Keywords
- enlarged workspace
- finite element theory
- flexible beams
- nano-positioning stage
- redundant actuation
ASJC Scopus subject areas
- Signal Processing
- Civil and Structural Engineering
- Atomic and Molecular Physics, and Optics
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Electrical and Electronic Engineering
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}
TY - JOUR
T1 - Redundantly piezo-actuated XYθzcompliant mechanism for nano-positioning featuring simple kinematics, bi-directional motion and enlarged workspace
AU - Zhu, Wu Le
AU - Zhu, Zhiwei
AU - To, Suet
AU - Liu, Qiang
AU - Ju, Bing Feng
AU - Zhou, Xiaoqin
PY - 2016/11/10
Y1 - 2016/11/10
N2 - � 2016 IOP Publishing Ltd. This paper presents a novel redundantly piezo-actuated three-degree-of-freedom XYθzcompliant mechanism for nano-positioning, driven by four mirror-symmetrically configured piezoelectric actuators (PEAs). By means of differential motion principle, linearized kinematics and physically bi-directional motions in all the three directions are achieved. Meanwhile, the decoupled delivering of three-directional independent motions at the output end is accessible, and the essential parallel and mirror symmetric configuration guarantees large output stiffness, high natural frequencies, high accuracy as well as high structural compactness of the mechanism. Accurate kinematics analysis with consideration of input coupling indicates that the proposed redundantly actuated compliant mechanism can generate three-dimensional (3D) symmetric polyhedral workspace envelope with enlarged reachable workspace, as compared with the most common parallel XYθzmechanism driven by three PEAs. Keeping a high consistence with both analytical and numerical models, the experimental results show the working ranges of �6.21 μm and �12.41 μm in X- and Y-directions, and that of �873.2 μrad in θz-direction with nano-positioning capability can be realized. The superior performances and easily achievable structure well facilitate practical applications of the proposed XYθzcompliant mechanism in nano-positioning systems.
AB - � 2016 IOP Publishing Ltd. This paper presents a novel redundantly piezo-actuated three-degree-of-freedom XYθzcompliant mechanism for nano-positioning, driven by four mirror-symmetrically configured piezoelectric actuators (PEAs). By means of differential motion principle, linearized kinematics and physically bi-directional motions in all the three directions are achieved. Meanwhile, the decoupled delivering of three-directional independent motions at the output end is accessible, and the essential parallel and mirror symmetric configuration guarantees large output stiffness, high natural frequencies, high accuracy as well as high structural compactness of the mechanism. Accurate kinematics analysis with consideration of input coupling indicates that the proposed redundantly actuated compliant mechanism can generate three-dimensional (3D) symmetric polyhedral workspace envelope with enlarged reachable workspace, as compared with the most common parallel XYθzmechanism driven by three PEAs. Keeping a high consistence with both analytical and numerical models, the experimental results show the working ranges of �6.21 μm and �12.41 μm in X- and Y-directions, and that of �873.2 μrad in θz-direction with nano-positioning capability can be realized. The superior performances and easily achievable structure well facilitate practical applications of the proposed XYθzcompliant mechanism in nano-positioning systems.
KW - enlarged workspace
KW - finite element theory
KW - flexible beams
KW - nano-positioning stage
KW - redundant actuation
UR - http://www.scopus.com/inward/record.url?scp=84995376251&partnerID=8YFLogxK
U2 - 10.1088/0964-1726/25/12/125002
DO - 10.1088/0964-1726/25/12/125002
M3 - Journal article
VL - 25
JO - Smart Materials and Structures
JF - Smart Materials and Structures
SN - 0964-1726
IS - 12
M1 - 125002
ER -