Fault Investigation and Robust Failure Detection of Oscillating Aircraft Actuation Systems Using Analytical Redundancy

Beschreibung

This thesis investigates within the field of aeroservoelasticity the occurrence of faults in primary flight control systems, the detection of the related failures using methods of analytical redundancy and their impact on the structures of the airframe. Particular emphasis is placed on Oscillatory Failure Cases (OFCs), which occur as control surface oscillations. Such system failures must be accounted for in the development process of a flight control system and its integration in a new aircraft because these failures represent design cases for the structural loads of the airframe. Since the introduction of digital flight control systems and the fly-by-wire (FbW) technology the number of potential failure cases has increased due to a higher overall system complexity. Among such unprecedented failures are OFCs that are for example triggered by the electronic flight control system (EFCS), by oscillating air data sensors, or oscillating sensors of the inertial reference system. Their characteristic oscillatory signal signatures are unpredictable, thus belonging to the class of nondeterministic OFCs, while some other OFC causes, e.g., mechanical defects of the servo valve, lead to deterministic oscillations.

Autor*in

Helge Sachs

Themen in »Fault Investigation and Robust Failure Detection of Oscillating Aircraft Actuation Systems Using Analytical Redundancy«

Aircraft Systems Engineering Control Systems Engineering Fault Diagnosis and Detection Fehlerdiagnose und Fehlererkennung Flugzeug-Systemtechnik

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