检索结果-内蒙古大学图书馆

control Technology and Applications (CCTA),

作者： Nathan Goulet Beshah Ayalew Matthew Castanier Annette Skowronska International Center for Automotive Research (CU-ICAR) The Applied Dynamics & Control Group at Clemson University Greenville SC USA The US Army DEVCOM Ground Vehicle Systems Center (GVSC) Warren MI USA

Teams of unmanned (aerial and/or ground) vehicles offer opportunities to extend mission or task capabilities and safety within resource constrained environments. For large scale missions, covering large areas and/or a long span of time, these teams are limited by the individual vehicle’s range. To extend the overall team range in situations where fixed refueling/recharging stations are not feasible or cost effective, we propose incorporating a mobile charging host vehicle into the team of unmanned vehicles. We build on variants of the vehicle routing problem to pose the corresponding charge scheduling and routing problem. Therein, we update the mission plan for worker vehicles by incorporating rendezvous with a mobile charging host in order to optimize total team energy utilization, while minimizing mission delay and accounting for variable power charging protocols. Compared to a rule-based charge scheduler, our proposed optimization scheme realizes up to an 8% reduction in energy consumption and upwards of a 60% reduction in mission delay.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Neural Network Training Using Closed-Loop Data: Hazards and an Instrumental Variable (IVNN) Solution

引用

IFAC-PapersOnLine 2022年第12期55卷 182-187页

作者： Johan Kon Marcel Heertjes Tom Oomen Control Systems Technology Group Departement of Mechanical Engineering Eindhoven University of Technology P.O. Box 513 5600 MB Eindhoven The Netherlands ASML Mechatronics System Development Veldhoven The Netherlands Delft Center for Systems and Control Delft University of Technology P.O. Box 5 2600 AA Delft The Netherlands

An increasing trend in the use of neural networks in control systems is being observed. The aim of this paper is to reveal that the straightforward application of learning neural network feedforward controllers with closed-loop data may introduce parameter inconsistency that degrades control performance, and to provide a solution. The proposed method employs instrumental variables to ensure consistent parameter estimates. A nonlinear system example reveals that the developed instrumental variable neural network (IVNN) approach asymptotically recovers the optimal solution, while pre-existing approaches are shown to lead to inconsistent estimates.

关键词： Feedforward control instrumental variables neural networks

来源：评论

学校读者我要写书评

暂无评论

Discrete Sliding Mode Predictive control of Networked control systems

Discrete Sliding Mode Predictive Control of Networked Contro...

引用

Chinese control Conference (CCC)

作者： Chuanguo Chi Guo-Ping Liu Clara-Mihaela Ionescu Center for Control Theory and Guidance Technology Harbin Institute of Technology Harbin P. R. China Ghent University Research group on Dynamical Systems and Control Ghent Belgium Center for Control Science and Technology Southern University of Science and Technology Shenzhen P. R. China

This article studies the application of discrete sliding mode predictive control (SMPC) in networked control systems, introducing sliding mode control (SMC) into model predictive control (MPC), and prediction the state and output vector based on sliding mode control. By combining the strong robustness of sliding mode control and the advantage of model predictive control in dealing with communication constraints in network control, an incremental SMPC trajectory tracking control scheme based on a state observer is designed. The effectiveness and practicability of the designed control scheme is verified by tracking experiments on reference inputs in a dSPACE-based networked lighting control system.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Rupture of a surfactant-laden draining thin film

引用

Physical Review Fluids 2024年第7期9卷 074004-074004页

作者： Atul S. Vivek Ranabir Dey Harish N. Dixit Control Actuation Systems Group Vikram Sarabhai Space Center Indian Space Research Organisation Thiruvananthapuram 695022 India Department of Mechanical and Aerospace Engineering Indian Institute of Technology Hyderabad Kandi Sangareddy Telangana 502285 India Centre for Interdisciplinary Programs Indian Institute of Technology Hyderabad Kandi Sangareddy Telangana 502285 India

Surfactant-laden thin liquid films overlaid on solid substrates are encountered in a variety of industrial and biological settings. As these films reach submicron thickness, they tend to become unstable owing to the influence of long-range dispersion forces. In the current study, we investigate how gravitational drainage affects the stability attributes of such thin liquid films. Using scaling arguments, we demonstrate that gravity and dispersion forces can exert their influence simultaneously over a wide range of film thicknesses. In the lubrication limit, we carry out linear stability analysis and nonlinear simulations to understand the evolution of draining thin films. Linear stability indicates the existence of two unstable modes and two cutoff wave numbers, as opposed to a single unstable mode and a unique cutoff wave number observed in stationary films. It is also found that surfactant-laden flowing films are more stable than stationary films with surfactants as well as draining films with clean interfaces. The origin of stabilization is identified as the enhanced surfactant perturbations generated due to drainage. We demonstrate that films exhibiting intermediate levels of surfactant activity and significant drainage exhibit the lowest rates of disturbance growth, leading to extending the time of rupture.

关键词： Instability of free-surface flows Lubrication theory Thin fluid films Van der Waals interaction

来源：评论

学校读者我要写书评

暂无评论

research on the Method of Improving the Accuracy of Calculation of Power Flow in Western Mongolia

Research on the Method of Improving the Accuracy of Calculat...

引用

Energy, Electrical and Power Engineering (CEEPE), International Conference on

作者： Hongbo Li Jianguo Shi Shun Yao Chen Zhang Jun Liu Ye Zhang Xiaoxin Sun Inner Mongolia Power(Group) Co. Ltd. Inner Mongolia Power Dispatching Control Center Hohhot China Nari Technology Nanjing Control Systems Co. Ltd Nanjing China Inner Mongolia Power(Group) Co. Ltd. Inner Mongolia Electric Power Economic and Technical Research Institute Hohhot China

ISBN: (数字)9798350375794

ISBN: (纸本)9798350375800

The dispatching control system of smart grid in Mengxi Power Grid generally takes the actual output of new energy to participate in the calculation of future power generation and consumption balance. The main reason for not using new energy forecast is that on the one hand, the deviation of ultra-short-term new energy forecast is large, on the other hand, the current large-scale construction of new energy is connected to the grid, and the new energy access mode of regional power grid is very complicated. The above factors may lead to inaccurate bus load prediction in local areas, and the adoption of new energy forecast data will also lead to large deviation in local area calculation of future state power flow, which will affect real-time security dispatch of power grid. This paper studies how to reduce the deviation between the calculation results of future state power flow and actual power flow and improve the accuracy of real-time planning power flow calculation from the aspects of small unit modeling and participating in safety check calculation method. The empirical results show that the modeling and participating in safety check calculation method of small unit has significantly improved the accuracy of future state power flow calculation results under complex access of large-scale new energy, which strongly supports the market clearing calculation.

关键词： Adaptation models Accuracy Predictive models Real-time systems Safety Smart grids Security

来源：评论

学校读者我要写书评

暂无评论

ITSC Fault Detection in Induction Motor using a Cosine Filter and a CNN Architecture

ITSC Fault Detection in Induction Motor using a Cosine Filte...

引用

IEEE International Autumn Meeting on Power, Electronics and Computing (ROPEC)

作者： Carlos Morales-Perez Juan Pablo Amezquita-Sanchez Martin Valtierra-Rodriguez Jose Rangel-Magdaleno Jorge Cerezo-Sanchez Ambrosio Leon-Bonilla ENAP-Research Group CA-Sistemas Dinamicos y Control Facultad de Ingenieria Universidad Autonoma de Queretaro (UAQ) Campus San Juan del Rio Queretaro Mexico Electronics Department-Digital Systems Group Instituto Nacional de Astrofisica Optica y Electronica Puebla Mexico Division of Mechatronics Engineering Universidad Tecnologica de Puebla Puebla Mexico

ISBN: (数字)9798331530525

ISBN: (纸本)9798331530532

Detecting faults in rotating electrical machinery is necessary due to current industrial demands. This is because operations of these machines with unattended faults can lead to high electricity consumption, operational inefficiency, and unexpected breakdowns in the worst cases. One of the most common faults in induction motors tends to be stator faults, specifically the inter-turn short circuit (ITSC), which typically do not exhibit apparent symptoms in the early stages. However, these faults can be detected without physical motor intervention, as spectral signatures of faults can be identified through phase current measurements. In this way, only the sensors’ installation in the motor phase is needed to diagnose the motor health correctly. The challenge lies in selecting and designing an appropriate methodology for these purposes. So, this study introduces a technique based on constructing images from current signals, where the fundamental frequency has been suppressed to highlight fault spectral signatures. These generated images are subsequently fed into a convolutional neural network (CNN), which develops a classification stage according to the given features of the fault conditions in previous training stages, allowing the identification of the ITSC fault. Finally, tests were conducted under three mechanical loading conditions and four short-circuit damage conditions in the stator, achieving an accuracy of 98.62 %.

关键词： Training Fault diagnosis Accuracy Induction motors Computer architecture Stators Robustness Real-time systems Circuit faults Convolutional neural networks

来源：评论

学校读者我要写书评

暂无评论

Space Life Support Engineering and Biomechatronics Towards the Moon and Mars: A Scoping Review

Space Life Support Engineering and Biomechatronics Towards t...

引用

International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT)

作者： Jose Cornejo Mariela Vargas Milton V. Rivera Ricardo Palomares Ricardo Barreto Jorge Cornejo Universidad Tecnologica del Peru Lima Peru Institute of Research in Biomedical Sciences (INICIB) Universidad Ricardo Palma Lima Peru Center for Space Systems (C-SET) Institute of Research in Biomedical Sciences (INICIB) Lima Peru Research Group of Advanced Robotics and Mechatronics (GI-ROMA) Universidad Ricardo Palma Lima Peru National University of Engineering Lima Peru

ISBN: (数字)9798350354423

ISBN: (纸本)9798350354430

Manned travel to and colonization of the Moon and Mars demand a comprehensive approach that extends far beyond the ability to transport humans on powerful rockets and spacecraft. The sustain ability of human life in these hostile environments is a critical consideration, prompting extensive research to understand how humans might survive and establish themselves beyond Earth. Therefore, this article covers a scoping review, and a point of view of the most relevant published papers is analyzed. The results reveal that the continuous evolution of medical technology and risk analysis have facilitated improved design, research, and development in crucial areas such as engineering and biomedical sciences. Space life support encompasses three fundamental issues: human health and performance, environmental control and habitability, and radiation risks. These aspects are pivotal in ensuring the survival and well-being of astronauts during extended missions in space, which are critical to overcome the technological and biological challenges posed by exploring and colonizing extraterrestrial environments. In addition, the significant challenges associated with manned travel and colonization of other celestial objects underscore the need for continued innovation and collaboration across various scientific and engineering disciplines. Finally, as technological and scientific advancements continue, the prospect of colonizing the Moon and Mars becomes increasingly achievable, paving the way for the next chapter in human exploration and expansion into the cosmos.

关键词： Mars Technological innovation Reviews Space missions Telemedicine Moon Aerospace electronics Water conservation Sustainable development Medical diagnostic imaging

来源：评论

学校读者我要写书评

暂无评论

Learning Stable and Robust Linear Parameter-Varying State-Space Models

Learning Stable and Robust Linear Parameter-Varying State-Sp...

引用

IEEE Conference on Decision and control

作者： Chris Verhoek Ruigang Wang Roland Tóth Control Systems Group Eindhoven University of Technology The Netherlands Australian Centre for Robotics School of Aerospace Mechanical and Mechatronic Engineering The University of Sydney Australia Vehicle Industry Research Center Szechenyi Istvan University Hungary

This paper presents two direct parameterizations of stable and robust linear parameter-varying state-space (LPV-SS) models. The model parametrizations guarantee a priori that for all parameter values during training, the allowed models are stable in the contraction sense or have their Lipschitz constant bounded by a user-defined value $\gamma$ . Furthermore, since the parametrizations are direct, the models can be trained using unconstrained optimization. The fact that the trained models are of the LPV-SS class makes them useful for, e.g., further convex analysis or controller design. The effectiveness of the approach is demonstrated on an LPV identification problem.

关键词：

来源：评论

学校读者我要写书评

暂无评论

引用

15th International Conference on Dynamical systems: Theory and Applications, DSTA 2019

作者： Dulf, Eva-H. Ionescu, Clara-M. Technical University of Cluj-Napoca Cluj Napoca Romania Obuda University Physiological Controls Research Center Budapest Hungary Dynamical Systems and Control Research Group Ghent University Ghent Belgium EEDT Core Lab on Decision and Control Flanders Make Consortium Ghent Belgium

ISBN: (纸本)9783030773090

Stroke is a medical condition which can easily affect the quality of life, depending on how extended the stroke is and what regions of the brain are involved. According to the most recent data cited in WHO, Romania is in top three of the countries with increased frequency of stroke and has the second place for having the most deaths and disabilities caused by stroke. Actually, stroke is the second death cause in Romania after cardiac arrest. Today, there are various prevention methods concerning stroke. The hypothesis of the research context is that EEG signal can provide useful information on risk related prediction for recurrent stroke and post-stroke epilepsy. Knowing that there is a certain risk on developing secondary epilepsy after stroke, based on the EEG rhythms, may help in prevention and maybe in reconsidering a new approach in the treatment of this pathology. On the other hand Fractional Fourier Transform (FrFT), a generalization of conventional Fourier Transform, is used with success in many applications like detection of signals in noise, image compression, reduction of side lobe levels using convolutional windows, time-frequency analysis, etc. It can be used in more effective manner compared to Fourier transform with additional degrees of freedom. That was the motivation to analyze the spectra of each component of the EEG signals using FrFT in order to predict recurrent stroke and post-stroke epilepsy incidence. The results prove the efficiency of the method. © 2021, Springer Nature Switzerland AG.

关键词： Fourier transforms

来源：评论

学校读者我要写书评

暂无评论

Adaptive Discrete Sliding-mode Predictive control of Networked Multi-agent control System Based on the Incremental Model

Adaptive Discrete Sliding-mode Predictive Control of Network...

引用

Fully Actuated System Theory and Applications (CFASTA), Conference on

作者： Chuanguo Chi Guo-Ping Liu Clara-Mihaela Ionescu Center for Control Theory and Guidance Technology Harbin Institute of Technology Harbin P. R. China Research group on Dynamical Systems and Control Tech Lane Science Park 125 Ghent University Ghent Belgium Center for Control Science and Technology Southern University of Science and Technology Shenzhen P. R. China

Sliding mode predictive control (SMPC) is a control method that combines sliding mode control (SMC) and mode predictive control (MPC). It has broad application prospects in networked multi-agent control system (NMACS) due to its strong robustness, good response speed, and anti-interference ability. Discrete sliding mode variable structure control based on discrete systems has the advantages of SMPC, but due to the influence of discrete reaching law and sampling period of discrete systems, the system control often exhibits chattering. To overcome the chattering problem of SMPC, this paper designs an adaptive discrete sliding mode predictive control (ADSMPC) scheme based on incremental models, and by designing a leader-follower scheme achieved consistency control of multiple agents. The effectiveness of the control scheme is verified through multi-agents trajectory tracking experiments of a networked multi-lighting control system based on a dSPACE controller.

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：