Three-freedom-degree simulation external store flutter model for wind tunnel test

Abstract

The invention provides a three-freedom-degree simulation external store flutter model for a wind tunnel test. The three-freedom-degree simulation external store flutter model comprises an external store, a rolling beam and a suspended beam suspended on an aircraft airfoil model. The rolling beam is arranged below the suspended beam and hinged to the suspended beam through a first hinged shaft, the first hinged shaft is horizontally arranged, the axial direction of the first hinged shaft is consistent with the length direction of the rolling beam, an elastic device is arranged below the rolling beam and hinged to the rolling beam through a second hinged shaft, the second hinged shaft is perpendicular to the first hinged shaft, and the external store is connected to the elastic device and can perform pitching motion relative to the rolling beam in the vertical direction through the elastic device. The three-freedom-degree simulation external store flutter model for the wind tunnel test can achieve decoupling and simulation in a three-freedom-degree vibration mode, and the design level of the external store flutter model and precision of flutter wind tunnel test results are greatly improved.

Description

technical field [0001] The invention relates to wind tunnel test technology, in particular to a three-degree-of-freedom simulation flutter model for external objects used in wind tunnel tests. Background technique [0002] The wind tunnel flutter test mainly refers to the test to determine the flutter critical speed of the aircraft (whole or component). When the flight reaches a certain speed, due to the interaction of aerodynamic and structural elastic vibrations, the aircraft will undergo a self-excited vibration called flutter, and the speed at this time is called the flutter critical speed. In the design work, in order to study the influence of external objects on the wing (such as engines, fuel tanks, weapons, etc.) on the flutter speed and ensure flight safety, flutter model wind tunnel tests are generally required. [0003] In the prior art, when carrying out the wind tunnel test of the flutter model of the airfoil with the external store, the external store model on...

AI Technical Summary

Problems solved by technology

In the prior art, the test results of the wind tunnel test of the flutter model of the airfoil with the external storage can only reflect the flutter results of the coupling of the external storage pitch mode and the airfoil, and cannot reflect the two vibrations of the external storage model yaw and roll modes Mode Effects on Flutter Velocity

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