Modal Identification in an Automotive Multi-Component System Using HS 3D-DIC

• Published in: Materials Vol. 11; no. 2; p. 241
• Main Authors: Molina-Viedma, Ángel Jesús, López-Alba, Elías, Felipe-Sesé, Luis, Díaz, Francisco A
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 05.02.2018; MDPI
• Subjects: Algorithms; automotive lighting system; Damping ratio; Digital imaging; experimental modal analysis; Fuel consumption; HS 3D-DIC; Identification; Lasers; Lighting; Lighting systems; Methods; Mining engineering; Modal analysis; Modal identification; multi-component; multi-material; Three dimensional motion; Transfer functions; transmissibility functions; Weight reduction; automotive lighting system; experimental modal analysis; HS 3D-DIC; multi-component; multi-material; transmissibility functions
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma11020241

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.