Retrofiring control method via combination of a 1DoF gimbaled thrust vector control and spin-stabilization

Author:

Kouhi Hamed1,Kabganian Mansour1,Shahravi Morteza2,Fani Saberi Farhad3

Affiliation:

1. Department of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iran

2. Space Research Institute, Tehran, Iran

3. Space Science and Technology Institute, Amirkabir University of Technology, Tehran, Iran

Abstract

In impulsive orbital maneuvers, thrust vector misalignment from the center of mass is the serious source of disturbance torque. A high capacity attitude control system is needed to compensate the mentioned large exogenous disturbance. In this paper a new retrofiring control method is proposed and studied which is based on the combination of a 1DoF gimbaled thrust vector control and spin-stabilization method. Spin-axis stabilization and disturbance rejection are considered as two important attitude control objectives. The nonlinear two-body dynamics of a small spacecraft is derived in which dynamical interaction between the nozzle and the body is significant. Reaction control system is not used and the only active control part is a 1DoF gimbal. The spacecraft design efficiency is very important; therefore, the H performance and control gain norm are chosen as two conflicting cost function in the Pareto front multiobjective optimization. Many Pareto fronts are given for some ranges of two favorable parameters: (1) spin rate and (2) spin-axis moment of inertia. Optimization variables are the closed-loop system poles. Moreover, poles region constraint is employed to obtain a well-damped transient response. From the perspective of performance and design efficiency, the optimization results give many attractive outcomes. The resulting system is an efficient design for a small spacecraft. Furthermore, numerical simulations are included to confirm the optimization results and illustrate the superiority of the proposed method compared to the only spin-stabilization.

Publisher

SAGE Publications

Subject

Mechanical Engineering,Aerospace Engineering

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