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Mathematical Modeling of Transient Processes in the Jet Pipe Servoactuator with a Dual-Mode Controller

Procedia Engineering 2016年 150卷 168-172页

作者： A.V. Mesropyan R.R. Sharipov Ufa State Aviation Technical University 12 K. Marksa Ufa 450008 Russia

This paper describes an electro-hydraulic servo-actuator using dual-mode controllers in the control loop. The aim is a null stationary error and the shortest possible time response. The mathematical model of the servo-actuator is constructed taking into account the functional model of the open-centre servo-valve. This model is used for the numerical simulation of the system functioning. The model uses mass flow ratios in order to obtain a more stable and realistic numerical simulation. The dynamic simulation studies the behavior of the servo-actuator with different controllers in the control loop. The model tests the proportional controller and types of programmable logic controllers. The controllers are implemented in MATLAB/SIMULINK. The controllers are tested by numerical simulation. One may assume the technical superiority of programmable logic controllers.

关键词： servo-valve numerical simulation electro-hydraulic servo-actuator programmable logic controllers

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Automated Test Suite Generation to Test Modular Designed Packaging Machines using Fault Injection and a Simulink-based Simulation Approach

Automated Test Suite Generation to Test Modular Designed Pac...

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IEEE International Conference on Automation Science and Engineering

作者： Franziska Wiebe Susanne Rosch Sebastian Rehberger Birgit Vogel-Heuser Institute of Automation and Information Systems Technical University of Munich

ISBN: (纸本)9781509024100

In spite of the rising complexity and functionality of programmable logic Controller (PLC) software, a high degree in quality and reliability has to be guaranteed for automated production systems. Applying structured testing, faults can be recognized and eliminated early during the engineering process. Therefore, in this paper an approach for automatic test suite generation implemented with Fault Injection (FI) for modular production systems is presented. The automatically generated test suite consists of test cases selected out of a test case library. The approach is developed based on the simulation environment MATLAB/Simulink and evaluated with a PLC of a packaging machine as hardware-in-the-loop test. The goal of this paper is the development of an automatic test suite generation approach with fault injection conducted with modular packaging machines.

关键词： Packaging machinery CASING INSPECTION programmable logic controllers faults Automatic testing Production systems Modularity Injections Automated Production Systems

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Detecting anomalous programmable logic controller behavior using RF-based Hilbert transform features and a correlation-based verification process

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INTERNATIONAL JOURNAL OF CRITICAL INFRASTRUCTURE PROTECTION 2015年 9卷 41-51页

作者： Stone, Samuel J. Temple, Michael A. Baldwin, Rusty O. Air Force Inst Technol Dept Elect & Comp Engn Wright Patterson AFB OH 45433 USA Riverside Res Beavercreek OH 45431 USA

Industrial control systems are used to operate critical infrastructure assets in the civilian and military sectors. Current industrial control system architectures are predominantly based on networked digital computers that enable reliable monitoring and control of critical functions via localized and distributed operations. Many industrial control systems, in particular, supervisory control and data acquisition (SCADA) systems, implement monitoring and control using programmable logic controllers, which have served as gateways through which cyber attacks have been orchestrated against high-profile industrial control system targets. This paper focuses on securing the programmable logic controller gateway against unauthorized entry and mitigating attack risks by (i) adopting a previously demonstrated capability that provides hardware device discrimination using information extracted from intentional radio frequency (RF) emissions;and (ii) adapting the RF-based verification methodology to exploit information in unintentional programmable logic controller emissions to detect anomalous operations and enhance industrial control system security. Operational status verification (normal operation versus anomalous operation) is demonstrated using emissions from 10 like-model programmable logic controllers. The correlation-based verification approach with Hilbert transform features demonstrates superior performance than with untransformed time domain features. Experimental results demonstrate that an arbitrary equal error rate (EER) benchmark (EER <= 10%) is achieved for all programmable logic controllers with a signal-to-noise ratio (SNR) of 5.0 dB when Hilbert-transformed features are used for complete programmable logic controller program scans or SNR=0.0 dB when each programmable logic controller program operation is compared independently. This benchmark was not achieved for any programmable logic controllers when untransformed time domain features were employed. Publish

关键词： Industrial control systems programmable logic controllers RF emissions Anomaly detection Hilbert transforms

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Constructing cost-effective and targetable industrial control system honeypots for production networks

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INTERNATIONAL JOURNAL OF CRITICAL INFRASTRUCTURE PROTECTION 2015年 10卷 47-58页

作者： Winn, Michael Rice, Mason Dunlap, Stephen Lopez, Juan Mullins, Barry Air Force Inst Technol Dept Elect & Comp Engn Wright Patterson AFB OH 45433 USA Appl Res Solut Beavercreek OH 45440 USA

Critical infrastructure assets - and especially industrial control systems - are at risk. Malicious actors are constantly developing exploits that sneak past security controls. Honeypots offer an opportunity to acquire knowledge about the tactics, techniques and procedures used by malicious entities to compromise sensitive systems. However, the proprietary, and often expensive, hardware and software used by industrial control systems make it very challenging to build flexible, economical and scalable honeypots. This paper describes a technique that uses proxy technology to produce multiple high-interaction honeypots using a single programmable logic controller. The technique provides a cost-effective method for distributing multiple, authentic, targetable honeypots at slightly more than the cost of a single programmable logic controller. Published by Elsevier B.V.

关键词： Industrial control systems programmable logic controllers Production networks Honeypots

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Automated Stacker System Design and Development: Structural Support, End-Effector, and Control Subsystems

Automated Stacker System Design and Development: Structural ...

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Annual IEEE International Systems Conference

作者： L. Edwards S. Hayes S. Penny S. B. Lakshmikanth A. Sergeyev S. M. Azizi Electrical Engineering Technology Michigan Technological University Mechanical Engineering Department Michigan Technological University

ISBN: (纸本)9781467395205

In this paper, the results of a research and development project sponsored by Nucor Steel Corporation, Marion, Ohio, is presented. This project is conducted at Michigan Technological University with the objective to design and develop an automated robotic system for precise stacking of highway signposts, while complying with the required stacking pattern as well as time constraints. The design and development is fulfilled for the three main subsystems including structural support, end-effector, and control subsystems. The completed stacker system is tested at Michigan Technological University and delivered to Nucor Steel plant to be installed at Press #2 of the production line in highway products division.

关键词： Robotics and automation Automated stacker programmable logic controller Human machine interface Steel industry Human machine interaction Steel industry TECHNOlogicAL UNIVERSITIES programmable logic controllers Robotics and automation Stackers Structural supports SUB-SYSTEM Time constraints

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A new bitwise voting strategy for safety-critical systems with binary decisions

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TURKISH JOURNAL OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCES 2015年第5期23卷 1507-1521页

作者： Durmus, Mustafa Seckin Eris, Oytun Yildirim, Ugur Soylemez, Mehmet Turan Istanbul Tech Univ Elect & Elect Fac Dept Control Engn TR-80626 Istanbul Turkey

The main issue in controlling safety-critical systems such as nuclear power reactors or railway interlocking systems is to provide high safety and reliability where the risk ratio is at the highest level because small errors might result in hazardous accidents (e.g., death or injury of many people). The N-version programming technique, where N-different modules run in parallel, can be used to improve the reliability and safety of such systems at the desired safety level. Decisions of N-different modules are then evaluated by another component, usually known as the voter, using different voting strategies. In the current study a bitwise voting strategy to evaluate module decisions that are based on safe-states of variables is proposed and possible synchronization problems between the modules are determined. Sequence diagrams and solutions for synchronization problems are also explained.

关键词： Bitwise-voting N-version programming programmable logic controllers railway interlocking systems safety-critical software

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Integrating PLC theory and programming into advanced controls courses

Integrating PLC theory and programming into advanced control...

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American Control Conference

作者： Alexander S. Miller William Singhose Urs Glauser The George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology Atlanta 30332-0405 USA School of Engineering Zurich University of Applied Sciences 8401 Winterthur Switzerland

ISBN: (纸本)9781467386838

Designing advanced control systems is a challenging task that requires the integration of numerous simulations and experiments into the design decision-making process. Unfortunately, controls courses are often focused on theory and do not provide students with knowledge, or practical experience, of how to actually implement controllers. programmable logic controllers (PLC) are often used in industrial applications. PLCs continue to improve their computational abilities and are nowadays capable of running codes generated with MATLAB/Simulink. A two-week curriculum was added to a graduate controls course to teach students operational techniques and programming of PLCs. Students developed skills necessary to design a controller using logic operations, logic gates, PLC programming, and a Human Machine Interface (HMI). The curriculum required the programming of a PLC and HMI to control automated test equipment with electro-pneumatic components.

关键词： Cranes Bridges Programming Graphical user interfaces Payloads Mobile communication Software Programming programmable logic controllers graphical user interfaces Payload Gruidae Cranes mobile communication bridges computer software Curriculum Human machine interaction

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Improved throughput for Power Line Communication (PLC) for smart meters using fog computing based data aggregation approach

Improved throughput for Power Line Communication (PLC) for s...

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IEEE International Smart Cities Conference (ISC2)

作者： Mohamed Saleem Haja Nazmudeen Au Thien Wan Seyed M. Buhari Universiti Teknologi Brunei Eledia Offshore Lab Eledia Research Centre Brunei Darussalam Universiti Teknologi Brunei Eledia Research Centre Brunei Darussalam King Abdul Aziz University Kingdom of Saudi Arabia

ISBN: (纸本)9781509018475

The smart grid is now being deployed in many countries to provide cleaner and greener energy to the consumers. To implement this efficiently and effectively appropriate data collecting, processing and transmitting infrastructures are needed to be in place. Smart meters are used to measure the energy consumption details and patterns and transmit to meter data management system (MDMS) with the help of data aggregation units (DAU). The sheer amount of data need to be collected from the consumers are very huge and they fall under the category of big data. Currently, all the data collected from smart meters are stored in a centralized place for processing to forecast the energy demand. This approach is becoming a bottleneck for efficient data collection due to limited bandwidth capacities of Power Line Communication (PLC). In this paper, we propose a framework for distributed data aggregation approach with the help of fog computing architecture. With this approach the amount of data sent to the centralized storage space is limited and, therefore, the capacity of PLC is virtually improved without compromising the functionality.

关键词： smart meters Big Data carrier transmission on power lines data aggregation distributed processing energy consumption load forecasting power engineering computing Smart meters carrier transmission on power lines unified retrieval models big data Power engineering computing Distributed processing load forecasting energy consumption programmable logic controllers Data Collection Methods

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The Portevin-Le Chatelier Effect in the Ni-Based Superalloy IN100

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METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE 2015年第12期46A卷 5596-5609页

作者： Fernandez-Zelaia, Patxi Adair, Benjamin S. Barker, Vincent M. Antolovich, Stephen D. Georgia Inst Technol George W Woodruff Sch Mech Engn Atlanta GA 30332 USA Washington State Univ Sch Mech & Mat Engn Pullman WA 99164 USA

The Portevin-Le Chatelier (PLC) effect has been studied in the Ni-based superalloy IN100 which is currently used as a disk material in jet engines. A series of tensile tests was carried out at 588 K, 755 K, and 922 K (315 degrees C, 482 degrees C, and 649 degrees C) at plastic strain rates ranging from a low of 6.21 x 10(-6) s(-1) to a high of 4.92 x 10(-2) s(-1). The activation energy was determined using the slope of a line on a strain rate/temperature graph which divided the area of the graph into two regions: (1) "PLC behavior observed,'' and (2) "No PLC behavior observed.'' A new statistical approach was developed to objectively differentiate between a true PLC effect and experimental uncertainty (i.e., "noise''). The value of the activation energy was found to be 1.14 eV/atom, which strongly suggests that the rate controlling process was bulk diffusion of C in the lattice. A qualitative model, based on the Orowan equation and slip band dislocation mechanics, was proposed, which unifies the seemingly disparate ideas of the process being controlled by a single atom/dislocation interaction while at the same time exhibiting significant strains during PLC load drops. (C) The Minerals, Metals & Materials Society and ASM International 2015

关键词： Portevin-Le Chatelier effect Activation energy volume diffusion extension tests strain rate Nickel base superalloys programmable logic controllers Control procedures

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Analysis framework for evaluating PLC software: An application of Semantic Web technologies

Analysis framework for evaluating PLC software: An applicati...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Stefan Feldmann Florian Hauer Sebastian Ulewicz Birgit Vogel-Heuser Institute of Automation and Information Systems Technische Universität München Germany

ISBN: (纸本)9781509008742

Control software in the automated production systems domain is becoming increasingly complex. As a consequence, appropriate methods to improve control software quality need to be identified. Although sophisticated frameworks and tools for software quality improvement exist in the computer science domain, support for industrial control software development is still limited. As a first step towards addressing this issue, this paper proposes an analysis framework that aims at evaluating control software by means of Semantic Web technologies.

关键词： Web Technologies computer software semantic networks Frameworks software quality computer programs programmable logic controllers Automated Production Systems Addressing First Step

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