This paper presents a prescribed-time tracking control scheme for robotic systems with unknown dynamics. One salient feature is that the robotic systems can achieve prescribed-time stability with the prescribed transi...
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ISBN:
(纸本)9798350321050
This paper presents a prescribed-time tracking control scheme for robotic systems with unknown dynamics. One salient feature is that the robotic systems can achieve prescribed-time stability with the prescribed transient performance, which is different with the traditional work that achieves uniformly ultimately bounded (UUB) and/or asymptotic stability. To realize this purpose, the prescribed performance dynamics (PPD) instead of the traditional prescribed performance function (PPF) is suggested, by which both the transient and steady-state tracking performance can be guaranteed within a specified region inpriori. To avoid using the function approximators (i.e., neural networks (NNs), fuzzy logic systems (FLSs)), an approximation-free-based prescribed-time controller is established with the inertial matrix of robotic systems and the finite-time function merely, which can not only address the system unknown uncertainties but also regulate the control error to zero in a prescribed-time. Furthermore, the Lyapunov-based theoretical analysis is conducted to prove the prescribed-time stability of the closed-loop system. Finally, comparative numerical simulation results are provided to demonstrate the effectiveness of the proposed method.
The heating, ventilation, and air conditioning(HVAC) system consumes a large amount of energy in buildings. Accurate modeling of the HVAC refrigeration room system is crucial for building temperature control and optim...
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ISBN:
(纸本)9798350321050
The heating, ventilation, and air conditioning(HVAC) system consumes a large amount of energy in buildings. Accurate modeling of the HVAC refrigeration room system is crucial for building temperature control and optimization of energy consumption. In this paper, Levenberg Marquardt (LM) algorithm and particle swarm optimization (PSO) algorithm are used to establish a nonlinear autoregressive neural network model (PSO-NARX) for the modeling of water chillers in HVAC systems. NARX is a model used to describe nonlinear discrete systems. At the same time, using particle swarm optimization algorithm can improve the accuracy of the prediction model. The experimental results show that the PSO-NARX model can effectively model and predict the chiller model, and its performance is better compared to traditional DNN neural networks.
Path planning is a classical problem of artificial intelligence, with a wide range of applications in defense and military, road traffic, and robotics simulation. However, most of the existing path planning algorithms...
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ISBN:
(纸本)9798350321050
Path planning is a classical problem of artificial intelligence, with a wide range of applications in defense and military, road traffic, and robotics simulation. However, most of the existing path planning algorithms have the problems of a single environment, discrete action space, and manual modeling. As a machine learning method that does not require artificially providing training data to interact with the environment, the deep reinforcement learning obtained by reinforcement learning has further enhanced the ability to solve practical problems. This paper proposes to use the DDPG (Deep Deterministic Policy Gradient) algorithm on the mobile sensor to achieve path planning on the target. The DDPG algorithm combines strategies such as DQN, ActorCritic, and PolicyGrient, which introduce deep reinforcement learning to continuous action space and further enable decision-making judgments in complex continuous environments.
In many real-world environments, such as soldiers and general in a battlefield, or teammates and goalkeeper in a soccer field, the "general" has a significantly stronger role than the "soldier", so...
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ISBN:
(纸本)9798350321050
In many real-world environments, such as soldiers and general in a battlefield, or teammates and goalkeeper in a soccer field, the "general" has a significantly stronger role than the "soldier", so that it is logical to assign higher "intelligence" and "flexibility" to the "general", we define it as special agent. Here, we propose a multi-agent reinforcement learning algorithm that provides stronger intelligence to special agent in a fully cooperative heterogeneous multi-agent environment. Similar to QMIX, we design a common monotonicity critic for all agents, but a separate actor network to improve its "intelligence" for the special agent. In this way we can improve the group's ability to cooperate by giving special agent greater ability, while ensuring that the group remains cooperative. We evaluate the above algorithm on two sets of StarCraft 2 micromanagement tasks, and the experimental results show that the algorithm has a significant advantage over baseline algorithms for tasks with significant heterogeneity.
In the magnetic sensitivity calibration system, the calibration accuracy of inertial sensor is directly related to the control accuracy of the magnetic induction intensity. Since the helmholtz coils in the calibration...
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ISBN:
(纸本)9798350321050
In the magnetic sensitivity calibration system, the calibration accuracy of inertial sensor is directly related to the control accuracy of the magnetic induction intensity. Since the helmholtz coils in the calibration system have large parameter uncertainties and the magnetic field sensor has some time-delay, the traditional PID controller cannot satisfy the accuracy requirement of the magnetic induction intensity. Therefore, an improved neural network based active disturbance rejection controller (ADRC) is proposed, which utilizes the conjugate gradient algorithm and Fletcher-Reeves linear search method to adjust the parameters of ADRC for achieving the optimal control efforts. Moreover, the extended state observer of ADRC can compensate for the parameter uncertainties and time-delay exactly such that the control accuracy of the magnetic induction intensity can be largely improved. The simulations are conducted to show the effectiveness and superiority of the proposed control algorithm.
Route planning is a key technology for unmanned surface vessel (USV) autonomous navigation. Traditional route planning algorithm usually has the shortcomings of complex calculation, long time and single algorithm func...
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ISBN:
(纸本)9798350321050
Route planning is a key technology for unmanned surface vessel (USV) autonomous navigation. Traditional route planning algorithm usually has the shortcomings of complex calculation, long time and single algorithm function. In this paper, aiming at the shortcomings of traditional algorithm, the route planning strategy of USV based on deep reinforcement learning (DRL) and velocity obstacle (VO) is designed. Using electronic nautical chart to build visual environment model;Based on the kinematics of USV, Markov decision process is established, and combined with the advantages of VO method and DRL, a general reward mechanism is designed, so that USV can achieve fast and safe route planning strategy in the complex marine environment where dynamic obstacles and static obstacles exist at the same time. In order to prove our method, a simulation experiment is introduced, and the results confirm the correctness and effectiveness of the proposed method.
With the improvement of people's health awareness, people pay more attention to their health. In recent years, the intelligent health management system based on food recognition technology has become popular, whic...
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ISBN:
(纸本)9798350321050
With the improvement of people's health awareness, people pay more attention to their health. In recent years, the intelligent health management system based on food recognition technology has become popular, which can help users maintain healthy eating habits. However, applying the current deep learning method in mobile phones and other terminal devices is difficult, mainly because the terminal devices have the low computing power and the network needs to perform many calculations during operation. In this paper, we have adopted the methods of parameter reconstruction and calculation graph fusion to reduce the network computing load so that it can run in real-time in terminal devices, and the detection speed on Snapdragon 778G SOC exceeds 7 FPS. Besides, experiments on the VIPER-FoodNet (VFN) dataset show that our model has a high mean average precision ( mAP) of 9.17% compared with the current advanced model.
In order to analyze and design an ultrasonic motor (USM) control system, an accurate and reliable mathematical model should be established. Due to the nonlinear characteristics of the motor, which are resulted from sp...
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ISBN:
(纸本)9798350321050
In order to analyze and design an ultrasonic motor (USM) control system, an accurate and reliable mathematical model should be established. Due to the nonlinear characteristics of the motor, which are resulted from special structure and complicated working principle, traditional modeling methods are no longer applicable. Nonlinear Hammerstein model structure is proved to be a better choice for describing nonlinearities in operation after years of study and practice. The Hammerstein model of the equivalent circuit model can be established to simulate the process of modeling the actual motor since both of the two models are in a one-to-one correspondence with the motor. In this paper, following the establishment of the equivalent circuit model, a model based on this idea is established with two-phase driving voltage as its inputs. The complete modeling process is given and the method is applied to an actual ultrasonic motor, which verifies the effectiveness of the proposed method.
The paper delves into the H∞ control problem of linear discrete-time systems under the circumstances of unknown system models and the presence of disturbances. This paper proposes a model-free H∞ control method base...
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In this paper, a position control method based on generalized disturbance estimation is proposed to solve the problem of position accuracy of magnetic levitation ball system under the influence of mismatched multiple ...
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ISBN:
(纸本)9798350321050
In this paper, a position control method based on generalized disturbance estimation is proposed to solve the problem of position accuracy of magnetic levitation ball system under the influence of mismatched multiple disturbances. Firstly, an Luenberger observer is designed to estimate the state variables of the system. Considering the known disturbance information, a generalized disturbance estimator is designed to estimate the disturbance using the internal model principle. Then, the disturbance estimation and its derivative are introduced into the control law design to eliminate the influence of the mismatched multiple disturbances on the position output, and the disturbance compensation gain is designed for the control law. At the same time, the reference input compensation gain is designed to solve the problem of tracking the time-varying reference position under mismatched disturbance. Then, the stability and disturbance rejection performance of the proposed method are analyzed, and it is proved that the proposed method can achieve high precision position control of the magnetic levitation ball system under mismatched multiple disturbances. In order to verify the effectiveness of the proposed method, MATLAB/Simulink is used to simulate and verify the proposed method.
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