空气阻尼式TMD在人致振动控制中的应用

Application of Air Damping Type TMD in Human-induced Vibration Control

用空气阻尼取代传统调谐质量阻尼器中的油阻尼形成的空气阻尼式TMD是一种新型减振装置。以控制人致振动为目标,建立人行荷载-简支梁人行桥-空气阻尼式TMD系统运动方程。由于空气阻尼的特殊性,在计算模型中引入Maxwell模型,分析空气阻尼TMD对人行荷载作用下简支梁桥振动控制效果。研究表明,空气阻尼式TMD具有比传统TMD更好的减振效果,当外荷载频率比偏离时,空气阻尼式TMD的减振效果降低,但仍保持在较高的水平,说明其具有较好的控制鲁棒性。

The air damping TMD is a new type vibration absorber,which is formed by substituting air damper for oil damper in traditional tuned mass dampers.To control human-induced vibration,the kinetic equation of human-induced load–footbridge of simply supported beam-air damping TMD hybrid system is established.Due to the special property of the air damping,Maxwell model is introduced into the calculation model.The effect of air damping TMD on vibration control of the simply supported beam bridge under pedestrian load is analyzed.The results show that the air damping TMD has a better damping effect than the traditional TMD.When the external load frequency ratio deviates from the optimal one,the damping effect of the air damping TMD decreases,but still remains at a high level,which shows that the damper has good vibration control robustness.