Abstract
The heat sink temperature is often set in a semi-empirical way based on steady-state temperatures . As a result, the entrance parameters of the heat sink working fluid are often too conservative, and the rate of temperature rise is difficult to control. In this paper, transient thermal models for each component of the heat sink temperature regulation system are established. Then they are programmed into a dynamic simulation model by using Matlab/Simulink as the thermal control algorithm.It is shown that the model can accurately reflect the dynamic and steady state characteristics of the heat sink temperature regulation system, and can provide guidance for the selection of control strategies and working fluid parameters in the thermal vacuum test.
Highlights
The thermal vacuum test is to assess the performances and to expose the design and process problems of spacecraft components, subsystems or the whole spacecraft under extreme hot and cold vacuum conditions
The use of heat sink temperature regulation has the advantages of economy, convenient operation, fast cooling, and strong adaptability to complex shape and moving parts
Due to the large lag caused by the heat capacity of the heat sink, the inlet parameters obtained by steady state calculation are usually much more conservative than the actual conditions during the test
Summary
The thermal vacuum test is to assess the performances and to expose the design and process problems of spacecraft components, subsystems or the whole spacecraft under extreme hot and cold vacuum conditions. The use of heat sink temperature regulation has the advantages of economy, convenient operation, fast cooling, and strong adaptability to complex shape and moving parts. It is an important development direction of spacecraft component level thermal vacuum test[1-3]. In the process of heat sink temperature regulation, the initial temperature, the final temperature and the cooling time usually are taken to be the known conditions. Due to the large lag caused by the heat capacity of the heat sink, the inlet parameters obtained by steady state calculation are usually much more conservative than the actual conditions during the test. The results show that the established dynamic model and simulation program can reflect the steady and dynamic characteristics of the test article accurately, which is of great significance for the formulation of the test strategy, the selection of test parameters, and the prediction of the test process
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