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2021 | OriginalPaper | Chapter

Signal Analysis Through the Ensemble Empirical Mode Decomposition and Hilbert-Huang Transform-Application to Vortex Shedding

Authors : Ana Paula Ost, Alexandre Vagtinski de Paula, Sergio Viçosa Möller

Published in: Vibration Engineering and Technology of Machinery

Publisher: Springer International Publishing

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Abstract

This paper presents the application of the Hilbert-Huang transform as a tool for signal analysis. The Hilbert-Huang transform (HHT) enables the analysis of nonstationary and nonlinear data being a combination of the Empirical Mode Decomposition (EMD) and the Hilbert Spectral Analysis (HSA). A noise assisted data analysis method, called Ensemble Empirical Mode Decomposition (EEMD), based on the statistical properties of white noise, was used to overcome EMD problems like mode mixing, and successfully deal with the scale separation. The EEMD was applied to each velocity signal to obtain a collection of Intrinsic Mode Functions (IMF). Vortex shedding in turbulent flows past circular cylinders represents a canonical problem suitable for validating new approaches in experimental analysis, as it has well known features. Experimental data in form of time series from hot wire signals of the turbulent flow past circular cylinders in an aerodynamic channel are employed for the analysis. Cylinder had a diameter of 32 mm. The Reynolds numbers varied from 1.05 × 104 to 3.28 × 104. EEMD provided the localization of particular events in time-frequency space, allowing a complete physical interpretation of the dynamic processes at the corresponding flow scales. The Hilbert Spectral analysis provided an accurate representation of the amplitude-frequency-time distribution of the flow. The most energetic IMFs and the corresponding flow scales were identified from the Mean Square Energy of the IMF components. The application of HHT to the analysis of the hot wire signals obtained in the turbulent wake behind cylinders showed that it is a useful tool for the analysis of turbulent data, allowing the identification of turbulent structures and flow scales.

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Metadata
Title
Signal Analysis Through the Ensemble Empirical Mode Decomposition and Hilbert-Huang Transform-Application to Vortex Shedding
Authors
Ana Paula Ost
Alexandre Vagtinski de Paula
Sergio Viçosa Möller
Copyright Year
2021
DOI
https://doi.org/10.1007/978-3-030-60694-7_6

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