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Method for determining sectional dimension of rectangular beam with lugs

A technology of cross-section size and rectangular beam, which is applied to the determination of the cross-section size of rectangular beams, can solve the problems such as the accuracy affecting the stiffness of the model section, the large error of dimensional data, and the long time, so as to shorten the time for determining the cross-section size and improve the design efficiency. , the effect of reducing uncertainty

Active Publication Date: 2012-04-11
XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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  • Abstract
  • Description
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Problems solved by technology

The trial and error method has the following disadvantages: First, the adjustment of the section size data requires the experience of the designer, and the size data given by experience often has a large error, and it may even be difficult to adjust the size that meets the design requirements, which affects the model. Accuracy of section stiffness, increasing uncertainty in model design
Second, to determine the size of the section by trial and error, multiple rounds of manual adjustment and judgment are required, which takes a long time and is inefficient, seriously affecting the model design cycle

Method used

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  • Method for determining sectional dimension of rectangular beam with lugs
  • Method for determining sectional dimension of rectangular beam with lugs
  • Method for determining sectional dimension of rectangular beam with lugs

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Embodiment

[0057] The method of the present invention is verified by calculation.

[0058] Three sets of cross-sections are given, and the cross-sections P1 to P3 are Example 1 to Example 3, respectively. Table 1 gives the predetermined values, ie target values, of the geometrical properties of the three embodiments. For P1, let t=2.0mm, and for P2 and P3, let t=1.0mm, and design the cross-sectional dimension. Table 1 also gives the geometrical properties of the design section obtained using the method of the present invention, that is, the design value, and the error of the design value. Table 2 gives the dimensional design values ​​for the three examples.

[0059] The design values ​​of the section geometric characteristics in Table 1 are calculated according to the corresponding section dimensions in Table 2 by FEMAPv9.31. Compared with the target value, the error of the design section characteristic value is not more than 2%. From an engineering point of view, this is a high-preci...

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Abstract

The invention belongs to the field of structural mechanics and relates to a method for determining the sectional dimension of a rectangular beam which is provided with lugs and used for flutter model design. The method for determining the sectional dimension of the rectangular beam with the lugs is characterized by comprising the following steps of: calculating the half width ar and the half height br of a rectangular section when a rectangular beam without any lug has a vertical inertia moment Ix and a polar inertia moment J which have preset values; adjusting the preset polar inertia momentJ; calculating the half width a and the half height b; and calculating the sectional half width l of the rectangular beam with the lugs when the rectangular beam with the lugs has a lateral inertia moment Iy and the lug thickness t which have the preset values. By the method, the precision of sectional rigidity of a model is improved, the uncertainty of model design is reduced, the time required by determining the sectional dimension is shortened, and the efficiency of designing a flutter model is improved.

Description

technical field [0001] The invention belongs to the field of structural mechanics, and relates to a method for determining the section size of a rectangular beam with lugs for flutter model design. Background technique [0002] For the design of the aircraft flutter model of the wing with large aspect ratio, the structural form of the single beam model is widely used in the wing, fuselage, tail and other structures. In order to meet the design requirements of three-dimensional stiffness, a rectangular section with lugs is an ideal design form. In the past, it was usually necessary to obtain the cross-sectional size that meets the requirements by means of trial and error. The idea of ​​​​the trial and error method is as follows: first, a set of dimensional data is given based on experience, including the thickness t of the ear piece, the half width a of the rectangle, the half height b and the half width l of the section; secondly, the characteristics of the section are calc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 罗务揆洪兆贵谢怀强
Owner XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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