【摘要】 舰船地震波场是指舰船航行时所产生的船体震动噪声和舰船辐射噪声的低频部分,通过海水辐射到达海底,其中部分声能耦合到海底并以弹性介质波的形式在海底传播。海底沉积物作为声在浅海中传播的下边界,不同底质的海底对声波在波导中的传播具有重要的影响。根据海底反射损失对3种典型的海底做了建模并分析了其对舰船地震波传播的影响。不同频率的低频声波在底质中的吸收衰减各不相同。可以利用能够传播较远距离的某些频率的低频声波实现对舰船的远距离探测。更多还原

【Abstract】 The ship’s seismic-wave field which is studied in this paper refers to the ship’s low-frequent acoustic wave which propagates through the seabed.Marine sediment is the reflecting boundary of the shallow sea,and the sound wave in the wave-guide of the shallow sea is greatly influenced by the marine sediment.Three typical marine sediments are analyzed in this paper.Sound wave consists of different frequency,and the sound wave’s attenuation is variety in many different sediments.The sound wave of some specifically frequency can transmit long distance through the seabed.The ship’s long-range detection can be carried out by using seismometer.更多还原