Chapter 4 Forces and Moments Beard Mc Lain
Chapter 4 Forces and Moments Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 1
Equations of Motion from Chap 3 Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 2
External Forces and Moments Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 3
Gravity Force Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 4
Airfoil Pressure Distribution ure s s re p c w lo be ti a t s above static pressure Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 5
Aerodynamic Approximation Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 6
Control Surfaces - Conventional Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 7
Control Surfaces – V-tail Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 8
Control Surfaces – Flying Wing Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 9
Aircraft Dynamics • Aircraft dynamics and aerodynamics are commonly separated into two groups: • Longitudinal • Up-down, pitch plane, pitching motions • Lateral-directional • Side-to-side, turning motions (roll and yaw) Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 10
Longitudinal Aerodynamics Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 11
Aerodynamic Approximation stability derivatives control derivative Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 12
Linear Aerodynamic Model Linear aerodynamic model is valid for small angles of attack – flow remains attached over wing Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 13
Nonlinear Aerodynamics – Stall Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 14
Nonlinear Lift Model Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 15
Nonlinear Aerodynamic Model linear model flat-plate model blending function Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 16
Nonlinear Aerodynamic Model Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 17
Drag vs. Angle of Attack parasitic drag induced drag parasitic drag: profile drag of wing, friction and pressure drag of tail surfaces, fuselage, landing gear, etc. induced drag: “drag due to lift” linear model incorrect for negative angles of attack Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 18
Linear Lift and Drag Models Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 19
Longitudinal Forces – Body Frame Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 20
Pitching Moment Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 21
Lateral Aerodynamics Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 22
Lateral Aerodynamics Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 23
Aerodynamic Coefficients Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 24
Aerodynamic Coefficients Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 25
Propeller Thrust Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 26
Propeller Torque Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 27
Wind Model Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 28
Dryden Gust Model Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 29
Wind Model Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 30
Adding in the Effects of Wind Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 31
Summary Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 32
Project 4 Beard & Mc. Lain, “Small Unmanned Aircraft, ” Princeton University Press, 2012, Chapter 4: Slide 33
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