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Part 2-2. Aircraft Fuel System Simulation in FloMASTER - Adding Active Control

INTRODUCTION

The fuel systems on modern multi-engine aircraft must function flawlessly for many different operational scenarios, and must be designed to conform to very strict functional specifications as required by the FAA. These requirements, as related to this series of papers, were discussed in the first paper of this series. That first paper, presented the modeling of a typical aerospace fuel system model and performed a few basic but important initial flow studies. These studies solved real world issues, such as identifying an optimum pipe size for the refueling line, and selecting flow restrictors to balance flow. The studies were able to determine the system pressure required to reach the desired design flow rate. Finally, it examined a transient analysis scenario to understand the effect of valve closure timing on pressure wave propagation.

This paper will go one step further and introduce active control through the use of PID and programmable logical controllers to better manage both the refueling of the aircraft and also the fuel transfer from tank to tank during flight, to optimize the aircraft balance and performance while minimizing weight.