Relevant bibliographies by topics / Geac (Computer System)

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Geac (Computer System)'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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Journal articles on the topic "Geac (Computer System)"

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Hunter, Alison. "GEAC LOCAL INFORMATION SYSTEM AT HILLINGDON BOROUGH LIBRARIES." VINE 15, no. 4 (1985): 18–25. http://dx.doi.org/10.1108/eb040336.

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Wu, Yingnian, Guojun Yang, and Lin Zhang. "Mouse simulation in human–machine interface using kinect and 3 gear systems." International Journal of Modeling, Simulation, and Scientific Computing 05, no. 04 (2014): 1450015. http://dx.doi.org/10.1142/s1793962314500159.

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We never stop finding better ways to communicate with machines. To interact with computers we tried several ways, from punched tape and tape reader to QWERTY keyboards and command lines, from graphic user interface and mouse to multi-touch screens. The way we communicate with computers or devices are getting more direct and easier. In this paper, we give gesture mouse simulation in human–computer interface based on 3 Gear Systems using two Kinect sensors. The Kinect sensor is the perfect device to achieve dynamic gesture tracking and pose recognition. We hope the 3 Gear Systems can work as a mouse, to be more specific, use gestures to do click, double click and scroll. We use Coordinate Converting Matrix and Kalman Filter to reduce the shaking caused by errors and makes the interface create a better user experience. Finally the future of human–computer interface is discussed.
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Jin, Xiang Yang, Xiang Yi Guan, Li Li Zhao, He Teng Wang, and Zhi Hui Sun. "An Analysis on Performance of High-Speed Gear Dynamics Based on Transfer-Matrix Method." Advanced Materials Research 415-417 (December 2011): 621–24. http://dx.doi.org/10.4028/www.scientific.net/amr.415-417.621.

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Analyze the dynamic characteristics of long tooth height gear transmission system by using transfer-matrix method. Firstly, set up a calculation model of level 2 transmission system for long tooth height gear and master gear and construct the transfer equation and transfer matrix of all components, then calculate the rigidity and rotational inertia of the system and know the natural frequency and dominant mode of the whole system through the computer, at last, analyze and compare two systems and prove the superiority of long tooth height gear for reducing vibration and lowering noise.
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Zheng, J. Y., and R. E. Reid. "Design Analysis of Ship Steering Gear Control Systems." Journal of Offshore Mechanics and Arctic Engineering 110, no. 3 (1988): 218–25. http://dx.doi.org/10.1115/1.3257054.

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The paper presents design analyses of ship steering gear control systems. Emphasis is placed on compressibility, leakage, friction, hydrodynamic damping, limiter and relay aspects of systems design. Computer simulation results are presented to assess the effect of design parameters on system performance for two different steering system/ship configurations. A design example is presented to show the main steps for designing a steering gear control system using single-loop bang-bang control with a variable capacity pump. The performance of the system is shown to be good.
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Tomlinson, S. P., and D. G. Tilley. "Computer Modelling of Aircraft Hydraulic Systems Using Bathfp." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 207, no. 2 (1993): 139–43. http://dx.doi.org/10.1243/pime_proc_1993_207_258_02.

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The computer simulation package BATHfp has been developed at the Fluid Power Centre, University of Bath to perform transient time domain simulations of fluid power systems. Utilities are provided which allow new models to be introduced into the component database. This enables the package to be tailored to particular dedicated areas of interest such as aircraft flight controls, braking and landing gear and fuel flow systems. This paper describes the application of BATHfp to aircraft hydraulic systems. An example is taken of an electrohydraulic position control system which uses an actuator to move an aileron according to a desired schedule. Parametric variations are made to illustrate how system performance can be improved.
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Chen, Ying Chung, Chung Hao Kang, and Siu Tong Choi. "Dynamic Analysis of a Spur Geared Rotor-Bearing System with Nonlinear Gear Mesh Stiffness." Advanced Materials Research 945-949 (June 2014): 853–61. http://dx.doi.org/10.4028/www.scientific.net/amr.945-949.853.

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The gear mesh stiffnesses have been regarded as constants in most previous models of geared rotor-bearing systems. In this paper, a dynamic analysis of a spur geared rotor-bearing system with nonlinear gear mesh stiffness is presented. The nonlinear gear mesh stiffness is accounted for by bending, fillet-foundation and contact deflections of gear teeth. A finite element model of the geared rotor-bearing system is developed, the equations of motion are obtained by applying Lagrange’s equation, and the dynamic responses are computed by using the fourth-order Runge-Kutta numerical method. Numerical results indicate that the proposed gear mesh stiffness provides a realistic dynamic response for spur geared rotor-bearing system.
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Bitto, Adenike. "What do “Back-to-School" Computers Have in Common with Health Education and Health Protection?" Californian Journal of Health Promotion 3, no. 3 (2005): 151–53. http://dx.doi.org/10.32398/cjhp.v3i3.654.

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How to increase immunization levels in communities is a recurrent problem associated with missed opportunities. As communities gear-up for Back to School, health educators may encourage people to update their child, adolescent, and adult immunizations. Human herd immunity can protect communities from spread of infection, and an analogy is presented with “herd immunity for personal computers.” Both computer and biological viruses spread faster when a large portion of the population is unprotected. Just as individuals should receive immunization shots to protect self and families; computer systems can be protected against nasty computer code by using current anti-virus programs to limit the spread of viruses, worms, and Trojan horses from one computer to another. How much more would individuals rather receive timely shots that help to preserve health? An ounce of prevention is worth a pound of cure.
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Yu, Lei, Hua Wang, and Li Qiang Han. "Development of Automobile Gear Motion Error Detection System." Applied Mechanics and Materials 536-537 (April 2014): 276–79. http://dx.doi.org/10.4028/www.scientific.net/amm.536-537.276.

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Dynamic precision measurement of transmission error involves many subjects such as optical, mechanical and electrical and computer at the forefront of technology has very important significance in the production. In order to achieve the accurate testing of motion error automobile gear, convenient and quick to obtain the gear tooth form error parameters, this paper research and design of the automobile gear error motion detection based on virtual instrument technology system, can accurately test automation, including visual inspection process, real-time detection information, read the data measured parameters, the analysis of characteristic curve, and other functions.
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Lin, Tylor T. C., and A. Seireg. "An Optimum Design Algorithm for Gear Systems Incorporating Surface Temperature." Journal of Mechanisms, Transmissions, and Automation in Design 107, no. 4 (1985): 549–55. http://dx.doi.org/10.1115/1.3260762.

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This paper presents a computer-based procedure for the optimum design of gear systems which selects the basic gear parameters to provide the best balance between the meshing elements for strength, surface durability, wear resistance and surface temperature. The emphasis is on the selection of the number of teeth in the different gears which provide the specified transmission ratio and maximize the load-carrying capacity of the system with special attention to the minimization of the maximum contact temperature.
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Guo, Hong Tao, and Wei Guo Zhang. "Design of Gear Parameters Visual System Based on LISP." Applied Mechanics and Materials 539 (July 2014): 42–46. http://dx.doi.org/10.4028/www.scientific.net/amm.539.42.

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Article use Visual LISP development tools and DCL dialog technology, which implements the standard straight teeth, a two-dimensional cylindrical gear parametric drawing on AutoCAD platform, with easy to operate and improve design efficiency. We achieved that using the dialog box design input parameters, and gear parts of the design calculations, parameters proofreading and all kinds of gear design drawing different structures by programming. The output is fully automated computer-aided design system. The results show that the design of the system significantly improves the efficiency of the part design.
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Dissertations / Theses on the topic "Geac (Computer System)"

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Costa, i. Bricha Elm. "Computer simulation of a capacitively coupled GEC cell." Thesis, Queen's University Belfast, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368881.

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Mdlazi, Lungile Mndileki Zanoxolo. "A synchronous filter for gear vibration monitoring using computational intelligence." Pretoria : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-05302005-095228/.

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Fang, Brian. "CAE Methods on Vibration-based Health Monitoring of Power Transmission Systems." DigitalCommons@CalPoly, 2013. https://digitalcommons.calpoly.edu/theses/1143.

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This thesis focuses on different methods to analyze power transmission systems with computer software to aid in detection of faulty or damaged systems. It is split into three sections. The first section involves utilizing finite element software to analyze gear stiffness and stresses. A quasi-static and dynamic analysis are done on two sets of fixed axis spur gears and a planetary gear system using ABAQUS to analyze the stress, strain and gear mesh stiffness variation. In the second section, the vibrational patterns produced by a simple bevel gear system are investigated by an experiment and by dynamic modeling in ADAMS. Using a Fast Fourier Transform (FFT) on the dynamic contact forces, a comprehensive frequency-domain analysis will reveal unique vibration spectra at distinct frequencies around the gear mesh frequencies, their super- and sub- harmonics, and their side-band modulations. ADAMS simulation results are then compared with the experimental results. Constraints, bearing resistant torques, and other key parameters are applied as closely as possible to real operating conditions. The third section looks closely at the dynamic contact forces of a practical two-stage planetary gear. Using the same FFT approach in the second section, a frequency-domain analysis will reveal distinct frequencies around both the first-stage and the second-stage gear mesh frequencies, and their harmonics. In addition, joint time-frequency analysis (JTFA) will be applied to damaged and undamaged planetary gear systems with transient start-up conditions to observe how the frequency contents of the contact force evolve over time.
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Tran, Tuan H. "Landing-Gear Impact Response: A Non-linear Finite Element Approach." UNF Digital Commons, 2019. https://digitalcommons.unf.edu/etd/896.

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The primary objective of this research is to formulate a methodology of assessing the maximum impact loading condition that will incur onto an aircraft’s landing gear system via Finite Element Analysis (FEA) and appropriately determining its corresponding structural and impact responses to minimize potential design failures during hard landing (abnormal impact) and shock absorption testing. Both static and dynamic loading condition were closely analyzed, compared, and derived through the Federal Aviation Administration’s (FAA) airworthiness regulations and empirical testing data. In this research, a nonlinear transient dynamic analysis is developed and established via NASTRAN advanced nonlinear finite element model (FEM) to simulate the worst-case loading condition. Under the appropriate loading analysis, the eye-bar and contact patch region theory were then utilized to simulate the tire and nose wheel interface more accurately. The open geometry of the nose landing gear was also optimized to minimize the effect of stress concentration. The result of this research is conformed to the FAA’s regulations and bound to have an impact on the design and development of small and large aircraft’s landing gear for both near and distant future.
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Sommer, Andrew Patrick. "VIBRATION-BASED HEALTH MONITORING OF MULTIPLE-STAGE GEAR TRAIN AND DIFFERENTIAL PLANETARY TRANSMISSION INVOLVING TEETH DAMAGE AND BACKLASH NONLINEARITY." DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/631.

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The objective of this thesis is to develop vibration-based fault detection strategies for on-line condition monitoring of gear transmission systems. The study divides the thesis into three sections. First of all, the local stresses created by a root fatigue crack on a pinion spur gear are analyzed using a quasi-static finite element model and non-linear contact mechanics simulation. Backlash between gear teeth which is essential to provide better lubrication on tooth surfaces and to eliminate interference is included as a defect and a necessary part of transmission design. The second section is dedicated to fixed axis power trains. Torsional vibration is shown to cause teeth separation and double-sided impacts in unloaded and lightly loaded gearing drives. The transient and steady-state dynamic loading on teeth within a two stage crank-slider mechanism arising from backlash and geometric manufacturing errors is investigated by utilizing a non-linear multi-body dynamics software model. The multi-body model drastically reduces the computation time required by finite element methods to simulate realistic operation. The gears are considered rigid with elastic contact surfaces defined by a penalty based non-linear contact formulation. The third section examines a practical differential planetary transmission which combines two inputs and one output. Planetary gears with only backlash errors are compared to those containing both backlash and tooth defects under different kinematic and loading conditions. Fast Fourier Transform (FFT) analysis shows the appearance of side band modulations and harmonics of the gear mesh frequency. A joint time-frequency analysis (JTFA) during start-up reveals the unique vibration patterns for fixed axis gear train and differential planetary gear, respectively, when the contact forces increase during acceleration.
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Chen, Jui-Bo, and 陳瑞栢. "Computer Aided Engineering and Manufacture of Multi-Gear Acceleration System." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/69429706418210172831.

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碩士<br>逢甲大學<br>材料與製造工程所<br>93<br>With the future metropolitan to be highly concentrated development, the folding bikes designed for tread, short, slight, light and handy is necessarily required. While the design shall be light and handy, the wheel diameter is generally smaller than 26” wheel, such as the wheel not less than 14” or 20” for its specifications in a limited folding space, whose diameter reduced in the same travel distance for pedaling rotation rate shall be increased to improve the comfortable riding. The problem of pedaling rotation rate shall be immediately to resolve； therefore, taking a measure to promote the pedaling rotation rate with an multi-gear acceleration system in treading can take for study. The research is to establish a set of multi-gear acceleration system of the computer aided design and engineering technique for the development of energy. With 3D CAD software PRO/E and SOLIDWORKS built as solid models, With the CAE software ANSYS and PEO/MECHANICA, it has applied to important components for structural strength simulation and lighter weights design. Carry out the fatigue strength test with AL-6061 T6 of T joint tube and build up S-N curve after testing. With the fatigue mold testing the comparable simulation under the same stress by PEO/MECHANICA, it has evaluated an tolerance between experiment and simulation to do 15%, The evaluation from the computer fatigue cycles higher than experiment to display the simulation is more comparative and ideal. The multi-gear acceleration system depends on the result of the computer aided design and engineering to be the account of the prototype and it shall be verified by the specified rules.
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Zen-Lin, Chen, and 陳增林. "The measurement of a gear by computer vision systems." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/82269337460960382656.

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Books on the topic "Geac (Computer System)"

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Westlake, Duncan. GEAC: A guide for librarians and systems managers. 2nd ed. Ashgate Publishing, 1992.

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Marec, Joëlle Le. Dialogue ou labyrinthe?: La consultation des catalogues informatisés par les usagers. Bibliothèque publique d'information, Centre Georges Pompidou, 1989.

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Litvin, F. L. Generation and tooth contact analysis of spiral bevel gears with predesigned parabolic functions of transmission errors. National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1989.

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Bennett, Sean. Modern diesel technology: Electronic diesel engine diagnosis. Thomson/Delmar Learning, 2007.

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Modern diesel technology: Brakes, suspension, and steering. Thomson Delmar Learning, 2007.

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Compute's Guide to Nintendo Games. Compute Books, 1989.

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Sandler, Corey. Batman Forever: The Video Game: GamePro: Official Player's Guide. Infotainment World, 1995.

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Redbooks, IBM. Geac System 21 Implementation for AS/400. Ibm, 2000.

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Redbooks, IBM. Geac System21 Commerce.Connect: Implementation on the IBM Iseries Server. Ibm, 2002.

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Great Britain. Manpower Services Commission., ed. Management training and development: A case of good practice : managing the implementation of an integrated computer system for manufacturing : a projectat GEC Small Machines Ltd.. Manpower Services Commission, 1988.

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Book chapters on the topic "Geac (Computer System)"

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Boniol, Frédéric, and Virginie Wiels. "The Landing Gear System Case Study." In Communications in Computer and Information Science. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07512-9_1.

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Dhaussy, Philippe, and Ciprian Teodorov. "Context-Aware Verification of a Landing Gear System." In Communications in Computer and Information Science. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07512-9_4.

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Mammar, Amel, and Régine Laleau. "Modeling a Landing Gear System in Event-B." In Communications in Computer and Information Science. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07512-9_6.

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Malina, Olga V. "New Approach to Computer-Aided Design of Gearbox Systems: Models and Algorithms." In New Approaches to Gear Design and Production. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-34945-5_19.

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Le, Hieu Hanh, Satoshi Hikida, and Haruo Yokota. "An Efficient Gear-Shifting Power-Proportional Distributed File System." In Lecture Notes in Computer Science. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-22852-5_14.

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Hansen, Dominik, Lukas Ladenberger, Harald Wiegard, Jens Bendisposto, and Michael Leuschel. "Validation of the ABZ Landing Gear System Using ProB." In Communications in Computer and Information Science. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07512-9_5.

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Malina, Olga V., and Maksim N. Mokrousov. "New Approach to Computer-Aided Design of Gearbox Systems: Conception and Development of Information Support." In New Approaches to Gear Design and Production. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-34945-5_20.

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Su, Wen, and Jean-Raymond Abrial. "Aircraft Landing Gear System: Approaches with Event-B to the Modeling of an Industrial System." In Communications in Computer and Information Science. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07512-9_2.

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Arcaini, Paolo, Angelo Gargantini, and Elvinia Riccobene. "Modeling and Analyzing Using ASMs: The Landing Gear System Case Study." In Communications in Computer and Information Science. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07512-9_3.

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Kossak, Felix. "Landing Gear System: An ASM-Based Solution for the ABZ Case Study." In Communications in Computer and Information Science. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07512-9_10.

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Conference papers on the topic "Geac (Computer System)"

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Stringer, D. Blake, Amir Younan, Pradip N. Sheth, and Paul E. Allaire. "Generalized Stiffness Gear-Mesh Matrix Including EHD Stiffness." In ASME/STLE 2007 International Joint Tribology Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ijtc2007-44473.

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This paper presents a method to compute gear mesh stiffness based on the EHD behavior by combined finite element solution of the Reynolds Equation with the elastic contact model. It is shown that this solution requires iterative procedure to balance the computed pressure profile with the external nominal transmission load. This mesh stiffness is load dependent and therefore is a nonlinear phenomenon. The nominal stiffness value is utilized to model a full (12×12) gear mesh matrix for a linear dynamic model of rotor bearing systems including gears to evaluate system dynamics and coupling between lateral/torsional vibrations.
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Yazdanshenas, Alireza, Emilli Morrison, Chung-Hyun Goh, Janet K. Allen, and Farrokh Mistree. "Computer-Aided Gear Product Realization." In ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/detc2018-86105.

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To save time and resources, many are making the transition to developing their ideas virtually. Computer-aided gear production realization is becoming more and more desired in the industry. To produce gears with custom qualities, such as material, weight and shape, the trial and error approach has yielded the best results. However, trial and error is costly and time consuming. The computer-aided integrated design and manufacturing approach is intended to resolve these drawbacks. A simple one stage reduction spur gearbox is used as an example in a case study. First, the gear geometry is developed using computer aided design (CAD) modeling. Next, using MATLAB/Simulink, the gear assembly is connected virtually to other subsystems for system expectations and interaction analysis. Finally, using finite element analysis (FEA) tools such as ABAQUS, a dynamic FEA of the gear integration is completed to analyze the stress concentrations and gear tooth failures. Through this method of virtual gear design, customized dimensions and specifications of gears for satisfying system-level requirements can be developed, thereby saving time and manufacturing costs for any custom gear design request.
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Sacks, Elisha, Leo Joskowicz, Ralf Schultheiss, and Uwe Hinze. "Computer-Assisted Kinematic Tolerance Analysis of a Gear Selector Mechanism With the Configuration Space Method." In ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/dac-8703.

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Abstract This paper presents a case study in computer-assisted tolerancing with the configuration space method. We analyze part of a gear selector mechanism in an automotive automatic transmission. The model contains three complex parts with 99 functional parameters. The analysis, which takes less than a minute on a workstation, indicates that the critical kinematic variation occurs in third gear and identifies the parameters that cause the variation. The analysis program handles general planar systems of curved parts with contact changes, including open and closed kinematic chains. It computes the worst-case variation in the system kinematic function and detects potential failure modes due to unexpected qualitative variations in function, such as jamming. It constructs configuration space models of the kinematic variations of the pairs in the system then derives the system variation by composing the pair models.
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Chang, Li. "Modeling and Computer Simulation Analysis of Bearing-Gear System." In 2020 International Wireless Communications and Mobile Computing (IWCMC). IEEE, 2020. http://dx.doi.org/10.1109/iwcmc48107.2020.9148374.

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Grauer, Manfred, and Harald Boden. "On the Solution of Nonlinear Engineering Optimization Problems on Parallel Computers." In ASME 1993 Design Technical Conferences. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/detc1993-0396.

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Abstract This paper is intended to give an overview on nonsequential solution approaches in nonlinear optimization and an introduction to the OpTiX-II Decision Support System (DSS) for the solution of nonlinear optimization problems. The purpose of OpTiX-II is (i) to supply engineers/decision makers with the knowledge of an optimization and computer expert, (ii) to make use of modern computer technology (e.g. computer networks, parallel computers) for attaining faster and more reliable problem solutions and (iii) to supply an easy-to-use graphical interface for untrained computer users. Thereby OpTiX-II enables the user to solve nonlinear (decomposed) optimization problems on networks of (heterogeneous, parallel) computers. Currently, the multiprocessor architectures, which are supported by OpTiX-II, range from entry level workstations via multiprocessor Unix workstations to Transputerclusters. A gear reducer design optimization problem will be used for demonstrating the application of OpTiX-II.
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Sezer-Uzol, Nilay, Anirudh Modi, Lyle N. Long, and Paul E. Plassmann. "Visualizing Computational Simulation Results Using Virtual Reality Technology." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45196.

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The visualization of computational simulations of complex physical problems using virtual reality technology is demonstrated in this study. A general-purpose computational steering system (POSSE) which can be coupled to any C/C++ simulation code, has been developed and tested with a 3-D parallel Navier-Stokes flow solver (PUMA2) [1]. In addition, the visualizations can be displayed using virtual reality facilities (such as CAVEs and RAVEs) to better understand the 3-D nature of the flowfields. The simulations can be run on parallel computers such as Beowulf clusters, while the visualization is performed on other computers, through a client-server approach. A key advantage of our system is its scalability. Visualization primitives are generated on the parallel computer. This is essential for large-scale simulations, since it is often not possible to post-process the entire flowfield on a single computer due to memory and speed constraints. Example applications of time-dependent and three-dimensional computational flow simulations performed at Penn-State are presented to show the usefulness of POSSE and virtual reality systems. The examples include CFD predictions for unsteady simulations of a helicopter rotor, unsteady ship airwake simulations, helicopter tail fan-in-fin flow simulations and simulations of time-accurate flow and noise due to a landing gear.
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Lentini, Antonino Sergio, Sebastian Flock, and Yann Vonderscher. "Gear Whine Analysis of an Integrated-Spring Split Gear System." In ASME 2017 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/detc2017-68245.

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The need to reduce weight in internal combustion (IC) engines introduces new or increased NVH challenges. In particular, gear-related noise such as rattle and whine need to be addressed. This paper discusses a methodology aimed at simulating a novel “split gear” system designed to counteract the rattle noise typically generated in accessory drive gears on combustion engines. In particular, the focus is on the increased gear whine associated with this system. The ‘split gear’ system is simulated as a multi-body system incorporating contact force prediction developed by Siemens. It enables efficient identification of the contact between gear teeth based on their intrinsic involute geometry, including the effects from microgeometry corrections as well as relative displacements and misalignments of the gears. The gear contact force is evaluated taking into account both compliances for the global bulk and local contact. The multi-body approach and dedicated modeling technique permitted the investigation of interaction between gears of the ‘split gear’ system and appropriate replication of the operational boundary conditions. The activity presented in this paper consisted of two main phases, measurements of the dynamic behavior of the split gear system and multi-body simulations. The former allows gathering reference data for validation of the simulation model built in the latter phase. The results show the potential of the new method to analyze gear systems in view of NVH performance.
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Zeid, Ashraf. "Multibody Modeling of Gear Dynamics With 3-D Contacts: Advances and Challenges." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14565.

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This paper describes the application of modeling of multibody systems to high-precision mechanical gears. Although the context of the paper is applied in nature, the objective is to present recent advances in computer-aided modeling of multibody systems with three-dimensional (3-D) contacts and to explore the limits of the technology, theory, and methods. Gear systems are traditionally modeled as single dimensional object with a simple transformation ratio. However, when we are interested in high precision gear systems, all joints and flexibility of gear shafts bearings are accounted for in the model. In this paper we discuss challenges in using recent advances in computer-aided multibody modeling (CAMM) with 3-D contacts applied to the design of a steering gear system. These advances in CAMM have made it possible to produce detailed dynamic simulation of constrained multibody motion in a much shorter time than the traditional Finite Element approach. Extracting position and velocity information from simulation of multibody models using CAMM is routine work today save for the most complex systems. However, extracting information about contact force between rigid bodies during impact subsequent rolling and sliding motions is a more challenging problem. This paper discusses these challenges and presents possible numerical and modeling solutions. Gears move in three-dimensional space, their surfaces undergoing continuous contact and separation; we distinguish between large dominant motion and microscopic motion along constraints axis. In an effort to understand motion of steering gear at the microscopic level, we modeled gears as multibody systems with their surfaces in a dynamic state of contact and separation. These models capture the dynamics of gears traveling distances of around 50 microns in less than 10 milliseconds. We applied newly developed analytic, numeric, and computer-aided tools to gain insight into gear forces, specifically, those forces responsible for the inception of mechanical knock in steering gear. The results provided a 3-D view of the sequence of events of gears with their surfaces in motion, in sudden contact, sliding, and the resulting force generation. The models include effect of friction on impact mechanics of the gears. First we briefly present a discussion of the state-of-knowledge in CAMM with three-dimensional surface contacts. Computer aided engineering requirements necessary to solve the problem are discussed together with computer hardware, software, and analysis methods that are necessary for successful modeling of multibody gear systems with 3-d contacts. We finally present a model of a generic gear system that demonstrates both the potential and the limitations of the current technology.
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Berri, Sidi M., and J. M. Klosner. "Simulation of the Rotational Vibration Response of a Spur Gear Pair With One Cracked Tooth." In ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0357.

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The present study introduces a developed simulator on rotational vibrations of a power transmission spur gear set with one cracked pinion tooth. The simulator computes the expected vibration response of the meshing gears by solving the differential equations of motion. In additions to accounting for the time-varying stiffness of the meshing tooth pair, the simulator also includes gear errors and damping. Dynamic tooth loads as a function of crack size are also computed. The simulated outputs depict precisely the experimental behaviors. Results for rotational vibrations of the power transmission system are presented as a function of crack size.
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10

Zhou, Li, Chi Dong, Xindong You, Jie Huang, and Congfeng Jiang. "Green gear-shifting mechanism in Cloud Storage System." In Computer Science and Technology 2015. Science & Engineering Research Support soCiety, 2015. http://dx.doi.org/10.14257/astl.2015.81.16.

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