Pre-Phase A Report - Lisa - Nasa
Pre-Phase A Report - Lisa - Nasa
Pre-Phase A Report - Lisa - Nasa
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122 Chapter 5 Payload Design<br />
Ultra-Stable<br />
Oscillators<br />
Flex-pivot<br />
Beams<br />
Flex-pivots<br />
Optical Assembly<br />
Figure 5.3 Flex-pivot assembly, section view.<br />
Pointing Actuators and<br />
Return Mechanisms<br />
The return mechanisms are spring-loaded to keep the optical assemblies in contact with<br />
the pointing actuators.<br />
5.2.2 Payload thermal shield<br />
The payload thermal shield is an assembly of graphite-epoxy cylinders (two Y-tube arms,<br />
the Y-tube stub and the two baffles), reinforced by stiffening rings at various locations,<br />
as shown in Figure 5.4 .<br />
Y-tube<br />
Arms<br />
Spacecraft<br />
Solar Array /<br />
Sunshield<br />
Y-tube<br />
Stub<br />
Baffles<br />
Payload<br />
Radiator<br />
Plate<br />
Figure 5.4 Y-shaped payload thermal shield, viewed from above and below.<br />
Spacecraft<br />
Main Ring<br />
The “stub” of the payload thermal shield houses the ultra-stable oscillators, and is connected<br />
to the Spacecraft via three stressed fibreglass bands around its circumference.<br />
Blade-mounts attach each “arm” of the payload thermal shield to the spacecraft, at the<br />
point where the baffles meet the spacecraft ring. These blade-mounts allow longitudinal<br />
expansion of the Y-tube arms (due to thermal effects), whilst preventing motion in other<br />
directions.<br />
3-3-1999 9:33 Corrected version 2.08
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