We first note that the mass-inertia matrix of the aerial
vehicle can be written as M = Mnom+ ˜M . Here, Mnom refers
to the nominal inertia matrix with nominal mass and inertia
parameters, and ( ˜M ) is the difference between actual and
nominal mass-inertia matrices.
Equation (20) can be rewritten in terms of the nominal
inertia matrix explicitly as