Design And Research Of Cubic Satellite Brake Sail Off-track Device

In order to avoid a non-functional Cubesat becoming space debris,this paper studies the Cubesat deorbit technology.It is necessary to use a low-cost drag sail device as an end-of-life disposal which makes the Cubesat deorbit quickly and decreases the threat of collisions and damages to other spacecraft.A off-track mathematical model of the Cubesat is established,and it is found that the deorbit time of a Cubesat is mainly determined by the orbital height,the area-mass ratio,and the launch date.The influence of the above three factors on the deorbit time of Cubesat is analyzed by using the Satellite Tool Kit(STK),and the final development area of the drag sail device is 8 m2.Based on the theoretical analysis results and combined with the design requirements of Cubesat,a independent,modular and highly reliable drag sail device is designed.The drag sail device is mainly composed of a drag sail cabin,a boom deploying mechanism and a shaft locking mechanism.Wherein the boom deploying mechanism provides driving force to deploy the boom by means of the resilient strain energy stored by the boom;The shaft locking mechanism functions as a switch of the drag sail device by suppressing rotation of the central shaft within the boom deploying mechanism.The finite element software ANSYS is used to simulate the boom deploying mechanism,and the statics and modal analysis were carried out.The results show that the deformation and stress of the static response is very small.The structural base frequency is also much higher than 100Hz specified by the design specification.The drag sails and boom of the deorbit device are studied and analyzed.The influence of the space environment on the drag sails is analyzed.Finally,Kapton films with the thickness of 15?m and double-sided aluminum plating are chosen as the brake sail material.According to the structure of the sail cabin,a suitable folding method of sail is determined.The mechanical properties of the boom were analyzed,and the radius of curvature of the tape spring was determined to be 15mm.Beryllium-copper alloy strip was selected as the material of boom,and a tape spring processing device was designed.The performance of the boom was examined to verify the rationality of the processing plant.