The document summarizes the modelled weight of a structure at each optimization iteration for three different curves - blue, red, and green. The blue curve has the lowest initial weight since heavier members were not assigned to support points. The red curve slows to a 2 metric ton weight change after the 5th iteration and stops changing after the 10th. The green curve corrects some under-designed members between the first and second stage of refinement.

1. ZP3 Modelled Weight
at each Optimization
Iteration
NOTES
1. Modelled structure weight at Iteration “OO” is less in the blue curve since no heavier members in way of module support points are assigned.
Modelled structure weight at Iteration “OO” for the red and green curves is the same.
2. In the red curve the rate of weight change per iteration reduces to about 2 MT after the 5th iteration (8E) and down to zero after the 10th
iteration (8J).
3. In the green curve, the section properties of a few under-designed members were corrected as part of the Stage Two refinement. Ideally this
would normally be performed at Iteration “OO”.
4500
4700
4900
5100
5300
5500
5700
5900
6100
6300
OO 8A 8B 8C 8D 8E 8F 8G 8H 8I 8J 8K 8L 8M 8N 8O 8P 8Q
ZP3 Modelled Structure Weight (kN) at each
Iteration
BEFORE Refinement AFTER Stage 1 Refinement AFTER Stage 2 Refinement