Analysis and design of a large-range bistable linear guide with high support stiffness and low parasitic motion

Master thesis (2023)

Authors

T. Huijsmans Mechanical Engineering

Contributors

G. Radaelli Mechatronic Systems Design - Mechanical, Maritime and Materials Engineering (supervisor 1)
J.L. Herder Precision and Microsystems Engineering (supervisor 2)
R.A.J. van Ostayen Mechatronic Systems Design - Mechanical, Maritime and Materials Engineering (supervisor 2)
Faculty
Mechanical Engineering
Copyright: © 2023 Tom Huijsmans
Compliant Mechanism Mechanism Design Support Stiffness Linear guide Bistable mechanism Parasitic Motion
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Published Date

14-12-2023

Language

English

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Faculty

Mechanical Engineering

Abstract

The exploration of compliant mechanisms, especially those providing linear motion, has become a central focus in recent engineering research. These mechanisms, characterized by their monolithic bodies and reduced component interactions, present an attractive alternative to traditional rigid mechanisms, having reduced friction, decreased energy losses, and cost efficiencies. Despite these advantages, designing and analyzing compliant mechanisms remain difficult tasks, with particular challenges arising when aiming for large-range linear motion with high support stiffness and minimal parasitic displacement. This study presents a unique design: the combination of a flexure-based linear guide with the features of a bistable compliant switch mechanism. Because a combination of these mechanisms has not been looked into while still offering a long stroke, high support stiffness and minimal parasitic motion. Through Finite Element Analysis (FEA) and subsequent iterations, an optimized model was conceived, prioritizing stiffness and minimizing undesired motions. This optimized design was turned into a 3D printed prototype. The experiments with the prototype confirmed the results of our computational insights, showcasing the parasitic motion of the prototype to be within 1mm, and its minimum stiffness at least being 10kN/m while still having a stroke of 70mm. A case study has been set up, of which the proof of concept works and is validated.