External floating top vertical metal can volume measuring method based on three-dimensional laser scanning technology

Abstract

The invention discloses an external floating top vertical metal can volume measuring method. According to the method, firstly, complete three-dimensional point cloud data are obtained through adopting a multi-station scanning and splicing mode at the upper and lower parts of a floating disc; and then, the integral thought is utilized, the can wall point cloud data are cut and are divided into a plurality of small cylinders, and the volumes of the small cylinders are calculated and are superimposed for obtaining the total volume. Through fitting the point cloud coordinate data of each small cylinder at the height parts, the girth sheet radius is obtained, and further, the area of the bottom of the cylinder is calculated; the cylinder volume is calculated according to the obtained height; and meanwhile, the temperature and gradient correction is introduced. The bottom volume calculation adopts an equal-area circle dividing mode, the volume of each round table body and each middle cone is calculated, and the obtained total displacement is superimposed. The method has the advantages that the operation is simple, the safety is high, the work intensity is low, the fast measurement of large-sized external floating top vertical metal cans can be realized, the data processing is convenient, the accuracy is high, meanwhile, the metrological verification cost is greatly reduced, and certain economic benefits are brought.

Description

technical field [0001] The invention relates to the field of large-scale petroleum storage and transportation capacity measurement, and is mainly aimed at the volume measurement of large-scale external floating-roof vertical metal tanks. Background technique [0002] As an important strategic material, oil is closely related to the national economy and people's livelihood of the country. It is not only related to the country's political security and economic lifeline, but also penetrates into all aspects of daily life. As the world's demand for oil increases, the establishment of strategic oil reserves is becoming more and more important. my country's National Petroleum Reserve Center was established in 2007. It planned the construction of the third phase of the oil storage base. The first phase of the oil storage project used vertical metal tanks, which have been fully put into use. [0003] As a kind of vertical metal tank, the vertical metal tank with outer floating roof...

AI Technical Summary

Problems solved by technology

However, due to the limited number of measurement points, the geometric information of the tank wall cannot be fully reflected. If there are noise points and rough points, the measurement results will be greatly affected.

For the measurement of the bottom of the tank, the geometric measurement method is generally used to divide the equal area of ​​the tank bottom into several circles, use the level and the elevation ruler to measure the height of several points on each circle, and calculate the average value as the height of the plane where the circle is located ; Two adjacent circles form a circular frustum, and the total displacement is calculated by calculating the volume of the circular frustum and superimposing it. The disadvantage of this measurement method is that the number of measurement points is limited, the information of the tank bottom cannot be fully described, and there are labor-intensive, time-consuming and labor-intensive problems. shortcoming

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