Template:Aircraft Phases with Forced Landing

Aircraft Phases with Forced Landing
Consider to simulate a flight journey for a four-engine aircraft. The configuration of the aircraft changes at different time. During taxing phase, the navigation system and only 1-out-of-4 engines and all three landing gears are need. During take-off phase, four engines, navigation system and three landing gears are need. During cursing phase, navigation system and 3-out-of-4 engines are required. During landing phase,navigation system, 2-out-of-4 engines and three landing gears are required. After finishing a journey with these four phases, the aircraft would goes into a maintenance phase for maintenance. However, Except these four phases, there is a special phase named forced landing phase. This phase is used for modeling the case when there is a failure occurred during take-off, cruising or landing phase, the aircraft would be forced to land. If the forced landing successes, the aircraft would goes into maintenance phase for maintenance. However, if the forced landing fails, the aircraft crashed and the simulation ends.

Purposes
The purposes of this example is to illustrate how to create a nonlinear system with F/S links in phase simulation.

RBDs for Phase and settings
The RBDs for Taxing phase and Take-Off phase are as followings:

The RBDs for other three phases are as followings:

The Phase diagram is as followings:

The reliability of navigation system follows Weibull distribution with Beta=1.5 and Eta=30 hours. The reliability of engines follows Weibull distribution with Beta =1.5 and Eta=20 hours. The reliability of landing gears follow Weibull distribution with Beta=1.5 and Eta=15 hours.

In maintenance phase, all blocks has CM with duration=3 hours. And the CM is performed upon item failure. All blocks also are subjected to PM with duration =0.5 hours and the PM is performed when the maintenance phase starts. Both CM and PM restore the blocks to as good as new.