Blade Design, Manufacture, and Testing - Small Wind Turbines: Analysis, Design, and Application - page 123

The script creator generates the initial random population, and then refer-
ences survival to compute the fitness of each member. Then the main loop is
entered to repeat this process for the specified number of generations. It will be
shown below that the members of the final population converge in C P and T s ,
so it makes sense to take the average of the non-dominated blades as the output
of the optimisation. This averaging also reduces any random fluctuations in
chord and twist. Note that the Matlab line continuation mark (…) has been
removed from the two lines for the best_blade_fitness in the interests of
brevity.
The script creator.m is listed below. The chord and twist of the initial
population are chosen randomly but within the limits specified. The chord and
twist are equal for all blade elements of each member. The arrays to hold the
blade fitness, whether the blade is dominated, and its age are set up for later
use.

Table 7.1 Input parameters
for blade design for the
Ginlong PMG 500 A
permanent magnet generator

Parameter and value Parameter and value

q b = 550 kgm -3 N = 3

U s = 5 m/s U p = 10 m/s

k f = 1.0 k p = 6.10

R = 1.06 m r h = 0.125

Maximum c/R = 0.2 Minimum c/R = 0.01

Maximum h p = 25 Minimum h p =-5

Maximum power = 754 W
Generator inertia
= 0.006 kgm 2

Cogging torque = 0
and 0.5 Nm
Aerofoil section SG 6043