In:
The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 71, No. S1 ( 1982-04-01), p. S30-S30
Kurzfassung:
For collinear interaction of two sound waves (or of a single sound wave with itself) in a gas, the coefficient of nonlinearity is equal to one-half (γ + 1), where γ is the ratio of specific heats. For interaction at an angle θ it has been proposed that β = cos θ + one-half (γ − 1). A waveguide experiment to test this hypothesis has been designed. An intense wave of low frequency f1 travels down a rectangular waveguide (cross section a × b) in the plane wave (0,0) mode. Interacting with it is a weak wave of high frequency f2 that bounces along the guide in the (1,0) mode (angle θ = sin−1 c0/2af2). The experiment is thus a generalization of one done by Schaffer [J. Acoust. Soc. Am. Suppl. 1 57, S73 (1975)] to demonstrate the suppression of sound by sound. In our case, however, suppression is more complicated because the two waves travel at different speeds down the guide. A prediction of the null point for the high-frequency wave has been derived. Preliminary experimental results tentatively confirm the proposed β(θ) relation. [Work supported by ONR.]
Materialart:
Online-Ressource
ISSN:
0001-4966
,
1520-8524
Sprache:
Englisch
Verlag:
Acoustical Society of America (ASA)
Publikationsdatum:
1982
ZDB Id:
1461063-2
