Loading...
Please wait, while we are loading the content...
Similar Documents
Some Useful Innovations with Trasys and Sinda-85
| Content Provider | Semantic Scholar |
|---|---|
| Author | Amundsen, Ruth M. |
| Copyright Year | 1993 |
| Abstract | Ruth M. AmundsenNational Aeronautics and Space AdministrationLangley Research CenterHampton, VA 23681SUMMARYSeveral innovative methods have been used to allow more efficient and accurate thermal analysisusing SINDA-85 and TRASYS, including model integration and reduction, planetary surface calculations,and model animation. Integration with other modeling and analysis codes allows an analyst to import ageometry from a solid modeling or computer-aided design (CAD) software package, rather than buildingthe geometry "by hand." This is more efficient as well as potentially more accurate. However, the use ofsolid modeling software often generates large analytical models. The problem of reducing large models hasbeen elegantly solved using the response of the transient derivative to a forcing step function. The thermal analysis of a lunar rover implemented two unusual features of the TRASYS/SINDAsystem. A little-known TRASYS routine SURFP calculates the solar heating of a rover on the lunar sur-face for several different rover positions and orientations. This is used not only to determine the rovertemperatures, but also to automatically determine the power generated by the solar arrays. The animationof transient thermal results is an effective tool, especially in a vivid case such as the 14-day progress of thesun over the lunar rover. An animated color map on the solid model displays the progression of tempera-tures.INTRODUCTIONIn many industries there has recently been a concerted movement toward "quality management"and the issue of how to accomplish work more efficiently. Part of this effort is focused on concurrentengineering: the idea of integrating the design and analysis processes so that they are not separate, sequen-tial processes (often involving design rework due to analytical findings) but instead form an integrated sys-tem with smooth transfers of information. Specific examples of concurrent engineering methods beingcarried out at NASA Langley Research Center (LaRC) are: integration of thermal, structural and opticalanalyses to predict changes in optical performance based on thermal and structural effects; integration ofthe CAD design process with thermal and structural analyses; and integration of thermal analysis with ani-mation to show the thermal response of a system as an active color map -- a highly effective visual indica-tion of heat flow.Electronic integration of design and analysis processes was achieved and refined during the devel-opment of an optical bench for a laser-based aerospace experiment. One of the driving requirements forany complex optical system is its alignment stability under all conditions. Accurate predictions of opticalbench or test bed deflections are necessary to calculate beam paths and determine optical performance.Another requirement that is increasingly demanded of any analysis process is to do it faster and better;create a more streamlined process and include all known variables to produce the best possible predictions.These goals can be accomplished by using an integrated process to accomplish design and all analyses.This integrated analysis process has been built around software that was already in use by designers andanalysts at LaRC. The PATRAN |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://techreports.larc.nasa.gov/ltrs/PDF/conf-5-tfaw.pdf |
| Alternate Webpage(s) | http://www.cs.odu.edu/~mln/ltrs-pdfs/conf-5-tfaw.pdf |
| Alternate Webpage(s) | https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20040129643.pdf |
| Alternate Webpage(s) | https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19940019174.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
