Download or read book An Experimental Technique for the Evaluation of Dynamic Mesh Stiffness and Pinion gear System Response to Sinusoidal Excitation written by Mark Cameron Benton and published by . This book was released on 1975 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of Mechanical Design written by and published by . This book was released on 1981 with total page 948 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optimal Design of Coupled Dynamic Systems with Time varying Stiffness written by Mark Cameron Benton and published by . This book was released on 1978 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ASME Technical Papers written by and published by . This book was released on 1977 with total page 908 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Non linear Dynamic Analysis of Geared Systems written by Rajendra Singh and published by . This book was released on 1990 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Investigation of the Dynamic Behavior of Systems with Noncircular Gears written by Ming-Jun Lai and published by . This book was released on 1996 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Study of Multi mesh Gear Dynamics written by Steven James Martisauskas and published by . This book was released on 2005 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: This thesis discusses a project to experimentally measure the dynamics of a multi- mesh gear system. Previous work on the design and testing of an idler gear system is detailed. Experimental results, specifically vibration modes of the test gearbox, correlate poorly with joint analytical modeling efforts. Limitations to the test setup, including high bearing drag and damping, result in questionable faith in experimental results. Disassembly of the test assembly results in anticipated damage to shaft and bearing components. Test gearbox components are repaired and modified, then re-assembled in a similar configuration. Results from testing on the newly modified gearbox are less limited by bearing drag and correlate well with previous results. The continued presence of high system damping leads to a critical analysis of modal extraction techniques. Agreement of experimental results between both assemblies of the test gearbox greatly increases faith in experimental results. Dynamic behavior including large amplitude parametric instabilities associated with mesh stiffness variation and nonlinear jump phenomena associated with tooth mesh contact loss are also experimentally demonstrated. Repeatability of this behavior is show to vary between various assemblies of the test gearbox.
Download or read book Nonlinear Time varying Gear Mesh and Dynamic Analysis of Hypoid and Bevel Geared Rotor Systems written by Jun Wang and published by . This book was released on 2007 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hypoid and bevel gear pairs are high-speed, precision right-angle power transmission devices that are widely used in automotive and aerospace applications. However, their dynamic response due to gear transmission error excitation tends to cause annoying gear whines. The unwanted high frequency whine noise is characteristically tonal and is the result of structural vibration at the gear mesh frequency. This vibratory response is believed to be strongly affected by the nonlinearity and time-variation inherent in the parameters of these types of non-parallel axis gears. To address this problem, the influence of nonlinear time-varying mesh must be understood more clearly. Hence, to address this issue, the goal of this dissertation is to formulate reliable gear dynamic models to analyze the underlying physics controlling the effects of nonlinear and time-varying mesh and dynamic characteristics on gear whine generation and transmissibility phenomena. In order to establish a basis for comparison to results of nonlinear time-varying formulation, a linear time-invariant (LTI) mesh model is formulated first by neglecting gear backlash nonlinearity. This simple form of mesh model is applied to a proposed fourteen degrees-of-freedom lumped parameter dynamic model. The linearized formulation is also employed to study the effects of assembly errors on gear mesh and dynamic responses as well as the effects of key design parameters on the critical out-of-phase gear pair torsion modes. From the parametric study, less sensitive design sets that attempt to achieve a balance between reducing dynamic mesh force and minimizing vibration transmissibility can be identified. To study the true effects of time-varying mesh parameters and backlash nonlinearity, a generalized nonlinear time-varying (NLTV) dynamic model of a bevel or hypoid gear pair is developed. In the proposed formulation, a new exact time-varying mesh model is proposed that can be easily incorporated into the dynamic models. This resulted in NLTV dynamic models of bevel or hypoid gear pair systems with time-dependent nonlinear mesh damping and backlash nonlinearity. The resultant theory is then applied to study the boundary between nonlinear jump phenomena and linear response. Also, the new NLTV dynamic model is further extended to study the effect of mesh stiffness asymmetry on dynamic response. Using this model, numerous single degree-of-freedom NLTV dynamic models with different nonlinearities are analyzed and their results are compared to better understand the primary controlling factors. The single degree-of-freedom NLTV dynamic model is finally extended to a fourteen degrees-of-freedom dynamic representation to investigate the influence of wider range of driveline parameters and system modes.
Download or read book Theoretical and Experimental Determination of the Dynamic Gear Meshing Stiffness written by Connie P. Marchek and published by . This book was released on 1995 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nonlinear Dynamics of Multi mesh Gear Systems written by Gang Liu and published by . This book was released on 2007 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Multi-mesh gear systems are used in a variety of industrial machinery, where noise, quality, and reliability lie in gear vibration. The dynamic gear mesh forces are the source of vibration and result from parametric excitation and contact nonlinearity. The primary goal of this work is to develop mathematical models for multi-mesh gearsets with nonlinear, time-varying elements, to conduct numerical and analytical studies on nonlinear gear dynamic behaviors, such as parametric instabilities, frequency response, contact loss, and profile modification, and to provide guidelines for practical design and troubleshooting. First, a nonlinear analytical model considering dynamic load distribution between individual gear teeth is proposed, including the influence of variable mesh stiffnesses, profile modifications, and contact loss. This model yields better agreement than two existing models when compared against nonlinear gear dynamics from a finite element benchmark. Perturbation analysis finds approximate frequency response solutions for providing guidance for optimizing system parameters. The closed-form solution is validated by numerical integration. Second, the nonlinear, parametrically excited dynamics of idler and counter-shaft gear systems are examined. The periodic steady state solutions are obtained using analytical and numerical approaches. With proper stipulations, the contact loss function and the variable mesh stiffness are reformulated into a form suitable for perturbation. The closed-form solutions from perturbation analysis expose the impact of key parameters on the nonlinear response. The analysis for this strongly nonlinear system compares well to separate harmonic balance/continuation and numerical integration solutions. Finally, this work studies the influences of tooth friction on parametric instabilities and dynamic response of a single-mesh gear pair. A mechanism whereby tooth friction causes gear tooth bending is shown to significantly impact the dynamic response. A dynamic model is developed to consider this mechanism together with the other contributions of tooth friction and mesh stiffness fluctuation. Perturbation analysis finds approximate solutions that predict and explain the parametric instabilities. The effects of time-varying friction moments about the gear centers and friction-induced tooth bending are critical to parametric instabilities and dynamic response. The impacts of friction coefficient, bending effect, contact ratio, and modal damping on the stability boundaries are revealed.
Download or read book An Experimental Investigation of the Static Transmission Error and Torsional Mesh Stiffness of Nylon Gears written by Chuan Wen Chi and published by . This book was released on 2006 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis details an investigation of the relationship between the static individual torsional mesh stiffness and the static transmission error of gears in mesh. The investigations of the individual torsional mesh stiffness are one of the fundamental concepts in gear analysis and behaviour that have been used in recent years for predicting transmission error. This research work was aimed at developing a better understanding of the fundamental mechanisms of the generation of vibration and noise in gear transmission systems. The research work for this thesis has two main parts. The first part involved measuring the static transmission error of gears through a series of experiments. An existing test rig was used for the experimental investigation where a nylon gear was placed in mesh with a fixed aluminium gear under various torques. Measurements of the rotation of the nylon gear at precise angular positions throughout the mesh cycle were used as a basis for determining the torsional mesh stiffness and the static transmission error. The second part involved the use of numerical analysis tools (PEA) to calculate the theoretical static transmission error and the individual torsional mesh stiffness in the same conditions as the experiments. The validity of the theory of individual torsional mesh stiffness was investigated, through a comparison between the experimental results and the PEA modelling results. The work included experiments, finite element analysis modelling, and statistical data analysis. The final results of this research project showed that individual torsional mesh stiffness theory can effectively predict transmission error in gear transmission systems, however some improvements need to be made to both the theory and the experiments.
Download or read book Gear Noise and Vibration written by J. Derek Smith and published by CRC Press. This book was released on 2003-04-08 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on over 40 years of consultation and teaching experience, Gear Noise and Vibration demonstrates logical gear noise and vibration approaches without the use of complex mathematics or lengthy computation methods. The second edition offers new and extended discussions on high- and low-contact ratio gears, lightly loaded gears, planetary and spli
Download or read book Dynamics of Planetary Gear Trains written by and published by . This book was released on 1984 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modeling and Analysis of Dynamic Systems written by Charles M. Close and published by . This book was released on 1993 with total page 708 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text is intended for a first course in dynamic systems and is designed for use by sophomore and junior majors in all fields of engineering, but principally mechanical and electrical engineers. All engineers must understand how dynamic systems work and what responses can be expected from various physical systems.
Download or read book Wind Energy Explained written by James F. Manwell and published by John Wiley & Sons. This book was released on 2010-09-14 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wind energy’s bestselling textbook- fully revised. This must-have second edition includes up-to-date data, diagrams, illustrations and thorough new material on: the fundamentals of wind turbine aerodynamics; wind turbine testing and modelling; wind turbine design standards; offshore wind energy; special purpose applications, such as energy storage and fuel production. Fifty additional homework problems and a new appendix on data processing make this comprehensive edition perfect for engineering students. This book offers a complete examination of one of the most promising sources of renewable energy and is a great introduction to this cross-disciplinary field for practising engineers. “provides a wealth of information and is an excellent reference book for people interested in the subject of wind energy.” (IEEE Power & Energy Magazine, November/December 2003) “deserves a place in the library of every university and college where renewable energy is taught.” (The International Journal of Electrical Engineering Education, Vol.41, No.2 April 2004) “a very comprehensive and well-organized treatment of the current status of wind power.” (Choice, Vol. 40, No. 4, December 2002)
Download or read book Bevel Gear written by Jan Klingelnberg and published by Springer. This book was released on 2016-03-25 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first book to offer a complete presentation of bevel gears. An expert team of authors highlights the areas of application for these machine elements and presents the geometrical features of bevel gears as well as the various gear cutting processes based on gear cutting theory. The aspect of three-dimensional gearing is assessed in detail in terms of flank design, load capacity and noise behavior. A representation of production processes with the required technologies provides a knowledge base on which sound decisions can be based. The authors offer a thorough introduction to the complex world of bevel gears and present the rapid advances of these machine elements in a detailed, comprehensible manner. This book addresses design engineers in mechanical engineering and vehicle manufacturing, as well as producers of bevel gears and students in mechanical engineering.
Download or read book Vibrations in Rotating Machinery written by IMechE (Institution of Mechanical Engineers) and published by John Wiley & Sons. This book was released on 2004-10-22 with total page 750 pages. Available in PDF, EPUB and Kindle. Book excerpt: This essential text contains the papers from the 8th international IMechE conference on Vibrations in Rotating Machinery held at the University of Wales, Swansea in September 2004. The themes of the volume are new developments and industrial applications of current technology relevant to the vibration and noise of rotating machines and assemblies. TOPICS INCLUDE Rotor balancing – including active and automatic balancing Special rotating machines – including micromachines Oil film bearings and dampers Active control methods for rotating machines Smart machine technology Dynamics of assembled rotors Component life predictions and life extension strategies The dynamics of geared systems Cracked rotors – detection, location ad prognosis Chaotic behaviour in machines Experimental methods and discoveries.
