| 基于振动模态分析的落叶松节子定位的无损检测 |
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| 引用本文： | 朱晓冬,曹军,王逢瑚,孙建平.基于振动模态分析的落叶松节子定位的无损检测[J].林业科学,2009,45(5). |
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| 作者姓名： | 朱晓冬 曹军 王逢瑚 孙建平 |
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| 作者单位： | 东北林业大学生物质材料科学与技术教育部重点实验室,哈尔滨,150040 |
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| 摘 要： | 木材作为结构材使用时,节子的存在影响木材的强度,降低了木材的利用价值.为了节约木材,提高木材的使用率,人们一直在研究木材缺陷无损检测的方法.Beall(2000)首次使用表面传感器研究人造板的力学性能和内部缺陷,收到良好效果.日本学者小玉泰羲(2000)用连续小波变换分析处理利用敲击木材所获得的声信号,对气干木材的节子缺陷进行检测,研究发现,当木材含有节子缺陷时,声信号的共振频率降低、声信号共振的持续时间缩短.
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| 关 键 词： | 模态分析 无损检测 小波包分析 共振频率 |
Location Nondestructive Testing of Knot of Larch Lumber with Vibration Modal Analysis |
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| Zhu Xiaodong,Cao Jun,Wang Fenghu,Sun Jianping.Location Nondestructive Testing of Knot of Larch Lumber with Vibration Modal Analysis[J].Scientia Silvae Sinicae,2009,45(5). |
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| Authors: | Zhu Xiaodong Cao Jun Wang Fenghu Sun Jianping |
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| Institution: | Key Laboratory of Bio-Based Material Science and Technology of Ministry of Education;Northeast Forestry University Harbin 150040 |
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| Abstract: | The effects of the occurrence and position of knots on modal parameter of Larix gmelinii was studied in this paper. The vibration signals are decomposed by wavelet package. The main results are as follows:the component of high frequency of sample with knot was higher than that of sample without knot. With knots at different position,the component of high frequency of sample with knots at left is the maximum and that of sample with knots at right is the minimum. The knots of samples can be nondestructively t... |
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| Keywords: | modal analysis nondestructive test wavelet package analysis resonance frequency |
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