液体一阶晃动模态的试验识别.pdf

International Journal of Fluid Dynamics 流体动力学, 2017, 5(4), 125-132 Published Online December 2017 in Hans. /journal/ijfd /10.12677/ijfd.2017.54014 Experimental Identification of the First Sloshing Mode of Liquid Pengxiang Wang, Yuchun Li Department of Hydraulic Engineering, College of Civil Engineering, Tongji University, Shanghai nd th th Received: Dec. 2 , 2017; accepted: Dec. 17 , 2017; published: Dec. 26 , 2017 Abstract The sloshing mode of liquid (natural frequency, mode shape and damping ratio) is the important parameter for the design of liquid-storage structure and the vibration control. In this paper, the artificial excitation is used to stimulate the first mode motion of the liquid free surface in contain- er. The decaying free sloshing in the first mode will occur on the liquid free surface after removing the excitation. The decay curves of free vibration of wave height on the several points of liquid surface can be simultaneously measured by the several laser displacement sensors. Thus, the first natural frequency, mode shape and damping ratio of liquid sloshing can be obtained. The experi- mental frequencies and mode shapes agree well with theoretical results. The present experimen- tal identification method is applicable to the arbitrary tanks. Keywords Liquid Sloshing, Modal Parameter, Experimental Identification 液体一阶晃动模态的试验识别 王鹏翔，李遇春 同济大学土木工程学院水利工程系，上海 收稿日期：2017年12月2 日；录用日期：2017年12月17 日；发布日期：2017年12月26 日 摘 要 液体的晃动模态( 自然频率、振型与阻尼比系数)是贮液结构设计以及振动控制的重要参数，本文采用人 文章引用: 王鹏翔, 李遇春. 液体一阶晃动模态的试验识别[J]. 流体动力学, 2017, 5(4): 125-132. DOI: 10.12677/ijfd.2017.54014 王鹏翔，李遇春 工激励的方法可容易激发出容器内液体自由表面的一阶模态运动，撤除激励后液体表面按一阶振型作自 由衰减振动，采用多个激光位移器测量液体表面多个点的波高自由衰减曲线，从而可得