Using Dynamic Analysis For Compact Gear Design

Author :
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.08/5 ( download)

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Download or read book Using Dynamic Analysis for Compact Gear Design written by and published by . This book was released on 1998 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper presents procedures for designing compact spur gear sets with the objective of minimizing the gear size. The allowable tooth stress and dynamic response are incorporated in the process to obtain a feasible design region. Various dynamic rating factors were investigated and evaluated. The constraints of contact stress limits and involute interference combined with the tooth bending strength provide the main criteria for this investigation. A three-dimensional design space involving the gear size, diametral pitch, and operating speed was developed to illustrate the optimal design of spur gear pairs. The study performed here indicates that as gears operate over a range of speeds, variations in the dynamic response change the required gear size in a trend that parallels the dynamic factor. The dynamic factors are strongly affected by the system natural frequencies. The peak values of the dynamic factor within the operating speed range significantly influence the optimal gear designs. The refined dynamic factor introduced in this study yields more compact designs than AGMA dynamic factors.

Author : United States. National Aeronautics and Space Administration
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.76/5 ( download)

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Download or read book USING DYNAMIC ANALYSIS FOR COMPACT GEAR DESIGN... NASA/TM-1998-207419... JAN. 20, 1999 written by United States. National Aeronautics and Space Administration and published by . This book was released on 1999* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : Sean Gauntt
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.25/5 ( download)

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Download or read book Dynamic Analysis of Aerospace Gearboxes Featuring Hybrid Steel-Composite Gears written by Sean Gauntt and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to reduce the weight of rotorcraft drivetrains, which typically account for 10%-15% of the vehicle weight, the concept of hybrid gears featuring composite bodies coupled with an outer rim of steel gear teeth has previously been introduced. Initial concept assessments on small-scale spur gears showed promise, with an unoptimized design reducing gear weight by almost 15%. The research outlined in this dissertation was conducted to assess whether hybrid gears could be designed for realistic-scale applications that significantly reduce weight without having a deleterious effect on vibration performance. From the results, it appears that hybrid gears will be able to reduce weight by 15%-45% without negatively affecting vibration performance for low and medium speed applications, as hybrid gear models predict similar performance to their all-steel counterparts. At higher speeds, drivetrains featuring hybrid gears are predicted to have significantly different dynamic response than ones with all-steel gears (as much as a 250% change in dynamic transmission error), but whether this difference is an improvement is design and speed-dependent. Therefore, careful design is necessary for high-speed hybrid gears. Initial studies were conducted on small-scale hybrid spur gears. A finite element model of a hybrid spur gear featuring a hexagonal interlock at the composite-steel interface was developed and validated with previous models and experimental results. An optimization technique was then developed to determine optimal designs for a hybrid spur gear with a sinusoidal interlock and integral composite shaft. This was initially done on a hybrid gear blank to minimize gear mass and shear tractions at the composite-steel interface. The optimization technique was then refined to include effects of tooth bending with a third objective, to minimize gear tooth deflections at the pitch point. Finite element models of the optimized design candidates were then incorporated into a system-level drivetrain model for static and dynamic transmission error prediction. Gear tooth profile modifications were optimized and decreased peak-to-peak transmission error by as much as 25%. Finally, the fully optimized design candidates were used to compare static and dynamic transmission error predictions of hybrid gears to a baseline steel gear. The optimization technique and drivetrain modeling were then applied to a large-scale hybrid spur gear, which is more representative of gears used in rotorcraft drive systems.

Author : Joel M Maguire
Publisher : SAE International
ISBN 13 : 0768079322
Total Pages : 218 pages
Book Rating : 4.26/5 ( download)

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Download or read book Dynamic Analysis and Control System Design of Automatic Transmissions written by Joel M Maguire and published by SAE International. This book was released on 2013-02-12 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: While the basic working principle and the mechanical construction of automatic transmissions has not changed significantly, increased requirements for performance, fuel economy, and drivability, as well as the increasing number of gears has made it more challenging to design the systems that control modern automatic transmissions. New types of transmissions—continuously variable transmissions (CVT), dual clutch transmissions (DCT), and hybrid powertrains—have presented added challenges. Gear shifting in today’s automatic transmissions is a dynamic process that involves synchronized torque transfer from one clutch to another, smooth engine speed change, engine torque management, and minimization of output torque disturbance. Dynamic analysis helps to understand gear shifting mechanics and supports creation of the best design for gear shift control systems in passenger cars, trucks, buses, and commercial vehicles. Based on the authors’ graduate-level teaching material, this well-illustrated book relays how the fundamental principles of hydraulics and control systems are applied to today’s automatic transmissions. It opens with coverage of basic automatic transmission mechanics and then details dynamics and controls associated with modern automatic transmissions. Topics covered include: gear shifting mechanics and controls, dynamic models of planetary automatic transmissions, design of hydraulic control systems, learning algorithms for achieving consistent shift quality, torque converter clutch controls, centrifugal pendulum vibration absorbers, friction launch controls, shift scheduling and integrated powertrain controls, continuously variable transmission ratio controls, dual-clutch transmission controls, and more. The book includes many equations and clearly explained examples. Sample Simulink models of various transmission mechanical, hydraulic and control subsystems are also provided. Chapter Two, which covers planetary gear automatic transmissions, includes homework questions, making it ideal for classroom use. In addition to students, new engineers will find the book helpful because it provides the basics of transmission dynamics and control. More experienced engineers will appreciate the theoretical discussions that will help elevate the reader’s knowledge. Although many automatic transmission-related books have been published, most focus on mechanical construction, operation principles, and control hardware. None tie the dynamic analysis, control system design, and analytic investigation of the mechanical, hydraulic, and electronic controls as does this book.

Author :
Publisher : Universal-Publishers
ISBN 13 : 1612336248
Total Pages : 500 pages
Book Rating : 4.44/5 ( download)

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Download or read book Proceedings of First International Conference on Emerging Trends in Mechanical Engineering written by and published by Universal-Publishers. This book was released on with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : Mehmet Kubur
Publisher :
ISBN 13 :
Total Pages : 130 pages
Book Rating : 4.99/5 ( download)

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Download or read book Dynamic Analysis of a Multi-shaft Helical Gear Transmission by Finite Elements written by Mehmet Kubur and published by . This book was released on 2002 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : United States. Superintendent of Documents
Publisher :
ISBN 13 :
Total Pages : 1066 pages
Book Rating : 4.2Q/5 ( download)

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Download or read book Monthly Catalog of United States Government Publications written by United States. Superintendent of Documents and published by . This book was released on 1994 with total page 1066 pages. Available in PDF, EPUB and Kindle. Book excerpt: February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index

Author :
Publisher :
ISBN 13 :
Total Pages : 284 pages
Book Rating : 4.81/5 ( download)

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Download or read book Computer Program Abstracts written by and published by . This book was released on 1975 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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Publisher :
ISBN 13 :
Total Pages : 1102 pages
Book Rating : 4.02/5 ( download)

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Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 1102 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : Kuang-Hua Chang
Publisher : SDC Publications
ISBN 13 : 1585035955
Total Pages : 136 pages
Book Rating : 4.53/5 ( download)

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Download or read book Motion Simulation and Mechanism Design with SolidWorks Motion 2009 written by Kuang-Hua Chang and published by SDC Publications. This book was released on 2009-03 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Motion Simulation and Mechanism Design with SolidWorks Motion 2009 is written to help you become familiar with SolidWorks Motion, an add-on module of the SolidWorks software family. This book covers the basic concepts and frequently used commands required to advance readers from a novice to intermediate level in using SolidWorks Motion. SolidWorks Motion allows you to use solid models created in SolidWorks to simulate and visualize mechanism motion and performance. Using SolidWorks Motion early in the product development stage could prevent costly redesign due to design defects found in the physical testing phase. Therefore, using SolidWorks Motion contributes to a more cost effective, reliable, and efficient product design process. Basic concepts discussed in this book include model generation, such as creating assembly mates for proper motion; carrying out simulation and animation; and visualizing simulation results, such as graphs and spreadsheet data. These concepts are introduced using simple, yet realistic examples. Verifying the results obtained from the computer simulation is extremely important. One of the unique features of this book is the incorporation of theoretical discussions for kinematic and dynamic analyses in conjunction with the simulation results obtained using SolidWorks Motion. Verifying the simulation results will increase your confidence in using the software and prevent you from being fooled by erroneous simulations.