Device and method for measuring dynamic shape of heat-proof structure

Abstract

The invention discloses a dynamic shape measuring device and method for a heat-proof structure, and the device comprises a structured light module which specifically comprises a supporting holder, a first camera, a second camera, a first lens, a second lens, a first narrow-band filter, a second narrow-band filter, a motor system, and a laser. The first camera and the second camera are respectively arranged on two sides of the support holder, the motor system is located in the middle of the support holder, the motor system, the first camera and the second camera are in threaded connection with the support holder through screws, the first narrow-band filter is arranged at one end of the first lens, the other end of the first lens is in threaded connection with the first camera, and the second narrow-band filter is arranged at one end of the second lens. The other end of the second lens is in threaded connection with the second camera, and the laser is arranged above the motor system and fixedly connected with the motor system through a screw. And the control module is used for controlling the structured light module to carry out projection and image acquisition, storing the acquired image, and carrying out preprocessing and point cloud calculation on the stored image.

Description

technical field [0001] The invention relates to the technical field of hypersonic test measurement, in particular to a device and method for measuring the dynamic shape of a heat-resistant structure. Background technique [0002] During the in-orbit flight of a hypersonic vehicle, the structural shape will change to varying degrees under the action of aerodynamic force and aerodynamic heat. The dynamic change of the shape of the heat-resistant structure is an intuitive manifestation of the ablation characteristics of the heat-resistant material, which will significantly reduce the structural strength of the heat-resistant structure and change the aerodynamic load borne by the aircraft. [0003] At the beginning of the design of hypersonic aircraft, a large number of aerodynamic heating tests need to be carried out in the arc wind tunnel. The gas is heated by the arc heater and accelerated to hypersonic speed through the nozzle for assessment. By measuring the shape change of...

AI Technical Summary

Problems solved by technology

[0004] Because the high-temperature airflow scours the heat-resistant material at a high Mach number speed, the surface temperature of the heat-resistant material rapidly soars to thousands of degrees Celsius, and it is difficult to implement the contact-type hypersonic vehicle ablation shape measurement method

However, the non-contact optical measurement method based on binocular vision will be affected by harsh lighting conditions such as the high-brightness arc of the arc heater and the shock wave on the surface of the heat-resistant material. It is difficult for the binocular camera to collect clear ablation images, which can be used for Calculation of 3D point cloud has few feature points and large matching error, and the ablation shape obtained by 3D reconstruction is rough and the accuracy is poor

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