Large displacement behavior of double parallelogram flexure mechanisms with underconstraint eliminators
Abstract
This paper presents a new analytical method for predicting the large displacement behavior of flexural double parallelogram (DP) bearings with underconstraint eliminator (UE) linkages. This closed-form perturbative Euler analysis method is able to – for the first time – directly incorporate the elastomechanics of a discrete UE linkage, which is a hybrid flexure element that is linked to ground as well as both stages on the bearing. The models are used to understand a nested linkage UE design, however the method is extensible to other UE linkages. Design rules and figures-of-merit are extracted from the analysis models, which provide powerful tools for accelerating the design process. The models, rules and figures-of-merit enable the rapid design of a UE for a desired large displacement behavior, as well as providing a means for determining the limits of UE and DP structures. This will aid in the adoption of UE linkages into DP bearings for precision mechanisms. Models are generated for a nested linkage UE design, and the performance of this DP with UE structure is compared to a DP-only bearing. As a result, the perturbative Euler analysis is shown to match existing theories for DP-only bearings with distributed compliance within ≈2%, andmore »
- Authors:
-
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1313550
- Alternate Identifier(s):
- OSTI ID: 1397450
- Report Number(s):
- LLNL-JRNL-657740
Journal ID: ISSN 0141-6359
- Grant/Contract Number:
- AC52-07NA27344; 31006/12.1.1
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Precision Engineering
- Additional Journal Information:
- Journal Volume: 46; Journal Issue: C; Journal ID: ISSN 0141-6359
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING; underconstraint elimination; four-bar flexure; folded flexure; double parallelogram flexure; nested linkage; nonlinear beam analysis; elastokinematic effect; large displacement axial stiffness; large stroke; flexure mechanism
Citation Formats
Panas, Robert M. Large displacement behavior of double parallelogram flexure mechanisms with underconstraint eliminators. United States: N. p., 2016.
Web. doi:10.1016/j.precisioneng.2016.06.010.
Panas, Robert M. Large displacement behavior of double parallelogram flexure mechanisms with underconstraint eliminators. United States. https://doi.org/10.1016/j.precisioneng.2016.06.010
Panas, Robert M. Thu .
"Large displacement behavior of double parallelogram flexure mechanisms with underconstraint eliminators". United States. https://doi.org/10.1016/j.precisioneng.2016.06.010. https://www.osti.gov/servlets/purl/1313550.
@article{osti_1313550,
title = {Large displacement behavior of double parallelogram flexure mechanisms with underconstraint eliminators},
author = {Panas, Robert M.},
abstractNote = {This paper presents a new analytical method for predicting the large displacement behavior of flexural double parallelogram (DP) bearings with underconstraint eliminator (UE) linkages. This closed-form perturbative Euler analysis method is able to – for the first time – directly incorporate the elastomechanics of a discrete UE linkage, which is a hybrid flexure element that is linked to ground as well as both stages on the bearing. The models are used to understand a nested linkage UE design, however the method is extensible to other UE linkages. Design rules and figures-of-merit are extracted from the analysis models, which provide powerful tools for accelerating the design process. The models, rules and figures-of-merit enable the rapid design of a UE for a desired large displacement behavior, as well as providing a means for determining the limits of UE and DP structures. This will aid in the adoption of UE linkages into DP bearings for precision mechanisms. Models are generated for a nested linkage UE design, and the performance of this DP with UE structure is compared to a DP-only bearing. As a result, the perturbative Euler analysis is shown to match existing theories for DP-only bearings with distributed compliance within ≈2%, and Finite Element Analysis for the DP with UE bearings within an average 10%.},
doi = {10.1016/j.precisioneng.2016.06.010},
journal = {Precision Engineering},
number = C,
volume = 46,
place = {United States},
year = {Thu Jun 23 00:00:00 EDT 2016},
month = {Thu Jun 23 00:00:00 EDT 2016}
}
Web of Science
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