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XIE Dingding, LI Qi, TANG Rui, SHANG Dajing, REN Chao. Sound power measurements in a non-anechoic tank with random surface[J]. ACTA ACUSTICA, 2023, 48(3): 524-531. DOI: 10.15949/j.cnki.0371-0025.2023.03.004
Citation: XIE Dingding, LI Qi, TANG Rui, SHANG Dajing, REN Chao. Sound power measurements in a non-anechoic tank with random surface[J]. ACTA ACUSTICA, 2023, 48(3): 524-531. DOI: 10.15949/j.cnki.0371-0025.2023.03.004

Sound power measurements in a non-anechoic tank with random surface

  • A method that uses a random surface to improve measurements of the radiated sound power in a non-anechoic tank is proposed. Based on the finite element method, the feasibility of improving sound power measurements at low frequencies by random surface in a non-anechoic pool is analyzed. The sound power of a spherical source is measured in a non-anechoic tank with a size of 1.2 m × 1.0 m × 0.8 m. Experimental results show that in contrast to a tank with a steady surface, once a random surface is generated using a water pump, the diffusion is significantly improved: (1) the Schroeder frequency is decreased from 10015 Hz to 8370 Hz, indicating the range of measurement is extended to lower frequencies; (2) the frequency response curves measured by spatially averaging techniques have smaller fluctuation and is closer to free-field value, that is, the accuracy of measurement is significantly improved. The proposed method contributes to obtaining more accurate narrowband measurements of underwater target acoustic characteristics in underwater environment environments.
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