Parametric excitation of an immersed, vertical and slender beam using reduced-order models: influence of hydrodynamic coefficients

Vortex-induced vibration dynamics of a flexible fluid-conveying marine riser subjected to axial harmonic tension

“…Recently, the effects of pre-tension and axial stiffness on vibration amplitudes and suppression characteristics were experimentally investigated [30]. Then, experiments and numerical simulations were performed to investigate dynamic responses of a flexible riser subjected to top axial harmonic excitation in detail [31][32][33]. Although these researches explore some excitation mechanisms, it should be emphasized that the hydrodynamic force in their model is elaborated by the Morison's expression rather than wake vortex oscillator model.…”

Experimental analysis of fluid-structure interaction phenomena on a vertical flexible cylinder: modal coeficients and parametric resonance.

“…al (2014), where a flexible cylinder is transversally excited with sinusoidal displacements applied at the extremities, does not investigate the modal added mass, also using C a = 1. Franzini et al (2016), using nonlinear oscillators obtained through the Galerkin's projection technique, using sinusoidal modes, investigate the response sensitivity of the vertical flexible cylinder subjected to parametric excitation to the parameters C D and C a , varied within a significant interval.…”

“…It is also possible to use a non-linear Reduced Order Model (ROM) in order to evaluate the effect of some hydrodynamical coefficients, as added mass and non-linear damping; Franzini et al (2015) and Franzini et al (2016). It would be interesting to compare the results obtained using the analytical-numerical ROM with the experimental results in water obtained with modal decomposition techniques.…”

“…(a) Consolidation of an analysis methodology in which conventional techniques are merged, such as: statistical methods, spectrum analysis (energy spectrum along model span) and time-domain analysis (amplitude-time scalograms); see LIFE&MO (2012c, 2012d; (b) Crystallization of the time-frequency spectrum analysis using the HHT; LIFE&MO (2012b), , Franzini et al (2013), Pereira et al (2013) Franzini et al (2015 and Franzini et al (2016); (c) Development of a modal decomposition method in VIV studies in flexible cylinders; as it may be regarded in LIFE&MO (2012d) and Franzini et al (2014).…”

“…There is also a branch using Reduced Order Models (ROMs) obtained from modal decomposition in order to study modal added mass and mean drag force affect; see Franzini et al (2015) Franzini et al (2016.…”