A Study of Deflection of Gear Teeth Under Dynamic Loads PDF Download

Author: Dan James Mihalopoulos
Publisher:
ISBN:
Category : Gearing
Languages : en
Pages :

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Author: Earle Buckingham
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ISBN:
Category : Gearing
Languages : en
Pages : 86

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Author: C. E. Passerello
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ISBN:
Category :
Languages : en
Pages : 233

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Book Description
Two concepts relating to gear dynamics were studied. The first phase involved the analysis of the effect of the speed of a moving load on the dynamic deflections of a gear tooth. A single spur gear tooth modelled using finite elements was subjected to moving loads with variable velocities. The tooth tip deflection time histories were plotted, from which it was seen that the tooth tip deflection consisted of a quasistatic response with an oscillatory response superimposed on it whose amplitude was dependent on the type of load engagement. Including the rim in the analysis added flexibility to the model but did not change the general behaviour of the system. The second phase involved an investigation to determine the effect on the dynamic response of the inertia of the gear tooth. A simplified analysis using meshing cantilever beams was used. In one case, the beams were assumed massless, in the other, the mass (inertia) of the beams are included. From this analysis it was found that the inertia of the tooth did not affect the dynamic response of meshing cantilever beams. Keyword: Gear noise; Vibration; Machine design; Finite element analysis.

Author: Rodney James Caldwell
Publisher:
ISBN:
Category : Gearing, Spur
Languages : en
Pages : 372

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Author: Romualdas Kasuba
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ISBN:
Category : Gearing
Languages : en
Pages : 226

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Author: David G. Lewicki
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Category : Computer programs
Languages : en
Pages : 24

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How dynamic load affects the surface pitting fatigue life of external spur gears was predicted by using NASA computer program TELSGE. Parametric studies were performed over a range of various gear parameters modeling low-contact-ratio involute spur gears. In general, gear life predictions based on dynamic loads differed significantly from those based on static loads, with the predictions being strongly influenced by the maximum dynamic load during contact. Gear mesh operating speed strongly affected predicted dynamic load and life. Meshes operating at a resonant speed or one-half the resonant speed had significantly shorter lives. Dynamic life factors for gear surface pitting fatigue were developed on the basis of the parametric studies. In general, meshes with higher contact ratios had higher dynamic life factors than meshes with lower contact ratios. A design chart was developed for hand calculations of dynamic life factors. (Author).

Author: Paul Jay Umberger
Publisher:
ISBN:
Category :
Languages : en
Pages : 74

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The dynamic loads acting on gear teeth are very complex. To better understand dynamic loads, this research was carried out with the objectives of measuring experimentally dynamic loads and the frictional forces between gear teeth in mesh. By using strain gages mounted on the sides of the teeth, the transverse component of the dynamic load was measured and is shown for all phases of contact. Using the transverse component at the pitch radius, the dynamic load ratios were computed and found to be substantially lower than predicted by the Buckingham equation. However, sufficient information for evaluating the frictional force was not obtained and further research will be required to evaluate the radial component of the dynamic load. (Author).

Author: John Sinclaire Howland
Publisher:
ISBN:
Category : Gearing
Languages : en
Pages : 72

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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

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By John Sinclaire Howland.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 20

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An experimental study to investigate the bending stress in aerospace-quality spiral bevel gears was performed. Tests were conducted in the NASA Lewis Spiral Bevel Gear Test Facility. Multiple teeth on the spiral bevel pinion were instrumented with strain gages and tests were conducted from static (slow roll) to 14400 RPM at power levels to 540kW (720 hp). Effects of changing speed and load on the bending stress were measured. Experimental results are compared to those found by three-dimensional finite element analysis.