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Author: Huali Ding Publisher: 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.
Author: Huali Ding Publisher: 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.
Author: Joel M Maguire Publisher: SAE International ISBN: 0768076048 Category : Transportation Languages : en Pages : 218
Book Description
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: Herbert Ho-Ching Iu Publisher: 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.
Author: Publisher: ISBN: Category : Aircraft Languages : en Pages : 86
Book Description
The ability to accurately predict the dynamic response of an aircraft while it is operating in the taxi mode depends, in part on the correct modeling of the dynamic characteristics of the landing gear system. Traditionally, landing gear have been designed to absorb landing impact ('shock absorber') and their characteristics during periodic, oscillatory response ('spring') have been considered as secondary. With the increased emphasis on the rough or damaged field taxi operation, there is a requirement to determine the best methods for modeling the gear system. This report documents a brief review of the state of the art of gear modeling. A study was then conducted to evaluate important model parameters, using a simple cantilevered gear computer simulation. Also included is the development of a technique for the experimental determination of important gear system parameters. (Author).
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: Publisher: ISBN: Category : Languages : en Pages : 30
Book Description
Modification of geometry of spur and helical gears with parallel axes and helical gears with crossed axes is proposed. The finishing process of gear generation is shaving. The purposes of modification of the gear geometry are to localize and stabilize the bearing contact, and to reduce noise and vibration. The goals mentioned above are achieved by using profile crowning and plunging the shaver by a prescribed motion during pinion generation. The pinion becomes double crowned. The gear member is generated as a conventional involute gear. A tooth contact analysis (TCA) program for simulation of meshing and contact was developed and the analysis is illustrated with TCA results for spur and helical gears.
Author: Jocelyn I. Pritchard Publisher: ISBN: Category : Aerodynamics Languages : en Pages : 22
Book Description
On of the problems facing the aircraft community is landing gear dynamics, especially shimmy and brake-induced vibration. Shimmy and brake-induced vibrations can lead to accidents due to excessive wear and shortened life of gear parts and contribute to pilot and passenger discomfort. To increase understanding of these problems, a literature survey was performed. The major focus is on work from the last ten years. Some older publications are included to understand the longevity of the problem and the background from earlier researchers. The literature survey includes analyses, testing, modeling, and simulation of aircraft landing gear; and experimental validation and characterization of shimmy and brake-induced vibration of aircraft landing gear. The paper presents an overview of the problem, background information, and a history of landing gear dynamics problems and solutions. Based on the survey an assessment and recommendations of the most critically needed enhancements to the state of the art will be presented. The status of Langley work contributing to this activity will be given.
Author: Andrew Ball Publisher: Springer Nature ISBN: 3030577457 Category : Technology & Engineering Languages : en Pages : 1566
Book Description
This book gathers select contributions from the 32nd International Congress and Exhibition on Condition Monitoring and Diagnostic Engineering Management (COMADEM 2019), held at the University of Huddersfield, UK in September 2019, and jointly organized by the University of Huddersfield and COMADEM International. The aim of the Congress was to promote awareness of the rapidly emerging interdisciplinary areas of condition monitoring and diagnostic engineering management. The contents discuss the latest tools and techniques in the multidisciplinary field of performance monitoring, root cause failure modes analysis, failure diagnosis, prognosis, and proactive management of industrial systems. There is a special focus on digitally enabled asset management and covers several topics such as condition monitoring, maintenance, structural health monitoring, non-destructive testing and other allied areas. Bringing together expert contributions from academia and industry, this book will be a valuable resource for those interested in latest condition monitoring and asset management techniques.
Author: H.Y. Hu Publisher: Springer Science & Business Media ISBN: 1402063318 Category : Science Languages : en Pages : 421
Book Description
This is a state-of-the-art treatise on the problems of both nonlinearity and uncertainty in the dynamics and control of engineering systems. The concept of dynamics and control implies the combination of dynamic analysis and control synthesis. It is essential to gain insight into the dynamics of a nonlinear system with uncertainty if any new control strategy is designed to utilize nonlinearity.
Author: Fakher Chaari Publisher: Springer Science & Business Media ISBN: 3319041878 Category : Technology & Engineering Languages : en Pages : 189
Book Description
In the last decade the research in signal analysis was dominated by models that encompass nonstationarity as an important feature. This book presents the results of a workshop held in Grodek—Poland in February 2013 which was dedicated to the investigation of cyclostationary signals. Its main objective is to highlight the strong interactions between theory and applications of cyclostationary signals with the use of modern statistical tools. An important application of cyclostationary signals is the analysis of mechanical signals generated by a vibrating mechanism. Cyclostationary models are very important to perform basic operations on signals in both time and frequency domains. One of the fundamental problems in diagnosis of rotating machine is the identification of significant modulating frequencies that contribute to the cyclostationary nature of the signals. The book shows that there are modern tools available for analyzing cyclostationary signals without the assumption of gaussianity. Those methods are based on the ideas of bootstrap, subsampling and Fraction-of-time (FOT) models. The book is organised in two parts. The first part will be dedicated to pure theory on cyclostationarity. Applications are presented in the second part including several mechanical systems such as bearings, gears, with or without damages.
Author: Huali Ding
Author: Huali Ding
Author: Joel M Maguire
Author: Herbert Ho-Ching Iu
Author: 
Author: Jitendra Kumar Katiyar
Author: 
Author: Jocelyn I. Pritchard
Author: Andrew Ball
Author: H.Y. Hu
Author: Fakher Chaari