The Error Compensation Strategy of 3-TPT Parallel Machine Tool Based on Semi-Closed Loop Control

2011 ◽  
Vol 321 ◽  
pp. 176-179
Author(s):  
Jian Ye Guo ◽  
Zhong Qi Sheng ◽  
Liang Zhao
Keyword(s):  
Machine Tool ◽  
Error Compensation ◽  
Closed Loop ◽  
Parallel Machine ◽  
Control Mode ◽  
Closed Loop Control ◽  
Kinematics Analysis ◽  
Compensation Strategy ◽  
Loop Control ◽  
Parallel Machine Tool

This paper took a kind of 3-TPT Parallel Machine Tool (PMT) as the object of research; it mainly introduced the process of establishing the compensation strategy for this PMT. Firstly the kinematics equation of this PMT was established on the basis of kinematics analysis, the results showed that the kinematics equation of this PMT have characteristics that are simple calculation, explicit expression and unique solution. Then according to the structural characteristics and the results of kinematics analysis, the error compensation strategy of feedback correction type with the semi-closed loop control mode was used in the error compensation for this PMT by the method of assembling the gratings on the driving rods, namely the compensation way of “parallel driving and parallel feedback” was adopted. The research results in this paper provided a theoretical basis for realizing error compensation of this PMT, and had important practical significance for improving machining precision of PMT.

Research on Error Compensation by Semi-Closed Loop Control for a 3-UPS Parallel Machine Tool

2012 ◽  
Vol 461 ◽  
pp. 272-276
Author(s):  
Jian Ye Guo ◽  
Jia Shun Shi ◽  
Liang Zhao
Keyword(s):  
Machine Tool ◽  
Error Compensation ◽  
Closed Loop ◽  
Parallel Machine ◽  
Control Mode ◽  
Closed Loop Control ◽  
Kinematics Analysis ◽  
Compensation Strategy ◽  
Loop Control ◽  
Parallel Machine Tool

This paper took a 3-UPS Parallel Machine Tool (PMT) as the object of research; it mainly introduced the process of establishing the compensation strategy for this PMT. Firstly the kinematics equations on driving chain and constraint chain was established on the basis of kinematics analysis. Then according to the structural characteristics and the results of kinematics analysis, the error compensation strategy of feedback correction type with the semi-closed loop control mode was used in the error compensation for this PMT by the method of installing respectively the encoders on the each joint of parallelogram mechanism, namely the compensation way of “parallel driving and series feedback” was adopted. Finally this paper has also deduced the theoretical model of error compensation. The research results in this paper provided a theoretical basis for realizing error compensation of this PMT, and had important practical significance for improving machining precision of PMT

Analysis on Influence of the Position Error of Joint Points in the Fixed Platform of 3-UPS Parallel Machine Tool

2012 ◽  
Vol 459 ◽  
pp. 203-206
Author(s):  
Jian Ye Guo ◽  
Yan Jin ◽  
Zhong Qi Sheng ◽  
Liang Zhao
Keyword(s):  
Machine Tool ◽  
Error Compensation ◽  
Inverse Kinematics ◽  
Theoretical Foundation ◽  
Mathematical Expression ◽  
Parallel Machine ◽  
Position Error ◽  
Kinematics Analysis ◽  
Independent Function ◽  
Parallel Machine Tool

This paper took one kind of 3-TPT Parallel Machine Tool (PMT) as the object of research. It mainly analyzed the influences of the position error of joint points in the fixed platform to the position error of tool of this PMT. Firstly, on the basis of introducing the structure of PMT, the kinematics of this machine was analyzed, and the inverse kinematics equation of this PMT was obtained. Then the influence situation of the position error of joint points in the fixed platform to the position error of tool was studied based on the kinematics analysis results and the error independent function principle, and the corresponding mathematical expression of error influence was established. Thus the theoretical foundation was laid for the comprehensive establishment of error model and the error compensation of this PMT

Backlash Compensation on CNC Machine Tool Based on Semi-Closed Loop Control

2011 ◽  
Vol 346 ◽  
pp. 644-649 ◽  
Author(s):  
Bin Feng ◽  
Xue Song Mei ◽  
Liang Guo ◽  
Dong Sheng Zhang ◽  
You Long Cheng
Keyword(s):  
Machine Tool ◽  
Closed Loop ◽  
Closed Loop Control ◽  
Cnc Machine Tool ◽  
Cnc Machine ◽  
Positional Accuracy ◽  
Loop Control ◽  
Open Cnc ◽  
Contouring Error ◽  
Open Cnc System

The positional accuracy and machining precision are mainly affected by backlash for semi-closed loop control CNC machine tool. And compensation for backlash is essential to improving the accuracy of machine tool. A method is developed to reduce contouring error in this paper. A simulated model of backlash and Open CNC system are used to verify compensation algorithm. Computational simulations and experimental results have shown that the contouring error due to backlash can be greatly reduced by using backlash compensation.

Development of NC System of the 3-PUU Parallel Machine Tool Based on PMAC

2010 ◽  
Vol 142 ◽  
pp. 233-237
Author(s):  
Hai Peng Lin ◽  
Yi Min Xu
Keyword(s):  
Machine Tool ◽  
Real Time ◽  
Degrees Of Freedom ◽  
Rocket Engine ◽  
Parallel Machine ◽  
Numerical Control ◽  
Interface Position ◽  
Loop Control ◽  
Nc System ◽  
Parallel Machine Tool

In this paper, a PUU parallel machine tool with three translational degrees of freedom (DOF) is designed which is usually used in the complex grain machining of the solid rocket engine.， and its numerical control system is described in detail. The so-called “PC+PMAC” is used as the hardware platform, and Windows as the software one, the parallel machine tool NC system is built. The features, such as multi-axis motion control and fast real time communication of PMAC, software resources and efficient data processing of PC are utilized such that Man Machine Interface, position servo control, real time measurement of cutter configuration and closed loop control of the parallel machine tool are realized.

Review on Error Compensation Technology of Parallel Machine Tool

2014 ◽  
Vol 800-801 ◽  
pp. 798-802
Author(s):  
Liang Zhou ◽  
Liu Tang ◽  
Ju Long Yuan ◽  
Da Gang Xie
Keyword(s):  
Machine Tool ◽  
Error Detection ◽  
Error Compensation ◽  
Parallel Machine ◽  
Research Trends ◽  
Error Modeling ◽  
Modeling Error ◽  
Development History ◽  
History Of ◽  
Parallel Machine Tool

This paper reviews the development history of parallel machine tool and new achievements in China and abroad. Typical methods of error modeling, error detection and error compensation are introduced. After analyzing the biggest problem of recent error compensation technology, this paper prospects the further research trends.

Hybrid Force/Position Control Investigation of Parallel Machine Tool with Redundant Actuation

2011 ◽  
Vol 121-126 ◽  
pp. 2040-2044 ◽  
Author(s):  
Hai Tao Tang ◽  
Jian Tao Yao ◽  
Li Cheng ◽  
Yong Sheng Zhao
Keyword(s):  
Machine Tool ◽  
Control Strategy ◽  
Position Control ◽  
Hybrid Control ◽  
Dynamic Performance ◽  
Parallel Machine ◽  
Inverse Kinematic ◽  
Control Mode ◽  
Redundant Actuation ◽  
Parallel Machine Tool

A novel redundantly actuated parallel machine tool was introduced. The inverse kinematic of 5-UPS/PRPU PMT with redundant actuation was analysed and the driven force of redundant actuation limb was planned. The force/position hybrid control strategy and dynamic differential calculation control strategy were proposed. Then the experiment of evaluating dynamics in the position control mode and in the force/position hybrid control was carried out respectively. The experiment shows that, the force/position hybrid control can improve driven torque of each limb better, balance the load of each limb and is of great help for enhance the dynamic performance of entire PMT.

The Kinematics Analysis of the 3-PTT Parallel Machine Tools

2014 ◽  
Vol 701-702 ◽  
pp. 784-787
Author(s):  
Ming Hu ◽  
Jia Shun Shi
Keyword(s):  
Machine Tool ◽  
Machine Tools ◽  
Jacobian Matrix ◽  
Parallel Machine ◽  
Kinematics Analysis ◽  
Kinematic Coupling ◽  
Parallel Machine Tools ◽  
Parallel Machine Tool

This paper presents the kinematics for 3-PTT parallel machine tools, the kinematic is analytically performed, the forward and inverse position kinematic equations are explicit functions and workspace is derived and there is no singularity configuration and kinematic coupling in the whole workspace. The manipulability analytical of the parallel machine tool is investigated by the Jacobian matrix.

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