A Flexure-Based Mechanism for Precision Adjustment of National Ignition Facility Target Shrouds in Three Rotational Degrees of Freedom. (1st September 2016)

• Record Type: Journal Article
• Authors: Boehm, K.-J.; Gibson, C. R.; Hollaway, J. R.; Espinosa-Loza, F.
• Is Part Of: Fusion science and technology. Volume 70:Number 2(2016)
• Page Start: 265
• Page End: 273
• Publication Date: 2016-09-01
• Subjects: Fusion reactors -- Periodicals; Nuclear fusion -- Periodicals; Fusion reactors; Nuclear fusion; Periodicals; 621.48405
• DOI: 10.13182/FST15-217
• Languages: English
• ISSNs: 1536-1055

Abstract

Abstract: 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.