Modal Analysis of Offshore Monopile Wind Turbine: An Analytical Solution

被引：60

作者：

Pezeshki, Hadi ^{[1
]}

Pavlou, Dimitrios ^{[1
]}

Adeli, Hojjat ^{[2
]}

Siriwardane, Sudath C. ^{[1
]}

机构：

[1] Univ Stavanger, Kjolv Egelands hus,E Block,2nd Floor,Kristine Bonn, N-4021 Stavanger, Norway

[2] Ohio State Univ, Columbus, OH 43210 USA

来源：

JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING-TRANSACTIONS OF THE ASME | 2023年 / 145卷 / 01期

关键词：

offshore wind turbine; response; natural frequencies; natural modes; wave-structure interactions; nonlinear wave kinematics; soil-structure interactions; design of offshore structures; dynamics of structures; fluid-structure interaction; geotechnology and foundation engineering; ocean energy technology; structural mechanics and foundation; wave mechanics and wave effects; INDUCED SEABED RESPONSE; VIBRATION CONTROL; NATURAL FREQUENCY; CONTROL-OPTIMIZATION; PARALLEL ALGORITHMS; DYNAMIC-RESPONSE; OPTIMUM DESIGN; MODEL; FOUNDATION; PROTOTYPE;

D O I：

10.1115/1.4055402

中图分类号：

P75 [海洋工程];

学科分类号：

0814 ; 081505 ; 0824 ; 082401 ;

摘要：

An analytical solution of the dynamic response of offshore wind turbines under wave load with nonlinear Stokes's wave theory and wave-structure and soil-foundation interactions is developed. Natural frequencies and the corresponding modes are obtained. The effect of the wave-structure interaction, the added mass, the foundation stiffness, and the nacelle translational and rotational inertia on the motion of the structure is investigated. The nonlinear loading provided by the drag term of Morison's equation is successfully handled. A parametric study to examine the effect of the structural parameters on the dynamic response is conducted, and the results of the proposed analytical solution are compared to numerical ones. The proposed method has the following advantages: (a) it is accurate and straightforward because of its analytical nature, (b) it does not ignore the drag term in the wave loading by keeping its nonlinearity nature, (c) the structure of the wind turbine is modeled as a continuous system, (d) it takes into account the effect of the rotational and translational inertia of the nacelle on the dynamic response, and (e) it provides an interpretation of the effect of the sea level variation in changing the natural frequencies.

引用

页数：18

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