Simulated Dynamic Interface Testing as a Tool in the Forecasting of Air Vehicle Deck Limits and Deck Landing Aids

摘要

The use of a 6 degree-of-freedom motion flight simulator to forecast physical deck motion and deck motion limits, is discussed. Full flight test programs using the Merlin CAE Trainer System at RNAS Culdrose and the Manned Flight Simulator at NAVAIRTESTCEN, (Patuxent River, Maryland), are described. Using a real-time ship motion-based helicopter recovery monitoring system (Landing Period Designator or LPD), pilots perform flight-testing evolutions (DLQ). The simulated flight test has five essential objectives: assess the capabilities of the Cockpit Dynamic Simulator (CDS) to support or conduct helicopter-ship operational limits; demonstrate High Level Architecture (HLA) federation; evaluate recovery safety improvements offered by experimental systems, such as the LPD; and determine feasibility of applying these simulators in support of dynamic interface at sea testing. The method, which has been implemented at both centres, gives good performance and correlation with apparent quiescent windows of deck motion. The theoretical approach is described. Results are presented in relation to the stability issues normally confronted by a helicopter at the instant of recovery in progressively difficult conditions. The summaries include development, simulation and testing of various helicopter recovery aids, which were applied during the simulator test. Measurements of instantaneous degree-of-freedom velocity and acceleration are reported, and preliminary comparisons are made with, and between, aided launch and recovery and non-aided evolutions. A brief synopsis of the theory and calculation of the ship motion simulation and Energy Index programs, are discussed. Air vehicle and deck availability are enhanced well beyond the indicated envelope when the operator uses the energy index to signal the top of recovery. As developed in the report, green deck points are identified even in the worst of sea conditions. The periods may be rapid, but owing to the rise time, the deck is constrained to pass from green to red by a latency period.