Updating the behavior engineering model
Present research efforts focus to combine finite element analysis and testing in one common framework.Experimental and operational modal analysis and simulation make benefit from common databases.In parallel, samples of two aluminum material plates connected by different quantities of rivets (1, 3 and 5) are built and tested in order to be known its modal characteristics – natural frequencies and mode shapes.The purpose of the different settings is to get the best numerical riveted lap joint representation relatively to the experimental one.However, when using finite element models considerable differences between the predicted and observed behavior of a structure can occur, even when best industry practices are used to create such models.Because of thesedifferences there is a need to validate the detailed finite element model of the Pioneering Spirit.Access to society journal content varies across our titles.
Correlation between numerical and experimental analysis using model updating techniques helps engineers to asses uncertainty.
Two updating cases show that the optimization sequences converge quickly and significant improvements in frequency prediction are achieved.
With the inclusion of the thickness parameter, the second case yields a maximum of under 0.4% in frequency difference, and all parameters attain more reliable updated values.
To investigate this a simplified finite element model of the Pioneering Spirit was created using beam elements, this model provides the predicted behavior.
Then sensitivity-based finite element model updating was implemented and applied to the beam model.