Numerical and Experimental Studies on Inclined Incidence Parametric Sound Propagation

Figure 7

The directivity of sound pressure at 4 m away from the sound source with aluminum plate. (a) The primary sound pressure f  =  95 kHz; (b) the primary sound pressure f  =  110 kHz; (c) the difference frequency sound pressure f  =  15 kHz; (d) the sum frequency sound pressure f  =  205 kHz.

(a)

(b)

(c)

(d)