Ground simulation predicting method and system for aeroelasticity stability

Abstract

The invention provides a ground simulation predicting method and a ground simulation predicting system for aeroelasticity stability and is used for predicting the aeroelasticity stability boundary of a structure to be tested. The whole system comprises a support system, a tested structure, a moving signal sensor, a data collecting card, a force sensor, an aerodynamic computation computer and force loading equipment. The method can be directly applied to the practical structure, so the inherent characteristics of the structure can be reserved, and testing results are truer and more reliable. The method and the system have the advantages that the defects of the traditional testing can be effectively overcome, the advantages of ground vibration tests and wind tunnel tests are combined, the aeroelasticity stability predication can be completed in a short time and at lower cost, and meanwhile, the risk of flight tests can also be avoided.

Description

technical field [0001] The invention relates to a ground simulation prediction method and system for aeroelastic stability, which is specifically used to determine the critical stable state of aeroelasticity. Background technique [0002] At present, there are mainly two ways to predict aeroelastic stability: theoretical analysis and experiment. The former requires mathematical modeling of aircraft objects, while in the aeroelastic modeling process, certain assumptions need to be introduced in terms of structure and aerodynamics. It is difficult to consider the influence of various nonlinear factors in the real structure during calculation, and there will be certain errors in modeling . The latter verifies the correctness of the theoretical method and further ensures the safety of the aircraft by carrying out the dynamic characteristic test of the aircraft. Aeroelasticity tests mainly include ground vibration tests, wind tunnel tests and flight tests. The ground vibration...

AI Technical Summary

Problems solved by technology

The ground vibration test is a real aircraft structure, but the aerodynamic effect cannot be considered

The influence of aerodynamic force can be considered in the wind tunnel test, but due to the influence of the size of the wind tunnel and the limitation of wind speed, the designer usually scales the size of the actual aircraft. There is a certain difference between the scale model and the real structure, and due to the interference of the wind tunnel wall, Inherent limitations such as bracket interference, wind tunnel test results are somewhat different from real aircraft characteristics; in addition, for high-speed, thermal environments, etc., wind tunnel tests are expensive and difficult to implement, and there is still no cost-effective test method

Flight test, using real aircraft for on-site flight, has the advantage of not being limited by various simplified assumptions, and the test results are the most authentic and reliable, but flight test also has its own unique complexity and danger

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