MAE142_L20_TurnCoord.pdf - Turn Coordination Control Mixing...

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Turn Coordination Control Mixing Yaw Damper Limit Cycles MAE 142
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2 MAE 142 Aileron Input Ailerons require careful modeling because the control surface effectiveness depends upon both the size and location. x B y B z B increase lift increase drag decrease lift decrease drag +roll +yaw c l ∂ c l c l −∂ c l c d ∂ c d c d −∂ c d y a C l a = 2 y a b  S a S c l ∂ a C n a =− 2 y a b  S a S c d ∂ a y a = distance from centerline to aileron b = wingspan S a = aileron area (each side) S = wing reference area
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3 MAE 142 Aileron-Rudder Interconnect Implement aileron-to-rudder interconnect to reduce the yaw rate that is generated when ailerons are deflected. [ ˙ v ˙ r ] = [ Y v Y r V 0 N v N r ] [ v r ] [ Y a Y r N a N r ] [ a r ] a = ap r = rp K ap Airframe: Control: ap = pilot cmd aileron rp = pilot cmd rudder K = aileron-rudder gain [ ˙ v ˙ r ] = [ Y v Y r V 0 N v N r ] [ v r ] [ Y a K Y r Y r N a K N r N r ] [ a r ] Combine: Choose K such that: N a K N r = 0 K =− N a N r
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