Finite element model updating based on response surface methodology Sexy web amater
A procedure based on finite element (FE) modeling, response surface-based model updating and random vibration analysis is presented to predict the fatigue life of plastic ball grid array (PBGA) components mounted on daisy chain printed circuit board (PCB).
A specially designed fixture is used to mimic the typical boundary condition of plug-in PCBs.
However, the updated matrices do not generally maintain structural connectivity and the corrections suggested are not always physically meaningful.The accuracy of the FE model is essential for predicting fatigue life under random vibration.Although there are literatures showing that the uncertainties of the material properties and the boundary condition of PCB have strong effects on the simulation results , very few author presented the model updating procedure for PCBs.Two objective functions are created using resonant frequencies and minimized using a multi-objective genetic algorithm (MOGA).The results show that commercial FE software can be used to improve the accuracy of the FE model in a practical way.
Random vibration analysis is performed and good agreement with test result is obtained.