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Method for obtaining bending equivalent stiffness of skin stiffened cylindrical shell structure

A technology of equivalent stiffness and acquisition method, which is applied in the direction of machine/structural component testing, measuring devices, instruments, etc., can solve the problems of low acquisition efficiency and large error, and achieve the effect of simple and fast bending stiffness

Inactive Publication Date: 2013-12-18
BEIJING INST OF ASTRONAUTICAL SYST ENG +1
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Problems solved by technology

[0004] For the skin-reinforced cylindrical shell structure, the bending stiffness obtained by the existing equivalent area method is not much different from the real value at the low-order bending frequency obtained, but as the order increases, the error will become larger and larger
However, if a complex shell-beam model is established, although the acquisition accuracy is high, the acquisition efficiency will be reduced

Method used

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  • Method for obtaining bending equivalent stiffness of skin stiffened cylindrical shell structure
  • Method for obtaining bending equivalent stiffness of skin stiffened cylindrical shell structure
  • Method for obtaining bending equivalent stiffness of skin stiffened cylindrical shell structure

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Embodiment Construction

[0021] Step 1. Collect the elastic modulus E, skin shell diameter D, and skin shell thickness δ of the skin and stringers made of the same material in the skin-reinforced cylindrical shell structure; the collected stringers have a total of m Class stringers, and then collect the number N of class i stringers i , cross-sectional area A bi , where i=1,2,...,m;

[0022] Step 2. According to the skin shell diameter D and the number N of the i-th stringers of the skin-reinforced cylindrical shell structure collected i , cross-sectional area A bi , and then obtain the total equivalent thickness of stringers t b ;

[0023] t b = Σ i = 1 m N i A bi / πD ;

[0024] Step 3. For the skin-reinforced cylindrical shell structure, the total equi...

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Abstract

The invention relates to a method for obtaining the bending equivalent stiffness of a skin stiffened cylindrical shell structure. The method comprises the following steps: step 1, the skin elasticity modulus, stringer torsional elasticity modulus, skin shell diameter and skin thickness of the skin stiffened cylindrical shell structure are collected respectively, wherein collected stringers are of m categories totally, and then the number and sectional area of the stringers in each category are collected; step 2, the total equivalent thickness of the stringers is obtained; step 3, the total equivalent thickness and total area equivalent moment of inertia of the skin stiffened cylindrical shell structure are obtained; step 4, optimization factors of second moment of area are obtained; step 5, modified second moment of area is obtained; step 6, the total actual bending stiffness of the skin stiffened cylindrical shell structure is obtained. The method for obtaining the bending equivalent stiffness of the skin stiffened cylindrical shell structure solves the problem that the deviation of the bending stiffness causes the situation that errors of bending frequency are gradually increased along with the increase of orders, and can be used for obtaining the bending stiffness of the skin stiffened cylindrical shell structure reasonably, easily and quickly.

Description

technical field [0001] The invention relates to a method for obtaining equivalent bending stiffness, in particular to a method for obtaining equivalent bending stiffness of a typical skin-reinforced cylindrical shell structure of a carrier rocket and a liquid missile. Background technique [0002] The skin-reinforced cylindrical shell structure is composed of skin shells, stringers, and ring frames. It has high strength, rigidity, and lightweight characteristics, and is widely used in rocket structures. [0003] Based on the research on the dynamic modeling method of the skin-reinforced cylindrical shell structure, especially the research on the equivalent method of bending stiffness, a reasonable lateral dynamic model of the skin-reinforced cylindrical shell structure is established, and the accurate low-order lateral characteristics of the rocket are obtained. For the rocket Load calculation and attitude stability analysis are very critical. [0004] For the skin-reinforc...

Claims

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Application Information

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IPC IPC(8): G01M99/00
Inventor 潘忠文廉永正曾耀祥董锴王旭杨树涛徐庆红王明宇
Owner BEIJING INST OF ASTRONAUTICAL SYST ENG
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