In this paper, an improved optimal sliding mode control strategy is proposed for multi-motor driving servo system. Some states of multi-motor drive system are not measurable and there exists unknown nonlinearity. To s...
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ISBN:
(纸本)9781728159225
In this paper, an improved optimal sliding mode control strategy is proposed for multi-motor driving servo system. Some states of multi-motor drive system are not measurable and there exists unknown nonlinearity. To solve this problem, the disturbance observer and extended state observer are both applied to estimate the unknown states and nonlinearity. Based on optimal controltheory, the optimal sliding surface is selected to guarantee the optimal dynamic performance of the sliding mode of the system. the effectiveness of designed control methods is illustrated by simulation results.
the design of robust tracking control for a quadrotor is an important and challenging problem nowadays. In the paper, an active disturbance rejection control (ADRC) technique is developed for attitude and altitude tra...
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ISBN:
(纸本)9781728159225
the design of robust tracking control for a quadrotor is an important and challenging problem nowadays. In the paper, an active disturbance rejection control (ADRC) technique is developed for attitude and altitude tracking of a quadrotor unmanned aerial vehicle (UAV) system subject to external disturbances. the nonlinear dynamics model of quadrotor is first obtained by Newton-Euler formula. then, the control law, consisting of tracking differentiator (TD), extended state observers (ESO) and state error feedback (SEF) is designed. Finally, numerical simulations and experimental tests are conducted to illustrate the effectiveness of the proposed control strategy
this paper mainly develops a robust adaptive tracking control scheme to counter effects caused by load fluctuation and external disturbances. An adaptive controller based on appropriate control strategy and adaptive l...
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ISBN:
(纸本)9781728159225
this paper mainly develops a robust adaptive tracking control scheme to counter effects caused by load fluctuation and external disturbances. An adaptive controller based on appropriate control strategy and adaptive law is presented based on Lyapunov stability theory. the output voltage asymptotic tracking of the buck converters is obtained even under the influence of load fluctuation and external disturbances. Simulation results also reveal the availability of the proposed adaptive control scheme.
Recent work has demonstrated the efficiency of deep reinforcement learning (DRL) in making optimization decisions in complex systems. Compared with other DRL algorithms, the proximal policy optimization (PPO) has high...
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ISBN:
(纸本)9781728159225
Recent work has demonstrated the efficiency of deep reinforcement learning (DRL) in making optimization decisions in complex systems. Compared with other DRL algorithms, the proximal policy optimization (PPO) has higher stability and lower complexity. the typical flexible flowshop scheduling problem (FFSP) with identical parallel machines is an NP-hard problem. this paper is the first case to utilize PPO to solve the problem with makespan minimization. the particular state, action and reward function are designed for the FFSP to follow the Markov property. the efficiency of PPO is evaluated on the wafer pickling instance and random instances with different scales. the results show that PPO can always provide satisfactory solutions within a reasonable computational time.
this paper proposes a finite-time adaptive tracking control scheme for permanent magnet synchronous motors (PMSM) with full state constraints. In order to deal with full state constraints, the nonlinear transformation...
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ISBN:
(纸本)9781728159225
this paper proposes a finite-time adaptive tracking control scheme for permanent magnet synchronous motors (PMSM) with full state constraints. In order to deal with full state constraints, the nonlinear transformation function is first introduced to transform the constraint problem into a non-constraint problem. then, we will provide a tracking differentiator that get the differentiation of the virtual control laws. At the same time, the neural networks (NN) are employed to approximate unknown nonlinearities. Finally, simulation results are given to validate the proposed control scheme.
Prognostics and health management (PHM) is an important topic of rolling bearing, so partition of healthy stage and different degree of fault states are equally important as fault types. this study uses a multi-label ...
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ISBN:
(纸本)9781728159225
Prognostics and health management (PHM) is an important topic of rolling bearing, so partition of healthy stage and different degree of fault states are equally important as fault types. this study uses a multi-label learning method, Binary Relevance (BR) algorithm, for fault diagnosis of bearing data based on both of states partition and fault types judgment. the Binary Relevance algorithm simplifies the classification process by transforming the multi-classification problem into multiple binary classification problems. Using extreme learning machine ensures the classification speed and effect. By comparative experiments on XJTU-SY bearing datasets, the effectiveness of our method is proved to be superior.
this paper discusses the problems of the finite-time annular domain stability (FTAD-stability) and stabilization of discrete-time stochastic systems (DTSS). First, a definition of FTAD-stability for DTSS is given and ...
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ISBN:
(纸本)9781728159225
this paper discusses the problems of the finite-time annular domain stability (FTAD-stability) and stabilization of discrete-time stochastic systems (DTSS). First, a definition of FTAD-stability for DTSS is given and a stability criterion is also proposed. Second, we respectively give some sufficient conditions for the existence of state feedback controller (SFC), static output feedback controller (SOFC) and dynamic output feedback controller (DOFC). Finally, a numerical example is utilized to show the effectiveness of proposed method.
this paper studies the fault diagnosis of wind motors, which is an important way to improve the safety and reliability of wind motors. It is non-trivial to extract the fault features from the original vibration signal...
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ISBN:
(纸本)9781728159225
this paper studies the fault diagnosis of wind motors, which is an important way to improve the safety and reliability of wind motors. It is non-trivial to extract the fault features from the original vibration signals by the traditional methods. We propose a novel method to improve the fault diagnosis performances of wind motors. First, the Wigner-Ville distribution method is used to generate the time-frequency images of the vibration signals in different speed ranges of the motor, which is helpful for fault features extraction. then, we use the convolutional neural network, an important tool in the field of deep learning, to extract the fault features from the time-frequency images. Finally, simulation results based on the measurement data of an actual wind motor are provided to demonstrate the effectiveness of the proposed method.
作者:
Han, BenLiu, ShanZhejiang Univ
Coll Control Sci & Engn State Key Lab Ind Control Technol Hangzhou 310027 Peoples R China
Obstacle avoidance path planning is an important research topic in robot operation. As a complex system with multiple inputs and multiple outputs, highly nonlinear and strong coupling, the manipulator cannot be direct...
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ISBN:
(纸本)9781728159225
Obstacle avoidance path planning is an important research topic in robot operation. As a complex system with multiple inputs and multiple outputs, highly nonlinear and strong coupling, the manipulator cannot be directly regarded as a particle in Cartesian space, so many path planning algorithms for mobile robots cannot be directly extended to manipulators. In this issue, based on the rapidly-exploring random tree algorithm, this paper proposed an improved path planning method. the path is searched in the joint space of the manipulator, collision detection is performed in Cartesian space by solving forward kinematics, and then the Bezier curve is used to smooththe path. the experimental results indicate that the proposed method can effectively plan a smooth, collision-free and less expensive path.
this paper investigates the datadriven model free adaptive control (MFAC) problem for a class of non-affine nonlinear systems with stochastic fading channels. Firstly, the phenomenon of signal fading is regarded as a...
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ISBN:
(纸本)9781728159225
this paper investigates the datadriven model free adaptive control (MFAC) problem for a class of non-affine nonlinear systems with stochastic fading channels. Firstly, the phenomenon of signal fading is regarded as an independent stochastic process occurring at the output side, which has known mathematical expectations. Using an innovative linearization method, the considered non-affine system is converted into a linear model with a time-varying parameter called PPD and the MFAC controller is redesigned by utilizing the faded outputs. the stability of the system is analyzed rigorously and the influence of incomplete signal transmission on system convergence is explored. Finally, a numerical example shows the validity of the presented strategies.
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