Accession Number : AD0472558


Title :   PREDICTION OF SPACE VEHICLE THERMAL CHARACTERISTICS


Descriptive Note : Technical rept.


Corporate Author : TRW SYSTEMS GROUP REDONDO BEACH CA


Personal Author(s) : Bevans, J T ; Ishimoto, T ; Loya, B R ; Luedke, E E


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/472558.pdf


Report Date : Aug 1965


Pagination or Media Count : 191


Abstract : The first phase of a program to improve the prediction of spacecraft thermal performance is reported. The study has consisted of measuring actual joint thermal conductance, correlation of the measured joint conductance, programming an improved method of thermal radiation analysis, and performing an experimental comparison of predicted radiation exchange for a simple geometrical system. Three types of structural and three sizes of component mounting joints were tested and the conductances measured. A successful method of correlation was developed for the unfilled component mounting joints. A method of radiation analysis has been programmed which uses directional thermal radiation properties and accounts for the specularity and/or diffuseness of these properties. The results of this program can be readily incorporated into most existing thermal analysis programs. The user has the choice of the specular, the diffuse, or the specular-diffuse assumption. The prediction of radiation exchange using these assumptions for simple geometrical arrangements has been compared to experiment. Although the results were within the over-all experimental tolerances, further improvement in the predicted values is believed possible.


Descriptors :   *THERMAL PROPERTIES , *SPACECRAFT , PERFORMANCE(ENGINEERING) , COMPUTER PROGRAMMING , MATHEMATICAL PREDICTION , WAVE PROPAGATION , MODEL TESTS , THERMAL CONDUCTIVITY , ENVIRONMENTAL TESTS , TEMPERATURE CONTROL , CORRELATION TECHNIQUES , INFRARED SPECTRA , JOINTS , MOUNTING BRACKETS , BOLTED JOINTS


Subject Categories : Thermodynamics
      Unmanned Spacecraft


Distribution Statement : APPROVED FOR PUBLIC RELEASE