中国物理B ›› 2016, Vol. 25 ›› Issue (12): 124312-124312.doi: 10.1088/1674-1056/25/12/124312

• SPECIAL TOPIC—Acoustics • 上一篇    下一篇

Research on the acoustic scattering function and coherence properties from rough seafloor based on finite element model

Bo Lei(雷波), Yi-Xin Yang(杨益新), Yuan-Liang Ma(马远良), Dong-Xu Chen(陈东旭)   

  1. School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China
  • 收稿日期:2016-07-25 修回日期:2016-09-27 出版日期:2016-12-05 发布日期:2016-12-05
  • 通讯作者: Yi-Xin Yang E-mail:yxyang@nwpu.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant No. 61571366), the Natural Science Basic Research in Shaanxi Province of China (Grant No. 2015JQ5199), and the Fund of Science and Technology from the Underwater Test and Control Laboratory (Grant No. 9140c260201130c26096).

Research on the acoustic scattering function and coherence properties from rough seafloor based on finite element model

Bo Lei(雷波), Yi-Xin Yang(杨益新), Yuan-Liang Ma(马远良), Dong-Xu Chen(陈东旭)   

  1. School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China
  • Received:2016-07-25 Revised:2016-09-27 Online:2016-12-05 Published:2016-12-05
  • Contact: Yi-Xin Yang E-mail:yxyang@nwpu.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant No. 61571366), the Natural Science Basic Research in Shaanxi Province of China (Grant No. 2015JQ5199), and the Fund of Science and Technology from the Underwater Test and Control Laboratory (Grant No. 9140c260201130c26096).

摘要:

Acoustic scattering from a rough sea bottom is recognized as a main source of reverberation. In this study, scattering properties from a layered bottom were exploited based on the finite element model. The scattering strength and loss from the layered rough seabed were investigated by ensembling the realizations of rough interface. They were found to be dependent on the thickness of sediment, and interference was significant in the case of thin sediment. Through verification of the finite element model, the scattering loss could be evaluated using the Eckart model with a proper sound speed in the thick sediment. The multiple scattering effect on the sound field was also exploited. It revealed that the effect depended strongly on the bottom type.

关键词: finite element, rough seafloor, scattering function, coherence

Abstract:

Acoustic scattering from a rough sea bottom is recognized as a main source of reverberation. In this study, scattering properties from a layered bottom were exploited based on the finite element model. The scattering strength and loss from the layered rough seabed were investigated by ensembling the realizations of rough interface. They were found to be dependent on the thickness of sediment, and interference was significant in the case of thin sediment. Through verification of the finite element model, the scattering loss could be evaluated using the Eckart model with a proper sound speed in the thick sediment. The multiple scattering effect on the sound field was also exploited. It revealed that the effect depended strongly on the bottom type.

Key words: finite element, rough seafloor, scattering function, coherence

中图分类号:  (Rough interface scattering)

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