Design and precision performance research of exact constraint support structure

Exact constraint design can control the interrelation of the components by ensuring the number of the constraints being equal to the number of the degrees of freedom needed. The kinematic mounts which is a point contact linkup structure are the representative structure of exact constraint. It has μm orientation accuracy and 20nm relocation accuracy with low cost. According to the conception and design rule of the kinematic mounts the paper introduces its material choice, stability estimation and accuracy analysis. Two kinds of kinematic mounts sample (upside down and side hang) are designed that can be applied in the large aperture mirrors of ICF (Inertially Confined Fusion, ICF) facility. Mirror mounts of the samples are modularized LRU (Line Replace Unit, LRU). It can provide accurate allocated and relocated accuracy by adopting the kinematic design. Theoretical analysis, accuracy test of relocation and mechanic test of the samples are processed. The sample's maximal angle error of the two samples are less than 2" (design request less than ±40") and its relocating angle error less than 2.3"; (the upside down Sample) and 6.2" (the Side-hang Sample).