不同边界条件下吸力筒导管架式海上风电振动特性分析

  目的  吸力筒导管架是一种具备许多优点的新型海上风电基础，其振动特性与传统基础有着明显的不同。正确处理无限域地基的边界条件对准确分析振动问题至关重要，故对不同边界条件下吸力筒导管架式海上风电的振动特性进行分析。  方法  以某吸力筒导管架式海上风电为分析对象，在ANSYS APDL中建立结构与土体耦合的全三维有限元模型，研究边界条件对自振频率的影响并对相关参数进行敏感性分析。  结果  不同边界条件对整机固有频率影响较大，改变边界条件对结构轴向刚度和扭转刚度的影响大于对弯曲刚度的影响，整机固有频率随着粘弹性边界弹簧刚度、土体弹性模量和筒土摩擦系数的增大而增大。  结论  分析了影响整机固有频率计算精度的相关因素，可为工程计算提供参考。

Vibration Characteristics Analysis of Suction Bucket Jacket Offshore Wind Turbine in Different Boundary Conditions

  Introduction  The suction bucket jacket is a new type of offshore wind turbine foundation with many advantages， and its vibration characteristics are obviously different from those of traditional foundations. Correctly handling the boundary conditions of the infinite foundation is very important to accurately analyze the vibration problem， so this paper analyzes the vibration characteristics of the suction bucket jacket offshore wind turbine under different boundary conditions.  Method  Taking a suction bucket jacket offshore wind turbine as the analysis object， a full three-dimensional finite element model of structure and soil coupling was established in ANSYS APDL， the influence of boundary conditions on the natural frequency was studied， and the sensitivity analysis of related parameters was carried out.  Result  Different boundary conditions have a great influence on the natural frequency of the whole structure. Changing the boundary conditions has a greater influence on the axial stiffness and torsional stiffness than the bending stiffness of the structure. The natural frequency of the whole structure increases with the spring stiffness of the viscoelastic boundary， the elastic modulus of the soil， and the coefficients of friction between the bucket and soil.  Conclusion  The related factors that affect the calculation accuracy of the natural frequency of the whole structure are analyzed， which can provide references for engineering calculations.