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

This study 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.
Authors:
 [1] ;  [1] ;  [2] ;  [2]
  1. General Atomics, San Diego, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-674354
Journal ID: ISSN 1536-1055; TRN: US1701671
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Fusion Science and Technology
Additional Journal Information:
Journal Volume: 70; Journal Issue: 2; Journal ID: ISSN 1536-1055
Publisher:
American Nuclear Society
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 3 DOF; flexure; precision alignment
OSTI Identifier:
1343009

Boehm, K. -J., Gibson, C. R., Hollaway, J. R., and Espinoza-Loza, F.. A Flexure-Based Mechanism for Precision Adjustment of National Ignition Facility Target Shrouds in Three Rotational Degrees of Freedom. United States: N. p., Web. doi:10.13182/FST15-217.
Boehm, K. -J., Gibson, C. R., Hollaway, J. R., & Espinoza-Loza, F.. A Flexure-Based Mechanism for Precision Adjustment of National Ignition Facility Target Shrouds in Three Rotational Degrees of Freedom. United States. doi:10.13182/FST15-217.
Boehm, K. -J., Gibson, C. R., Hollaway, J. R., and Espinoza-Loza, F.. 2016. "A Flexure-Based Mechanism for Precision Adjustment of National Ignition Facility Target Shrouds in Three Rotational Degrees of Freedom". United States. doi:10.13182/FST15-217. https://www.osti.gov/servlets/purl/1343009.
@article{osti_1343009,
title = {A Flexure-Based Mechanism for Precision Adjustment of National Ignition Facility Target Shrouds in Three Rotational Degrees of Freedom},
author = {Boehm, K. -J. and Gibson, C. R. and Hollaway, J. R. and Espinoza-Loza, F.},
abstractNote = {This study 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.},
doi = {10.13182/FST15-217},
journal = {Fusion Science and Technology},
number = 2,
volume = 70,
place = {United States},
year = {2016},
month = {9}
}