Table 12.
Statistical analysis of the influence of natural variability of spruce wood on attenuation expressed by measured velocity, signal amplitude and frequency in the L axis. Specimens – cubes-in air dried conditions [47].
| Statistical parameters | Density | Parameters of the ultrasonic P wave on spruce |
||
|---|---|---|---|---|
| Velocity VLL | Amplitude | Frequency | ||
| .kg/m3 | (m/s) | (dB) | (kHz) | |
| Minimum | 345 | 5512 | 22.5 | 628 |
| Maximum | 600 | 6694 | 59.7 | 980 |
| Average | 493 | 6209 | 47.0 | 854 |
| Coeff. of variation (%) | 11 | 4 | 19 | 8 |
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