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Three dimensional calculation of meshing stiffness for spur gears
, Article DETC2005: ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, Long Beahc, CA, 24 September 2005 through 28 September 2005 ; Volume 5 , 2005 , Pages 869-873 ; 079184742X (ISBN); 9780791847428 (ISBN) ; Saryazdi, M. Gh ; Sharif University of Technology
American Society of Mechanical Engineers
2005
Abstract
This article presents a new method for determination of meshing stiffness of the gear teeth using three dimensional analysis of tooth stiffness. The teeth are treated as explicit capacitive fields and their compliance matrix is determined by considering virtual interconnected springs located at defined nodes on tooth profile. The stiffness of any arbitrary point on the profile can then be determined as a linear function of neighboring nodes stiffness. The results of this analysis help in determination of load distribution for a pair of meshing gears under real operation conditions where deflections and misalignments are inevitable. Copyright © 2005 by ASME
Simulation of Three Dimensional Crack in Spur Gears due to Misalignment
, Ph.D. Dissertation Sharif University of Technology ; Durali, Mohammad (Supervisor)
Abstract
Fatigue crack is one of the most important causes of defect for gear systems. This effect results tooth fracture and failure of other elements of the power transmission systems. As a result, much effort has been devoted to the modeling of fatigue crack and improving the methods of crack detection. Simulations of three dimensional crack growth in spur gears due to misalignment and examination of this effect on vibration response of gear system are the main goals of this research. To model the crack growth, a new method of gear meshing modeling was proposed. In this method, the effects of pinion on the gear and vice-versa are modeled by a finite set of virtual interconnected springs. The...
Nonlinear dynamic analysis of a new antibacklash gear mechanism design for reducing dynamic transmission error
, Article Journal of Mechanical Design, Transactions of the ASME ; Volume 137, Issue 5 , 2015 ; 10500472 (ISSN) ; Dabbagh, V ; Amini, H ; Sarhan, A. A ; Akbari, J ; Hamdi, M ; Sharif University of Technology
American Society of Mechanical Engineers (ASME)
2015
Abstract
In this study, a new antibacklash gear mechanism design comprising three pinions and a rack is introduced. This mechanism offers several advantages compared to conventional antibacklash mechanisms, such as lower transmission error as well as lower required preload. Nonlinear dynamic modeling of this mechanism is developed to acquire insight into its dynamic behavior. It is observed that the amount of preload required to diminish the backlash depends on the applied input torque and nature of periodic mesh stiffness. Then, an attempt is made to obtain an approximate relation to find the minimum requiring preload to preserve the system's antibacklash property and reduce friction and wear on the...
The effect of three-dimensional crack growth on the force distribution and meshing stiffness of a spur gear: Ideal and misaligned contacts
, Article Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science ; Volume 223, Issue 7 , 2009 , Pages 1633-1644 ; 09544062 (ISSN) ; Durali, M ; Sharif University of Technology
2009
Abstract
This article presents a routine for prediction of the crack growth path in gears. Crack simulation helps in determining failure modes and crack detecting by vibration monitoring. To simulate crack propagation an effective method is developed by which the meshing force is calculated based on the compliance of meshing teeth in every stage of crack growth. In this method the compliance matrix of the tooth is calculated using three-dimensional boundary element analysis without the need for simultaneously modelling two meshing gears. The force distribution on the contact area is then calculated using Hertz theory and compliance matrices of meshing teeth. The method is used in prediction of the...
Design and Optimization of Gears Using Lattice Structure for Additive Manufacturing
, M.Sc. Thesis Sharif University of Technology ; Khodaygan, Saeed (Supervisor)
Abstract
Gears are a major component of many transmission systems. nowadays, improving the operating conditions and reducing the weight of the gears is one of the most needed issues in the industry. This dissertation aims to find the optimal structure of gear under different load cases and reduce its weight optimally. In this regard, topology optimization is used to develop the gear structure.In this research, two areas of bio-inspired design and additive manufacturing are used to achieve goals. These two areas can make good use of each other's potentials and achieve results that were not previously possible with traditional methods of design and manufacturing. First, an introduction and history of...
The determination of meshing force distribution for spur gears
, Article 2008 ASME International Mechanical Engineering Congress and Exposition, IMECE 2008, Boston, MA, 31 October 2008 through 6 November 2008 ; Volume 11 , 2009 , Pages 451-458 ; 9780791848722 (ISBN) ; Ghasabzadeh Saryazdi, M ; Sharif University of Technology
2009
Abstract
This article presents a method for determination of meshing force distribution on contact region of spur gear teeth. In this method it is assumed that there are inter-connected springs on the teeth profile. These springs treat as capacitive fields. The compliance matrices of these fields are determined from the results of finite element analysis done on 3-D model of a gear. The tooth compliance matrix is used as a reference data to determine the tooth deformations for any meshing situation. The meshing force distribution is calculated using this reference data and Hertz theory for contacting bodies. The results of this analysis help in stress analysis under real operation conditions and more...