Inspection System Of The Floating Body Of Six Degrees Of Freedom

Because 6D motion of a floating body is often investigated in engineering design and scientific research, the 6D motion should be accurately measured. One six degree of freedom (6-DOF) detection system was developed which was financially supported by the National Planning Committee for the development of State Key Laboratories. Verification test shows that the system is acceptable for measuring the 6D motion of a floating body.At first, the thesis presents the research situation, both domestic and overseas, and the feasibility and significance of the development of 6-DOF detection system. Then self-developed contacting 6-DOF detection system is described, the advantages of which are lighting, easy installation and operation, automatic data acquisition and processing with computer program. This kind of device can measure 6-DOF simultaneously, and had been applied in physical model test of coastal and offshore engineering, it can bo used to measure the motion status of ship or anchored floating body. In addition, the non-contacting 6-DOF detection system are described. Based on computer vision technique, this kind of device acquires the 2D coordinates of characteristic points through image processing. With the intersection measurement technique and solving linear equations, it reconstructs the 3D space coordinates and then calculates the 6-DOF of floating body. This non-contacting 6-DOF detection system consists of image processing and computer vision technique, and it has such advantages as real-time processing, high accuracy and integration of data acquisition, processing and analysis.At last, the experiment steps and the set-up of the parameters of the two analyzing methods for the non-contacting 6-DOF detection systems are described in this thesis. Also, the measurement results are analyzed by comparing their performance and all kinds of indices. The intersection measurement method is the better one and used in 3-D reconstruction for the non-contacting 6-DOF detection system developed in this thesis.