Search results for "Error compensation"

showing 3 items of 3 documents

Compensation of compliance errors in parallel manipulators composed of non-perfect kinematic chains

2012

The paper is devoted to the compliance errors compensation for parallel manipulators under external loading. Proposed approach is based on the non-linear stiffness modeling and reduces to a proper adjusting of a target trajectory. In contrast to previous works, in addition to compliance errors caused by machining forces, the problem of assembling errors caused by inaccuracy in the kinematic chains is considered. The advantages and practical significance of the proposed approach are illustrated by examples that deal with groove milling with Orthoglide manipulator.

FOS: Computer and information sciences0209 industrial biotechnologyComputer sciencenonlinear stiffness modelingcompliance error compensation02 engineering and technologyKinematicsCompensation (engineering)Computer Science::RoboticsComputer Science - Robotics020901 industrial engineering & automation0203 mechanical engineeringMachiningControl theorymedicine[INFO.INFO-RB]Computer Science [cs]/Robotics [cs.RO]ManipulatorGroove (engineering)Parallel manipulatorStiffnessparallel robots020303 mechanical engineering & transportsTrajectorymedicine.symptomnon-perfect manipulatorsRobotics (cs.RO)
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Compliance error compensation technique for parallel robots composed of non-perfect serial chains

2012

The paper presents the compliance errors compensation technique for over-constrained parallel manipulators under external and internal loadings. This technique is based on the non-linear stiffness modeling which is able to take into account the influence of non-perfect geometry of serial chains caused by manufacturing errors. Within the developed technique, the deviation compensation reduces to an adjustment of a target trajectory that is modified in the off-line mode. The advantages and practical significance of the proposed technique are illustrated by an example that deals with groove milling by the Orthoglide manipulator that considers different locations of the workpiece. It is also de…

FOS: Computer and information sciences0209 industrial biotechnologyEngineeringGeneral Mathematicsnonlinear stiffness modelingcompliance error compensation02 engineering and technologyIndustrial and Manufacturing EngineeringCompensation (engineering)Computer Science::RoboticsSuperposition principleComputer Science - Robotics020901 industrial engineering & automation0203 mechanical engineeringControl theorymedicine[INFO.INFO-RB]Computer Science [cs]/Robotics [cs.RO]ManipulatorGroove (engineering)business.industryMode (statistics)Parallel manipulatorStiffnessComputer Science Applications020303 mechanical engineering & transportsControl and Systems EngineeringTrajectoryParallel robotsmedicine.symptombusinessnon-perfect manipulatorsRobotics (cs.RO)Software
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Improvement of Hall Effect Current Transducer Metrological Performances in the Presence of Harmonic Distortion

2010

The performance of Hall effect current transducers (HECTs), under distorted waveform conditions, is usually characterized by means of a frequency response test. In this paper, it was investigated if frequency response is able to correctly evaluate the ratio and the phase errors under distorted conditions. Two HECTs, with the accuracy class level of 1% and 0.5%, respectively, were experimentally characterized under two conditions: 1) sinusoidal excitation with frequencies ranging from 50 to 750 Hz, which is the well-known frequency response test, and 2) nonsinusoidal excitation using fundamental frequency and one harmonic with adjusted amplitude and phase shift. It was found that ratio and p…

Frequency responseElectric current measurementCurrent measurement current transducer frequency response hall effect devices harmonic distortion power system harmonics.AcousticsTransducersPhase (waves)GyratorsNon-sinusoidal excitationHarmonic distortionAccuracy levelFundamental frequenciesHarmonic analysisPhase errorElectric currentsError compensationFrequency responseFrequency response testsWaveformSinusoidal excitationsPhase shiftElectrical and Electronic EngineeringInstrumentationPhysicsTotal harmonic distortionElectric power distributionHall effectCurrent measurementsMetrological performanceCurrent transducerFundamental frequencyLight measurementAmplitudeAccuracy classHarmonicsMagnetic field effectsHarmonicHarmonic amplitudeSettore ING-INF/07 - Misure Elettriche E ElettronicheDistorted waveformsHarmonic componentsHall effect devicesIEEE Transactions on Instrumentation and Measurement
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