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本文描述抗流激自噪声布设系统的设计和比测结果。当水流通过测量水听器及其电缆时,会产生扰动、颤动和跳动的噪声──自噪声。低频海洋环境噪声的测量常常受这些流激自噪声的干扰。当流速大于1/2节时,尤其明显。我们采用“中性”浮标的水听器结构,消除加速的影响。又采取隔震措施,使电缆的颤动不易传到水听器上。利用透声性能好的薄玻璃钢导流罩,减少湍流压力起伏。我们利用上述技术设计了四种抗流激自噪声布设系统。第Ⅳ系统效果显著,可降低自噪声几分贝至25分贝。
This article describes the anti-shock self-noise distribution system design and test results. When water flows through the hydrophone and its cables, there is noise, jitter and jitter - from the noise. The measurement of low-frequency marine ambient noise is often disturbed by the noise from these streams. This is especially true when the flow rate is greater than 1/2 knot. We use a “neutral” buoy hydrophone structure to eliminate the effects of acceleration. And take isolation measures to make the cable vibration is not easy to spread to the hydrophone. Utilize a thin FRP shroud with good sound transmission to reduce turbulent pressure fluctuations. We use the above technology to design four anti-shock self-noise layout system. IV system significant effect, can reduce the noise from a few decibels to 25 dB.