Study on the Structural Safety Evaluation of the Self-Elevating Offshore Wind Turbine Installation Unit

2021 ◽  
Author(s):  
Jiayi Hou ◽  
Yu Li ◽  
Haihua Zhang ◽  
Tiantian Kan
Keyword(s):  
Wind Turbine ◽  
Safety Evaluation ◽  
The Self ◽  
Offshore Wind ◽  
Structural Safety ◽  
Offshore Wind Turbine ◽  
Turbine Installation

Study on the Structural Safety Evaluation of the Self-Elevating Offshore Wind Turbine Installation Platform

2020 ◽  
Author(s):  
Hou Jiayi ◽  
Li Yu ◽  
Zhang Haihua ◽  
Kan Tiantian
Keyword(s):  
Wind Turbine ◽  
The Self ◽  
Offshore Wind ◽  
Structural Safety ◽  
Inertia Force ◽  
Offshore Wind Turbine ◽  
Environmental Load ◽  
Wave Load ◽  
Dynamic Amplification ◽  
Turbine Installation

Abstract In order to accurately evaluate the influencing factors of the structural safety of the self-elevating offshore wind turbine installation platform, the load in the standing operating state and towing state is studied in this paper, which includes self-gravity load, wind load, current load, wave load, wave-induced inertia force, dynamic amplification load and operating load. This paper focuses on two working states of the platform. In the standing state, the effect of environmental load, as well as the dynamic amplification load is considered under both normal operating condition and storm condition. In the towing state, mainly the wave environmental load is taking into consideration. According to the data calculated above, the strength calculation is carried out. The results show that the design strength of the platform meets the requirements. This calculation method can provide a basis for the design of the self-elevating platform.

scholarly journals Safety Evaluation of a Hybrid Substructure for Offshore Wind Turbine

2016 ◽  
Vol 2016 ◽  
pp. 1-14 ◽  
Author(s):  
Min-Su Park ◽  
Youn-Ju Jeong ◽  
Young-Jun You ◽  
Yoon-Koog Hwang
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Safety Evaluation ◽  
Offshore Wind ◽  
Structural Safety ◽  
Soil Conditions ◽  
Offshore Wind Turbine ◽  
Wave Forces ◽  
Stiffness Matrices ◽  
Reaction Forces

Towers and rotor-nacelles are being enlarged to respond to the need for higher gross generation of the wind turbines. However, the accompanying enlargement of the substructure supporting these larger offshore wind turbines makes it strongly influenced by the effect of wave forces. In the present study, the hybrid substructure is suggested to reduce the wave forces by composing a multicylinder having different radii near free surface and a gravity substructure at the bottom of the multicylinder. In addition, the reaction forces acting on the substructure due to the very large dead load of the offshore wind turbine require very firm foundations. This implies that the dynamic pile-soil interaction has to be fully considered. Therefore, ENSOFT Group V7.0 is used to calculate the stiffness matrices on the pile-soil interaction conditions. These matrices are then used together with the loads at TP (Transition Piece) obtained from GH-Bladed for the structural analysis of the hybrid substructure by ANSYS ASAS. The structural strength and deformation are evaluated to derive an ultimate structural safety of the hybrid substructure for various soil conditions and show that the first few natural frequencies of the substructure are heavily influenced by the wind turbine. Therefore, modal analysis is carried out through GH-Bladed to examine the resonance between the wind turbine and the hybrid substructure.

scholarly journals Impact of Typhoons on Floating Offshore Wind Turbines: A Case Study of Typhoon Mangkhut

2021 ◽  
Vol 9 (5) ◽  
pp. 543
Author(s):  
Jiawen Li ◽  
Jingyu Bian ◽  
Yuxiang Ma ◽  
Yichen Jiang
Keyword(s):  
Wind Turbine ◽  
Wind Turbines ◽  
Safety Evaluation ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Motion Response ◽  
Offshore Wind Turbines ◽  
Floating Offshore Wind Turbines ◽  
Coupling Motion

A typhoon is a restrictive factor in the development of floating wind power in China. However, the influences of multistage typhoon wind and waves on offshore wind turbines have not yet been studied. Based on Typhoon Mangkhut, in this study, the characteristics of the motion response and structural loads of an offshore wind turbine are investigated during the travel process. For this purpose, a framework is established and verified for investigating the typhoon-induced effects of offshore wind turbines, including a multistage typhoon wave field and a coupled dynamic model of offshore wind turbines. On this basis, the motion response and structural loads of different stages are calculated and analyzed systematically. The results show that the maximum response does not exactly correspond to the maximum wave or wind stage. Considering only the maximum wave height or wind speed may underestimate the motion response during the traveling process of the typhoon, which has problems in guiding the anti-typhoon design of offshore wind turbines. In addition, the coupling motion between the floating foundation and turbine should be considered in the safety evaluation of the floating offshore wind turbine under typhoon conditions.

scholarly journals Safety Evaluation of the Combined Load for Offshore Wind Turbine Suction Foundation Installed on Sandy Soil

2021 ◽  
Vol 33 (5) ◽  
pp. 195-202
Author(s):  
Jeong Seon Park
Keyword(s):  
Wind Turbine ◽  
Sandy Soil ◽  
Wind Waves ◽  
Safety Evaluation ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Element Analysis ◽  
Combined Load ◽  
Combined Loads ◽  
Moment Load

Offshore wind turbine (OWT) receive a combined vertical-horizontal- moment load by wind, waves, and the structure’s own weight. In this study, the bearing capacity for the combined load of the suction foundation of OWT installed on the sandy soil was calculated by finite element analysis. In addition, the stress state of the soil around the suction foundation was analyzed in detail under the condition that a combined load was applied. Based on the results of the analyses, new equations are proposed to calculate the horizontal and moment bearing capacities as well as to define the capacity envelopes under general combined loads.

Loading and Structural Analysis of the Self-Aligning HyStOH Floating Wind Turbine Concept

2019 ◽  
Author(s):  
Andreas Manjock ◽  
Markus S. Starr
Keyword(s):  
Structural Analysis ◽  
Wind Turbine ◽  
The Self ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Structure Representation ◽  
Flexible Support ◽  
Analysis Methodology ◽  
Elastic Load ◽  
Load Simulation

Abstract This paper summarizes the results of the implementation and verification of a hydro-aero-servo-elastic load simulation model for a self-aligning floating offshore wind turbine (FOWT) combined with a structural analysis methodology of this FOWT structure. The main focus is a comparison of a rigid and a flexible support structure representation in the load simulation. This investigation is part of the multiparty project for the ‘Hydrodynamic and Structural Optimization of a Semi-submersible Offshore Wind Turbine’ (HyStOH), joining partners from science and industry and financially supported by the German Ministry of Economics Affairs and Energy, BMWi (Bundesministerium für Wirtschaft und Energie).

scholarly journals Virtual Prototyping of a Low-Height Lifting System for Offshore Wind Turbine Installation

2021 ◽  
Author(s):  
Jiafeng Xu ◽  
Behfar Ataei ◽  
Karl Henning Halse ◽  
Hans Petter Hildre ◽  
Egil Tennfjord Mikalsen
Keyword(s):  
Wind Turbine ◽  
Virtual Prototyping ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Lifting System ◽  
Turbine Installation

Fuzzy Bayesian schedule risk network for offshore wind turbine installation

2019 ◽  
Vol 188 ◽  
pp. 106238 ◽  
Author(s):  
Min-Yuan Cheng ◽  
Yung-Fu Wu ◽  
Yu-Wei Wu ◽  
Sainabou Ndure
Keyword(s):  
Wind Turbine ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Schedule Risk ◽  
Turbine Installation

A Study on Static Water Resistance Prediction of Offshore Wind Turbine Installation Vessel

2014 ◽  
Vol 1061-1062 ◽  
pp. 1124-1128
Author(s):  
Lei Xin ◽  
Chang Han Ng ◽  
Song Lin Yang
Keyword(s):  
Mathematical Model ◽  
Wind Turbine ◽  
Water Resistance ◽  
Estimation Method ◽  
Engineering Application ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Static Water ◽  
Resistance Prediction ◽  
Turbine Installation

A mathematical model is proposed for predicting static water resistance of offshore wind turbine installation vessel and to calculate the resistance of a certain type of offshore wind turbine installation vessel. In order to verify the efficiency of this mathematical model, the comparison between results calculated by it and actual model test has been made. The conclusion indicates that the estimation method is reliable, and it can provide reference for resistance calculation of similar type vessels. Currently in China, there are no references for the effective prediction and calculation of the resistance for offshore wind turbine installation vessel. Therefore the proposed method has important value of engineering application in the areas of effective resistance estimation method of offshore wind turbine installation vessel, as well as the numerical calculation of ship hydrodynamics.

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