Free Oscillations of Acoustical Resonators and Pressure Effects on Damping and Amplification
作者:
Robert W. Troke,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1969)
卷期:
Volume 46,
issue 4A
页码: 835-839
ISSN:0001-4966
年代: 1969
DOI:10.1121/1.1911781
出版商: Acoustical Society of America
数据来源: AIP
摘要:
The effects of sound‐pressure amplitude and static pressure are studied, primarily from experimental text results. Oscillograph records of the transient response of both Helmholtz and pipe resonators are analyzed to determine the damping, decay decrement, and relaxation time of the free oscillations. Damping is determined to be inversely proportional to the static pressure. Damping is found to be a function of amplitude and to decrease as the oscillating pressure amplitude decreases, although at a lesser rate. Since the pressure amplification at resonance is proportional to the reciprocal of the damping, very high amplifications are realized for systems with light damping and low pressure inputs. It is shown that seashells are pipe resonators that respond continuously in the audible range to inaudible inputs. Experimental data and theoretical analyses are used to make a plot of amplification at resonance versus input sound‐pressure level.
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