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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.    2021, Vol. 16 Issue (1) : 46-60    https://doi.org/10.1007/s11465-020-0606-2
RESEARCH ARTICLE
Dimensional synthesis of a novel 5-DOF reconfigurable hybrid perfusion manipulator for large-scale spherical honeycomb perfusion
Hui YANG1, Hairong FANG1(), Yuefa FANG1, Xiangyun LI2
1. School of Mechanical Engineering, Beijing Jiaotong University, Beijing 100044, China
2. School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China
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Abstract

A novel hybrid perfusion manipulator (HPM) with five degrees of freedom (DOFs) is introduced by combining the 5PUS-PRPU (P, R, U, and S represent prismatic, revolute, universal, and spherical joint, respectively) parallel mechanism with the 5PRR reconfigurable base to enhance the perfusion efficiency of the large-scale spherical honeycomb thermal protection layer. This study mainly presents the dimensional synthesis of the proposed HPM. First, the inverse kinematics, including the analytic expression of the rotation angles of the U joint in the PUS limb, is obtained, and mobility analysis is conducted based on screw theory. The Jacobian matrix of 5PUS-PRPU is also determined with screw theory and used for the establishment of the objective function. Second, a global and comprehensive objective function (GCOF) is proposed to represent the Jacobian matrix’s condition number. With the genetic algorithm, dimensional synthesis is conducted by minimizing GCOF subject to the given variable constraints. The values of the designed variables corresponding to different configurations of the reconfigurable base are then obtained. Lastly, the optimal structure parameters of the proposed 5-DOF HPM are determined. Results show that the HPM with the optimized parameters has an enlarged orientation workspace, and the maximum angle of the reconfigurable base is decreased, which is conducive to improving the overall stiffness of HPM.

Keywords 5-DOF hybrid manipulator      reconfigurable base      large workspace      dimensional synthesis      optimal design     
Corresponding Author(s): Hairong FANG   
Just Accepted Date: 18 December 2020   Online First Date: 18 January 2021    Issue Date: 11 March 2021
 Cite this article:   
Hui YANG,Hairong FANG,Yuefa FANG, et al. Dimensional synthesis of a novel 5-DOF reconfigurable hybrid perfusion manipulator for large-scale spherical honeycomb perfusion[J]. Front. Mech. Eng., 2021, 16(1): 46-60.
 URL:  
https://academic.hep.com.cn/fme/EN/10.1007/s11465-020-0606-2
https://academic.hep.com.cn/fme/EN/Y2021/V16/I1/46
Fig.1  Virtual prototype of the perfusion system. DC: Direct current.
Fig.2  Structure model and kinematic diagram of the hybrid perfusion mechanism: (a) Hybrid perfusion mechanism, (b) 5PRR reconfigurable base, (c) 5PUS-PRPU parallel mechanisms, and (d) kinematic diagram.
Fig.3  Diagram of the twist system for the PRPU limb.
Fig.4  Diagram of the ith PUS branch.
Fig.5  Screws of the ith PUS and the middle branch chains.
Fig.6  Pose of HPM in the task workspace.
Fig.7  Comparisons of condition numbers and orientation workspace with different λ1, λ 2, and λ3values: Condition number with (a) different λ1, (b) different λ2, and (c) different λ3; orientation workspace with (d) different λ 1, (e) different λ2, and (f) different λ 3.
Fig.8  (a) γi and (b) ηi with the change in α and β.
Fig.9  (a) κ and (b) κ ˜ with the change in λ1, λ 2, and λ4; (c) κ and (d) κ ˜ with the change in λ1, λ3, and λ4.
θ/(° ) λ1 λ2 λ3 λ4
20 [1.8, 2.2] [1.7, 2.1] [0.6, 1.0] [1.6, 1.9]
30 [1.8, 2.2] [1.7, 2.1] [0.6, 1.0] [1.9, 2.2]
40 [1.8, 2.2] [1.7, 2.1] [0.6, 1.0] [2.2, 2.5]
50 [1.8, 2.2] [1.7, 2.1] [0.6, 1.0] [2.5, 2.8]
60 [1.8, 2.2] [1.7, 2.1] [0.6, 1.0] [2.8, 3.1]
Tab.1  Variable ranges of λ 1, λ2, λ 3, and λ4 with different θ values
Fig.10  Optimization results of λ1, λ 2, λ3, and λ 4 based on GA when (a) θ=20°, (b) θ =30°, (c) θ= 40°, (d) θ=50°, and (e) θ =60°.
θ /(° ) λ 1 λ 2 λ 3 λ 4 ε min?
20 1.876 1.793 0.853 1.6 1.786
30 1.915 1.847 0.827 1.9 1.837
40 1.998 1.921 0.786 2.2 1.955
50 2.064 1.996 0.745 2.5 2.119
60 2.115 2.029 0.701 2.8 2.307
Tab.2  Optimal values of λ 1, λ2, λ 3, and λ4 with different θ values
θ/(° ) λ 1 λ 2 λ 3 λ 4 s imin? s imax? s 7min? s 7max? z min? zmax?/mm
20 2.115 2.029 0.701 1.6 47.81 1327.97 934.07 1196.41 1120 1330
30 2.115 2.029 0.701 1.9 84.39 1321.67 915.00 1178.19 1330 1540
40 2.115 2.029 0.701 2.2 131.16 1328.59 917.96 1181.01 1540 1750
50 2.115 2.029 0.701 2.5 200.09 1353.27 949.24 1210.92 1750 1960
60 2.115 2.029 0.701 2.8 301.11 1402.62 1014.26 1273.31 1960 2170
Tab.3  Values for the parameters of the proposed HPM
Fig.11  Comparison of the reachable workspace and task workspace of the proposed HPM: (a) 3D and (b) top views of the comparison of the position workspace; (c) 3D and (d) top views of the comparison of the orientation workspace.
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