According to the special need of turbo-shaft engines for fast response in helicopter autorotaion training process

a robust control scheme for turbo-shaft engines

including both fuel mass flow and guided vanes angle control

was proposed and designed to reduce the turbine speed transient droop. Firstly

an improved comprehensive model of UH-60 helicopter/T700 engines

which can simulate autorotation decent and autorotation recovery

was presented. Secondly

robust control scheme for turbo-shaft engine based on fuel mass flow and guided vanes adjustment was preset in the simulation cases. The result shows clearly that the turbine speed transient droop

controlled by the proposed robust control scheme

is sharply reduced to 3% than traditional method only exploring fuel mass flow control

while the variation of fuel mass flow is much slower and the operation condition of the actuator is improved.