Method for determining sectional dimension of thin-walled rectangular hollow beam with lugs

Abstract

The invention belongs to the field of structural mechanics, and in particular relates to a method for determining the sectional dimension of a thin-walled rectangular hollow beam with lugs for design of a high-speed flutter model. The method for determining the sectional dimension of the thin-walled rectangular hollow beam with the lugs is characterized by comprising the following steps of: figuring out rectangular equivalent width a1 and equivalent height b1 of the thin-walled rectangular hollow beam which has predetermined values of vertical dimension moment of inertia Ix, polar moment of inertia J and wall thickness t; adjusting the predetermined polar moment of inertia J; figuring out an equivalent width a and an equivalent height b; and figuring out a total width L of sections of the hollow beam when the thin-walled rectangular hollow beam with the lugs has predetermined values of lateral moment of inertia Iy and lug thickness t (which is equal to the wall thickness t). According to the invention, the precision of the rigidity of the section of the model is increased, the uncertainty in the model design is reduced, the time for determining the sectional dimension is shortened, and the design efficiency of the 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 thin-walled rectangular hollow beam with lugs for high-speed flutter model design. Background technique [0002] The high-speed flutter model can be used to obtain the transonic flutter characteristics of the aircraft and its components, and the high-speed flutter model usually requires a small beam mass to provide a large airfoil stiffness, and in order to meet the three-dimensional stiffness design Rectangular thin-walled hollow beam section with lugs is an ideal design form. At present, it is usually necessary to obtain the cross-sectional size that meets the requirements by 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 wall thickness and lug thickness t, rectangular equivalent width a, equivalent height b, and the total width L o...

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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. The accuracy of section stiffness increases the uncertainty of model design; second, to determine the section size by trial and error, multiple rounds of manual adjustment and judgment are required, which takes a long time and low efficiency, seriously affecting the model design cycle

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