Method for measuring underwater sound source low frequency radiation sound power in rectangular reverberation water tank arranged in air

Abstract

The invention relates to a method for measuring sound source radiation sound power and particularly relates to a method for measuring underwater sound source low frequency radiation sound power in a rectangular reverberation water tank arranged in the air. The method comprises steps that, a sound source is fixed at a position of a reverberation water tank for emission, and a hydrophone is fixed at another position to measure a sound pressure amplitude of the reception position; a reverberation water tank normal frequency calculation algorithm taking consideration of influence of a water tank wall structure on a sound field is employed, each-order normal frequency of the measurement water tank sound field is determined; the sound pressure amplitude measured in the step (1) and the water tank sound field normal frequency determined in the step (2) are taken as input parameters, the algorithm calculating the free field sound power in the reverberation water tank is employed, and the sound power of a to-be-measured sound source in the free field is determined. The method does not need to utilize a known sound source to carry out correction on the reverberation water tank sound field. When the sound field normal frequency in the water tank and the speed potential function are determined, influence of the water tank wall structure on the sound field is considered, so the sound field calculation result in the water tank is more accurate.

Description

technical field [0001] The invention relates to a method for measuring the radiated sound power of a sound source, in particular to a method for measuring the low-frequency sound power of an underwater sound source in a rectangular reverberation tank placed in the air. Background technique [0002] The main applications for measuring the radiated sound power of underwater sound sources are: noise evaluation and control of underwater vehicles such as submarines and torpedoes; noise evaluation and control of underwater operating equipment; sound source level calibration of underwater acoustic transducers Wait. Compared with the free field test, measuring the radiated sound power of the sound source in the reverberation tank has the advantages of simple operation, high test signal-to-noise ratio, and good measurement repeatability. Since there are few normal modes and uneven sound field distribution in the low-frequency domain of the tank, the low-frequency application of the ...

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Problems solved by technology

Since then, the research on the use of reverberation water tanks to measure the sound power of sound sources was limited to the measurement of the sound radiation characteristics of different complex sound sources under the conditions of reverberation, and did not expand the application frequency domain of water tanks to low frequencies; until Tang Rui studied The sound field and free field of the reverberation tank have inherent transfer characteristics that are independent of the characteristics of the sound source, which greatly expands the frequency application range of the reverberation tank to low frequencies (Tang Rui. Low-frequency acoustic radiation prediction methods and experimental testing techniques for underwater shell structures Research [D]. Harbin: Harbin Engineering University, 2013), and this measurement method needs to measure the spatial average sound pressure in the reverberation control area of ​​the tank, once the low-frequency non-normal frequency intensity emitted by the sound source does not satisfy the measurement signal-to-noise This method fails if required

At present, there is no report on the method of measuring the low-frequency sound power of a sound source in a reverberation tank that does not require a known sound source to correct the sound field of the tank

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