Abstract
A time-domain 3 Degrees of Freedom model is developed to investigate nonlinear dynamics and impact loads during float-over installations, which generally involve multi-body interactions between wave-induced vessel motions and nonlinear constraint components. By replacing the time-consuming convolution in calculating the retardation function, a more efficient method, i.e. state-space model, is applied to evaluate part of the radiation force. The established model, incorporating the multi-body interactions, is applied to study the nonlinear impact on Leg Mating Unit (LMU) by considering the sway, heave and roll motions of the float-over system. The structural characteristics are considered when modelling the characteristics of LMU. The dynamic behaviors of a given system is investigated in the form of bifurcation diagrams, along with impact map, amplitude spectrum and power spectral density (PSD). It is found that bifurcation phenomena, or a large angle of docking cone could dominate the installation due to the increased impact loads.
| Original language | English |
|---|---|
| Pages (from-to) | 60-78 |
| Number of pages | 19 |
| Journal | Applied Ocean Research |
| Volume | 65 |
| DOIs | |
| Publication status | Published - 1 Apr 2017 |
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Nonlinear dynamics and impact load in float-over installation. / Hu, Zhihuan; Li, Xin; Zhao, Wenhua; Wu, Xiao.
In: Applied Ocean Research, Vol. 65, 01.04.2017, p. 60-78.Research output: Contribution to journal › Article
TY - JOUR
T1 - Nonlinear dynamics and impact load in float-over installation
AU - Hu, Zhihuan
AU - Li, Xin
AU - Zhao, Wenhua
AU - Wu, Xiao
PY - 2017/4/1
Y1 - 2017/4/1
N2 - A time-domain 3 Degrees of Freedom model is developed to investigate nonlinear dynamics and impact loads during float-over installations, which generally involve multi-body interactions between wave-induced vessel motions and nonlinear constraint components. By replacing the time-consuming convolution in calculating the retardation function, a more efficient method, i.e. state-space model, is applied to evaluate part of the radiation force. The established model, incorporating the multi-body interactions, is applied to study the nonlinear impact on Leg Mating Unit (LMU) by considering the sway, heave and roll motions of the float-over system. The structural characteristics are considered when modelling the characteristics of LMU. The dynamic behaviors of a given system is investigated in the form of bifurcation diagrams, along with impact map, amplitude spectrum and power spectral density (PSD). It is found that bifurcation phenomena, or a large angle of docking cone could dominate the installation due to the increased impact loads.
AB - A time-domain 3 Degrees of Freedom model is developed to investigate nonlinear dynamics and impact loads during float-over installations, which generally involve multi-body interactions between wave-induced vessel motions and nonlinear constraint components. By replacing the time-consuming convolution in calculating the retardation function, a more efficient method, i.e. state-space model, is applied to evaluate part of the radiation force. The established model, incorporating the multi-body interactions, is applied to study the nonlinear impact on Leg Mating Unit (LMU) by considering the sway, heave and roll motions of the float-over system. The structural characteristics are considered when modelling the characteristics of LMU. The dynamic behaviors of a given system is investigated in the form of bifurcation diagrams, along with impact map, amplitude spectrum and power spectral density (PSD). It is found that bifurcation phenomena, or a large angle of docking cone could dominate the installation due to the increased impact loads.
KW - Bifurcation phenomena
KW - Float-over installation
KW - Impact load
KW - Non-linear dynamics
KW - State-space model
UR - http://www.scopus.com/inward/record.url?scp=85016640065&partnerID=8YFLogxK
U2 - 10.1016/j.apor.2017.03.013
DO - 10.1016/j.apor.2017.03.013
M3 - Article
VL - 65
SP - 60
EP - 78
JO - Applied Ocean Research
JF - Applied Ocean Research
SN - 0141-1187
ER -