Under a cylindrical coordinate system, an annular cylinder of outer radius r1, inner radius r2, and length L is shown in Fig. 1. Assuming an acoustically rigid outer wall, the inner cylindrical wall represents a MPP boundary with:
Under a cylindrical coordinate system, an annular cylinder ofouter radius r1, inner radius r2, and length L is shown in Fig. 1.Assuming an acoustically rigid outer wall, the inner cylindrical wallrepresents a MPP boundary with: