| 引用本文: | 刘巍,肖汶斌,程兴华,等.提高近场精度的海洋声学快速场改进模型.[J].国防科技大学学报,2019,41(6):168-174.[点击复制] |
| LIU Wei,XIAO Wenbin,CHENG Xinghua,et al.Improving near-source region accuracy algorithms of fast field program of ocean acoustics[J].Journal of National University of Defense Technology,2019,41(6):168-174[点击复制] |
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| 提高近场精度的海洋声学快速场改进模型 |
| 刘巍,肖汶斌,程兴华,王勇献,张理论 |
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(国防科技大学 气象海洋学院, 湖南 长沙 410073)
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| 摘要: |
| 为了提高海洋声学快速场模型在近场区域的计算精度,分析了影响经典快速场模型精度的因素,主要包括Bessel函数近似、忽略内行波项以及在水平距离最远处波数采样率过低,这些因素导致快速场模型近场误差较大、远场水平距离最远处结果不正确(计算结束后需要去除水平距离后段的声场)。提出能够提高经典快速场模型近场计算精度的改进模型,改进部分主要是采用保留内行波项的近似Bessel函数,再将近场上下两个基于声源点与对称轴的三角形区域用波数积分解(使用精确Bessel函数)覆盖。算例测试结果表明:与经典快速场模型相比,改进模型可在绝对时间增加较少的情况下,显著提高近场计算精度,综合性能更优；与波数积分法相比,改进模型在误差为同量级的情况下,积分时间大幅降低,实际应用价值更高。 |
| 关键词: 海洋声学 快速场 波数积分 |
| DOI：10.11887/j.cn.201906025 |
| 投稿日期：2018-08-15 |
| 基金项目:国家自然科学基金资助项目(11272352,61379056,61702531,51709267)；国家重点研发计划资助项目(2016YFC1401800)；湖南省自然科学基金资助项目(2017JJ2305)；国防科技大学科研计划资助项目(ZK16-03-46)；航天支撑技术基金资助项目(2014) |
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| Improving near-source region accuracy algorithms of fast field program of ocean acoustics |
| LIU Wei, XIAO Wenbin, CHENG Xinghua, WANG Yongxian, ZHANG Lilun |
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(College of Meteorology and Oceanology, National University of Defense Technology, Changsha 410073, China)
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| Abstract: |
| In order to improve the near-source region accuracy of the FFP (fast field program) of ocean acoustics, the factors affected the accuracy of the classical FFP were analyzed, which includes the approximation of Bessel function, the neglection of incoming wave term and the low sampling frequency at the farthest horizontal distance region. These factors can lead to large near-source region errors and incorrect results at the farthest horizontal distance region (after the calculation, the acoustic field in the region should be removed). Based on the classical FFP model, improving near-source region accuracy algorithms were presented, which includes the approximate Bessel function with incoming wave term and the solutions in the up-down two triangular domains by covering the source point and symmetric axis with the wavenumber integration solutions (using exact Bessel function). The test cases show that, compared with the classical FFP model, the proposed model can significantly improve the near-field calculation accuracy and the comprehensive performance under the condition of less absolute time increased; compared with the direct wavenumber integration method, the integration time of the improved model is significantly reduced and the practical application value is higher under the condition of the same error order of magnitude. |
| Keywords: ocean acoustics fast field program wavenumber integration method |
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