检索结果-内蒙古大学图书馆

Methods for a Transparent Development and Optimization of Biotechnological Processes

IFAC Proceedings Volumes 1996年第1期29卷 6768-6773页

作者： Peter Marenbach Kurt Dirk Bettenhausen Henning Tolle Darmstadt University of Technology Institute of Control Engineering Department of Control Systems Theory & Robotics Landgraf-Georg-Strasse 4 D-64283 Darmstadt Germany URL: http //www.rt.e-technik.th-darmstadt.de

The article at hand describes an integrating system for the intelligent control of complex bio technological processes including automatic modelling and model based control strategy generation. Starting with a summary of previously achieved results, some new approaches that provide better transparency to process engineers and operators are discussed. This includes aspects of self-organizing generation of structured dynamic nonlinear process models based upon the ideas of genetic programming as well as the transparent generation of fuzzy rules in a particular NeuroFuzzy approach. The latter is used for the classification of physiological states during batch and fed-batch fermentations and for the long time strategy generation to optimize the achievable product yield.

关键词： Biotechnology Process control Fuzzy systems Learning control Genetic algorithms

来源：评论

学校读者我要写书评

暂无评论

Dynamics identification of a damped multi elastic link robot arm under gravity

Dynamics identification of a damped multi elastic link robot...

引用

IEEE International Conference on robotics and Automation (ICRA)

作者： Jörn Malzahn Rene Felix Reinhart Torsten Bertram Institute of Control Theory and Systems Engineering Technische Universität Dortmund Dortmund Germany Research Institute of Cognition & Robotics — CoR-Lab. Bielefeld University Bielefeld Germany

The infinite dimensionality, varying, uncertainties or even unknown boundary conditions render the derivation and - in particular - the identification of accurate dynamics models for elastic link robots tedious and error prone. This contribution circumvents these challenges by the prior application of a model-free inner loop oscillation damping controller before modelling the robot's dynamics. Then, the damped dynamics of a multi elastic link robot arm under gravity can be modelled with high accuracy. An analytical and a data-driven model for the damped dynamics are proposed and quantitatively compared. Both models can explain motor currents as well as link strain measurements in real-time. The paper includes an experimental model validation with different payloads in the entire workspace of the robot.

关键词： Joints Torque Strain Robots Payloads Oscillators Analytical models

来源：评论

学校读者我要写书评

暂无评论

EXPLOITING EQUIVARIANCE IN THE DESIGN OF TRACKING controlLERS FOR EULER-POINCARE SYSTEMS ON MATRIX LIE GROUPS

arXiv

引用

arXiv 2024年

作者： Hampsey, Matthew Banavar, Ravi van Goor, Pieter Mahony, Robert Systems Theory and Robotics Group Australian National University ACT2601 Australia Interdisciplinary Programme in Systems and Control Engineering Indian Institute of Technology Bombay India

The trajectory tracking problem is a fundamental control task in the study of mechanical systems. A key construction in tracking control is the error or difference between an actual and desired trajectory. This construction also lies at the heart of observer design and recent advances in the study of equivariant systems have provided a template for global error construction that exploits the symmetry structure of a group action if such a structure exists. Hamiltonian systems are posed on the cotangent bundle of configuration space of a mechanical system and symmetries for the full cotangent bundle are not commonly used in geometric control theory. In this paper, we propose a group structure on the cotangent bundle of a Lie-group and leverage this to define momentum and configuration errors for trajectory tracking drawing on recent work on equivariant observer design. We show that this error definition leads to error dynamics that are themselves "Euler-Poincare like" and use these to derive simple, almost global trajectory tracking control for fully-actuated Euler-Poincare systems on a Lie-group state space. Copyright © 2024, The Authors. All rights reserved.

关键词： Lie groups

来源：评论

学校读者我要写书评

暂无评论

Lipschitz-Bounded 1D Convolutional Neural Networks using the Cayley Transform and the controllability Gramian

Lipschitz-Bounded 1D Convolutional Neural Networks using the...

引用

IEEE Conference on Decision and control

作者： Patricia Pauli Ruigang Wang Ian R. Manchester Frank Allgöwer Institute for Systems Theory and Automatic Control University of Stuttgart Stuttgart Germany Australian Centre for Robotics School of Aerospace Mechanical and Mechatronic Engineering The University of Sydney Australia

We establish a layer-wise parameterization for 1D convolutional neural networks (CNNs) with built-in end-to-end robustness guarantees. In doing so, we use the Lipschitz constant of the input-output mapping characterized by a CNN as a robustness measure. We base our parameterization on the Cayley transform that parameterizes orthogonal matrices and the controllability Gramian of the state space representation of the convolutional layers. The proposed parameterization by design fulfills linear matrix inequalities that are sufficient for Lipschitz continuity of the CNN, which further enables unconstrained training of Lipschitz-bounded 1D CNNs. Finally, we train Lipschitz-bounded 1D CNNs for the classification of heart arrythmia data and show their improved robustness.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A High-Precision Edge Detection Algorithm Based on Improved Sobel Operator-Assisted HED 14

A High-Precision Edge Detection Algorithm Based on Improved ...

引用

14th IEEE International Conference on Cyber Technology in Automation, control, and Intelligent Systems, CYBER 2024

作者： Yuan, Yeborui Chen, Wenyuan Tang, Jie Yang, Jia School of Electrical Engineering and Automation Tianjin University of Technology Tianjin300384 China Shenyang Institute of Automation Institutes for Robotics and Intelligent Manufacturing Chinese Academy of Sciences Shenyang State Key Laboratory of Robotics 110016 China University of Chinese Academy of Sciences Beijing100049 China School of Electrical Engineering and Automation Tianjin University of Technology Tianjin Key Laboratory for Control Theory and Applications in Complicated Systems Tianjin300384 China

ISBN: (纸本)9798331506056

In response to the problem of poor detection performance of the traditional Sobel operator in edge detection, a high-precision edge detection algorithm based on Sobel operator-assisted Holistically-nested Edge Detection (HED) network was proposed, which is named ISAHED here. The algorithm is designed as follows. Firstly, an improved Sobel operator based on the traditional Sobel operator was proposed through adding gradient direction. Then, the image output by the improved Sobel operator is taken as the ground-truth image and as the end-to-end comparison object in a HED-like network. Finally, the ISAHED algorithm outputs edge images with better quality through iterative learning of the HED-like neural network. The experimental results prove that the proposed ISAHED algorithm has better edge detection performance by visually observing the final edge images and further evaluating the values of FOM. This work provides an important reference for the further development of the edge detection technology. © 2024 IEEE.

关键词： Contrastive Learning

来源：评论

学校读者我要写书评

暂无评论

Link elasticity exploited for payload estimation and force control

Link elasticity exploited for payload estimation and force c...

引用

IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： J. Malzahn R. Schloss T. Bertram Institute of Control Theory and Systems Engineering TU Dortmund University Dortmund Germany Jorn-Malzahn is with the Department of Advanced Robotics Istituto Italiano Di Tecnologia (IIT) Genova Italy Russell Schloss and Torsten Bertram are with the Institute of Control Theory and Systems Engineering TU Dortmund University Dortmund Germany

Link elasticity is commonly understood to be a detrimental side-effect of imperfect mechanical designs of robotic arms and comparable machinery. In contrast to this notion, this paper demonstrates a novel approach to exploit intrinsic robot link compliance in order to estimate a priori unknown payload masses, measure and also control end effector forces. In this way, the intrinsic link elasticity can be seen as an enabler for new sensing and control capabilities instead of a purely detrimental effect.

关键词： Strain Payloads Force Robot sensing systems Torque Elasticity

来源：评论

学校读者我要写书评

暂无评论

Active fault tolerant control of an electro-hydraulic servo axis with a duplex-valve-system

引用

IFAC Proceedings Volumes 2010年第18期43卷 660-668页

作者： Beck Mark Schwung Andreas Muenchhof Marco Isermann Rolf TU Darmstadt Institute of Automatic Control Laboratory for Control Systems and Process automation 64283 Darmstadt Germany (Tel: +49-6151-162314) TU Darmstadt Institute of Automatic Control Laboratory for Control Theory and Robotics 64283 Darmstadt Germany (Tel: +49-6151-166283) TU Darmstadt Institute of Automatic Control Laboratory for Control Systems and Process automation 64283 Darmstadt Germany (Tel: +49-6151-163114) TU Darmstadt Institute of Automatic Control Laboratory for Control Systems and Process automation 64283 Darmstadt Germany (Tel: +49-6151-162114)

In this paper fault detection, fault diagnosis and active fault tolerant control of an electro-hydraulic servo-axis with a duplex-valve-system are described. The fault detection is based on parity equations. The semi-physical models allow the detection of even small faults in the hydraulic system. The fault diagnosis used on the testbed is based on fuzzy-logic. In order to tolerate a failed hydraulic proportional valve, a duplex-valve-system built up with standard direct-driven proportional valves is applied. The fault management module allows the supervision of the hydraulic servo axis and decides on reconfiguration and fault accomodation of the control-loop. The Internal Model control (IMC)-tracking control structure used for reconfiguration allows bumpless transfer between controllers. Experimental results show the industrial applicability of the approach.

关键词： Fault Detection Fault Diagnosis Fault Tolerance Fault Accomodation Electro-hydraulic Servo Axis Duplex-valve-system Active Fault Tolerant control Reconfiguration Bumpless-Transfer

来源：评论

学校读者我要写书评

暂无评论

Lipschitz-bounded 1D convolutional neural networks using the Cayley transform and the controllability Gramian

arXiv

引用

arXiv 2023年

作者： Pauli, Patricia Wang, Ruigang Manchester, Ian R. Allgöwer, Frank The Institute for Systems Theory and Automatic Control University of Stuttgart Stuttgart70569 Germany The Australian Centre for Robotics School of Aerospace Mechanical and Mechatronic Engineering The University of Sydney Australia

关键词： State space methods

来源：评论

学校读者我要写书评

暂无评论

LipKernel: Lipschitz-Bounded Convolutional Neural Networks via Dissipative Layers

arXiv

引用

arXiv 2024年

作者： Pauli, Patricia Wang, Ruigang Manchester, Ian Allgöwer, Frank Institute for Systems Theory and Automatic Control University of Stuttgart Stuttgart70550 Germany Australian Centre for Robotics School of Aerospace Mechanical and Mechatronic Engineering The University of Sydney Australia

We propose a novel layer-wise parameterization for convolutional neural networks (CNNs) that includes built-in robustness guarantees by enforcing a prescribed Lipschitz bound. Each layer in our parameterization is designed to satisfy a linear matrix inequality (LMI), which in turn implies dissipativity with respect to a specific supply rate. Collectively, these layer-wise LMIs ensure Lipschitz boundedness for the input-output mapping of the neural network, yielding a more expressive parameterization than through spectral bounds or orthogonal layers. Our new method LipKernel directly parameterizes dissipative convolution kernels using a 2-D Roesser-type state space model. This means that the convolutional layers are given in standard form after training and can be evaluated without computational overhead. In numerical experiments, we show that the run-time using our method is orders of magnitude faster than state-of-the-art Lipschitz-bounded networks that parameterize convolutions in the Fourier domain, making our approach particularly attractive for improving robustness of learning-based real-time perception or control in robotics, autonomous vehicles, or automation systems. We focus on CNNs, and in contrast to previous works, our approach accommodates a wide variety of layers typically used in CNNs, including 1-D and 2-D convolutional layers, maximum and average pooling layers, as well as strided and dilated convolutions and zero padding. However, our approach naturally extends beyond CNNs as we can incorporate any layer that is incrementally dissipative. Copyright © 2024, The Authors. All rights reserved.

关键词： Parameterization

来源：评论

学校读者我要写书评

暂无评论

Tools for Design and Optimal control of Production Line and Flexible Manufacturing Systems

引用

IFAC Proceedings Volumes 1997年第19期30卷 439-444页

作者： Baltazár Frankoviç Stanislava Labátová Institute of Control Theory and Robotics Slovak Academy of Sciences 842 37 Bratislava Dúbravská cesta c.9 Slovak Republic phone: +42 -7- 378 2993 fax: +42-7-376 045

Flexible manufacturing system (FMS) is a net of workstations interconnected by ways which are followed by products. This paper introduces the factors which influence the design and control of FMS and shows by using th... 详细信息

关键词： Modelling simulation decision optimization Petri nets

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：