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A Flexure-Based Mechanism for Precision Adjustment of National Ignition Facility Target Shrouds in Three Rotational Degrees of Freedom

K.-J. Boehm, C. R. Gibson, J. R. Hollaway, F. Espinosa-Loza

Fusion Science and Technology / Volume 70 / Number 2 / August-September 2016 / Pages 265-273

Technical Paper / dx.doi.org/10.13182/FST15-217

First Online Publication:June 24, 2016
Updated:August 9, 2016

This paper presents the design of a flexure-based mount allowing adjustment in three rotational degrees of freedom (DOFs) through high-precision set-screw actuators. The requirements of the application called for small but controlled angular adjustments for mounting a cantilevered beam. The proposed design is based on an array of parallel beams to provide sufficiently high stiffness in the translational directions while allowing angular adjustment through the actuators. A simplified physical model in combination with standard beam theory was applied to estimate the deflection profile and maximum stresses in the beams. A finite element model was built to calculate the stresses and beam profiles for scenarios in which the flexure is simultaneously actuated in more than one DOF.

 
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