海面干涉对船舶水下辐射噪声测量的影响及其消减方法

针对海面干涉对船舶辐射噪声测量的影响,进而导致声源级测量不准确的问题,文章给出了利用时间平均、深度平均、1/3倍频程谱级3种数据处理方法减弱海面干涉的影响,通过模型仿真验证了以上方法的有效性。根据船舶水下辐射噪声测量的国际标准,在浅海测量了某新型科考船不同航速下的水下辐射噪声,并采用前述方法进行了数据处理与分析。计算了不同航速下被测船舶辐射噪声1/3倍频程频带声压级,并与挪威船级社发布的辐射噪声衡准值进行了对比。结果表明被测船舶噪声低频控制较好,高频控制较差,高航速(13 kn)被测船舶的2 kHz以上辐射噪声大于衡准值。

Effect and mitigation method of the sea surface interference on the underwater ship radiated noise measurement

Owing to the impact of sea surface interference,the observed results of underwater radiated noise from vessels usually were inaccurate.Three approaches were proposed to mitigate the influence of sea surface interference:averaging across the time,averaging across multiple hydrophones,presenting the data in terms of the One-Third Octave(OTO)bands rather than as narrowband data.The effectiveness of the approaches were validated by ray model.According to the standard released from International Organization for Standardization(ISO),the underwater noise radiated from a new research vessel was measured.During the data collection,the Vessel sailed at different speeds.Furthermore,the one-third octave sound band pressure levels of the radiated noise at different speeds were calculated and compared with the standard SLIENT-E published by the DET Norske Veritas(DNV).Analysis result indicated that the low frequency radiated noise of the research vessel is well controlled,but the high frequency part is poor suppressed.