Abstract
High‐intensity sound sources, such as sirens, have received much attention in the recent past due to renewed interest in industrial applications of high‐intensity acoustics. As a result of the very high sound pressure levels required (155–165 dB), finite amplitude effects must be taken into account in the design of sound generators. A time domain solution of the second‐order nonlinear wave equation is used to predict the behavior of initially nonsinusoidal plane waves, and is compared with a frequency‐domain approach. Results for initially sinusoidal, rectangular, and inverse‐shock waves are presented. It is shown that the shock formation distance for an initially inverse shock wave is π times the shock formation distance for an initially sinusoidal wave, and that the wave distortion actually results in an amplification of the fundamental, thus increasing the efficiency of the sound generation process. The consequences of wave distortion on several practical high‐intensity sound sources is discussed.
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