Intelligent Remote Sensing of Deformation and Strain Pattern of Flexible Structures

柔性结构变形和应变模式的智能遥感

• 批准号: 05555029
• 负责人: KISHIMOTO Kikuo
• 金额: $ 3.58万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05555029/
• 关键词: Deformation Measurement; Strain Measurement; Image Processing; Plastic Film; Neural Network; Pattern Matting; 変位計測; ひずみ測定; 局所加熱

A measuring system of deformation and strain distribution has been developed in order to evaluate the deformable structures such as dome structure or space structure. The system which is developed in this study is composed of the material testing section and the image processing section. In the meterial section, a new type of testing machine has been constructed in which the chacking parts can move symmetrically on the both side, so that observation region does not move during loading in one direction. The deformation of the pattern is recorded by a VCR camera and is transmitted to the micro-computer afrer the tests.The two types of image processing methods have been considered. In the first method, a lattice pattern is printed on the specimen surface and a cross point is searched by the image recognition technique base on the neural network. In the actual image data, the influence of the noise can not be removed, so that a manual treatment is required to compensate the lack of the image recognition. Determination of the strain distribution is performed by applying a similar method used in the finite element method. In the second method, a random dot pattern is printed on the specimen, the defamation of the specimen is evaluated by the pattern matching the image data before and after deformation.The present method is applied to study the mechanism of wrinkle formation due to localized heating of thin plastic films. The good agreement is obtained between the results of the image processing and finite element analysis. It is found that the magnitude of the negative value of principal stress could be used as an appropriate critical parameter for predicting initiation of wrinkle.

为了对穹顶结构、空间结构等可变形结构进行评估，研制了一套变形和应变分布测量系统。本研究所开发的系统由材料测试部分和图像处理部分组成。在材料部分，构造了一种新型的试验机，其中的卡盘部件可以在两侧对称移动，从而在一个方向上加载时观察区域不移动。用VCR摄像机记录图形的变形，并在试验后将其传送给微机，分别考虑了两种图像处理方法。在第一种方法中，在试件表面印刷一个点阵图案，并通过基于神经网络的图像识别技术搜索交叉点。在实际的图像数据中，噪声的影响无法去除，因此需要人工处理来补偿图像识别的不足。应变分布的确定通过应用有限元法中使用的类似方法来执行。第二种方法是在试样上印刷随机点图案，通过图案与变形前后的图像数据的匹配来评价试样的变形程度，并将该方法应用于研究塑料薄膜局部加热起皱的机理。图像处理结果与有限元分析结果吻合较好。结果表明，负主应力的大小可以作为预测起皱的临界参数。

项目成果

小泉,納冨,岸本: "プラスチックフィルムの破壊過程とその場観察" 日本包装学会誌. 3. 16-27 (1994)

小泉、Notomi、Kishimoto：“塑料薄膜的破坏过程和现场观察”日本包装学会杂志 3. 16-27 (1994)。

武智,岸本,納冨,渋谷,小泉: "局所加熱を受けた薄膜材のしわ発生について" 日本機械学会第71期通常総会講演論文集(II). 940-10. 370-372 (1994)

Takechi、Kishimoto、Natomi、Shibuya、Koizumi：“关于局部加热时薄膜材料中皱纹的发生”，日本机械工程师学会第 71 届普通会议记录（II）370-372。 (1994)

納冨,岸本,小泉: "高分子フィルムの変形・破壊過程のその場観察" 材料試験への最新画像技術応用シンポジウム. 53-58 (1994)

Notomi、Kishimoto、Koizumi：“聚合物薄膜变形和断裂过程的原位观察”最新成像技术在材料测试中的应用研讨会 53-58 (1994)。

I.TAKECHI,K.KISHIMOTO,M.NOTOMI,T.SHIBUYA,T.KOIZUMI: "Formation of wrinkles in thin films by localized heating." Proceeding of JSME 71th Annual Coference. (940-10). 370-372 (1994)

I.TAKECHI、K.KISHIMOTO、M.NOTOMI、T.SHIBUYA、T.KOIZUMI：“通过局部加热在薄膜中形成皱纹。”

M.NOTOMI,K.KISHIMOTO,T.KOIZUMI: "In situ observation of deformation and fracture behaviors of polymer films" Proceeding of Symposium of New Image Technology Applied to Material Tests. 53-58 (1994)

M.NOTOMI，K.KISHIMOTO，T.KOIZUMI：“聚合物薄膜变形和断裂行为的原位观察”新图像技术应用于材料测试研讨会论文集。