Abstract
The modal characterization of automotive lighting systems becomes difficult using sensors due to the light weight of the elements which compose the component as well as the intricate access to allocate them. In experimental modal analysis, high speed 3D digital image correlation (HS 3D-DIC) is attracting the attention since it provides full-field contactless measurements of 3D displacements as main advantage over other techniques. Different methodologies have been published that perform modal identification, i.e., natural frequencies, damping ratios, and mode shapes using the full-field information. In this work, experimental modal analysis has been performed in a multi-component automotive lighting system using HS 3D-DIC. Base motion excitation was applied to simulate operating conditions. A recently validated methodology has been employed for modal identification using transmissibility functions, i.e., the transfer functions from base motion tests. Results make it possible to identify local and global behavior of the different elements of injected polymeric and metallic materials.
Highlights
In the automotive industry, there are significant phenomena and dynamics events—due to the engine, road friction, airflow turbulence, etc.—which must be taken into account to guarantee the structural integrity of different systems used in the vehicle
principal response functions (PRFs) are the result of multiplying the singular values matrix and the left-hand matrix from the single value decomposition of the matrix consisted of the frequency response functions (FRF) vectors [1]
PRFs were obtained for each component of the headlamp using the matrix of transmissibility functions after being adapted according to Equation (2)
Summary
There are significant phenomena and dynamics events—due to the engine, road friction, airflow turbulence, etc.—which must be taken into account to guarantee the structural integrity of different systems used in the vehicle. Special attention must be paid to resonances in the typical vibration spectrum that a vehicle undergoes. Considering the lighting system, the vibrational behavior of the different components have a major influence for the correct cut-off performance of the illumination parts. The experimental validation of the predicted features must be performed. In this field, experimental modal analysis is an extended methodology that relies on the identification of the modal parameters, i.e., natural frequencies, mode shapes, and damping ratios [1]. The instrumentation of these systems is especially complex and typically is too invasive so that the results are not representative of the actual behavior
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