Papers by Author: Yong Wang

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Authors: Jun Gang Wang, Yong Wang, Zhi Pu Huo
Abstract: A translational-rotational-coupling dynamic model has been built in the carrier-attached coordinate system.Differential equations of the system have been derived, and the natural frequencies and vibration modes of the planetary gear set have been obtained through solution of the associated eigenvalue problem. Based on the properties of the transmission system, the vibration modes of 2K-H spur planetary gear set can be classified into three categories, i.e., translational mode along radial direction, rotational mode, and planet mode.
Authors: H. Mei, Yong Wang
Abstract: A new learning way for neural network (NN) in which its weights can be optimized by using the ant colony algorithm is presented in this paper. The learning of neural network belongs to continuous optimization. The ant colony algorithm is initially developed for hard combinatorial optimization. A kind of ant colony optimization (ACO) for continuous optimization, which includes global searching, local searching and definite searching, is developed based on the basic ant colony algorithm. A three-layer neural network, as an example, is trained to express nonlinear function. The efficiency of the new algorithm is examinated. It is found that the new developed method has the merits of both ant colony algorithm and neural network.
Authors: Xian Lun Wang, Yong Wang, Yun Na Xue
Abstract: To achieve the desired dynamic impedance and the smooth chamfer contour, some adaptive controls and intelligent control schemes are incorporated in the impedance control for uncertain constrained robot systems. Most of them still result in an uneven chamfer for its characteristics in nature as the burrs vary highly. In this paper, an intelligent force controller based on impedance control with a neural network compensator is proposed for the robotic deburring process. The compensator is used to deal with the various burrs by modifying the input command according to the contact force and reference position. The performance of the intelligent force controller is compared with the conventional impedance control. The effectiveness of the proposed approach is testified by simulation experiments of the robotic deburring process.
Authors: Yong Wang
Abstract: In this paper, new sprocket tooth profile is developed to reduce polygonal action and meshing impact under high speed. The new conjugated profile is derived by modifying involute profile to guarantee that the moving distance of chain is equal to the arc length of pitch circle that sprocket rotates at the same time and the centre line of chain at tight side is tangent to the pitch circle always. An asymmetrical modification method for the sprocket tooth profile is also proposed. The multi-body dynamic model of timing mechanism in engine with the intake and exhaust sprockets is developed. The fluctuation and meshing impact of chain are analyzed under different rotating speeds. The results show that new developed sprocket profile can efficiently reduce meshing impact and friction of chain. The stability of chain transmission under high speed can be improved.
Authors: Yu Dong Xie, Yan Jun Liu, Yong Wang
Abstract: A new hybrid-control structure for the compensation of the volume-delay negative effect in the mixed-gas pressure control is designed. The volume-delay mechanism is discussed. A Smith predictor is used in the primary loop of a cascade control system where the secondary loop has a negligible delay while the primary loop has a significant and variant delay. To deal with the sensitivity of Smith predictor to modeling error, the gas pipe model for the Smith predictor can be updated by measuring the gas pressure and choosing the model characteristics through a lookup table. The results show that the proposed control structure brings together the best merits of a cascade control and the Smith predictor structure, and it can provide a better performance than the traditional cascade control.
Authors: Long Hui Wang, Yong Wang
Abstract: Direct drive electro-hydraulic actuator is a new type of hydraulic transmission with easy maintenance and high efficiency, which has been widely used in municipal engineering (such as water pipe network, gas pipe network), nuclear power plants, and other occasions. For these applications, we designed the electro-hydraulic valve actuator based on Internet of things technology (IOT for short). This paper introduces the mechanical structure and the working principle of the direct-drive electro-hydraulic valve actuator, analyzes IOT architecture. Detailed design was carried on according to the IOT architecture and related experiments have been done. The actuator can automatically, accurately control valve opening, be monitored by PC remotely, display device real-time information through LCD and be operated by touch screen.
Authors: Hong Mei, Yong Wang
Abstract: A solution to the problem of the elimination of the chattering effect and the improving of the convergence speed for sliding mode control is presented in this paper.A new dynamical sliding mode controller is developed which takes the first derivative of the control signal instead of the actual control as control and results in smoothed control inputs to the given system.A new nonlinear sliding mode surface is devised which can improve the convergence speed in the sliding phase.Exponential reaching law is taken to determine the control law which can improve the convergence speed in the reaching phase.A mobile manipulator with two arms is taken as an example to track a given trajectory with the proposed controller. It is found that the new developed method has a high convergence speed and the chattering is also reduced greatly.
Authors: Yu Dong Xie, Yan Jun Liu, Yong Wang
Abstract: The principle of an electro-hydraulic servo-driven control valve used to regulate mixed-gas pressure in combined cycle power plant is introduced. The mathematic model for describing the dead-band characteristics of the electro-hydraulic servo-driven control valve is built. The effect of driving system leakage of the control valve on the performances of the control valve is analyzed. The results show that the dead band of the electro-hydraulic servo-driven control valve increases with the rise of the system leakage, the leakage affects the response rapidity and the control accuracy of the control valve, and the valve control effect on the pressure pulsation of the mixed gas decreases with the increase of the system leakage.
Authors: Fa Ye Zang, Yong Wang, Xiang Zhen Kong
Abstract: A secondary hydraulic transmission control method is presented based on the fuzzy-neural network control which introduces the fuzzy control into neural network. The simulation results show the self-adaptive ability and controlling performance of the secondary hydraulic transmission system is improved.
Authors: Yue Rong Zhang, Yong Wang
Abstract: Control valves are the crucial assembly, which controls the flow of medium in fluid machines. Control valves play an important role in electricity industry, nuclear industry, and chemical engineering. The technology of fault diagnosis is applied to the fault detection and fault diagnosis of the control valve with high flow rate for the sake of economic development and safety. This paper presents results of a study on classification and mechanism of the common faults of control valves in connection with the structure of the valve applied to the circle-electricity industry. We analyzed the principles and characteristics of different diagnosis methods, discussed the mechanism of different faults of the valve. Furthermore, we investigated the diagnosis method that is suitable for different faults of the valve and the pivotal technique with which intelligent fault diagnosis (IFD) can be realized successfully. In addition, the route and the plan of the study on IFD of the control valve with high flow rate is suggested to develop a system of intelligent fault diagnosis and detection (IFDD) for the control valve.
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