Research On Active Vibro-Acoustic Control For A Composite Stiffened Panel Using Hybrid Control Strategy

It is an important target of modern aviation industry to increase the riding comfortability of civil airliners, and noise reduction is especially the focus of research. The traditional ways of passive noise reduction usually have poor performance in low frequency section of their own inherent limitation. However, active control of sound transmission has overcome the passive approach’s shortcomings by its well low-frequency control effect, light weight and high adaptability, with great prospect and research value.Based on developed theory of active vibro-acoustic control and domestic and international study results, this thesis shows a theoretical and experimental research on hybrid control strategy with a composite aircraft stiffened panel as subject.Vibration characteristics research of the composite panel is firstly made using impact method. With piezoelectric smart materials as sensors and actuators, experiment system is established. Based on the active structural acoustic control(i.e. active vibro-acoustic control) technology, some classic single algorithms are implemented. Furthermore, the accuracy of system identification for secondary path in high-authority control strategy is discussed. By comparative studying on different high-authority and low-authority strategies, the experimental results indicate the optimal hybrid control strategy. And another control experiment is made to validate the control results.