Experimental simulation on vortex-induced vibration of the WTT during the self-supporting state under construction

With the growth of mankind's demand for green energy, it is frequently reported that the vortex-induced vibration of the wind turbine tower (WTT) may occur under the self-supporting state during construction. In order to ensure the normal construction and structural safety of the wind turbine, it is necessary to study the vortex-induced vibration (VIV) of the turbine tower under the self-supporting state. Most of theoretical studies on VIV of the column are built based on numerical simulation results or displacement identification of wind tunnel tests, which leads to the existing theories cannot accurately predict the VIV characteristics. In order to accurately predict the VIV characteristics of the WTT under the self-supporting state, the spring suspended sectional model and the force and vibration synchronous measurement with built-in balances were employed in experimental simulation of the WTT's VIV. The results indicate that Reynolds number effect can be effectively corrected by increasing the surface roughness. The vibration measurement method with a sectional model successfully simulates the WTT's VIV, and the built-in balance technique successfully identifies the nonlinear vortex-induced force. The vortex-induced force calculated based on the existing empirical models are deviate greatly from the experimental test results, which indicate the empirical modes may overestimate or underestimate the VIV response. Increasing damping can effectively suppress the WTT's VIV, and the amplitude varies almost linearly with the damping ratio.