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9th Annual IEEE International Systems Conference (SysCon)

作者： Edwards, L. Hayes, S. Penny, S. Lakshmikanth, S. B. Sergeyev, A. Azizi, S. M. Michigan Technol Univ Sch Technol Houghton MI 49931 USA Michigan Technol Univ Mech Engn Dept Houghton MI 49931 USA

ISBN: (纸本)9781479959273

In this paper, a robotic stacker is designed to enable precise stacking of highway sign posts produced by Nucor Steel Corporation, while complying with the required stacking pattern as well as time constraints. The Nucor Steel Corporation bar mill, located in Marion Ohio, relies heavily on manual work force in its highway products division. A highly manual process introduces many safety hazards as well as inefficiencies and inconsistencies. One hazardous position is the bundling of heavy sign posts, which are manually raked into bundles before being manually banded, and workers are at risk for overuse injuries. Moreover, the sign posts are randomly positioned within a bundle, and hence the disorganized bundle is much larger than an organized stack of the same count. Disorganized bundles also hinder further automation processes downstream the production line, such as banding and powder coating the sign posts. This paper offers a robotic stacker solution utilizing Fanuc robot manipulators, custom-built end-effectors, and programmable logic controller (PLC) integrated with human machine interface (HMI) that will result in smaller and organized stacks as compared with the current disorganized bundles, and the removal of a worker from the hazardous position in the process. Organized stacks will also allow for further downstream automation processes. This research project is to be executed at Michigan Technological University and is sponsored by Nucor Steel Corporation.

关键词： Steel industry robotics and automation automated stacker programmable logic controller human machine interface optimal path planning

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Fuzzy controller developed in a PLC, based on weighted average method.

Fuzzy controller developed in a PLC, based on weighted avera...

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CHILEAN Conference on Electrical, Electronics Engineering, Information and Communication Technologies (CHILECON)

作者： Leon, Paola Lara, Hernan Aguilar, Darwin Vega, Christian Sotomayor, Danny Espinosa, Nikolai Univ Fuerzas Armadas ESPE Dept Elect & Elect Engn Grp Invest Propagac Control & Networking PROCONET Sangolqui Ecuador

ISBN: (纸本)9781467387569

The industry control solutions are generally base on a programmable logic controller (PLC), however implementations of Fuzzy controllers for complex systems which control is based on a fuzzy system has been a disadvantage since not all PLC's have specific modules for this purpose. This work proposes a procedure for the implementation of Fuzzy logic controller (FLC) on a PLC without the use of any specific module. The FLC assumes a Mamdani-based inference and defuzzyfication of Weighted Average Method (WAM) with two inputs and one output. Simulation and experimental validation are carried out in order to verify the effectiveness of the FLC designed.

关键词： Fuzzy logic programmable logic controller Weigthed average method

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PLC based Automated Liquid Mixing and Bottle Filling System

PLC based Automated Liquid Mixing and Bottle Filling System

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International Conference on Power Electronics, Intelligent Control and Energy Systems

作者： Mini Sreejeth Shilpa Chouhan Deptt. of Electrical Engineering Delhi Technological University India

ISBN: (纸本)9781467385886

Automating repetitive tasks in the industries increases the productivity;reduces the probability of error and maintain product quality. Traditional methods of mixing fixed quantities of different types of liquids and filling them in bottles involve manual mixing of the constituent components based on measurements and bottling of the mixture as desired. Manual handling of such tasks is time consuming;expensive and often lack consistency in product quality due to human errors. A Laboratory Prototype of a programmable logic controller (PLC) based automated liquid mixing and bottle filling system is designed to automate the control and mixing of two different liquids in predefined proportion and filling the generated mixture in bottles to achieve quality control;reduce human intervention and improve productivity. The mixing system draws fluids from two storage tanks and mix them in a user selectable pre-defined proportion and stores the mixture in an overhead reservoir. The bottling system transfers the mixture from the overhead reservoir to conveyor fed empty bottles based on the user defined ladder logic. The developed laboratory prototype of the automated system has housekeeping features;which include high and low level liquid indicators;emergency alarm for warning the operator and automatic stop features etc.

关键词： Automated Bottling System Conveyor Belt Liquid Level Indicators Solenoid Valve programmable logic controller

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PLC based Power Factor Correction of 3-Phase Induction Motor

PLC based Power Factor Correction of 3-Phase Induction Motor

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International Conference on Power Electronics, Intelligent Control and Energy Systems

作者： Rishabh Jain Shashank Sharma Mini Sreejeth Madhusudan Singh Deptt. of Electrical Engg. Delhi Technological University

ISBN: (纸本)9781467385886

A programmable logic controller (PLC) based power factor correction method for a 3-phase Induction Motor (IM) through switching of shunt capacitors is proposed in this paper. A 3 phase IM has a low power factor (pi) at no load as it draws large magnetizing current and the active power delivered to the motor is low, which is utilized to overcome the no-load losses. The PLC based power factor improvement algorithm is developed and implemented on a 3 Phase laboratory prototype IM coupled to a DC generator and the effectiveness of the algorithm is tested under no-load and loaded condition. Based on the instantaneously measured value of power factor, the PLC switches the appropriate bank of capacitors into the circuit depending on the load condition to improve the pf. Large scale use of PLC in industrial automation, adaptability, simple implementation and economics justified its selection as the switching controller. A significant improvement in power factor under different loading conditions is observed.

关键词： 3-phase Induction Motor Power Factor Power Factor Correction programmable logic controller

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A Trusted Autonomic Architecture to Safeguard Cyber-Physical Control Leaf Nodes and Protect Process Integrity

A Trusted Autonomic Architecture to Safeguard Cyber-Physical...

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作者： Chiluvuri, Nayana Teja Virginia Tech | University

Cyber-physical systems are networked through IT infrastructure and susceptible to malware. Threats targeting process control are much more safety-critical than traditional computing systems since they jeopardize the integrity of physical infrastructure. Existing defence mechanisms address security at the network nodes but do not protect the physical infrastructure if network integrity is compromised. An interface guardian architecture is implemented on cyber-physical control leaf nodes to maintain process integrity by enforcing high-level safety and stability policies. Preemptive detection schemes are implemented to monitor process behavior and anticipate malicious activity before process safety and stability are compromised. Autonomic properties are employed to automatically protect process integrity by initiating switch-over to a verified backup controller. Subsystems adhere to strict trust requirements safeguarding them from adversarial intrusion. The preemptive detection schemes, switch-over logic, backup controller, and process communication are all trusted components that are separated from the untrusted production controller. The proposed architecture is applied to a rotary inverted pendulum experiment and implemented on a Xilinx Zynq-7000 configurable SoC. The leaf node implementation is integrated into a cyber-physical control topology. Simulated attack scenarios show strengthened resilience to both network integrity and reconfiguration attacks. Threats attempting to disrupt process behavior are successfully thwarted by having a backup controller maintain process stability. The system ensures both safety and liveness properties even under adversarial conditions.

关键词： Process control systems cyber-physical systems autonomic systems programmable logic controller remote terminal unit human-machine interface FPGA trust configurable system-on-chip heterogeneous computing high-level synthesis Thesis

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Alternate Fault testing on a Bus on a Dynamic Position Vessel

Alternate Fault testing on a Bus on a Dynamic Position Vesse...

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作者： Moorman, Anna Julia Virginia Tech | University

Direct fault testing onboard Dynamic Position Vessels is a requirement to maintain the ships classification and ensure redundancy of the power system onboard to maintain position. The most vulnerable part of the ship when testing occurs is when a three phase fault is placed on a main bus. This puts tremendous amount of strain on the system. This thesis offers an alternate and safer way to ensure the protection equipment is working properly by using a fault signal using from programmable logic controller in conjunction with the protection relays. A working PSCAD model of Transocean’s DEEPWATER CHAMPION was developed using a one line diagram. Using the developed PSCAD model three phase fault currents could be calculated and then simulated as a scaled down secondary current to use for testing the protection relays. To test the develop testing system different bus configurations were analyzed to determine loss of thruster capabilities which deter the vessel to maintain position.

关键词： Dynamic Position Fault testing programmable logic controller Thesis

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Development and Assessment of Wireless Touch Control Technique for Learning Mechatronics

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INTERNATIONAL JOURNAL OF ENGINEERING EDUCATION 2015年第5期31卷 1282-1287页

作者： Shyr, Wen-Jye Feng, Chi-Feng Lin, Chia-Ming Wu, Hui-Chuan Natl Changhua Univ Educ Dept Ind Educ & Technol Changhua 500 Taiwan

This study designs a programmable logic controller (PLC) and wireless touch control technique for use in mechatronics learning. Its purpose is to provide a laboratory platform for students of engineering and technology to experiment with the design of wireless touch control technique. The principles of instructional systems design were implemented in the development of the learning module. This innovative two-position oscillating learning system elucidates the principles, function and application of mechatronics and wireless touch control technique. Thirty-eight students and eight domain experts answered an anonymous questionnaire. The domain experts were university professors and/or researchers with an average of more than five years of experience in mechatronics. An encouraging preliminary assessment of the proposed system demonstrated the accuracy of the embedded knowledge as well as the effectiveness.

关键词： programmable logic controller touch and control technique Bluetooth mechatronics

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Improving the feed-forward compensator in predictive control for setpoint tracking

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ISA TRANSACTIONS 2014年第3期53卷 755-766页

作者： Valencia-Palomo, G. Rossiter, J. A. Lopez-Estrada, F. R. Inst Tecnol Hermosillo Hermosillo 83170 Sonora Mexico Univ Sheffield Dept Automat Control & Syst Engn Sheffield S1 3JD S Yorkshire England Inst Tecnol Tuxtla Gutierrez Chiapas 29050 Mexico

Simple predictive control (MPC) algorithms produce a feed-forward compensator that may be a suboptimal choice. This paper gives some insights into this issue and simple means of modifying the feed-forward to produce a more systematic and optimal design. In particular, it is shown that the optimum procedure depends upon the underlying loop tuning and also that there are, as yet under utilised, potential benefits with regard to constraint handling procedures, which helps to improve the computational efficiency of the online controller implementation. A laboratory test in a programmable logic controller (PLC) was carried out to demonstrate the code on real hardware and the effectiveness of the solution. (C) 2014 ISA. Published by Elsevier Ltd. All rights reserved.

关键词： Predictive control Tracking Feed-forward Performance programmable logic controller IEC 61131-3

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Formal representation of GRAFCET to automatically generate control code

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CONTROL ENGINEERING PRACTICE 2014年 33卷 84-93页

作者： Schumacher, Frank Fay, Alexander Univ Hamburg Inst Automat Technol D-22043 Hamburg Germany

Within the engineering of control code, model-based approaches become more and more important. Basically GRAFCET serves as a suitable modeling language but lacks an exhaustive formal representation of its structure and dynamic behavior since current approaches only consider subclasses of GRAFCET. Within this article the authors depict a systematic approach for an exhaustive formal model of GRAFCET, specifically by taking enclosing steps, forcing orders and time constraints into account. Based on this formal model of GRAFCET a method together with a tool framework are presented allowing for the automatic generation of control code. (C) 2014 Elsevier Ltd. All rights reserved.

关键词： Modeling language GRAFCET Formalization Control code programmable logic controller

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Flexible function block implementation of the balance-based adaptive controller as the potential alternative for PID-based industrial applications

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TRANSACTIONS OF THE INSTITUTE OF MEASUREMENT AND CONTROL 2014年第8期36卷 1098-1113页

作者： Klopot, Tomasz Laszczyk, Piotr Stebel, Krzysztof Czeczot, Jacek Silesian Tech Univ Fac Automat Control Elect & Comp Sci Inst Automat Control Ul Akad 16 Gliwice Poland

This paper deals with the practical aspects of the implementation of the balance-based adaptive control (B-BAC) technique. It gives the simple mathematical background of this methodology, shows the case-independent implementation concept as the ready-to-use flexible function block that results from the B-BAC generality, discusses how to embed the additional functionalities required in professional industrial control applications and finally presents three implementation examples for three different programming and hardware platforms. The control performance of each B-BAC function block is validated experimentally and compared with the performance of the corresponding platform-related standard PID function blocks. The comparative results and the potential accessibility of both the flexible function block and the simple tuning method put forward B-BAC methodology as a strong alternative for PID-based industrial control applications.

关键词： Adaptive non-linear model-based control experimental validation IEC 61131-3 practical implementation programmable logic controller

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