Groupe d'Acoustique de l'Université de Sherbrooke, Département de génie mécanique, Université de Sherbrooke, Sherbrooke, Quebec J1K 2R1, Canada.
J Acoust Soc Am. 2011 Feb;129(2):726-40. doi: 10.1121/1.3519676.
Smart foams combine the complimentary advantages of passive foam material and spatially distributed piezoelectric actuator embedded in it for active noise control applications. In this paper, the problem of improving the transmission loss of smart foams using active control strategies has been investigated both numerically and experimentally inside a waveguide under the condition of plane wave propagation. The finite element simulation of a coupled noise control system has been undertaken with three different smart foam designs and their effectiveness in cancelling the transmitted wave downstream of the smart foam have been studied. The simulation results provide insight into the physical phenomenon of active noise cancellation and explain the impact of the smart foam designs on the optimal active control results. Experimental studies aimed at implementing the real-time control for transmission loss optimization have been performed using the classical single input/single output filtered-reference least mean squares algorithm. The active control results with broadband and single frequency primary source inputs demonstrate a good improvement in the transmission loss of the smart foams. The study gives a comparative description of the transmission and absorption control problems in light of the modification of the vibration response of the piezoelectric actuator under active control.
智能泡沫结合了被动泡沫材料和空间分布的压电执行器的互补优势，用于主动噪声控制应用。在本文中，在平面波传播条件下，在波导内对使用主动控制策略提高智能泡沫的传输损耗的问题进行了数值和实验研究。采用三种不同的智能泡沫设计对耦合噪声控制系统进行了有限元模拟，并研究了它们在消除智能泡沫下游传输波方面的有效性。模拟结果深入了解了主动噪声消除的物理现象，并解释了智能泡沫设计对最佳主动控制结果的影响。为了实现传输损耗优化的实时控制，使用经典的单输入/单输出滤波参考最小均方算法进行了实验研究。宽带和单频原始源输入的主动控制结果表明，智能泡沫的传输损耗得到了很好的改善。研究根据主动控制下压电执行器的振动响应的改变，对传输和吸收控制问题进行了比较描述。
