Nowadays different aircraft systems such as air conditioning, avionics, flight controls and in-flight entertainment have to be supplied by different forms of power (mechanical, electrical, pneumatic, hydraulic). Multi-physical modeling and design methods allow for simulation and optimization of all diverse aircraft systems in one integrated model.
The energy systems are, in addition to the airframe and the power plants, a key element of any modern aircraft. They provide critical functions such as power supply, cabin pressurization and maneuverability on ground.