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.