Xieyongzhi
ABSTRACT
The nonlinear characteristics and the influence factors of the floating wind turbine are studied under the condition of strong coupling between the environmental load, the load and the response of system and the multi degree of freedom. The aerodynamic load of the floating wind turbine is calculated by using the blade element and momentum theory, The five wave theory and Morision equation are used to calculate the wave load, so the nonlinear dynamic model of the floating wind turbine is established. The Poincare cross section is calculated, and the dynamic response of the three degrees of freedom of system under the action of the environment load is analyzed. The influence of the wave excitation frequency on the nonlinear characteristics of the system is analyzed by using the Lyapunov exponent and the bifurcation diagram. The study shows that the amplitude of the longitudinal swing is large, the amplitude of the longitudinal wave is small, and the wave excitation frequency has a significant effect on the motion of the system. When the wave excitation frequency is near 1.4, the system is in a chaotic state, the wave excitation frequency is 0.8, and the system is in the state of the class period.
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Index Terms
- Analysis of nonlinear vibration characteristics of floating wind turbine
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