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Proposal and Examination of Numerical-Experimental Hybrid Inversion Analysis Schemes Relevant to Potential Problems in Solid Mechanics

与固体力学潜在问题相关的数值实验混合反演分析方案的提出和检验

基本信息

批准号：
02302038
负责人：
KUBO Shiro
金额：
$ 5.95万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Co-operative Research (A)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

项目摘要

Numerical-experimental hybrid inversion analysis schemes were developed and examined. Various kinds of domain/boundary inverse problems, boundary value inverse problems, force inverse problems, material properties inverse problems, and governing equation inverse problems were treated with special emphasis on regularization of the inversion analyses. The main conclusions obtained are summarized as follows.1. Electric potential method was applied to the measurement of three-dimensional cracks and defects. From simulations and experiments it was found that the method can be applied to the measurement of cracks in small specimens. Efficient inversion schemes were developed, and assessment of their applicability was made. A method was proposed to estimate stress intensity factor using an A. C. electric potential reading.2. Finite element. programming was made for analyzing eddy current electromagnetic fields. Its applicability to the measurement of cracks using eddy current was examined.3. … More Electric current fields and temperature fields near cracks were discussed. Thermography was applied to the detection and measurement of defects.4. Several schemes were proposed and examined for estimating displacements and tractions in contact region. Discussion was made on the ill-posedness of the boundary value inverse problems.5. Estimation of boundary values in Galvanic Corrosion was made. Clustering techniques were applied and were found useful in the estimation. Optimization of cathodic protection was made.6. Estimation of boundary values in transient heat conduction was made using boundary element discretization.7. Source identification in wave equation was made using boundary element formulation.8. Acoustic CT (computed tomography) was examined with several regularizing schemes. Schemes were proposed to estimate material properties of a discrete system.9. A scheme was proposed for estimating governing equation from observations.Proposed inversion schemes were applied successfully to treat various kinds of inverse problem. These are expected to give foundations for other inverse analyses. Less

开发并检验了数值-实验混合反演分析方案。各种域/边界反问题，边界值反问题，力反问题，材料特性反问题，和控制方程反问题进行了处理，特别强调反演分析的正则化。主要结论如下：1.将电位法应用于三维裂纹和缺陷的测量。从模拟和实验中发现，该方法可以应用于小样本的裂纹测量。制定了有效的反演方案，并对其适用性进行了评估。提出了一种利用A. C.电位读数。2.有限元编制了涡流电磁场分析程序。验证了该方法在涡流裂纹检测中的适用性. ...更多信息讨论了裂纹附近的电流场和温度场。将热成像技术应用于缺陷的检测和测量.提出了几种计算接触区位移和力的方法。讨论了边值反问题的不适定性.对电偶腐蚀中的边界值进行了估算。聚类技术的应用，并发现有用的估计。对阴极保护进行了优化.采用边界元离散法对瞬态热传导问题的边界值进行了估算.利用边界元法对波动方程进行了震源识别.声学CT（计算机断层扫描）检查与几个正则化方案。提出了离散系统材料性质的估算方案.提出了一种根据观测值估计控制方程的方案，并成功地应用于处理各种反问题。为其它反演分析奠定了基础。少