Mainly drawing on screw theory and linear algebra, this paper presents an approach to determining the bases of three unknown twist and wrench subspaces of lower mobility serial kinematic chains, an essential step for kinematic and dynamic modeling of both serial and parallel manipulators. By taking the reciprocal product of a wrench on a twist as a linear functional, the underlying relationships among their subspaces are reviewed by means of the dual space and dual basis. Given the basis of a twist subspace of permissions, the causes of nonuniqueness in the bases of the other three subspaces are discussed in some depth. Driven by needs from engineering design, criteria, and a procedure are proposed that enable pragmatic, consistent bases of these subspaces to be determined in a meaningful, visualizable, and effective manner. Three typical examples are given to illustrate the entire process. Then, formulas are presented for the bases of the twist/wrench subspaces of a number of commonly used serial kinematic chains, which can readily be employed for the formulation of the generalized Jacobian of a variety of lower mobility parallel manipulators.
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August 2015
Research-Article
An Approach to Determining the Unknown Twist/Wrench Subspaces of Lower Mobility Serial Kinematic Chains
Tian Huang,
Tian Huang
1
Professor
Key Laboratory of Mechanism Theory and
Equipment Design of Ministry of Education,
e-mail: tianhuang@tju.edu.cn;
tian.huang@warwick.ac.uk
Key Laboratory of Mechanism Theory and
Equipment Design of Ministry of Education,
Tianjin University
,Tianjin 300072
, China
e-mail: tianhuang@tju.edu.cn;
tian.huang@warwick.ac.uk
1Corresponding author.
Search for other works by this author on:
Shuofei Yang,
Shuofei Yang
Key Laboratory of Mechanism Theory and
Equipment Design of Ministry of Education,
e-mail: yangsf@tju.edu.cn
Equipment Design of Ministry of Education,
Tianjin University
,Tianjin 300072
, China
e-mail: yangsf@tju.edu.cn
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Manxin Wang,
Manxin Wang
Key Laboratory of Mechanism Theory and
Equipment Design of Ministry of Education,
e-mail: wangmxtju@aliyun.com
Equipment Design of Ministry of Education,
Tianjin University
,Tianjin 300072
, China
e-mail: wangmxtju@aliyun.com
Search for other works by this author on:
Tao Sun,
Tao Sun
Key Laboratory of Mechanism Theory and
Equipment Design of Ministry of Education,
e-mail: stao@tju.edu.cn
Equipment Design of Ministry of Education,
Tianjin University
,Tianjin 300072
, China
e-mail: stao@tju.edu.cn
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Derek G. Chetwynd
Derek G. Chetwynd
School of Engineering,
e-mail: D.G.Chetwynd@warwick.ac.uk
The University of Warwick
,Coventry CV4 7AL
, UK
e-mail: D.G.Chetwynd@warwick.ac.uk
Search for other works by this author on:
Tian Huang
Professor
Key Laboratory of Mechanism Theory and
Equipment Design of Ministry of Education,
e-mail: tianhuang@tju.edu.cn;
tian.huang@warwick.ac.uk
Key Laboratory of Mechanism Theory and
Equipment Design of Ministry of Education,
Tianjin University
,Tianjin 300072
, China
e-mail: tianhuang@tju.edu.cn;
tian.huang@warwick.ac.uk
Shuofei Yang
Key Laboratory of Mechanism Theory and
Equipment Design of Ministry of Education,
e-mail: yangsf@tju.edu.cn
Equipment Design of Ministry of Education,
Tianjin University
,Tianjin 300072
, China
e-mail: yangsf@tju.edu.cn
Manxin Wang
Key Laboratory of Mechanism Theory and
Equipment Design of Ministry of Education,
e-mail: wangmxtju@aliyun.com
Equipment Design of Ministry of Education,
Tianjin University
,Tianjin 300072
, China
e-mail: wangmxtju@aliyun.com
Tao Sun
Key Laboratory of Mechanism Theory and
Equipment Design of Ministry of Education,
e-mail: stao@tju.edu.cn
Equipment Design of Ministry of Education,
Tianjin University
,Tianjin 300072
, China
e-mail: stao@tju.edu.cn
Derek G. Chetwynd
School of Engineering,
e-mail: D.G.Chetwynd@warwick.ac.uk
The University of Warwick
,Coventry CV4 7AL
, UK
e-mail: D.G.Chetwynd@warwick.ac.uk
1Corresponding author.
Manuscript received March 5, 2013; final manuscript received August 27, 2014; published online December 4, 2014. Assoc. Editor: Xilun Ding.
J. Mechanisms Robotics. Aug 2015, 7(3): 031003 (9 pages)
Published Online: August 1, 2015
Article history
Received:
March 5, 2013
Revision Received:
August 27, 2014
Online:
December 4, 2014
Citation
Huang, T., Yang, S., Wang, M., Sun, T., and Chetwynd, D. G. (August 1, 2015). "An Approach to Determining the Unknown Twist/Wrench Subspaces of Lower Mobility Serial Kinematic Chains." ASME. J. Mechanisms Robotics. August 2015; 7(3): 031003. https://doi.org/10.1115/1.4028622
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