基于三参数模型的浅海声场最佳频率研究  

Study on optimum frequency of shallow water acoustic field based on three-parameter model

作　　者：窦雨芮 周其斗[1] 谭路[1] 纪刚[1] Dou Yurui;Zhou Qidou;Tan Lu;Ji Gang(Department of Naval Architecture Engineering,Naval University of Engineering,Wuhan 430033,China)

机构地区：[1]海军工程大学舰船与海洋学院

出　　处：《中国舰船研究》2019年第S01期99-107,共9页Chinese Journal of Ship Research

摘　　要：[目的]针对典型浅海环境下的最佳频率问题,[方法]首先,以海底反射损失三参数模型为基础,推导单阶简正波的衰减系数与频率的关系,求解其最佳频率,并通过与前人公式对比验证该算法的正确性;然后,应用该方法研究海底压缩波速度、海底吸收损失幂指数和海底粗糙度对单阶简正波最佳频率的影响。[结果]最佳频率随着海底压缩波速度的增大而减小;吸收损失幂指数越大,最佳频率现象越不明显;粗糙度的变化只对所有简正波叠加后近场的最佳频率有较大影响,对单阶简正波的最佳频率几乎没有影响。[结论]计算的最佳频率更贴近实际海洋环境,可为进一步提高水声通信和探测能力提供一定的帮助。[Objectives]Aiming at the optimum frequency problem of typical shallow water environment,[Methods]the relationship between the attenuation coefficient and frequency of the single-order normal wave was derived based on the bottom reflection loss three-parameter model,and the optimum frequency was solved.The correctness of the proposed algorithm was verified through the comparison with previous formula.Moreover,the method was applied to study the influence of the basement compressional sound speed,attenuation rate power exponents and bottom roughness on the optimum frequency of single-order normal wave.[Results]The optimum frequency decreases with the increase of basement compressional sound speed;the optimum frequency becomes less obvious with the increase of attenuation rate power exponents;the change of bottom roughness has a great influence on the best frequency of near-field after superposition of all normal waves,but has little impact on the optimum frequency of single-order normal wave.[Conclusions]The calculated optimum frequency is realistic for marine environment,and is beneficial for the underwater acoustic communication and detection.

关 键 词：浅海声场 三参数模型 衰减系数 最佳频率 

分 类 号：U661.44[交通运输工程—船舶及航道工程]