And yet another method for the identification of modal constants in Experimental Modal Analysis

Authors: Montalvão, D., Amafabia, D.M. and Silva, J.M.M.

Journal: IOMAC 2017 - 7th International Operational Modal Analysis Conference

Pages: 234-237

Abstract:

Modal Identification from Frequency Response Functions (FRFs) is a chapter of Experimental Modal Analysis (EMA) that many would consider as something from the past. Yet, in a previous work [2], a new approach to determine the modal damping factors from FRFs was proposed. Contrary to other modal identification methods which are based on the dynamic motion governing equations, the method used the dissipated energy per cycle of vibration as a starting point. The method used a plot of the sine of the phase of the receptance against its amplitude. In this paper, it will be shown that near resonant frequencies, its shape is elliptical, whereby the modal constants can be determined.

https://eprints.bournemouth.ac.uk/29156/

Source: Scopus

AND YET ANOTHER METHOD FOR THE IDENTIFICATION OF MODAL CONSTANTS IN EXPERIMENTAL MODAL ANALYSIS

Authors: Montalvao, D., Amafabia, D.M. and Silva, J.M.M.

Journal: 7TH IOMAC: INTERNATIONAL OPERATIONAL MODAL ANALYSIS CONFERENCE

Pages: 234-237

ISBN: 978-3-8440-5247-3

ISSN: 1610-4773

https://eprints.bournemouth.ac.uk/29156/

Source: Web of Science (Lite)

And yet another method for the identification of modal constants in experimental modal analysis

Authors: Montalvao, D., Amafabia, D.M. and Silva, J.M.M.

Conference: IOMAC'17 - 7th International Operational Modal Analysis Conference

Dates: 10-12 May 2017

Abstract:

Modal Identification from Frequency Response Functions (FRFs) is a chapter of Experimental Modal Analysis (EMA) that many would consider being closed in a book and covered in dust. Yet, in a previous paper from the same authors, a new approach to determine the modal damping factors from FRFs was proposed. Contrary to other modal identification methods which are based on the dynamic motion governing equations, the method used as a starting point the dissipated energy per cycle of vibration. For lightly damped systems with conveniently spaced modes, it produced quite accurate results, especially when compared to the method of the inverse. The method used a plot of the sine of the phase of the receptance against its amplitude, whereby damping was determined from the slope. In this paper, it will be shown that this plot has other special properties, whereby the real and imaginary parts of the modal constants can be determined from the plot through numerical extrapolation.

https://eprints.bournemouth.ac.uk/29156/

Source: Manual

And yet another method for the identification of modal constants in experimental modal analysis

Authors: Montalvão, D., Amafabia, D.M. and Silva, J.M.M.

Conference: IOMAC'17 - 7th International Operational Modal Analysis Conference

Abstract:

Modal Identification from Frequency Response Functions (FRFs) is a chapter of Experimental Modal Analysis (EMA) that many would consider being closed in a book and covered in dust. Yet, in a previous paper from the same authors, a new approach to determine the modal damping factors from FRFs was proposed. Contrary to other modal identification methods which are based on the dynamic motion governing equations, the method used as a starting point the dissipated energy per cycle of vibration. For lightly damped systems with conveniently spaced modes, it produced quite accurate results, especially when compared to the method of the inverse. The method used a plot of the sine of the phase of the receptance against its amplitude, whereby damping was determined from the slope. In this paper, it will be shown that this plot has other special properties, whereby the real and imaginary parts of the modal constants can be determined from the plot through numerical extrapolation.

https://eprints.bournemouth.ac.uk/29156/

Source: BURO EPrints