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Foundation ::
Thermal Tools ::
TRASYS
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TRASYS
Thermal Radiation Analyzer System
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Only the documentation is available for this title
The Thermal Radiation Analyzer System, TRASYS, is a computer software
system with generalized capability to solve the radiation related aspects
of thermal analysis problems. TRASYS computes the total thermal radiation
environment for a spacecraft in orbit. The software calculates internode
radiation interchange data as well as incident and absorbed heat rate data
originating from environmental radiant heat sources. TRASYS provides data
of both types in a format directly usable by other thermal analyzer programs.
One primary feature of TRASYS is that it allows users to write their own driver programs to organize and direct the preprocessor and processor library routines in solving specific thermal radiation problems. The preprocessor first reads and converts the user's geometry input data into the form used by the processor library routines. Then, the preprocessor accepts the user's driving logic, written in the TRASYS modified FORTRAN language. In many cases, the user has a choice of routines to solve a given problem. Users may also provide their own routines where desirable. In particular, the user may write output routines to provide for an interface between TRASYS and any thermal analyzer program using the R-C network concept.
Input to the TRASYS program consists of Options and Edit data, Model data, and Logic Flow and Operations data. Options and Edit data provide for basic program control and user editing capability. The Model data describe the problem in terms of geometry and other properties. This information includes surface geometry data, documentation data, nodal data, block coordinate system data, form factor data, and flux data. Logic Flow and Operations data house the user's driver logic, including the sequence of subroutine calls and the subroutine library.
Output from TRASYS consists of two basic types of data: internode radiation interchange data, and incident and absorbed heat rate data. The flexible structure of TRASYS allows considerable freedom in the definition and choice of solution method for a thermal radiation problem. The program's flexible structure has also allowed TRASYS to retain the same basic input structure as the authors update it in order to keep up with changing requirements.
Among its other important features are the following:
- up to 4000 node problem size capability (3200 under VAX/VMS) with shadowing by intervening opaque or semi-transparent surfaces
- choice of diffuse, specular, or diffuse/specular radiant interchange solutions
- a restart capability that minimizes recomputing
- macroinstructions that automatically provide the executive logic for orbit generation that optimizes the use of previously completed computations
- a time variable geometry package that provides automatic pointing of the various parts of an articulated spacecraft and an automatic look-back feature that eliminates redundant form factor calculations
- capability to specify submodel names to identify sets of surfaces or components as an entity
- subroutines to perform functions which save and recall the internodal and/or space form factors in subsequent steps for nodes with fixed geometry during a variable geometry run
TRASYS carries the NASA case number COS-10040. It was originally released as part of the NASA Cosmic collection.
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