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Viewing 169981 to 170010 of 190648
1969-02-01
Technical Paper
690555
Ralph W. Holmes
This paper describes the application of hyifraulically powered wheels to a logging trailer which is pulled by a 225-HP tractor. It discusses the advantages of the hydrostatic transmission as a means empowering the trailer. The hydraulic circuitry and its operation is examined. A cutaway view of the wheel is used to explain the operating features. Performance figures are displayed and component arrangement on the tractor are shown. Other applications of the same hydraulic wheel are presented.
1969-02-01
Technical Paper
690552
Bradford H. Kenyon, Pete Thatcher
Fleet management is now possible at a more profitable level than ever before. There are ways of reducing the cost of the record keeping, etc., required by the many regulatory bodies imposing themselves on business. It is possible not only to reduce these costs, but to actually increase the available information and to improve one's profit by pinpointing hidden cost areas within a fleet that are not now apparent. A fleet owner now can have current information on each vehicle information to show which equipment is the most profitable to operate, information that allows for the testing of vehicle component parts, and even information to measure a vehicle's production compared with its cost of operation. Simple, flexible computer programs for vehicle management are made available today by large petroleum suppliers. Because these programs have already been designed and have proven to be successful, there generally is no need to make any capital investment in order to use one.
1969-02-01
Technical Paper
690553
Jerry M. Page, M. Lee Gustafson
To meet future demands for forest products, intensive management practices must be implemented. Fertilization has great potential for increasing production, and it is receiving widespread interest in the timber industry. Helicopters and fixed wing aircraft have been used to broadcast fertilizer in most operational trials to date. Application cost has been a considerable portion of the total cost. Recent experiments using four wheel drive ground vehicles showed that application cost could be reduced considerably. Selective placement of fertilizer and combining operations are also possible with ground vehicles and cost can be reduced even further. Aircraft will continue to be used over difficult terrain and dense, natural stands where ground vehicles cannot operate effectively. The use of ground vehicles will increase, and the lower application cost should accelerate the growth of forest fertilization.
1969-02-01
Technical Paper
690558
R. L. Courtney, C. S. Roscoe
This paper characterizes the features and describes some of the benefits of the present generation of multigrade “MS” oils. Particular emphasis is placed upon viscosity retention characteristics as a function of the stability of the viscosity index improver. Comparative automobile field tests in private commuter, taxicab, and highway service are shown for both SAE 10W-30 and a carefully compounded SAE 10W-40 oil. Observations of cylinder and piston ring wear, crankcase deposits, PCV valve cleanliness, and oil economy are reported.
1969-02-01
Technical Paper
690559
L. C. Quigg
The introduction of the super jets has increased the fueling rate requirements to a point where the present hydrant systems and fueling vehicles are not adequate. This paper reviews some of the problems and some of the solutions that can be used to comply with the fueling requirements of the large aircraft.
1969-02-01
Technical Paper
690556
J. L. Frank, D. E. Bowman
This paper describes a simulation of a mobile equipment closed loop hydraulic position control system, performed on a digital computer using a modeling program. Features are cylinder nonsymmetry, bulk modulus varying as a function of pressure and entrained air, valve pressure/flow, and pump pressure/flow characteristics. Results indicate that the most critical parameters, based on effect on performance and difficulty in predicting their values, are damping and bulk modulus. The simulation can be readily extended to include other effects such as cylinder and load stiction and Coulomb friction, time varying externally applied loads, and valve underlap or overlap.
1969-02-01
Technical Paper
690557
N. A. Henein, J. A. Bolt
Possible mechanisms for smoke formation in the diesel engine are discussed. Emphasis is placed on the effects of some engine and fuel factors on carbon formation during the course of combustion, including cetane number, fuel volatility, air charge temperature, and after-injection. The tests were made with a single-cylinder, open chamber research engine, with three fuels, covering a wide range of inlet air temperatures and pressures. There is evidence that smoke intensity increased with increase in the cetaine number of the fuels with inlet air temperatures near atmospheric. Increase in the air charge temperature caused an increase in smoke intensity for volatile fuels and had an opposite effect on less volatile fuels for the open chamber engine used. The smoke intensity was found to increase dramatically with after-injection, with all other parameters kept constant. The concept that flame cooling is the main cause for smoke formation is examined.
1969-02-01
Technical Paper
690562
R. J. Holtgrieve, G. Kuhn
In efforts to develop larger engines for the Oliver Models 2050 and 2150 tractors, the Oliver Corp. found it could use a modified version of a 478 cu in. engine already designed for Army trucks. This paper describes the resulting new 118 and 131 hp tractor engines that emerged from compromises with the military engine. One of the most compatible features of the engine was its M.A.N. combustion system. Included in the Appendices are results of tests made on the tractors by the University of Nebraska Agricultural Experiment Station at Lincoln.
1969-02-01
Technical Paper
690563
A. R. Kaduk, G. Mladsi, E. D. Clise
Utility vehicles perform a specialized job, and consequently require special design consideration. Frame, spring, and axle selection for this type of vehicle can no longer be based solely on gross vehicle weight, but must be tailored to do the required job.
1969-02-01
Technical Paper
690560
F. A. Brown
This paper discusses the planning by United Air Lines for the introduction of the B-747 and DC-10. Involved in the planning are ground support equipment, facility modifications and other changes required to handle this aircraft through present facilities. A second phase of the planning involves a total automated approach to the new equipment and modifications required. New baggage/cargo equipment, in-flight dining facilities, larger boarding rooms, passenger automated ticketing and fare collection, as well as a new boarding system have been developed by United for the new aircraft.
1969-02-01
Technical Paper
690561
Harold W. Adams
Many aspects of an airplane's design are directly affected by the results of ground support analyses. The areas an airplane designer studies in making an overall analysis of ground operation and support are described and examples are given to illustrate each step of the analysis.
1969-02-01
Magazine
1969-02-01
Technical Paper
690055
Gerhard H. Junker
The theory of self-loosening of preloaded bolted connections when subjected to vibration is discussed. The significance of self-loosening as a cause of failure is explained, and design guidance to avoid self-loosening is given. The test methods are described and discussed in connection with a newly designed testing machine that yields quantitative data for evaluating locking properties. These methods can be applied to all types of locking elements. Finally, a simplified method for broad scale testing and inspection is proposed.
HISTORICAL
1969-02-01
Standard
J380_196902
Specific gravity is a nondestructive test used as a quality control check of the consistency of formulation and processing of brake lining. The specific gravity and the range of specific gravity are peculiar to each formulation and, therefore, the acceptable values or range must be established for each formulation by the manufacturer. Specific gravity alone shows nothing about a materials in use performance. The specific gravity of sintered metal powder friction materials, particularly those which have steel backing members, is usually determined somewhat differently. Reference ASTM B 376. Purpose To establish a uniform procedure for determining the specific gravity of brake friction material.
HISTORICAL
1969-02-01
Standard
J589A_196902
A turn signal switch is that part of a turn signal system by which the operator of a vehicle causes the turn signal lamps to function. A Class A turn signal switch may be used on any vehicle but is intended for use on multipurpose passenger vehicles, trucks, and buses that are 80 in or more wide overall. A Class B turn signal switch is intended for use in passenger cars, motorcycles, and multipurpose passenger vehicles, trucks, and buses of less than 80 in overall width.
HISTORICAL
1969-02-01
Standard
J941B_196902
This SAE Recommended Practice establishes the location of drivers' eyes inside a vehicle. Elliptical (eyellipse) models in three dimensions are used to represent tangent cutoff percentiles of driver eye locations. Procedures are provided to construct 95th and 99th percentile tangent cutoff eyellipses for a 50/50 gender mix, adult user population. Neck pivot (P) points are defined in Section 6 to establish specific left and right eye points for direct and indirect viewing tasks described in SAE J1050. These P points are defined only for the adjustable seat eyellipses defined in Section 4. This document applies to Class A Vehicles (Passenger Cars, Multipurpose Passenger Vehicles, and Light Trucks) as defined in SAE J1100. It also applies to Class B vehicles (Heavy Trucks), although these eyellipses have not been updated from previous versions of SAE J941. The appendices are provided for information only and are not a requirement of this document.
HISTORICAL
1969-02-01
Standard
J565B_196902
This SAE Standard provides test procedures, performance requirements, and guidelines for semiautomatic headlamp beam switching devices.
1969-02-01
Technical Paper
690565
Michael J. Pannucci, Ghassan S. Tayeh
Abstract This paper discusses a computer-aided bearing design and manufacturing system believed to be unique in the bearing industry. The system is used primarily to design bearings to meet specific applications and to predict the performance characteristics of bearings under conditions of stress, deflection, torque, etc. Advantages realized from the system include better customer service, reduction in the amount of routine design work, and a reduction in the overall cost of the bearings.
1969-02-01
Technical Paper
690182
S. J. Pachernegg
The Willans line represents the relationship between fuel energy input and engine output. Extrapolation to a zero line of fuel input provides a useful approximation of the mechanical losses. Linearity of these curves is assumed in the range from low load downward to a hypothetical zero value of the indicated work. A critical analysis revealed that these lines must have a continued curvature and also that the location of the zero point of indicated power does not coincide with zero fuel input. The paper suggests corrections and defines a directional field which may improve the accuracy of the loss analysis.
HISTORICAL
1969-02-01
Standard
J910A_196902
This standard defines the test conditions, procedures and performance specifications for 6, 12 and 24-V manually actuated hazard warning signal switch.
1969-02-01
Technical Paper
690554
John Kurelek, John J. Denovan
Koehring-Waterous has developed a stump area pulpwood harvesting machine which promises to make a major reduction in the labor content and cost of pulpwood. This one operator machine fells, limbs, tops, bucks, forwards, and truck loads its seven cord load of 8 ft pulpwood in less than 2 hr. Some keys to its successful operation are: a large, articulated, rubber tired vehicle; a vertical, automatic tree processing tower; a unique log handling and storage method; extensive use of oil hydraulics; and design for reliability in woods.
1969-02-01
Technical Paper
690665
R. V. Blackhurst
Abstract Glass fiber reinforced composites are being used successfully in the Rolls-Royce RB.162 pure jet lift engine. It has been demonstrated that composites can be designed to replace conventional materials in certain environments and valuable weight will be saved, without incurring a high cost penalty. This paper deals with only the design aspects of the composite hardware, and covers the evolution of the production standard of intake and nose cowl, front bearing housing, compressor casing, and the rotor blading.
1969-02-01
Technical Paper
690471
L. E. Tucker, D. R. Olberts
The fatigue properties of gray cast iron are presented. Included in these properties are monotonic tension and compression data and cyclic strain control fatigue data. Estimations of fatigue properties determined from the measured fatigue data are compared to predicted fatigue properties based on static properties. Samples with average hardnesses of 171 and 213 Bhn iron were tested and the results compared. The results of this investigation revealed that the strain amplitude cycles-to-failure plot of gray cast iron was independent of hardness of the iron.
1969-02-01
Technical Paper
690539
Charles M. Heinen
Spectacular progress has been made in reducing pollutants from the internal combustion engine. Time and money - a multimillion expenditure - are needed to improve the internal combustion engine so that pollution can be reduced to almost any level desired. To date, medical research does not appear to indicate that much beyond what is being planned in the way of vehicle controls is called for in the foreseeable future.
1969-02-01
Technical Paper
690114
Joseph M. Ross, Robert R. Slaymaker
This paper deals with the classic problem of dynamically loaded bearings. It differs from previous, related work by being directed toward the engine designer rather than a Ph.D. thesis committee. An automotive engineer, aided by a computer, can use the included computation procedure to get a reasonable picture of bearing performance. He can discover the effect of changes in speed, power, dimensions, and oil on potential trouble spots, and he can see the difference in behavior of main bearings, crankpin bearings, and wrist pin bushings. Typical orbit diagrams, based on this procedure, are included for comparison with photographs of test bearings for which the journal paths were drawn.
HISTORICAL
1969-02-01
Standard
AIR1047A
The factors involved in the selection of a quick-disconnect are grouped into the following classifications for the purpose of discussion: a. functional considerations; b. weight considerations; c. environmental performance factors; d. end fitting types; and e. additional considerations. A quick-disconnect coupling as used in this AIR is one that can be rapidly and repetitively connected and disconnected without excessive fluid loss. The relative importance of the design factors depends upon the fluid medium of the particular system in which quick-disconnect is to be used. The effect of the fluid media on each factor is discussed in this report where applicable. The purpose of this AIR is to guide users in the proper selection of quick-disconnect couplings for their specific application in fluid systems.
HISTORICAL
1969-02-01
Standard
ARP993A
The scope of this document is limited to encompass terminology, symbols, performance criteria and methods reflecting the current status of the technology. The purpose of this document is to promote the use of a common terminology and useful symbols and to encourage users and manufacturers of fluidic devices and systems to conform to meaningful standards of performance. This document is intended for use as the basis for a procurement specification for fluidic devices and systems when the need for such a specification arises. This document shall be the starting point for future SAE documents, either through revision or addition, in the field of fluidics as such documents become necessary.
1969-02-01
Technical Paper
690034
Ronald M. Gabel
This paper presents the results of an investigation directed toward the design and demonstration of a fluid-cooled turbine for an advanced small gas turbine. The primary objective was to advance and demonstrate high turbine inlet temperature technology utilizing a thermosiphon cooling system concept for a small gas turbine engine to the level that will provide a potential for doubling the specific horsepower relative to current small aircraft propulsion engines.
1969-02-01
Technical Paper
690033
Sven-Olof Kronogard
This paper presents an exhaustive and also a simplified method for deriving the parameters necessary for the design and development of compressors for jet engines, turbochargers, and automotive gas turbines. Much of the theory and experimental data have been extracted from existing reports of studies and investigations, but a considerable amount of practical design work and experimental evidence is offered to confirm theoretical applications.
1969-02-01
Technical Paper
690035
S. L. Moskowitz, T. E. Schober
With the increasing need for high performance, small gas turbine engines in the 500–1000 hp class, there is a requirement for use of high turbine inlet temperature in the range of 2500 F. Engines designed at these temperatures will supply more than twice the horsepower available in present day noncooled engines. Reliable operation of the turbine component at gas temperatures that exceed the melting temperature of the materials, however, requires selection and application of an efficient and practical blade cooling method. This paper presents the design of a transpiration air cooled, single stage, high work, axial flow, small turbine suitable for 2500 F turbine inlet temperature and capable of driving an 8:1 pressure ratio 4 lb/sec compressor. The manufacturing techniques associated with incorporating transpiration cooling into the small blading and the electron beam welding of these blades to the disc to form an integrally welded rotor assembly are also discussed.

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