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Simulation of large-amplitude motion of floating wind turbines using conservation of momentum

机译：基于动量守恒的浮式风力发电机大振幅运动仿真

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摘要

A new method is presented to directly derive the nonlinear equations of motion (EOMs) of a floating wind turbine system using the theorem of conservation of angular momentum and Newton's second law. The methodology considers the system as two rigid bodies: the tower and the rotor-nacelle assembly (RNA). The large-amplitude rotation of the tower is described by the 1-2-3 sequence Euler angles, which offer accurate nonlinear coupling between motions in 6 degrees of freedom (DOFs). Two additional DOFs of the RNA relative to the tower, nacelle yaw and rotor spin, are prescribed by mechanical control and are also included in the EOMs of the entire system. Results from the EOMs are transformed among different coordinate systems at every time-step for use in the computation of hydrodynamics, aerodynamics and restoring forces, which preserves the nonlinearity between external excitation and structural dynamics. The new method is verified by critical comparison of simulation results with those of the popular wind turbine dynamics software FAST. The concept of highly compliant floating wind turbines is introduced. The large-amplitude motions and gyroscopic moments of one of these smaller, lighter structures is simulated in an example.
机译：提出了一种新的方法，利用角动量守恒定理和牛顿第二定律直接推导浮动风力涡轮机系统的非线性运动方程。该方法论将系统视为两个刚体：塔架和旋翼机舱组件（RNA）。塔的大幅度旋转由1-2-3序列Euler角描述，该序列在6个自由度（DOF）中的运动之间提供了精确的非线性耦合。相对于塔架的RNA的另外两个自由度，即机舱偏航和转子旋转，是由机械控制规定的，并且也包含在整个系统的EOM中。 EOM的结果在每个时间步长上都在不同的坐标系之间转换，以用于流体力学，空气动力学和恢复力的计算，从而保留了外部激励和结构动力学之间的非线性。通过将仿真结果与流行的风力发电机动力学软件FAST进行严格比较，验证了该新方法。介绍了高度兼容的浮动式风力涡轮机的概念。在一个示例中，模拟了这些较小，较轻的结构之一的大振幅运动和陀螺矩。

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