DYNAMIC SMALL-SCALE RISER MODEL EXPERIMENTS: A PHYSICS-BASED ALGORITHM TO RECOVER LOST MEASUREMENTS FROM OPTICAL TRACKING SYSTEMS

Author(s)

Vernizzi, Guilherme J. ; Maciel, Vitor S. F. ; Defensor Filho, Wagner A. ; Orsino, Renato M. M. ; Franzini, Guilherme R. ; Pesce, Celso P.

• Document type: Journal article
• Source: PROCEEDINGS OF ASME 2023 42ND INTERNATIONAL CONFERENCE ON OCEAN, OFFSHORE & ARCTIC ENGINEERING, OMAE2023, VOL 7; v. N/A, p. 10-pg., 2023-01-01.

Abstract

While data acquisition to obtain structural displacement fields is traditionally made with the use of strain gauges and accelerometers, recent focus has been put on the use of optical tracking systems for this purpose. Amongst the advantages of this approach, the lack of interference with the investigated structure and the direct measurement of the displacements can be mentioned. However, in recent experimental efforts in which this approach was taken, two types of issues were observed, namely the presence of spurious measurements or the temporary loss of tracking for some targets. The present work focuses on a novel methodology aiming at pre-processing the raw data acquired using optical tracking systems, based on well known mathematical tools. Using a physics-based algorithm, the effects of spurious measurements is diminished and the missing data is adequately interpolated, thus generating a dataset which is much more adequate for subsequent analyses. Even in the case in which no issues occur, this dataset enhances the available measurements since it provides a continuous function for the displacement field, rather than a scatter of a limited amount of points. Both experimental and fabricated numerical sets of data are used to evaluate the capabilities of the algorithm. It is shown that the methodology herein presented leads to an enhanced dataset in which the limitations of optical tracking systems have remarkably less effect on subsequent analyses. (AU)

• FAPESP's process: 21/04434-1 - Passive suppression of internal axial-flow-induced vibrations of a cantilevered pipe discharging fluid using non-linear vibration absorber: a numerical, analytical and experimental study
• Grantee: Vitor Schwenck Franco Maciel
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• FAPESP's process: 16/25457-1 - Analytical-numerical investigations on vortex-induced vibrations and parametric excitation phenomena in flexible cylinders in vertical and catenary configurations
• Grantee: Guilherme Jorge Vernizzi Lopes
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)