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research article

Higher-order continuation method for the rigid-body kinematic design of compliant mechanisms

Rubbert, Lennart  
•
Charpentier, Isabelle
•
Henein, Simon  
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2017
Precision Engineering-Journal Of The International Societies For Precision Engineering And Nanotechnology

Compliant mechanisms are of great interest in precision engineering. In this paper we propose a higher order continuation method to help their rigid-body kinematic design. The method helps to investigate the choice of a mechanism configuration through the whole exploration of the workspace, and eases the kinematic analysis to avoid, or take advantage of, the vicinity of kinematic singularities. Such approach is relevant for planar and quasi-planar mechanisms that can be obtained with micro-manufacturing processes adapted to precision applications. The higher-order continuation method allows for a direct and accurate plotting of the input-output relationship of any mechanism by considering only its geometrical closed-loop equations, i.e. without the complex derivation of any analytical model. We show that these plots, called bifurcation diagrams, reveal essential information such as the joint velocity profile and the presence of singular configurations. Moreover, the continuous and accurate computation of the mechanism configuration in the vicinity of singularities provides detailed information about the kinematic behavior of the mechanism in its extreme positions. For the design of compliant mechanisms, the designer can advantageously use the bifurcation diagrams to evaluate the relevance of the selected mechanism, then to identify a configuration in order to obtain desired kinematic properties without the derivation of the inverse kinematic model (IKM). or the direct kinematic model (DKM). The method is exemplified with a 3 universal-joint and 3 spherical-joint mechanism (3-US), the IKM and DKM of which cannot be derived analytically. The latter has a large workspace and special kinematic behaviors consisting of a screw-like motion and a platform gyration, which have not been studied before and could lead to novel compliant devices. (C) 2017 Elsevier Inc. All rights reserved.

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Type
research article
DOI
10.1016/j.precisioneng.2017.06.021
Web of Science ID

WOS:000409151100049

Author(s)
Rubbert, Lennart  
Charpentier, Isabelle
Henein, Simon  
Renaud, Pierre
Date Issued

2017

Published in
Precision Engineering-Journal Of The International Societies For Precision Engineering And Nanotechnology
Volume

50

Start page

455

End page

466

Subjects

Compliant mechanism

•

Mechanical design

•

Higher-order continuation method

•

Bifurcation diagram

•

3-US mechanism

•

Singularity

•

Workspace analysis

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
INSTANT-LAB  
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/141158
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