WorldCat Identities

Coy, John J.

Overview
Works: 55 works in 88 publications in 1 language and 1,543 library holdings
Classifications: TL521.3, 621.833
Publication Timeline
Key
Publications about  John J Coy Publications about John J Coy
Publications by  John J Coy Publications by John J Coy
Most widely held works by John J Coy
Gearing by John J Coy ( )
2 editions published in 1985 in English and held by 204 WorldCat member libraries worldwide
Vibration characteristics of OH-58A helicopter main rotor transmission by David G Lewicki ( Book )
3 editions published in 1987 in English and held by 87 WorldCat member libraries worldwide
Special cases of friction and applications by F. L Litvin ( Book )
1 edition published in 1984 in English and held by 81 WorldCat member libraries worldwide
Minimization of the vibration energy of thin-plate structure by Katsumi Inoue ( Book )
1 edition published in 1992 in English and held by 80 WorldCat member libraries worldwide
Advanced transmission studies by John J Coy ( Book )
3 editions published in 1988 in English and held by 79 WorldCat member libraries worldwide
Helicopter transmission research at NASA Lewis Research Center ( Book )
2 editions published in 1988 in English and held by 78 WorldCat member libraries worldwide
A joint helicopter transmission research program between NASA Lewis Research Center and the U.S. Army Aviation Systems command has existed since 1970. Program goals are to reduce weight and noise and to increase life and reliability. This paper reviews significant advances i technology for gears and transmissions and describes the experimental facilities at NASA Lewis for helicopter transmission testing. A description of each of the rigs is presented along with some significant results from the experiments
Helicopter transmission testing at NASA Lewis Research Center by David G Lewicki ( Book )
1 edition published in 1987 in English and held by 77 WorldCat member libraries worldwide
Identification and proposed control of helicopter transmission noise at the source ( Book )
1 edition published in 1987 in English and held by 77 WorldCat member libraries worldwide
Statistical model for asperity contact time fraction in elasthydrodynamic lubrication by Steven M Sidik ( Book )
4 editions published in 1978 in English and held by 76 WorldCat member libraries worldwide
On dynamic loads in parallel shaft transmissions I -- Modelling and analysis by Hsiang-Hsi Edward Lin ( Book )
2 editions published in 1987 in English and held by 76 WorldCat member libraries worldwide
A model of a simple parallel-shaft, spur-gear transmission is presented. The model is developed to simulate dynamic loads in power transmissions. Factors affecting these loads are identified. Included are shaft stiffness and inertia, load and power source inertia, tooth geometry, tooth stiffness, local compliance due to contact stress, load sharing, and friction. Governing differential equations are developed and a solution procedure is outlined
On dynamic loads in parallel shaft transmissions II -- Parameter study by Hsiang-Hsi (Edward) Lin ( Book )
3 editions published in 1987 in English and held by 74 WorldCat member libraries worldwide
Solutions to the governing equations of a spur gear transmission model, developed in NASA TM-100180 (AVSCOM TM-87-C-2) are presented. Factors affecting the dynamic load are identified. It is found that the dynamic load increases with operating speed up to a system natural frequency. At operating speeds beyond the natural frequency the dynamic load decreases dramatically. Also, it is found that the transmitted load and shaft inertia have little effect upon the total dynamic load. Damping and friction decrease the dynamic load. Finally, tooth stiffness has a significant effect upon dynamic loading: the higher the stiffness, the lower the dynamic loading. Also, the higher the stiffness the higher the rotating speed required for peak dynamic response
Computer-aided design of bevel gear tooth surfaces by Shuo Hung Chang ( Book )
2 editions published in 1989 in English and held by 74 WorldCat member libraries worldwide
This paper presents a computer aided design procedure for generating bevel gears. The development is based on examining a perfectly plastic, cone- shaped gear blank rolling over a cutting tooth on a plane crown rack. The resulting impression on the plastic gear blank is the envelope of the cutting tooth. This impression and envelope thus form a conjugate tooth surface. Equations are presented for the locus of points on the tooth surface. The same procedures are then extended to simulate the generation of a spiral bevel gear. The corresponding governing equations are presented
Life analysis of multiroller planetary traction drive by John J Coy ( Book )
4 editions published in 1981 in English and held by 71 WorldCat member libraries worldwide
Correlation of asperity contact-time fraction with elastohydrodynamic film thickness in a 20-millimetr-bore ball bearing by John J Coy ( Book )
4 editions published in 1979 in English and held by 70 WorldCat member libraries worldwide
Comparison of predicted and measured elastohydrodynamic film thickness in a 20-millimeter-bore ball bearing by John J Coy ( Book )
3 editions published in 1979 in English and held by 68 WorldCat member libraries worldwide
Transmission efficiency measurements and correlations with physical characteristics of the lubricant by John J Coy ( Book )
1 edition published in 1984 in English and held by 59 WorldCat member libraries worldwide
Data from helicopter transmission efficiency tests have been compared to physical properties of the eleven lubricants used in those tests. The tests were conducted with the OH-58 helicopter main rotor transmission. Efficiencies ranged from 98.3 to 98.8 percent. The data was examined for correlation of physical properties with efficiency. There was a reasonable correlation of efficiency with absolute viscosity if the viscosity was first corrected for temperature and pressure in the lubricated contact. Between lubricants, efficiency did not correlate well with viscosity at atmospheric pressure. Between lubricants, efficiency did not correlate well with calculated lubricant film forming capacity. Bench type sliding friction and wear measurements could not be correlated to transmission efficiency and component wear
Summary of drive-train component technology in helicopters by Gilbert J Weden ( Book )
1 edition published in 1984 in English and held by 58 WorldCat member libraries worldwide
A review of current helicopters was conducted to determine the technology in the drive-train systems. This paper highlights the design features including reliability, maintainability and survivability characteristics, in transmission systems for the OH-58, UH-1, CH-47, and UH-60 helicopters. In addition, trade-offs involving cost, reliability and life are discussed
Fatigue life analysis for traction drives with application to a toroidal type geometry by John J Coy ( Book )
3 editions published in 1976 in English and held by 50 WorldCat member libraries worldwide
Life analysis of restored and refurbished bearings by John J Coy ( Book )
2 editions published in 1977 in English and held by 28 WorldCat member libraries worldwide
Analysis of dynamic capacity of low-contact-ratio spur gears using Lundberg-Palmgren theory by John J Coy ( Book )
3 editions published in 1975 in English and held by 19 WorldCat member libraries worldwide
 
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Audience Level
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Audience Level
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  Kids General Special  
Audience level: 0.88 (from 0.82 for Gearing ... to 0.93 for Transmissi ...)
Languages
English (46)