Vibration and damping analyses of sandwich cylindrical and conical shells using meshfree method Zhen Li, Qingshan Wang, Rui Zhong, Bin Qin and Wen Shao Eur. Phys. J. Plus, 139 6 (2024) 521 Published online: 14 June 2024 DOI: 10.1140/epjp/s13360-024-05279-9