Study on Machine Accuracy of the Serial-Parallel Machine Tool Based on the BP Neural Network

2009 ◽  
Vol 407-408 ◽  
pp. 140-145
Author(s):  
Xu Ming Pei ◽  
Jie Liu ◽  
Chao Zhang
Keyword(s):  
Neural Network ◽  
Machine Tool ◽  
Bp Neural Network ◽  
Error Compensation ◽  
Degrees Of Freedom ◽  
Simulation Analysis ◽  
Control Strategies ◽  
Parallel Machine ◽  
Machine Accuracy ◽  
Parallel Machine Tool

It were researched that the modeling methods of machine accuracy and the control techniques of the error compensation based on BP neural network(BPNN) for parallel machine tool(PMT)with five degrees of freedom(DOF). The samples are obtained to train the BP neural network which has good capacity for non- liner mapping, learning and generalization. The machine accuracy mathematics model is established for the error compensation, in order to study the nonlinear input and output problem of the parallel machine which difficultly modeling described. The trained neural network was applied to error compensation of PMT to realize modifying errors real-timely. Finally, simulation analysis was performed through the MATLAB software. The results expressed that the control strategies for error compensation were simple, efficient and practicable. Machine accuracy can be increased greatly after compensation.

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

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.

scholarly journals Enhancing PKM Accuracy by Separating Actuation and Measurement: A 3DOF Case Study

2010 ◽  
Vol 2 (3) ◽  
Author(s):  
David Corbel ◽  
Olivier Company ◽  
Sébastien Krut ◽  
François Pierrot
Keyword(s):  
Machine Tool ◽  
Parallel Machine ◽  
Measuring System ◽  
Parallel Kinematics ◽  
Machine Accuracy ◽  
Control Schemes ◽  
Measurement Concept ◽  
Parallel Machine Tool ◽  
Independent Measuring

This paper proposes an approach for enhancing parallel kinematics machine accuracy by separating actuation and measurement. We describe the interest of the separation actuation and measurement concept and define the sensor redundancy used for designing the measurement device. Then, we present the design of a parallel machine-tool prototype with an independent measuring system, MoM3, as well as the optimization of its measuring system. Lastly, we present the control schemes used on the prototype, and provide experimental results to show the efficiency of separation actuation and measurement applied to a machine-tool.

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.

A Novel 5-DOF NC Serial-Parallel Machine Tool and its Position Analysis

2010 ◽  
Vol 431-432 ◽  
pp. 355-360
Author(s):  
Hong Jun San ◽  
Shi Sheng Zhong ◽  
Zhi Xing Wang
Keyword(s):  
Machine Tool ◽  
Analytical Method ◽  
Parallel Mechanism ◽  
Degrees Of Freedom ◽  
Structural Characteristics ◽  
Parallel Machine ◽  
Numerical Control ◽  
Forward Solution ◽  
In Series ◽  
Parallel Machine Tool

In this paper, a novel 5 degrees-of-freedom (DOF) numerical control (NC) serial-parallel machine tool is proposed. It can provide 3 translational DOF and 2 rotational DOF. The proposed mechine tool is composed of a 2-TPR/2-TPS special 4-DOF parallel mechanism in series with a rotatable component. The structure of this machine tool is simple. The machine tool can process the workpieces which have complex surfaces.The structural characteristics of this machine tool is introduced. The position inverse solution of this machine tool is deduced by analytical method and the position forward solution of this machine tool is achieved by numerical method.

Prediction of Machine Tool Thermal Error Compensation Based on SVMR and ARM11

2015 ◽  
Vol 740 ◽  
pp. 120-126
Author(s):  
Zhi Peng Zhang ◽  
Kang Liu ◽  
Feng Guo
Keyword(s):  
Neural Network ◽  
Support Vector Machine ◽  
Machine Tool ◽  
Bp Neural Network ◽  
Error Compensation ◽  
Thermal Error ◽  
Support Vector ◽  
Experiment Research ◽  
Further Development ◽  
Thermal Error Compensation

In order to improve the process precision of the machine tool, further development of SVMR was achieved by QT Creator. Support vector machine was applied to the ARM11 development board, SVMR model was online trained and real-time predicted the values of machine tool thermal error. Compared with the widely used BP neural network, this method has the characteristics of high compensation precision and strong generalization ability. Experiment research has proved that the stronger effectiveness and higher accuracy using this method.

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

Accuracy Analysis and Simulation of Three Degrees of Freedom Parallel Machine Tool

2010 ◽  
Vol 37-38 ◽  
pp. 73-76
Author(s):  
Xing Shan Li ◽  
Jun Wang ◽  
Guang Qi Cai
Keyword(s):  
Machine Tool ◽  
Degrees Of Freedom ◽  
Influence Factors ◽  
Parallel Machine ◽  
Matrix Methods ◽  
Fixed Base ◽  
Moving Platform ◽  
Parallel Machine Tool ◽  
Serial Chains ◽  
Three Degrees Of Freedom

This paper proposes a novel three degrees of freedom parallel machine tool. The parallel machine tool consists of three serial chains and a fixed base and a moving platform which can be moved in a pose space corresponding to the three degrees of freedom. By using matrix methods, a error model of the parallel machine was developed. The explicit solution of the error of joint and the stroke error of telescopic link were solved for analysis of influence factors of error on the position of moving platform. It provided a theoretical foundation for error compensation of parallel machine tool.

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