Method for determining overweight ratio of plane flutter model

Abstract

The invention belongs to the field of aviation structural mechanics, and relates to a design method for obtaining the overweight ratio of a flutter model in the design of the flutter model. The method comprises the following steps of: calculating the equivalent mass mBE of a reference beam frame according to a reference beam frame model, and calculating the equivalent mass ratio nBE of the reference beam frame in combination with the component mass mA; calculating a design scale coefficient ndss; specifying a section shape coefficient ns; specifying the mass ratio kb of a flutter model beam; and calculating the overweight ratio nG of the flutter model. In According to the method disclosed by the invention, a reverse design method is used for replacing a trial and error method adopted in the conventional model design, so that various factors possibly influencing model weight and mathematical relations thereof are considered at the start of model design, the overweight ratio of the model is further obtained, the uncertainty of model design is reduced, and the model design period is shortened greatly.

Description

technical field [0001] The invention belongs to the field of aerostructure mechanics, in particular to a method for determining the overweight ratio of an aircraft flutter model. Background technique [0002] Flutter models can be used to obtain the flutter characteristics of aircraft and its components. In the design of flutter models, the interference of overweight problems is often encountered, especially the design of high-speed flutter models usually requires a small beam mass to provide a large airfoil stiffness, which highlights the problem of overweight in flutter model design. seriousness. In addition, for some low-speed flutter model design problems, the situation is just the opposite, that is, the target mass is too large. If the flutter model design meets the target mass, the static deformation of the model will be too large, which will be unfavorable to the test. Therefore, it should be Correspondingly, an "overweight ratio" smaller than 1 is added. [0003] ...

AI Technical Summary

Problems solved by technology

[0004] First, model design relies heavily on the experience of designers, which increases the uncertainty of model design;

[0005] Second, the acquisition of the superweight ratio requires multiple rounds of redesign and calculation, which takes a long time and is inefficient, which seriously delays the model design cycle and affects the progress of aircraft development.

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