Browsing by Author "Li, Gang"
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Item An active forming grinding method for cylindrical involute gears based on a second-order transmission error model(Science Research Association, 2019-03-23) Li, GangAn active form-grinding method is proposed to obtain excellent and stable contact performance of cylindrical gears by designing modification forms based on a predesigned controllable second-order transmission error function. First of all, a predesigned second-order transmission error polynomial function is assigned to the gear drive. Mathematical models of modified tooth surfaces that can describe their local deviation and ease-off topography are then obtained with the predesigned second-order transmission error function. Moreover, the form-grinding wheelās profile equation, the coordinate transformation matrix during formgrinding, and settings of computer numerical control form-grinding programs for this active design method can be determined. This approach is ultimately conducted on three involute cylindrical gear pairs to demonstrate its feasibility and effectiveness.Item Development Trend of Wind Power Technology(AI Publications, 2020-06) Yan, John; Li, Gang; Liu, KanThis paper describes the main types of the state-of-the-art wind energy harvesting technologies and their commercial prospects, and presents shortcomings of Betzās limit and misleading of the blade element-momentum theory for aerodynamic design and computational fluid dynamic simulation of vertical-axis wind turbines. A new aerodynamic design method for vertical-axis wind turbines is presented. A modular, combined, and low-cost wind turbine solution (āsuper turbineā) is developed based on the new aerodynamic design method. By comparing of levelized costs of energy of the super turbine and other wind energy harvesting technologies, the development direction of the new wind energy harvesting technology is explained.Item An Elastic Transmission Error Compensation Method for Rotary Vector Speed Reducers Based on Error Sensitivity Analysis(MDPI, 2020-01-09) Hu, Yuhao; Li, Gang; Zhu, Weidong; Cui, JiankunAn elastic transmission error (TE) compensation method for a rotary vector (RV) speed reducer is proposed to improve its transmission accuracy based on error sensitivity analysis. Elastic and geometric TEs of the RV speed reducer can be compensated by tooth surface modification of cycloidal gears. Error coefficients of the TE of the RV speed reducer are derived to determine error factors with positive effects on TEs based on error sensitivity analysis. A total TE, including the elastic TE, is obtained by using Adams. The elastic TE compensation method is developed to calculate modification values of error factors with positive effects on the TE to decrease the elastic TE of the RV speed reducer. TE simulation results show that the elastic TE accounts for 25.28% of the total TE, and calculation results show that the maximum contact force and normal deformation of the modified prototype are obviously improved. The feasibility and accuracy of the proposed elastic TE compensation method for RV speed reducers were verified by TE experiments. TE experiment results showed that the TE of the modified RV speed reducer is 47.22% less than that of the initial RV speed reducer.Item Iterative Optimization of Orbital Dynamics Based on Model Prediction(IOS Press) Hu, Yuhao; Li, Gang; Hu, AiminSliding door is an important part of commercial vehicle. Aiming at the problem of damage caused by the resonance of chuck and wheel in sliding guideway. The three-dimensional force and smoothness of sliding mechanism are studied. An improved guide rail system is designed in the grey model. In the non-linear optimization design [1], the trust domain multi-objective optimization algorithm is used to divide the model into a series of sub-regions. The model is solved iteratively in the trust region of the sub-region, and the design parameters satisfying the requirements of the smoothness of the guide rail are obtained. In ADAMS, the oblique vibration and force motion of components are simulated and analyzed when the track system is running normally. The results show that the force acting on each group of guide wheel mechanism can be effectively decomposed by using the multi-wheel design with separated forces. The smoothness and reliability of the system are improved.Item MASON: A Model for Adapting Service-Oriented Grid Applications(Springer, 2003) Li, Gang; Wang, Jianwu; Wang, Jing; Han, Yanbo; Zhao, Zhuofeng; Wagner, Roland M.; Hu, HaitaoService-oriented computing, which offers more flexible means for application development, is gaining popularity. Service-oriented grid applications are constructed by selecting and composing appropriate services. They are one kind of promising applications in grid environments. However, the dynamism and autonomy of environments make the issues of dynamically adapting a service-oriented grid application urgent. This paper brings forward a model that supports not only monitoring applications through gathering and managing state and structure metadata of service-oriented grid applications, but also dynamic application adjustment by changing the metadata. Besides that, the realization and application of the model is presented also.Item Study on Virtual Gear Hobbing Simulation and Gear Tooth Surface Accuracy(2023-07-12) Geng, Zhi; Li, GangThis paper presents a digital simulation method for the hobbing process of cylindrical gears. Based on the gear generation principle, taking the professional software as the tool, the problem of virtual hobbing simulation on involute helical gears was studied, and the virtual hobbing simulation of hobbing on the whole gear was completed by using macros of CATIA V5. The validity of this method was validated by analyzing the tooth surface accuracy error of the model which was below 0.001 mm between the virtual tooth surface and the theoretical tooth surface and the possible factors that affected the tooth surface accuracy during manufacturing were also carried on the discussion. It offers a fictitious three-D platform for studying the principle of manufacture errors of a gear-cutting machine as well as the finite element analysis between the ideal tooth surface and the erroneous tooth surface.