Aircraft structural load transmission characteristic model test designing method

Abstract

The invention belongs to the technical field of structure / strength test and relates to an aircraft structural load transmission characteristic model test designing method. The aircraft structural load transmission characteristic model test designing method comprises the steps of, firstly, determining the scaling ratio of a model craft, and selecting materials identical to the raw materials of a prototype craft, setting a ratio of stress similitude of C sigma=sigma prototype / sigma model, a ratio of strain similitude of C epsilon=epsilon prototype / epsilon model, a ratio of displacement similitude of C delta=delta prototype / delta model, and a ratio of plane force similitude of Cq=q prototype / q model; secondly, according to the theory of similarity and equation analysis methods, deriving the following similarity indexes including a geometric equation of CL*C epsilon / C delta=1, a physical equation of C epsilon / C sigma=1, a force boundary condition of Cq / C sigma=1, a concentrated force of CF / C sigma*C2L=1 and a concentrated moment of CM / C sigma*C3L=1; thirdly, ensuring no change of stress and strain in the prototype craft and the model craft, namely, C epsilon=1, C sigma=1, F prototype / F model=CF=C2L, M prototype / M model=CM=C3L, and delta prototype / delta model=C delta=CL, and ensuring identical constraints during a model test and exerting the following load of F model=F prototype / C2L, and M model=M prototype / C3L during model test; fourthly, according to physical quantity measured during the model test, inversing the physical quantity of the prototype craft by following the following relations including displacement of delta prototype=delta model CL, strain of epsilon prototype=epsilon model, and stress of sigma prototype=sigma model. The aircraft structural load transmission characteristic model test designing method can accurately and rapidly evaluate structural load transmission characteristics and reduce the design risk during aircraft scheme approachment.

Description

technical field [0001] The invention belongs to the technical field of structure / strength tests, and relates to a design method for model tests of aircraft structure load transmission characteristics. Background technique [0002] In the early stage of aircraft structure design, there are often many different layout schemes. For some particularly important schemes, it is necessary to study the load-carrying characteristics of the structure through the static test of the whole machine, verify the numerical analysis results, and finally evaluate the structural efficiency accurately and relatively quickly. It is unrealistic to carry out a full-scale static test at this stage, and it requires a huge investment of time and economic costs. Therefore, it is very necessary to seek a static model test design method for the aircraft structure. Contents of the invention [0003] Purpose of the present invention: provide a kind of static model test design method of aircraft structur...

AI Technical Summary

Problems solved by technology

It is unrealistic to conduct a full-scale static test at this stage, and it requires a huge investment of time and economic costs

Images