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Understanding importance of positive and negative signs of optimized weights used in the sum of weighted normalized Fourier spectrum/envelope spectrum for machine condition monitoring

Condition MonitoringEngineeringMeasurementMachine Condition MonitoringStructural Health MonitoringComputer EngineeringSystems EngineeringEducationNegative SignsSpectral AnalysisSpectrum EstimationTimefrequency AnalysisInstrumentationSignal ProcessingFourier Spectrum/envelope Spectrum