Acoustic Properties of Resonators Using Deployable Cylinders
In this study, deployable cylinders with bellows-like patterns are used to change the neck length of Helmholtz resonator. The cylinders are quasi-rigid foldable and constructed by assembling flat, rigid quadrilateral plates. Acoustic computation revealed that the proposed resonator with a deployable neck worked effectively to attenuate noise at a resonant frequency. Furthermore, we discuss that the proposed resonator was able to cover low frequency range, because the neck length changed reciprocally to the cross-sectional area and the resonant frequency reached zero in theory according to the geometrical configuration of the cylinder.
KeywordsAcoustic analysis Helmholtz resonator Noise reduction Frequency characteristic Deployable structures Origami
- 3.Cheng, C.R., McIntosh, J.D., Zuroski, M.T., Eriksson, L.J.: Tunable acoustic system. United States Patent 5, 930, 371 (1999)Google Scholar
- 4.Kozukue, W., Morimura, H., Hagiwara, I., Miyaji, H.: Experiment on noise reduction by Helmholtz resonator with variable throat. In: Proceedings of Dynamics and Design Conference 2008, No. 08-14. Japan Society of Mechanical Engineers, Japan (2008). (in Japanese)Google Scholar
- 5.Nojima, T., Hagiwara, I. (eds.): Geometrical Mathematics for Origami and Its Industrial Application, 1st edn. Kyoritsu Shuppan, Japan (2012). (in Japanese)Google Scholar
- 6.Fahy, F.: Engineering Acoustics, 1st edn. Elsevier, UK (2001)Google Scholar