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Gravity center measuring method

A measurement method and center-of-gravity technology, applied in the field of measurement, can solve the problems of low measurement accuracy, difficulty in realization, and the scarcity of the first feature point, and achieve the effects of high measurement accuracy, reduced error, and easy measurement process

Active Publication Date: 2021-02-12
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The patent application discloses a centroid measurement method, but since the measurement requires multiple suspensions, and each suspension needs to measure a, b, c, d, a', b', c', d', A1 and B1 Waiting for the position of 10 points makes this technology have the problems of cumbersome process and difficult implementation (it is impossible to measure the covered measurement points with three coordinates or laser tracker)
[0004] The patent application discloses a method for measuring the center of mass of a special-shaped object, but due to "hooking holes are provided at different positions of the special-shaped object to be measured", the object to be measured needs to have "hooking holes"; Two first feature points", and obviously due to the scarcity of the first feature points, it is difficult to appear two first feature points on the grating at the same time, or it is difficult to accurately appear two first feature points on the grating at the same time, or it is difficult to accurately "Find the two first feature points on the corresponding 3D data"
These problems will lead to difficult measurement process or low measurement accuracy
[0005] The patent application discloses a method for measuring the center of mass of irregular objects, but because it is difficult to accurately obtain the exact positions of the suspension points A, B, and C, and the process of obtaining the intersection points A1, B1, and C1 is cumbersome and requires a lot of manual operations, there are The accuracy is not easy to guarantee and the laser level is difficult to adjust

Method used

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specific Embodiment approach

[0055]In order to clearly and completely describe the technical solution of the present invention and its specific working process, in conjunction with the accompanying drawings of the specification, the specific implementation of the present invention is as follows:

[0056]In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , Or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, it can be the internal communication of two components or the interaction relationship between two components, unless otherwise specified The limit. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057...

Embodiment 1

[0060]Refer tofigure 1 ,figure 2 ,image 3 withFigure 8, A center of gravity measurement method, including the following steps:

[0061]1) Obtain the 3D mathematical model of the object to be tested 1 through 3D profiler scanning, white light scanner scanning, laser tracker scanning, and direct use of the existing 3D digital model of the object to be measured (such as Catia zero, combined file), etc. (3D diagram, three-dimensional data);

[0062]2) Select or set on the object to be measured 1 (install on the object to be measured a logo that is rigidly connected to the object to be measured for easy measurement) as shown in the 8 reference points, it can be seen that at least 3 of the reference points are not In a straight line.

[0063]If the measurement mark is used as the reference point in step 2), in order to improve the measurement accuracy, the center of gravity of the mark can be calculated or measured separately, and then the force balance principle can be used to eliminate the influ...

Embodiment 2

[0089]Refer toFigure 4 ,Figure 5 ,Figure 6 ,Figure 7 withFigure 8, A center of gravity measurement method, including the following steps:

[0090]1) Obtain the 3D mathematics of the object to be measured 2 through 3D profiler scanning, white light scanner scanning, laser tracker scanning, direct use of the existing 3D digital model of the object to be measured 2 (such as Catia zero, combined file), etc. Model (3D diagram, three-dimensional data);

[0091]2) Select or set 2 on the object to be measured 2 (install on the object to be measured 2 a mark that is rigidly connected to the object to be measured for easy measurement) 5 reference points, it can be seen that at least 3 points are not in a straight line .

[0092]3) Accurately measure the coordinates of the reference point in the 3D mathematical model of the object 2 in step 2) by means of three-coordinates, laser tracker, etc.

[0093]4) Hang the measured object with a suspension wire (hang it with hooks, bindings, etc.) to make the measu...

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Abstract

The invention discloses a gravity center measuring method, and belongs to the technical field of measurement. The measuring method comprises the steps: obtaining a 3D digital model of a to-be-measuredobject by utilizing a principle of measuring a gravity center by a suspension method; suspending the to-be-measured object for multiple times by using a suspension line; measuring the position of thevertical line relative to the object during each suspension to obtain an equation of the vertical line relative to the to-be-measured object; and solving an intersection point of the plurality of vertical line equations, wherein the obtained intersection point is the gravity center of the to-be-measured object. According to the measuring method, errors are reduced through multiple times of measurement, so that the measurement precision is high; a plurality of datum points can be arranged on the to-be-measured object, but the measurement can be completed by using at least three datum points atone time in the measurement process, so that the measurement process is easy to realize; no requirement on the to-be-measured object and the suspension mode exists. The method has the advantages of high measurement precision, easy realization of the measurement process, and no special requirements on the to-be-measured object and the suspension mode.

Description

Technical field[0001]The invention belongs to the technical field of measurement, and specifically relates to a method for measuring a center of gravity.Background technique[0002]The engineering technology field often needs to accurately measure the center of gravity of an object (in addition, when the gravity field is uniform, the center of gravity and the center of mass coincide), and the suspension method is one of the center of gravity measurement methods, but the suspension method in the traditional sense is more suitable for thin plates The measurement of the center of gravity of an object, and the existing methods of measuring the center of gravity of an irregular object using the principle of the suspension method, have one or another defect.[0003]The patent application discloses a centroid measurement method, but because the measurement requires multiple hangings, and each hanging needs to measure a, b, c, d, a', b', c', d', A1 and B1 Waiting for the positions of 10 points ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M1/12
CPCG01M1/122
Inventor 李永强赵卯郭鑫曹玉文孙冠男左伟民孙小海邓忠涛杨飚吴佩玲
Owner CHINA FIRST AUTOMOBILE