A Recognition Method of Impact Damage Feature on Surface of Reusable Spacecraft

Abstract

The invention discloses a reusable spacecraft surface impact damage feature identification method. The temperature is divided into the row of the frame number; the temperature is divided into the column of the frame number where the temperature peak point is located; the transient thermal response is extracted in blocks and steps; the mean shift algorithm is used to automatically classify the extracted typical transient thermal response; A decomposition multi-objective optimization algorithm based on gradient search weight adjustment is used to select the representative of each type of transient thermal response to form a matrix Y; change the three-dimensional matrix into a two-dimensional matrix, and use the matrix Y to linearly change it to obtain a two-dimensional image matrix R (x, y); use the one-dimensional Ostu segmentation algorithm to perform feature extraction on the two-dimensional image matrix R(x, y). Through the uniformly distributed solution set, the present invention comprehensively considers the difference and similarity, and improves the accuracy of defect feature extraction.

Description

technical field [0001] The invention belongs to the technical field of spacecraft damage detection and evaluation, and more specifically, the invention relates to a method for identifying impact damage characteristics on the surface of a reusable spacecraft. Background technique [0002] For reusable space vehicles, in order to ensure that no serious aerodynamic thermal damage occurs when entering / re-entering the atmosphere, it is necessary to lay various heat-resistant materials on its surface to ensure the safety of the spacecraft. However, due to the high-speed impact of the fragments of the spacecraft's own coating, or the ultra-high-speed impact of space debris in the earth's orbit, physical damage to the heat-resistant material on its surface will be caused. Especially when a spacecraft is performing missions in a space debris environment, the probability of being hit by tiny space debris is very high. It is worth noting that ultra-high-speed impacts will directly cau...

AI Technical Summary

Problems solved by technology

However, when reassigning the weight vector, it is necessary to know the distribution of the real solution in advance, and assign different weight vectors according to the density of the solution set, and the adjustment of the weight vector will affect the distribution of the solution set in the space and the objective function Therefore, when adjusting the weight vector, if the adjustment is not enough, the algorithm will not achieve the expected effect, and the ideal uniformly distributed Pareto optimal solution set cannot be obtained; and too much adjustment may cause generation There is no solution in the solution set that can make the decomposed sub-problem tend to a stable minimum value, thus affecting the convergence of the algorithm

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