基于新型TMD的水电站厂房结构振动控制研究

机组振动通常引起水电站厂房结构高阶模态共振，威胁水电站安全。针对水电站厂房结构较高阶模态振动问题，提出了基于调谐质量阻尼器（TMD）的振动控制方法，并设计了一种新型高频TMD控制器，开展了2层钢框架减振试验，研究其在高频简谐激励和窄带扫频激励下的减振效果。结果表明：新型TMD控制器能有效控制结构较高阶模态，其中附加TMD-3作用下的振动控制效果最好，结构顶层峰值加速度衰减率达到94.12%，一层峰值加速度衰减率达到95.55%；当TMD调谐频率偏离结构较高阶模态时，减振效果逐渐减小，但仍呈现出较好的减振效果，说明新型TMD调谐频率更宽，具有一定鲁棒性；当激励频率变宽时，随着调谐频率接近受控频率，减振效果最佳，但偏离受控频率时，鲁棒性变差。

Novel methodology of structural vibration control for hydropower house based on tuned mass damper

The vibration of power generating units usually causes resonances in high-order modes of the powerhouse structure of a hydropower station and threatens its safety. Aiming at this issue, a vibration control method based on the tuned mass damper (TMD) is presented. A new type of high-frequency TMD controller is designed, and tests are conducted on the vibration reduction of a two-story steel frame, focusing on the damping effect under high-frequency harmonic excitation and narrow-band sweep excitation. The results show that this controller effectively controls the high order modes of the structure and its control effect is best when TMD-3 is added, achieving an attenuation rate of peak acceleration of 94.1% at the top of the structure, and 95.6% in the first layer. As the TMD tuning frequency is lowered from the high-order modes, the damping is decreased gradually, but its effect remains satisfactory. This indicates that the new TMD tuning frequency band is wider and has a certain robustness. For wider excitation frequencies, the damping effect is the best when the tuning frequency is close to the controlled frequency, but the robustness worsens when it deviates from the controlled frequency.