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Frontiers of Mechanical Engineering

ISSN 2095-0233

ISSN 2095-0241(Online)

CN 11-5984/TH

Postal Subscription Code 80-975

2018 Impact Factor: 0.989

Front Mech Eng    2012, Vol. 7 Issue (2) : 199-209    https://doi.org/10.1007/s11465-012-0315-6
RESEARCH ARTICLE
Modular design of typical rigid links in parallel kinematic machines: Classification and topology optimization
Xinjun LIU(), Xiang CHEN, Zhidong LI
The State Key Laboratory of Tribology & Institute of Manufacturing Engineering, Department of Precision Instruments and Mechanology, Tsinghua University, Beijing 100084, China
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Abstract

Due to the demand of reconfigurable system in parallel kinematic machines (PKMs), modular design technology is significant and necessary. However, in earlier research, the core joint modules have been concerned about rather than the customized link modules. The modular design to the typical customized links from the point of seeking optimal structures with best mechanical performances is analyzed and processed in two steps: classification and optimization. Firstly, a brief introduction to the current research status and the aims of this paper are outlined. And then, how the typical customized links classified is proposed. Next, the technology method and the iterative formula derivation process of topology optimization are described in detail. Finally, calculation models for each group of classified ones are set up and their optimal structures are achieved through topology optimization technique. The results provide useful references for reconfigurable and modular design in engineering cases.

Keywords parallel kinematic machines (PKMs)      modular design      classification      topology optimization and improved Guide-Weight method     
Corresponding Author(s): LIU Xinjun,Email:xinjunliu@mail.tsinghua.edu.cn   
Issue Date: 05 June 2012
 Cite this article:   
Xiang CHEN,Zhidong LI,Xinjun LIU. Modular design of typical rigid links in parallel kinematic machines: Classification and topology optimization[J]. Front Mech Eng, 2012, 7(2): 199-209.
 URL:  
https://academic.hep.com.cn/fme/EN/10.1007/s11465-012-0315-6
https://academic.hep.com.cn/fme/EN/Y2012/V7/I2/199
Fig.1  Current status of reconfigurable and modular research in PKMs
TypeRepresentative PKMs
(a)
HALF*PRR&2-PRRHexiglide
(b)
Delta3-RRRHexa
Tab.1  Two types of representative PKMs
Fig.2  Three force statuses of typical rigid links in PKMs
Fig.3  Calculation procedure of topology optimization
Fig.4  Factors that determine the optimal structures
Fig.5  Calculation model in topology optimization for the first group of rigid links
ParameterValueParameter meaning
E02.06×1011PaYoung’s module of the material
μ0.3Poisson’s radio of the material
ρ0[1,1,…,1]Initial value of the design variables
p4Penalty factor
f0.3Mass fraction
α0.5-0.8Step factor
?0.01Positive value of the convergent condition
N20Maximum iteration steps
Tab.2  Some necessary parameters for calculation of topology optimization
w=0.1
t = 0t = 0.8t = 2t = 4t = 6t = 8t=
l=1
l=2
l=3
l=4
Tab.3  Optimal structures of the first group while and varying
w
0.150.50.8
l=2
t=0
l=4
t=0
l=3
t=0.8
l=3
t=2
Tab.4  Optimal structures of the first group while varying
Fig.6  Definition of structural terms
Fig.7  Topology result of case 1 when =1, =4
Fig.8  Iteration process of case 1 in Fig. 7
Fig.9  Topology result of case 2 when
Fig.10  Iteration process of case 2 in Fig. 9
Fig.11  Calculation model in topology optimization for the second group of rigid links
W/LTt/Ms
014
0.1
0.5
1
Tab.5  Optimal structures of the second group
Fig.12  Calculation model in topology optimization for the third group of rigid links
W/LTt/Ms
014
0.1
0.5
1
Tab.6  Optimal structures of the third group
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