A Neural Network Adaptive Fault-Tolerant Control Method for Launch Vehicles with the Limited Faults

适应有限故障的运载火箭神经网络自适应容错控制

¹ Beijing Institute of Astronautical Systems Engineering, Beijing 100076, China
² China Aerospace Science and Technology Corporation, Beijing 100048, China

Received: 9 September 2019

Abstract

To tolerate the limited faults such as thrust decline or actuator jamming of launch vehicles, an adaptive fault-tolerant control method based on radial basis function neural network (RBFNN) is proposed in this paper. The method is based on a limited faults dynamics model, and the baseline controller is designed based on the pole placement, using RBFNN to online identify and compensate the fault parameters and uncertain disturbances in the model. Then an adaptive fault-tolerant control law is designed based on Lyapunov theory. The simulation results show that the proposed adaptive control method can effectively ensure the attitude stability as well as control accuracy under the limited faults of launch vehicles, compared with the traditional PD control method.

摘要

针对运载火箭推力下降或伺服机构卡死等有限故障，提出了一种基于径向基神经网络（radial basis function neural network，RBFNN）的自适应容错姿态控制方法。该方法在有限故障动力学模型基础上，采用极点配置设计基线控制器，使用RBFNN在线辨识模型的故障参数和不确定干扰，最后基于Lyapunov理论设计自适应容错控制律对故障模型和干扰进行补偿。仿真结果表明，在有限故障工况下，该方法与传统PD方法相比，对故障具有较好的自适应能力，并能满足姿态稳定和控制精度要求。

1. Li Hong. The Developing Roadmap of Intelligent Launch Vehicle[J]. Astronautical Systems Engineering Technology, 2017 (1): 13– 19 [Article](in Chinese) [Google Scholar]
2. Chang Wuquan, Zhang Zhiguo. Analysis of Fault Modes and Applications of Self-Adaptive Guidance Technology for Launch Vehicle[J]. Journal of Astronautics, 2019, 40 (3): 302– 309 [Article](in Chinese) [Google Scholar]
3. Cheng Tangming, Li Jiawen, Tang Guojin. Reconstruction of Attitude Control System of Launch Vehicle Based on Linear Programming under Servo Mechanism Fault[J]. Journal of National University of Defense Technology, 2017, 39 (1): 51– 57 [Article](in Chinese) [Google Scholar]
4. Cheng Tangming, Li Jiawen, Chen Yu, et al. Extended Multiple Model Adaptive Method for Fault Detection and Diagnosis of Launch Vehicle's Servo Mechanism[J]. Journal of National University of Defense Technology, 2017, 39 (5): 80– 89 [Article](in Chinese) [Google Scholar]
5. Jeb O, Van Z T. Robust, Practical Adaptive Control for Launch Vehicles[C]//AIAA Guidance, Navigation, and Control Conference, Minneapolis, United States, 2012: 45–49 [Google Scholar]
6. Zhu Haiyang, Wu Yansheng, Chen Yu, et al. A Neural Network Fault-Tolerant Control Method for Launch Vehicles with Thrust Decline[J]. Aerospace Control, 2019 (4): 3– 9 [Article](in Chinese) [Google Scholar]
7. Zhao Ziwang, Chen Li. Decentralized Fault-Tolerance Control for Partial Loss of Actuator Effectiveness in Free-Floating Space Robots[J]. Manned Spaceflight, 2016, 22 (1): 39– 44 [Article](in Chinese) [Google Scholar]
8. Wang Ruonan. Neural Network Observer-Based Fault Diagnosis and Tolerant Control for Flight Control Systems[D]. Nanjing: Nanjing University of Aeronautics and Astronautics, 2018(in Chinese) [Google Scholar]
9. Li Wenbo, Wang Dayi, Liu Chengrui. Evaluating Fault Diagnosability of Satellite Attitude Control System[J]. Aerospace Control and Application, 2014, 40 (5): 8– 13 [Article](in Chinese) [Google Scholar]
10. Li Jiawen. Modeling, Design and Analysis of Large Strap-on Launch Vehicle's Attitude Control System[D]. National University of Defense Technology, 2011(in Chinese) [Google Scholar]
11. Liu Jinkun. Intelligent Control[M]. >Third Edition. Beijing: Publishing House of Electronics Industry, 2014 (in Chinese) [Google Scholar]