龙洗三维液体表面重力波的动态测量  

Dynamic measurement of the 3D shape gravity waves in dragon washbasin

作　　者：刘习军[1] 梁臣杰[1] 郭季平[1] 贾启芬[1] 滕小军[1] 刘龙霞[1] 

机构地区：[1]天津大学机械工程学院力学系,天津300072

出　　处：《振动与冲击》2009年第6期168-170,178,共4页Journal of Vibration and Shock

基　　金：国家自然科学基金资助(10572101);;863项目资助(2007AA04Z209)

摘　　要：在龙洗的强迫振动实验中,当龙洗壳壁受到一定频率激振力作用时,液面出现不同形态的大幅重力波现象。由于重力波液面变形幅度较大、水花飞溅,为了满足测试要求,根据交叉光轴的光学原理设计了实验测试系统,采用数字条纹光栅投影图像,利用高速图像采集系统连续采集。并进行中值滤波、傅里叶变换、频域滤波、傅里叶反变换等处理,最终可得到第一阶及第二阶大幅重力波任意时刻的三维形貌及大幅重力波任意点的时间历程。这是对壳液耦合系统中自由表面波进行实验测试的新尝试,为今后的理论研究提供了可靠的实验数据。The forced vibration test of the dragon washbasin was carried out. When a certain frequency exciting force is applied on the shell of the dragon washbasin, gravity waves with different shapes will appear. In view of the large magnitude of the water waves, and the water splash, more special consideration shoule be paid to the measurement. According to the crossed optical axis theory the experiment system was designed. The slits in the raster was made adjustable, and high speed camera was used for taking pictures. By using median filter, Fourier transformation, frequency filter, inverse Fourier transform etc, the 3D height information of the first-order and second-order gravity waves at any time was achieved. Processing a series of pictures in one period the time histories were gained at any point of the waves. The work is a new trial to measure free surface wave in fluid-shell coupled system, and the experimental results are of significant references for further theoretical study.

关 键 词：壳液耦合 三维形貌测量 重力波 数字图像处理 

分 类 号：O353.4[理学—流体力学]