دورية أكاديمية
Sound Scattering Characteristics of Oxygen Cylinder for Open Breathing Diver
| العنوان: | Sound Scattering Characteristics of Oxygen Cylinder for Open Breathing Diver |
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| المؤلفون: | ZHANG Peizhen, LIN Fang |
| المصدر: | Shanghai Jiaotong Daxue xuebao, Vol 56, Iss 6, Pp 764-771 (2022) |
| بيانات النشر: | Editorial Office of Journal of Shanghai Jiao Tong University, 2022. |
| سنة النشر: | 2022 |
| المجموعة: | LCC:Engineering (General). Civil engineering (General) LCC:Chemical engineering LCC:Naval architecture. Shipbuilding. Marine engineering |
| مصطلحات موضوعية: | finite element method (fem), distance-angle echo in time domain, frequency-angle spectrum, bright spot model, circumferential wave, open breathing diver, Engineering (General). Civil engineering (General), TA1-2040, Chemical engineering, TP155-156, Naval architecture. Shipbuilding. Marine engineering, VM1-989 |
| الوصف: | This paper aims to solve the problem of the oxygen cylinder contribution to the overall scattering intensity of the open breathing diver, which is the basis for mastering the accurate prediction and identification of the diver. A two-dimensional finite element axisymmetric model of 3D-object with non-axisymmetric excitation is constructed. The numerical solution to the far-field frequency characteristics of the acoustic scattering by the object with different azimuths is obtained by using the acoustic-solid coupling multi-physical interface in frequency domain. The reason and the estimation formula of the bright fringe at the resonance frequency are given. Under the assumption of the linear acoustics, the numerical solution to finite element method (FEM) is taken as the system function, and the linear frequency modulation signal with the same bandwidth is taken as the input signal of the system. The echo simulation in time domain can be obtained based on the convolution theorem. Combining the bright spot model and the elastic circumferential wave theory, the precise prediction model of the distance-angle echo in time domain is proposed. The results show that the main factors that affect the strength of the echo include the mirror reflection and the angular reflection. The additional bright spots and circumferential waves generated by the fine structures such as valves and spherical cap have a non-negligible influence on the frequency response characteristics in different azimuths. The validity of the echo prediction and resonance frequency characteristics is verified by the lake experiment in monostatic mode. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | Chinese |
| تدمد: | 1006-2467 |
| العلاقة: | http://xuebao.sjtu.edu.cn/article/2022/1006-2467/1006-2467-56-6-764.shtmlTest; https://doaj.org/toc/1006-2467Test |
| DOI: | 10.16183/j.cnki.jsjtu.2021.078 |
| الوصول الحر: | https://doaj.org/article/5df35ff8b00f42c8915fd59f4007b201Test |
| رقم الانضمام: | edsdoj.5df35ff8b00f42c8915fd59f4007b201 |
| قاعدة البيانات: | Directory of Open Access Journals |
| تدمد: | 10062467 |
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| DOI: | 10.16183/j.cnki.jsjtu.2021.078 |