Finite element calculation to predict vibration behavior of headlamp is important to improve conception. Decreasing the number of non conformity during prototype validation helps to reduced lead-time. The aim is to predict the first frequency of resonance, as well as the areas of potential mechanical weakness during development. To insure good prediction of the results, finite element calculation model must be validated. 3D solid modal calculation and experimental modal analysis of headlamp components have been performed. Quality of the finite element model is evaluated by comparing the calculated and experimental results in FEMtools using Modal Assurance Criteria, (MAC). Examples of this method applied to the housing of a headlamp, to the optical module of a headlamp and finally to a full headlamp are presented. MAC values above 70% on modes are achieved with a first frequency accuracy at less than 5%. 3D solid finite model is validated and can be used to predict frequency and potential weakness areas of components and headlamp.
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