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Viewing 1 to 30 of 169797
2001-03-05
Technical Paper
2001-04-4078
ABSTRACT
2012-06-13
Technical Paper
2012-01-1537
In industrial automotive transmissions, several noises can't be avoided such as gear rattle and gear whine noises. Indeed they result from the choice of gear technology. They just can be reduced by an appropriate design. It is widely acknowledged that gear whine noise is mainly due to transmission error, which depends on many parameters such as driveshaft deflection, gear stiffness and operating torque. All these parameters are not necessarily well-known, which may sometimes result in the choice of a gear geometry that doesn't minimize transmission error. That can lead to customer claims once the vehicle is manufactured. To cope with whine noise customer claims, we investigated a statistical gear optimization method. The principle is to use whine measurement data base on benches to find the best geometry against whine noise after a statistical treatment. The main advantage is that it is not necessary to know precisely all the parameters involved in whine noise. This approach has been used on several whine noise claims at Renault and permitted to solve the problem rapidly and efficiently.
2012-07-15
Technical Paper
2011-01-1126ERR
Erratum for 2011-01-1126
1937-01-01
Technical Paper
370006
Thomas H. MacDonald, H. S. Fairbank
ABSTRACT
1943-01-01
Technical Paper
430031
Walter B. Pyron
ABSTRACT
1943-01-01
Technical Paper
430085
Franklin O. Carroll
ABSTRACT
1943-01-01
Technical Paper
430086
William A. M. Burden
ABSTRACT
1936-01-01
Technical Paper
360025
F. M. Young
ABSTRACT
1973-02-01
Technical Paper
730025
Peter A. Weller
The purpose of the paper is to present concepts and data for the design and application of microcellular urethane form for absorbing energy in automobile bumpers. Of particular significance is the demonstration of temperature compensation that overcomes the significant variation in modulus with change in temperature that is characteristic of urethane. It is shown that by appropriate design techniques, peak force can be maintained constant even with variations in modulus as high as 6:1. Packaged absorbers, free energy blocks, and urethane faced bumpers are discussed.
1973-02-01
Technical Paper
730022
Joseph Dumas
The research on cognitive processes can be usefully organized by considering the human decision maker to be a type of complex information handling system. By examining the characteristics of this system and comparing it with other information handling systems, we gain some insight into its assets and limitations. The nature of these limitations have important implications for how the human information processor functions while driving an automobile. Experience, alertness, and familiarity were found to be necessary for the efficient functioning of this system in a driving environment.
1973-02-01
Technical Paper
730033
U. Seiffert, P. Kirschner
The energy-absorbing bumper system designed for the 1974 Volkswagen in described. Theoretical requirements in bumper design are explained, with emphasis on bumper height, energy tolerance needs, energy absorption, and systems for absorbing the energy involved. The six systems studied are assessed, and the final design chosen is explained. The paper also compares bumper requirements as specified in Europe and the United States.
1973-02-01
Technical Paper
730008
Dennis Eisnach
The aiming of headlamps in nonlaboratory conditions poses many problems. The variables involved are discussed such as qualifications of the personnel, the physical plant, equipment, the consumer, and the vehicle itself. Suggested remedies are directed to the vehicle owner, the administration of inspection programs, and to the engineering and design of the vehicle. Realizing that much jurisdictional red tape is involved in vehicle lighting, it is imperative that the lighting engineer and the state administrators cooperate to the fullest extent to provide the necessary uniformity.
1973-02-01
Technical Paper
730155
W. F. Kruckeberg, D. S. Shaw, R. C. Moore, D. L. Crockett
During the General Motors Experimental Safety Vehicle (ESV) program, a test plan was prepared for submission to the U. S. Department of Transportation (DOT) in compliance with Contract DOT-OS-00095, providing for ESV prototype evaluation in areas of crash injury reduction and accident avoidance. A comprehensive in-house test program, similar to the Government test plan, was prepared and utilized during the prototype development phases of the GM ESV project to validate contract performance specifications.
1973-02-01
Technical Paper
730154
Yasuo Sakai, Hiroaki Miyazaki, Kosaburo Mukai
Many previous studies have revealed that both peak combustion temperature and its progress in the engine cycle are major factors in nitric oxide (NO) formation. In this paper, the relationship between combustion pattern and NO emission has been investigated experimentally, changing combustion chamber shape and spark plug location in a single cylinder, 4-cycle gasoline engine. Besides the effect on NO, the tolerance for lean mixture operation and exhaust gas recirculation was also examined experimentally.
1973-02-01
Technical Paper
730274
R. D. Bagley, R. C. Doman, D. A. Duke, R. N. McNally
The basic flow and heat transfer properties of monolithic ceramic structures are described and related to their use as supports for catalysts to control automobile pollutants. The critical mechanical and thermal properties of suitable ceramic structures are presented along with comparative test methods and results. The importance of microstructure, phase stability, porosity, pore size, open frontal area, cell size, wall thickness, density, and uniformity are discussed. Engine durability results are given for several typical monolith coating catalyst systems.
1975-02-01
Technical Paper
730530
Clark E. Fegraus, Charles J. Domke, James Marzen
The Office of Air Programs, U. S. Environmental Protection Agency, sponsored in 1972 a study of emissions from light-duty vehicles in six cities to determine the contribution to atmospheric pollution by the vehicle population. AESi, under contract to EPA, performed comprehensive tests on 1020 vehicles of the 1957-1971 model years to determine levels of hydrocarbons (HC), carbon monoxide (CO), carbon dioxide (CO2), and oxides of nitrogen (NOx) exhaust emissions. Vehicle exhaust emissions, as measured by the 1972 and 1975 Federal Test Procedure, were of similar magnitude among all cities except Denver, Colo. CO and HC effluents were significantly higher at high altitude, but NOx were significantly lower. Emission results by manufacturers were relatively uniform. The 1968-1971 model year vehicles, which were subject to federal HC and CO exhaust emission controls, exhibited lower mean HC and CO levels than the 1957-1967 model year vehicles, although NOx levels were higher from the new, controlled vehicles.
1972-02-01
Technical Paper
720191
M. R. Andrew, W. J. Gressler, J. K. Johnson, R. T. Short, K. R. Williams
A DAF 44 saloon car has been extensively modified to study some of the problems associated with building, controlling, and driving a car powered by a fuel-cell battery. A prototype hybrid car has been made, using as a power source two 12-cell hydrazine/air fuel batteries in conjunction with six conventional 6-cell lead-acid accumulators. The car has been successfully demonstrated on several occasions, and its performance has been measured. The performance of the car, in its present form, falls between that of today's internal-combustion-engined vehicles and that of secondary-battery-powered ones. However, unlike more conventional electric cars, its ranges under town driving conditions and at its steady cruising speed are not limited by the quantity of stored electricity. Some general comments are made on possible future developments
1979-02-01
Technical Paper
791054
Charles A. Kubilos
Energy storage and dissipation characteristics of common types of servo-controlled loads are examined along with the differences in total energy used between fixed and variable systems. Concepts and equations for system analysis with variable displacement equipment are summarized. Typical examples of variable displacement equipment now in use are presented.
1979-02-01
Technical Paper
791056
W. E. Boehringer
Many contemporary aircraft requiring multiple hydraulic systems for power redundancy have utilized hydraulic power transfer units to provide that service. These units, which are commonly called reversible motor pumps (RMPs), have been heavy, noisy and inefficient with generally very poor differential pressure startup characteristics. A new-generation RMP that has solved many of these problems has been developed for the Douglas DC-9 Super 80 Series aircraft. The new unit emits significantly less noise than existing comparable units and is both weight- and cost-competitive, with excellent startup and running characteristics. It will provide an excellent means of attaining pumping redundancy in future hydraulic system configurations.
1979-02-01
Technical Paper
791057
Stanley J. Skaistis
Controls available to the engineer for quieting hydraulic noises in aircraft are reviewed. Those that are generally the most effective are emphasized and broad guiding principles of quieting are discussed.
1979-02-01
Technical Paper
791059
R. E. Fitzgerald, R. F. Kampe
Boundary layer thrust vector control (BLTVC) of rocket and gas turbine motors is discussed. BLTVC uses ambient air to vector primary flow in an overexpanded nozzle, producing 2-3 times conventional secondary injection deflection angles. Low cost and reliability result from the absence of a secondary flow storage/injection system, and no moving hardware in contact with hot gas. 50 static hot tests ranging from 2-20,000 pounds thrust and wind tunnel tests to M=1.2 and α=60° have verified the design for flight application. Among the applications discussed are a high efficiency nozzleless RPV booster/TVC combination, small missile reaction steering with 90° flow turning, and RPV gas turbine exhaust diverters.
1947-01-01
Technical Paper
470068
Vay Kehly, Robert L. Clampion
ABSTRACT
1956-01-01
Technical Paper
560314
O. E. Hunt
ABSTRACT
1962-01-01
Technical Paper
620568
Arthur A. Fowle
ABSTRACT
1962-01-01
Technical Paper
620567
Clyde McKinley
ABSTRACT
1962-01-01
Technical Paper
620565
Allen Latham, Jr.
ABSTRACT
1962-01-01
Technical Paper
620566
M. H. Streeter
ABSTRACT
1963-01-01
Technical Paper
630499
W. S. Coleman
ABSTRACT
1963-01-01
Technical Paper
630501
K. Bretz
ABSTRACT
1963-01-01
Technical Paper
630498
A. F. Weber
ABSTRACT
Viewing 1 to 30 of 169797

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