Compliant-Backplate Helmholtz Resonators for Active Noise Control Applications

The results of a theoretical and experimental investigation into compliant-backplate Helmholtz resonators are presented. The motivation for this study is to develop an actively tuned noise control system, based upon a Helmholtz resonator that uses a compliant piezoelectric composite backplate. To establish a baseline case, rigid backplate Helmholtz resonators were designed using a lumped element model and tested in a plane-wave tube. After this initial testing, the rigid backplate of the resonator was replaced by several compliant aluminum diaphragms and characterized. The experimental results are compared to lumped element models of the Helmholtz resonator with a compliant diaphragm.