A Research On The Wind And Wave Loading And Influencing Factors Of The Monopile Tower Of Offshore Wind Turbine

The installed capacity of offshore wind turbine where location offshore gets bigger and bigger in recent years, it is a very important consideration in wind turbine design for accurately analyze under random wind and wave load, and that the tower of offshore wind turbine mainly adopt monopile structure, at the bottom has a large proportion contact with soil, pile-soil interaction make a big difference for the entire wind turbine dynamic characteristic, it is quite important to study interaction for structural design and stability of offshore wind turbine.This article rely on projects of National Natural Science Foundation "aeroelasticity stability analysis of wind turbine base on rigid-flexible multibody system model", based on the domestic and foreign scholars research result, the paper discussed the monopile tower dynamic response and characteristic of offshore wind turbine under random wind、wave and nonlinearrestriction soil, the specific tasks contain:1. Start from the mechanical principle of offshore wind turbine monopile tower with soil, combine with actual geologic information, established the tower pile-soil interreaction model after select appropriate p-y curve, the nonlinear distribution spring is introduced to simulate the interaction of pile and soil, the pile-soil interaction and soil properties influence for dynamic response and characteristic of offshore wind turbine is analyzed.2. Take a detailed analysis and deduction for differently wave theory existing, identify the method of describe random wave through environment parameters of the tower position. Then discuss the relevant parameter selection of wave load.3. Analysis aerodynamic load of offshore wind turbine impeller and tower, offered respective solution methods, atmosphere circumferential motion problem of the tower is studyed, explorered the selection issue of aerodynamic coefficient at tower working.4. Construction finite element structural dynamics equation on the basis of had been obtain wave、wind and soil load of tower, uses P-M and JONS WAP wave spectrum model calculation tower’s dynamic response under the action of wave、wind and soil load respectively, analysis the diversity of tower between soil load and without soil load, inspected the effect on the tower modal and dynamical response with variation soil parameters by finite element software, the results show that the influence on offshore wind turbine of the nonlinear properties of soil distortional should not be neglect.This paper use finite element numerical method analysis the structural dynamics of offshore wind turbine tower, because of soil load and wind、wave load couple effects are consider, so the load simulation of offshore wind turbine be more realistic, the influence on the monopile tower of natural frequency are investigated with soil affections, it provides the theoretical basis for prevention resonance、design reasonable burried depth and specific structure shape.