| 张翼鹏,张大海.弹性海底边界的声导纳公式及对快速场模型的改进[J].声学技术,2006,(6):595~601 |
| 弹性海底边界的声导纳公式及对快速场模型的改进 |
| A modified fast field program model using new admittance formula at elastic sea bottom |
| 投稿时间：2006-08-31 修订日期：2006-10-30 |
| DOI： |
| 中文关键词: 快速场 弹性海底 |
| 英文关键词: fast field program (FFP) elastic bottom |
| 基金项目: |
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| 中文摘要: |
| West对基于传播矩阵的快速场算法进行改进,采用了迭代算法,使得基于传播矩阵的快速场算法的计算速度、计算精度以及稳定性有很大改进。但是,迭代算法仅适用于分层液态介质环境,当海底为弹性介质时,迭代算法无法使用。通过对弹性介质中的声传播规律进行研究,推导了弹性半空间边界处的声导纳计算公式。用该公式替代文献[4]给出的边界处声导纳计算公式后,迭代算法可以计算海底为弹性介质时的声场。根据所述方法编制了相应的快速场程序,通过算例比较,说明了该方法的有效性。在典型的浅海环境下,用快速场计算了不同频率的声传播损失曲线。计算结果表明,海底存在切变波时,低频声传播受到的影响较大。因此在考虑低频声传播时,将海底建模为弹性介质是必要的。 |
| 英文摘要: |
| As the improved fast field program (FFP) model introduced by West is not applicable to the elastic sub-bottom environment, we propose a modification to the model. Based on the analysis of sound propagation in the elastic medium, we derive the admittance formula at the lowest bou-ndary when the sub-bottom is an elastic half space. With the derived formula, the modified FFP model can be used to calculate the sound field in shallow water with an elastic sub-bottom. Results of two test cases verify the validity of the proposed method. Furthermore, sound propagation in the shallow water with an elastic sub-bottom is studied based on the modified FFP. The results demonstrate that the elastic sub-bottom has much stronger influence on low frequency sound. |
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