Modal Analysis of Lenses Used in Automotive Lighting Industry and Obtaining MAC Matrix

Authors : Erhan AY, Barış EDİZ, Birhat SÖNMEZAY, Sevda TELLİ ÇETİN

Pages : 401-413

Doi:10.24107/ijeas.571192

View : 21 | Download : 8

Publication Date : 2019-07-25

Article Type : Research Paper

Abstract :In this study, 4 different pieces of automotive rear lamp lenses which are made of Polymethylmethacrylate insert ignore into journalissuearticles values(PMMA); and have different geometries have been inspected. Free-free natural frequencies and mode shapes of lenses have been estimated by the help of ANSYS WB® Finite Element Analysis insert ignore into journalissuearticles values(FEA); software. Meanwhile, by the help of Experimental Modal Analysis insert ignore into journalissuearticles values(EMA); methods; natural frequencies, damping ratios and mode shapes of the lenses have been determined. Finally, mode shapes calculated by FE and measured by EMA were compared and Modal Assurance Criteria matrix insert ignore into journalissuearticles values(MAC); was determined. After experimental modal tests, FRF’s were calculated by DEWESoft® X3 software then natural frequencies, damping ratios and mode shapes were calculated by the use of ME’scope® VESVT-570 Visual Modal software. In addition, MAC was calculated by the help of MEScope® software. The main reason for the use of such experimental methods was to understand if the assumptions made before theoretical analysis were satisfied in reality or not.
Keywords : Auotomotive Lighting, Polymethylmethacrylate, Finite Element Modal Analysis, Experimental Modal Analysis, Modal Assurance Criteria