Simulink Control Design™ - MathWorks

states are the roll angle phi, the body velocities ub,vb,wb, and the angular rates p,q,r.

Accordingly, use modred to obtain a 7th-order model that only retains these states.

G7 = G;

xKeep = {...

'phi theta psi(1)'

'ub,vb,wb(1)'

'ub,vb,wb(2)'

'ub,vb,wb(3)'

'p,q,r(1)'

'p,q,r(2)'

'p,q,r(3)'};

[~,xElim] = setdiff(xG,xKeep);

for ct=1:40

G7(:,:,ct) = modred(G(:,:,ct),xElim,'truncate');

end

With these linearized models in hand, you can move to the task of tuning and scheduling

the flight control system gains. See “Angular Rate Control in the HL-20 Autopilot”

(Control System Toolbox) for Part 2 of this example.

See Also

More About

• “Angular Rate Control in the HL-20 Autopilot” (Control System Toolbox)


• “Model Gain-Scheduled Control Systems in Simulink” (Control System Toolbox)

11 Gain-Scheduled Controllers