Active vibration suppression device applied to vibration suppression of wind tunnel model

Abstract

The invention provides an active vibration suppression device applied to vibration suppression of a wind tunnel model. The active vibration suppression device comprises a three-directional acceleration sensor, an active vibration suppression module internally provided with a piezoelectric ceramic actuator and a control cabinet provided with control system software; the three-directional acceleration sensor is arranged in a test module and measures first two-order low-frequency vibration signals, generated due to wind-load excitation, of a test model system and outputs the signals to the control cabinet; the control cabinet conducts discrete sampling on the signals, then calculates and generates a control signal through a self-adaptive feedback control algorithm and outputs the control signal to drive the piezoelectric ceramic actuator in the active vibration suppression module, and by controlling the axial displacement of a pitching and yawing piezoelectric ceramic component, the testmodule generates pitching vibration and yawing vibration or coupled vibration of the pitching vibration and the yawing vibration separately. The active vibration suppression device can achieve decoupling control over first two-order modal vibration, the low-frequency vibration of the wind tunnel test model due to wind-load excitation is effectively reduced, and the device not only is effective forlow-frequency line spectra but also has a good control effect on broadband random excitation.

Description

technical field [0001] The invention relates to an active vibration suppressing device, in particular to an active vibration suppressing device used in aerospace engineering and applied to the vibration control of a wind tunnel model. Background technique [0002] The wind tunnel test generally adopts the tail support method. The test model is fixed on the middle bracket through the built-in balance and the balance rod. The middle bracket is installed at the rear of the wind tunnel test section. The test model system constituted in this way is a typical cantilever type. structure. During the wind tunnel test, affected by the unsteady aerodynamic force, the cantilever test model system will generate low-order modal vibrations, and the test model has the largest vibration amplitude because it is located at the free end of the cantilever structure. Large-scale low-frequency vibration will not only endanger the accuracy of aerodynamic test data, but also lead to fatigue damage ...

AI Technical Summary

Problems solved by technology

This kind of actuating mechanism has a compact structure and can be installed at the head or tail of the balance pole. It does not require special structural design for different test models, but the disadvantage is that it cannot decouple the pitch and yaw vibrations of the test model. Different piezoelectric ceramic components will affect each other when they work, the control system is complex, and the stability and reliability are affected

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