Large-scale low-speed wind tunnel flutter test full-mold supporting device

Abstract

The invention discloses a large-scale low-speed wind tunnel flutter test full-mold supporting device which comprises a model suspension frame and a plurality of steel ropes, wherein a position adjusting mechanism is installed on the model suspension frame, one end of each of two vertical steel ropes is connected with the position adjusting mechanism through a set of suspension springs, and the other end of each vertical steel rope is connected with a model machine body; the upper and lower ends of the two front steel ropes are fixedly connected with the upper and lower walls of a wind tunnel respectively; the upper ends of the two rear steel ropes are fixedly connected with the upper wall of the wind tunnel; the lower end of each rear steel rope sequentially penetrates through a lower holewall connecting pulley, a wind tunnel lower hole wall and a counter weight connecting pulley on the corresponding side to be connected with a group of counter weight; the two transverse steel ropes are fixedly connected with the left side and the right side of a model fuselage respectively; the two ends of each transverse steel rope are connected with the front steel rope and the rear steel roperespectively; and the transverse steel ropes are combined with the counter weights to tension the front steel rope and the rear steel rope towards the model, so that the model can move in multiple directions. The large-scale low-speed wind tunnel flutter test full-mold supporting device is small in additional mass to the model, small in aerodynamic interference and suitable for different models.

Description

technical field [0001] The invention relates to a large-scale low-speed wind tunnel flutter test full-mode support device. Background technique [0002] Flutter is a very dangerous vibration that is caused by aeroelasticity, does not attenuate aircraft components, and has a relatively large amplitude. For aircraft, flutter often causes disastrous consequences of aircraft crashes, so determine the criticality of aircraft flutter. Speed ​​is a critical aspect of aircraft design. As far as the current technical level is concerned, it is too risky and expensive to use real aircraft for flutter tests, and model flutter wind tunnel tests still play an important role in flutter analysis. [0003] Wind tunnel flutter tests include individual component flutter tests, combined component flutter tests and full-mode flutter tests. In the case of a large degree of coupling between components, using component models to conduct flutter tests to verify the flutter characteristics of aircr...

AI Technical Summary

Problems solved by technology

For example, some forms of flutter may be caused by the coupling of rigid body motion modes and structural elastic modes. The dynamic characteristics of such flutter forms will be affected by the restraint load of the support device, which will seriously bias the flutter test results.

However, if the support device is required to allow arbitrary free rigid body movement of the model, it is difficult to design the support device to ensure the safety of the model and the wind tunnel

[0005] In the low-speed flutter full-mode test, when the model is approaching or fluttering, the support system may have additional mass in the flutter mode, and some support devices have greater aerodynamic interference on the model. The full-mode support device for the above-mentioned flutter test will affect the accuracy of the test results

Images