OASES Software for Modeling Seismo-acoustic Propagation in Horizontally Stratified Waveguides

Technology #7549

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OASES
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Inventors
Professor Henrik Schmidt
Department of Mechanical Engineering, MIT
External Link (acoustics.mit.edu)
Managed By
Daniel Dardani
MIT Technology Licensing Officer
Publications
A full wave solution for propagation in multilayered viscoelastic media with application to Gaussian beam reflection at fluid–solid interfaces
The Journal of the Acoustical Society of America, Vol. 77, p. 813 (1985)

Applications

Applications for this technology are found in underwater acoustics and seismology.

Problem Addressed

The previous technologies were generally based on the Thomson-Haskell matrix method, which allows for field calculations for only one source-receiver combination at a time. The calculation of the field as a function of depth and of fields produced by vertical source arrays need several separate runs, with the calculation time being proportional to the number of sources and receivers.

Technology

OASES is a general purpose computer code for modeling seismo-acoustic propagation in horizontally stratified waveguides using wavenumber integration in combination with the Direct Global Matrix solution technique. It is basically an upgraded version of SAFARI, distributed by SACLANTCEN (now NURC).  The OASES Base (Export) Package can be downloaded via anonymous svn/http from the MIT LAMSS repository at  http://lamss.mit.edu/lamss/pmwiki/pmwiki.php?n=Site.Oases

Advantages

  • The model provides a full wave solution for the field generated by a single source as well as for that generated by a vertical source array.
  • It allows the spatial distribution of the acoustic field to be evaluated at least one order of magnitude faster than with existing models based on the Thomson–Haskell solution technique.
  • The computational efficiency of the numerical code is demonstrated by providing exact numerical solutions for the reflectivity pattern associated with narrow ultrasonic beams incident on a fluid–solid interface near the Rayleigh angle.

Versions

A full version of OASES includes the extension to laterally in homogeneous stratifications, 3D seismic sources, the embedded signal processing modules, etc.   As of January 1999, there is a new OASES 3-D program which is  independent software and can be run without purchasing the earlier non-gov funded OASES range dependent version.

You can license the full OASES package, OASES only, or only the OASES 3-D program.  Both commercial and academic licensing options are available. 

Licensing

Use of MIT end-use software requires a license.   Licenses, including academic and research licenses, are typically between MIT and your company, university or institution, and not you (or a faculty member) individually.  You can obtain a license for your company or institution from MIT's Technology Licensing Office.  Please contact the Licensing Officer for a quotation.