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1985-07-01
Technical Paper
851318
G. L Hoffman
The Naval Air Development Center has developed a thermal model of the F-14 Environmental Control System (ECS) using the EASY5 dynamic anaysis computer program. In addition to discussing the modeling effort, this paper also details several improvements made to the EASY5 program in an attempt to improve its accuracy, flexibility, and computational stability. Also highlighted is a simplified version of the F-14 EASY5 ECS model which is being used to conduct trade studies and to calculate the initial conditions required to run the EASYS program.
1985-07-01
Technical Paper
851158
Richard A. Borowski
This paper describes the Short Takeoff and Landing (STOL) and Maneuver Technology Demonstrator. It relates government requirements for performance and for specific technology to be developed. The two-dimensional, thrust vectoring and reversing engine exhaust nozzle and its integration with the control system are described. The use of modern control system design techniques to meet evolving criteria for aircraft handling during the STOL task is discussed. Use of on-board sensors to substitute for ground-based approach aids used in weather is outlined. Expected performance improvements in takeoff and landing and in maneuvering flight are related to the technology being demonstrated. The paper closes with a discussion of the potential tactical and strategic impact of the technology.
1985-07-01
Standard
ARP1836
This SAE Aerospace Recommended Practice (ARP) outlines the functional and design requirements for a battery powered, self-propelled belt conveyor for handling baggage and cargo at aircraft bulk cargo holds. Additional considerations and requirements may legally apply in other countries. As an example, for operation in Europe (E.U. and E.F.T.A.), the applicable EN standards shall be complied with.
1985-07-01
Standard
ARP1308B
The intent of this ARP is to identify selected electrical connectors, their general application characteristics, and associated configuration options recommended for new design, repair, and retrofit purposes. It is acknowledged that those connectors listed herein will not completely satisfy all aerospace vehicle and equipmetn requirements but optimization of the use of these components will facilitate standardization in the form of maximum utilization of a minimum variety of connectors.
1985-06-01
Technical Paper
851237
Hiroaki Nishimura, Masaaki Katsumata
Basic vehicle performance, such as Safety, Comfort and Economy, are by dependent on tire performance, and it is the air pressure in the tire which assures this performance. However, tire air has a tendency to leak naturally, making it necessary to check them periodically. Since a deterioration in vehicle performance resulting from a drop on tire air pressure can not be directly felt by the driver, the number of people maintaining their tires sufficiently is relatively few. There have been many tire pressure warning devices developed which advise the driver when the pressure drops below a prescribed level. Differing from conventional devices, the TWD-III features a 7-step digital display (at a pitch of 0.1 kgf/cm2) which shows the pressure of each tire within an optional range, and it also has a flat tire warning function. The employment of echo effect from clystal vibrator resonance precludes the need to attach a power source on the tire.
1985-06-01
Technical Paper
851210
Yoshiro Kimbara, Kazuo Shinoda, Hiroshi Koide, Nobuyuki Kobayashi
T-LCS (TOYOTA LEAN COMBUSTION SYSTEM ) has made the engine possible to be operated with very lean mixture over 22 of air-fuel ratio, and achieved the NOx reduction and the improvement of fuel economy. This system has two features, one of which is the feed-back control of lean mixture strength using the LEAN MIXTURE SENSOR that has been newly developed. The other feature is the improved combustion through the SWIRL CONTROL VALVE and individual timing control of fuel injection for each cylinder. The influence of the test patterns, the vehicle weight and the air-fuel ratio on the exhaust emissions of lean combustion system has been examined and the results are reported in this paper.
1985-06-01
Technical Paper
851223
James F. Wakenell
A series of 500-hour duration tests were conducted using two medium-speed diesel engines to screen residual blended fuels for future locomotive field testing. The test fuels were railroad diesel fuel and two No. 6 fuel oil/diesel fuel blends. The performance, wear, fuel handling, and deposit characteristics of each fuel were evaluated. Combustion deposits, fuel handling, and wear were found to be the primary factors that limited No. 6 fuel oil content of blends. A 40 SSU viscosity blend was found to be acceptable for field trials, but a 55 SSU blend was not due to fuel filtration and combustion deposits problems.
1985-06-01
Technical Paper
851222
Conan P. Furber
Alternative fuels can be used in locomotive diesel engines as a means to reduce fuel costs or as fuel extenders when sufficient quantities of suitable lower cost fuels are not available. Broadened fuel purchasing guidelines, based on engine fuel tolerance limitation tests, offer a potential for reducing fuel costs. Fuels such as alcohols, certain vegetable oils, shale oils, and heavy oil blends can be used to extend fuel supplies. Fuel tolerance limitations of existing engines can be increased through modifications such as staged injection or the use of ceramic coatings. This paper describes the methods used by the Association of American Railroads Alternative Fuels Research Program to determine engine fuel tolerance limitations and extend engine fuel tolerance limits.
1985-06-01
Standard
J297_198506
This SAE Standard is intended to improve operator efficiency and convenience by providing guidelines for the uniformity of location and direction of motion of operator controls used on industrial wheeled equipment. The controls covered are those centrally located at the operator's normal position. General These guidelines are based on the principle that a given direction of movement of any control produces a consistent and expected effect. Where confusion may result from the motion of the control, the effect from movement of the control shall be clearly and permanently identified.
1985-06-01
Standard
J1388_198506
This recommended practice is intended to provide personnel protection guidelines for skid steer loaders. This SAE Recommended Practice is intended as a guide towards standard practice, but may be subject to frequent change to keep pace with experience and technical advances, and this should be kept in mind when considering its use. This recommended practice provides performance criteria for newly-manufactured loaders and it is not intended for in-service machines.
1985-05-15
Technical Paper
850962
Charles W. Rodman, Howard C. Meacham
A system using FM multiplexed radio telemetry was developed and built to provide a data link between operating tank track and the tank hull. Field tests of the system showed that attention to details of the design of the antenna and battery system were successful in avoiding analytical problems. The field test also demonstrated that the data obtained with the link correlated well with the results of computer modelling.
1985-05-15
Technical Paper
850963
Richard J. Goff, Thomas M. Lloyd
In developing retrofit noise controls for mobile mining equipment, it is critical to document their effectiveness. In our particular work, we need to know first how the controls affect noise levels by the operator ear and second how the controls affect levels inside hearing protectors. While scientific experiments demand repeatability, a true evaluation would assess actual working conditions, which, in the case of mining, is not very repeatable. To obtain data, the following procedure has been developed. After discussions with the operator, a course is set up to simulate the actual operation of the machine. This is fairly repeatable. Then two miniature microphones connected to a dual track tape recorder are put into place - one at the entrance to the operator's ear canal, the other on his shoulder.
1985-05-01
Standard
AIR1273
This SAE Aerospace Information Report establishes a positive identification of the functions and, if applicable, the hazards and direction of flow of pipe, hose, tube, or electrical conduit lines.
1985-05-01
Standard
J1428_198505
This recommended practice covers the requirements of magnetic or thermal circuit breakers for use in marine applications for 50 V DC or less. The purpose of this recommended practice is to ensure that the specified circuit breakers will reliably provide overcurrent protection.
1985-05-01
Standard
J702_198505
This SAE Recommended Practice establishes the recommended locations for the air brake and electrical connections for the back of a truck-tractor and the front of a truck-trailer.
1985-05-01
Standard
J821_198505
This SAE Recommended Practice applies to off-road, self-propelled work machines defined in SAE J1116 JUN81. Purpose This document is intended as a guide in establishing recommended material specifications and identification of the on-board electrical wiring systems for construction, agricultural, and off-road machines.
1985-04-01
Technical Paper
850806
Jack R. Barr
This paper details the design and features of the 651E, 657E, and 657E Push-Pull Wheel Tractor Scraper. Emphasis was placed on the availability, reliability, and serviceability of these units.
1985-04-01
Technical Paper
850798
Dennis Graham
This paper identifies the problem associated with early failure of Push-Pull Cables, which is due to external and internal Contaminants. The design and development of new seals to eliminate these contaminants produced cables that can operate efficiently for at least one million cycles. Two new developments were possible with these design improvements; (1) a new line of more flexible cables, and (2) a control system that can shift manual transmissions remotely.
1985-04-01
Technical Paper
850799
Robert H. Hurlow
Shifting of manual transmissions by means of cables has been generally unsatisfactory until the last few years. Successful shifting systems have recently been developed, as a result of improvements in cable technology, installation techniques, and a “systems” approach to the problem. Benefits resulting from use of these new devices include better performance, cost and weight savings, reduced noise and vibration in the cab, and longer life with no maintenance required. Extensive laboratory and field testing, combined with several years of production, has proven the viability of the concept.
1985-04-01
Technical Paper
850795
Kenneth C. Wolfgram
A new Caterpillar Wheel Loader has been developed to provide a loader in the 2 cubic meter (2.5 cubic yard) bucket capacity-category. This paper provides a review of the machine design objectives and summarizes the design features included to meet worldwide manufacturing and marketing requirements.
1985-04-01
Technical Paper
850783
Hugh C. Morris, Giles K. Sorrells
For some time, Caterpillar Tractor Co. has been marketing a new transmission control system for wheel-tractor scrapers and off-highway trucks. The new system is composed of an electronic microprocessor control box coupled with an individual clutch modulation hydraulic control. This system has resulted in increased vehicle productivity, improved reliability and serviceability, decreased complexity, and increased commonality of parts. This paper describes the concept, design, and test and evaluation process used to develop the new controls before production.
1985-04-01
Technical Paper
850782
Robert C. Boyer
Detroit Diesel Allison introduced it's first electronic controlled transmission, the DP 8000 series transmission, in 1971 with the discrete logic shift pattern generator (SPG). In 1983, a new state-of-the-art digital electronic control option called ATEC (Allison Transmission Electronic Control) was offered on the V 700 series transit coach transmission. Today, the ATEC control is available on all HT 700 series transmissions including the CLBT 700 series off-highway transmissions. In January 1986, the ATEC system will replace the current SPG electronics across the board on 5, 6, 8, and 9000 series off-highway transmissions. It will offer greater capability and increased reliability at a reduced cost over the current electronics. The ATEC system is currently in a field test program that will demonstrate its reliability improvement over the SPG system.
1985-04-01
Technical Paper
850772
Duane Snyder
Caterpillar's Electronic Monitoring System provides continuous monitoring of several machine functions, with visual indication and/or audible warning, depending on the urgency of the situation. On more complex controls, on-board diagnostic LEDs permit the serviceman to quickly determine which peripheral circuit contains a fault, shortening the troubleshooting time and eliminating the need for a major service tool. Dealer and user acceptance of these systems appears to be improving significantly, after the initial familiarization and education period.
1985-04-01
Technical Paper
850860
C. C. Croom, B. J. Holmes
The ability of modern airplane surfaces to achieve laminar flow has been well-accepted in recent years. Obtaining the maximum benefit of laminar flow for aircraft drag reduction requires maintaining minimum leading-edge contamination. Previously proposed insect contamination prevention methods have proved impractical due to cost, weight, or inconvenience. Past work has shown that insects will not adhere to water-wetted surfaces, but large volumes of water required for protection rendered such a system impractical. This paper presents results of a flight experiment conducted by NASA to evaluate the performance of a porous leading-edge fluid discharge ice protection system operated as an insect contamination protection system. In addition, these flights explored the environmental and atmospheric conditions most suitable for insect accumulation.
1985-04-01
Technical Paper
850814
Frederick W. Nelson
Due to the variety of durability tests conducted at John Deere Harvester Works, a computer based monitoring and control system was designed. The system consists of six mini-computers organized by function into two groups. The first computer group provides data monitoring and limit checking as well as simple cycle control and test stand shut down. The second computer group provides the same kind of data monitor and limit checking with the added capability of complex load cycle control including feedback control loops. The multi-user batch p recessing utilities on the computers are used to custom design the monitoring and control software as well as report and plot software for each new test stand.
1985-04-01
Technical Paper
850813
Dwight E. Aussieker
Interfacing programmable controllers with local area networks has provided an economical method of remote monitoring. An application of controller-controller and controller-computer communication links is used to demonstrate the interfacing, monitoring and control of endurance test parameters. This use of remote monitoring has improved the test data quality and test results while reducing manpower requirements.
1985-04-01
Technical Paper
850910
A. Brown
Abstract All engines have limits to the maximum power which may be obtained. This may be dictated by the power transmission capability of the engine and gearbox or physical limits on rotational velocity and temperature to restrict turbine blade creep to an acceptable level. To accommodate this requirement it is customary to use mechanical governors or a Full Authority Digital Electronic Control. However, the mechanical solution suffers from eventual deterioration due to wear, while the electronic approach requires certification to FAA Critical Levels. A solution has been to develop an electronic limiter, which controls the fuel control governing pressure (Py) of a conventional mechanical fuel control in order to meet the design limits of the engine. This paper will describe one such limiter developed by Avelex for aerobatic turboprop engines.
1985-04-01
Technical Paper
852211
Toshiyuki Sekimori, Takayasu Nimura, Yasuaki Yukawa
Since 1970, Toyota Motor Corporation has achieved a total weight reduction of 34% in its overall charging and starting systems. This has been done in a variety of ways: the alternator, starter and battery, the major components of the systems, have been designed for optimal efficiency according to Computer Aided Engineering (CAE) principles; new machining technology has been developed for these components, and new lightweight raw materials have been used in their construction. In addition to these measures, the charging and starting units have been conceived as families so that their sizes could be reduced and significant reductions in weight achieved.
Viewing 20071 to 556 of 556

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