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Research Papers: Thermal Systems

Long-Term Evolution of SCD-1 Satellite Temperatures Based on Comparative Analysis of Telemetric Data Measured in Orbit

[+] Author and Article Information
Andreia F. S. Genaro

Coordenação Geral de Engenharia e Tecnologia
Espaciais (ETE)—Instituto Nacional de
Pesquisas Espaciais (INPE) (Space Engineering
and Technology Coordination—Brazilian
National Institute for Space Research),
Avenida dos Astronautas,
1758 Jardim da Granja,
São José dos Campos,
São Paulo CEP 12227-010, Brazil
e-mail: andreia.sorice@inpe.br

Ezio C. Garcia

Professor
Divisão de Engenharia Mecânica-Aeronáutica
(IEM)—Instituto Tecnológico de Aeronáutica
(ITA) (Mechanics-Aeronautics Division—
Technological Institute of Aeronautics),
Praça Marechal-do-Ar Eduardo Gomes,
50-Vila das Acácias,
São José dos Campos,
São Paulo CEP 12228-900, Brazil
e-mail: ezio@ita.br

Issamu Muraoka

Professor
Coordenação Geral de Engenharia e Tecnologia
Espaciais—Instituto Nacional
de Pesquisas Espaciais,
de Pesquisas Espaciais (INPE) (Space
Engineering
and Technology Coordination—Brazilian
National Institute for Space Research),
Avenida dos Astronautas,
1758 Jardim da Granja,
São José dos Campos,
São Paulo CEP 12227-010, Brazil
e-mail: issamu.muraoka@inpe.br

Kevin E. de Conde

Divisão de Engenharia Mecânica e
Aeronáutica—Instituto Tecnológico
de Aeronáutica,
(ITA) (Mechanics-Aeronautics Division—
Technological Institute of Aeronautics),
Praça Marechal-do-Ar Eduardo Gomes,
50-Vila das Acácias,
São José dos Campos,
São Paulo CEP 12228-900, Brazil
e-mail: kevin@ita.br

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received January 15, 2015; final manuscript received March 11, 2016; published online April 19, 2016. Editor: Portonovo S. Ayyaswamy.

J. Heat Transfer 138(7), 072803 (Apr 19, 2016) (10 pages) Paper No: HT-15-1034; doi: 10.1115/1.4033084 History: Received January 15, 2015; Revised March 11, 2016

This paper presents results of the research investigation regarding the causes for temperature variation of the SCD-1 (data-collection satellite) by analyzing its thermal behavior evolution throughout 13 years in orbit. SCD-1, the first satellite designed and built in Brazil, was launched in 1993 and is still in operation. A mathematical model has been developed to simulate thermal behavior of SCD-1 in orbit, which was used as a working tool during project design phase, and is presented here. Temperatures of SCD-1 in orbit have been monitored and recorded in the Control and Tracking Center (São José dos Campos, SP, Brazil) since its launch. An analysis carried out at the mission’s beginning showed that all the temperatures were within the ranges predicted in model. Over the years, the battery, which is the most temperature-sensitive equipment in the satellite, had an increase in temperature approaching upper limit. A method has been developed to investigate the causes of this upswing in which an optimization routine linked to the mathematical model corrects a selected set of parameters in order to adjust the theoretical temperature values to the experimental values. By means of this methodology, data from SCD-1 were analyzed from 1995 to 2005 period and it was concluded that the rise in temperature was caused by an increase in internal battery heat dissipation and absorptivity in solar spectrum of some of the external satellite shielding, both consequences of a long-term degradation.

Copyright © 2016 by ASME
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References

Figures

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Fig. 1

Flowchart with the proceeding to obtain comparative curves

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Fig. 2

Difference between calculated and measured temperatures

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Fig. 5

Definition for the orientation angles of the satellite and position of the sun in relation to the orbit

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Fig. 3

Optimization process flowchart

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Fig. 4

Data-collection satellite 1: (a) SCD-1 structure, (b) SCD-1 schematic configuration, and (c) SCD-1 orbit

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Fig. 6

Lower panel temperatures on June 22–23, 1995

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Fig. 12

Evolution of the difference between the theoretical and experimental temperatures, calculated by Eq. (2), in the external structural panels.

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Fig. 13

Evolution of the difference between the theoretical and experimental temperatures, calculated by Eq. (2), in the power supply subsystem equipment.

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Fig. 14

Original shunt, PCU, and battery dissipation profile

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Fig. 15

Correction factors for solar absorptivity of lower, side, and upper panels

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Fig. 16

Correction factors for solar absorptivity of shunt and battery radiators

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Fig. 17

Correction factors for shunt, PCU, and battery internal dissipation

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Fig. 18

Solar absorptivity of the upper panel in function of incidence angle

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Fig. 7

Side panel temperatures on June 22–23, 1995

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Fig. 8

Upper panel (and equipment mounted on it) temperatures on June 22–23, 1995

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Fig. 9

Lower panel temperatures on Dec. 22, 2005

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Fig. 10

Upper panel (and equipment mounted on it) temperatures on Dec. 22, 2005

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Fig. 11

Side panel temperatures on Dec. 22, 2005

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