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Dynamics Of Early Planetary Gear Trains

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Dynamics Of Early Planetary Gear Trains

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Author :
language : en
Publisher:
Release Date : 1984

Dynamics Of Early Planetary Gear Trains written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with categories.

A method to analyze the static and dynamic loads in a planetary gear train was developed. A variable-variable mesh stiffness (VVMS) model was used to simulate the external and internal spur gear mesh behavior, and an equivalent conventional gear train concept was adapted for the dynamic studies. The analysis can be applied either involute or noninvolute spur gearing. By utilizing the equivalent gear train concept, the developed method may be extended for use for all types of epicyclic gearing. The method is incorporated into a computer program so that the static and dynamic behavior of individual components can be examined. Items considered in the analysis are: (1) static and dynamic load sharing among the planets; (2) floating or fixed Sun gear; (3) actual tooth geometry, including errors and modifications; (4) positioning errors of the planet gears; (5) torque variations due to noninvolute gear action. A mathematical model comprised of power source, load, and planetary transmission is used to determine the instantaneous loads to which the components are subjected. It considers fluctuating output torque, elastic behavior in the system, and loss of contact between gear teeth. The dynamic model has nine degrees of freedom resulting in a set of simultaneous second order differential equations with time varying coefficients, which are solved numerically. The computer program was used to determine the effect of manufacturing errors, damping and component stiffness, and transmitted load on dynamic behavior. It is indicated that this methodology offers the designer/analyst a comprehensive tool with which planetary drives may be quickly and effectively evaluated.

Dynamics Of Planetary Gear Trains

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Author :
language : en
Publisher:
Release Date : 1984

Dynamics Of Planetary Gear Trains written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Gearing, Planetary categories.

Dynamics Of Planetary Gear Trains

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Author : Richard August
language : en
Publisher:
Release Date : 1983

Dynamics Of Planetary Gear Trains written by Richard August and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Gearing, Planetary categories.

Planetary Gear Trains

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Author : Kiril Arnaudov
language : en
Publisher: CRC Press
Release Date : 2019-03-27

Planetary Gear Trains written by Kiril Arnaudov and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-03-27 with Technology & Engineering categories.

This book provides comprehensive information for various planetary gear trains, with practical applications and comprehensive references to technical articles. In the text's chapters, readers can find all the information needed for various types of gear trains, with illustrations and examples. The authors help gear designers to creatively understand the design of gears, as well as master the mechanical calculations needed. Planetary Gear Trains is the most comprehensive and up-to-date work available in this key technical area. The book reflects not only teaching, but also the practical experience of the authors. It was developed under the motto "From practice to practice".

Nasa Technical Paper

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Author :
language : en
Publisher:
Release Date : 1989

Nasa Technical Paper written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Astronautics categories.

Nonlinear Random Vibration Of Planetary Gear Trains With Elastic Ring Gear

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Author : Jalal Taheri Kahnamouei
language : en
Publisher:
Release Date : 2020

Nonlinear Random Vibration Of Planetary Gear Trains With Elastic Ring Gear written by Jalal Taheri Kahnamouei and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.

Planetary gear trains (PGT) are widely used in the field of renewable energy, especially in wind turbines. A wind turbine uses planetary gearboxes to transfer wind torque to a generator, and even though gearboxes are designed according to sound engineering practices, they fail much sooner than their design life estimates. Unexpected PGT failures are costly, and it is vital to detect these failures early. This thesis proposes proper methods and analyses that help the wind turbine industry to prevent future failure by enlightening the nonlinear dynamic behavior of PGT under random force. This thesis will investigate one of the main factors in PGT failure: random vibration caused by wind turbulence. In this thesis, a hybrid dynamic model was proposed to model the stochastic nonlinear dynamics of a PGT with an elastic ring gear, and then the statistical linearization method (SL) was introduced to linearize the model. A new criterion of the SL is introduced to linearize the stochastic nonlinear dynamic model of a gear pair. The stochastic response of a thin-walled ring gear PGT under three equally-spaced random moving loads was also investigated. A series of parametric studies was conducted, and the obtained results revealed that the proposed model for the PGT accurately represented the dynamic behavior of the PGT with an elastic ring gear, and the SL gave acceptable accuracy. Also, the energy-based SL was enough accurate and valid to apply to stochastic nonlinear gear pairs under heavy load conditions, and the accuracy of the SL decreased for light load conditions. Finally, analysis on the effect of random moving loads on the ring gear showed that the mean of displacement was affected by the critical speeds, and random loads' speed does not influence the standard deviation of displacement. Monte Carlo simulations (MCS) were conducted to verify the proposed model and method, and MCS proved the accuracy of the proposed model and process.

Dynamic Analysis And Control System Design Of Automatic Transmissions

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Author : Joel M Maguire
language : en
Publisher: SAE International
Release Date : 2013-02-12

Dynamic Analysis And Control System Design Of Automatic Transmissions written by Joel M Maguire and has been published by SAE International this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-02-12 with Technology & Engineering categories.

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.