Session
Poster Session III
Event Website
https://www.smallsat.org/index
Abstract
This study presents the magnetic substance disturbance torque caused by shape magnetic anisotropy. This magnetic substance disturbance occurs in on-board unsymmetrical magnetic substances, even if the magnetic substance does not have a residual magnetic dipole moment. Although this magnetic substance disturbance torques has not been considered in previous small-sized satellites, in some cases, the strength of the disturbance is stronger than the effect of aerodynamic and solar radiation disturbances. First, this study presents the strength and effects of the magnetic substance disturbance torque in Cubesat satellites: XI-IV and PRISM in the University of Tokyo. Then, the study shows that the strength of the magnetic substance torque caused by an arbitrary-shaped magnetic substance can be expressed as follows: T=M_s B^2 cosθsinθ, where M_s, B, and θ are constant parameter, outer magnetic field, and direction of the outer magnetic field, respectively. Second, the study proposes a method of estimating magnetic substance disturbance using a least squared method in orbit. Finally, the study presents the application of the magnetic substance torque for passive attitude control systems for spacecraft. The proposed formulation and estimation method are indispensable to achieve the precise attitude determination and control in nano- and micro-satellite missions.
Included in
Magnetic Substance Disturbance Torque Caused by Shape Magnetic Anisotropy and its Applications in Small-Sized Satellites
This study presents the magnetic substance disturbance torque caused by shape magnetic anisotropy. This magnetic substance disturbance occurs in on-board unsymmetrical magnetic substances, even if the magnetic substance does not have a residual magnetic dipole moment. Although this magnetic substance disturbance torques has not been considered in previous small-sized satellites, in some cases, the strength of the disturbance is stronger than the effect of aerodynamic and solar radiation disturbances. First, this study presents the strength and effects of the magnetic substance disturbance torque in Cubesat satellites: XI-IV and PRISM in the University of Tokyo. Then, the study shows that the strength of the magnetic substance torque caused by an arbitrary-shaped magnetic substance can be expressed as follows: T=M_s B^2 cosθsinθ, where M_s, B, and θ are constant parameter, outer magnetic field, and direction of the outer magnetic field, respectively. Second, the study proposes a method of estimating magnetic substance disturbance using a least squared method in orbit. Finally, the study presents the application of the magnetic substance torque for passive attitude control systems for spacecraft. The proposed formulation and estimation method are indispensable to achieve the precise attitude determination and control in nano- and micro-satellite missions.
https://digitalcommons.usu.edu/smallsat/2016/Poster3/7
