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活塞式声源具有驱动能力强、低频声场可控的特点,已作为目标设定式扫雷声源广泛应用。利用边界元法计算了无限大障板活塞和管侧刚性活塞的辐射声场,结果表明:管侧活塞明显增强了低频段的声辐射能力,在3~4 kHz之间,声辐射阻出现极大值,声辐射抗出现极小值,表明管侧活塞在该频段辐射能力最强,辐射效率最高,出现了声辐射“共振点”。
Piston-type sound source has strong driving ability, low-frequency sound field controllable features, has been set as a target set of widely used mine-sweeping sound source. The boundary acoustic element method was used to calculate the radiated sound field of the infinite baffle piston and the tube-side rigid piston. The results show that the tube-side piston obviously enhances the sound radiation ability of the low frequency band. Acoustic radiation resistance appears extremely large between 3 and 4 kHz Value, the minimum value of acoustic radiation appeared, indicating that the tube side of the piston in the band radiation the strongest radiation efficiency, the highest sound radiation “resonance point”.