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Hybrid flow shop scheduling with finite buffers

International Journal of Simulation and Process Modelling 2018年第2期13卷 156-166页

作者： Han, Zhonghua Sun, Yue Ma, Xiaofu Lv, Zhe Faculty of Information and Control Engineering Shenyang Jianzhu University Shenyang China Department of Digital Factory Shenyang Institute of Automation Chinese Academy of Sciences Shenyang China Department of Electrical and Computer Engineering Virginia Tech Blacksburg United States

In this paper, the scheduling problem for hybrid flow shop is investigated with the consideration of the finite buffers. Different from the existing works which focus on the makespan minimisation under the constraints of given intermediate buffer sizes, this paper investigates how to decide the reasonable size of the intermediate buffer. Firstly, the problem is modelled with the design of the accurate and reasonable buffer space without affecting the flow shop production efficiency. Then, a hybrid heuristic method is proposed to reduce the algorithm complexity. Specifically, the buffer size is estimated based on the theory of probability distribution, and the searching for the global optimal solution is processed by using a novel and effective self-adaptive differential evolution algorithm. The proposed algorithm can adjust parameters intelligently for stopping unnecessary iterations as well as avoiding the stagnant situation of the local optimum. Lastly, a wide range of practical scenarios are considered for algorithm evaluation, and the numerical results show that the proposed approach is effective on: 1) reducing the buffer size;2) guaranteeing the hybrid flow shop efficiency. Copyright © 2018 Inderscience Enterprises Ltd.

关键词： Probability distributions

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Secure web access control algorithm

arXiv

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arXiv 2018年

作者： Ioan, Filip Iosif, Szeidert Cristian, Vasar Department of Control System Engineering "politehnica" University of Timisoara Faculty of Automation and Computers Bv. V. Parvan No.2 Timisoara300223

The paper presents a flexible and efficient method to secure the access to a Web site implemented in PHP script language. The algorithm is based on the PHP's session mechanism. The proposed method is a general one and offers the possibility to implement a PHP based secured access to a Web site, through a portal page and using an additional script included in any site's page, which is required to be accessed only by registered users. This paper presents the design, implementation and integration of the algorithm on any generic WEB site. Copyright © 2018, The Authors. All rights reserved.

关键词： Websites

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Finite Element Analysis of A new Multi-DOF Flexible Micro-Displacement Manipulator Based on Ferrofluid

Finite Element Analysis of A new Multi-DOF Flexible Micro-Di...

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IEEE/ASME International Conference on Advanced Intelligent Mechatronics

作者： Chunfang Li Shuai Wu Bo Yu Zongxia Jiao With faculty of School of Automation Science and electrical Engineering Beihang University Beijing China Science and Technology on Aircraft Control Laboratory Beihang University Beijing China

This paper presents a new multi-DOF flexible micro-displacement manipulator based on ferrofluid for high precision micro-displacement manipulation. It is aimed at achieving a flexible, smooth and precise control of multiple degrees of freedom micro-displacement by utilizing controlled ferrofluid. The mover of the proposed manipulator is suspended on the ferrofluid affected by the combined magnetic field coupled by a permanent magnetic field and a controlled electromagnetic field. Then the proposed manipulator can be manipulated by changing the strength of the combined magnetic field, which is adjusted by the input current. In addition, the proposed manipulator also can effectively eliminate the disturbance to the micro-operation caused by vibration during operation since the mover is totally supported by ferrofluid. The finite element analysis is also performed to observe the magnetic field intensity changes in ferrofluid with different excitation current, which verifies the rationality and feasibility of the proposed manipulators. Consequently, the proposed manipulator has a significant potential for applications where the high precision micro-displacement manipulation, such as microinjection system.

关键词： Manipulators Actuators Magnetic levitation Iron Force Windings Ferrofluid

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Fuzzy PID type STR based on SVR for nonlinear systems 10

Fuzzy PID type STR based on SVR for nonlinear systems

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10th International Conference on Electrical and Electronics engineering, ELECO 2017

作者： Uçak, Kemal Günel, Gülay Öke Faculty of Engineering Department of Electrical and Electronics Engineering Muǧla Sitki Koçman University Muǧla Turkey Faculty of Electrical and Electronics Engineering Department of Control and Automation Engineering Istanbul Technical University Istanbul Turkey

ISBN: (纸本)9786050107371

In this study, generalized self-tuning regulator (STR) based on support vector regression (SVR) which was previously introduced [1] is deployed to control a continuously stirred tank reactor (CSTR) system. The parameters of the Fuzzy PI D controller utilized in the controller block are tuned via SVR based parameter estimator and system model blocks. The performance of the controller has been evaluated by simulations carried out on the CSTR system. © 2017 EMO (Turkish Chamber of Electrical Enginners).

关键词： controllers

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Algorithms Analysis of Mobile Robot SLAM based on Kalman and Particle Filter 9th

Algorithms Analysis of Mobile Robot SLAM based on Kalman and...

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2017 9th International Conference on Modelling, Identification and control (ICMIC 2017)

作者： Feng Zhang Siqi Li Shuai Yuan Enze Sun Languang Zhao Information & Control Engineering Faculty Shenyang Jianzhu University State Key Laboratory of Robotics Shenyang Institute of AutomationChinese Academy of Sciences

ISBN: (纸本)9781509065769;9781509065752

Many algorithms of mobile robot SLAM(Simultaneous Localization and Mapping) have been researched at present,however,the SLAM algorithm of mobile robot based on probability is often used in the unknown *** this paper,two kinds of SLAM algorithms based on probability are analyzed and *** kind is the SLAM algorithm based on Kalman filter: extended Kalman filter SLAM(EKF-SLAM)and unscented Kalman filter SLAM algorithm(UKF-SLAM).Another kind is the SLAM algorithm based on Particle filter:Fast SLAM and unscented Fast SLAM(UFast SLAM) *** difference from the four algorithms of SLAM is illustrated in terms of principle and calculation ***,the simulation results show that the UFast SLAM algorithm is superior to other algorithms in robot path and landmark estimation.

关键词： mobile robot Simultaneous Localization and Mapping EKF-SLAM UKF-SLAM Fast SLAM UFast SLAM

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Electrical energy prediction study case based on neural networks

arXiv

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arXiv 2018年

作者： Vasar, Cristian Prostean, Octavian Filip, Ioan Szeidert, Iosif Department of Control System Engineering "Politehnica" University of Timisoara Faculty of Automation and Computers Bv. V. Parvan No.2 Timisoara1900 Romania

This paper presents some considerations regarding the prediction of the electrical energy consumption. It is well known that the central element of a microeconomic analysis is represented by the economical agents actions, actions that follow their own interest such as: the consumer – maximization of his satisfaction, the producer – maximization of his profit. The study case is focused on the prediction of the sold energy in Banat region. The goal of this study case is to optimize the electrical energy quantity purchased from the producer by the energy distributor in Banat region. The prediction is based on neural networks. There are used feed-forward and Elman type neural networks. In order to enhance the prediction accuracy there have been used both linear and nonlinear preprocessing units. The aspects considered in this paper can be extrapolated in any general case of prediction-based application, not only in the already stated case of electrical energy. Copyright © 2018, The Authors. All rights reserved.

关键词： Forecasting

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Construction of Three-dimensional Simulation Platform for Linear Inverted Pendulum Base on Model

Construction of Three-dimensional Simulation Platform for Li...

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2018 International Conference on Modeling, Simulation and Optimization(MSO 2018)

作者： Tao ZHANG Xi-you CHEN Guang-hui LIU Hua-liang ZHANG Peng ZENG Faculty of Electronic Information and Electrical Engineering Dalian University of Technology Key Laboratory of Industrial Control Network and System Shenyang Institute of AutomationChinese Academy of Sciences

The simulation platform and physical equipment in traditional control system of inverted pendulum are often independent of each other. Researchers are more likely to use Simulink for inverted pendulum simulation. The physical model is simplified, and the curves of the simulation result are correct as well. In this paper, a more practical nonlinear model of inverted pendulum is established. The model and control algorithm code are generated automatically based on embedded equipment, and experimental curves can be displayed in real time in a three-dimensional scene.

关键词： Linear inverted pendulum Code automatically generated Open Scene Graph(OSG)

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A digital damping controller to increases the safety in hydraulic pumping systems 13

A digital damping controller to increases the safety in hydr...

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13th IEEE International Conference on Industry Applications, INDUSCON 2018

作者： Barra, Hugo Menezes Marcillo, Kevin Eduardo Lucas Rocha, Erick Melo Nunes, Marcus Vinicius Alves De Araujo, Rejane Barros Junior, Walter Barra UFPa Faculty of Electrical Engineering Campus Do Guamá Federal University of Pará Belém ParáCEP: 66075-900 Brazil Escuela Superior Politécnica Del Litoral ESPOL Facultad de Ingeniería Eléctrica y Computación Campus Gustavo Galindo Km. 30.5 Via Perimetral Guayaquil Ecuador Department of Control and Automation Engineering Federal Institute of Pará IFPA Belém Brazil

ISBN: (纸本)9781538679951

Hydraulic pumping systems are ubiquitous in a wide range of industrial processes. However, such systems may exhibit dangerous pressure oscillations, which may lead to serious equipment damage and no programmed plant outage. In order to prevent equipment damage, this paper proposed a damping controller to mitigate dangerous pressure oscillations in hydraulic pumping systems. The controller design is based on frequency domain techniques. For implementation objectives, the resulting damping control law is then converted to discrete time domain by using Tustins methodology and, subsequently, embedded in a hardware built around a 32-bits ARM microcontroller. To assess the controller performance, experimental tests were developed on a laboratory scale pumping system comprised of a centrifugal pump driven by an induction motor-inverter set. The experimental results showed that the proposed controller provides an improve performance by mitigating the pressure oscillations in the tubes. Furthermore, the approach is of low-cost implementation in existing pumping systems. © 2018 IEEE.

关键词： Induction motors

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DC motors and servo-motors controlled by Raspberry Pi 2B 21

DC motors and servo-motors controlled by Raspberry Pi 2B

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21st International Conference on Circuits, Systems, Communications and Computers, CSCC 2017

作者： Šustek, Michal Marcaník, Miroslav Tomášek, Pavel Úředníček, Zdeněk Tomas Bata University Faculty of Applied Informatics Department of Automation and Control Engineering Zlín76005 Czech Republic

The expanding capabilities of today's microcontrollers and other devices lead to an increased utilization of these technologies in diverse fields. The automation and issue of remote control of moving objects belong to these fields. In this project, a microcontroller Raspberry Pi 2B was chosen for controlling DC motors and servo-motors. This paper provides basic insight into issue of controlling DC motors and servo-motors, connection between Raspberry and other components on breadboard and programming syntaxes for controlling motors in Python programming language. © The Authors, published by EDP Sciences, 2017.

关键词： DC motors

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Elasticity modulus variation of the AISI SAE 1045 steel subjected to corrosion process by chloride using tension test destructive

引用

IOP Conference Series: Materials Science and engineering 2020年第1期844卷

作者： C G Cárdenas-Arias A D Rincón-Quintero A Santos-Jaimes C L Sandoval-Rodriguez D F Rojas-Gomez S J Ardila-Galvis Design and materials research group (DIMAT) Automation and Control Energy Systems Research Group (GISEAC) Electromechanical engineering Faculty of Natural Sciences and Engineering Technological Units of Santander (UTS) Calle de los estudiantes No 9-82 680005 Bucaramanga Colombia. Materials Research Group (GIM). Mechanical Engineering Engineer School Pontifical Bolivarian University (UPB) Kilometer 7 Highway Floridablanca – Piedecuesta (057) (7) 6799220 Floridablanca Colombia.

The study of materials corrosion effect is a great importance topic for the manufacturing industry and also for the customer that requires this. That is why a research study was conducted that aimed to determine the elasticity modulus variation of AISI SAE 1045 steel subjected to corrosion. To achieve this, thirty-five specimens were used, which were exposed to chlorides by immersion processes and salt spray chamber in three periods of time and then subjected to stress test destructive, following the guidelines established under ASTM G-1 standards, ASTM G-31 and ASTM E-8. Variation was found in the elastic behavior of steel and curves that differ from the theoretical ones raised in the documents.

关键词：

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