Abstract A pressure control method that incorporates parameter adaptation has been devised for the pressure control system of pintle solid rocket motors, which exhibit notable nonlinearities and uncertainties in parameters. Firstly, the mathematical relationship between pressure and pintle displacement is derived using the zero-dimensional interior ballistic model., and the state space equation is deduced by incorporating the dynamics of motor inertia load. Secondly, by capitalizing on the robustness of robust control, the parameter identification capabilities of adaptive control, and the rigor of Lyapunov stability theory, the proposed approach enables precise control of the pintle position while effectively addressing uncertainties, thereby enhancing the overall performance and stability of the system. Finally, the aforementioned theoretical framework has been validated through rigorous numerical simulations. The findings demonstrate a notable enhancement in the pressure response speed of the adaptive robust controller, with improvements of 10.01 % and 13.16 %, 0.03 % and 1.54 %, 0.06 % and 22.39 % in different orders of magnitude of free volume as compared to the robust controller and PID controller, respectively. Moreover, it is evident that the adaptive robust controller relies on the accuracy of the model. The applied controller demonstrates notable advantages in terms of stability, robustness, and accuracy, thereby substantially enhancing the overall performance of the pressure control system.
Highlights The state space equation for the pressure of the pintle solid rocket motors is derived. The pressure dynamics equation and the motor inertial load equation are combined. An adaptive robust controller with respect to pressure is designed. The controller response laws for various free volumes, pressure index and characteristic velocity are obtained. The adaptive robust controller exhibits a higher dependence on model accuracy is observed.
Design of nonlinear control method for pressure of pintle solid rocket motor
Acta Astronautica ; 215 ; 296-307
2023-12-04
12 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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