具有绝热扰动模态的波动深水声传输的时间相干性

IF 1.3 3区 物理与天体物理 Q3 ACOUSTICS
Xiaotao Yu, Linhui Peng, Gaokun Yu
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引用次数: 0

摘要

结合微扰理论的绝热近似给出了含时变随机内波的二维深水声场时间相干性的快速正态解。用一阶微扰理论推导了内波引起的模态变化[C]。T. Tindle, L. M. O 'Driscoll和C. J. Higham,距离依赖耦合模摄动理论,J. Acoust。Soc。美国医学杂志。108(1)(2000)76-83]。绝热法忽略振幅上的模态扰动,只考虑相位上的波数扰动。时间相干函数的AP表达式在理论上与绝热输运方程理论一致[J]。A. Colosi, T. K. Chandrayadula, A. G. Voronovich, V. E. Ostashev,随机声速扰动下海洋声传输的耦合模输运理论:深海环境相干性,声学学报。Soc。中国农业科学学报,2013(4):319 - 3133。计算了几个低频率和1000 km范围内绝热时间相干函数的数值结果。然后用考虑正向散射的单向耦合理论对计算得到的相干时间尺度进行了检验[a]。吴建军,吴建军,张建军,声波信号的时间相干性研究,声学学报。Soc。美国医学杂志,2011(6):3590-3597。比较表明,两种方法的相干时间的范围和频率依赖关系非常接近。这与众所周知的频率反比定律和平方根范围反比定律是一致的。此外,还研究了相干时间对内波能量的依赖关系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Temporal Coherence for Sound Transmission Through Fluctuating Deep Water with Adiabatic Perturbed Modes
Adiabatic approximation (AP) combined with perturbation theory gives a fast normal-mode solution of temporal coherence for sound field in a two-dimensional deep water with time-varying random internal waves. Internal waves induced mode changes are deduced using the first-order perturbation theory [C. T. Tindle, L. M. O’Driscoll and C. J. Higham, Coupled mode perturbation theory of range dependence, J. Acoust. Soc. Am. 108(1) (2000) 76–83]. And mode perturbations in amplitude are neglected by the adiabatic method with wavenumber perturbations in phase merely considered. The AP expression of temporal coherence function is theoretically identical to the adiabatic transport equation theory [J. A. Colosi, T. K. Chandrayadula, A. G. Voronovich and V. E. Ostashev, Coupled mode transport theory for sound transmission through an ocean with random sound speed perturbations: Coherence in deep water environments, J. Acoust. Soc. Am. 134(4) (2013) 3119–3133]. Numerical results of the adiabatic temporal coherence function for several low frequencies and ranges up to 1000[Formula: see text]km are calculated. Then the coherence time scales obtained from the calculations are examined by a one-way coupled theory considering forward scattering [A. G. Voronovich, V. E. Ostashev and J. A. Colosi, Temporal coherence of acoustic signals in a fluctuating ocean, J. Acoust. Soc. Am. 129(6) (2011) 3590–3597]. Comparisons demonstrate that the range and frequency dependence of coherence time for both methods are quite close. And this shows good agreement with the well-known inverse frequency and inverse square root range laws. In addition, the internal wave energy dependence of coherence time is also studied.
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来源期刊
Journal of Theoretical and Computational Acoustics
Journal of Theoretical and Computational Acoustics Computer Science-Computer Science Applications
CiteScore
2.90
自引率
42.10%
发文量
26
期刊介绍: The aim of this journal is to provide an international forum for the dissemination of the state-of-the-art information in the field of Computational Acoustics. Topics covered by this journal include research and tutorial contributions in OCEAN ACOUSTICS (a subject of active research in relation with sonar detection and the design of noiseless ships), SEISMO-ACOUSTICS (of concern to earthquake science and engineering, and also to those doing underground prospection like searching for petroleum), AEROACOUSTICS (which includes the analysis of noise created by aircraft), COMPUTATIONAL METHODS, and SUPERCOMPUTING. In addition to the traditional issues and problems in computational methods, the journal also considers theoretical research acoustics papers which lead to large-scale scientific computations.
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