Abstract
A novel roll-channel attitude control scheme using a combination of single-gimbal control moment gyros and a reaction control system is proposed, providing sufficient control torque during the whol...
Highlights
Attitude control is of great significance to a reentry vehicle as it is used to implement the attitude stabilization and realize the attitude commands generated by the onboard guidance system
The reasons can be stated as follows: as the singlegimbal control moment gyros (SGCMGs) used in the hardware-in-the-loop simulation (HILS) system are developed as rapid prototypes, some as the roll-channel attitude actuators
They may encounter the problem of saturation singularity, which entails the use of reaction control system (RCS) as the complementary actuator
Summary
Attitude control is of great significance to a reentry vehicle as it is used to implement the attitude stabilization and realize the attitude commands generated by the onboard guidance system. In section ‘‘Attitude control scheme for reentry vehicles,’’ the roll-channel attitude controller is proposed, the control torque allocator based on fuzzy reasoning is developed, the response speed of the SGCMG is evaluated, and the modulation method of RCS is designed. External disturbance torques may cause saturation of the angular momentum of the scissored pair of SGCMGs, which is referred to as the saturation singularity and disables the attitude control along the roll axis. The control system and control method are designed to realize the stability of the roll angle based on STT control, which is expressed as follows lim g = 0 To this end, attitude control and control allocation laws are developed in this study for the system of compound actuators, which comprises a pair of SGCMGs and an RCS.
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