Prof. He Xiaoyuan's team at Southeast University's School of Civil Engineering recently achieved a significant breakthrough in real-time deformation measurement for super-large diameter carrier rocket payload fairings. Their research, titled 'Real-Time Measurement of Full-Circumference Deformation for Carrier Rocket Payload Fairings Based on Camera Network,' was published online in 'Science China: Technological Sciences' on October 19, 2021.
The fairing structure is a critical component of super-large diameter carrier rockets, and ground load tests are pivotal for analyzing payload capacity. Real-time measurement of full-circumference deformation faces challenges such as large-scale speckle field fabrication, unifying high-precision coordinates for multiple three-dimensional systems, and real-time measurement of fairing deformation during loading. The breakthrough addresses these challenges, enhancing our understanding of fairing structural behavior under various load conditions.
In response to the real-time deformation measurement needs for super-large diameter carrier rocket payload fairings, the team introduced an innovative multi-camera network approach. They developed a deformation measurement system with 24 cameras, addressing the challenge of creating a large-scale speckle field using a digital speckle transfer method. To measure local deformation in real-time, they designed a real-time three-dimensional deformation measurement software based on a parallel computing strategy. The system achieved real-time measurement of 70,000 points/s for three-dimensional displacement and surface strain. The results, including high-precision calculations of diffusion angles based on 360° full-circumference deformation measurement, demonstrated exceptional performance with static noise standard deviations below 0.01mm for displacement and below 50 microstrain for strain. This research holds crucial application value for the load test and analysis of rocket body structures.
The first author of this paper is Dr. Shao Xinxing, a young faculty member, with Professor He Xiaoyuan as the corresponding author. The research received support from the National Natural Science Foundation Key Project, the National Natural Science Foundation Major Research Instrumentation Project, and the Beijing Institute of Intensity Environment.
For more details, you can access the paper through the following link: http://engine.scichina.com/doi/10.1360/SST-2021-0273
Figure 1 The Diffusion Angle of Real-Time Deformation Measurement Site and Loading Position
