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Rapid checking method for damage of modal test-based spaceborne antenna structure

A spaceborne antenna, modal test technology, applied in the testing of machine/structural components, vibration testing, measuring devices, etc., can solve the problems that are difficult to detect, must be positioned, repaired, and hidden dangers left by the normal use of the spaceborne antenna structure.

Active Publication Date: 2013-01-30
XIAN INSTITUE OF SPACE RADIO TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

The forms of damage to the spaceborne antenna structure can be roughly summarized as: cracks, degumming, partial fractures, etc. Some forms of damage are difficult to detect and difficult to detect by visual inspection, but they will leave hidden dangers for the normal use of the spaceborne antenna structure, which must be located and repaired

Method used

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  • Rapid checking method for damage of modal test-based spaceborne antenna structure
  • Rapid checking method for damage of modal test-based spaceborne antenna structure
  • Rapid checking method for damage of modal test-based spaceborne antenna structure

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Embodiment Construction

[0028] The present invention first uses mature commercial finite element software to carry out modal analysis on the structure of the spaceborne antenna, and initially estimates its modal parameters theoretically; then, according to the modal analysis results, arranges sensor measuring points, selects suitable sensors, tests Equipment, etc., build a rapid modal test system; test the modal characteristics of the spaceborne antenna structure before the vibration test; finally, test the modal characteristics of the spaceborne antenna structure again after the vibration test. If the modal characteristics of the spaceborne antenna structure change before and after the test, the change trend of the modal characteristics can be used to judge whether the spaceborne antenna structure is damaged, the location of the damage, the form of damage, the degree of damage, etc. After the spaceborne antenna structure is repaired, the effect of the spaceborne antenna structure repair is judged by ...

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Abstract

The invention discloses a rapid checking method for damage of a modal test-based spaceborne antenna structure. The rapid checking method comprises the steps as follows: carrying out modal analysis on the spaceborne antenna structure to initially estimate modal parameters of the spaceborne antenna structure; establishing a rapid modal test system to detect modal characteristics of the spaceborne antenna structure before a vibration test; and finally, detecting the modal characteristics of the spaceborne antenna structure again after the vibration test. Whether the spaceborne antenna structure is damaged and damage position, damage form, damage degree and the like are judged through change trend of the modal characteristics. After the damaged spaceborne antenna structure is repaired, effect of repairing the spaceborne antenna structure is judged through detecting changes of the modal characteristics before and after being repaired. The rapid checking method has the advantages of rapidness, simplicity, easiness in quantification, lower cost and the like, can be widely applied to the spaceborne antenna structure and various space structures, and is strong in practicality and market competiveness in the field of the spaceborne antenna structure.

Description

technical field [0001] The invention relates to a method for checking the damage of a space-borne antenna, which is mainly based on the modal test technology to judge the damage mode and position of the space-borne antenna structure, and belongs to the technical field of space-borne antenna structure testing. Background technique [0002] A mode is an inherent property of a structure, and each mode has a specific modal frequency, damping ratio, mode shape, modal mass, and modal stiffness. These modal parameters can be obtained by experiment or calculation, such a process of experiment or calculation is called modal analysis. The complete modal analysis method is to obtain the relationship between the internal system of the structure and the input and output through certain excitation and data acquisition methods. By analyzing the test data, the modal frequencies of each order of the structure are stripped out, and the modal characteristic parameters of the structural system...

Claims

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Application Information

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IPC IPC(8): G01M7/02
Inventor 方永刚薛永刚高博于新战牛宝华李涛杨俊良梁月华
Owner XIAN INSTITUE OF SPACE RADIO TECH
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