【摘要】 摩擦阻尼器结构简单、安装容易、性能稳定,具有广泛的应用领域。传统摩擦阻尼器,因阻尼力不具备调节能力,而只能对结构的振动产生有限的控制效果。压电材料和磁致伸缩材料分别具有在电场或磁场激励作用下的快速变形能力,是两类重要的智能材料。利用以上两类智能材料制成的驱动器,调节摩擦阻尼器摩擦面的正压力,进而达到调节摩擦力的目的,是实现摩擦阻尼器智能化的重要途径。利用三个形状基本相同,材质分别为Terfenol-D金属、树脂基磁致伸缩复合材料以及压电陶瓷制成的驱动器,与同一参数的摩擦阻尼器复合,制成了三个阻尼力可调的智能摩擦阻尼器,并完成了它们的阻尼力及响应时间测试。结果表明,利用Terfenol-D驱动器复合的阻尼器(GMM摩擦阻尼器)具有最大的绝对出力和可调范围,利用树脂基磁致伸缩驱动器复合的阻尼器(GMPC摩擦阻尼器)次之,利用压电陶瓷驱动器复合的阻尼器(PZT摩擦阻尼器)最弱。GMM阻尼器和PZT阻尼器的响应时间分别在60 m s-80 m s以及30 m s左右。更多还原

【Abstract】 Due to possessing character of simple structure,easy installation and steady performance,friction damper has been widely used in different areas.As its performance can not be changed during utilization,a traditional friction damper only has limited control effect on vibration of structures.Piezoelectric material and magnetostrictive material are two kinds of smart materials and possess ability of changing its length under excitation of electric or magnetic field respectively.Utilizing actuator made by above two smart materials to adjust normal force of a friction damper,then to change its friction force,is one of main methods to make friction damper be adjustable during application.Here,three smart friction dampers are made.All the dampers have same structural parameters and their damping force can be respectively adjusted with three actuators which are made by Terfenol-D metal,polymer-bonded Terfenol-D composites and piezoelectric ceramic.The damping force and the response time of the above dampers are tested.Experimental results show that,the friction damper made by Terfenol-D metal(GMM friction damper) possesses the largest adjustable force and adjustable ratio,the adjustable force and adjustable ratio of the friction damper made by polymer-bonded Terfenol-D composites(GMPC friction damper) are a little less than those of GMM friction damper,the friction damper made by piezoelectric(PZT friction damper) possesses the lowest adjustable force and adjustable ratio.Experimental results also show that,the response time of GMM damper and that of PZT damper are close to 60-80ms and 30ms,respectively.更多还原