Large-view-field real-time deformation measurement system and method for spacecraft structure static test

Abstract

The invention relates to a large-view-field real-time deformation measurement system and method for a spacecraft structure static test, and belongs to the field of structure deformation measurement in a large spacecraft structure static load test. The system comprises a test piece module, a calibration module, a multi-camera networking vision measurement module and a self-adaptive view field adjustment module; a test supporting tool is used for fixing a test piece and providing a loading boundary for the test piece, and the self-adaptive view field adjustment module is used for adjusting the measurement view field and the measurement position of the multi-camera networking system to achieve global visual capture of all measured points of measured pieces of various sizes and shapes. According to the measurement method, a fixed calibration target calibration system and a mobile unmanned aerial vehicle suspended calibration ruler calibration system are combined to calibrate a multi-camera measurement system. And high-precision measurement of the multi-camera networking measurement system is realized by adopting a method of carrying out real-time synchronous calibration and correction on the camera group before the test and before each measurement in the test.

Description

technical field [0001] The invention belongs to the field of structural deformation measurement in static load tests of large-scale spacecraft structures, and relates to a large-field real-time deformation measurement system and method for static load tests of spacecraft structures. Background technique [0002] In the process of spacecraft development, in order to assess the static strength and static stiffness level of the structure, and verify the rationality of the structural design, materials and processes, it is usually necessary to carry out static tests on the load-bearing structure, and carry out corresponding load-bearing capacity, structural stability, Mechanical response measurements such as shape scale factors. The static test of the spacecraft structure refers to the static strength and static stiffness test carried out in the development stage of satellites, spacecraft, rockets, and upper stages. The structural deformation parameter is an important index to e...

AI Technical Summary

Problems solved by technology

For the measurement method of the contact displacement meter, it is usually accurate and reliable in the measurement of the local deformation of the structure, and it is also widely used in the deformation measurement of the current static test. However, due to the existence of the contact force, the contact measurement The measurement method cannot measure large deformation and deformation of soft structures. For large-scale static tests, there are many deformation measurement points and are widely distributed. It is necessary to build a large and complex displacement meter installation tooling system. The design and production costs of huge and complex tooling systems Large, complex system construction, time-consuming and labor-intensive installation, huge engineering volume, hidden dangers to personnel safety and product safety, and interference to the loading system and platform system of the static test. Contact deformation measurement is used in static test applications has certain limitations

For monocular or binocular conventional visual measurement, it is limited to a small field of view for a single measurement and poor real-time measurement. At the same time, due to the large and complex structure with many measuring points and wide distribution, conventional visual measurement has problems such as unreachable measurement and insufficient coverage of the field of view.

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