Variable structure control of time-delay systems with a simulation study on stabilizing combustion in liquid propellant rocket motors
✍ Scribed by Feng Zheng; Mian Cheng; Wei-Bing Gao
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 699 KB
- Volume
- 31
- Category
- Article
- ISSN
- 0005-1098
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✦ Synopsis
The dynamical model of combustion in liquid propellant rocket motors is an unstable time-delay system. When it is stabilized by alinear state feedback controller, the robustness of the closed-loop system is not satisfactory. In this paper a variable structure control approach to stabilize the combustion is presented. First, the concept of switching functional is introduced, and hence a systematic design method is established for the variable structure control of general time-delay systems. Secondly, the proposed theory is applied to the stabilization of combustion in liquid monopropellant rocket motors. Simulation results show that the robustness of the closed-loop system against variations in time lag 6 and pressure exponent y is considerably improved. Specifically, the controller designed according to the nominal value S = 1.0 can still stabilize the system with 6 = 0, i.e. the system without time delay. This conclusion provides a powerful basis for the reliable design of rocket motor control systems.