Simulation of an aircraft environmental control system

Abstract

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A Generalised Methodology for the Diagnosis of Aircraft Systems

“…The PACK conditions the pressure (P), temperature (T), and specific humidity (SH) of the bleed air to match the flight deck requirements. The conditioned air then passes through a mixed manifold system and air distribution system to the cabin, and the cabin pressure control system regulates the air pressure inside the cabin as required by the flight deck [26].…”

“…In order to simulate the operation of the ECS, a simulation package called SESAC (Simscape Environmental control system Simulation under All Conditions) is chosen [26]. SESAC provides a library of components to perform simulation of the ECS under a wide range of operating conditions for both healthy and faulty scenarios.…”

“…The SESAC component library has been configured to produce a detailed model of the B737-800 PACK. This model has been validated against actual data from the aircraft [26]. Fig 8 shows a schematic of the PACK model in SESAC.…”

“…The cooled air is then merged with the bypassed hot air, the TCV regulating the flow as demanded. Further details on the PACK model in SESAC can be found in this reference [26].…”

Aircraft system-level diagnosis with emphasis on maintenance decisions

“…The ECS is a system installed in all commercial aircraft with the purpose of providing conditioned air to the passenger cabin, by processing bleed air (from the engines or the APU) through a series of mechanical components. The principle of operation of a Boeing 737-800 ECS is presented in the work conducted by Jennions et al 16 in which a simulation model for the ECS is developed and its performance characteristics are explored for various boundary conditions.…”