Complete low-frequency bandgap in a two-dimensional phononic crystal with spindle-shaped inclusions
Wang Ting1, 2, †, , Wang Hui2, Sheng Mei-Ping1, Qin Qing-Hua2
       

Effects of frequency on spindle center height c for the cases of the lower and upper edges of the first bandgap with b = 18 mm and d = 11 mm.