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Method for indirectly measuring deformation of antenna structure based on strain sensors

A technology of strain sensor and antenna structure, applied in the field of antenna structure, can solve the problems of difficulty in selecting the number and position of sensors, etc.

Inactive Publication Date: 2014-05-07
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For simple structures, experienced engineering testers can easily determine the position of the sensor, but for complex structures, it is quite difficult to select the number and position of sensors

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  • Method for indirectly measuring deformation of antenna structure based on strain sensors
  • Method for indirectly measuring deformation of antenna structure based on strain sensors
  • Method for indirectly measuring deformation of antenna structure based on strain sensors

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Embodiment Construction

[0093] The present invention will be further described below in conjunction with the accompanying drawings.

[0094] Such as figure 1 As shown, a kind of indirect measurement method of the deformation of the antenna structure based on the strain sensor proposed by the present invention comprises the following steps:

[0095] 1) Determine the minimum complete mode set including the deformation of the antenna structure under each working condition

[0096] Since the number of load cases subjected to the antenna structure is limited, the deformation information can be concentrated on a few modes. The relative size of the modal coordinates reflects the contribution of each mode to the structural deformation. Therefore, the minimum modal set that can describe the deformation of the antenna structure can be determined with a certain accuracy. The specific steps are as follows:

[0097] 1a) Assuming that the antenna structure needs to work under M load conditions, the deformation d...

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Abstract

The invention discloses a method for indirectly measuring the deformation of an antenna structure based on strain sensors. The method comprises the following steps: (1) sorting alternative modals based on a modal coordinate evaluation vector and according to the participation deformation degree, and obtaining a minimum complete modal set capable of describing the deformation of an antenna structure according to the linear correlation between deformation vectors before and after modal deletion; (2) adopting an effective independence method to carry out sensor arrangement, and deleting the degree of freedom with minimum contribution to the independence of a target modal until the remaining number of degree of freedom is the same with the number of the sensors; (3) calculating a mapping matrix with the use of numerical simulation and measured data according to the linear relationship between the displacement and strain of the antenna structure under the condition of small deformation; and (4) using the sensors arranged in specified positions to measure the displacement, obtained through the mapping matrix after strain of the antenna structure, of the antenna structure according to the corresponding relationship between strain and displacement. By the adoption of the method of the invention, the deformation of an antenna can be indirectly measured by strain sensors, and the method has the advantages of small amount of calculation, high computing speed and high real-time performance.

Description

technical field [0001] The invention relates to the field of antenna structures, in particular to an indirect measurement method for deformation of antenna structures based on strain sensors. Background technique [0002] Planar antennas are widely used in modern satellite communication systems, space science and other fields. The accuracy of the reflector is one of the important indicators to measure the performance of the antenna, and with the increase of the antenna aperture and the increase of the operating frequency, the requirements for the accuracy of the reflector are getting higher and higher. However, the antenna is subjected to various loads during its working process. In addition to its own gravity, the antenna is also subjected to temperature loads, wind loads, ice and snow loads, etc., which will cause deformation of the reflective surface. This deformation will directly affect the electrical performance of the antenna, and even cause the antenna to lose its f...

Claims

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Application Information

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IPC IPC(8): G01B21/32
Inventor 杜敬利保宏魏传达赵泽段学超韩生弟
Owner XIDIAN UNIV
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