birds. One area of particular concern is the nuisance of pest birds in hangars. These structures are extremely alluring to birds, which seek the roof-supporting I-beams and bars for …

Test 1575: Deutz-Fahr Dx 4.70 Diesel And Deutz-Allis 7085 Diesel (15-Speed), Nebraska Tractor Test Lab

Nebraska Tractor Tests

EXPLANATION OF THE TEST PROCEDURE General Tractors are tested at the University of Nebraska according to the Agricultural Tractor Test Code approved by the American Society of Agricultural Engineers and the Society of Automotive Engineers or official Nebraska test procedure. The manufacturer selects the tractor to be tested and certifies that it is a stock model. Each tractor is equipped with the common power consuming accessories such as power steering, power lift pump, generator, etc., if available. Power consuming accessories may be disconnected only when the means for disconnecting can be reached from the operating station. An official representative of …

Process For Recovering Terephthalic Acid From Waste Polyethylene Terephthalate, Richard A. Lamparter, Bruce A. Barna, David R. Johnsrud

Michigan Tech Patents

Terephthalic acid (TPA) is recovered from used polyethylene terephthalate beverage containers by reacting comminuted containers in a reaction zone with an aqueous medium containing ammonium hydroxide at elevated temperatures and pressures to form a water soluble diammonium salt of TP A, separating any undissolved solids from the reaction product, acidifying the remaining reaction product to liberate TP A, and separating the precipitated TPA. A portion of the liquid remaining after separation of TPA can be mixed with lime or slaked lime, the resulting mixture treated in an ammonia stripper to remove ammonia therefrom and the ammonia overheads from the stripper …

Test 1576: Deutz-Fahr Dx 6.50 Diesel And Deutz-Allis 7120 Diesel 24-Speed, Nebraska Tractor Test Lab

Nebraska Tractor Tests

EXPLANATION OF THE TEST PROCEDURE General Tractors are tested at the University of Nebraska according to the Agricultural Tractor Test Code approved by the American Society of Agricultural Engineers and the Society of Automotive Engineers or official Nebraska test procedure. The manufacturer selects the tractor to be tested and certifies that it is a stock model. Each tractor is equipped with the common power consuming accessories such as power steering, power lift pump, generator, etc., if available. Power consuming accessories may be disconnected only when the means for disconnecting can be reached from the operating station. An official representative of …

Test 1573: Ford 2810 (8x2) Diesel 8-Speed, Nebraska Tractor Test Lab

Nebraska Tractor Tests

EXPLANATION OF THE TEST PROCEDURE General Tractors are tested at the University of Nebraska according to the Agricultural Tractor Test Code approved by the American Society of Agricultural Engineers and the Society of Automotive Engineers or official Nebraska test procedure. The manufacturer selects the tractor to be tested and certifies that it is a stock model. Each tractor is equipped with the common power consuming accessories such as power steering, power lift pump, generator, etc., if available. Power consuming accessories may be disconnected only when the means for disconnecting can be reached from the operating station. An official representative of …

Cultivating Attachment For Crop Harvester Support Vehicle, Larry D. Swetnam, James H. Casada, Linus R. Walton

Biosystems and Agricultural Engineering Faculty Patents

A cultivator for attachment to a crop harvester including at least one tool frame member with soil tilling tools adjustably mounted relative thereto. A shaft is provided rotatably mounted relative to a support frame of the crop harvester. An actuating member is operatively connected to the shaft and the support frame for selectively imparting rotation to the shaft. A link is operatively, pivotally connected between the tool frame member and the support frame for guiding the frame member and the soil tilling tools between a raised position out of engagement with a ground surface and a lowered position into engagement …

Vibration Coupling In Continuous Belt And Band Systems, C. D. Mote, W-Z Ben Wu

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Small transverse oscillation of an endless band supported by wheels couples the response of the free spans of the band to oscillation of the wheels. The coupling arises from the finite curvature of the free spans of the band when its bending stiffness is finite. Significant modeling error can occur if a single span of the band is modeled as a simply supported, axially moving beam. The coupling provides an opportunity to dissipate vibration energy. Experiments and finite element analyses support the coupling discussion presented. © 1985 Academic Press Inc.

Test 1572: Zetor 7245 And 7211 Diesel 10-Speeds, Nebraska Tractor Test Lab

Nebraska Tractor Tests

EXPLANATION OF THE TEST PROCEDURE General Tractors are tested at the University of Nebraska according to the Agricultural Tractor Test Code approved by the American Society of Agricultural Engineers and the Society of Automotive Engineers or official Nebraska test procedure. The manufacturer selects the tractor to be tested and certifies that it is a stock model. Each tractor is equipped with the common power consuming accessories such as power steering, power lift pump, generator, etc., if available. Power consuming accessories may be disconnected only when the means for disconnecting can be reached from the operating station. An official representative of …

Test 1571: Zetor 5245, 5211, 3320 And 3340 Diesel 10-Speeds, Nebraska Tractor Test Lab

Nebraska Tractor Tests

EXPLANATION OF THE TEST PROCEDURE General Tractors are tested at the University of Nebraska according to the Agricultural Tractor Test Code approved by the American Society of Agricultural Engineers and the Society of Automotive Engineers or official Nebraska test procedure. The manufacturer selects the tractor to be tested and certifies that it is a stock model. Each tractor is equipped with the common power consuming accessories such as power steering, power lift pump, generator, etc., if available. Power consuming accessories may be disconnected only when the means for disconnecting can be reached from the operating station. An official representative of …

Acuta Enews September 1985, Vol. 14, No. 9

ACUTA Newsletters

In This Issue

President's Message

Party Line

Inevitable result of breakup of AT&T is reduction of jobs

The Shape of Phone Calls to Come: Dial 'M' for Muddle

Consultant's Corner

Top 17 Installation Screw-Ups

Load And Resistance Factor Design Of Cold Formed Steel Comparative Study Of Design Methods For Cold Formed Steel, Lan-Cheng Pan, Wei-Wen Yu, Brian K. Snyder

CCFSS Library (1939 - present)

Allowable Stress Design is the current method used to design cold-formed steel structural members and connections. In this design approach, factors of safety are used to compute the allowable design stresses which are compared to the actual maximum stresses that will occur in the member during the life of the structure. In recent years, the Load and Resistance Factor Design (LRFD) method has been developed for the design of hot-rolled steel shapes and the design of cold-formed steel structural members. This method is based on probabilistic and statistical techniques to account for the many uncertainties involved with the actual design. …