WorldCat Identities

Coe, Harold H.

Overview
Works: 31 works in 79 publications in 1 language and 1,428 library holdings
Classifications: TL521.3,
Publication Timeline
Key
Publications about  Harold H Coe Publications about Harold H Coe
Publications by  Harold H Coe Publications by Harold H Coe
Most widely held works by Harold H Coe
Lubrication and performance of high-speed rolling-element bearings by Erwin V Zaretsky ( )
3 editions published in 1985 in English and held by 238 WorldCat member libraries worldwide
Comparison of predicted and measured temperatures of UH-60A helicopter transmission by Harold H Coe ( Book )
5 editions published in 1989 in English and held by 140 WorldCat member libraries worldwide
The 2109-kW (2828-hp) UH-60A Black Hawk helicopter transmission was one of the transmissions used to obtain an experimental data base. Component improvements or new transmission concepts can thus be evaluated by comparison with the established data. In this investigation the transmission was instrumented internally and tested over a range of operating conditions. The speed was varied from 50 to 100 percent of the full rated value, and the torque was varied from 10 to 100% of the full rated value. Temperatures of internal bearings and gears were measured. The computer program Planetsys was used to simulate the thermal performance of this transmission. The calculated temperatures were then compared with the corresponding measured values. The highest measured temperature was 405 K (270 F) on the outer ring of the high-speed input shaft roller bearing, at the 100% power condition. In general, the predicted temperatures compared very well with the measured values, most of them being within 5 kelvin (9 deg F). Specifically, the temperatures predicted for the single-row spherical roller planetary bearing averaged only about 4 kelvin (8 deg F) lower than the highest measured value. Helicopter rotor transmissions; Planetary gears; Roller bearings. (EDC)
Effect of interference on roller-bearing fatigue life by Harold H Coe ( Book )
2 editions published in 1986 in English and held by 115 WorldCat member libraries worldwide
Computer-aided design analysis of 57-mm, angular-contact, cryogenic turbopump bearings by Elizabeth S Armstrong ( Book )
3 editions published in 1988 in English and held by 82 WorldCat member libraries worldwide
Testing of UH-60A helicopter transmission in NASA Lewis 2240-kW (3000-hp) facility by Andrew M Mitchell ( Book )
3 editions published in 1986 in English and held by 82 WorldCat member libraries worldwide
Effect of speed and press fit on fatigue life of roller-bearing inner-race contact by Harold H Coe ( Book )
3 editions published in 1985 in English and held by 79 WorldCat member libraries worldwide
Spur-gear optimization using SPUROPT computer program by Harold H Coe ( Book )
4 editions published in 1991 in English and held by 76 WorldCat member libraries worldwide
SPUROPT, a computer program developed for optimizing spur gear designs, was updated by installing a new subroutine that uses AGMA 908-B89 standards to calculate the J-factor for determining tooth-bending stress. The updated SPUROPT program was then used to optimize a spur gear set for either maximum fatigue life, minimum dynamic load, or minimum weight. All calculations were made with constraints on as many as 13 parameters by using three design variables: the number of teeth, diametral pitch, and tooth-face width. Results depended largely on constraint values. When the limiting bending stress was set at a high value, the optimal solution was the highest allowable number of teeth. When the allowable bending stress was lowered, the optimal solution moved toward the fewest number of teeth permitted. Final results were also affected by the amount of transmission error. A lower error permitted a higher number of teeth
Maximum life spiral bevel reduction design by M Savage ( Book )
1 edition published in 1992 in English and held by 75 WorldCat member libraries worldwide
Optimization is applied to the design of a spiral bevel gear reduction for maximum life at a given size. A modified feasible directions search algorithm permits a wide variety of inequality constraints and exact design requirements to be met with low sensitivity to initial values. Gear tooth bending strength and minimum contact ratio under load are included in the active constraints. The optimal design of the spiral bevel gear reduction includes the selection of bearing and shaft proportions in addition to gear mesh parameters. System life is maximized subject to a fixed back-cone distance of the spiral bevel gear set for a specified speed ratio, shaft angle, input torque and power. Significant parameters in the design are: the spiral angle, the pressure angle, the numbers of teeth on the pinion and gear and the location and size of the four support bearings. Interpolated polynomials expand the discrete bearing properties and proportions into continuous variables for gradient optimization. After finding the continuous optimum, a designer can analyze near optimal designs for comparison and selection. Design examples show the influence of the bearing lives on the gear parameters in the optimal configurations. For a fixed back-cone distance, optimal designs with larger shaft angles have larger service lives
Bending strength model for internal spur gear teeth by M Savage ( Book )
3 editions published in 1995 in English and held by 72 WorldCat member libraries worldwide
Internal spur gear teeth are normally stronger than pinion teeth of the same pitch and face width since external teeth are smaller at the base. However, ring gears which are narrower, have an unequal addendum or are made of a material with a lower strength than that of the meshing pinion may be loaded more critically in bending. In this study, a model for the bending strength of an internal gear tooth as a function of the applied load pressure angle is presented which is based on the inscribed Lewis constant strength parabolic beam. The bending model includes a stress concentration factor and an axial compression term which are extensions or the model for an external gear tooth. The geometry of the Lewis factor determination is presented, the iteration to determine the factor is described and the bending strength J factor is compared to that of an external gear tooth. This strength model will assist optimal design efforts for unequal addendum gears and gears of mixed materials. (AN)
Thermal analysis of a planetary transmission with spherical roller bearings operating after complete loss of oil by Harold H Coe ( Book )
2 editions published in 1984 in English and held by 68 WorldCat member libraries worldwide
Effect of hoop stress on ball bearing life prediction by Erwin V Zaretsky ( Book )
1 edition published in 1995 in English and held by 67 WorldCat member libraries worldwide
Comparison of predicted and experimental performance of large-bore roller bearing operation to 3.0 million DN by Harold H Coe ( Book )
5 editions published in 1980 in English and held by 66 WorldCat member libraries worldwide
Predicted and experimental performance of jet-lubricated 120-millimeter-bore ball bearings operating to 2.5 million DN by Harold H Coe ( Book )
4 editions published in 1978 in English and held by 66 WorldCat member libraries worldwide
Bearing inner- and outer-race temperatures and friction power losses were calculated using two computer programs. The values obtained were compared with previously reported experimental data for 120 mm bore bearings which operated at thrust loads to 22 240 N (5000 lb), shaft speeds to 20 800 rpm, and with two lubricant flow rates. One program severely underestimated the power loss, while the other, called SHABERTH, provided a good prediction of both race temperatures and power losses
Cooling requirements of ball bearings lubricated by glass-fiber-filled polytetrafluoroethylene retainers in cold hydrogen gas by Harold H Coe ( )
4 editions published in 1970 in English and held by 23 WorldCat member libraries worldwide
Experiments were performed with 40-mm-bore ball bearings operating at shaft speeds to 35 000 rpm and thrust loads to 400 lbs (1780 N) in 60 deg R (33 K) hydrogen gas. The minimum coolant flow rate equation developed for bearings equipped with this retainer material was similar to the equation determined in a previous study for bearings with a bronze-filled polytetrafluoroethylene (PTFE) retainer. Retainer wear rate was very low; some inner-race ball-track wear was evident for bearings that had been run for more than 7 hours
Summary of thermophysical properties of potassium by Harold H Coe ( Book )
3 editions published in 1965 in English and held by 22 WorldCat member libraries worldwide
Steady-state performance of a modified Rankine cycle system using water by David B Fenn ( Book )
3 editions published in 1966 in English and held by 21 WorldCat member libraries worldwide
Performance of 75-millimeter-bore bearings to 1.8 million DN with electron-beam-welded hollow balls by Harold H Coe ( )
3 editions published in 1970 in English and held by 20 WorldCat member libraries worldwide
Fatigue performance of hollow and solid ball bearings
Steady-state performance of a seven-tube NaK-cooled potassium condenser by David B Fenn ( Book )
3 editions published in 1967 in English and held by 19 WorldCat member libraries worldwide
Performance of 75-millimeter-bore bearings using electron-beam-welded hollow balls with a diameter ratio of 1.26 by Harold H Coe ( Book )
3 editions published in 1975 in English and held by 17 WorldCat member libraries worldwide
Analysis of stresses at the bore of a drilled ball operating in a high-speed bearing by Harold H Coe ( Book )
3 editions published in 1973 in English and held by 16 WorldCat member libraries worldwide
 
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Languages
English (61)