多阶梯被动变阻尼装置设计、试验及结构风振控制分析

针对粘滞阻尼器出力范围窄，磁流变等变阻尼装置需能量输入和反馈控制的局限性，在前期单阶梯被动变阻尼装置研制基础上，设计制作了一种多阶梯被动变阻尼耗能装置（Multi-stage Passive Variable Damping Device，MPVDD），该装置采用被动控制方式，在不同速度区间拥有不同的阻尼系数变化规律。对其进行了相关性能验证试验和基于该装置结构风振控制效果的数值计算，试验和分析表明：装置可根据外部激励速度变化，实时机械式改变阻尼系数，实现宽域值变阻尼力的输出，且不需外部能源供给和状态反馈；安装耗能装置高层结构风振下的加速度和位移响应均得到有效控制，保证了风载下结构的舒适性和安全性要求。所做研究为该装置的应用打下了良好的试验和理论基础。

DESIGN,PERFORMANCE TEST AND STRUCTURAL WIND VIBRATION CONTROL ANALYSIS OF MULTI-STAGE VARIABLE DAMPING DEVICE

In view of the narrow output range of viscous damper and the limitation of magnetorheological variable damping device requiring energy input and feedback control, based on the previous development of single-step passive variable damping device, a Multi-stage Passive Variable Damping Device (MPVDD) is designed and manufactured. MPVDD has different variable damping laws in different velocity ranges by passive control. Performance tests and the numerical analysis of wind-induced vibration control of MPVDD are carried out. The test and analysis show that the device can change the damping coefficient in real time according to the change of external excitation speed and realize the output of wide-range variable damping force without external energy supply and state feedback. The acceleration and displacement response of the high-rise structure under wind vibration can be effectively controlled to ensure the comfort and safety requirements of the structure under wind load. The results have laid an excellent experimental and theoretical foundation for the application of MPVDD.