Design and Stress Analysis of Extraterrestrial ... - The Black Vault

The mirror surface, in this case, is conical (Figure 2.57a),
a multilayer rigid design. On the main force ring 1, sol-dere•. 1;o
the ring base 2, a stainless steel profiled surface 3 is inv.-ta]leu.
To improve the reflecting capacity of the surface, a layer o.
aluminum 4 (layer thickness 0.05-0.01 mm) is applied to it and,
to strengthen this layer, another layer 5, which is similar in
composition to glass (Si0 2 ), with a thickness of less than 0.2 mm
is also applied.
On the nonoperating side of the surface 3 a honeycomb 6 of
thin aluminum (wall thickness less than 0.-a mm, view A) is soldered.
Packed in the cells is fibre glass 7, a strong light insulating
material. The entire structure is connected by soldering. In this
way, a mirror surface is achieved which ensures high insulation
efficiency.
Figure 2.67b shows the design of the joints for unfolding the
mirror. To a leaf of m..rror 1 is connected bracket 2 with a pivot
on the erid. Bracket 2 is attached to rigid frame 3 which has
swing axis 4. Support 5 with axis 4 is attached to the rigid force
ring 6 on the mirror, which with the mirror base 7 comprises the
main structural system of the solar concentrator.
2
(1
*3e
b).
I
•-3
a) b) ý r
Fig. 2.67. Mirror
construction.
KEY: (1) View.
2011