检索结果-内蒙古大学图书馆

A Knowledge-Based Decision Support System for Micro and Nano Manufacturing Process Chains

学校读者我要写书评

暂无评论

A Knowledge-Based Decision Support System for Micro and Nano...

Euromicro Conference on Software Engineering and Advanced Applications (SEAA)

作者： Tobias Müller Veit Hagenmeyer Andreas Schmidt Steffen Scholz Ahmed Elkaseer Institute for Automation and Applied Informatics Karlsruhe Institute of Technology Eggenstein-Leopoldshafen Germany Karlsruher Institut fur Technologie Karlsruhe Baden-WÃ¼rttemberg DE Inst. for Autom. & Appl. Inf. Karlsruhe Inst. of Technol. Eggenstein-Leopoldshafen Germany Germany Faculty of Engineering Port Said Univeristy Egypt

ISBN: (纸本)9781538673843

In modern production environments, decision support systems for flexible and scalable manufacturing of functional components have become a critical issue for economic success, especially for small and medium enterprises. Knowledge-based modelling of process chains has been effectively applied to the manufacturing of macro-scale products. However, modelling and therefore the process planning of manufacturing for micro scale products with tight tolerances and high accuracy proves to be very challenging. This paper proposes a methodology to support developers work in the field of micro manufacturing technologies. In particular, support for decision making process through workflow technologies as well as an example for managing technological processes based on a capability database is presented. The ontology allows for modelling and storage of technical capabilities, supporting product developers during the initial product design phase as well as the set-up of suitable manufacturing chains by taking into account different views (materials, technologies, tools, equipment) on a production process. This enables a highly flexible production system, allowing for a fast exchange of design variants and implementation of new manufacturing modules and techniques.

关键词： Databases Tools automation Process planning Manufacturing processes

Principal Flow Patterns across renewable electricity networks

学校读者我要写书评

暂无评论

arXiv 2018年

作者： Hofmann, Fabian Schäfer, Mirko Brown, Tom Hörsch, Jonas Schramm, Stefan Greiner, Martin Frankfurt Institute for Advanced Studies Ruth-Moufang-Straße 1 Frankfurt am Main60438 Germany University of Freiburg Emmy-Noether-Strasse 2 Freiburg79110 Germany Department of Engineering Aarhus University Inge Lehmanns Gade 10 Aarhus C8000 Denmark Institute for Automation and Applied Informatics Karlsruhe Institute of Technology Eggenstein-Leopoldshafen76344 Germany

Frequency control of singularly perturbed forced duffing's oscillator

学校读者我要写书评

暂无评论

arXiv 2017年

作者： Vrabel, Robert Abas, Marcel Institute of Applied Informatics Automation and Mathematics Faculty of Materials Science and Technology Hajdoczyho 1 Trnava917 01 Slovakia

We analyze the dynamics of the forced singularly perturbed dif- ferential equation of Duffing's type. We explain the appearance of the large frequency nonlinear oscillations of the solutions. It is shown that the frequency can be controlled by a small parameter at the highest derivative. We give some generalizations of results obtained recently by B.S. Wu, W.P. Sun and C.W. Lim, Analytical approximations to the double-well Duffing oscillator in large amplitude oscillations, Journal of Sound and Vibration, Volume 307, Issues 3-5, (2007), pp. 953-960. The new method for an analysis of the nonlinear oscillations which is based on the dynamic change of coordinates is *** Codes 34K26 (Primary), 34A34, 34A26, 34C40 (Secondary) Copyright © 2017, The Authors. All rights reserved.

关键词： Vibration analysis

On the approximation of the boundary layers for the controllability problem of nonlinear singularly perturbed systems

学校读者我要写书评

暂无评论

arXiv 2017年

作者： Vrabel, R. Institute of Applied Informatics Automation and Mathematics Faculty of Materials Science and Technology Hajdoczyho 1 Trnava917 01 Slovakia

A new systematic approach to the construction of approximate solutions to a class of nonlinear singularly perturbed feedback control systems using the boundary layer functions especially with regard to the possible occurrence of the boundary layers is proposed. For example, problems with feedback control, such as the steady-states of the thermostats, where the controllers add or remove heat, depending upon the temperature registered in another place of the heated bar, can be interpreted with a second-order ordinary differential equation subject to a nonlocal three–point boundary condition. The O(ǫ) accurate approximation of behavior of these nonlinear systems in terms of the exponentially small boundary layer functions is given. At the end of this paper, we formulate the unsolved controllability problem for nonlinear *** Codes 93B52 (Primary), 34B10, 34A34, 34E15, 93C15, 93C70, 34A40 (Secondary) Copyright © 2017, The Authors. All rights reserved.

关键词： Feedback control

Using data mining methods for manufacturing process control

学校读者我要写书评

暂无评论

IFAC-PapersOnLine 2017年第1期50卷 6178-6183页

作者： Vazan P. Janikova D. Tanuska P. Kebisek M. Cervenanska Z. Institute of Applied Informatics Automation and Mechatronics Slovak University of Technology in Bratislava Faculty of Materials Science and Technology in Trnava J. Bottu 25 Trnava 917 24 Slovakia Advanced Technologies Research Institute Slovak University of Technology in Bratislava Faculty of Materials Science and Technology in Trnava J. Bottu 25 Trnava 917 24 Slovakia

The Industry 4.0 concept assumes that modern manufacturing systems generate huge amounts of data that must be collected, stored, managed and analysed. The case study is focused on predicting the manufacturing process behaviour according to production data. The paper presents the way of gaining knowledge about the future behaviour of manufacturing system by data mining predictive tasks. The proposed simulation model of the real manufacturing process was designed to obtain the data necessary for the control process. The predictions of the manufacturing process behaviour were implemented varying the input parameters using selected methods and techniques of data mining. The predicted process behaviour was verified using the simulation model. The authors analysed different methods. The neural network method was selected for deploying new data by PMML files in the final phases. The objectives of the research are to design and verify the data mining tools in order to support the manufacturing system control by aiming at improving the decisionmaking process. Based on the prediction of the goal production outcomes, the actual control strategies can be precisely modified. Then they can be used in real manufacturing system without risks. © 2017

关键词： data mining decision making manufacturing process prediction simulation

The Radius of Metric Subregularity

学校读者我要写书评

暂无评论

arXiv 2018年

作者： Dontchev, Asen L. Gfrerer, Helmut Kruger, Alexander Y. Outrata, Jiří V. Department of Aerospace Engineering The University of Michigan Ann ArborMI United States Institute of Computational Mathematics Johannes Kepler University Linz LinzA-4040 Austria Centre for Informatics and Applied Optimization Federation University Australia PO Box 663 BallaratVIC3353 Australia Institute of Information Theory and Automation Czech Academy of Science Pod Vodárenskou věží 4 Prague182 08 Czech Republic

There is a basic paradigm, called here the radius of well-posedness, which quantifies the "distance" from a given well-posed problem to the set of ill-posed problems of the same kind. In variational analysis, well-posedness is often understood as a regularity property, which is usually employed to measure the effect of perturbations and approximations of a problem on its solutions. In this paper we focus on evaluating the radius of the property of metric subregularity which, in contrast to its siblings, metric regularity, strong regularity and strong subregularity, exhibits a more complicated behavior under various perturbations. We consider three kinds of perturbations: by Lipschitz continuous functions, by semismooth functions, and by smooth functions, obtaining different expressions/bounds for the radius of subregularity, which involve generalized derivatives of set-valued mappings. We also obtain different expressions when using either Frobenius or Euclidean norm to measure the radius. As an application, we evaluate the radius of subregularity of a general constraint system. Examples illustrate the theoretical *** Codes 49J52, 49J53, 49K40, 90C31 Copyright © 2018, The Authors. All rights reserved.

关键词： Function evaluation

Predictive control of 5 DOF robot arm of autonomous mobile robotic system motion control employing mathematical model of the robot arm dynamics

学校读者我要写书评

暂无评论

Predictive control of 5 DOF robot arm of autonomous mobile r...

International Conference on Process Control (PC)

作者： Květoslav Belda Oliver Rovný Dept. of Adaptive Systems Automation of the CAS Czech Republic Institute of Automation Measurement and Applied Informatics Faculty of Mechanical Engineering STU Mýtna 36 811 07 Bratislava Slovakia

ISBN: (纸本)9781538640128

The paper deals with a design of model predictive control (MPC) as an example of the advanced local motion control of articulated robot arms in the scope of manipulation operations within the intradepartmental transportation among workplaces. Initially, the use of articulated robotic arms as a part of mobile robotic systems is discussed. Then, the convenient composition of mathematical models of kinematics and dynamics of the aforementioned robot arms is introduced. Thereafter, MPC design is explained. The proposed theoretical methods of the mathematical modeling and control design are demonstrated by the simulation of the 5 degrees of freedom robot arm composed of drive, joint and arm modules of the Schunk Co.

关键词： Manipulators Robot kinematics Mathematical model Kinematics Mobile communication Motion control

Hybrid MPC for gasoline engine air-fuel ratio control using optimal PWA approximation

学校读者我要写书评

暂无评论

IFAC-PapersOnLine 2017年第1期50卷 2878-2885页

作者： Honek M. Gulan M. Vlad C. Rohaľ-Ilkiv B. Institute of Automation Measurement and Applied Informatics Faculty of Mechanical Engineering Slovak University of Technology in Bratislava Námestie slobody 17 Bratislava 812 31 Slovakia Laboratory of Signals and Systems CentraleSupélec-CNRS-Univeristé Paris Sud Univeristé Paris-Saclay 3 rue Joliot Curie Gif-sur-Yvette 911 90 France

This paper deals with air-fuel ratio control for a gasoline combustion engine. The proposed approach is based on tracking of fuel mass flow reference using a nonlinear model of air and fuel path dynamics in cylinder. To maintain the model accuracy while keeping its complexity on an acceptable level, we propose to employ an optimal piecewise affine approximation of the derived nonlinear model, covering the entire operating range of the real system. The resulting hybrid model is subsequently used for model predictive control synthesis, where the formulated optimization problem is solved online by mixed-integer quadratic programming. To evaluate the tradeoff between complexity and performance of the obtained controller, it is compared with the one obtained by nonlinear programming exploiting the full nonlinear model. The simulation results show that even a relatively low-complex approximation leads to a satisfactory air-fuel ratio control performance while allowing for potential practical implementation on a real engine. © 2017

关键词： air-fuel ratio control gasoline engine hybrid model predictive control piecewise affine model

Local null controllability of the control-affine nonlinear systems with time-varying disturbances. direct calculation of the null controllable region

学校读者我要写书评

暂无评论

arXiv 2017年

作者： Vrabel, Robert Slovak University of Technology in Bratislava Faculty of Materials Science and Technology Institute of Applied Informatics Automation and Mechatronics Bottova 25 Trnava917 01 Slovakia

The problem of local null controllability for the control-affine nonlinear systems ẋ (t) = f (x(t))+Bu(t)+w(t), t ∈ [0, T ] is considered in this paper. The principal requirements on the system are that the LTI pair ((∂f /∂x)(0), B) is controllable and the disturbance is limited by the constraint |f (0) + w(t)| ≤ Md (1 − Tt )η , Md ≥ 0 and η > 0. These properties together with one technical assumption yield a complete answer to the problem of deciding when the null controllable region have a nonempty interior. The criteria obtained involve purely algebraic manipulations of vector field f, input matrix B and bound on the disturbance w(t). To prove the main result we have derived a new Gronwall-type inequality allowing the fine estimates of the closed-loop solutions. The theory is illustrated and the efficacy of proposed controller is demonstrated by the examples where the null controllable region is explicitly calculated. Finally we established the sufficient conditions to be the system under consideration (with w(t) ≡ 0) globally null *** Codes 93B05 (Primary) 93C10, 93D15 (Secondary) Copyright © 2017, The Authors. All rights reserved.

关键词： State feedback