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Author: National Aeronautics and Space Administration (NASA) Publisher: Createspace Independent Publishing Platform ISBN: 9781722128005 Category : Languages : en Pages : 24
Book Description
Contact stresses in meshing spur gear teeth are examined. The analysis is based upon an incremental finite element procedure that simultaneously determines the stresses in the contact region between the meshing teeth. The teeth themselves are modeled by two dimensional plain strain elements. Friction effects are included, with the friction forces assumed to obey Coulomb's law. The analysis assumes that the displacements are small and that the tooth materials are linearly elastic. The analysis procedure is validated by comparing its results with those for the classical two contacting semicylinders obtained from the Hertz method. Agreement is excellent. Hsieh, Chih-Ming and Huston, Ronald L. and Oswald, Fred B. Glenn Research Center NSG-3188; DA PROJ. 1L1-62211-A-47A...
Author: National Aeronautics and Space Administration (NASA) Publisher: Createspace Independent Publishing Platform ISBN: 9781722128005 Category : Languages : en Pages : 24
Book Description
Contact stresses in meshing spur gear teeth are examined. The analysis is based upon an incremental finite element procedure that simultaneously determines the stresses in the contact region between the meshing teeth. The teeth themselves are modeled by two dimensional plain strain elements. Friction effects are included, with the friction forces assumed to obey Coulomb's law. The analysis assumes that the displacements are small and that the tooth materials are linearly elastic. The analysis procedure is validated by comparing its results with those for the classical two contacting semicylinders obtained from the Hertz method. Agreement is excellent. Hsieh, Chih-Ming and Huston, Ronald L. and Oswald, Fred B. Glenn Research Center NSG-3188; DA PROJ. 1L1-62211-A-47A...
Author: National Aeronautics and Space Administration NASA Publisher: ISBN: 9781729135778 Category : Languages : en Pages : 28
Book Description
A numerical procedure for evaluating and monitoring contact stresses in meshing gear teeth is discussed. The procedure is intended to extend the range of applicability and to improve the accuracy of gear contact stress analysis. The procedure is based upon fundamental solution from the theory of elasticity. It is an iterative numerical procedure. The method is believed to have distinct advantages over the classical Hertz method, the finite-element method, and over existing approaches with the boundary element method. Unlike many classical contact stress analyses, friction effects and sliding are included. Slipping and sticking in the contact region are studied. Several examples are discussed. The results are in agreement with classical results. Applications are presented for spur gears. Somprakit, Paisan and Huston, Ronald L. Unspecified Center NSG-3188; DA PROJ. 1L1-62211-A-47-A; RTOP 505-63-36...
Author: National Aeronautics and Space Adm Nasa Publisher: Independently Published ISBN: 9781723748578 Category : Science Languages : en Pages : 30
Book Description
A procedure was developed to perform tooth contact analysis between a face gear meshing with a spur pinion using finite element analysis. The face gear surface points from a previous analysis were used to create a connected tooth solid model without gaps or overlaps. The face gear surface points were used to create a five tooth face gear Patran model (with rim) using Patran PCL commands. These commands were saved in a series of session files suitable for Patran input. A four tooth spur gear that meshes with the face gear was designed and constructed with Patran PCL commands. These commands were also saved in a session files suitable for Patran input. The orientation of the spur gear required for meshing with the face gear was determined. The required rotations and translations are described and built into the session file for the spur gear. The Abaqus commands for three-dimensional meshing were determined and verified for a simplified model containing one spur tooth and one face gear tooth. The boundary conditions, loads, and weak spring constraints were determined to make the simplified model work. The load steps and load increments to establish contact and obtain a realistic load was determined for the simplified two tooth model. Contact patterns give some insight into required mesh density. Building the two gears in two different local coordinate systems and rotating the local coordinate systems was verified as an easy way to roll the gearset through mesh. Due to limitation of swap space, disk space and time constraints of the summer period, the larger model was not completed.Bibel, George and Lewicki, David G. (Technical Monitor)Glenn Research CenterROTATION; GEAR TEETH; BOUNDARY CONDITIONS; FINITE ELEMENT METHOD; TIME; COMPUTER PROGRAMS; LOADS (FORCES)
Author: Jitendra Kumar Katiyar Publisher: CRC Press ISBN: 1000778428 Category : Technology & Engineering Languages : en Pages : 337
Book Description
Covering energy-saving technologies and how these are incorporated into component design, this book is relevant to many industries, including automotive engineering, and discusses the topical issue of sustainability in industry. This book details recent fundamental developments in the field of tribology in industrial systems. Tribology has advanced significantly in recent years. Tribological performance depends on external parameters such as contact pressure at the interface, system temperature, relative speed between bodies and contact behaviour. Through ensuring that mechanisms work in an energy-efficient manner and minimizing wear, engineers should seek to implement the study of tribology to improve the life of machinery within industry. Essential to the study of component design and condition monitoring, the book touches upon topics such as gears, bearings and clutches. Additionally, it discusses tribology’s relation to Industry 4.0 and incorporates the results from cutting-edge research. Industrial Tribology: Sustainable Machinery and Industry 4.0 will be of interest to all engineers working in industry and involved in mechanical engineering, material engineering, mechanisms and component design and automotive engineering.
Author: Jitendra Kumar Katiyar Publisher: Springer Nature ISBN: 3030474518 Category : Technology & Engineering Languages : en Pages : 306
Book Description
This book broadens the knowledge of tribology. This book is evolved out of current research trends on tribological performance of systems related to nano tribology, rheology, engines, polymer brushes, composite materials, erosive wear and lubrication. The book deals with enhancing the ideas on tribological properties, the different types of wear phenomenon and lubrication enhancement. Further, the tribological performance of systems, whether nano, micro or macro-scale, depends upon a large number of external parameters and important among them are temperature, contact pressure and relative speed. Thus, the book focus on the theoretical aspects to industrial applications of tribology.
Author: National Aeronautics and Space Administration (NASA)
Author: National Aeronautics and Space Administration (NASA)
Author: 
Author: Chih-Ming Hsieh
Author: National Aeronautics and Space Administration NASA
Author: National Aeronautics and Space Adm Nasa
Author: 
Author: Jitendra Kumar Katiyar
Author: Jitendra Kumar Katiyar
Author: 
Author: J. M. Thomson