Rolling and Pitching of Modeling of Supporting Platform for Half-rotating Impeller Tidal Turbine

The half-rotating impeller tidal turbine (HRITT) is a new type of vertical axis turbine. The supporting platform is an important device to ensure the stable operation of the HRITT. The rolling and pitching of the platform have a great influence on the energy efficiency of the HRITT. Based on the frequency response method, the theoretical model of rolling and pitching of the supporting platform was established. The reliability of the model was verified by simulation. The results showed that the amplitude response operator (RAO) of rolling and pitching varies greatly with the wave direction angle. The theoretical calculation was basically consistent with the RAO peak value of the numerical simulation, which proved that the theoretical calculation was reliable. The HRITT could operate stably in the wave direction angle of 30° to 60°.