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Method for determining structural parameters of circular-arch-shaped reinforcing frame for bearing antisymmetric concentrated loads

A technology of concentrating loads and structural parameters, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of affecting the accuracy of structural parameters and inaccurate boundary condition simulation, and improve the "circular arch" machine. The effect of structural parameter design of body reinforcement frame and optimization of iterative efficiency and improvement of simulation analysis accuracy

Active Publication Date: 2021-04-23
XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for determining the structural parameters of the circular arched fuselage reinforcement frame when it is subjected to antisymmetric concentrated loads, so as to overcome the inaccurate simulation of the boundary conditions and the influence of the traditional method on the lack of consideration of the bending moment at the end face of the support. Accuracy of structural parameter optimization design

Method used

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  • Method for determining structural parameters of circular-arch-shaped reinforcing frame for bearing antisymmetric concentrated loads
  • Method for determining structural parameters of circular-arch-shaped reinforcing frame for bearing antisymmetric concentrated loads
  • Method for determining structural parameters of circular-arch-shaped reinforcing frame for bearing antisymmetric concentrated loads

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Embodiment

[0095] Taking the empennage connection frame 72 in the "big opening" area of ​​the rear body of a certain type of transport aircraft as an example, the preliminary strength design of the structural parameters of the "round arch" fuselage reinforcement frame is carried out. Among them, the empennage connection frame 72 frame height H=590mm, the concentrated load action point angle α=9°, the “big opening” angle 2β=132°, the fuselage radius R=2330mm; the reinforcement frame material 7050-T7451, σ b =485MPa, σ 0.2 = 415MPa.

[0096] Step 1: Calculation of internal force values ​​such as bending moment and shear force at any section of the "circular arch" fuselage reinforcement frame:

[0097] Antisymmetric load 104820 working condition, concentrated force T / 2=596498.3N.

[0098] First, according to the analytical solution of the reaction force of the support end face in step 2 of the present invention, the vertical reaction force R at the support end face of B can be calculated ...

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Abstract

The invention discloses a method for determining structural parameters of a circular-arch-shaped reinforcing frame bearing an antisymmetric concentrated load, which comprises the following steps of: establishing a mathematical model of the circular-arch-shaped reinforcing frame, and analyzing the stress state and deformation coordination conditions of the circular-arch-shaped reinforcing frame when the circular-arch-shaped reinforcing frame bears the antisymmetric concentrated load, generating bending moment in the clockwise or anticlockwise direction on the supporting end face; determining expressions of bending moment and shearing force of any section of the circular-arch-shaped reinforcing frame; and determining the thickness of a web plate of any section of the reinforcing frame according to a corner corresponding to any section of the reinforcing frame on the basis of the obtained shear force expression of any section of the circular-arch-shaped reinforcing frame, and determining the area of a frame edge strip of any section of the reinforcing frame. According to the method, the problems that the boundary condition simulation is not accurate enough and the accuracy of the structural parameter optimization design is influenced due to the fact that the bending moment at the supporting end face is not considered in a traditional method are solved.

Description

technical field [0001] The invention relates to the field of structural strength design, in particular to a method for determining structural parameters when a circular arch fuselage reinforcement frame bears an antisymmetric concentrated load. Background technique [0002] In modern aircraft design, the scheme design, structural layout, and parameter optimization of key connection areas require the intervention of strength designers in advance. Usually, under the condition that the whole aircraft finite element stress solution is not available, the connection is actively designed according to the preliminary load or the load of the same type of aircraft. Preliminary parameters of the typical structure of the area to reduce iteration steps, improve design efficiency, and then grasp the design and optimization direction of the key connection area structure. [0003] Large-scale transport aircraft at home and abroad usually have a large cargo door on the rear fuselage to meet ...

Claims

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Application Information

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IPC IPC(8): G06F30/15G06F119/14
CPCG06F30/15G06F2119/14
Inventor 张洪智刘彦杰张彬
Owner XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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