Chapter 5 Robust Performance Tailoring with Tuning - SSL - MIT

6.2 Design Parameters
In order to apply the tailoring and tuning design optimizations to the TPF SCI
model to improve the RMS OPD, the control, or tailoring and tuning, and noise,
or uncertainty, parameters must first be identified. In the following sections these
parameters are presented along with appropriate design variable constraints.
6.2.1 Tailoring
Similar to the development model the tailoring parameters allow variation of the
truss geometry. However, since the TPF SCI model is a high-fidelity truss structure
there are more design options available and a practical and easily visualized tailoring
approach is possible. Instead of varying the cross-sectional diameters of each truss
segment, the overall geometry of the truss is tailored. To this end, four tailoring
parameters are selected as listed in Table 6.10.
Table 6.10: TPF SCI model tailoring parameters.
x Description x0 Units
h1 outer bay height 1 m
h2 center bay height 1 m
w1 outer bay width 2 m
w2 center bay width 2 m
The values h1 and h2 are the height of the batten frames (Figure 6-5(c)) at the
end and in the center of the truss, respectively as shown in Figure 6-9. In the nominal
configuration these values are set equal to each other so that the batten frames are
the same height from bay to bay (Figure 6-2(d)), but for the tailoring optimization
they are allowed to change independently so that a configuration such as that shown
in Figure 6-9(a) could result. The height of the bays between the end bay and the
center bay vary linearly in the x-direction, and the top surface of the truss is always
at Z=0 so that the positions of the collectors remain collinear. In order to reduce
the number of tailoring parameters and limit the computational effort the truss is
assumed to be symmetric about the center so that the batten height at either end is
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