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Official Journal of the Japan Wood Research Society

Journal of Wood Science Cover Image

Table 1 Sound absorption coefficients of specimens

From: Effect of heat treatment temperature and time on sound absorption coefficient of Larix kaempferi wood

Temperature/time Frequency
250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz
Control 0.024 0.034 0.012 0.012 0.028
200 °C
 9 h 0.026 0.033 0.013 0.014 0.030
 12 h 0.025 0.034 0.014 0.017 0.031
 15 h 0.026 0.034 0.014 0.017 0.031
 18 h 0.027 0.036 0.015 0.020 0.032
220 °C
 9 h 0.027 0.034 0.012 0.019 0.031
 12 h 0.027 0.036 0.014 0.022 0.034
 15 h 0.028 0.037 0.015 0.025 0.035
 18 h 0.028 0.036 0.016 0.028 0.037
240 °C
 9 h 0.027 0.036 0.014 0.022 0.034
 12 h 0.028 0.036 0.016 0.026 0.039
 15 h 0.027 0.034 0.016 0.030 0.043
 18 h 0.028 0.036 0.017 0.035 0.045