Helicopter Rotor Model.pdf

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Helicopter Rotor Model
Copyright c 2020 Marek M. Cel. All rights reserved.
Author: Marek M. Cel
Revision: 1
Date: 2020-01-12
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Contents
Notation
1 Introduction
1.1 Coordinate Systems Used for Rotor Calculations
1.1.1 Rotor Axis System . . . . . . . . . . . .
1.1.2 Rotor-Wind Axis System . . . . . . . . .
1.1.3 Control Axis System . . . . . . . . . . .
1.1.4 Disc Axis System . . . . . . . . . . . . .
1.1.5 Control-Wind Axis System . . . . . . . .
1.1.6 Blade Axis System . . . . . . . . . . . .
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2 Actuator Disc Method
2.1 Assumptions . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Momentum Theory . . . . . . . . . . . . . . . . . . . .
2.2.1 Momentum Theory for Axial Flight . . . . . . .
2.2.2 Momentum Theory in Forward Flight . . . . . .
2.3 Forces Acting on the Blade Segment . . . . . . . . . .
2.4 Rotor Thrust . . . . . . . . . . . . . . . . . . . . . . .
2.5 Rotor Torque . . . . . . . . . . . . . . . . . . . . . . .
2.6 Flapping Coefficients . . . . . . . . . . . . . . . . . . .
2.6.1 Moments of Inertia Forces . . . . . . . . . . . .
2.6.2 Moment of Thrust . . . . . . . . . . . . . . . .
2.6.3 Equilibrium of Moments about Flapping Hinge
2.6.4 Final Form . . . . . . . . . . . . . . . . . . . .
3 Blade Element Method
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