Figure 1 Schematic Representation of a Hole Figure

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Figure 1 Schematic Representation of a Hole

Figure 1 Schematic Representation of a Hole

Figure 1 Schematic Representation of a Hole

Figure 1 Schematic Representation of a Hole

Figure 2 Schematic Conical Hole

Figure 2 Schematic Conical Hole

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

Radiation Impedance Diffuse Acoustic Field Figure 3 VA-One Model

Radiation Impedance Diffuse Acoustic Field Figure 3 VA-One Model

30 Transmission Loss (d. B) 20 10 0 Acoustic FEM -10 -20 -30 100

30 Transmission Loss (d. B) 20 10 0 Acoustic FEM -10 -20 -30 100 Transfer Matrix Sgard et al. (2007) 1000 Frequency (Hz)

50 Transmission Loss (d. B) 40 30 20 10 0 -10 r=5. 64 mm

50 Transmission Loss (d. B) 40 30 20 10 0 -10 r=5. 64 mm 10 mm × 10 mm 14. 14 mm × 7. 07 mm 20 mm × 5 mm -20 -30 1000 Frequency (Hz) Figure 5 Effect of Hole Shape

Transmission Loss (d. B) 30 20 10 0 Acoustic FEM (Converging) Transfer Matrix (Converging)

Transmission Loss (d. B) 30 20 10 0 Acoustic FEM (Converging) Transfer Matrix (Converging) -10 Acoustic FEM (Diverging Transfer Matrix (Diverging) -20 1000 Frequency (Hz) Figure 6 Results of Conical Hole

30 Transmission Loss (d. B) 20 10 0 -10 -20 1 2 4 6

30 Transmission Loss (d. B) 20 10 0 -10 -20 1 2 4 6 -30 1000 Frequency (Hz) Figure 7 Effect of Radius Ratio of Conical Hole

Figure 8 Dimensions of Hole with Area Change

Figure 8 Dimensions of Hole with Area Change

Transmission Loss (d. B) 40 20 0 -20 1 2 4 6 -40 1000

Transmission Loss (d. B) 40 20 0 -20 1 2 4 6 -40 1000 Frequency (Hz) Figure 9 Effect of Radius Change of Straight Hole

Figure 10 Dimensions of Hole with Expansion

Figure 10 Dimensions of Hole with Expansion

40 Transmission Loss (d. B) 30 20 10 0 -10 -20 Acoustic FEM Transfer

40 Transmission Loss (d. B) 30 20 10 0 -10 -20 Acoustic FEM Transfer Matrix -30 -40 1000 Frequency (Hz) Figure 11 Results of Hole with Expansion Chamber

45 Transmission Loss (d. B) 30 15 0 1 2 4 6 -15 -30

45 Transmission Loss (d. B) 30 15 0 1 2 4 6 -15 -30 -45 1000 Frequency (Hz) Figure 12 Comparison the Effect of Different Cross Area of Hole with Expansion Chamber

Transmission Loss (d. B) 30 20 10 0 0. 2 -10 0. 4 0.

Transmission Loss (d. B) 30 20 10 0 0. 2 -10 0. 4 0. 6 -20 0. 8 -30 1000 Frequency (Hz) Figure 13 Comparison of Length Effect of Hole with Expansion Chamber

80 Transmission Loss (d. B) Acoustic FEM 60 40 Transfer Matrix Without Resonator 20

80 Transmission Loss (d. B) Acoustic FEM 60 40 Transfer Matrix Without Resonator 20 0 -20 -40 1000 Frequency (Hz) Figure 15 Comparison of Results of Hole with Helmholtz Resonator

Transmission Loss (d. B) 10 5 0 Acoustic FEM -5 Sgard et al. (2007)

Transmission Loss (d. B) 10 5 0 Acoustic FEM -5 Sgard et al. (2007) -10 10 100 Frequency (Hz) 1000 Figure 16 Comparison of Results of Large Opening

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