A geometric constraint library for 3D graphical applications

2002 ◽  
Author(s):  
Hiroshi Hosobe
Keyword(s):  
Geometric Constraint

scholarly journals Constraint and Mobility Change Analysis of Rubik’s Cube-inspired Reconfigurable Joints and Corresponding Parallel Mechanisms

2020 ◽  
Vol 33 (1) ◽  
Author(s):  
Duanling Li ◽  
Pu Jia ◽  
Jiazhou Li ◽  
Dan Zhang ◽  
Xianwen Kong
Keyword(s):  
Parallel Mechanism ◽  
Unique Feature ◽  
Theoretical Method ◽  
Geometric Constraint ◽  
Parallel Mechanisms ◽  
Change Analysis ◽  
Application Range ◽  
And Topology ◽  
Physical Experiments ◽  
Underlying Principle

Abstract The current research of reconfigurable parallel mechanism mainly focuses on the construction of reconfigurable joints. Compared with the method of changing the mobility by physical locking joints, the geometric constraint has good controllability, and the constructed parallel mechanism has more configurations and wider application range. This paper presents a reconfigurable axis (rA) joint inspired and evolved from Rubik's Cubes, which have a unique feature of geometric and physical constraint of axes of joint. The effectiveness of the rA joint in the construction of the limb is analyzed, resulting in a change in mobility and topology of the parallel mechanism. The rA joint makes the angle among the three axes inside the groove changed arbitrarily. This change in mobility is completed by the case illustrated by a 3(rA)P(rA) reconfigurable parallel mechanism having variable mobility from 1 to 6 and having various special configurations including pure translations, pure rotations. The underlying principle of the metamorphosis of this rA joint is shown by investigating the dependence of the corresponding screw system comprising of line vectors, leading to evolution of the rA joint from two types of spherical joints to three types of variable Hooke joints and one revolute joint. The reconfigurable parallel mechanism alters its topology by rotating or locking the axis of rA joint to turn all limbs into different phases. The prototype of reconfigurable parallel mechanism is manufactured and all configurations are enumerated to verify the validity of the theoretical method by physical experiments.

Generator of 2D Geometric Constraint Graphs

2015 ◽  
Vol 13 (3) ◽  
pp. 271-280 ◽  
Author(s):  
Adel Moussaoui ◽  
Samy Ait-Aoudia
Keyword(s):  
Geometric Constraint

YOLO-SLAM: A semantic SLAM system towards dynamic environment with geometric constraint

2022 ◽  
Author(s):  
Wenxin Wu ◽  
Liang Guo ◽  
Hongli Gao ◽  
Zhichao You ◽  
Yuekai Liu ◽  
...  
Keyword(s):  
Dynamic Environment ◽  
Geometric Constraint

scholarly journals Re-parameterization reduces irreducible geometric constraint systems

2016 ◽  
Vol 70 ◽  
pp. 182-192 ◽  
Author(s):  
Hichem Barki ◽  
Lincong Fang ◽  
Dominique Michelucci ◽  
Sebti Foufou
Keyword(s):  
Geometric Constraint ◽  
Constraint Systems
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