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Optimization method of cooling curve in vacuum brazing process of flat cracked antenna

A cracked antenna and cooling curve technology, which is applied in the field of optimization of the cooling curve in the vacuum brazing process of the flat cracked antenna, can solve the problems that it is difficult to guide the design of the manufacturing process, and the cooling curve stays in the analysis stage, so as to ensure the electrical performance and increase the shape , the effect of improving the accuracy

Inactive Publication Date: 2017-05-10
XIDIAN UNIV
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Problems solved by technology

[0007] The above studies have given the selection criteria for solder, but the research on the cooling curve is still in the analysis stage, and it is difficult to guide the design of the manufacturing process

Method used

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  • Optimization method of cooling curve in vacuum brazing process of flat cracked antenna
  • Optimization method of cooling curve in vacuum brazing process of flat cracked antenna
  • Optimization method of cooling curve in vacuum brazing process of flat cracked antenna

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Embodiment Construction

[0052] Specific embodiments of the present invention will be described in detail below.

[0053] refer to figure 1 , a method for optimizing the cooling curve in the vacuum brazing process of flat plate slit antenna, the concrete steps are as follows:

[0054] (1) According to the total cooling time TIME, select the appropriate number of Bezier curve segments m and times n, and determine the number of control points m (n+1), so that the control points are evenly distributed along the time axis. The temperature of the coordinates is the design variable, and the temperature design variable b is expressed as

[0055] find b=[b 0 ,b 1 ,... b m·(n+1)-1 ] T

[0056] where b i (i=0~m·(n+1)-1) is the ordinate of the control point;

[0057] At this time, the cooling curve can be expressed as

[0058]

[0059] (2) Calculate the temperature and cooling rate at different times according to the cooling curve, and determine the thermal expansion coefficients of the base metal an...

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Abstract

The invention relates to an optimization method of a cooling curve in the vacuum brazing process of a flat cracked antenna. The method comprises the following steps: (1) selecting appropriate Bezier curve segment number m and the number of times n according to the total cooling time TIME, and determining the number of the points requiring control m*(n+1); (2) calculating the temperature and cooling rate at different times according to the cooling curve, and determining the thermal expansion coefficients of the base metal and the brazing filler metal at different times; (3) calculating the radiation array mean square root value RMS of the antenna under the cooling curve by using the thermo-elastic-plastic finite element method; (4) giving the optimal constraint conditions; (5) on the premise that the position and slope of the Bezier curve are continuous, simplifying the constraint conditions obtained for the steps; (6) calculating an optimization model by a multi-island genetic algorithm, and extracting the optimal objective function value and the corresponding optimal design variable after the optimization stop condition is satisfied; and (7) obtaining a cooling curve form according to the optimal design variable.

Description

technical field [0001] The invention belongs to the field of antenna structure manufacturing technology, and in particular relates to a method for optimizing a cooling curve in the vacuum brazing process of a flat plate crack antenna. Background technique [0002] With the rapid development of electronic technology and information technology and the increasing military demand, the requirements for the electrical performance of electronic equipment are getting higher and higher, and electronic equipment is moving towards high frequency, high gain, high density, miniaturization, fast response, high Pointing to the direction of precision. [0003] As a typical electronic equipment, the planar slot antenna has the characteristics of high gain, low sidelobe, small size and light weight, and has been widely used in various electronic equipment such as airborne radar and missile guidance. As an important part of the radar, the planar slot antenna has strict precision requirements,...

Claims

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Application Information

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IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 宋立伟张超韩创李娜李鹏周金柱王从思
Owner XIDIAN UNIV
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