Search results for "roller"

showing 10 items of 247 documents

Wi-Sense: a passive human activity recognition system using Wi-Fi and convolutional neural network and its integration in health information systems

2021

AbstractA human activity recognition (HAR) system acts as the backbone of many human-centric applications, such as active assisted living and in-home monitoring for elderly and physically impaired people. Although existing Wi-Fi-based human activity recognition methods report good results, their performance is affected by the changes in the ambient environment. In this work, we present Wi-Sense—a human activity recognition system that uses a convolutional neural network (CNN) to recognize human activities based on the environment-independent fingerprints extracted from the Wi-Fi channel state information (CSI). First, Wi-Sense captures the CSI by using a standard Wi-Fi network interface car…

Computer sciencebusiness.industry010401 analytical chemistry020206 networking & telecommunicationsPattern recognition02 engineering and technology01 natural sciencesConvolutional neural network0104 chemical sciencesActivity recognitionData setNetwork interface controllerChannel state informationVDP::Teknologi: 500::Medisinsk teknologi: 620Principal component analysis0202 electrical engineering electronic engineering information engineeringSpectrogramNoise (video)Artificial intelligenceElectrical and Electronic Engineeringbusiness
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An embedded datalogger with a fast acquisition rate for in-vehicle testing and monitoring

2011

A very compact and high performance datalogger for automotive in-vehicle testing is here described. The small logger dimensions and the availability of a CAN interface allows to easily implement multiple and distributed acquisition schemes, very challenging with traditional instrumentation. High acquisition rate, up to 100 Ksps/ch, and low cost was obtained through a very accurate hardware and software design.

Computer sciencebusiness.industryAutomotive industryData Acquisition In-Vehicle testingAutomotive electronicsSettore ING-INF/01 - ElettronicaCAN busMicrocodeEmbedded systemData loggerSoftware designInstrumentation (computer programming)businessThroughput (business)Automotive electronics controller area networks data loggers embedded systems
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Model of a CNC Feed Drive for On-Site Tuning of the Controllers for Single Axis Motion

2016

The accuracy of CNC machine-tools is heavily influenced by the correct tuning of the feed drives controllers. While an initial tuning is performed by the machine-tool manufactures, in time the values have to be changed by the user in order to preserve positioning and contouring accuracy of the machine. This paper presents a model of a CNC feed drive, for a particular CNC machine-tool, but with a high degree of generality. The objective is to provide the user the necessary knowledge, together with a simple, yet accurate simulation tool, in order to assist him in the process of tuning the controllers.

ContouringEngineeringbusiness.industryControl theorySingle axisFeed driveProcess (computing)PID controllerControl engineeringGeneral MedicineMotion controlbusinessMotion (physics)Applied Mechanics and Materials
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A Novel Adaptive Sliding Mode Controller for a 2-DOF Elastic Robotic Arm

2022

Collaborative robots (or cobots) are robots that are capable of safely operating in a shared environment or interacting with humans. In recent years, cobots have become increasingly common. Compliant actuators are critical in the design of cobots. In real applications, this type of actuation system may be able to reduce the amount of damage caused by an unanticipated collision. As a result, elastic joints are expected to outperform stiff joints in complex situations. In this work, the control of a 2-DOF robot arm with elastic actuators is addressed by proposing a two-loop adaptive controller. For the outer control loop, an adaptive sliding mode controller (ASMC) is adopted to deal with unce…

Control and OptimizationArtificial Intelligenceadaptive sliding mode controller; model reference adaptive controller; elastic robot arm; roboticsMechanical EngineeringVDP::Teknologi: 500::Industri- og produktdesign: 640Robotics
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PLC security and critical infrastructure protection

2013

Programmable Logic Controllers (PLCs) are the most important components embedded in Industrial Control Systems (ICSs). ICSs have achieved highest standards in terms of efficiency and performance. As a result of that, higher portion of infrastructure in industries has been automated for the comfort of human beings. Therefore, protection of such systems is crucial. It is important to investigate the vulnerabilities of ICSs in order to solve the threats and attacks against critical infrastructure to protect human lives and assets. PLC is the basic building block of an ICS. If PLCs are exploited, overall system will be exposed to the threat. Many believed that PLCs are secured devices due to it…

Control system securityEngineeringbusiness.industryProgrammable logic controllerCritical infrastructure protectionIndustrial control systemComputer securitycomputer.software_genreStuxnetCritical infrastructureData Protection Act 1998Isolation (database systems)businesscomputer2013 IEEE 8th International Conference on Industrial and Information Systems
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Guaranteed tuning of PID controllers for parametric uncertain systems

2004

This paper presents a methodology for tuning the controller of a parametric uncertain plant in order to guarantee the satisfaction of specifications. These specifications are defined by means of an interval reference model that represents the set of satisfactory time or frequency behaviors. The controller synthesis is then formulated as a set-inclusion problem in the frequency domain. Interval techniques for the solution of constraint satisfaction problems are applied to design fixed-structure controllers in a guaranteed manner. In particular, PID controllers are considered since they are widely used in industry.

Control theoryFrequency domainPID controllerControl engineeringInterval (mathematics)Set theoryReference modelConstraint satisfaction problemParametric statisticsMathematics2004 43rd IEEE Conference on Decision and Control (CDC) (IEEE Cat. No.04CH37601)
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Quantized State-Feedback Stabilization for Delayed Markovian Jump Linear Systems with Generally Incomplete Transition Rates

2014

Published version of an article in the journal: Abstract and Applied Analysis. Also available from the publisher at: http://dx.doi.org/10.1155/2014/961925 open Access This paper is concerned with the robust quantized state-feedback controller design problem for a class of continuous-time Markovian jump linear uncertain systems with general uncertain transition rates and input quantization. The uncertainties under consideration emerge in both system parameters and mode transition rates. This new uncertain model is more general than the existing ones and can be applicable to more practical situations because each transition rate can be completely unknown or only its estimate value is known. B…

Controller designArticle SubjectApplied Mathematicslcsh:MathematicsUncertain systemsAnalysis; Applied MathematicsLinear matrixTransition rate matrixlcsh:QA1-939VDP::Mathematics and natural science: 400::Mathematics: 410::Analysis: 411Markovian jump linear systemsQuantization (physics)Markovian jumpControl theorySystem parametersAnalysisMathematics
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Observer-Based Robust Control for Switched Stochastic Systems with Time-Varying Delay

2013

Published version of an article in the journal: Abstract and Applied Analysis. Also available from the publisher at: http://dx.doi.org/10.1155/2013/320703 Open Access This paper investigates the problem of observer-based robust H ∞ control for a class of switched stochastic systems with time-varying delay. Based on the average dwell time method, an exponential stability criterion for switched stochastic delay systems is proposed. Then, H ∞ performance analysis and observer-based robust H ∞ controller design for the underlying systems are developed. Finally, a numerical example is presented to illustrate the effectiveness of the proposed approach.

Controller designClass (computer programming)Observer (quantum physics)Article SubjectApplied Mathematicslcsh:Mathematicslcsh:QA1-939VDP::Mathematics and natural science: 400::Mathematics: 410::Analysis: 411Dwell timeExponential stabilityControl theoryObserver basedRobust controlAnalysisMathematicsAbstract and Applied Analysis
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Robust fault tolerant tracking controller design for a VTOL aircraft

2013

This paper deals with the fault tolerant control (FTC) design for a Vertical Takeoff and Landing (VTOL) aircraft subject to external disturbances and actuator faults. The aim is to synthesize a fault tolerant controller ensuring trajectory tracking for the nonlinear uncertain system represented by a Takagi-Sugeno (T-S) model. In order to design the FTC law, a proportional integral observer (PIO) is adopted which estimate both of the faults and the faulty system states. Based on the Lyapunov theory and ℓ2 optimization, the trajectory tracking performance and the stability of the closed loop system are analyzed. Sufficient conditions are obtained in terms of linear matrix inequalities (LMI). …

Controller designEngineeringComputer Networks and Communicationsbusiness.industryApplied MathematicsReliability (computer networking)Takagi-Sugeno modelsComputerApplications_COMPUTERSINOTHERSYSTEMSControl engineeringFault toleranceclosed loop systemAeronauticsControl and Systems EngineeringSignal ProcessingFlight safetyCommercial aviationbusinessfault tolerant control
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Discrete-time static output-feedback H<inf>∞</inf> controller design for vehicle suspensions

2014

This paper provides a direct and practical presentation of a novel methodology for static output-feedback controller design. The proposed design strategy has been successfully applied in the fields of control systems for seismic protection of large buildings and multi-building structures, control of offshore wind turbines, and active control of vehicle suspensions. The positive results obtained in these initial applications clearly indicate that this approach could be an effective tool in a large variety of control problems, for which an LMI formulation of the statefeedback version of the problem is available. The main objective of the paper is to facilitate a brief and friendly presentatio…

Controller designEngineeringOffshore wind powerDiscrete time and continuous timeControl theorybusiness.industryControl systemSymmetric matrixControl engineeringDesign strategybusinessDesign methods2014 International Conference on Mechatronics and Control (ICMC)
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