Loss-of-Control Prediction and Prevention for NASA's Transport Class Model

Online Safe Flight Envelope Prediction for Damaged Aircraft: A Database-driven Approach

“…[3][4][5] Furthermore, some researchers are trying to quantify LOC events from flight data by defining metrics consist of five envelopes that are related to airplane flight dynamics, aerodynamics, structural integrity and flight control use. 6,7 Their results can help investigators decide whether or not the accident should be classified as a LOC, and identify the axis in which each event started as well as the chain of events that led to the lost controls, which will suggest valuable clues on how best to prevent future LOC events. However, this quantitative approach still reveals some limitations, so we still need more insights on how damages and faults have impact on the performance of aircraft.…”

“…As an important branch and one of the most promising techniques of LOC prevention project, several safe flight envelope protection systems 6 have been designed and proposed. The task of envelope protection can be generally divided into two steps: one is the determination of safe flight envelopes; and the other is to guarantee that the aircraft states stay within the safe flight envelope.…”

“…The task of envelope protection can be generally divided into two steps: one is the determination of safe flight envelopes; and the other is to guarantee that the aircraft states stay within the safe flight envelope. 10 As to the second step, there exist literatures 6,10,11 covering how to help keep aircraft flying within pre-defined state boundaries and detect potential hazards through constant health monitoring, during which warnings will be given if certain boundaries 7 are violated due to some aggressive manoeuvres like abrupt pitch down and up of high angles. The research of this paper, on the other hand, focuses on the first step, which is the prerequisite of flight envelope protection system.…”

Online Physical Model Identification for Database-driven Safe Fight Envelope Prediction of Damaged Aircraft

“…This quantitative approach is designed to reduce the occurrence of abnormal conditions, and is further studied by Chongvisal 4 and applied to the development of in-flight loss-of-control prediction and prevention systems to assist the pilot in flying the aircraft through adverse environmental conditions. 4 Whereas this quantitative approach may not be applicable to the post-damage case when the nominal model is no longer valid, and the new safe operation boundaries need to be redefined. The determination of safe flight envelope under off-nominal conditions in some works in this area is derived from the calculation of backward and forward reachable sets, which is connected to optimal control theory and level set method based on the continuous-time nonlinear models.…”

Aircraft Damage Identification and Classification for Database-driven Online Safe Flight Envelope Prediction

“…Different definitions of the flight envelope are proposed in the literature; see, e.g., [4][5][6][7][8][9]. Widely used to prevent stall and potential structural damage, the conventional maneuvering envelope defines hard constraints on the speed and load factor.…”