低速风洞试验模型主动抑振系统设计与验证

The Design and Experimental Study on Active Vibration Control System for Low Speed Wind Tunnel Test Model

开展飞行器风洞试验时,通常会出现模型振动情况,飞行器模型的振动会降低试验测量结果的精准度,在临界迎角状态时尤为严重,有时甚至会危害试验模型和设备的安全。为了提高试验质量,保障试验安全,应采取措施控制风洞试验中模型的振动,主动减振技术相较于被动减振技术适应性更强,可以满足风洞工况多变情况下模型减振需要。本文研究一套适用于低速风洞尾撑试验的基于压电陶瓷的主动减振系统,通过在支杆根部合理布置压电陶瓷作动器,将压电陶瓷的轴向运动转变成支杆的俯仰振动,以模型上振动加速度信号作为反馈,采用自适应内模反馈系统进行振动控制,并搭建地面模拟台进行了验证,试验结果表明本系统取得了良好的抑振效果。

The model vibration has great impact on the accuracy of wind tunnel test result and it also harms to the safety, especially, under the state of high attack angle. So it is necessary to take steps to control the vibration. Traditional passive vibration control method sometimes cannot meet the demand of adapting to different working conditions, while active vibration control is an attractive alternative solution. An active vibration control system for a long cantilever beam is described in this paper. Piezoelectric ceramic actuators are configured in such a way to convert the axial vibration they generate to pitch vibration of the end of the cantilever beam. Then taking the acceleration of vibration or the balance signal as the feedback, it achieves the vibration control through an adaptive feedback control system. Experimental results showed that the system has a good effect on vibration restraining.