Robust FDI for fault-tolerant thrust allocation with application to spacecraft rendezvous

Abstract

a b s t r a c tThis paper deals with the design and validation of an active fault-tolerant control system to detect, isolate and accommodate a single thruster fault affecting the thruster-based propulsion system of an autonomous spacecraft. The proposed method consists of a fault detector for robust and quick fault detection, a two-stage hierarchical isolation strategy for fault isolation, and an online control allocation unit scheduled by the isolation scheme for fault tolerance. A new factorization approach for the uncertain inertia matrix inverse is proposed. Thanks to this factorization, a novel robust Nonlinear Unknown Input Observers (NUIO) approach is proposed based on LMIs which ensure maximization of the admissible Lipschitz constant while at the same time satisfying an L 2 gain bound and some constraints on the observer dynamics. At the first stage of the isolation scheme, a bank of NUIOs is used to identify a subset of possible faulty thrusters. Then, at the second stage, an EKF is introduced to estimate the torque bias directions. Using these directions, jointly with the detector's residual and the information obtained from the first stage, a set of explicit rules is derived to unambiguously isolate the faulty thruster. A Monte Carlo campaign, based on a simulator developed by Thales Alenia Space industries, is conducted in the context of a terminal rendezvous phase of the Mars Sample Return mission. Mission oriented criteria demonstrate that the proposed strategy is able to cope with a large class of realistic thruster faults and to achieve mission success.

Model-based fault diagnosis and tolerant control: the ESA's e.Deorbit mission

“…Recent studies [4], [8] demonstrated that thrusters faults can be successfully diagnosed using the model that links the actuator (thruster) commands with the IMU measurement. This approach is retained in this work.…”

“…This paper overcomes this problem. The proposed strategy follows the study presented in [4], i.e. NL-UIO and control allocation techniques are used to diagnose and accommodate thruster faults.…”

Assessment of a Supervisory Fault-Hiding Scheme in a Classical Guidance, Navigation and Control Setup: the e.Deorbit mission

“…For instance, the work in [9] addresses the development of a CA-based FTC solution for flexible satellites. In [10,11], the classical SIMPLEX-based CA algorithm is changed by the Nonlinear Inverse Pseudo Control (NIPC) solution to improve the FTC performances of the terminal rendezvous phase of the Mars Sample Return mission. An alternative solution can also be found in [12,13] by acting at the guidance level.…”

Finite-time fault-tolerant control for flutter of wing

“…In general, FTC methods are classified into two types: passive fault tolerant control (PFTC) and active fault tolerant control (AFTC) schemes (Allerhand & Shaked, 2015;Cao, Chen, & Misra, 2014;Castaldi, Mimmo, & Simani, 2014;Fonod et al, 2015;Hu, Xiao, & Friswell, 2011;Jia, Chen, Zhang, & Li, 2015;Li & Yang, 2012;Liu, Qiu, Cui, & Sun, 2016;Marino, Scalzi, Tomei, & Verrelli, 2013;Mekki, Benzineb, Boukhetala, Tadjine & Benbouzid, 2015;Wang, Jing, Karimi, & Chen, 2015;Xiao, Hu, & Zhang, 2012). The similarities and differences between these two FTC design methodologies can be found in Jiang and Yu (2012).…”