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THE DEPENDENCE OF SOUND ABSORPTION BY AN ISOLATED ACOUSTIC RESONATOR ON THE RESONATOR’S VOLUME

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Figure 1. Computational Diagram of an Isolated Acoustic Resonator with a Cross-shaped Slit where theResonator Volume V1 Varies with the Increase in Its Height H1 and the Resonator Volume V2 Varies withthe Increase in Its Length and Width
Figure 3 depicts changes in the real parts of the impedance of the resonator’s bodyindicating losses of sound energy.
Figure 4. The Volume Dependence of the Imaginary Part of Impedance of an Isolated AcousticResonator’s Body: 1 – h = 60 cm; 2 – h = 180 cm; 3 – h = 240 cm – volume increases on account of heightincrease with constant area; 4 – S = 4.2x3 m2 = 12.6 m2; 5 – 4.8x3.6 m2 = 17.28 m2 – volume increases onaccount of area increase with constant height of 60 cm
Figure 6. The Dependence of Sound Absorption Coefficients on Frequency and Resonator’s Volume

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