| 模态分析在板材不同位置孔洞缺陷检测中的应用 |
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| 引用本文： | 徐华东,王立海,倪松远.模态分析在板材不同位置孔洞缺陷检测中的应用[J].林业机械与木工设备,2007,35(11):47-49. |
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| 作者姓名： | 徐华东 王立海 倪松远 |
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| 作者单位： | 东北林业大学工程技术学院,黑龙江,哈尔滨,150040 |
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| 基金项目： | 引进国际先进农业科技计划(948计划)，国家自然科学基金，教育部高等学校博士学科点专项科研基金 |
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| 摘 要： | 采用模态分析技术对落叶松板材试件进行振动测试,获取了试件的频响函数,并运用单模态法对频响函数进行了参数辨识,得到了试件的前四阶固有频率和前三阶模态振型.研究表明,含有孔洞试件的固有频率与标准试件相比略低一些,但差别不大.试件在含有孔洞的节点处模态振型会发生突变,因而可运用模态分析技术判定孔洞在试件上的具体位置,对板材孔洞缺陷进行定量检测.
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| 关 键 词： | 模态分析 板材 孔洞 检测 |
| 文章编号： | 1001-4462（2007）11-0047-03 |
| 修稿时间： | 2007-06-15 |
The Application of Modal Analysis in NDT of hole-defect in Lumber |
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| XU Hua-dong,WANG Li-hai,NI Song-yuan.The Application of Modal Analysis in NDT of hole-defect in Lumber[J].Forestry Machinery & Woodworking Equipment,2007,35(11):47-49. |
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| Authors: | XU Hua-dong WANG Li-hai NI Song-yuan |
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| Institution: | Engineering Technology College, Northeast Forestry University, Heiiongjiang Harbin 150040, China |
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| Abstract: | Larch lumbers were tested by using modal analysis technology and frequency response functions(FRF) were derived.Modal parameters,including first 4 intrinsic frequency and first 3 modal shape,were distinguished by single modal method.Research shows that the intrinsic frequency of hole-defect lumbers is little lower than standard lumbers.The modal shape of the node near the hole-defect always jumps abruptly,so it can estimate the particular position of hole-defect in the lumber by using modal analysis technology. |
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| Keywords: | modal analysis lumber hole-defect testing |
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