A vibration suppression system and method for wind tunnel experiment struts based on piezoelectric technology

Abstract

The invention provides a wind tunnel experiment strut vibration suppression system and method based on a piezoelectric technology. The system comprises a laser displacement sensor, a data collector, a control calculation module, a closed loop amplification module and a piezoelectric actuator. The method comprises the steps that: the laser displacement sensor collects the normal vibration displacement of a controlled strut; a normal vibration displacement signal is converted into a normal vibration displacement digital amount through the data collector; the normal vibration displacement digital amount is used as feedback control and is sent to the control calculation module; an actuating control voltage signal is obtained through performing PID control in the control calculation module; the actuating control voltage signal is amplified to drive the piezoelectric actuator to generate an actuating force to increase structure damping of the system, so that the vibration of the strut in the wind tunnel experiment is suppressed, the strut vibration caused by the impact of a wind tunnel starting impacting load to the model is reduced, the wind tunnel test device and the tested model structure are protected and the signal to noise ratio of the dynamic wind tunnel experiment data is increased.

Description

technical field [0001] The application field of the invention is a ground wind tunnel experiment, covers an experimental device vibration suppression system and method, and belongs to the fields of aerodynamics and aerospace engineering. Background technique [0002] During the ground wind tunnel experiment, when the temporary wind tunnel is started, due to the impact of the airflow, the experimental model and the struts are subjected to a large dynamic impact load, which is generally 3 to 5 times the static load. For the temporary wind tunnel, during the start-up phase, the impact caused by such a dynamic load cannot be avoided. Such a load will cause a decrease in the signal-to-noise ratio of the collected signal and bring additional errors to the actual wind tunnel test of the equipment under test. , deviate from the real physical process, and in extreme cases, it will cause the balance in the model under test in the wind tunnel or the balance in the wind tunnel test rod ...

AI Technical Summary

Problems solved by technology

[0003] The technical problem solved by the present invention is: to overcome the deficiencies in the prior art, to provide a system and method for suppressing the vibration of the wind tunnel test strut based on piezoelectric technology, and to solve the problem of the measured model or the wind tunnel test strut in the wind tunnel test device. The problem that the connected balance is damaged by dynamic impact load and the signal-to-noise ratio of the wind tunnel test is reduced, and the structural safety and signal-to-noise ratio of the wind tunnel test device and the side model are improved, thereby improving the test accuracy

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