Abstract:
This study presents experimental tests of VIV over an orthotropically stiffened cantilevered cylinder, equipped with piezoceramic components over a flat bar in its interior. The displacements of the cantilever were measured using an optical system tracking reflective targets distributed along the model. Additionally, the resulting reaction forces and the electric tension output from the attached piezoelectric components were measured. The experimental campaign employed two methodologies: constant towing velocities until a steady state regime was reached, and constant low acceleration until the maximum towing velocity was reached, followed by deceleration at the same rate. The reduced velocities reached up to 20, which allowed for the exploration of various VIV frequencies and response branches. Modal decomposition using the Galerkin method is employed for data analysis, along with time and frequency domain techniques such as Fourier Transform and Hilbert-Huang Transform. The results indicate clear hysteretic behaviour of the system as modal responses transition between the amplitude response branches. The analysis and discussion of the electric power output are also addressed.
Referência:
MADI, Letícia Siqueira; VERNIZZI, Guilherme Jorge; DEFENSOR FILHO, Wagner Antonio; KOGISHI; Andre Mitsuo; PESCE, Celso P. Piezoelectric energy harvesting from VIV on cantilevered flexible cylinders with orthotropic bending stiffiness: experimental investigation of varying flow effects. In: INTERNATIONAL SYMPOSIUM ON FLUID-STRUCTURE INTERACTIONS, FLOW-SOUND INTERACTIONS, FLOW-INDUCED VIBRATION AND NOISE, 10., 2024, Foz do Iguaçu. Proceedings… 10p.
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