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If e > eO, then we are in the region of specular reflection. When e < eO, then diffraction attenuation must be considered. Rindel (1986) gives

4 4eo o

Figure 7.8 compares these approximate values to those obtained from a more detailed analysis.

Rindel (1986) also cites results of measurements carried out in an anechoic chamber using gated impulses, which are reproduced in Fig. 7.9. He concludes that for values of

Figure 7.8 Calculated Values of K (Rindel, 1986)

Values are given as a function of the distance from the edge to the geometric point of reflection

Figure 7.8 Calculated Values of K (Rindel, 1986)

Values are given as a function of the distance from the edge to the geometric point of reflection

Figure 7.9 Measured and Calculated Attenuation of a Sound Reflection from a Square Surface (Rindel, 1986)

Reflection from the center of a O& x O& m plate a = 6 m, a = 4m,0 = feO 0

Figure 7.9 Measured and Calculated Attenuation of a Sound Reflection from a Square Surface (Rindel, 1986)

Reflection from the center of a O& x O& m plate a = 6 m, a = 4m,0 = feO 0

O 5 kHz lO kHz

0 0

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