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Prediction of Space Vehicle Thermal Characteristics.

AD472558

Publication Date	1965
Personal Author	Bevans, J. T.; Ishimoto, T.; Loya, B. R.; Luedke, E. E.
Page Count	176
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. (Author)
Keywords	Spacecraft Thermal properties Temperature control Thermal Thermal conductivity Joints Mounting brackets Wave propagation Infrared spectra Mathematical prediction Bolted joints Space Environmental tests Performance(Engineering) Correlation techniques Model tests Computer programming Mathematical
Source Agency	Non Paid Delimited ADS
NTIS Subject Category	84C - Manned Spacecraft
Corporate Authors	Trw Systems Redondo Beach Calif
Document Type	Technical Report
Title Note	Technical rept.
NTIS Issue Number	197716
Contract Number	AF 33(615)-1725

Prediction of Space Vehicle Thermal Characteristics.

Prediction of Space Vehicle Thermal Characteristics.
AD472558

Publication Date	1965
Personal Author	Bevans, J. T.; Ishimoto, T.; Loya, B. R.; Luedke, E. E.
Page Count	176
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. (Author)
Keywords	Spacecraft Thermal properties Temperature control Thermal Thermal conductivity Joints Mounting brackets Wave propagation Infrared spectra Mathematical prediction Bolted joints Space Environmental tests Performance(Engineering) Correlation techniques Model tests Computer programming Mathematical
Source Agency	Non Paid Delimited ADS
NTIS Subject Category	84C - Manned Spacecraft
Corporate Authors	Trw Systems Redondo Beach Calif
Document Type	Technical Report
Title Note	Technical rept.
NTIS Issue Number	197716
Contract Number	AF 33(615)-1725