Manual Manipulation of Engine Throttles for Emergency Flight Control
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Cites background from "Manual Manipulation of Engine Throt..."
...This kind of failure has been reported as the main reason for several aircraft crashes such as Flight 85 (B-747, Alaska, 2002) [30] (where the lower rudder runaway led to full left deflection and caused the excessive roll of the aircraft)....
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...This type of failure led to flight incidents such as Flight 1080 (Lockheed L-1011, San Diego, 1977) [30], and flight 96 (DC-10, Ontario, 1972) [30]....
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Cites background from "Manual Manipulation of Engine Throt..."
...The output, y1, is initially below the limit and both Equations (1) and (2) are false....
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...Conditions 1 and 2 can be developed into equations analogous to Equations (1) and (2) with non-negative design parameters α2 and β2. min222 *)1( yy α+≤ (3) min2222 ** yTydt dy ≤∆β+ (4) It is worth noting that when Condition 1 is met (the variable is “close” to the limit) that the construction of Condition 2 can tB....
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...The switches shown on the output of each limit regulator only connect to the Max and Min selector blocks when both bounding conditions are true—Equations (5) and (6) for the Max limit regulator and Equations (7) and (8) for the Min limit regulator....
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...To determine the effectiveness of the conditionally active limit regulators on the engine response, three situations are evaluated: (1) a case where a transient limit regulator is necessary to ensure safe operation, (2) a case where a steadystate limit regulator is necessary to ensure safe operation, and (3) a case where a limit regulator becomes active unnecessarily during a transient....
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...The discrete version of the maximum limit inequalities Equations (5) and (6) is listed below where e[k] refers to the error at the current time index and e[k-1] to the error at the previous time step. max11 *][ yke α≤ (9) ( ) T kekeke T ∆β − ≤−− ∆ * ][]1[][1 1 1 11 (10) Also, the designer may find it desirable to use a filtered version of e[k] to reduce noise....
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References
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