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Articles 1 - 30 of 48

Full-Text Articles in Mechanical Engineering

Modeling Of Purge Valve Closure, William W. Durgin, Benito Zannini Dec 1983

Modeling Of Purge Valve Closure, William W. Durgin, Benito Zannini

Office of the Provost and Vice President of Academic Affairs Scholarship

In some nuclear reactor containment isolation applications, butterfly valves with pneumatic actuators are used to close pipelines in the event of containment pressure transients resulting from postulated accidents. A model is developed which predicts the closure time history of such valve/actuator systems under prescribed transients. Examples are presented which show the importance of the valve and actuator characteristics. It was found that actuation delays of sufficient magnitude could allow the dynamic torque to exceed the available actuator torque, thus preventing valve closure.


Quantitative Ultrasonic Nondestructive Evaluation Methods, R. Bruce Thompson Dec 1983

Quantitative Ultrasonic Nondestructive Evaluation Methods, R. Bruce Thompson

Ames Laboratory Publications

Quantitative ultrasonic techniques for determining the serviceability of structural components are reviewed. Particular emphasis is placed on the use of forward and inverse elastic wave scattering theory as a fundamental foundation for predicting such engineering parameters as the probability of flaw detection and for developing improved techniques for flaw sizing. Ultrasonic measurement techniques for the determination of distributed failure-related properties such as residual stresses are discussed, and the status of the prediction of failure by the detection of acoustic emission precursors is reviewed.


Augmentation Of Free Surface Heat And Mass Transfer Due To Electrostatic Fields, Alan F. Smelewicz, Mark P. Majcher, James B. Nystrom, William W. Durgin Nov 1983

Augmentation Of Free Surface Heat And Mass Transfer Due To Electrostatic Fields, Alan F. Smelewicz, Mark P. Majcher, James B. Nystrom, William W. Durgin

Office of the Provost and Vice President of Academic Affairs Scholarship

Experiments were conducted to measure heat transfer rates and mass transfer rates from a water surface in the presence of electrostatic fields of various strengths generated between the water surface and a wire grid above the surface.

Heat transfer rates were determined by the temperature decay after heating the test and control basins. Mass transfer rates were determined by measuring the water loss while holding the basins at fixed temperatures.

It was found that very little increase in transfer coefficients took place for voltages below an onset voltage which depended on atmospheric conditions and test geometry. The heat transfer coefficient ...


Light Actuated Remote Control Security System, Jack C. Klaus, Larry D. Schroeder, Vincent H. Casteel, Kenneth E. Schwartz Oct 1983

Light Actuated Remote Control Security System, Jack C. Klaus, Larry D. Schroeder, Vincent H. Casteel, Kenneth E. Schwartz

Iowa State University Patents

A remote control security apparatus includes a lock element movable between locked and unlocked positions by an electrically actuated power device. The operator is provided with a portable transmitter adapted to generate light which is interrupted at a predetermined frequency so as to produce an encoded light signal. This signal is detected by a light transceiver which generates an independent signal at the same predetermined frequency and which compares the frequencies of the detected signal and independent signal. If these frequencies are substantially the same, the transceiver actuates the power means to move the lock element to its unlocked position ...


Flow Past A Liquid Drop With A Large Non-Uniform Radial Velocity, Satwindar S. Sadhal, Portonovo S. Ayyaswamy Aug 1983

Flow Past A Liquid Drop With A Large Non-Uniform Radial Velocity, Satwindar S. Sadhal, Portonovo S. Ayyaswamy

Departmental Papers (MEAM)

In this analysis, the translation of a liquid drop experiencing a strong non-uniform radial velocity has been investigated. The situation arises when a moving liquid drop experiences condensation, evaporation or material decomposition at the surface. By simultaneously treating the flow fields inside and outside the drop, we have obtained physical results relevant to the problem. The magnitude of the radial velocity is allowed to be very large, but the drop motion is restricted to slow translation. The solution to the problem has been developed by considering a uniform radial flow with the translatory motion introduced as a perturbation. The role ...


A Heat Pump Assisted Shower, Jim Mcgovern May 1983

A Heat Pump Assisted Shower, Jim Mcgovern

Articles

An energy-efficient water-heating system for a shower is proposed consisting of a low-powered heat pump, a storage tank and an instantaneous heater which, it is felt, may yield a favourable overall cost, in addition to reducing the primary energy consumption. Some preliminary work has been carried out in exploring this concept. It was considered at the outset that an overall coefficient of performance (COP) of 2 should be readily achieved. Values close to this have been realised with the first experimental prototype.


Bicycle Rack, Robert J. Hostert, Michael J. Mathiasmeier, Robert J. Gilbert Feb 1983

Bicycle Rack, Robert J. Hostert, Michael J. Mathiasmeier, Robert J. Gilbert

Iowa State University Patents

A bicycle rack designed to support and lock a bicycle by the bicycle's front center post. Support and lock brackets for individual bicycles are horizontally disposed fork arrangements formed by two joined U-shaped members. Oppositely extending locking brackets allow pairs of bicycles to be conveniently placed along a series of evenly spaced posts and cross-bars.


Bevolute Gear System, Willis M. Carter Jan 1983

Bevolute Gear System, Willis M. Carter

Mechanical Engineering Faculty Patents

The present invention relates to a bevolute gearing system which transmits torque between non-intersecting shafts at right angles to each other. The bevolute gear system includes a pinion gear which is flat and in one plane. The pinion gear is designed to include teeth which are shaped in the form of an involute spiral. The bevolute gear system includes a second gear which is also designed to include teeth which are shaped in the form of an involute spiral. The second gear is mounted on a non-intersecting axis at a right angle to the axis of the pinion gear. The ...


Utilization And Examination Of A Mass Consistent Wind Flow Model, Joanne M. Carrol Jan 1983

Utilization And Examination Of A Mass Consistent Wind Flow Model, Joanne M. Carrol

Wind Energy Center Masters Theses Collection

MATHEW, a mass consistent wind flow model is applied to given areas in Princeton and Windsor, Massachusetts for the purpose of determining wind flow fields in those areas and examining the HATIIEW program itself. The MATHEW model which was originated by Sherman at Lawrence Livermore Laboratories to give a three-component time-independent nondivergent wind velocity field. The model has been verified by its creators and is accepted as a valid method for calculating wind fields. A description of the model is given. The analytic foundation of the model is elucidated, the numerical technique is described and the architecture of the MATHEW ...


An Improved Rotary Singulator, Burford J. Furman, J. M. Henderson Jan 1983

An Improved Rotary Singulator, Burford J. Furman, J. M. Henderson

Faculty Publications, Mechanical Engineering

A new operating approach for a previously existing rotary singulator was developed which improves the versatility of the device. This was accomplished by the implementation of a modular mechanism that performed the basic functions of agitation, gating, pocket formation, and exit, all inherent in this type of singulation device.


Test 1482: Versatile 835 Series 3 Diesel 12-Speed, Tractor Museum Jan 1983

Test 1482: Versatile 835 Series 3 Diesel 12-Speed, Tractor Museum

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 1484: Hesston 466, 466 Dt, 466 Dt/L And 466/L Fiat Models (12-Speed), Tractor Museum Jan 1983

Test 1484: Hesston 466, 466 Dt, 466 Dt/L And 466/L Fiat Models (12-Speed), Tractor Museum

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 1483: Versatile 875 Series 3 Diesel 12-Speed, Tractor Museum Jan 1983

Test 1483: Versatile 875 Series 3 Diesel 12-Speed, Tractor Museum

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 1485: Hesston 666, 666 Dt, 666 Dt/L And 666/L Fiat Models (12-Speed), Tractor Museum Jan 1983

Test 1485: Hesston 666, 666 Dt, 666 Dt/L And 666/L Fiat Models (12-Speed), Tractor Museum

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 1486: White Farm Equipment-Iseki 2-75 Diesel 16-Speed, Tractor Museum Jan 1983

Test 1486: White Farm Equipment-Iseki 2-75 Diesel 16-Speed, Tractor Museum

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 1487: White Farm Equipment-Iseki 2-88 Diesel 18-Speed, Tractor Museum Jan 1983

Test 1487: White Farm Equipment-Iseki 2-88 Diesel 18-Speed, Tractor Museum

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 1491: Ford 2910 (8x2) Diesel 8-Speed, Tractor Museum Jan 1983

Test 1491: Ford 2910 (8x2) Diesel 8-Speed, Tractor Museum

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 1492: Ford 2910 (8x4) Diesel 8-Speed, Tractor Museum Jan 1983

Test 1492: Ford 2910 (8x4) Diesel 8-Speed, Tractor Museum

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 1493: Ford 3910 (8x2) Diesel 8-Speed, Tractor Museum Jan 1983

Test 1493: Ford 3910 (8x2) Diesel 8-Speed, Tractor Museum

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 1494: Ford 3910 (8x4) Diesel 8-Speed, Tractor Museum Jan 1983

Test 1494: Ford 3910 (8x4) Diesel 8-Speed, Tractor Museum

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 1495: Kubota M4050dt And M4050 Diesel 8-Speed, Tractor Museum Jan 1983

Test 1495: Kubota M4050dt And M4050 Diesel 8-Speed, Tractor Museum

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 1496: Kubota M4950dt And M4950 Diesel 12-Speed, Tractor Museum Jan 1983

Test 1496: Kubota M4950dt And M4950 Diesel 12-Speed, Tractor Museum

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 1497: Kubota M5950dt And M5950 Diesel 12-Speed, Tractor Museum Jan 1983

Test 1497: Kubota M5950dt And M5950 Diesel 12-Speed, Tractor Museum

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 1498: Kubota M6950dt And M6950 Diesel 12-Speed, Tractor Museum Jan 1983

Test 1498: Kubota M6950dt And M6950 Diesel 12-Speed, Tractor Museum

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 1499: Kubota M7950dt And M7950 Diesel 12-Speed, Tractor Museum Jan 1983

Test 1499: Kubota M7950dt And M7950 Diesel 12-Speed, Tractor Museum

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 1500: Ford 1510 (12x4) Manual Diesel 12-Speed, Tractor Museum Jan 1983

Test 1500: Ford 1510 (12x4) Manual Diesel 12-Speed, Tractor Museum

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 1501: Ford 1510 (12x4) Synchro Diesel 12-Speed, Tractor Museum Jan 1983

Test 1501: Ford 1510 (12x4) Synchro Diesel 12-Speed, Tractor Museum

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 1502: Ford 1710 (12x4) Manual Diesel 12-Speed, Tractor Museum Jan 1983

Test 1502: Ford 1710 (12x4) Manual Diesel 12-Speed, Tractor Museum

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 1504: John Deere 750 Diesel 8-Speed, Tractor Museum Jan 1983

Test 1504: John Deere 750 Diesel 8-Speed, Tractor Museum

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 1503: Ford 1710 (12x4) Synchro Diesel 12-Speed, Tractor Museum Jan 1983

Test 1503: Ford 1710 (12x4) Synchro Diesel 12-Speed, Tractor Museum

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 ...