Frame modal analysis for an electric three-wheel vehicle Faizal Arifurrahman, Indrawanto Indrawanto, Bentang Arief Budiman, Poetro Lebdo Sambegoro and Sigit Puji Santosa MATEC Web Conf., 197 (2018) 08001 Published online: 12 September 2018 DOI: 10.1051/matecconf/201819708001