Search results for " Fourier transforms"

showing 4 items of 4 documents

Vibration signature analysis for monitoring rotor broken bar in double squirrel cage induction motors based on wavelet analysis

2014

Purpose – The purpose of this paper is to present a diagnosis technique, for rotor broken bar in double cage induction motor, based on advanced use of wavelet transform analysis. The proposed technique is experimentally validated. Design/methodology/approach – The proposed approach is based on a combined use of frequency sliding and wavelet transform analysis, to isolate the contribution of the rotor fault components issued from vibration signals in a single frequency band. Findings – The proposed technique is reliable for tracking the rotor fault components over time-frequency domain. The quantitative analysis results based on this technique are the proof of its robustness. Research limit…

EngineeringFrequency bandElectrical machines Fault analysis Condition monitoring Fourier transforms Rotating machines RotorsSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciWaveletControl theoryRobustness (computer science)Electrical machineRotorComputational Theory and MathematicElectrical and Electronic EngineeringPractical implicationsVibration signaturebusiness.industrySquirrel-cage rotorApplied MathematicsComputer Science Applications1707 Computer Vision and Pattern RecognitionComputer Science ApplicationsCondition monitoringVibrationComputational Theory and MathematicsFault analysiFourier transformRotating machinebusinessInduction motor
researchProduct

A PC-based instrument for harmonics and interharmonics measurement in power supply systems

2004

Abstract Growing interest on power quality has led international working groups to define new standards for testing and measurement techniques to apply to power systems. Special attention has been paid to harmonic and interharmonic measurements. Here, the authors introduce a PC-based instrument capable of synchronising sampling frequency with fundamental frequency in order to perform on-line voltage or current distortion analysis. The instrument has been developed in accordance with currently available standards and international documents, IEC 61000-4-7 Ed. 2002, IEC 61000-4-30 Ed. 2003, Draft Guide IEEE P1159.1 Ed. 2003 and limits given by IEC 61000 Part. 3. A detailed description of the …

Engineeringbusiness.industryApplied MathematicsElectrical engineeringFundamental frequencyCondensed Matter PhysicsDiscrete Fourier transformsPower (physics)spectral leakageElectric power systemHarmonicsElectronic engineeringHarmonicPower qualityFrequency estimationElectric powerElectrical and Electronic EngineeringbusinessInstrumentationVoltageMeasurement
researchProduct

A low cost and easy re-configurable instrument for power quality survey

2004

In this document the development of a low cost and user friendly PC-based instrument for power quality measurement is proposed, according to IEC 61000-4-7 and standard IEC 61000-4-30. It is an easily re-configurable instrument able to measure harmonics, interharmonics and amplitude disturbances and supply unbalance. In order to verify its accuracy, the instrument has been tested according standard test procedures, by means of a built-up calibration test bench.

Measure (data warehouse)Total harmonic distortionEngineeringUser Friendlybusiness.industryElectromagnetic compatibilityDiscrete Fourier transformsReliability engineeringspectral leakageHarmonicsCalibrationElectronic engineeringPower qualityFrequency estimationbusinessVoltageProceedings of the 21st IEEE Instrumentation and Measurement Technology Conference (IEEE Cat. No.04CH37510)
researchProduct

Complex singularities and PDEs

2015

In this paper we give a review on the computational methods used to capture and characterize the complex singularities developed by some relevant PDEs. We begin by reviewing the classical singularity tracking method and give an example of application using the Burgers equation as a case study. This method is based on the analysis of the Fourier spectrum of the solution and it allows to determine and characterize the complex singularity closest to the real domain. We then introduce other methods generally used to detect the hidden singularities. In particular we show some applications of the Padé approximation, of the Kida method, and of Borel-Polya method. We apply these techniques to the s…

Physics::Fluid DynamicsComplex singularity Fourier transforms Padé approximation Borel and power series methods dispersive shocks fluid mechanics zero viscosity.Fluid Dynamics (physics.flu-dyn)FOS: Physical sciencesMathematical Physics (math-ph)Physics - Fluid DynamicsMathematical Physics
researchProduct