Error localization and updating of junction properties for an engine cradle model

Abstract

Extending the bandwidth of validity of FEM models used in vibroacoustic design is a generic objective of model generation processes. Achieving this objective requires a critical review of both testing and modeling processes. Using the case study of an engine cradle, tools used to detect modal test inconsistencies are first illustrated. On the modeling side, weld spots and lines and variations of thickness due to press forming are shown to have relatively minor impact when compared to the contact surfaces. Usual junction simplifications are also shown to play a major role particularly at higher frequencies where more localized modeshapes occur.