T-2-4-2 Identification of force applying on mechanical structure with inverse problem and regularization method for fatigue analysis

概要

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Engineering systems have very large degrees of freedom in their finite element models. And it is not possible to measure the correct responses at all degrees of freedom because of economic and physical restrictions. This measurement sparseness caused by the characteristics of the measuring instrument and/or by the inexperience of the experimenter is an inevitable factor in the damage detection and assessment. Thus, the sparseness and the noise in the measurements should be considered properly in the force identification. In this study, the regularization method is adopted to alleviate the ill-posedness of the inverse problems. This technique identifies constitutive parameters in the analytical model such that is gives the best possible correlation with the measured test data. The dynamic response due to external force of vehicle structure is described in terms of strain form experimental and analytical response. This procedure can be used to get the transferred force to use an input data of fatigue analysis for a sub-structure of which the experimental response is difficult to get directly. To examine the proposed method, the external force applying on city bus is identified. Using finite element analysis and experiment, fatigue life of a window pillar is analyzed under the identified force by the procedure of above mentioned.
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