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- W2074967433 abstract "Recently there has been a push for a vertical takeoff and landing rotorcraft that can approach 450 knots, with specific interest in a tip-jet reaction drive system to provide both the lift to the rotor and thrust for forward flight or yaw control. In this paper, the feasibility of using a distributed multivariable PI controller to control both the rotor and engines on the tip-jet reaction drive system is studied. To accurately develop control laws for the system, the dynamics present on the system need to be understood. For this study, a dynamic model of the tip-jet reaction drive system is built and the sensitivity of the dynamics to the dimensions of the system is analyzed. One specific transient of interest for the tip-jet reaction drive system is rotor load control. As the rotor load demand on the tip-jet reaction drive system changes, at a given constant rotor speed, the load on the rotor can be manipulated by changing either the mass flow or the velocity through the tip-jet exhaust nozzle. The velocity can be changed by adjusting the tip-jet fuel flow and exhaust nozzle area. Mass flow can primarily be adjusted by changing the operating points of the two engines supplying air to the tip-jet nozzles. The two rotor load control schemes that are analyzed are rotor load change with and without changing engine demand settings. Either scheme is shown to be feasible, offering different benefits depending on the metrics of most importance such as response time, fuel consumption, or noise." @default.
- W2074967433 created "2016-06-24" @default.
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- W2074967433 date "2009-08-02" @default.
- W2074967433 modified "2023-09-25" @default.
- W2074967433 title "Multivariable PI Control for Tip-Jet Reaction Drive Systems" @default.
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- W2074967433 doi "https://doi.org/10.2514/6.2009-4808" @default.
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