摘要
按照结构减振效果位移RMS等价的原则提出的简化模型,分析了MR阻尼器的动力性能。MR阻尼器的等效粘性阻尼系数随施加电压的升高、频率的降低、振幅的减小而提高。施加电压在0～5V时,等效粘性阻尼系数变化幅度较大;达到10V后逐渐趋向饱和。低频、小振幅区域在施加的电压不为零时等效粘性阻尼系数比较稳定,而施加的电压为零时等效粘性阻尼系数随着频率和振幅的升高迅速下降。MR阻尼器可调性主要集中在高频、大振幅区域。MR阻尼器的等效刚度系数约为等效阻尼系数的0.1倍。等效刚度系数随施加电压的降低、频率的增大、振幅的增大而提高。施加电压在0～5V时等效刚度系数变化幅度较大,达到10V后逐渐趋向稳定。
Based on equivalent root mean square (RMS) of structural deflection criteria, a simplified model is established for MR damper used in passive control. The mechanical performance of MR dampers is related to applied voltage, displacement amplitude and frequency. The equivalent viscous damping coefficient (EVDC) and the equivalent stiffiness coefficient (ESC) capture the salient features of MR dampers. EVDC has larger variation when applied voltage is in the range of 0 V to 5 V and it come to saturation with voltage reach 10 V. When MR damper applied voltage vibrates in the region of lower frequency and small amplitude, stable EVDC is obtatined. When voltage is equal to 0 V EVDC decreased rapidly with the increase of frequency and amplitude. The transformation of MR damper mainly concentrates on the region of higher frequency and larger amplitude. The size of ESC is about 0.1 time that of EVDC and the factors influence upon ESC is discussed.
出处
《防灾减灾工程学报》
CSCD
2004年第1期99-104,共6页
Journal of Disaster Prevention and Mitigation Engineering
