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Author: Michael J. Drosjack Publisher: ISBN: Category : Languages : en Pages : 189
Book Description
This study was performed to investigate the dynamic effects encountered at the gear mesh as the result of gear tooth surface faults. For this purpose, a torsional dynamic simulation of a geared system was developed which included provisions to account for the effect of pitting on a gear tooth. Tests were performed with gears which were in good condition and with gears containing manufactured faults. Results of the experiments and simulation were compared, and substantial correlation was found between the two. Thus, the capability of the simulation to model a fault on a tooth was substantiated.
Author: Michael J. Drosjack Publisher: ISBN: Category : Languages : en Pages : 189
Book Description
This study was performed to investigate the dynamic effects encountered at the gear mesh as the result of gear tooth surface faults. For this purpose, a torsional dynamic simulation of a geared system was developed which included provisions to account for the effect of pitting on a gear tooth. Tests were performed with gears which were in good condition and with gears containing manufactured faults. Results of the experiments and simulation were compared, and substantial correlation was found between the two. Thus, the capability of the simulation to model a fault on a tooth was substantiated.
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: Shengli Zhang Publisher: ISBN: Category : Electronic dissertations Languages : en Pages :
Book Description
This study presents an effort in system level identification and gear dynamics analysis. The mechanical system usually includes several parts with different mechanisms to achieve a particular job. To simulate the motion of the parts, evaluate the performance, and analyze the vibration of the system, a system level modeling is needed. However, the modeling is challenging because of unknown parameters, nonlinearities, and uncertainties. System identification is one of the key techniques to obtain a reliable dynamic model by appropriately choosing the mathematical model, identifying the unknowns, and reducing the uncertainties. This study illustrates approaches and procedures in building system-level model for an electric impact wrench. Electric impact wrench, whose operation involves dynamic events occurring at vastly different time scales, is an important tool used in manufacturing and maintenance services where high torque is required. A first-principle-based, system-level model is built by incorporating the dynamics of gear transmission, spindle, and impacting components. The nonlinear impact and kinematic constraints are explicitly analyzed, and systematic parametric identification is performed based on a multi-objective optimization approach, i.e. archived multi-objective simulated annealing. The predictions from the model with system identification correlate well with the experimental results. In the system level modeling, it is found that gear transmission is one of the most popular and important sub-system whose dynamics and health conditions affect the system performance significantly. Therefore, this study also presents the effort in the gear dynamics analysis and fault diagnosis. It is well known that the nonlinear characteristics of the gearbox are mainly induced by time-varying mesh stiffness and backlash. To solve this nonlinear system, numeric method is usually employed whose time step has to be carefully controlled and the accuracy suffers from cumulative errors. To overcome the limitations of the numeric method, an approach, integrating Floquet theory with harmonic balance method, is proposed to analytically analyze the dynamics of the gearbox that subjects to parameter excitation and backlash nonlinearity. This approach can not only solve the steady-state system response, as traditional harmonic balance method, but also the transient response of the system. Case study verifies the accuracy of the proposed approach and its efficiency in calculating the frequency response of the system. The proposed method also accurately predicts the nonlinear jump of the gearbox. In the gear fault diagnosis, a fault signature enhancement method, i.e. angle-frequency domain synchronous averaging, is developed. This method is capable of highlighting the fault related features from the nonstationary and noisy vibration signal. Rather than being averaged in time-domain as traditional method, the vibration signal is averaged in angle-frequency domain after being resampled from time domain into angle domain and analyzed by the joint angle-frequency technique so as to solve the phase shift problem. The enhanced results are then analyzed through feature extraction algorithms, i.e. Kernel Principal Component Analysis, Multilinear Principal Component Analysis, and Locally Linear Embedding, to extract the most distinct features for fault classification and identification. Experimental study demonstrates that the proposed method significantly enhances the fault related features and improves the identification rate of support vector machine in identifying multi gear faults.
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: Michael J. Drosjack
Author: Michael J. Drosjack
Author: Michael J. Drosjack
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Author: Shengli Zhang
Author: 
Author: 
Author: 
Author: Mechanical Failures Prevention Group
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Author: Joel M Maguire