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Figure 3

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The secondary source approach in equation (10) adds (a) the sound field generated by the primary source S and the rigid scattering object, and (b) the sound fields radiated by secondary piston sources SSi with vibration velocities uSS,i, when pistons are set in a rigid scattering object. Only the geometrical acoustics components are illustrated; diffraction components should be added to both (a) and (b).

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