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Studies on Dynamic 3D Shape Measurement of the Gravity Waves in Fluid-shell Coupled System

Author: LiangChenJie
Tutor: LiuXiJun
School: Tianjin University
Course: Vibration and Control
Keywords: Shell liquid coupling system Shape Measurement Fourier Transform Profilometry Dynamic measurement of digital image processing Time history
CLC: TP391.41
Type: Master's thesis
Year: 2008
Downloads: 43
Quote: 0
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Abstract


Elastic fluid-shell coupled system when the shell wall by the exciting force , there will be a different form of the substantial gravity wave phenomenon . The purpose of this study is to achieve the dynamic measurement of the gravity wave three-dimensional morphology and surface time history . In view of the experimental subjects is the surface of the water, and the liquid surface deformation by a big margin , and accompanied by phenomena such as splash on experimental measurements as well as the requirements of the post-data processing . This article describes the overview of the development and application prospects of the three - dimensional shape measurement system theoretical analysis of the three-dimensional shape measurement method according to the characteristics of the experimental objects and dynamic measurement requirements , opted -based phase profilometry Fourier transform Profilometry (Fourier Transform Profilometry, FTP) and experimental measurements . Real-time acquisition of the design of the experimental system according to cross the optical axis of the optical principle , wherein the raster image is the fringe spacing continuously adjustable digital stripes gravity waves by the LCD projector is projected onto the surface, and using a high - speed image acquisition system for experimental images . Comparative analysis the late experimental analysis of the image process various image processing methods , choose the appropriate image processing method of the experimental image preprocessing , and analysis of the Fourier transform spectral leakage and aliasing contour method and picket fence effect causes and proposed elimination method . Spatial domain preprocessing of the experimental images , reduce the influence of noise and improve the quality of the streak image , and after the Fourier transform, the frequency domain filter , an inverse Fourier transform, the unwrapping process a series of calculations of the liquid obtained after surface height information , and ultimately achieve a substantial measurement of three-dimensional morphology of gravity waves . Continuous processing of multiple images within the cycle time history of substantial gravity wave surface at any point . This article has different shell experimental measurements of the liquid-solid coupled system , the surface of the rectangular shell circular casing and Long wash exciting force subject to certain frequencies , different form of gravity waves and the course of time points . This is a fluid-shell coupled system of free surface wave experiment testing a new attempt , and provide a wealth of experimental data for future theoretical research .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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