Design and research of large aicrafts auxiliary power unit system inlet door position control

Large aircrafts auxiliary power unit system inlet door position control system is used for controlling auxiliary power unit inlet door opening and closing on the ground and in the air. The inlet door position control design is synchronal and interactional with inlet door design, inlet door aerodynamic load analysis and inlet duct design. This paper presents a design of large aircrafts auxiliary power unit system inlet door position control. This inlet door position control subsystem is characterized with an independent controller that is separated from APU digital electronic controller and a new inlet door actuation mechanism which has the function of output torque amplification. This design of inlet door position control is applied on a large aircraft model and demonstrated.