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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.    2016, Vol. 11 Issue (2) : 135-143    https://doi.org/10.1007/s11465-016-0389-7
RESEARCH ARTICLE
Analysis of the kinematic characteristics of a high-speed parallel robot with Schönflies motion: Mobility, kinematics, and singularity
Fugui XIE(),Xin-Jun LIU()
The State Key Laboratory of Tribology & Institute of Manufacturing Engineering, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China; Beijing Key Laboratory of Precision/Ultra-precision Manufacturing Equipment and Control, Tsinghua University, Beijing 100084, China
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Abstract

This study introduces a high-speed parallel robot with Schönflies motion. This robot exhibits a promising prospect in realizing high-speed pick-and-place manipulation for packaging production lines. The robot has four identical limbs and a single platform. Its compact structure and single-platform concept provides this robot with good dynamic response potential. A line graph method based on Grassmann line geometry is used to investigate the mobility characteristics of the proposed robot. A generalized Blanding rule is also introduced into this procedure to realize mutual conversion between the line graphs for motions and constraints. Subsequently, the inverse kinematics is derived, and the singularity issue of the robot is investigated using both qualitative and quantitative approaches. Input and output transmission singularity indices are defined based on the reciprocal product in screw theory and the virtual coefficient by considering motion/force transmission performance. Thereafter, the singular loci of the proposed robot with specific geometric parameters are derived. The mobility analysis, inverse kinematics modeling, and singularity analysis conducted in this study are helpful in developing the robot.

Keywords parallel robot      mobility      inverse kinematics      singularity      transmission performance     
Corresponding Author(s): Fugui XIE,Xin-Jun LIU   
Online First Date: 25 May 2016    Issue Date: 29 June 2016
 Cite this article:   
Fugui XIE,Xin-Jun LIU. Analysis of the kinematic characteristics of a high-speed parallel robot with Schönflies motion: Mobility, kinematics, and singularity[J]. Front. Mech. Eng., 2016, 11(2): 135-143.
 URL:  
https://academic.hep.com.cn/fme/EN/10.1007/s11465-016-0389-7
https://academic.hep.com.cn/fme/EN/Y2016/V11/I2/135
Fig.1  CAD model of the spatial parallel robot: (a) Overview and (b) bottom view
Fig.2  Kinematic scheme of the parallel robot presented in Fig. 1
Graphic expression Physical meaning
Rotational motion
Constraint force
Translational motion
Constraint couple
Tab.1  Basic elements and their meanings
Fig.3  Relationship among line vectors
Fig.4  Relationship between line vector and couple
Fig.5  Relationship among couples
Fig.6  Motion line graph in the third chain and the corresponding constraint line graph
Fig.7  Constraint line graph of the mobile platform
Fig.8  Motion line graph of the mobile platform
Fig.9  Input transmission singularity: (a) RR(Pa)RR kinematic chain and (b) PRR kinematic chain
Fig.10  Sample case for output transmission singularity
Fig.11  Distribution of the output transmission singularity indices
Fig.12  Singular loci in the plane z = −1.8 and z = −2.4 when φ ( 45 ° , 45 ° )
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