Calibration of a parallel mechanism in a serial-parallel polishing machine tool based on genetic algorithm

2015 ◽  
Vol 81 (1-4) ◽  
pp. 27-37 ◽  
Author(s):  
Cheng Fan ◽  
Guoliang Zhao ◽  
Ji Zhao ◽  
Lei Zhang ◽  
Lining Sun
Keyword(s):  
Genetic Algorithm ◽  
Machine Tool ◽  
Parallel Mechanism ◽  
Polishing Machine

Error Comparison and Analysis of Parallel and Constraint Mechanism for 3-TPS Hybrid Machine Tool

2011 ◽  
Vol 127 ◽  
pp. 277-282
Author(s):  
Peng Fei Dang ◽  
Li Jin Fang
Keyword(s):  
Machine Tool ◽  
Parallel Mechanism ◽  
Parallel Robot ◽  
Error Model ◽  
Position Error ◽  
Robot Kinematics ◽  
Motion Error ◽  
Movable Plate ◽  
Hybrid Machine Tool ◽  
Hybrid Machine

This paper establishes position error model based on parallel robot kinematics theory, and analyses position error of the 3-TPS hybrid machine tool. Firstly, to calculate position error of the movable plate caused by the parallel mechanism links, through error model of the parallel mechanism which is established through inverse kinematics of the hybrid machine tool. Then, according to the error model of constraint mechanism established by transformation matrix method, the position error has been simulated and calculated. Finally, this paper compares the effects of both mechanisms. The analysis indicates the link error of constraint mechanism has more influence on movable plate posture than parallel mechanism, and provides help with motion error compensation and kinematic calibration.

Comprehensive error modeling and compensation for optical free-form surface polishing machine tool

2015 ◽  
Vol 23 (6) ◽  
pp. 1587-1597 ◽  
Author(s):  
张恩忠 ZHANG En-zhong ◽  
赵继 ZHAO Ji ◽  
冀世军 JI Shi-jun ◽  
林洁琼 LIN Jie-qiong ◽  
李刚 LI Gang
Keyword(s):  
Machine Tool ◽  
Error Modeling ◽  
Free Form ◽  
Surface Polishing ◽  
Free Form Surface ◽  
Polishing Machine

A New P System Based Genetic Algorithm

2016 ◽  
Vol 4 (1) ◽  
pp. 165
Author(s):  
Caiping Hou ◽  
Xiyu Liu
Keyword(s):  
Genetic Algorithm ◽  
Genetic Drift ◽  
Parallel Mechanism ◽  
Membrane Computing ◽  
P System

<p>For the “early convergence” or the “genetic drift” of the genetic algorithm, this paper proposes a new genetic algorithm based on P system. Based on the parallel mechanism of P system in membrane computing, we put forward the new P system based genetic algorithm (PBGA). So that we can improve the performance of GA.</p>

scholarly journals Modelling and Simulation of Machine Tool Prototype with 6DOF Parallel Mechanism in Matlab / Simulink

2019 ◽  
Vol 254 ◽  
pp. 03002 ◽  
Author(s):  
Vladimír Bulej ◽  
Juraj Uríček ◽  
Manfred Eberth ◽  
Ivan Kuric ◽  
Ján Stanček
Keyword(s):  
Machine Tool ◽  
Simulation Model ◽  
Mechanical System ◽  
Parallel Mechanism ◽  
Control Algorithms ◽  
Kinematic Structure ◽  
Matlab Simulink ◽  
Parallel Kinematic ◽  
Functional Blocks ◽  
Functional Prototype

The article deals with the preparation of simulation model of mechanism with parallel kinematic structure called hexapod as an electro-mechanical system in software MATLAB/Simulink. The simulation model is composed from functional blocks represented each part of mechanism’s kinematic structure with certain properties. The results should be used for further simulation of its behaviour as well as for generating of control algorithms for real functional prototype.

Kinematics Analysis of a New 5 DOF Parallel-Serial Machine Tool Based on the Vector Method

2010 ◽  
Vol 450 ◽  
pp. 283-287 ◽  
Author(s):  
Rui Wang ◽  
Gang Ding ◽  
Shi Sheng Zhong
Keyword(s):  
Machine Tool ◽  
Parallel Mechanism ◽  
Kinematics Analysis ◽  
Vector Method ◽  
Velocity Transformation ◽  
Axis Parallel ◽  
Movable Platform ◽  
Parameter Coupling ◽  
The Relationship ◽  
Kinematics Parameters

A 5-axis parallel-serial machine tool is proposed, which consists of a 3-DOF parallel mechanism and a 2-DOF serial mechanism, and the kinematics analysis is discussed in detail based on the vector method. The size of the velocity transformation matrix is decreased. The problem of parameter coupling is resolved by adopting identity matrix and four-element vector. The relationship between the velocity and acceleration of the movable platform and the input parameters of the parallel mechanism is established. These algorithms are verified correct through ADAMS (Automatic Dynamic Analysis of Mechanical System) and can be referenced by kinematics analysis, dynamics analysis of parallel or parallel-serial machine tools, which have coupling kinematics parameters.

Optimal Design of 6-UPU Parallel Mechanism

2011 ◽  
Vol 480-481 ◽  
pp. 1055-1060
Author(s):  
Guang Hua Wu ◽  
Lie Hang Gong ◽  
Xin Wei Ji ◽  
Zhong Jun Wu ◽  
Yong Jun Gai
Keyword(s):  
Genetic Algorithm ◽  
Genetic Algorithms ◽  
Optimal Design ◽  
Objective Function ◽  
Parallel Mechanism ◽  
Design Space ◽  
Jacobian Matrix ◽  
Optimal Model ◽  
The Real ◽  
Universal Joints

The methodology of the optimal design for the 6-UPU parallel mechanism (PM) is presented based on genetic algorithms. The optimal index which expressed by Jacobian matrix of the PM is first deduced. An optimal model is established, in which the kinematic dexterity of a parallel mechanism is considered as the objective function. The design space, the limiting length of the electric actuators and the limit angles of universal joints are taken as constraints. The real-encoding genetic algorithm is applied to the optimal design of a parallel mechanism, which is proved the validity and advantage for the optimal design of a similar mechanism.

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