Direct FVM Simulation for Sound Propagation in an Ideal Wedge

Ji, Hongyu; Xu, Xin-hai; Guo, Xijing; Ye, Shuai; Chen, Juan; Yang, Xuejun

doi:10.1155/2016/3703974

Cited by 5 publications

(3 citation statements)

References 19 publications

(29 reference statements)

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“…An acoustic propagation model has been used to simulate the emission from one emitter to one receiver in underwater environments and to test the performance of the aforementioned encoding schemes. Several mathematical techniques can be used, such as ray-tracing, normal-mode models or the parabolic equation [12]. For this work the ray-tracing model fully described in [5] has been used.…”

Section: Underwater Propagation Modelmentioning

confidence: 99%

Doppler resilience evaluation of different encoding techniques for underwater acoustic ranging systems

Murano

Perez-Rubio

Aparicio

et al. 2019

2019 24th IEEE International Conference on Emerging Technologies and Factory Automation (ETFA)

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Underwater acoustic communication or localization systems can be affected by the Doppler effect when the receiver or emitter is in motion. In those cases, the use of an a appropiate encoding/modulating scheme play a pivotal role in the time of arrival estimations, avoiding the need of complex auxiliary Doppler compensation algorithms. This paper presents a Doppler resilience evaluation of Zadoff-Chu based schemes, modulated by phase modulation (QPSK), Orthogonal Frequency Division Multiplexing (OFDM) and Frequency Hopping Spread Spectrum (FHSS) modulation schemes. They are also compared to traditional binary Kasami codes modulated by BPSK. An underwater acoustic propagation model has been used to assessed the aforementioned schemes, to which the Doppler effect modeling has been also incorporated.

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Section: Underwater Propagation Modelmentioning

confidence: 99%

Doppler resilience evaluation of different encoding techniques for underwater acoustic ranging systems

Murano

Perez-Rubio

Aparicio

et al. 2019

2019 24th IEEE International Conference on Emerging Technologies and Factory Automation (ETFA)

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“…In this experiment we compare the results of the embedded frequency analysis with the calculation based on the third-party software [13]. …”

Section: Verification and Validationmentioning

confidence: 99%

Frequency Analysis of Sound Propagation Based on Direct Simulation

Ji¹,

Xu²,

Li³

et al. 2017

dtcse

Self Cite

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Abstract. The time domain direct simulation to the sound propagation has multiple advantages on adapting to complicated boundary conditions or applying on high performance computers, but it does not provide frequency information explicitly. However in the studies of ocean acoustics, underwater military applications and their numerical simulations, the frequency analysis of sound waves plays a much more significant role than the direct time domain results. For these reason we present a frequency analysis technique embedded to the direct finite volume method (FVM) simulation of the sound propagation using OpenFOAM. In this paper we also test the accuracy and efficiency of the embedded technique by solving the sound propagation in an ideal wedge-shaped wave guide. The results of the experiments validated the embedded technique and the improvements comparing with the post-processing frequency analysis.

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“…erefore, the studies are significant and worthy of attention. For instance, some scholars investigated the rules of sound propagation in shallow water waveguides [20][21][22][23][24]. Meanwhile, some research studies on vector signal processing were also presented [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

A Prediction Method for Acoustic Intensity Vector Field of Elastic Structure in Shallow Water Waveguide

Wang

Yang

Shi

2020

Shock and Vibration

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Compared with scalar sound field, vector sound field explained the spatial structure of sound field better since it not only presents the sound energy distribution but also describes the sound energy flow characteristics. Particularly, with more complicated interaction among different wavefronts, the vector sound field characteristics of an elastic structure in a shallow water waveguide are worthy of studying. However, there is no reliable prediction method for the vector sound field of an elastic structure with a high efficiency in a shallow water waveguide. To solve the problem, transfer functions in the waveguide have been modified with some approximations to apply for the vector sound field prediction of elastic structures in shallow water waveguides. The method is based on the combined wave superposition method (CWSM), which has been proved to be efficient for predicting scalar sound field. The rationality of the approximations is validated with simulations. Characteristics of the complex acoustic intensity, especially the vertical components are observed. The results show that, with constructive and destructive interferences in the depth direction, there could be quantities of crests and vortices in the spatial structure of time-dependent complex intensity, which manifest a unique dynamic characteristic of sound energy. With more complicated interactions among the wavefronts, a structure source could not be equivalent to a point source in most instances. The vector sound field characteristics of the two sources could be entirely different, even though the scalar sound field characteristics are similar. Meanwhile, source types, source parameters, ocean environment parameters, and geo parameters may have influence on the vector sound field characteristics, which could be explained with the normal mode theory.

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Direct FVM Simulation for Sound Propagation in an Ideal Wedge

Cited by 5 publications

References 19 publications

Doppler resilience evaluation of different encoding techniques for underwater acoustic ranging systems

Doppler resilience evaluation of different encoding techniques for underwater acoustic ranging systems

Frequency Analysis of Sound Propagation Based on Direct Simulation

A Prediction Method for Acoustic Intensity Vector Field of Elastic Structure in Shallow Water Waveguide

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