Non-destructive investigation of a structure by vibration analysis

通过振动分析对结构进行无损研究

• 批准号: 08650475
• 负责人: ABE Masato
• 金额: $ 1.22万
• 依托单位: lwate University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650475/
• 关键词: Defect investigation; Structure; Surface wave; Beamforming; 音波検査; 音源検探査; 欠陥検出; 弾性体; 半埋設構造体; 非破壊検査; 振動; 表面波除去; ビームフォーミング

We have developed a method to estimate the position of defects of a structure by vibration analysis. We used a concrete block as the structure and the defect is modeled by a vinyl sheet with a thickness of 200 mum. An array of sensors is attached on the surface of the concrete block, and a vibration pulse is forced using a small hammer. Since the forced vibration reflects at the position of a crack, the position will be estimated by picking up the reflection wave with an array of sensor using a beamforming technique. Since the power of the surface wave is much greater than that of the necessary reflection wave from the defect, the position of the defect could not been estimated correctly. So, we have developed a method to eliminate the useless surface wave, and a better estimation was achieved. But this method requires the restriction that a crack should be parallel to the surface. To avoid this restriction, we newly assume that the forced vibration reflects at the position of a crack and spherical wave is radiated to the sensors. Some experiments were carried out, and good results were obtained in the case that crack was slanting to the surface of the block.

我们提出了一种通过振动分析来估计结构缺陷位置的方法。我们使用混凝土块作为结构，并用200毫米厚的乙烯基板来模拟缺陷。在混凝土块的表面安装了一组传感器，并用小锤施加振动脉冲。由于强迫振动反射在裂纹的位置，因此位置将通过使用波束形成技术的传感器阵列拾取反射波来估计。由于表面波的功率远远大于来自缺陷的必要反射波的功率，因此无法正确估计缺陷的位置。因此，我们提出了一种消除无用表面波的方法，得到了较好的估计结果。但这种方法需要一个约束，即裂纹必须平行于表面。为了避免这种限制，我们新的假设强迫振动在裂纹位置反射，球面波辐射到传感器。进行了一些试验，在裂缝向块体表面倾斜的情况下，取得了较好的效果。

项目成果

Yasunari Otawara, Naohiko Kubo, Miyuki Abe, Nobuhiko Tomitsuka, Akira Ogawa, Satoshi Hongo and Masato Abe: "Sonic analysis for detection of cervical and intercranial vascular disease" Neurologia medico-chirurgica. 37-6. 453-458 (1997)

Yasunari Otawara、Naohiko Kubo、Miyuki Abe、Nobuhiko Tomitsuka、Akira Okawa、Satoshi Hongo 和 Masato Abe：“用于检测颈椎和颅间血管疾病的声波分析” Neurologia medico-chirurgica。

Masato Abe: "Non-destructive estimation of the position of a crack in a concrete block by eliminating the effect of surface wave" Proc.of Acoustical Society of America and Acoustical Society of Japan Third Joint Meeting. 797-802 (1997)

阿部正人：“通过消除表面波的影响对混凝土块中裂缝的位置进行非破坏性估计”美国声学学会和日本声学学会第三次联席会议论文集。

Guoyue Chon, Masato Abe and Toshio Sone: "Improvement of the convergence characteristics of the ANC system with LMS algoritlm by reducing the effect of secondary paths" J.Acoust.Soc.Jpn.(E). 17・6. 295-303 (1996)

Guiyue Chon、Masato Abe 和 Toshio Sone：“通过减少辅助路径的影响，改善 ANC 系统的收敛特性”J.Acoust.Soc.Jpn.(E) 295-303。 1996）

Y.Otawara, N.Kubo, M.Abe, N.Tomitsuka, A.Ogawa, S.Hongo and M.abe: "Sonic and lysis for detection ofcervical and intercranial vascular disease" Neurologia medicc-Chiuurgica. 37・6. 453-458 (1997)

Y.Otawara、N.Kubo、M.Abe、N.Tomitsuka、A.Okawa、S.hongo 和 M.abe：“用于检测颈椎和颅内血管疾病的声波和裂解” Neurologia medicc-Chiuurgica 37・6。 -458 (1997)

M.Abe: "Non-destructive esfmation of theposition of a crack in a concreta blockby eliminating the effect of surface wave" Proc.of Acoust.Soc.Am.and Acoust,Soc,Jpn Thind Joint Meeting. 797-802 (1997)

M.Abe：“通过消除表面波的影响对混凝土块中裂缝的位置进行非破坏性估计”Proc.of Acoust.Soc.Am. 和 Acoust,Soc,Jpn Thind 联合会议。