| Autor: |
Xiu-fen, Gong, Gong-huan, Du, Zhe-min, Zhu |
| Zdroj: |
Journal of the Acoustical Society of America; 1979, Vol. 65 Issue S1, pS96-S96, 1p |
| Abstrakt: |
When a finite amplitude wave of frequency f1 and a weak signal wave of frequency f2 propagate collinearly, an amplitude suppression of the weak waves occurs thru the nonlinear interaction, the energy of suppression is transferred to the production of the sideband components with frequency f2 as a center. The above mentioned theoretical prediction has been experimentally proved in our laboratory. In order to study the interaction for plane progressive wave we used a 9-m long iron tube with square section 4 × 4 cm2 and an absorbing termination. The conditions used in our experiment were:f1 = 980 c/s, SPL1 = 130-150 dB;f2 = 4000 c/s. SPL2 < 100 dB, where SPL, is sound pressure of finite amplitude wave f1, and SPL2 that of weak signal f2. The experiment was performed in the preshock region. In the experiment, it was found that maximum suppression of weak signal was 43 dB as SPL1 = 147 dB, and the sideband components with frequency f2 as center occurred simultaneously, but with nonsymmetrical amplitude distribution. Experimental details will be described and discussed. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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