Analysis of the Vibrational Properties of Wind Turbines Utilizing a Gravity Speed Regulating Mechanism

In order to investigate the vibration characteristics and optimize the design of the gravity return type wind turbine, this study analyzes the influence of the length of the tail rod on the vibration characteristics of the wind turbine in the yawing process using the wind tunnel test method. The test was carried out with a retractable tail rod structure at a high wind velocity of 10 m/s. The results indicate that with an increase in the yaw angle of the wind turbine, both the vibration frequency and the amplitude of vibration acceleration decrease; the first-order axial vibration frequency of the tower exceeds the radial vibration frequency for yaw angles ranging from 0 deg to 45 deg, whereas the converse holds for yaw angles between 45 deg and 60 deg. It is further found that when the length of the tail rod is 1.1 m, the first-order axial vibration frequency and amplitude of the tower are at a lower level, while the first-order radial vibration frequency and amplitude are reduced by a larger amount of 10.95% and 34.48%, respectively, which shows a better vibration reduction effect. This study offers both a theoretical foundation and experimental support for the structural design of gravity return type wind turbines, while also having a significant application for enhancing the operational stability of wind turbines.