Passive Thermal Control Design And Experimental Research Of NJUST-1 CubeSat

NJUST-1 CubeSat is a double-unit CubeSat, developed and launched by Nanjing University of Science and Technology. NJUST-1 is a nano-satellite, running on sun synchronous orbit of 490 km altitude, which weigh is 2.2 kg, and envelope shape size is 100 mm* 100 mm* 227 mm. Average power of 4.5 W generated by solar cell array each circle is serious lack, so use passive thermal control measures to fulfill its thermal control task. However, high heat flux density and small thermal inertia bright enormous challenges on thermal control design for nano-satellite. This article carries out passive thermal control design and simulation analysis of NJUST-1 CubeSat, and verifies thermal design through ground thermal balance test and on-orbit test of the satellite. The research content mainly includes the following four aspects:Start with analysis the demands the satellite on thermal control subsystem, and follow the basic principles and main basis of satellite thermal design, considerate comprehensively on satellite thermal design experience both at home and abroad. Put forward the thermal design scheme of NJUST-1 CubeSat.Thermal simulation of NJUST-1 CubeSat is conducted on the basis of the thermal design using I-DEAS TMG software. Establishes the thermal simulation model, then calculates CubeSat orbit, external heat flux, and CubeSat temperature field. Some adjustments are made according to analysis result. With final thermal design measures, temperature field analysis in different working conditions are conducted, simulation results shows that the thermal of all the components in the CubeSat are within the proposed temperature indicators.Heater band is selected to simulate space heat flux, and completes the satellite thermal balance test. Compares the experimental data and simulation data, the deviation between them is within acceptable range, and the temperatures of all parts are in the scope of its temperature indicators.Sensitivity classification and amendment is carried out on the parameters of NJUST-1 CubeSat thermal model, the calculation results of the revised thermal model show better agreement with experimental data, which indicates the fixed parameters can more reflect the test condition. And analyzes the in-orbit temperature data of NJUST-1, by comparing in-orbit temperature, test data and simulation data, deviation between is acceptable, which shows that passive thermal control design of this paper can satisfy the temperature control requirements of NJUST-1.