Papers by Keyword: Planetary Gear Train

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Authors: Ming Yue Ma, Xiang Yang Xu
Abstract: As well known, graph theory is a powerful tool for mechanism design. The enumeration of planet gear trains can be converted the synthesis of graphs while a planetary gear train is converted to a graph. During the enumeration of graphs, the problem of isomorphism should be solved. This paper proposes a novel algorithm used to generate non-isomorphism graphs and thereby omits the part of isomorphism detection. The vertex characteristic is firstly defined in this paper that is the core of the enumeration algorithm. This paper also gives an example of the application for the algorithm.
Authors: Kai Xu, Geng Liu, Xiao Zhong Deng, Jian Jun Yang, Jian Xin Su
Abstract: Planetary gear trains have many advantages in applications. In these advantages, quiet noise and slight vibration may be contribute to low Transmission Error (TE), which can be calculated by Tooth Contact Analysis (TCA). However, to obtain numerical solution of the meshing equations based on TCA for planetary gear trains is very difficult because of a large number of nonlinear equations and unknowns. A simplified method utilizing planet phase angle is investigated and the numerical solution of planetary gear trains TE by TCA can be realized in this paper.
Authors: Long Chang Hsieh, Hsin Sheng Lee, Teu Hsia Chen
Abstract: Planetary gear trains can be used as the transmission systems with high reduction ratio for power machinery. The purpose of this paper is to propose an algorithm for the kinematic design of planetary gear trains with high reduction ratio. Based on the concept of train value equation, we propose a new representation to present the kinematic relationship of the members of the train loop. According to this representation graph, we propose an efficient algorithm for the kinematic design of planetary gear trains with high reduction ratio. Three design examples are designed to illustrate the design algorithm. Based on the proposed algorithm, all planetary gear trains with high reduction ratio can be synthesized.
Authors: Murelitharan Muniandy, Kanesan Muthusamy
Abstract: The automated guided vehicle (AGV) is a key component for the successful implementation of flexible manufacturing systems (FMS). AGVs are wheeled mobile robots (WMR) employed for material handling in the constantly evolving layouts of these modern factory shop floors. As such their ability to navigate autonomously is an equally important aspect to sustain an efficient manufacturing process. However, their mobility efficiency is inherently affected by the unproductive systematic and non-systematic odometry errors. Odometry errors mainly occur due to the mobility configuration of the AGV drive train and the surface characteristics the robot is interacting with. Odometry error accumulates over the distance traveled and leads to severe dead reckoning inaccuracy if the robot’s feedback control mechanism is unable to correct the error fast. This paper proposes an innovative drive train mechanism called dual planetary drive (DPD) that will minimize odometry errors without the need for complex electronic feedback control systems
Authors: Jing Han, Hun Ju Liu
Abstract: This paper presents a new driving system for realize the function of soft-starting and soft-stopping of belt conveyor. This device consists of planetary gear box, tow motors and controlling system. The basic concept is to combine differential planetary gear trains and converter technique. So, by controlling the angular velocity of inner gear the belt conveyor can realize the function of soft-starting and soft-stopping. During the working period this system has four different modes. By means of components libraries and virtual assembly the virtual model of CCSD is obtained. The kinematical and dynamic simulations are performed. By analysis the resisting force of belt conveyor we can obtain the curve of output-load properties of the controllable soft start equipment. As a result the dynamic force, the torque of each constrain, the ideal power of controlling motor, the ratio of main motor and controlling one were obtained.
Authors: Yi Chang Wu
Abstract: Integrated designs of brushless permanent-magnet (BLPM) motors and basic planetary gear trains (PGTs) are described in this paper. The kinematic characteristics of the basic PGT and the typical topologies of the BLPM motor are studied first. Then, design requirements are concluded to rationalize the integrated designs. Four novel integrated devices with interior and exterior topologies are synthesized subject to design requirements. The unique characteristics and application fields of the proposed designs are also indicated.
Authors: Liang Chen, Cheng Hui Gao, Guo Dong Jin
Abstract: The essence of the multidisciplinary collaborative design problem (MCDP) is the coordination of the design variables among multiple disciplines on the basis of the all constraints of all disciplines. There exist some problems such as the early detection of design conflicts and the determination of the consistency domains of the design variables, etc. The resolving of these problems can help designers avoid bad decision-making, reduce the design iteration and improve the design efficiency. Aiming at the problems, this paper proposes a constraint-net model to describe and manage all the design variables and constrains of all disciplines, discusses the reformulating method of the MCDP to improve computation efficiency, and develops the interval propagation algorithm to determine the consistency domains of the design variables, etc. A gear drive is taken as an example to illustrate the effectiveness of the proposed method.
Authors: Sung Hoon Park, Hyun Dai Yang, Jee Ho Kim, Joong Ho Shin
Abstract: A planetary gear train consists of a sun gear, planet gears, and a ring gear and these gears are arranged as a concentric circle type. The gearbox proposed in this study arranges the planetary gear type as a double planetary gear train in which the output of the primary gear train is used as an input to the secondary planetary gear for accelerating its speed. In this design, a method that directly connects the input and output sections is introduced to obtain a high acceleration ratio and its applicability is verified for applying it to a small wind turbine through designing and fabricating the planetary gearbox.
Authors: Ze Yong Yin, Bi Bo Fu, Tong Bo Xue, Yong Hong Wang, Jie Gao
Abstract: The helicopter power transmission system technology is the key technical area for improving the helicopter performance, reducing the noise/vibration level of helicopters and decreasing the cost of life cycle of helicopters. In this paper, the technical characteristics of the helicopter power transmission system are introduced first. Then, the development history and trend of the transmission configuration, the component and the design and analysis technique of the transmission system are described. The advanced material and process technology applied in the helicopter power transmission system are also described. Finally, the power transmission system technology used in the high speed helicopters is briefly presented.
Authors: Zheng Ming Xiao, Zhi Hong Yin, Yu Guo
Abstract: The speed increasing gearbox is the key part of the wind turbine, and it requires higher reliability and service life than general mechanical system. The single-stage planetary gears train(PGT) are commonly used in the semi-direct drive wind turbines, which sustain low speed, heavy load, varying speed and varying load. The dynamic characteristics are very complex, due to the frequent disturbance under the random wind and have a greater impact on reliability and stability of wind turbines. In this paper, the torsional dynamic model for PGT of semi-direct drive wind turbine was developed by lumped parameter method. According to the configuration and design parameters of the planetary gears, the natural frequencies are calculated, and the vibration modes are also analyzed. The actual wind speed is simulated by the weight sparse least squares support vector machines (WSLS- SVM), and the input torque load is also obtained. Considering the varying wind load and parameter excitations of system, the dynamic response of the PGT is calculated by numerical method.
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