A Flutter Model Based on Prestressing Technology and Its Design Method

Abstract

The application belongs to the field of aeroelasticity, and in particular relates to a flutter model based on prestress technology and a design method thereof. The model includes: beam frame (2), prestressed steel wire (1) and wooden frame. The beam frame (2) is provided with a boss (3), and a through hole is opened on the boss (3); the prestressed steel wire (1) passes through the through hole and is installed on the boss ( 3); the wooden frame is single-point bonded on the beam frame (2). The flutter model and its design method based on the prestressing technology of the present application design the flutter model through finite element calculation and prestressed steel wire to meet the variable parameter requirements; the actual model is controlled by the threaded connection at both ends of the prestressed steel wire and the extensometer The prestress size, the designed flutter model has a simple structure, which increases the stiffness variable parameter capability of the model and saves the cost of stiffness variable parameters.

Description

technical field [0001] The application belongs to the field of aeroelasticity, and in particular relates to a flutter model based on prestress technology and a design method thereof. Background technique [0002] In the field of aerospace, wind tunnel flutter tests are carried out by designing wind tunnel models similar to aircraft to ensure the safety of aircraft flutter. [0003] At present, the model design of the low-speed wind tunnel flutter test mainly has the following two structural forms. One is the beam frame as the main load-bearing member. The method is mainly used for low-speed wind tunnel models; the second is to use the plate as the load-bearing member. The thickness of the plate is different at different parts of the airfoil, and the foam is glued on it for shape dimensioning. The above two methods have certain limitations when changing the stiffness research. For example, only the stiffness of the spring leaf at the root of the airfoil can be changed, or th...

AI Technical Summary

Problems solved by technology

The above two methods have certain limitations when changing the stiffness research. For example, only the stiffness of the spring leaf at the root of the airfoil can be changed, or the stiffness of the rudder surface connection can be changed. However, in the initial research stage of the scheme, it is often necessary to carry out research on more parts. Stiffness variable parameter research, such as the stiffness of a beam or a certain rib, or the overall bending stiffness, etc., it is difficult to achieve variable parameters in the same model according to the traditional structural form, and an additional model needs to be processed. When there are many stiffness variable parameters, in terms of funds often unacceptable

Images