CN-116187072-B - Method for determining damage threshold of thermal control multilayer

CN116187072BCN 116187072 BCN116187072 BCN 116187072BCN-116187072-B

Abstract

The invention discloses a method for determining a damage threshold of a thermal control multilayer. The method comprises the following steps of determining a thermal control multi-layer target damage image and a target surface external heat flow power density distribution map, dividing the thermal control multi-layer target damage image and the target surface external heat flow power density distribution map into N 2 grid units according to the same scale of an N multiplied by N grid so as to obtain the full target surface of the thermal control multi-layer target, wherein the thermal control multi-layer target damage image is a damage shape front image of the thermal control multi-layer after a test and is used for judging the damage state in the grid units, and the target surface external heat flow power density distribution map is a power density distribution map irradiated on the surface of the thermal control multi-layer target during the test and is used for calculating the average power density in the grid units. The damaged state of each grid unit is judged, and the damaged state comprises damaged and undamaged states. An average power density corresponding to each grid cell is calculated. And determining the damage probability corresponding to the different average power densities respectively, and correspondingly, determining the threshold power density of the thermal control multi-layer under the different damage probabilities.

Inventors

HE MINBO
LIU SIQI
REN WEIYAN
WU ZHIHUA
YANG YUCHUAN
DING YAFEI
Fu Huailong
HU YUEHONG
HUANG LUMING
XU TIANHENG

Assignees

中国人民解放军32027部队

Dates

Publication Date: 20260512
Application Date: 20230303

Claims (6)

1. A method for determining a damage threshold of a thermally controlled multilayer, comprising the steps of: determining a thermal control multi-layer target damage image and an off-target heat flow power density distribution diagram, and performing the thermal control multi-layer target damage image and the off-target heat flow power density distribution diagram according to The grids are subjected to full target surface division with the same scale to obtain The thermal control multi-layer target damage image is a front image of the damage morphology of the thermal control multi-layer after the test and is used for judging the damage state in the grid unit, the target surface external heat flow power density distribution map is a power density distribution map irradiated on the surface of the thermal control multi-layer target during the test and is used for calculating the average power density in the grid unit, and the external heat flow power density distribution map is a two-dimensional matrix power density distribution map corresponding to the thermal control multi-layer target damage image; Judging the damage state of each grid unit, wherein the damage state comprises damaged and undamaged; calculating the average power density corresponding to each grid unit; Determining the damage probability corresponding to the average power density comprises the following steps: counting the thermal control multi-layer damage state and the average power density on each grid unit to obtain the ratio of the number of the damaged units to the total number of the units under different power densities, namely the damage probability; Wherein, the counting of the thermal control multi-layer damage state and the average power density on each grid unit obtains the ratio of the number of the damage units to the total unit number under different power densities, namely the damage probability, comprising: Obtaining from the average power density and the damage state of each grid unit Pairs of data points; Obtaining the total number of units and the number of damaged units in the intervals with different power densities based on interval statistics; Determining the damage probability corresponding to different average power density intervals according to the ratio of the number of damaged units to the total number of units; correspondingly, determining the threshold power density of the thermal control multilayer under different damage probabilities.
2. The method of claim 1, wherein the format of the thermally controlled multi-layered target lesion image comprises any one of jpeg format, bmp format, or png format.
3. The method of claim 1, wherein N is an integer greater than or equal to 10.
4. The method of claim 1, wherein determining the destruction threshold of each of the grid cells comprises: and judging the damage state of each grid unit by using an observation method.
5. The method of claim 1, wherein determining the destruction threshold of each of the grid cells comprises: Generating a binary image based on the thermal control multi-layer target damage image, wherein the pixel values of the binary image are 0 and 1 respectively, wherein 1 represents damage, and 0 represents non-damage; The binarization image and the external heat flow power density distribution diagram are subjected to the same grid division; When judging the damage state of the grid cell, counting the sum of the binarized image pixel values in the grid cell area, judging that the grid cell is damaged when the sum exceeds half of the total number of the image pixels in one grid area, and marking the grid state as 1, otherwise marking the grid state as 0.
6. The method of claim 1, wherein calculating the average power density for each of the grid cells comprises: cutting the out-of-target heat flow power density distribution graph into pieces according to gridding Opening a sub-picture; and counting the average value of pixel values in each sub-picture as the average power density corresponding to the grid unit.

Description

Method for determining damage threshold of thermal control multilayer Technical Field The application relates to the technical field of irradiation effect, in particular to a thermal control multilayer damage threshold determination method. Background The space spacecraft mainly depends on a thermal control system to ensure that the internal temperature of the satellite meets the working requirements. The heat control multilayer is formed by alternately overlapping a reflecting screen with low emissivity and a spacer with low heat conductivity, and the heat control multilayer utilizes layer-by-layer reflection of a screen to form high heat resistance to radiant heat flow, has excellent heat insulation performance under vacuum condition and becomes one of the most basic heat control means of the space spacecraft. As an exposed part of the space spacecraft, the thermal control multilayer has a large area, is easily influenced by external heat flow and the like, and can be damaged or even destroyed when serious, so that the heat insulation and temperature control capability of the thermal control multilayer is greatly influenced, and the temperature regulation function of the space spacecraft can be reduced or even lost. In order to improve the protection capability of the thermal control multilayer of the space spacecraft, the primary key problem is to figure out the damage threshold value of the thermal control multilayer under the irradiation action of different external heat flows. The definition of the damage threshold is generally two, namely, the definition of the traditional measurement by a lifting method, that is, taking the average value of the maximum energy density value without damage and the minimum energy density value with damage as the damage threshold, which corresponds to 50% of damage probability, and the definition of the energy density value with zero damage probability as the damage threshold. Based on any definition mode, a large amount of equivalent experimental research must be carried out on the ground, but the damage threshold value is difficult to accurately give due to the practical problems of radiation external heat flow difference, high test cost, insufficient data sample size and the like. Therefore, a method for determining the damage threshold of the thermal control multilayer under the irradiation of external heat flow needs to be researched, the defect that test data cannot be fully utilized due to the difference of the external heat flow is avoided, the damage threshold of the thermal control multilayer can be estimated and given through a small amount of tests, and a foundation is laid for the protection research of the thermal control multilayer of the space spacecraft. Disclosure of Invention The invention aims to provide a method for determining the damage threshold of a thermal control multilayer, which is used for effectively avoiding the defect that test data cannot be fully utilized due to the difference of external heat flow of irradiation, and the damage threshold of the thermal control multilayer can be estimated and given through a small amount of tests. The application provides a method for determining a damage threshold value of a thermal control multilayer, which comprises the following steps of determining a thermal control multilayer target damage image and a target surface external heat flow power density distribution map, and dividing the thermal control multilayer target damage image and the target surface external heat flow power density distribution map into N 2 grid units according to the whole target surface of the same scale according to N multiplied N grids to obtain the damage front image of the thermal control multilayer after a test, wherein the thermal control multilayer target damage image is a damage shape front image of the thermal control multilayer after the test and is used for judging the damage state in the grid units; judging the damage state of each grid unit, wherein the damage state comprises damaged and undamaged; Calculating the average power density corresponding to each grid unit; and determining the damage probability corresponding to the different average power densities respectively, and correspondingly, determining the threshold power density of the thermal control multi-layer under the different damage probabilities. Under the condition of adopting the technical scheme, the thermal control multi-layer target damage image and the out-of-target heat flow power density distribution map are divided into N 2 grid units, then the damage state of each grid unit is judged, and the average power density corresponding to the damage state is calculated, so that the damage state under each average power density can be accurately determined. Further, corresponding damage probability under different average power densities is determined by a statistical analysis method. Correspondingly, the threshold power density of the thermal contr