A wind tunnel tail strut structure suitable for active vibration reduction in low temperature environment

Abstract

The invention discloses a wind tunnel tail supporting rod structure suitable for active vibration reduction in a low-temperature environment. The structure comprises a tail supporting rod front section, a tail supporting rod rear section, a heating and heat preservation unit and a plurality of piezoelectric stacks. The rear end of the tail supporting rod front section is connected with the front end of the tail supporting rod rear section. The piezoelectric stack is arranged between the tail supporting rod front section and the tail supporting rod rear section. The front section of the tail supporting rod is provided with first positioning grooves corresponding to the piezoelectric stacks. The rear section of the tail supporting rod is provided with second positioning grooves correspondingto the piezoelectric stacks, one end of each piezoelectric stack is arranged in the corresponding first positioning groove, the other end of each piezoelectric stack is arranged in the correspondingsecond positioning groove, and the heating and heat preservation unit comprises a piezoelectric stack heating film arranged on the corresponding piezoelectric stack in a sleeving mode. The wind tunneltail supporting rod structure suitable for active vibration reduction in the low-temperature environment can normally and actively reduce vibration in the low-temperature environment.

Description

technical field [0001] The invention relates to the technical field of wind tunnel tail struts, in particular to a wind tunnel tail strut structure suitable for active vibration reduction in low temperature environments. Background technique [0002] In wind tunnel tests, both the balance and the tail strut have vibration problems, especially for transonic wind tunnel tests. Under the action of unsteady aerodynamics, the model is prone to large vibrations at large angles of attack, which affects the measurement accuracy of the balance for aerodynamic loads, and is not conducive to the design and test of aircraft structures. And when the vibration problem is serious, it may even cause damage to the balance and the tail support rod. In the process of using the low-temperature and high-speed wind tunnel, if the connecting screws of the model parts fall off, the impact of the high-speed airflow will bring damage to the entire wind tunnel system. unforeseen damage. [0003] Vib...

AI Technical Summary

Problems solved by technology

However, the existing research and inventions only involve active vibration reduction at room temperature, and the performance of the piezoelectric stack will be significantly reduced at low temperatures, and the metal structure and the piezoelectric stack will undergo obvious thermal deformation, so measures need to be taken to reduce the vibration of the piezoelectric stack. Heating and heat preservation of the stack and related structures, and reducing the influence of thermal stress caused by thermal deformation on active vibration reduction

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