Official Journal of the Japan Wood Research Society
Table 3 Estimations by the vibration method with additional mass for the large specimens
Specimen | Without M | With M (vibration method with additional mass) | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
W 0 (kg) | ρ 0 (kg/m3) | f 10(Hz) | E 0 (GPa) | f 1 (Hz) | Uncorrected | Corrected | |||||||
W (kg) | ρ (kg/m3) | E (GPa) | Ratio | W (kg) | ρ (kg/m3) | E (GPa) | Ratio | ||||||
Microphone placement 2, y-axis: T-direction, concentrated mass placement 1, tapping 1, refer to Fig. 2 | |||||||||||||
No.1 | 7.132 | 431 | 253.7500 | 12.04 | 233.5313 | 6.546 | 395 | 11.05 | 0.92 | 6.326 | 382 | 10.68 | 0.89 |
No.2 | 6.592 | 399 | 252.5938 | 11.10 | 229.9688 | 5.580 | 338 | 9.40 | 0.85 | 5.387 | 326 | 9.07 | 0.82 |
No.3 | 7.216 | 409 | 220.6563 | 11.17 | 205.5313 | 7.966 | 451 | 12.34 | 1.10 | 7.721 | 437 | 11.96 | 1.07 |
No.4 | 6.102 | 383 | 231.5750 | 9.48 | 211.7750 | 5.950 | 374 | 9.24 | 0.98 | 5.747 | 361 | 8.93 | 0.94 |
No.5 | 6.987 | 403 | 218.6500 | 11.04 | 202.7500 | 7.383 | 426 | 11.67 | 1.06 | 7.154 | 413 | 11.31 | 1.02 |
Microphone placement 2, y-axis: T-direction, concentrated mass placement 2, tapping 1, refer to Fig. 2 | |||||||||||||
No.1 | 7.132 | 431 | 253.7500 | 12.04 | 236.8750 | 8.280 | 500 | 13.97 | 1.16 | 6.341 | 383 | 10.70 | 0.89 |
No.2 | 6.592 | 399 | 252.5938 | 11.10 | 233.2188 | 6.887 | 417 | 11.60 | 1.04 | 5.235 | 317 | 8.82 | 0.79 |
No.3 | 7.216 | 409 | 220.6563 | 11.17 | 207.4375 | 9.433 | 534 | 14.61 | 1.31 | 7.384 | 418 | 11.43 | 1.02 |
No.4 | 6.102 | 383 | 231.5750 | 9.48 | 214.4500 | 7.225 | 454 | 11.22 | 1.18 | 5.503 | 346 | 8.55 | 0.90 |
No.5 | 6.987 | 403 | 218.6500 | 11.04 | 204.5000 | 8.569 | 495 | 13.55 | 1.23 | 6.688 | 386 | 10.57 | 0.96 |
Microphone placement 2, y-axis: R-direction, concentrated mass placement 1, tapping 1, refer to Fig. 2 | |||||||||||||
No.1 | 7.132 | 431 | 255.0000 | 12.17 | 237.1875 | 7.776 | 470 | 13.27 | 1.09 | 7.521 | 454 | 12.83 | 1.05 |
No.2 | 6.592 | 399 | 245.5938 | 10.45 | 224.1563 | 5.783 | 350 | 9.17 | 0.88 | 5.585 | 338 | 8.85 | 0.85 |
No.3 | 7.216 | 409 | 222.7200 | 11.38 | 207.2400 | 7.826 | 443 | 12.35 | 1.08 | 7.585 | 430 | 11.97 | 1.05 |
No.4 | 6.102 | 383 | 236.0250 | 9.44 | 217.5000 | 6.679 | 420 | 10.33 | 1.09 | 6.455 | 406 | 9.99 | 1.06 |
No.5 | 6.987 | 403 | 220.0000 | 11.15 | 203.7500 | 7.234 | 418 | 11.55 | 1.04 | 7.010 | 405 | 11.19 | 1.00 |
Microphone placement 2, y-axis: R-direction, concentrated mass placement 2, tapping 1, refer to Fig. 2 | |||||||||||||
No.1 | 7.132 | 431 | 255.0000 | 12.17 | 238.1250 | 8.332 | 503 | 14.21 | 1.17 | 6.382 | 386 | 10.89 | 0.89 |
No.2 | 6.592 | 399 | 245.5938 | 10.45 | 228.0313 | 7.547 | 457 | 11.96 | 1.14 | 5.758 | 349 | 9.13 | 0.87 |
No.3 | 7.216 | 409 | 222.7200 | 11.38 | 208.8000 | 8.951 | 507 | 14.12 | 1.24 | 6.995 | 396 | 11.03 | 0.97 |
No.4 | 6.102 | 383 | 236.0250 | 9.44 | 219.1750 | 7.563 | 475 | 11.70 | 1.24 | 5.771 | 363 | 8.93 | 0.95 |
No.5 | 6.987 | 403 | 220.0000 | 11.15 | 205.7500 | 8.560 | 494 | 13.66 | 1.23 | 6.679 | 386 | 10.66 | 0.96 |
Average (standard deviation) of 20 data | 1.10 (0.12) | 0.95 (0.081) | |||||||||||