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Thursday, July 9, 2020 | History

3 edition of Influence of tooth profile modification on spur gear dynamic tooth strain found in the catalog.

Influence of tooth profile modification on spur gear dynamic tooth strain

Fred B. Oswald

Influence of tooth profile modification on spur gear dynamic tooth strain

by Fred B. Oswald

  • 398 Want to read
  • 12 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC], [Springfield, Va .
Written in English

    Subjects:
  • Aircraft noise.,
  • Design analysis.,
  • Dynamic loads.,
  • Gear teeth.,
  • Gears.,
  • Mechanical engineering.,
  • Performance tests.,
  • Strain gages.,
  • Transmissions (Machine elements)

  • Edition Notes

    StatementFred B. Oswald and Dennis P. Townsend.
    SeriesNASA technical memorandum -- 106952., Army Research Laboratory technical report -- ARL-TR-778.
    ContributionsTownsend, Dennis P., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15414414M

    And a corresponding program is developed, which is the main tool for the gear tooth profile modification design, and practical calculation has carried out. Experimental Study of the Influence of Tooth Profile Modifications on Spur Gear Dynamic Strain and Vibration. By providing tip relief profile modification this TE can be decreased. Using MATLAB for computation and ANSYS for the simulation of deformation, stress, strain, life, and factor of safety results for the gear assemblies are obtained. Deformation results are used for the computation change in power transmission efficiency followed by the modal.

    The following animation simulates generation of one tooth of a tooth, profile shift gear, and duplicates the relative motion of the cutting rack with respect to the gear blank whilst holding the blank stationary to better illustrate formation of the tooth flank and fillet. The animation shows how the cutter shaves a portion of the tooth during each reciprocation, only a few of which are. EFFECT OF TOOTH PROFILE MODIFICATION ON LUBRICATION PERFORMANCE OF SPUR GEAR PAIRS ABSTRACT Tooth profile modification is a familiar method to improve load capacity and avoid tooth failures, however, the lubrication performance of a meshing gear pair surfaces would be affected due to the change of gear micro-geometry.

    Safety of Spur Gear Design Under Non-Ideal Conditions With Uncertainty, ASME , IDETC/CIE 3. S. Sankar, M. Sundar Raj, M. Nataraj Profile Modification for Increasing the Tooth Strength in Spur Gear Using CAD, , ISSN: 4. Xiangfei ZHAO, Jie ZHANG, Hongqi LIU ò Increasing. modification can change on the height of the tooth of the spur gear. 2. Figure 1 The idea of longitudinal tooth profile modification. The tooth face is rounded at the whole. Presented tooth shape may be obtained during machining on CNC machine tools. Developed computer program [6] gives support for CNC machine tool code by: 1.


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Influence of tooth profile modification on spur gear dynamic tooth strain by Fred B. Oswald Download PDF EPUB FB2

Examine the influence of tooth profile modification on dynamic tooth strain by means of controlled tests and to provide a database for further research. Data pre­ sented here include involute (tooth profile) charts for the test gears and time domain plots of static and dy­ namic gear tooth bending strain.

Results presented include static and dynamic measurements of gear tooth strain taken over a matrix of operating conditions.

The results demonstrate that a well-designed tooth profile modification can significantly reduce dynamic loads in spur gears, especially for gears which operate at high speed and under high by: Influence of tooth profile modification on spur gear dynamic tooth strain.

Fred Oswald and Bending strength model for internal spur gear teeth. Get this from a library. Influence of tooth profile modification on spur gear dynamic tooth strain. [Oswald Fred B.; Dennis P Townsend; United States. National Aeronautics and Space Administration.]. Oswald, F. B., Townsend, D.

P., Influence of tooth profile modification on spur gear dynamic tooth strain, NASA, TM, MAAG GEAR BOOK – Calculation and practice of gear drives, toothed couplings and synchronous clutch couplings, Cited by: Experimental result shows that strain occurring on the modified tooth profile gears is lower than on standard tooth profile until 50%, and this occurs on the tooth profile modification of the.

Dynamic Fracture Toughness Testing for Welding Part of Nuclear Piping Using Normalization Data Reduction Technique p Experimental Study of the Influence of Tooth Profile Modifications on Spur Gear Dynamic Strain and VibrationCited by: 4.

A new gear tooth modification model of planetary gear system was established by considering the characteristics of tooth longitudinal crowning modification and tooth profile modification. Using this model, the influences of modification parameters on the time-varying mesh stiffness, transmission error, contact spots and dynamic response of the planetary gear system were Cited by: 1.

design desk. Gear vibration can be reduced by profile modification is one of the way, specifically in the root of the gear. In this work, the tooth depth is increased to identify the reduction of vibration in a spur gear.

A two tooth model has been generated, discretized and analysed by FEA software. This paper deals with the effects of linear tip profile modification on the stress of tooth root and tooth flank of involute spur gears. An increase in the tooth flank stress due to the tip. In addition, the optimal profile modification required to minimize the dynamic load (hence the contact stress) on a gear tooth differs from the optimal modification required to minimize the dynamic root (bending) stress.

Computer simulation can help find the design tradeoffs to determine the best profile modification to satisfy the conflicting Cited by: This work studies the effects of tooth profile modification on multimesh gearset vibration.

The nonlinear analytical model considers the dynamic load distribution between the individual gear teeth and the influence of variable mesh stiffnesses, profile modifications, and contact loss.

The proposed model yields better agreement than two existing models when compared against nonlinear gear dynamics Cited by: [5] Oswald, Townsend, Influence of Tooth Profile Modification on Spur Gear Dynamic Tooth Strain, NASA Technical Memorandum [6] Kissling, Raabe, Calculating Tooth Form Transmission Error, Gear Solutions, September [7] KISSsoft   The effects of the shape of tooth profile modifications on the transmission error, bending, and contact stress of spur gears Show all authors.

Influence of tooth profile modification on spur gear dynamic tooth strain, NASA, TM, Cited by: Dynamic analysis of spur gear teeth Fig. Transient response for moving load with different speeds. the load moves down the profile of the active tooth.

However, in the root zone the effect of loading is also felt in the adjacent teeth. REFERENCES 1. Ramamurti and L. Gupta, Dynamic stress analysis of spur gear by: PROFILE MODIFICATION IN SPUR GEAR TOOTH Geometrical Modeling Figure shows the geometry of spur gear tooth with circular root fillet in which point ‘O’ is the center of the gear, ‘Oy’ is the axis of symmetry of the tooth and ‘B’ is the point where the involute profile File Size: KB.

Cai, Y. and Hayashi, T., “ Optimum Modification of Tooth Profile for a Pair of Spur Gears to Make its Rotational Vibration Equal Zero. In: Proceedings of the International Power Transmission and Gearing Conference,” ASME, Scottsdale Cited by: 9.

show that tooth profile modification for involute spur gear does not affect bending and contact stresses. The process can also effectively improve the stability of transmission. The impact and noise of gear pair with tooth profile modification significantly decreased during meshing.

The proposed method exhibits stronger adaptability compared Cited by: 1. This paper first proposed the concept of thermal stiffness of gears and then calculated thermal stiffness using the finite element method and the analytical method, respectively.

After that, based on the thermal stiffness, the thermal tooth profile modification of gears was studied. The results showed that the meshing thermal stiffness of tooth pair under the thermo-elastic coupling is a Author: Biao Luo, Wei Li, Chunming Fu, Linsheng Li, Xinxin Zhang.

Gear tooth profile modification can be done by increasing the tooth depth which influences much in reducing the gear vibra- tion at medium frequency range. Hence it is concluded that the influence of the tooth depth is a considerable parameter in vibration analysis of a gear.

Fig. 3 shows the static tooth root strain for the tooth gear pair at N-m torque with the 25° pressure angle tooth side in contact on the drive (Fig.

3 (a)) and coast (Fig. 3 (b)) sides. Fig. 4 shows the static strain on the drive side for the tooth gear pair at N-m torque. The solid red and dashed blue lines denote the experiments and finite element calculations, by: active profile roll angle (EAP) for each gear.

Profile Modification Gear tooth modification is a way to fight against not conjugated contact in real gear world. Not conjugated contact may be caused by different things. It can be spacing error, tooth profile, lead, and deflections under the load or misalignments in positioning of the Size: KB.Point-surface-origin (PSO) macropitting occurs at sites of geometric stress concentration (GSC) such as discontinuities in the gear tooth profile caused by micropitting, cusps at the intersection of the involute profile and the trochoidal root fillet, and at edges of prior tooth damage, such as tip-to .