Study on the Measurement of Ship Model Wave Pattern By Video Image

• Main Authors: Jia-Neng Chen, 陳家能
• Other Authors: Jing-Fa Tsai
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/56808563437087737247

碩士 === 國立臺灣大學 === 造船及海洋工程學研究所 === 88 === The purpose of this study is to establish a measurement and analysis system of a 3-D data of wave patterns generated by a ship model. The results can be used for the computation of the wave resistance and to optimize the ship design. The approach to measure the wave patterns is to cast a thin light sheet onto the water surface. The image of wave pattern was photographed by a CCD camera. 2-D data of the surface profile along a line normal the sailing line is recorded in this photograph. The visibility of the wave surface is improved by scattering small particles onto the water. 3-D wave pattern can be reconstructed from the 2-D surface-profile time-history of the wave pattern as the ship model passed by the sheet light. The analysis software is developed by Borland C++ Builder 4.4 . Image processing techniques and algorithms were used to process original images and generate the wave heights. Then the 3-D wave patterns were displayed by perspective images and contour maps.