Fig. 1

Models of a double panel-acoustic cavity coupling system with in-plane FGMs. (a) The coupling system is equipped with rectangular FG panels; (b) The coupling system is equipped with elliptical FG panels.

Models of a double panel-acoustic cavity coupling system with in-plane FGMs. (a) The coupling system is equipped with rectangular FG panels; (b) The coupling system is equipped with elliptical FG panels.