Effect of tip vortices on membrane vibration of flexible wings with different aspect ratios Mustafa Serdar Genç, Halil Hakan Açikel, Hacımurat Demir, Mustafa Özden, Mücahit Çağdaş and Iliasbek Isabekov EPJ Web of Conferences, 114 (2016) 02028 Published online: 28 March 2016 DOI: 10.1051/epjconf/201611402028