Method for Generating a Randomized Flight-by-Flight Loading Sequence for an Aircraft

摘要

This report provides a technique for obtaining a flight-by-flight loading sequence that could be used in fracture and fatigue analyses and in durability and damage tolerance testing of an aircraft. The major load producing events (i.e. take-off taxi, flight, touch and go landings, landing, and landing taxi) are considered sequentially. The missions in which these events occur can be drawn randomly or put in a predetermined order. The loadings within each event are obtained randomly. The flight loads (include both maneuver loads and gusts) are assumed to be derived from flight recorder data or from a specific mission profile. In both cases the flight portion is divided into intervals to account for separate phases of the mission and weight changes during flight. In addition an aircraft temperature profile associated with the mission is randomly sampled to provide a flight-by-flight temperature sequence. To provide more flexibility in deriving the flight-by-flight sequence the mission time can be obtained by a random sampling. The computer program for generating in flight-by-flight sequence is included along with a sample problem. (Author)