Next Article in Journal
Influence of Earthquake Rotational Components on the Seismic Safety of Steel Structures
Previous Article in Journal
Study on Dynamic Interaction of Railway Pantograph–Catenary Including Reattachment Momentum Impact
Open AccessArticle

Effect of Incident Acoustic Pressure Amplitude on the Transmission Loss of Helmholtz Resonators

1
Fluid-Structure Interaction Laboratory, Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, Oshawa, ON M5S 2E8, Canada
2
School of Engineering, University of Guelph, Guelph, ON N1G 2W1, Canada
*
Author to whom correspondence should be addressed.
Vibration 2020, 3(1), 34-41; https://doi.org/10.3390/vibration3010004
Received: 8 January 2020 / Revised: 10 February 2020 / Accepted: 17 February 2020 / Published: 21 February 2020
Acoustic transmission loss is a common parameter utilized throughout several studies to evaluate the acoustic characteristics of a given test element. Transmission loss has been frequently referred to as a source independent parameter. However, this work presents evidence that the incident acoustic pressure amplitude does, in fact, have an effect on the measured transmission loss for some passive damping devices. The transmission loss was experimentally measured utilizing the two-source location method and the specimens tested include an expansion chamber, a quarter wave resonator, a Herschel–Quincke tube and various Helmholtz resonators. When varying the power supplied to the acoustic source, it was noted that all the devices exhibited nearly constant values of transmission loss, with the exception of the Helmholtz resonators. The Helmholtz resonators had a significant variance of transmission loss with respect to the acoustic source power. This decrease in performance is caused by the “jet-flow” phenomenon occurring at the Helmholtz resonator neck, which results in increased acoustic losses. The present work illustrates that the assumption of source independence, which is often made when using transmission loss to evaluate damping devices, must be taken with caution, as this assumption is case dependent and may be crucial when scaling experimental studies to an industrial setting. View Full-Text
Keywords: transmission loss; Helmholtz resonator; pressure amplitude; noise control transmission loss; Helmholtz resonator; pressure amplitude; noise control
Show Figures

Figure 1

MDPI and ACS Style

Sachedina, K.; Lato, T.; Mohany, A.; Hassan, M. Effect of Incident Acoustic Pressure Amplitude on the Transmission Loss of Helmholtz Resonators. Vibration 2020, 3, 34-41.

Show more citation formats Show less citations formats

Article Access Map by Country/Region

1
Back to TopTop