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Technical Paper

Consulting Engineering Overseas

1987-11-01
872021
The consultant encounters major differences in language, economics, and culture. He finds smaller markets, more intrusive governments, and more masters to serve. Research on the country's history, political system, economics, culture, industry and agriculture is essential preparation. Probably the biggest unique requirement is empathy for people of other cultures. Restructuring the Agricultural Machinery Industry in Hungary originally involved primarily new machine tools. As a result of a World Bank study team, it shifted its emphasis somewhat to include a rationalized product line, less materials handling, and more training. Farm Equipment Manufacturing Technology Centers in India started with a concentration on additional machine tools in a design institute. The design team's study placed more emphasis on training and on improving the interaction between designers, manufacturers, and farmers.
Technical Paper

SOME ELEMENTS OF GAS TURBINE PERFORMANCE

1957-01-01
570026
THIS paper is an elementary nonmathematical discussion of the essential thermal processes of gas turbines with emphasis on turbine types suitable for use in vehicles. A brief history is followed by discussion of the limitations imposed by strength of materials. The effects of pressure ratio, compressor and turbine efficiency, turbine inlet temperature, and atmospheric temperature upon output and thermal efficiency, are discussed., The effects of regeneration upon thermal efficiency at full and part load, with particular emphasis upon the latter, are discussed, and the regenerator is stated to be essential to obtain acceptable fuel mileage in vehicle use. The probable performance parameters of a vehicle turbine of about 200 rated hp are explored.
Technical Paper

Folding Mechanisms Overview

1985-11-01
851110
The various types of folding mechanisms used on agricultural machinery to provide for highway transport are discussed. The unique design and performance features are reviewed. Also the implication of the use of this type of equipment on public highways is reviewed.
Technical Paper

Single Vehicle Wet Road Loss of Control; Effects of Tire Tread Depth and Placement

2002-03-04
2002-01-0553
When an automobile is driven on wet roads, its tires must remove water from between the tread and road surfaces. It is well known that the ability of a tire to remove water depends heavily on tread depth, water depth and speed, as well as other factors, such as tire load, air pressure and tread design. It is less well known that tire tread depth combined with placement can have an adverse effect on vehicle handling on wet roads. This paper investigates passenger car handling on wet roads. Flat bed tire testing, three-dimensional computer simulation and skid pad experimental testing are used to determine how handling is affected by tire tread depth and front/rear position of low-tread-depth tires on the vehicle. Some skid pad test results are given, along with corresponding simulations. A literature review also is presented. Significant changes in tire-road longitudinal and lateral friction are shown to occur as speed, tread depth and water depth vary, even before hydroplaning occurs.
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