文献类型：期刊文献

中文题名：含水率和温度对兴安落叶松木材声 ?超声参数的影响

英文题名：Effect of Moisture Content and Temperature on Acousto-Ultrasonic Parameters of Larix gmelinii Wood

作者：Xunya, Zhang[1] Huaqiang, Yu[2] Yafang, Yin[2] Xiaomei, Jiang[2]

第一作者：Xunya, Zhang

机构：[1] Fuyang Institute of Technology, Fuyang, 236031, China; [2] Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing, 100091, China

年份：2026

卷号：62

期号：1

起止页码：156-163

外文期刊名：Linye Kexue/Scientia Silvae Sinicae

收录：EI(收录号：20260720084316)

语种：中文

外文关键词：Acoustic wave velocity - Acoustics - Moisture - Moisture determination - Temperature - Timber - Ultrasonic testing - Uncertainty analysis - Wave propagation

摘要：【Objective】 This study aims to explore the influence of moisture content (MC) and temperature (T) on acousto-ultrasonic (AU) parameters of Larix gmelinii wood in order to provide theoretical basis and scientific basis for the application of acousto-ultrasonic nondestructive testing technology in wood research field. 【 Method】 Four acousto-ultrasonic parameters including wave velocity (V), amplitude voltage (A), root mean square voltage (RMS), frequency-centroid (FC) of small clear specimens of L. gmelinii were measured under four moisture content levels (6%, 12%, 24%, 85%) and four temperature levels (?20 ℃, 0 ℃, 20 ℃, 40 ℃). The significance of difference and changes of each AU parameter under different moisture content and temperature conditions were compared, the influence of moisture content and temperature on different acoustic-ultrasonic parameters of wood and the reasons were analyzed.【Result】 1) Moisture content and temperature had significant effects on each acousto-ultrasonic parameter of wave velocity, amplitude voltage, root mean square voltage and frequency centroid (P0.05) at the moisture content of 85%.【Conclusion】1）For saturated larch wood, the water freezing significantly enhances the propagation ability of ultrasonic wave at the temperature of ?20 ℃. The amplitude voltage, root mean square voltage and frequency-centroid at the temperature of ?20 ℃ increases significantly compared with the temperature of 0 ℃, 20 ℃ and 40 ℃, but the change of wave velocity is not significant. For larch wood below fiber saturation point, temperature has little effect on ultrasonic wave propagation in wood. 2) When the temperature is greater than or equal to 0 ℃, moisture content has a significant effect on the propagation velocity and energy attenuation of ultrasonic wave in wood due to the viscosity of water, and the wave velocity, amplitude voltage and root mean square voltage decrease with the increase of moisture content. The wave velocity also tends to decrease with the increase of moisture content at the temperature of ?20 ℃. However, the moisture content has no significant effect on the propagation energy of ultrasonic wave in wood due to the phase change of water, and the change amplitude of amplitude voltage and root mean square voltage is small. 3) When the temperature is above or equal to 0 ℃, the influence of moisture content on the frequency-centroid is very small if the moisture content of wood is lower than the fiber saturation point, while the frequency-centroid decreases significantly if the moisture content of wood is higher than the fiber saturation point, because a large amount of free water in the cell cavity leads to the attenuation of high-frequency components in the ultrasonic signal. Moisture content has no significant effect on frequency-centroid atthe temperature of ?20 ℃. ? 2026, Chinese Society of Forestry. All rights reserved.