Actuator usage and fault tolerance of the James Webb Space Telescope optical element mirror actuators

A. Barto; D. S. Acton; P. Finley; B. Gallagher; B. Hardy; J. S. Knight; P. Lightsey

doi:10.1117/12.924596

21 September 2012 Actuator usage and fault tolerance of the James Webb Space Telescope optical element mirror actuators

A. Barto, D. S. Acton, P. Finley, B. Gallagher, B. Hardy, J. S. Knight, P. Lightsey

Proceedings Volume 8442, Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave; 84422I (2012) https://doi.org/10.1117/12.924596
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

The James Webb Space Telescope (JWST) telescope's secondary mirror and eighteen primary mirror segments are each actively controlled in rigid body position via six hexapod actuators. The mirrors are stowed to the mirror support structure to survive the launch environment and then must be deployed 12.5 mm to reach the nominally deployed position before the Wavefront Sensing and Control (WFSandC) alignment and phasing process begins. The actuation system is electrically, but not mechanically redundant. Therefore, with the large number of hexapod actuators, the fault tolerance of the OTE architecture and WFSandC alignment process has been carefully considered. The details of the fault tolerance will be discussed, including motor life budgeting, failure signatures, and motor life.

Citation Download Citation

A. Barto, D. S. Acton, P. Finley, B. Gallagher, B. Hardy, J. S. Knight, and P. Lightsey "Actuator usage and fault tolerance of the James Webb Space Telescope optical element mirror actuators", Proc. SPIE 8442, Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave, 84422I (21 September 2012); https://doi.org/10.1117/12.924596

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