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Hydroelastic Analysis of the Floating Structure for the Very Large Offshore Wind Farm

Author: HuangGuoYan
Tutor: ZhaoYao
School: Huazhong University of Science and Technology
Course: Design and manufacture of ships and marine structures
Keywords: Dimensional hydroelastic simplify method Object surface boundary conditions Vertical bending Offshore Large wind farms platform
CLC: P75
Type: Master's thesis
Year: 2011
Downloads: 51
Quote: 0
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Abstract

The 21st century is the era of human development of marine energy, offshore wind is numerous energy development and utilization of clean resources. Now, the vast majority of offshore wind structure type are offshore pile foundation, in the face of the accelerated speed of development of offshore wind energy, the future development of the the large distant sea floating wind farm is an inevitable trend. Bound to make wind power technology in the process of development by the shallow water to the deep-sea major technical changes, the most basic is the need of the wind turbine equipped with a platform for the re-design. Sea large wind farms floating platform is a very large floating structures (VLFS), it is necessary to consider the elastic deformation of the platform in the waves (ie, fluid-structure interaction), and therefore hydroelastic theory developed in nearly five decades. solving. Currently, the hydroelastic research is divided into the direct calculation method and modal analysis. In this paper, a modal analysis method, the floating body structures to simplify beams to calculate the dry air modal solving the hydrodynamic potential flow theory. According to the three-dimensional of water elasticity theory and three-dimensional rigid body potential flow theory distinction, different boundary conditions of the object surface, and then by changing the boundary conditions of the object surface, the degradation of three-dimensional water elasticity theory for three-dimensional rigid body theory. This simplified method is able to quickly and efficiently solving water elastic response of the structure in waves. This article focuses on the practicality of this simplified method in the engineering of large floating structure platform. First, the theoretical knowledge of structural dynamics, and state to find a suitable and fast method for solving the structure of dry mold. Seen by many research achievements for the large-scale structure of the beam can be simple beam analytical method for solving the structural characteristics. Second, the more mature of the three-dimensional rigid potential flow method, as well as to consider the structure of the elastic effect three-dimensional linear hydroelastic theory methods were discussed in detail, from the main difference between the two calculation methods is that water elasticity theory to consider generalized fluid-solid coupling boundary conditions. By changing the boundary conditions of the object surface modification of the equation, and the response to the movement, the three-dimensional water degradation of elastic theory for three-dimensional rigid potential flow theory. On this basis, the main coordinate motion response is obtained, the use the rigid displacement amplitude indicates that the structure of the various order elastic modal amplitude. Through an example, the calculation of the results of the calculation results of the method used herein with other relevant research and comparative analysis of the two results are consistent trend, which verifies the feasibility of this simplified analysis method for solving large floating structures hydroelastic sex. Again, given the type of platform concept design of offshore wind farms, analyze its water theory calculations of elastic and rigid body. Rigid body motion calculated response transfer function; vertical bending mode amplitude of the response of the structure, and the overall structure of the amplitude of the vertical displacement along the axial distribution of moment distribution. By to discuss the moment maps drawn by the three-dimensional rigid body with water elastic theory to prove hydroelastic theory considering the elastic deformation of the structure, the calculation results to better meet the requirements of the actual situation of the project. Finally, load values ??obtained by the two waves outside the load calculation methods applied to the structural similarities and differences of static analysis, compare the vertical displacement, axial stress, such as groping 3D rigid body method proposed in this paper three-dimensional hydroelastic simplify calculation results point.

Hydroelastic Analysis of the Floating Structure for the Very Large Offshore Wind Farm

Abstract

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