A FTC Strategy for Safe Recovery against Trimmable Horizontal Stabilizer Failure with Guaranteed Nominal Performance

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A FTC Strategy for Safe Recovery against Trimmable Horizontal Stabilizer Failure with Guaranteed Nominal Performance

Cieslak, Jérome / Henry, David / Zolghadri, Ali

Introduction The need for increased flight safety and aircraft reliability leads to the design of reconfigurable fault tolerant control systems. Such systems are meant to manage faulty situations and help the crew to recover control capabilities quickly. Fault Tolerant Control (FTC) is one solution to tackle this problem and has received considerable attention from the control research community and aeronautical engineering researchers in the past couple of decades (for a survey, see for instance [1, 2, 3]). The main objective of fault tolerant control is to maintain a specified performance level in the presence of faults. Two approaches can be distinguished in this area: passive and active. In the passive approach, the control algorithm is designed so that the system is able to achieve its given objectives, in healthy as well as faulty situations. Unfortunately, achieving robustness to certain faults is only possible at the expense of decreased nominal performance. Active approaches react to fault events by using a reconfiguration mechanism and, in certain cases, this ensures nominal performance in fault free situations. This is a great benefit of active FTC approaches.