An origami-based tunable Helmholtz resonator for noise control: introduction of the concept and preliminary results
Résumé
A Helmholtz resonator is a passive acoustic device that enables
noise reduction at a given frequency. This frequency is directly
related to the volume of the resonator and to the size of the
neck that couples the resonator to the acoustic domain. In other
words, controlling the volume of the cavity allows a real time tunability
of the device, which means noise control at any desired
frequency. To that end, we propose an Origami-based tunable
Helmholtz resonator. The design is inspired from the well-known
origami base, waterbomb. Such foldable structures offer a wide
range of volume shifting which corresponds to a frequency shifting
in the application of interest. The foldability of the structure
is first investigated. Then, a series of numerical simulations and
experimental tests were preformed are presented, in order to explore
the capabilities of this origami structures in acoustic control.
A shift in the frequency domain of up to 197 Hz (131-328
Hz) was achieved in an experimental testing using 3D printed
rigid devices