Launch vehicle attitude control using sliding mode control and observation techniques.

*(English)*Zbl 1254.93057Summary: In determining flight controls for launch vehicle systems, several uncertain factors must be taken into account, including a variety of payloads, a wide range of flight conditions and different mission profiles, wind disturbances and plant uncertainties. Crewed vehicles must adhere to human rating requirements, which limit the angular rates. Sliding mode control algorithms that are inherently robust to external disturbances and plant uncertainties are very good candidates for improving the robustness and accuracy of the flight control systems. Recently emerging Higher Order Sliding Mode (HOSM) control is even more powerful than the classical Sliding Mode Controls (SMC), including the capability to handle systems with arbitrary relative degree. This paper proposes sliding mode launch vehicle flight controls using classical SMC driven by the Sliding Mode Disturbance Observer (SMDO) and higher-order multiple and single loop designs. A case study on the SLV-X Launch Vehicle studied under a joint DARPA/Air Force program called the Force Application and Launch from CONtinental United States (FALCON) program is shown. The intensive simulations demonstrate efficacy of the proposed HOSM and SMC-SMDO control algorithms for launch vehicle attitude control.

##### MSC:

93B12 | Variable structure systems |

93B07 | Observability |

70P05 | Variable mass, rockets |

93C15 | Control/observation systems governed by ordinary differential equations |

##### Keywords:

flight controls; launch vehicle systems; sliding mode control algorithms; higher order sliding mode (HOSM) control; sliding mode disturbance observer (SMDO)
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\textit{J. E. Stott} and \textit{Y. B. Shtessel}, J. Franklin Inst. 349, No. 2, 397--412 (2012; Zbl 1254.93057)

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