Method for measuring strain of connecting piece of pull rod linkage mechanism

Abstract

The invention relates to a method for measuring the strain of the connecting piece of a pull rod linkage mechanism. The method captures a sensed image of a connection position by using double cameras, may measure the strain gradient of the curved connecting piece, and comprises a step 1 of establishing a non-contact measurement coordinate system; a step 2 of discretizing a curved structure to be measured in order to divide the curved structure to be measured into a plurality of area units, observing the area units by using the double cameras at two different points of sight in order to obtain the sensed images, and obtaining the 3D morphological information of the surface of an object by computing and analyzing the parallax of the area units in different sensed images; a step 3 of computing the spatial positions, in the measurement coordinate system, of measuring points in the curved surface to be measured; and a step 4 of performing subarea point-by-point fitting on a displacement field by using a fitting process to obtain full-field strain. The method for measuring the strain of the connecting piece of a pull rod linkage mechanism overcomes the defects of a conventional strain gage measurement method, shortens a development period, and reduces development cost.

Description

technical field [0001] The invention belongs to the technical field of structural strength analysis, and in particular relates to a method for measuring the strain of a connecting piece of a tie rod linkage mechanism. Background technique [0002] With the improvement of the flight performance of modern aircraft, the linkage mechanism of the high-lift accretion device is widely used, see figure 1 As shown, A, B, C, and D in the figure are the connection positions. Connecting parts with large gaps in the linkage mechanism under the action of large concentrated loads (see figure 2 As shown) a new measurement method is urgently needed for strength assessment and calculation, which has become an important content of structural strength analysis. [0003] Regarding the strain measurement method of the large gap structure of the linkage mechanism, the strain gauge method is mainly used at present, and the strain gauge measurement method has high requirements on the measurement ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for measuring the strain of the connecting part of the tie rod linkage mechanism, which can solve the problems of current measurement methods or inaccurate measurement, or limited to the space of the measurement part.

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