Figure 1 Schematic Representation of a Hole 𝑦 𝑝 𝑟 𝑝 𝑖 𝑝 𝑠 𝑍 𝑟1 𝑝 1 𝑢 1 𝑥 𝑝 𝑖1 𝑝 𝑖2 𝑝 2 𝑢 2 𝑝 𝑡 𝑍 𝑟2 𝑧 Figure 1 Schematic Representation of a Hole

Figure 1 Schematic Representation of a Hole

Figure 2 Schematic Conical Hole 𝐿 𝑙 1 𝑙 2 𝑟 2 𝑆 2 𝑟 1 𝑆 1 Figure 2 Schematic Conical Hole

Figure 2 Schematic Conical Hole

Radiation Impedance Diffuse Acoustic Field Figure 3 VA-One Model

Radiation Impedance Diffuse Acoustic Field Figure 3 VA-One Model

Figure 4 Comparsion of Results of a Hole (𝑅=5.64𝑚𝑚, 𝐿=100𝑚𝑚)

Figure 5 Effect of Hole Shape

Figure 6 Results of Conical Hole

Figure 7 Effect of Radius Ratio of Conical Hole

𝑟 𝑅 𝑙 2 𝑙 1 Figure 8 Dimensions of Hole with Area Change

Figure 9 Effect of Radius Change of Straight Hole

𝑟 3 𝑟 1 𝑟 2 𝑙 3 𝑙 2 𝑙 1 Figure 10 Dimensions of Hole with Expansion

Figure 11 Results of Hole with Expansion Chamber

Figure 12 Comparison the Effect of Different Cross Area of Hole with Expansion Chamber

Figure 13 Comparison of Length Effect of Hole with Expansion Chamber

𝑉 𝑐 𝐴 1 𝐵 1 𝐶 1 𝐷 1 𝐴 2 𝐵 2 𝐶 2 𝐷 2 𝑅 𝑛 𝑙 𝑛 Figure 14 Schematic Representation of Hole with Helmholtz Resonator ( 𝑙 𝑛 =10𝑚𝑚, 𝑅 𝑛 =5.64𝑚𝑚, 𝑉 𝑐 =12𝑐 𝑚 3 )

Figure 15 Comparison of Results of Hole with Helmholtz Resonator

Figure 16 Comparison of Results of Large Opening