| Alpha Magnetic Spectrometer(AMS)is a kind of physics experimental equipment which is located on the International Space Station(ISS)to detect high energy particles in the universe.The purpose of AMS is to better understand the origin of the universe.AMS is running in low earth orbit,facing a very complex space thermal environment.Therefore,in order to ensure the stable operation and service life of AMS,it is necessary to analyze its thermal environment influence factors and put forward corresponding temperature control measures.In this paper,the thermal balance and external heat flux of AMS are analyzed theoretically,and the spherical coordinates are established to correlate the temperature changes between the ISS and AMS by mathematical model.Based on the thermal data of AMS in orbit for many years,the operation law of AMS in orbit is analyzed,and the thermal effects of three typical operations of ISS on alpha magnetic spectrometer are analyzed.Through data analysis,it is found that among the three typical operations of ISS,the thermal environment of AMS is most affected by flight attitude adjustment.In order to further understand this effect,SINDA/FLUINT software is used to simulate the external heat flux and temperature variation of AMS under different δYaw of ISS flight attitude,and the method of rotating the starboard main radiator of ISS to control the temperature of AMS is proposed and verified.Through the study,it is found that the attitude adjustment of ISS with the change of δYaw angle has a significant impact on the external heat flux of AMS,especially in the extreme β angle range.Decreasing the value of δYaw will lead to the rapid increase of the external heat flux of AMS main radiators,and the maximum external heat flux of AMS main radiators is 479.28W/m2.For AMS,the change of the δYaw of the ISS flight attitude will cause significant temperature response to the AMS,and even cause temperature anomaly.Therefore,the thermal response of AMS under different δYaw angles in the extreme β angle interval is numerically simulated and analyzed.The results show that the probability of temperature anomaly caused by ISS flight attitude adjustment is 66.7%,and the minimum value of δYaw angle that can cause temperature anomaly is-19° at β=-75° on the temperature sensor PDS-D,which could be eliminated by rotating the starboard main radiator of ISS.The rotating operation of ISS starboard main radiator can compensate the thermal environment of the wake side of AMS obviously,and its influence varies with the change of δYaw angle.The rotation of the ISS starboard main radiator can completely relieve 67.6%of the abnormal temperature caused by the ISS attitude adjustment.The occurrence time of abnormal temperature can be delayed. |
