An origami-based tunable Helmholtz resonator for noise control: introduction of the concept and preliminary results

International audienceA Helmholtz resonator is a passive acoustic device that enablesnoise reduction at a given frequency. This frequency is directlyrelated to the volume of the resonator and to the size of theneck that couples the resonator to the acoustic domain. In otherwords, controlling the volume of the cavity allows a real time tunabilityof the device, which means noise control at any desiredfrequency. To that end, we propose an Origami-based tunableHelmholtz resonator. The design is inspired from the well-knownorigami base, waterbomb. Such foldable structures offer a widerange of volume shifting which corresponds to a frequency shiftingin the application of interest. The foldability of the structureis first investigated. Then, a series of numerical simulations andexperimental tests were preformed are presented, in order to explorethe capabilities of this origami structures in acoustic control.A shift in the frequency domain of up to 197 Hz (131-328Hz) was achieved in an experimental testing using 3D printedrigid device