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[项目新闻] 【物理学】Acoustics@home

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发表于 2018-4-16 21:01:08 | 显示全部楼层 |阅读模式
计算平台:Windows/Linux
硬件:CPU
项目网址:http://www.acousticsathome.ru/boinc/
项目主办方:V.I. Ilichev Pacific Oceanological Institute, Far Eastern Federal University, Matrosov Institute for System Dynamics and Control Theory, A.A. Kharkevich Institute for Information Transmission Problems, Dorodnicyn Computing Centre
项目介绍:
大致是研究水下声学问题的,有空我详细翻译一下试试。
What is Acoustics@home?
Acoustics@home is a BOINC-based volunteer computing project aimed at solving inverse problems in underwater acoustics. You can contribute to our research by running a free program on your computer.
In underwater acoustics the notion of geoacoustic inversion refers to a collection of techniques that can be used for the reconstruction of medium parameters. The medium parameters are usually understood as the sound speed profile in water (i.e., the dependence of the sound speed on the depth) and the sound speed and density in the sea bottom sediment layers. Medium parameters reconstruction is of great importance for problems of underwater communication and for the development of underwater navigation systems.

While normally measurements for the geoacoustic inversion are performed using expensive receiver arrays, recently it was shown that single-hydrophone recording of a broadband pulse signal can be also successfully used for estimating the medium parameters.

The method of geoacoustic inversion developed in our study is based on using modal dispersion data. Waveguide dispersion is usually induced by the difference in group velocities of propagation of normal waves of different mode numbers at different frequencies. By using special algorithms of the frequency-time analysis of signals, it is possible to filter out the modal components of a pulse signal from its time series recorded by a single hydrophone. The implementation of this method in practice can be thought of as a solution of an optimization problem in a (very large) discrete search space, and every evaluation of the cost function requires numerous solutions of an acoustic spectral problem. Thus, the whole computational burden can be easily divided into a large number of relatively simple independent tasks, which can be solved using volunteer computing.




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参与人数 1基本分 +60 收起 理由
zichen + 60 辛苦了!

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 楼主| 发表于 2018-4-16 21:06:17 | 显示全部楼层

2018-04-15: Acoustics@home, Paper at Open Engineering

A new paper was published
Oleg Zaikin, Pavel Petrov, Mikhail Posypkin, Vadim Bulavintsev and Ilya Kurochkin. A volunteer computing project for solving geoacoustic inversion problems // Open Engineering. 2017. Volume 7, Issue 1. pp. 363-370
This paper describes Acoustics@home as well as results obtained in it in 2017.










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这项目还有好几篇文章,收到成果汇总里了~
2018-04-15: Acoustics@home, 在Open Engineering 上发表了文章
我们新发表了一篇研究论文:
Oleg Zaikin, Pavel Petrov, Mikhail Posypkin, Vadim Bulavintsev and Ilya Kurochkin. A volunteer computing project for solving geoacoustic inversion problems // Open Engineering. 2017. Volume 7, Issue 1. pp. 363-370
https://www.degruyter.com/view/j ... 0040.xml?format=INT
这篇论文介绍了Acoustics@home 项目,并展示了我们在2017年获得的成果。
 楼主| 发表于 2018-4-21 15:41:45 | 显示全部楼层

2018-04-20: Acoustics@home, New application version

Application version 0.18 was released:
- some memory leaks were fixed;
- some unnecessary data files were removed;
- an additional compatibility with Windows XP was added.
Also, the work generator was enabled again.










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2018-04-20: Acoustics@home, 新版计算程序
新版本0.18发布:
·修复了内存泄漏问题
·去掉了一些没用的数据文件
·增加了对winXP的兼容性
另外,任务生成器又可以开工了

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参与人数 1维基拼图 +5 收起 理由
zhouxiaobo + 5 wiki +1

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发表于 2018-8-5 13:41:11 | 显示全部楼层
On the current experiment14 May 2018, 9:32:02 UTC
In the current experiment, we study the accuracy of the sound speed profile reconstruction in a shallow-water waveguide using a dispersion-based geoacoustic inversion scheme. This problem was transformed into a problem of black-box minimization of a certain mismatch function. A sound speed profile is considered a piecewise-linear function with fixed uniformly-spaced nodes. At these nodes, the values of sound speed are obtained in the course of inversion. The main novelty is that the depths of the sound speed profile nodes are also considered inversion parameters. Note, that in the previous experiment held in Autumn 2017 the depths were constant.



当前的实验
2018-05-14


在目前的实验中,我们利用基于色散的地-声反演方案研究了浅水波导声速剖面重构的精度。这个问题被转化为特定的不匹配函数的黑盒最小化问题。
声速剖面被认为是具有固定均匀间隔节点的分段线性函数。在这些节点上声速值由反演过程得到。
本次实验的创新点是:声速剖面节点的深度也认为是反演参数的函数。注意到在 2017 年秋季实验中,我们认为深度是恒定的。


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参与人数 2基本分 +30 维基拼图 +15 收起 理由
zhouxiaobo + 10 wiki +1
昂宿星团人 + 30 + 5 很给力!

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 楼主| 发表于 2018-9-18 23:13:57 | 显示全部楼层

2018-09-15: Acoustics@home, Report at GRID'2018

The report 'Application of BOINC-based volunteer computing for comparison of the geoacoustic inversion algorithms efficiency.' was made in Dubna at the conference GRID'2018. In this report, results obtained in Acoustics@home are discussed. The presentation is available online









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2018-09-15: Acoustics@home,在GRID'2018 上的报告
在俄罗斯莫斯科州杜布纳市(Dubna)举办的GRID'2018 研讨会上,项目代表作了题为《基于BOINC的志愿计算平台在比较多种地声反演算法效率上的应用》的报告。报告中讨论了Acoustics@home项目得到的一些结果。演讲的PPT在这里可以看到(英文)。
发表于 2021-3-8 09:31:13 | 显示全部楼层
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