# NASA Technical Reports Server (NTRS) 19930004203: TRASYS form factor matrix normalization

A method has been developed for adjusting a TRASYS enclosure form factor matrix to unity. This approach is not limited to closed geometries, and in fact, it is primarily intended for use with open geometries. The purpose of this approach is to prevent optimistic form factors to space. In this method, nodal form factor sums are calculated within 0.0

Author: NASA Technical Reports Server (NTRS)

Source: https://archive.org/

## Teaser

N9.3-13391 TRASYS Form Factor Glenn Matrix Normalization T.
Tsuyuki- Jet Propulsion Laboratory California Institute of Technology Pasadena, California 91109 SUMMARY A method has been This approach developed for adjusting is not limited to closed a TRASYS geometries, enclosure and in fact, form factor matrix it is primarily intended with open geometries. The purpose of this approach is to prevent optimistic space. In this method, nodal form factor sums are calculated within 0.05 TRASYS, although deviations as large employed to distribute the difference with method, a comparison this radiation conductors. Exterior eases, nodes predictions when compared be acceptable, the nodes. with cold the form These temperatures results computation analyzed determined. for the hot and cold while indicate error interior nodes that temperature is lumped into the to space. NOMENCLATURE gi area AU astronomical BCS DDA block coordinate system dual-drive actuator FFCAL form FFRATL maximum internodal distance ratio of ith node F_ GLL form GMM geometric factor Galileo - Technical Group units factor calculation Leader, segment subelement from node within distance TRASYS to average i to node j Project math Cassini model Thermal 71 Engineering Group is for calculating were 30C approach, a process has been approach for use form factors to of unity using then, example as 7-C and standard factor and a standard case as large 0°C to 5-C. if the A specific with hot and from biased may performed differences differences can be artificially factors was temperature temperature form amongst In this comparison, exhibited respectively demonstrated individual and as 0.10 to unity. internodal subelement t HGA LGA MLI NELCT PWS Si S-C TMM TRASYS high gain low gain antenna antenna multilayer insulation number of subelements used in Nusselt unit sphere method plas...