While different control approaches have been developed for smooth and safe navigation, they are limited by the needs for model-based assumptions, true training target/reward function, and/or large sample data. To over...
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ISBN:
(纸本)9798350377712;9798350377705
While different control approaches have been developed for smooth and safe navigation, they are limited by the needs for model-based assumptions, true training target/reward function, and/or large sample data. To overcome these limitations, this study proposes a model-free neural control architecture with a generic plug-and-play online Multiple Proactive Behavior learning (MPL) module. The MPL adapts robot neural control policy in an online unsupervised manner with small sample data by correlating its sensory inputs to a local planner command. As a result, it allows a mobile robot to autonomously and quickly learn and balance various proactive behaviors related to smooth motion and collision avoidance. It also compensates for the limited planning update rates and the planning model mismatch of an arbitrary local motion planner. Compared with existing control approaches without the MPL, our control architecture with the MPL leads to (1) a 10% improvement in the smoothness of robot motion and 30% fewer collisions in a narrow static environment, and (2) trading motion smoothness for up to 70% fewer collisions in an unknown dynamic environment. Taken together, this study also demonstrates how to apply model-free neural control with unsupervised learning to existing model-based control (e.g., local motion planner) for efficient proactive behavior learning and control of mobile robots.
This paper investigates the security data-drivencontrol problem for repetitive nonlinear systems with fading channels under denial-of-service (DoS) attacks. Firstly, under the influence of fading channels, a novel da...
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Many manufacturing companies control their production machines to produce good products within quality standards by using the results of research on physical or chemical models. Those models are developed from knowled...
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Many manufacturing companies control their production machines to produce good products within quality standards by using the results of research on physical or chemical models. Those models are developed from knowledge of the physical or chemical changes that occur when the products are processed and operational knowledge. However, it is difficult for some companies to research physical or chemical models. We study data-drivencontrolsystems to enable the stable production of good products when it is difficult to study and develop physical and chemical models or to use operational knowledge. In this paper, we propose an algorithm that builds an alternative model from actual operation data using machine learning and finds the optimal operating conditions under which the product is within the quality standards range using 0-1 integer programming. The effectiveness of the proposed algorithm was verified using operation data generated using a simulator for a food manufacturing process.
Commonly adopted in the manufacturing and aerospace sectors, digital twin (DT) platforms are increasingly seen as a promising paradigm to control and monitor software-based, "open", communication systems, wh...
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ISBN:
(纸本)9781538674628
Commonly adopted in the manufacturing and aerospace sectors, digital twin (DT) platforms are increasingly seen as a promising paradigm to control and monitor software-based, "open", communication systems, which play the role of the physical twin (PT). In the general framework presented in this work, the DT builds a Bayesian model of the communication system, which is leveraged to enable core DT functionalities such as control via multi-agent reinforcement learning (MARL) and monitoring of the PT for anomaly detection. We specifically investigate the application of the proposed framework to a simple case-study system encompassing multiple sensing devices that report to a common receiver. The Bayesian model trained at the DT has the key advantage of capturing epistemic uncertainty regarding the communication system, e.g., regarding current traffic conditions, which arise from limited PT-to-DT data transfer. Experimental results validate the effectiveness of the proposed Bayesian framework as compared to standard frequentist model-based solutions.
Nowadays, the increasing trend toward digitalization has driven the extensive adoption of collaborative robotic automation across industries, yet a significant limitation is the robots' adaptability to unexpected ...
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ISBN:
(纸本)9798350330946;9798350330953
Nowadays, the increasing trend toward digitalization has driven the extensive adoption of collaborative robotic automation across industries, yet a significant limitation is the robots' adaptability to unexpected and dynamic environments. This research introduces a Digital Twin (DT)-based Transfer learning (TL) approach that combines DTs and Machine learning (ML) to enhance adaptability in collaborative robot systems. The proposed system uses DT cyberspace for pre-training ML algorithms and leverages TL to apply this knowledge to real-world applications. This innovative approach efficiently trains state-of-the-art ML models, delivering exceptional performance while reducing the required time and data resources. The proof-of-concept experiments, employing the proposed DT-based TL to control soccer robots, demonstrate a remarkable 96% reduction in training time while maintaining a high level of adaptability, achieving a 70% goal accuracy rate in dynamic scenarios.
With the paradigm shift from traditional communication systems to machine learning-driven communication systems, deep learning-based semantic communication is considered as a potential approach to improve transmission...
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ISBN:
(纸本)9798350333077
With the paradigm shift from traditional communication systems to machine learning-driven communication systems, deep learning-based semantic communication is considered as a potential approach to improve transmission efficiency. However, the time-varying and multipath effects of wireless channels significantly influence the performance of existing semantic communication systems. The conventional solutions to overcome channel impairments, i.e., pilot-driven channel estimation and channel equalization approaches, will complicate the system and introduce extra overhead. Therefore, this paper proposes a deep learning-driven pilot-free semantic communication framework for frequency-selective fading channels. The convolutional neural network-based channel feature extraction and data recovery modules are introduced in the receiver to implicitly extract channel information directly from the received signal and recover the semantic information. The simulation demonstrates that the proposed network can be applied to various frequency-selective fading channels and outperforms existing schemes in terms of computational complexity and semantic transmission accuracy.
The goal of this paper is to investigate modelfree data-drivencontrol design strategies for unknown systems. In particular, we report new data-driven linear matrix inequalities (LMIs) and dynamic programming (DP) met...
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ISBN:
(数字)9781665495721
ISBN:
(纸本)9781665495721
The goal of this paper is to investigate modelfree data-drivencontrol design strategies for unknown systems. In particular, we report new data-driven linear matrix inequalities (LMIs) and dynamic programming (DP) methods. Both continuous-time and discrete-time systems are considered. We consider data transition equations that include complete information on the system model using state-input trajectories. Instead of computing explicit system model, the data transition equations are used to construct data-dependent LMI and DP formulations. The proposed formulations provide additional insights in data-drivencontrol designs. In addition, we regard the proposed methods as a complement rather than replacement of existing methods.
datadriven dynamic security assessment using Machine learning (ML) models based on advanced artificial intelligence techniques plays a very important role in the field of power systems. database robustness (redundant...
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data-driven predictive control methods based on the Willems' fundamental lemma have shown great success in recent years. These approaches use receding horizon predictive control with nonparametric data-driven pred...
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data-driven predictive control methods based on the Willems' fundamental lemma have shown great success in recent years. These approaches use receding horizon predictive control with nonparametric data-driven predictors instead of model-based predictors. This study addresses three problems of applying such algorithms under unbounded stochastic uncertainties: 1) tuning-free regularizer design, 2) initial condition estimation, and 3) reliable constraint satisfaction, by using stochastic prediction error quantification. The regularizer is designed by leveraging the expected output cost. An initial condition estimator is proposed by filtering the measurements with the one-step-ahead stochastic data-driven prediction. A novel constraint-tightening method, using second-order cone constraints, is presented to ensure high-probability chance constraint satisfaction. Numerical results demonstrate that the proposed methods lead to satisfactory control performance in terms of both control cost and constraint satisfaction, with significantly improved initial condition estimation. Copyright (c) 2024 The Authors.
Model uncertainty presents significant challenges in vibration suppression of multi-inertia systems, which often rely on inaccurate nominal mathematical models due to system identification errors or unmodeled dynamics...
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ISBN:
(纸本)9798350358513;9798350358520
Model uncertainty presents significant challenges in vibration suppression of multi-inertia systems, which often rely on inaccurate nominal mathematical models due to system identification errors or unmodeled dynamics. An observer, such as an extended state observer (ESO), can estimate the discrepancy between the inaccurate nominal model and the true model, thus improving control performance via disturbance rejection. Conventional observer design is memoryless;once the estimated disturbance is obtained and sent to the controller, the data is discarded. In this paper, we propose a learningenabled ESO (L-ESO) with seamless integration of ESO and machine learning. The machine learning model attempts to predict the disturbance, using prior information to help the observer achieve faster convergence in disturbance estimation. Additionally, any imperfections in the machine learning model can be compensated for by the ESO, providing an assurance layer. We validated the effectiveness of this novel learningfor-control paradigm through simulation and physical tests on two-inertial motion controlsystems used for vibration studies. Video: https://***/OUerJ4w_esk
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