Inverse Load Identification in Stiffened Plate Structure Based on in situ Strain Measurement

For practical engineering structures, it is usually difficult to measure external load distribution in a direct manner, which makes inverse identification important. Specifically, typical problem, for the models (e.g., response matrix) are often ill-posed, resulting degraded accuracy and impaired noise immunity of identification. This study aims at identifying loads stiffened plate structure, through comparing effectiveness different methods parameter selection regulation problems, including Generalized Cross Validation (GCV) method, Ordinary method truncated singular value decomposition method. With demonstrated high accuracy, GCV used identify concentrated three directions vertical, lateral longitudinal) exerted on plate. The results show that able effectively multi-source static loads, with relative errors less than 5%. Moreover, under situation swept frequency excitation, when excitation near natural can achieve much higher compared inversion. At other frequencies, average recognition error 10%.