Investigation and optimal design of band gap tunability in fractal phononic crystalsShuai Yang, Jia-Hao Yin, Xiao-Jing Zhu, Kai Wang, Shi-ke Zhang, Lu Cao, Peng-Yu Guo and Yong LiuActa Acust., 9 (2025) 18DOI: https://doi.org/10.1051/aacus/2025007