Dynamics Of Planetary Gear Trains
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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 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 : 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".
Vibration And Noise Reduction In Planetary Gear Train By Phasing
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Author : Ashutosh Mokate
language : en
Publisher: Anchor Academic Publishing
Release Date : 2016-07
Vibration And Noise Reduction In Planetary Gear Train By Phasing written by Ashutosh Mokate and has been published by Anchor Academic Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-07 with Technology & Engineering categories.
Gears are essential parts of many precision power transmitting machines such as automobiles. The major functions of a gearbox are to transform speed and torque in a given ratio and to change the axis of rotation. Planetary gears yield several advantages over conventional parallel shaft gear systems: They produce high speed reductions in compact spaces, a greater load sharing, a higher torque to weight ratio, diminished bearing loads, and reduced noise and vibration. They are used in automobiles, helicopters, aircraft engines, heavy machinery, and a variety of other applications. Despite their advantages, the noise induced by the vibration of planetary gear systems remains a key concern. Planetary gears have received considerably less research attention than single mesh gear pairs. There is a particular scarcity of analysis of two planetary gear systems and their dynamic response. Hence, this book focuses on the study of two PGTs with different phasing (angular positions) while every individual set remains unchanged.
Gear Mesh Stiffness And Dynamic Response Of Spur Gear Planetary Gear Trains
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Author : John K. Abraham
language : en
Publisher:
Release Date : 1995
Gear Mesh Stiffness And Dynamic Response Of Spur Gear Planetary Gear Trains written by John K. Abraham and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Gearing, Spur categories.
Multi Body And Nonlinear Dynamics Of Planetary Gear Drivetrains Considering Bearing Clearance And Acoustics
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Author : Yi Guo
language : en
Publisher:
Release Date : 2011
Multi Body And Nonlinear Dynamics Of Planetary Gear Drivetrains Considering Bearing Clearance And Acoustics written by Yi Guo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Bearing clearance in planetary gears introduces nonlinear behaviors and bifurcations, which have not been investigated in the past. In Chapter 3, numerical integration and harmonic balance are applied to the analytical model, while Newmark method is used for the finite element model. Floquet theory determines solution stability. Complicated nonlinear effects, coexisting solutions, bifurcations, and chaos are exhibited in the dynamic response. Input torque can potentially eliminate some of the nonlinear effects caused by bearing clearance.
Dynamics And Vibration Analyses Of Gearbox In Wind Turbine
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Author : Qingkai Han
language : en
Publisher: Springer
Release Date : 2016-09-27
Dynamics And Vibration Analyses Of Gearbox In Wind Turbine written by Qingkai Han and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-09-27 with Technology & Engineering categories.
This book explores the dynamics and vibration properties of gearboxes, with a focus on geared rotor systems. It discusses mechanical theories, finite-element based simulations, experimental measurements and vibration signal processing techniques. It introduces the vibration-resonance calculation method for the geared rotor system in wind turbines and load sharing of the planetary gear train, and offers a method for calculating the vibrations of geared rotor systems under either internal excitations from gear sets or external loads transferred from wind loads. It also defines and elaborates on parameter optimization for planetary gear systems based on the torsional dynamics of wind-turbine geared rotor systems. Moreover, it describes experimental measurements of vibrations on the wind-turbine gearbox performed on the test rig and on site, and analyzes the vibration signals of different testing points, showing them in both time and frequency domains. Lastly, it lists the gear coupling frequencies and fault characteristic frequencies from the vibrations of the gearbox housing. The technologies and results presented are valuable resources for use in dynamic design, vibration prediction and analysis of gearboxes and geared rotor systems in wind turbines as well as many other machines.
Reliability Model For Planetary Gear Trains
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Author : Michael Savage
language : en
Publisher:
Release Date : 1982
Reliability Model For Planetary Gear Trains written by Michael Savage and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with categories.
A reliability model is presented for planetary gear trains in which the ring gear is fixed, the sun gear is the input, and the planet arm is the output. The input and output shafts are co-axial and the input and output torques are assumed to be co-axial with these shafts. Thrust and side loading are neglected. This type of gear train is commonly used in main rotor transmissions for helicopters and in other applications which require high reductions in speed. The reliability model is based on the Weibull distribution of the individual reliabilities of the transmission components. The transmission's basic dynamic capacity is defined as the input torque which may be applied for one-million input rotations of the sun gear. Load and life are related by a power law. The load-life exponent and basic dynamic capacity are developed as functions of the component capacities. (Author).
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.