Search results for "Control theory"

showing 10 items of 1333 documents

Event-Triggered Nonlinear Control of OWC Ocean Wave Energy Plant

2018

This paper presents event-triggered nonlinear controllers for oscillating water column (OWC) ocean wave energy plant. The study is based on event-triggered backstepping controller (ET-BSC) and event-triggered sliding mode controller (ET-SMC) to control the rotational speed of an OWC turbine coupled to a generator. The designed controllers are capable to avoid the stalling of the Wells turbine so as to maximize its output power. The aim of event-triggered control is to minimize the control updates, thus providing efficient utilization of resources without compromising the OWC performance. In this regard, aperiodic sampling has been applied using an event-triggering rule derived from Lyapunov…

Lyapunov stabilityRenewable Energy Sustainability and the EnvironmentControl theoryComputer science020209 energy0202 electrical engineering electronic engineering information engineeringOscillating Water ColumnTorque02 engineering and technologyNonlinear controlTurbineWells turbinePower (physics)IEEE Transactions on Sustainable Energy
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Stabilization of a Class of Stochastic Nonlinear Systems

2013

This paper addresses two control schemes for stochastic nonlinear systems. Firstly, an adaptive controller is designed for a class of motion equations. Then, a robust finite-time control scheme is proposed to stabilize a class of nonlinear stochastic systems. The stability of the closed-loop systems is established based on stochastic Lyapunov stability theorems. Links between these two methods are given. The efficiency of the control schemes is evaluated using numerical simulations.

Lyapunov stabilityScheme (programming language)Class (set theory)Article SubjectGeneral Mathematicslcsh:MathematicsGeneral EngineeringStability (learning theory)MathematicsofComputing_NUMERICALANALYSISEquations of motionlcsh:QA1-939Nonlinear systemControl theorylcsh:TA1-2040lcsh:Engineering (General). Civil engineering (General)computerMathematicscomputer.programming_languageMathematical Problems in Engineering
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Dynamic Output-Feedback Passivity Control for Fuzzy Systems under Variable Sampling

2013

Published version of an article in the journal: Mathematical Problems in Engineering. Also available from the publisher at: http://dx.doi.org/10.1155/2013/767093 Open Access This paper concerns the problem of dynamic output-feedback control for a class of nonlinear systems with nonuniform uncertain sampling via Takagi-Sugeno (T-S) fuzzy control approach. The sampling is not required to be periodic, and the state variables are not required to be measurable. A new type fuzzy dynamic output-feedback sampled-data controller is constructed, and a novel time-dependent Lyapunov-Krasovskii functional is chosen for fuzzy systems under variable sampling. By using Lyapunov stability theory, a sufficie…

Lyapunov stabilityState variableMathematical optimizationArticle Subjectlcsh:MathematicsGeneral MathematicsGeneral EngineeringSampling (statistics)Fuzzy control systemlcsh:QA1-939Fuzzy logicNonlinear systemlcsh:TA1-2040Control theoryConvex optimizationVDP::Matematikk og Naturvitenskap: 400::Matematikk: 410::Anvendt matematikk: 413lcsh:Engineering (General). Civil engineering (General)MathematicsMathematical Problems in Engineering
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Impulsive control on the synchronization for a class of chaotic Systems

2014

In this paper, the impulsive control problem on the synchronization for a class of chaotic systems is discussed. Based on Lyapunov stability theory, the new impulsive synchronization strategy is presented to realize the chaos synchronization and possesses the wider scope of application. Finally the numerical simulation examples are given to demonstrate the effectiveness of our theoretical results.

Lyapunov stabilitychaos systemClass (set theory)Computer simulationSynchronization of chaoschaos system; impulsive switching; Lyapunov stability; synchronization; Electrical and Electronic Engineering; Control and Systems EngineeringLyapunov exponentimpulsive switchingSynchronizationNonlinear Sciences::Chaotic DynamicsCHAOS (operating system)symbols.namesakeControl and Systems EngineeringControl theoryLyapunov stabilitysymbolsElectrical and Electronic EngineeringLyapunov redesignsynchronizationMathematics2014 IEEE 23rd International Symposium on Industrial Electronics (ISIE)
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H<inf>∞</inf> controller design for the synchronization of a hyper-chaotic system

2013

In this paper, the robust control on the synchronization of a hyper-chaotic system is investigated. Based on Lyapunov stability theory and linear matrix inequality techniques, the multi-dimensional and the single-dimensional robust H∞ synchronization controllers are constructed for the possible application in practical engineering. Some numerical simulations are provided to demonstrate the effectiveness of the presented controllers.

Lyapunov stabilitysymbols.namesakeControl theoryChaoticsymbolsLinear matrix inequalityControl engineeringLyapunov equationLyapunov exponentRobust controlLyapunov redesignSynchronizationMathematics2013 9th Asian Control Conference (ASCC)
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Simulation of PLL with impulse signals in MATLAB: Limitations, hidden oscillations, and pull-in range

2015

The limitations of PLL simulation are demonstrated on an example of phase-locked loop with triangular phase detector characteristic. It is shown that simulation in MatLab may not reveal periodic oscillations (e.g. such as hidden oscillations) and thus may lead to unreliable conclusions on the width of pull-in range.

MATLABta213hidden oscillationsComputer sciencephase-locked loopsta111Periodic oscillationsImpulse (physics)Phase-locked loopControl theoryPhase detector characteristicMATLABcomputerMatLabcomputer.programming_language2015 7th International Congress on Ultra Modern Telecommunications and Control Systems and Workshops (ICUMT)
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Using the modern CNC controllers capabilities for estimating the machining forces during the milling process

2017

Machining forces can nowadays be measured by using 3D dynamometers, which are usually very expensive devices and hardly available for most of the CNC machine-tools users. On the other hand, modern CNC controllers have nowadays the ability to display and save many outputs within the machining process, such as the currents or even the torques at the shaft's level for the feed motors on each axis. These outputs can be used for estimating the machining forces, but it is to be noticed that the above-mentioned currents and torques are proportional with the overall resistant forces, which includes not only technological forces, but also friction, inertial and pre-tensioning forces. This paper pres…

Machining processEngineeringInertial frame of referenceDynamometerbusiness.industryProcess (computing)Mechanical engineeringComputerApplications_COMPUTERSINOTHERSYSTEMSMachininglcsh:TA1-2040Control theoryTorquelcsh:Engineering (General). Civil engineering (General)businessMATEC Web of Conferences
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The Shaping of Flux Density at the Air Gap of Small DC Motors with Different Permanent-Magnet Poles

1995

Design, operation and reliability of permanent-magnet DC micromotors are highly dependent of the magnet employed, i.e. of its demagnetization curve, type of magnetization (either radial or tangential), size and position within the micromotor as well as of its shape.

MagnetizationReliability (semiconductor)Materials scienceControl theoryPosition (vector)MagnetMicromotorDemagnetizing fieldMechanicsAir gap (plumbing)DC motor
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The Inactivation Principle: Mathematical Solutions Minimizing the Absolute Work and Biological Implications for the Planning of Arm Movements

2008

An important question in the literature focusing on motor control is to determine which laws drive biological limb movements. This question has prompted numerous investigations analyzing arm movements in both humans and monkeys. Many theories assume that among all possible movements the one actually performed satisfies an optimality criterion. In the framework of optimal control theory, a first approach is to choose a cost function and test whether the proposed model fits with experimental data. A second approach (generally considered as the more difficult) is to infer the cost function from behavioral data. The cost proposed here includes a term called the absolute work of forces, reflecti…

MaleMESH: Range of Motion ArticularMESH : Physical ExertionMESH : MovementOptimality criterion[SDV.MHEP.PHY] Life Sciences [q-bio]/Human health and pathology/Tissues and Organs [q-bio.TO]Computer scienceMESH: Muscle ContractionMESH: GravitationMESH : Models BiologicalMESH: MovementKinematicsMESH: Postural BalanceMESH : Gravitation0302 clinical medicineNeuroscience/Motor SystemsMESH : FeedbackMESH : BiomechanicsRange of Motion ArticularMESH: ArmMESH : Jointslcsh:QH301-705.5Postural BalanceMESH: Biomechanics0303 health sciencesNeuroscience/Behavioral NeuroscienceEcology[ SDV.MHEP.PHY ] Life Sciences [q-bio]/Human health and pathology/Tissues and Organs [q-bio.TO]MESH: FeedbackMESH : AdultBiomechanical PhenomenaMathematical theoryMESH: JointsComputational Theory and MathematicsModeling and SimulationArmResearch ArticleGravitationMuscle ContractionComputer Science/Systems and Control TheoryAdultMESH : MaleMovementPhysical ExertionComputational Biology/Computational NeuroscienceMESH: Psychomotor PerformanceModels BiologicalMESH : ArmFeedbackMESH: Physical Exertion03 medical and health sciencesCellular and Molecular NeuroscienceMESH : Postural BalanceControl theory[SDV.MHEP.PHY]Life Sciences [q-bio]/Human health and pathology/Tissues and Organs [q-bio.TO]GeneticsHumansNeuroscience/Theoretical NeuroscienceMolecular BiologyEcology Evolution Behavior and SystematicsSimulation030304 developmental biologyMESH: HumansMESH : HumansWork (physics)MESH: Models BiologicalMotor controlMESH: AdultMESH : Psychomotor PerformanceFunction (mathematics)Optimal controlMESH: MaleTerm (time)MESH : Range of Motion Articularlcsh:Biology (General)MESH : Muscle ContractionJoints030217 neurology & neurosurgeryMathematicsPsychomotor PerformancePLoS Computational Biology
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Relations Between Autonomous Motivation and Leisure-Time Physical Activity Participation: The Mediating Role of Self-Regulation Techniques

2016

This study tested the predictive validity of a multitheory process model in which the effect of autonomous motivation from self-determination theory on physical activity participation is mediated by the adoption of self-regulatory techniques based on control theory. Finnish adolescents (N = 411, aged 17–19) completed a prospective survey including validated measures of the predictors and physical activity, at baseline and after one month (N = 177). A subsample used an accelerometer to objectively measure physical activity and further validate the physical activity self-report assessment tool (n = 44). Autonomous motivation statistically significantly predicted action planning, coping planni…

MalePredictive validityControl theory (sociology)AdolescenteducationIndividualityPsychological interventionPhysical activityModels PsychologicalAffect (psychology)Developmental psychology03 medical and health sciencesLeisure Activities0302 clinical medicineAccelerometryAdaptation PsychologicalHumansProspective Studies030212 general & internal medicineExerciseFinlandInternal-External ControlApplied PsychologyMotivation030229 sport sciencesInternal-External Control5144 Social psychologyAction planningPersonal AutonomySelf-monitoringFemalePsychology
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