Study on Workpiece Machining Precision PID Control Model in Closed-Loop Manufacturing Systems

2009 ◽  
Vol 419-420 ◽  
pp. 469-472 ◽  
Author(s):  
Jun Lu ◽  
Yu Mei Huang ◽  
Wen Wen Li ◽  
Yang Liu ◽  
Hua Zhong
Keyword(s):  
Pid Control ◽  
Error Compensation ◽  
Manufacturing Systems ◽  
Manufacturing System ◽  
Closed Loop ◽  
Theoretical Foundation ◽  
Control Model ◽  
Machining Precision ◽  
Processing Error

In this paper, a new concept named “Closed-loop Manufacturing System” (CLMS) is proposed. The Workpiece Machining Precision PID Control Model (WMPPCM) is outlined firstly, in which PID model expressions are structured and the role of proportion, integration, differential adjustment are analyzed. Then, the experimental method of WMPPCM is established to verify the feasibility and validity of this model. In the experiment, WMPPCM could be utilized to estimate the trend of processing error so as to conduct the adjustment before production. It is also proved that WMPPCM in CLMS has a significant effect on error compensation, which builds up the theoretical foundation for paper research on CLMS in terms of WMPPCM.

Research on Workpiece Machining Precision PID Control Model in Closed-Loop Manufacturing Systems

2009 ◽  
Vol 16-19 ◽  
pp. 1174-1178 ◽  
Author(s):  
Jun Lu ◽  
Yu Mei Huang ◽  
Yang Liu ◽  
Wen Wen Li ◽  
Hua Zhong
Keyword(s):  
Experimental Method ◽  
Pid Control ◽  
Error Compensation ◽  
Manufacturing Systems ◽  
Manufacturing System ◽  
Closed Loop ◽  
Control Model ◽  
Cnc Machining ◽  
Machining Error ◽  
Machining Precision

In this article, a new concept named ‘Closed-loop Manufacturing System’ (CLMS) is introduced. The Workpiece Machining Precision PID Control Model (WMPPCM) is proposed and described. PID error compensation model expressions are structured. The experimental method of WMPPCM is established. In the experiment, WMPPCM could be utilized to estimate the trend of machining error so as to conduct the adjustment before production. The experiment has verified the feasibility and validity of WMPPCM. The experiments have also proved that WMPPCM can decrease machining error more effectively then traditional CNC machining method.

The Reserch on PID Control Modle of the Components Working Accuracy for Slender Shaft on the NC Lathe

2011 ◽  
Vol 403-408 ◽  
pp. 727-731
Author(s):  
Yu Kun Wang ◽  
Jun Lu ◽  
Hong San Xi
Keyword(s):  
Pid Control ◽  
Error Compensation ◽  
Closed Loop ◽  
Black Box ◽  
Programming System ◽  
Automatic Programming ◽  
Control Points ◽  
Manufacture System ◽  
Processing Error ◽  
System Deviation

In this article, a PID control modle of working accuracy is constructed to control the processing process，regarding the closed loop manufacture system as a black box and the processing error as system deviation. A slender shaft with a surface is turned,the control points of the error compensation can be abtained by a probe.Based on the CAM technology，an automatic programming system is developmented to control the processing process.Through a set of comparative experiments,the detaction and the analysis of datas confirmed the validity of the PID control modle,validated the accuracy of the slender shaft can be improved by the PID control modle.

Kinematic and Dynamic Analysis for Closed-Loop Flexible Manufacturing Systems Using Nonlinear Recursive Method

2006 ◽  
Vol 505-507 ◽  
pp. 1015-1020
Author(s):  
Yunn Lin Hwang ◽  
Shen Jenn Huang
Keyword(s):  
Dynamic Analysis ◽  
Flexible Manufacturing ◽  
Manufacturing Systems ◽  
Manufacturing System ◽  
Closed Loop ◽  
Recursive Method ◽  
Coupled Equations ◽  
Joint Reaction Forces ◽  
Reaction Forces ◽  
Joint Reaction

In this paper, a nonlinear recursive method for the dynamic and kinematic analysis of a closed-loop flexible manufacturing system is presented. The kinematic and dynamic models are developed using absolute reference, joint relative, and elastic coordinates as well as joint reaction forces. This recursive method leads to a system of loosely coupled equations of motion. In a closed-loop manufacturing system, cuts are made at selected secondary joints in order to form spanning tree structures. Compatibility conditions and reaction force relationships at the secondary joints are adjoined to the equations of open-loop manufacturing systems in order to form closed-loop kinematic and dynamic equations. Using the sparse matrix structure of these equations and the fact that the joint reaction forces associated with elastic degrees of freedom do not represent independent variables, a method for decoupling the joint and elastic accelerations is developed. Unlike existing recursive formulations, this method does not require inverse or factorization of large nonlinear matrices. The application of nonlinear recursive method in kinematic and dynamic analysis of closed-loop manufacturing systems is also discussed in this paper. The use of the numerical algorithm developed in this investigation is illustrated by a closed-loop flexible four-bar mechanism.

Based on the Nc Machining System Error Aspheric Analysis and Research

2011 ◽  
Vol 383-390 ◽  
pp. 7649-7653
Author(s):  
Hong Ying Wang ◽  
Xue Me Hu
Keyword(s):  
Error Compensation ◽  
Dynamic Error ◽  
Machining Process ◽  
System Error ◽  
Machining Precision ◽  
Processing Error ◽  
Machining Errors ◽  
Machining System ◽  
Forward Process

From the machining errors and static dynamic error influence two aspects are discussed in this paper, the analysis of machining process on the processing precision influence of error, puts forward process design. Long-term since, improving precision machine tool is through the two methods: error and avoid error compensation. Avoid error is a "hard", focusing on design and processing in the error may eliminate all stages. And error compensation in existing machine, can work environment to further improve the machining precision, it is a kind of economic effectively improve the machining precision of the method. For error analysis and calculation, the ultimate goal is to eliminate and reduce processing error, the improvement of the machining errors of classification in many ways. According to the machining process of the factors causing error to occur any regularity, processing error into system error and the random error, According to the nature of the changes with time, and can be divided into static error and dynamic error.

Modelling and Design of Closed-Loop Manufacturing Systems

2013 ◽  
Vol 378 ◽  
pp. 367-374 ◽  
Author(s):  
Andrey A. Kutin ◽  
Mikhail Turkin
Keyword(s):  
Analytical Method ◽  
Flexible Manufacturing ◽  
Manufacturing Systems ◽  
Manufacturing System ◽  
Flexible Manufacturing System ◽  
Closed Loop ◽  
Production Systems ◽  
Finite Buffers ◽  
Unreliable Machines

This paper introduces an analytical method for evaluating the performance of closed loop manufacturing systems with unreliable machines and finite buffers. The method involves transforming an arbitrary loop into one without thresholds and then evaluating the transformed loop using a new set of decomposition equations. It is more accurate than existing methods and is effective for a wider range of cases. The convergence reliability, and speed of the method are also discussed. In addition, observations are made on the behavior of closed loop production systems under various conditions. Finally, the method is used in a case study to design a flexible manufacturing system for production of aerospace parts.

Development of Prototype of Two Axis Gimbal-Type Platform in Underwater

2020 ◽  
Author(s):  
Hoonmin Park ◽  
Hyunjae Lee ◽  
Hongryul Ryu ◽  
Dongho Kim ◽  
Hyunsoo Kim ◽  
...  
Keyword(s):  
Marine Environment ◽  
Pid Control ◽  
Error Compensation ◽  
Precise Measurement ◽  
Control Method ◽  
Working Environment ◽  
Observation Data ◽  
Continuous Observation ◽  
Environment Analysis

Abstract The Bottom-mounted ocean-observation platforms installed on the seabed have been used for marine environment analysis. The role of the observing platform is to collect precise observation data without human assistance. However, their working environment is very harsh so the typical device could not afford to provide easy accessibility during their working period. Existing bottom-mounted ocean-observation platforms have been difficult to collect continuous observation data. Therefore, this paper suggests a new ocean-observation platform for precise measurement of the marine environment. Suggested platform uses a PID control method to be applied for error compensation of each axis of gimbal. To verify the system performance, the experiment was carried out in the air with the external force applied to this system.

scholarly journals Role of Ontologies for CPS Implementation in Manufacturing

2015 ◽  
Vol 6 (4) ◽  
pp. 26-32 ◽  
Author(s):  
Marco Garetti ◽  
Luca Fumagalli ◽  
Elisa Negri
Keyword(s):  
Domain Knowledge ◽  
Manufacturing Systems ◽  
Manufacturing System ◽  
Cyber Physical Systems ◽  
Physical Systems ◽  
Network Connection ◽  
Manufacturing Applications ◽  
And Storage ◽  
Embedded Intelligence

Abstract Cyber Physical Systems are an evolution of embedded systems featuring a tight combination of collaborating computational elements that control physical entities. CPSs promise a great potential of innovation in many areas including manufacturing and production. This is because we obtain a very powerful, flexible, modular infrastructure allowing easy (re) configurability and fast ramp-up of manufacturing applications by building a manufacturing system with modular mechatronic components (for machining, transportation and storage) and embedded intelligence, by integrating them into a system, through a network connection. However, when building such kind of architectures, the way to supply the needed domain knowledge to real manufacturing applications arises as a problem to solve. In fact, a CPS based architecture for manufacturing is made of smart but independent manufacturing components without any knowledge of the role they have to play together in the real world of manufacturing applications. Ontologies can supply such kind of knowledge, playing a very important role in CPS for manufacturing. The paper deals with this intriguing theme, also presenting an implementation of this approach in a research project for the open automation of manufacturing systems, in which the power of CPS is complemented by the support of an ontology of the manufacturing domain.

Research on PID Control Model for Error Compensation in Milling Thin-Wall Parts

2011 ◽  
Vol 127 ◽  
pp. 522-526
Author(s):  
Lei Zhu ◽  
Jun Lu ◽  
Yan Liu
Keyword(s):  
Pid Control ◽  
Error Compensation ◽  
Control Model ◽  
Thin Wall ◽  
Cnc Milling ◽  
Machining Error ◽  
Proportional Integral ◽  
Improving Accuracy

Accuracy of machined components is one of the most critical considerations for any manufacturer. To improve the accuracy by diminishing errors in CNC milling thin-wall parts, this article analyzes sources of errors and provides PID control model to error compensation, namely acquiring offset value by calculating the coefficients of proportional, integral and differential and corresponding errors, and then adjusts codes of next processes. The effectiveness of PID control model in improving accuracy is testified by experiments contrasting with groups of non-compensation and completely-compensation. The experiments have proved that PID control model of CNC milling thin-wall parts can predict machining error trends and have advance regulation.

Sign in / Sign up

Export Citation Format

Share Document