Calibrated Wake Oscillator Model of Horizontal Flexible Structure Moving in Uniform Flow

2019 ◽  
Author(s):  
Ekaterina Pavlovskaia
Keyword(s):  
Uniform Flow ◽  
Oscillator Model ◽  
Flexible Structure ◽  
Wake Oscillator Model ◽  
Wake Oscillator

Semi-Submersible Floater’s VIM Simulation Method for Mooring Line Safety Assessment

2018 ◽  
Author(s):  
Toshifumi Fujiwara
Keyword(s):  
Safety Assessment ◽  
Simulation Method ◽  
Oscillator Model ◽  
Design Stage ◽  
Mooring Line ◽  
Floating Structure ◽  
Mooring Lines ◽  
Wake Oscillator Model ◽  
Wake Oscillator ◽  
The Time Domain

The author proposed the Vortex-induced Motion (VIM) simulation method of a semi-submersible type offshore floating structure using the wake oscillator model based on the potential theory and model test data. This method is easy to use for the time-domain simulation of the VIM amplitude, that is in-line, transverse and yaw motions, of the semi-submersible floater in case of being demented mooring safety assessment of that. The simulation method presented in this paper was modified the single circular floater simulation method with the wake oscillator model for a semi-submersible floater. Some empirical parameters, obtained from the systematic model tests used many semi-submersible floaters, are only decided from external form of the semi-submersible floaters, that is the column / lower hull ratio etc. This simulation method is able to indicate general VIM trend and to be used for the assessment of mooring lines safety in the design stage. Using the VIM amplitude simulation, fatigue damage of mooring lines on one sample semi-submersible floater was investigated as an example.

Vortex-Induced Dynamic Response of Submerged Floating Tunnel Tether Based on Wake Oscillator Model

2014 ◽  
Vol 919-921 ◽  
pp. 1262-1265 ◽  
Author(s):  
Zhi Bin Su ◽  
Sheng Nan Sun
Keyword(s):  
Axial Force ◽  
Parametric Resonance ◽  
Oscillator Model ◽  
Linear Vibration ◽  
Wake Oscillator Model ◽  
Wake Oscillator ◽  
Runge Kutta Method ◽  
Submerged Floating Tunnel ◽  
Combined Action ◽  
Set Up

To study the vibration response of submerged floating tunnel tether under the combined action of vortex-induced vibration and parametric vibration, a non-linear vibration equation based on wake oscillator model is set up taking the geometric nonlinearity of tether into account, in which effect of tube on tether is simplified as axial excitation. An approximate numerical solution of planning submerged floating tunnel tether is obtained by applying Galerkin method and Runge-kutta method. The variation degree of mid-span displacement response and axial force of tether is analyzed when the vortex-induced resonance and parametric resonance occur. The results show that, when vortex-induced resonance and parametric resonance occur simultaneously, the mid-span displacement and axial force of tether increase dramatically; the tether sag effect results in the asymmetry of tether mid-span vibration amplitude.

Dynamics of the Iwan-Blevins wake oscillator model

1986 ◽  
Vol 21 (4) ◽  
pp. 291-302 ◽  
Author(s):  
Aubrey B. Poore ◽  
Eusebius J. Doedel ◽  
Jack E. Cermak
Keyword(s):  
Oscillator Model ◽  
Wake Oscillator Model ◽  
Wake Oscillator

Three-dimensional vortex-induced vibrations of a circular cylinder predicted using a wake oscillator model

2021 ◽  
Vol 80 ◽  
pp. 103078
Author(s):  
Yun Gao ◽  
Zhuangzhuang Zhang ◽  
Ganghui Pan ◽  
Geng Peng ◽  
Lei Liu ◽  
...  
Keyword(s):  
Circular Cylinder ◽  
Three Dimensional ◽  
Oscillator Model ◽  
Wake Oscillator Model ◽  
Wake Oscillator ◽  
Vortex Induced Vibrations
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