Misol Malte, Haase Thomas, Monner Hans Peter, Sinapius Michael
German Aerospace Center (DLR), Institute of Composite Structures and Adaptive Systems, Braunschweig, Germany.
Technical University Braunschweig, Institute of Adaptronics and Functional Integration, Braunschweig, Germany.
J Acoust Soc Am. 2014 Oct;136(4):1610-8. doi: 10.1121/1.4895710.
This paper provides experimental results of an aircraft-relevant double panel structure mounted in a sound transmission loss facility. The primary structure of the double panel system is excited either by a stochastic point force or by a diffuse sound field synthesized in the reverberation room of the transmission loss facility. The secondary structure, which is connected to the frames of the primary structure, is augmented by actuators and sensors implementing an active feedforward control system. Special emphasis is placed on the causality of the active feedforward control system and its implications on the disturbance rejection at the error sensors. The coherence of the sensor signals is analyzed for the two different disturbance excitations. Experimental results are presented regarding the causality, coherence, and disturbance rejection of the active feedforward control system. Furthermore, the sound transmission loss of the double panel system is evaluated for different configurations of the active system. A principal result of this work is the evidence that it is possible to strongly influence the transmission of stochastic disturbance sources through double panel configurations by means of an active feedforward control system.
本文给出了安装在传声损失实验装置中的飞机相关双面板结构的实验结果。双面板系统的主结构由随机点力或在传声损失实验装置的混响室中合成的扩散声场激励。与主结构框架相连的次结构通过执行器和传感器进行增强，以实现有源前馈控制系统。特别强调了有源前馈控制系统的因果性及其对误差传感器处干扰抑制的影响。针对两种不同的干扰激励，分析了传感器信号的相干性。给出了关于有源前馈控制系统的因果性、相干性和干扰抑制的实验结果。此外，还针对有源系统的不同配置评估了双面板系统的传声损失。这项工作的一个主要成果是证明了通过有源前馈控制系统可以通过双面板配置强烈影响随机干扰源的传播。
