Search results for "Automatic control"

showing 3 items of 53 documents

IMPROVING CNC MACHINE TOOLS ACCURACY USING MODELING AND COMPUTER SIMULATION TECHNIQUES

2007

Abstract The position was one of the first parameters that required the introduction of automatic control process. One of the most representative applications is represented by the feed drives of the computer numerically controlled (CNC) machine tools. Today, it is possible to use computer simulation techniques in analysing and synthesising position control systems. Thus, the behaviour of the CNC machine tools feed drives can be treated much more realistically. It is the purpose of this paper to show how simulation can be used to accurately represent, predict and improve the performance of a CNC machine tool feed servo drives.

business.product_categoryAutomatic controlPosition (vector)Computer scienceNumerical controlProcess (computing)Servo driveComputerApplications_COMPUTERSINOTHERSYSTEMSControl engineeringbusinessTransfer functionSimulationMachine toolIFAC Proceedings Volumes
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A Nonlinear Circulatory Model for Artificial Heart Studies

1983

Animals with total artificial heart replacement (TAH) have survived for up to 9 months with manually controlled driving systems. A certain physiological control is provided by the animals intact peripheral regulation resulting in pathological venous hemodynamics, expressing the needs for a technical automatic control system, replacing the natural sympathetic stimulation and Starlings Law of the heart. A nonlinear dynamic mathematical model of the human cardiovascular system (CVSM) containing the systemic and pulmonary components was outlined and verified, which is employable to analyse the hemodynamic behaviour under normal and abnormal states. By modifying this model, assuming that cardiac…

medicine.medical_specialtyCardiac outputAutomatic controlbusiness.industryHemodynamicsOptimal controllaw.inventionBlood pumplawArtificial heartInternal medicineCirculatory systemAortic pressureCardiologyMedicinebusiness
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Min-Type Control Strategy of a DC-DC Synchronous Boost Converter

2019

International audience; This paper presents the analysis and design of a min-type strategy to control a synchronous boost converter in continuous conduction mode. The strategy uses a nonlinear switching surface to establish the change of topology in the converter and is analyzed by means of a sliding-mode control approach. Subsequently, the min-type strategy is modified by a hybrid control formulation, which introduces a hysteresis width and a dwell-time to obtain a finite switching frequency in the start-up and steady-state respectively. The hybrid control formulation is implemented digitally by means of a microprocessor which processes the samples of inductor current and capacitor voltage…

min-type controlstart-upComputer scienceTopology (electrical circuits)02 engineering and technologyInductorSliding mode controllaw.inventionSettore ING-INF/04 - AutomaticaControl theorylaw[INFO.INFO-AU]Computer Science [cs]/Automatic Control Engineering0202 electrical engineering electronic engineering information engineeringElectrical and Electronic EngineeringIndex Terms-Synchronous boost converterSynchronous boost converter020208 electrical & electronic engineeringhybrid controlPower (physics)HysteresisMicroprocessorNonlinear systemsliding-mode controlControl and Systems EngineeringCapacitor voltagesliding-mode control (SMC)Boost converterTransient (oscillation)
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