Digital Image Measuring Method of Hull Motion State in Bridge Crash Test

Abstract

The invention relates to a ship motion state digital image measuring method in a bridge collision test. According to the method, at first, an integral space rectangular coordinate system, a camera rectangular coordinate system and a rectangular coordinate system on a camera shooting plane are respectively set up, secondly, relation among the rectangular coordinate systems is set up, and A, B, C and D point coordinates of the shooting range ABCD and the coordinate of any point P of a camera on the plane are calculated; thirdly, feature points are selected from the area ABCD, pixel positions of all the feature points in an image are identified in the image, and linear systems of equations are set up and solved to obtain the mapping relation between the image and real space; finally, displacement of a ship body in the plane can be determined according to the mapping relation by identifying the feature points on the ship body. As a non-contact mode is adopted, the method is high in measurement precision, and the effect is more remarkable for large-scale test measurement in particular.

Description

technical field [0001] The invention relates to a motion state test method, in particular to a digital image measurement method for the motion state of a ship in a bridge collision test. Background technique [0002] With the rapid development of urban construction, the construction of large-scale viaducts has also increased year by year, and ship collision accidents caused by bridges have also occurred frequently. A puzzle for engineers. The core of anti-ship collision problem is navigation safety, because the consequences of ship collision with bridges are not only bridge damage and traffic interruption, but also ship damage, environmental pollution and casualties, and the consequences are very serious. [0003] Scholars at home and abroad have carried out a large number of theoretical and experimental studies on ship collision bridges, and have also designed many anti-collision devices, and some of them are also used in actual bridge engineering. However, in the researc...

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Problems solved by technology

However, in the research process of the anti-collision test, it is extremely important to study the impact direction, impact speed, and the changes of the ship's running track, running speed, rotational angular velocity, angular acceleration and other parameters after the impact, but in the test, especially Especially in the 1:1 model test, due to the large size of the hull used in the test, it is difficult to accurately measure the changes in physical quantities such as its running track and speed, which makes it difficult to guarantee the accuracy of the bridge collision test

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