检索结果-内蒙古大学图书馆

SSRN 2024年

作者： Lehmann, Dustin Laidig, Daniel Bachhuber, Simon Seel, Thomas Weygers, Ive Control Systems Group Technische Universität Berlin Berlin10587 Germany Institute of Mechatronic Systems Leibniz Universität Hannover Hannover30167 Germany Department Artificial Intelligence in Biomedical Engineering FAU Erlangen-Nürnberg Erlangen91052 Germany

Various biomechanical, robotic, and industrial applications require accurate measurements of the relative motion in connected kinematic chains. However, magnetic disturbance in the environment usually limits the accuracy of conventional estimation algorithms. We propose a generic approach to magnetometer-free inertial motion tracking (IMT) of kinematic chains with arbitrary number of segments and joint types in unconstrained environments. The missing magnetometer information is substituted by a combination of multiple constraints resulting in one generic solution for different kinematic chains. We do so by leveraging a unique magnetometer-free coordinate system definition that reduces the missing magnetometer information into a single parameter per kinematic pair, the heading offset. A combination of kinematic constraints for heading offset tracking into a single optimization problem is complemented with a state-of-the-art inclination estimation method to obtain generic long-term stable and drift-free IMT of all relative orientations. Extensive experimental evaluation demonstrates that constraint-based magnetometer-free IMT consistently outperforms widely employed magnetometer-aided IMT approaches with a mean RMSE of 1.9 degrees. Moreover, the proposed method effectively addresses previously unmet scenarios of practical relevance where singular conditions arise. The proposed method improves IMT and simplifies it for non-expert users across various applications. © 2024, The Authors. All rights reserved.

关键词： Kinematics

来源：评论

学校读者我要写书评

暂无评论

Performance Evaluation of State and Output Feedback-based Repetitive controllers for Rotational control systems

Performance Evaluation of State and Output Feedback-based Re...

引用

International Conference on Radar, Antenna, Microwave, Electronics, and Telecommunications (ICRAMET)

作者： Akif Rahmatillah Edi Kurniawan Aulia Siti Aisjah Katherin Indriawati Dept. of Engineering Physics Faculty of Industrial Technology & Systems Engineering Sepuluh Nopember Institut of Technology Surabaya Indonesia Research Group of Precision Control & Measurement Research Centre for Photonics National Research and Innovation Agency Tangerang Selatan Indonesia

ISBN: (数字)9798350389920

ISBN: (纸本)9798350389937

This study examines the tracking performance of state and output feedback-based repetitive controllers (RCs) for rotational control systems. First, a state feedback RC is designed in the time domain using a state-space model, which requires full state information for implementation. The state feedback RC is modeled as a 2D hybrid system, where the control and learning actions can be designed independently using Linear Matrix Inequality (LMI) solutions. This approach is evaluated on a rotational control system expressed as a strictly proper linear system with a relative degree of 1. Second, for comparison, an output feedback RC, also known as a general RC, is designed for the same system. Numerical experiment results show that while the state feedback RC achieves lower peak and root-means-quare errors, it exhibits slower transient response compared to the output feedback RC.

关键词： Microwave antennas State feedback Transient response Velocity control control systems Radar antennas Telecommunications Time-domain analysis Output feedback Convergence

来源：评论

学校读者我要写书评

暂无评论

Context-Aware control for Quality Improvement in Liquid Steel Manufacturing

Context-Aware Control for Quality Improvement in Liquid Stee...

引用

control Technology and Applications (CCTA),

作者： Isabela R. Birs Cristina I. Muresan Mircea Susca Vlad Mihai Mihaly Mihaela Ghita Maria Ghita Robin De Keyser Clara Ionescu Research Group of Dynamical Systems and Control Faculty of Engineering and Architecture Ghent University EEDT Decision & Control Flanders Make Consortium Ghent Belgium Department of Automation Technical University of Cluj Napoca Cluj-Napoca Romania

This paper presents an original theoretical and implementation framework of fractional order event-based control with the purpose of quality improvement at the end production line of a continuous casting process. A real-life steel manufacturing plant is taken into consideration in the study. A prior fractional order model is considered to tune a fractional order Proportional Integral controller that ensures an ideal flow velocity of liquid steel. A novel event-based fractional order methodology is proposed that uses internal and external process events in order to improve quality . The implementation strategy takes into consideration available software and hardware components at the plant site, offering a realistic and implementable solution, highly suitable for the current steel industry setting. Numeric simulations successfully validate the proposed methodology.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Network Fundamental Diagram based Dynamic Routing in a Clustered Network

Network Fundamental Diagram based Dynamic Routing in a Clust...

引用

International Conference on Models and Technologies for Intelligent Transportation systems (MT-ITS)

作者： Yunfei Zhang Felix Rempe Florian Dandl Gabriel Tilg Matthias Kraus Klaus Bogenberger Department of Mobility Systems Engineering Chair of Traffic Engineering and Control Technical University of Munich Munich Germany BMW Group Munich Germany Institute for Advanced Study Technical University of Munich Garching Germany

Dynamic routing algorithms aim to find the shortest (fastest in most cases) path in a road network prone to timedependent traffic states. Conventional approaches assume the availability of link-level travel time data. Due to the limited number of sensors in real road networks, for large parts of a road network often no travel time data are available. Linklevel travel times are therefore often estimated as constants. Consequently, predicted travel times and routes are not accurate, especially under congested traffic conditions. In this paper, we develop a macroscopic routing algorithm in a clustered network based on loop detector data. Traffic speeds in each cluster are assumed to scale homogeneously and are estimated based on the cluster-specific network fundamental diagrams. A macroscopic routing approach is implemented, which reduces the complexity of finding an optimal path. As a result, missing link-level data are imputed with an expected traffic state in each cluster based on the fundamental diagram. Preprocessed routing information within the clusters and a macroscopic network lead to fast route computations. The approach is evaluated from two sides. Using one month of processed empirical trajectory data collected from a large fleet of vehicles in Munich, our predicted travel times are proved to be more accurate compared to a baseline routing algorithm and a one-cluster (network) method. Re-routing can also be observed from free-flow routes using synthesized trips, showing that our macroscopic routing algorithm is capable of avoiding congested clusters.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Evaluation of Magnet Configurations for Magnetohydrodynamic Trajectory control during Planetary Entry

Evaluation of Magnet Configurations for Magnetohydrodynamic ...

引用

AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Fawley, Destiny M. Eggl, Siegfried Putnam, Zachary R. D’souza, Sarah Borner, Arnaud University of Illinois at Urbana-Champaign Department of Aerospace Engineering 104 S. Wright St. UrbanaIL61801 United States Johns Hopkins Applied Physics Laboratory Astrodynamics and Control Group LaurelMD20723 United States NASA Ames Research Center Entry Systems and Vehicle Development Branch Moffett FieldCA94035 United States AMA Inc. NASA Ames Research Center Thermal Protection Materials and Systems Branch MS 234-1 Moffett FieldCA94035 United States

ISBN: (纸本)9781624107238

Magnetohydrodynamics is a phenomenon that can be harnessed during planetary entry to augment aerodynamic drag and may enable higher mass payloads to safely reach the surface. The magnetohydrodynamic force is quantified over a wide range of freestream conditions using computational fluid dynamics results from a previous study. The force is calculated for an array of small electromagnets, a large non-superconducting magnet, a large superconducting magnet, and a uniform field. The superconducting magnet produces a magnetohydrodynamic force within an order of magnitude of aerodynamic drag for velocities higher than 10 km/s, indicating that it may have a reasonable impact on the trajectory for some cases. The array of small magnets and non-superconducting magnet produced a magnetohydrodynamic force that is less than 1% of the aerodynamic drag, so their magnetic fields are not strong enough to affect an entry trajectory. Additionally, the magnet placement plays an important role in magnetohydrodynamic force magnitude, with a magnet located near the shoulder producing approximately eight times more force than a magnet placed on the axis of symmetry. A mass and power budget for each magnet configuration is given assuming current state-of-the-art magnet technology. This study also discusses implementation challenges for each type of magnet on a spacecraft. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Aerodynamic drag

来源：评论

学校读者我要写书评

暂无评论

Modified Implicit Discretization of the Super-Twisting controller

arXiv

引用

arXiv 2023年

作者： Andritsch, Benedikt Watermann, Lars Koch, Stefan Reichhartinger, Markus Reger, Johann Horn, Martin The Institute of Automation and Control Graz University of Technology Graz Austria The Christian Doppler Laboratory for Model-Based Control of Complex Test Bed Systems Institute of Automation and Control Graz University of Technology Graz Austria The Control Engineering Group at Technische Universität Ilmenau Ilmenau Germany

In this paper a novel discrete-time realization of the super-twisting controller is proposed. The closed-loop system is proven to be globally asymptotically stable in the absence of a disturbance by means of Lyapunov theory. Furthermore, the steady-state error in the disturbed case is computed analytically and shown to be independent of the parameters. The steady-state error only depends on the sampling time and the unknown disturbance. The proposed discrete-time controller is compared to previously published discrete-time super-twisting controllers by means of the controller structure. In extensive simulation studies the proposed controller is evaluated comparative to known controllers. The continuous-time super-twisting controller is capable of rejecting any unknown Lipschitz-continuous perturbation. Furthermore, the convergence time decreases, if any of the gains is increased. The simulations demonstrate that the systems closed in the loop with each of the known controllers lose one of these properties, introduce discretization-chattering effects, or do not yield the same accuracy level as with the proposed controller. The proposed controller, in contrast, is beneficial in terms of the above described properties of the continuous-time super-twisting controller. © 2023, CC BY.

关键词： controllers

来源：评论

学校读者我要写书评

暂无评论

Recurrent Sliding Mode-Based State Observer Design for a Subset of Nonlinear systems

Recurrent Sliding Mode-Based State Observer Design for a Sub...

引用

International Conference on control, Automation, Robotics and Vision (ICARCV)

作者： Gael P. Atheupe Bhagyashri T. Gurjar Bruno Monsuez Renault Group and IP Paris Guyancourt FRANCE Department of Aerospace Engineering Intelligent Systems & Control Lab Indian Institute of Technology Bombay Mumbai India Computer science & systems engineering Lab (U2IS) of ENSTA Paris Institute Poly-technique de Paris (IP Paris) Palaiseau FRANCE

ISBN: (数字)9798331518493

ISBN: (纸本)9798331518509

This paper introduces a novel Sliding Mode-Based Observer tailored for a specific subset of nonlinear systems of order $\boldsymbol n$ featuring Lipschitz nonlinearities. The study establishes stability conditions that ensure convergence of the estimation error (s) in finite time until order $\boldsymbol n$ , thus, providing an accurate state (s) estimation without the necessity for disturbance matching conditions. Furthermore, the study presents an extension of the scope of application of the proposed method to tackle a unique scenario characterized by a time-varying and non-invertible function of the output dynamics of the system model. The effectiveness of the proposed observer is showcased through simulation examples.

关键词： Estimation error Automation Accuracy Observers Stability analysis Nonlinear dynamical systems Time-varying systems Robots Convergence

来源：评论

学校读者我要写书评

暂无评论

Orthogonal On-Rotor Sensing Vibrations for Condition Monitoring of Rotating Machines

引用

Journal of Dynamics, Monitoring and Diagnostics 2022年第1期1卷 29-36页

作者： Yuandong Xu Xiaoli Tang Guojin Feng Dong Wang Craig Ashworth Fengshou Gu Andrew D.Ball Dynamics Group Department of Mechanical EngineeringImperial College LondonLondonUK School of Engineering and Technology Aston UniversityBirminghamUK School of Mechanical Engineering Hebei University of TechnologyTianjinChina State Key Laboratory of Mechanical Systems and Vibration Shanghai Jiao Tong UniversityChina Control System Integration Ltd LittleboroughUK Centre for Efficiency and Performance Engineering University of HuddersfieldHuddersfieldUK

Thanks to the fast development of micro-electro-mechanical systems(MEMS)technologies,MEMS accelerometers show great potentialities for machine condition *** overcome the problems of a poor signal to noise ratio(SNR),complicated modulation,and high costs of vibration measurement and computation using conventional integrated electronics piezoelectric accelerometers,a triaxialMEMS accelerometer-based on-rotor sensing(ORS)technology was developed in this *** wireless data transmission capability,the ORS unit can be mounted on a rotating rotor to obtain both rotational and transverse dynamics of the rotor with a high *** orthogonal outputs lead to a construction method of analytic signals in the time domain,which is versatile in fault detection and diagnosis of rotating *** case studies based on an induction motor were carried out,which demonstrated that incipient bearing defect and half-broken rotor bar can be effectively diagnosed by the proposed measurement and analysis ***,vibration signals from translational on-casing accelerometers are less capable of detecting such *** demonstrates the superiority of the ORS vibrations in fault detection of rotating machines.

关键词： On-rotor sensing vibration condition monitoring rotating machines

来源：评论

学校读者我要写书评

暂无评论

Convergence of energy-based learning in linear resistive networks

arXiv

引用

arXiv 2025年

作者： Huijzer, Anne-Men Chaffey, Thomas Besselink, Bart van Waarde, Henk J. Bernoulli Institute for Mathematics Computer Science and Artificial Intelligence University of Groningen Groningen Netherlands CogniGron - Groningen Cognitive Systems and Materials Center Netherlands Control Group Department of Engineering University of Cambridge United Kingdom School of Electrical and Computer Engineering University of Sydney Australia

Energy-based learning algorithms are alternatives to backpropagation and are well-suited to distributed implementations in analog electronic devices. However, a rigorous theory of convergence is lacking. We make a first step in this direction by analysing a particular energy-based learning algorithm, Contrastive Learning, applied to a network of linear adjustable resistors. It is shown that, in this setup, Contrastive Learning is equivalent to projected gradient descent on a convex function, for any step size, giving a guarantee of convergence for the *** Codes 65K10, 68T05, 93B30, 93D99 © 2025, CC BY-SA.

关键词： Contrastive Learning

来源：评论

学校读者我要写书评

暂无评论

Enhancing Stability and Performance of Hybrid Offshore Wind Platforms: A Novel Fuzzy Logic control Approach with Computational Machine Learning

Enhancing Stability and Performance of Hybrid Offshore Wind ...

引用

International Conference on control, Mechatronics and Automation (ICCMA)

作者： Irfan Ahmad Fares M'zoughi Payam Aboutalebi Izaskun Garrido Aitor J. Garrido Automatic Control Group - ACG Department of Automatic Control and Systems Engineering Engineering School of Bilbao - EIB/BIE University of the Basque Country - UPV/EHU Bilbao Spain Department of Marine Technology Norwegian University of Science and Technology (NTNU) Moholt Trondheim Norway

Harnessing the power of wind and waves for renewable energy production has become vital in the quest for sustainable electricity generation. The fusion of Floating Offshore Wind Turbines (FOWTs) and Oscillating Water Columns (OWCs) has introduced a groundbreaking concept of hybrid offshore platforms, offering immense potential for energy absorption, reduced dynamic response, load mitigation, and improved cost efficiency. The primary goals of this study revolve around two key objectives: (i) the development of a regression-based modeling technique for the hybrid aero-hydro-elastic-servo-mooring coupled numerical system, and (ii) the implementation of a customized fuzzy-based control mechanism to ensure platform stability. To achieve these objectives, computational Machine Learning (ML) tools, specifically Artificial Neural Networks (ANNs), are utilized to replicate the behavior of the detailed numerical model of the FOWTs integrated with OWCs. Subsequently, a Fuzzy Logic control (FLC) scheme is employed to establish a structural controller that effectively mitigates unwanted vibrations. The experimental results confirm the potential of ANN-based modeling as a simpler yet effective alternative to complicated nonlinear NREL-5MW FOWT dynamical models. Furthermore, the use of the FLC system enhances platform stability in a variety of wind and wave conditions.

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：