论文部分内容阅读
超声散斑相关法可应用于水下物体内层界面的位移测量,在工程建设中具有广泛的应用前景。根据所建立的测量实验系统,对位于水中的有机玻璃试件内层界面的面内位移和离面位移进行了实测,测量误差一般在7%以内。进一步研究结果表明:在刚体位移情况下,一般经粗磨、粗刨和粗铣加工或砂模铸造后的粗糙外层界面对超声散斑相关法内层界面位移测量结果的影响极小;当外层界面发生应变时,其变形前后内层界面上的散斑场的相关性将随应变量的增加而减弱,但外层界面应变小于0.05ε时,内层界面上超声散斑相关系数的减小不超过4%。
Ultrasonic speckle correlation method can be applied to the displacement measurement of the inner interface of underwater objects, which has a wide range of applications in engineering construction. According to the established measurement experiment system, the in-plane displacement and out-of-plane displacement of plexiglass specimen located in water were measured, and the measurement error was generally within 7%. The results of further studies show that the influence of ultrasonic speckle correlation method on the interface displacement measurement results is minimal when the rigid body is displaced. When the outer interface is under strain, the correlation of the speckle fields at the inner interface before and after the deformation decreases with the increase of the strain amount. However, when the outer interface strain is less than 0.05ε, the correlation coefficient of the speckle at the inner interface Reduce by no more than 4%.