PID controller tuned using Simulated Annealing for assured crew re-entry vehicle with PWPF thruster firing

An attitude control system is proposed for an assured crew re-entry vehicle, where the control law is based PID controller tuned using Simulated Annealing. The controller designed ensures robustness properties with respect to parametric uncertainties and environmental disturbances. The system state remains in the neighborhood of a reference attitude and the control signal is close to a well-defined equivalent control. To ensure the effectiveness of the system, the PID controller tuned using Simulated Annealing is compared with conventional PID controller results. The reference attitude is obtained in terms of the command angles and the outputs given by the trajectory controller. A pulse width pulse frequency (PWPF) modulator is designed to modulate the thrust torque commanded by the attitude controller. The simulation results show the effectiveness of the proposed method in meeting the various requirement parameters.