Development of non-destructive method for water content and internal defect of trees with an acoustic vibration technique

利用声振动技术开发树木含水量和内部缺陷的无损检测方法

• 批准号: 19380021
• 负责人: SAKURAI Naoki
• 金额: $ 13.15万
• 依托单位: Hiroshima University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2007
• 资助国家: 日本
• 起止时间: 2007 至 2009
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19380021/
• 关键词: 樹木; 振動; 共振; フーリエ解析; 水分含量; 内部欠陥; 非破壊検査; ヤング率; 非破壞検査; 音響振動; 音速; 水分; 木材; 高速フーリエ解析; 共鳴; 非破壊; 非侵襲

We developed a new vibration technique and device that acquires internal information within the living tree. This device could determine the second and third resonant peak of the trunk. The sound velocity is known to be positively related with Young's modulus and negatively with density, suggesting that it reflects the internal water condition in the trunk. The measured velocity was high in winter and low in summer, suggesting that the water content in the summer is higher than in the winter. The velocity was also high before rain and low after rain, also suggesting that the velocity reflects the internal water condition in the trunk. When the ratio of the frequency of third to that of second was measured using a log without any defect, the ratio is almost 1.5 at every point, while those of defected log with cavity or node were below or over 1.5. It demonstrates that vibration technique evaluate the internal quality of the trunk such as water content and detects.

我们开发了一种新的振动技术和设备，可以获取活树内部的信息。该装置可以确定躯干的第二和第三共振峰。声速与杨氏模量呈正相关，与密度呈负相关，这表明声速反映了树干内部的水分状况。实测流速冬季高，夏季低，表明夏季含水量高于冬季。降雨前流速高，降雨后流速低，这也表明流速反映了树干内部的水分状况。用无缺陷的原木测得的三次频率与二次频率之比在各点上接近1.5，而有缺陷的原木测得的三次频率与二次频率之比在各点上均小于或大于1.5。结果表明，振动检测技术可以有效地评价汽车后备箱的内部质量，如含水量、缺陷等。

项目成果

振動共振法を用いた共振ピークと音速による立木の内部欠陥検出法の開発

利用振动共振法开发基于共振峰和声速的立木内部缺陷检测方法

• 发表时间: 2010
• 作者: Kong F;Oyanagi A;Komatsu S;小久保亮・櫻井直樹
• 通讯作者: 小久保亮・櫻井直樹

共振周波数(農産物性と計測方法, 西津, 後藤, 近藤, 林, 清水編著者)

共振频率（农产品特性和测量方法，西津、后藤、近藤、林、清水编辑）

• 作者: 谷脇満;櫻井直樹
• 通讯作者: 櫻井直樹

振動検出素子とそれを用いた振動検出装置と振動検出方法

振动检测元件、使用该振动检测元件的振动检测装置以及振动检测方法

• 发表时间: 2008

Cooking kinetics of potato tubers determined by vibration techniques

通过振动技术测定马铃薯块茎的蒸煮动力学

• 发表时间: 2007
• 期刊: Food Research International 40
• 作者: Blahovec;J. S. Kuroki;N. Sakurai
• 通讯作者: N. Sakurai

Non-destructive determination of the optimum eating ripeness of pears and their texture measurements using acoustical vibration technique.

使用声学振动技术无损测定梨的最佳食用成熟度及其质地测量。

• 发表时间: 2008
• 期刊: Postharvest Biology & Technology 51
• 作者: Taniwaki;M.;T. Hanada;M. Tohro;N. Sakurai
• 通讯作者: N. Sakurai