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Articles 31 - 36 of 36
Full-Text Articles in Engineering
A Model For Solid Waste Collection Costs, Bruce Anderson
A Model For Solid Waste Collection Costs, Bruce Anderson
Retrospective Theses and Dissertations
No abstract provided.
Survey Of Techniques Used By Small Manufacturing Businesses To Implement Production Control, William De Hoog
Survey Of Techniques Used By Small Manufacturing Businesses To Implement Production Control, William De Hoog
Retrospective Theses and Dissertations
No abstract provided.
Functional Cost Estimating Techniques Applied To Operational Flight Trainers, James H. Gardner
Functional Cost Estimating Techniques Applied To Operational Flight Trainers, James H. Gardner
Retrospective Theses and Dissertations
No abstract provided.
High Pressure Hydraulic Supply System Model, William H. Mock
High Pressure Hydraulic Supply System Model, William H. Mock
Retrospective Theses and Dissertations
A mathematical model is derived to provide quasi-steady state predictions of the performance of a high pressure hydraulic supply system, using equations which govern the physical processes as opposed to equations which match input-output characteristics. Model equations are developed to describe the operation of the power source, control valves, energy source, gas side of the system, hydraulic accumulator, the motorpump, and hydraulic side of the system. The accuracy of the model is then checked by inserting known parameters from a previously developed control system and comparing model predictions with performance data from this system.
Selection Considerations For A Servovalve, Frank J. Niemas Jr.
Selection Considerations For A Servovalve, Frank J. Niemas Jr.
Retrospective Theses and Dissertations
Servovalves are a key factor in determining the performance characteristics of an electrohydraulic position servo. This paper examines the interrelationships between servovalve parameters and system requirements. A brief description of the configuration and operation of a typical servovalve is presented. Key servovalve parameters are identified, defined, and discussed. System performance considerations are identified, and the interrelationships between system requirements and servovalve parameters are examined. Examples of servovalve parameters for missile, aircraft and industrial systems are given to illustrate the effect of system requirements on a servovalve. Finally, general guide-lines for selecting and specifying servovalve parameters are given.
Aging Characteristics Of Al-4.5% Cu-1.4% Mg-0.5% Ag, James Kelly White
Aging Characteristics Of Al-4.5% Cu-1.4% Mg-0.5% Ag, James Kelly White
Retrospective Theses and Dissertations
The effects of single-step and two-step aging treatments on the tensile properties of an A1-4.5%Cu-1.4%Mg- 0.5%Ag alloy have been investigated. Results showed that a maximum ultimate tensile strength of 75 ksi can be attained by single-step aging 24 hr at 170°C. The two-step aging treatments consisting of first aging one week at 80°C followed by aging at 160° and 190°C led to lower strength properties than simple one-step aging. Reversion treatments applied to fully age-hardened alloy resulted in an almost progressive loss of strength in the 250° to 375° range.