1.西南林业大学机械与交通学院,云南昆明 650224
2.安徽工程大学,高端装备先进感知与智能控制教育部重点实验室,安徽芜湖 241000
3.安徽工程大学电气工程学院,安徽芜湖 241000
扫 描 看 全 文
丁锐,方赛银,罗蕊寒等.基于声发射的樟子松锯材表面横波与内部纵波传播特性及能量衰减规律[J].木材科学与技术,2022,36(01):36-42.
DING Rui,FANG Sai-yin,LUO Rui-han,et al.Propagation Characteristics and Energy Attenuation Law of Surface Shear Waves and Internal Longitudinal Waves in Mongolian Scotch Pine Sawn Timber Based on Acoustic Emission[J].Chinese Journal of Wood Science and Technology,2022,36(01):36-42.
为研究不同声发射（acoustic emission，AE）模态的传播特性与能量衰减模式，依据波动理论提出一种木材AE信号表面横波与内部纵波析取方法，进而建立AE信号能量衰减模型。首先，依据ASTM-E976-2015通过铅芯折断的方式在樟子松锯材表面产生AE源，并在不同位置采集表面横波与内部纵波的AE原始信号，采样频率设置为500 kHz；然后，采用小波分析方法从原始信号中重构AE波形，分析木材AE信号表面横波与内部纵波的传播特性；最后，通过指数函数拟合的方法，构建表面横波与内部纵波能量衰减模型。结果表明：表面横波与内部纵波在樟子松锯材中传播时AE能量均呈明显的指数衰减规律，但在频率分布和传播速率上均有较大差异。表面横波在传播初始阶段主要分布在以80.0 kHz和113.3 kHz为中心的两个中高频段内，随着其在木材表面的传播，高频信号迅速衰减为低频信号。而内部纵波始终处于相对低频段内，其平均传播速率约为表面横波的4.6倍。
In order to study the propagation characteristics and energy attenuation modes of different acoustic emission (AE) modes, a method for extracting surface shear waves and internal longitudinal waves of wood AE signals was proposed based on the wave theory. The AE signal energy attenuation model was established. First, according to the ASTM-E976-2015, the AE source was generated on the surface of the sawn timber of ,Pinus sylvestris ,var., mongolica ,Litv. by breaking the lead core, and the AE raw signals of the surface transverse wave and the internal longitudinal wave were collected at different positions with the sampling frequency of 500 kHz. Then, the wavelet analysis method was used to reconstruct the AE wave-form from the original signal; the propagation characteristics of the surface shear wave and the internal longitudinal wave of the wood AE signal were investigated. Finally, an exponential function fitting method was used to construct the energy attenuation model of surface shear waves and internal longitudinal waves. The results showed that the AE energy of both the surface transverse wave and the internal longitudinal wave exhibited a significant exponential decay law when propagating in the wood; there were big differences in frequency distribution and propagation rate. In the initial stage of propagation, the surface transverse wave was mainly distributed in the two middle and high frequency bands centered at 80.0 kHz and 113.3 kHz. As it propagated on the surface of the wood, the high-frequency signal quickly attenuated to the low-frequency signal. The internal longitudinal wave was always in a relatively low frequency band, and its average propagation velocity was about 4.6 times that of the surface transverse wave.
声发射樟子松锯材表面横波内部纵波小波分析能量衰减模型
acoustic emissionPinus sylvestris var. mongolica Litv. sawn timbersurface transverse waveinternal longitudinal wavewavelet analysisenergy attenuation model
Baensch F, Zauner M, Sanabria S J, et al. Damage evolution in wood: synchrotron radiation micro-computed tomography (SRμCT) as a complementary tool for interpreting acoustic emission (AE) behavior[J]. Holzforschung, 2015, 69(8): 1015-1025.
申珂楠, 赵海龙, 丁馨曾, 等. 声发射技术在木材加工领域的应用[J]. 世界林业研究, 2015, 28(1): 56-60.
SHEN K N, ZHAO H L, DING X Z, et al. Application of acoustic emission in wood processing[J]. World Forestry Research, 2015, 28(1): 56-60.
ZHAO J H, SHI Y K, SHAN N, et al. Stabilized fiber-optic extrinsic Fabry-Perot sensor system for acoustic emission measurement[J]. Optics & Laser Technology, 2008, 40(6): 874-880.
Satour A, Montrésor S, Bentahar M, et al. Acoustic emission signal denoising to improve damage analysis in glass fibre-reinforced composites[J]. Nondestructive Testing and Evaluation, 2014, 29(1): 65-79.
Diakhate M, Bastidas-Arteaga E, Moutou Pitti R, et al. Cluster analysis of acoustic emission activity within wood material: towards a real-time monitoring of crack tip propagation[J]. Engineering Fracture Mechanics, 2017, 180: 254-267.
Bucur V, Declercq N F. The anisotropy of biological composites studied with ultrasonic technique[J]. Ultrasonics, 2006, 44(Suppl 1): e829-e831.
LI X C, JU S, LUO T F, et al. Effect of moisture content on propagation characteristics of acoustic emission signal of Pinus massoniana Lamb.[J]. European Journal of Wood and Wood Products, 2020, 78(1): 185-191.
WU Y, SHAO Z, WANG F, et al. Acoustic emission characteristics and felicity effect of wood fracture perpendicular to the grain[J]. Journal of Tropical Forest Science, 2014, 26(4): 522-531.
孙建平, 王逢瑚, 朱晓东, 等. 动态载荷下基于声发射技术的杨木破坏过程检测[J]. 林业科学, 2006, 42(9): 89-92.
SUN J P, WANG F H, ZHU X D, et al. Testing damage process of David poplar under the dynamic loads based on acoustic emission technique[J]. Scientia Silvae Sinicae, 2006, 42(9): 89-92.
孙建平, 王逢瑚, 胡英成. 基于声发射和神经网络的木材受力损伤过程检测[J]. 仪器仪表学报, 2011, 32(2): 342-347.
SUN J P, WANG F H, HU Y C. Damage process testing of wood under loads based on acoustic emission and neural network[J]. Chinese Journal of Scientific Instrument, 2011, 32(2): 342-347.
鞠双, 李新慈, 罗廷芳, 等. 马尾松胶合木表面声发射信号各向异性传播规律[J]. 林业工程学报, 2019, 4(2): 48-53.
JU S, LI X C, LUO T F, et al. Anisotropic propagation of acoustic emission signal on surface of Pinus massoniana Lamb. glulam[J]. Journal of Forestry Engineering, 2019, 4(2): 48-53.
鞠双, 李明, 罗廷芳, 等. 依据瞬时频率的木材损伤过程声发射信号辨识[J]. 东北林业大学学报, 2020, 48(2): 87-92.
JU S, LI M, LUO T F, et al. Acoustic emission signal identification of wood damage process with instantaneous frequency[J]. Journal of Northeast Forestry University, 2020, 48(2): 87-92.
李杨, 罗廷芳, 于帅帅, 等. 花旗松胶合木梁声发射信号及其传播特征研究[J]. 西北林学院学报, 2017, 32(5): 197-201, 251.
LI Y, LUO T F, YU S S, et al. Signal propagation characteristics of acoustic emission and Douglas fir glulam beams[J]. Journal of Northwest Forestry University, 2017, 32(5): 197-201, 251.
王明华, 邓婷婷, 鞠双, 等. 木材表面裂纹对声发射信号传播特性的影响[J]. 东北林业大学学报, 2020, 48(10): 82-88.
WANG M H, DENG T T, JU S, et al. Effect of wood surface crack on acoustic emission signal propagation characteristics[J]. Journal of Northeast Forestry University, 2020, 48(10): 82-88.
申珂楠, 丁馨曾, 赵海龙, 等. 木材表面声发射信号源的三角形定位方法[J]. 东北林业大学学报, 2015, 43(4): 77-81, 112.
SHEN K N, DING X Z, ZHAO H L, et al. Acoustic emission signal source localization in wood surface with triangle positioning method[J]. Journal of Northeast Forestry University, 2015, 43(4): 77-81, 112.
李晓崧, 邓婷婷, 王明华, 等. 基于小波与相关性分析的木材声发射源直线定位算法改进[J]. 林业工程学报, 2020, 5(3): 138-143.
LI X S, DENG T T, WANG M H, et al. Linear positioning algorithm improvement of wood acoustic emission source based on wavelet and signal correlation analysis methods[J]. Journal of Forestry Engineering, 2020, 5(3): 138-143.
鞠双, 李新慈, 罗廷芳, 等. 应用小波分析法对马尾松胶合木表面声发射信号特征检测[J]. 东北林业大学学报, 2018, 46(8): 84-90.
JU S, LI X C, LUO T F, et al. Characteristics of acoustic emission signals on the surface of Masson pine gulam with wavelet analysis method[J]. Journal of Northeast Forestry University, 2018, 46(8): 84-90.
王观石, 李长洪, 胡世丽, 等. 岩体中应力波幅值随时空衰减的关系[J]. 岩土力学, 2010, 31(11): 3487-3492.
WANG G S, LI C H, HU S L, et al. A study of time-and spatial-attenuation of stress wave amplitude in rock mass[J]. Rock and Soil Mechanics, 2010, 31(11): 3487-3492.
京公网安备11010802024621
微信公众号