Author: Can YukselPublisher:
ISBN:
Category : Gearing
Languages : en
Pages : 180
Book Description
Influence of Tooth Profile Wear on Dynamic Tooth Loads of a Planetary Gear Set
Author: Can YukselInfluence of Tooth Profile Modification on Spur Gear Dynamic Tooth Strain
Author: Fred B. OswaldDynamic Wear Models for Gear Systems
Author: Huali DingPublisher:
ISBN:
Category : Gearing
Languages : en
Pages : 217
Book Description
Abstract: In this study, a family of dynamic models of gear systems were incorporated with a wear formulation to predict the interactions between the dynamic behavior and tooth surface wear. First, dynamic response of a spur gear pair was predicted by using a finite elements-based deformable-body model and a simplified discrete model. These validated dynamic models were then combined with a surface wear model to study the interaction between gear surface wear and gear dynamic response. The predictions of the dynamic gear wear model demonstrated a considerable influence of worn surface profiles on dynamic tooth forces as well as a significant influence of dynamic tooth forces on wear profiles. A set of actual spur gear wear experiments was performed to generate experimental wear profiles that were shown to agree well with the predictions of the spur gear dynamic wear model. Next, the same dynamic wear methodology was applied to helical gears, by replacing the torsional nonlinear spur gear wear model with a three-dimensional linear model. Surface wear was shown to influence the dynamic response of a helical gear pair substantially, including the natural frequencies and forced response harmonic amplitudes. Consequences of dynamic behavior on wear outcome from a helical gear pair were less prominent when compared to spur gears. Finally, suitability of these gear pair dynamic wear models to a multi-mesh gear system was established by considering a single stage n-planet planetary gear set. The predictions indicated that the wear depths at the both internal and external meshes are significant and hence must be included in the simulations simultaneously. As in single gear pairs, surface wear was shown to impact the harmonic amplitudes of the dynamic response parameters, at the same time influencing the nonlinear behavior as well. Dynamic loads were also shown to affect the wear profiles at all meshes of a planetary gear set significantly. Higher wear amplitudes were predicted in the resonance region due to the increased dynamic mesh loads.
Dynamic Loads on Gear Teeth
Author: American Society of Mechanical Engineers. Special research committee on the strength of gear teethPublisher:
ISBN:
Category : Gearing
Languages : en
Pages : 82
Book Description
Influence of Tooth Spacing Error on Gears With and Without Profile Modifications
Author: Influence of Linear Profile Modification and Loading Conditions on the Dynamic Tooth Load and Stress of High Contact Ratio Gears
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 13
Book Description
This paper presents a computer simulation for the dynamic response of high-contact-ratio spur gear transmissions. High contact-ratio spur gear transmissions. High contact ratio gears have the potential to produce lower dynamic tooth loads and minimum root stress but they can be sensitive to tooth profile errors. The analysis presented in this paper examines various profile modifications under realistic loading conditions. The effect of these modifications on the dynamic load (force) between mating gear teeth and the dynamic root stress is presented. Since the contact stress is dependent on the dynamic load, minimizing dynamic loads will also minimize contact stresses. This paper shows that the combination of profile modification and the applied load (torque) carried by a gear system has a significant influence on gear dynamics. The ideal modification at one value of applied load will not be the best solution for a different load. High-contact-ratio gears were found to require less modification than standard low-contact-ratio gears.
VIBRATION AND NOISE REDUCTION IN PLANETARY GEAR TRAIN BY PHASING
Author: Ashutosh MokatePublisher: diplom.de
ISBN: 3960675186
Category : Technology & Engineering
Languages : en
Pages : 113
Book Description
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.
Dynamics and Fault Diagnosis of Nonlinear Rotors and Impellers
Author: Jiazhong ZhangPublisher: Springer Nature
ISBN: 3030943011
Category : Technology & Engineering
Languages : en
Pages : 281
Book Description
This contributed volume presents recent developments in nonlinear dynamics applied to engineering. Specifically, the authors address stability and bifurcation in large-scale, complex rotor dynamic systems; periodic motions and their bifurcations in nonlinear circuit systems, fault diagnosis of complex engineering systems with nonlinear approaches, singularities in fluid-machinery and bifurcation analysis, nonlinear behaviors in rotor dynamic system with multi-mistuned blades, mode localization induced by mistuning in impellers with periodical and cyclic symmetry, and nonlinear behaviors in fluid-structure interaction and their control. These new results will maximize reader understand on the recent progress in nonlinear dynamics applied to large-scale, engineering systems in general and nonlinear rotors and impellers in particular.
Dynamics of Planetary Gear Trains
Author: Control and Nonlinear Dynamics on Energy Conversion Systems
Author: Herbert Ho-Ching IuPublisher: MDPI
ISBN: 3039211102
Category : Technology & Engineering
Languages : en
Pages : 435
Book Description
The ever-increasing need for higher efficiency, smaller size, and lower cost make the analysis, understanding, and design of energy conversion systems extremely important, interesting, and even imperative. One of the most neglected features in the study of such systems is the effect of the inherent nonlinearities on the stability of the system. Due to these nonlinearities, these devices may exhibit undesirable and complex dynamics, which are the focus of many researchers. Even though a lot of research has taken place in this area during the last 20 years, it is still an active research topic for mainstream power engineers. This research has demonstrated that these systems can become unstable with a direct result in increased losses, extra subharmonics, and even uncontrollability/unobservability. The detailed study of these systems can help in the design of smaller, lighter, and less expensive converters that are particularly important in emerging areas of research like electric vehicles, smart grids, renewable energy sources, and others. The aim of this Special Issue is to cover control and nonlinear aspects of instabilities in different energy conversion systems: theoretical, analysis modelling, and practical solutions for such emerging applications. In this Special Issue, we present novel research works in different areas of the control and nonlinear dynamics of energy conversion systems.