A Model-adaptive Active Vibration Suppression Method

Abstract

The invention belongs to the field of active vibration control of an aircraft wind tunnel model, and provides a model-adaptive vibration active suppression method. The method first obtains the open-loop frequency response and natural frequencies of each order by performing sinusoidal sweep frequency excitation on a model support system. Secondly, the vibration signals in the time domain are separated to obtain the vibration modes of the system, and the transfer function of the system is identified. Finally, the control parameters are adjusted based on the identified model parameters, and the optimal control parameters are obtained to realize the active vibration suppression of the model. The method provided by the invention can adaptively adjust the control parameters according to the characteristics of different types of aircraft model systems, so as to realize rapid and effective suppression of the vibration of multiple types of models, with strong adaptability and high accuracy.

Description

technical field [0001] The invention belongs to the field of active vibration control of aircraft models, and relates to a model-adaptive vibration active suppression method. Background technique [0002] The wind tunnel model test of the aircraft is an important means to obtain its aerodynamic characteristics and reduce the technical risk and cost of its development. Usually, the aircraft model is fixed in the wind tunnel by means of tail support, so as to realize the measurement of the aerodynamic force of the model under different attitudes, and provide reliable data for solving the aerodynamic parameters of the aircraft. However, during the wind tunnel test, the rigidity of the model support system is weak. In addition, the model is affected by unsteady flow field pulsation at different attitudes, and the model produces irregular vibrations, which can easily lead to inaccurate aerodynamic measurement data. Especially in the wind tunnel test, the vibration of the model m...

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Problems solved by technology

This method can effectively reduce the low-frequency vibration generated by the excitation of the wind tunnel model, and has achieved a good suppression effect on the broadband random excitation. However, the device is supported by a roller screw structure, which is difficult for multi-type aircraft wind tunnel models.

[0004] At present, the active suppression method of model vibration based on piezoelectric ceramic actuators is mainly for structural design and control law design for a specific model. A single control law does not have the adaptability to multiple models, and cannot meet the frequent replacement of models in wind tunnel tests. needs

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