Multipoint aerodynamic optimization can generally he described in the form of reference (353|:
I. Select objective function.
2. Select variables and constraints.
3. Select optimizers).
4. Optimize and analyze the results.
16.3.1 Drag as an Objective Function
X P, Y cDqSdx
Consider the objective function О described by the total energy loss due to aircraft drag during the operation of the aircraft over n missions:
In this expression./^ is the probability of mission i. and r is the block range for that mission. This expression can be simplified by weighing the drag over a number of representative design points:
о = X и’.со (107)
I В I
In our experience, five design points are enough to describe a multipoint design adequately.