振動モード同定による単層CFRP薄板物性値の同時同定手法の改善

抄録

The purpose of this study is to improve the identification method of material properties using vibration characteristics of CFRP thin plate. This identification method selects five material properties by matching vibration modes and natural frequencies obtained from forced vibration experiment and analysis by Ritz method. In order to match vibration modes and natural frequencies, differential evolution method (DE) optimizes five material properties at the same time. Then an evaluation function is used to evaluate the matching degree between experimental results and analysis results. This optimization is repeated until terminal criteria is satisfied, and the individual with the highest matching degree is selected as identification result. In the previous study, identification results were unstable because of the inaccuracy of the evaluation function. Therefore, in this study, a new evaluation function was developed, and its accuracy was verified. In the identification using test pieces which have many aspect ratios and fiber orientation angles, material properties of simulation data are perfectly identified at almost all of the test pieces. As a result, it has been revealed that optimization method using new evaluation function is accurate and wide test pieces are suitable for identification.