Design Criteria for Multi-Axis Closed Loop Computer Numerical Control Systems

1974 ◽  
Vol 96 (1) ◽  
pp. 36-40 ◽  
Author(s):  
A. E. Middleditch
Keyword(s):  
Control Systems ◽  
Machine Tools ◽  
Closed Loop ◽  
Position Control ◽  
Dynamic Performance ◽  
General Purpose ◽  
Automatic Machine ◽  
Numerical Control ◽  
Design Criteria ◽  
Control Loops

Automatic machine tools have traditionally been controlled by hard-wired numerical controllers (NC). Recently, systems have been introduced which use a general purpose mini-computer (CNC). Some of these computer systems generate position references and close the position control loops of the machine tool’s feed axes using software, while others retain these functions in hardware. If the software approach is used, the dynamic performance of the system may be degraded. This paper investigates the constraints necessary to avoid severe performance degradation.

Plattformunabhängige NC-Kernerweiterung*/Platform-independent NC-core extensions

2016 ◽  
Vol 106 (05) ◽  
pp. 320-324
Author(s):  
C. Prof. Brecher ◽  
T. Berners ◽  
M. Obdenbusch
Keyword(s):  
Software Development ◽  
Control Systems ◽  
Real Time ◽  
Machine Tools ◽  
Position Control ◽  
Numerical Control ◽  
Wird Eine ◽  
Model Based ◽  
Feed Drives

Einige Steuerungen von Werkzeugmaschinen gestatten es, durch NC (Numerical Control)-Kernerweiterungen auf Signale und Daten in Echtzeit zuzugreifen und diese zu manipulieren. Die Entwicklung der NC-Kernerweiterung ist jedoch geprägt von einer fehleranfälligen Phase der Programmierung. Es wird eine Methode vorgestellt, die einen Ansatz der modellgetriebenen Softwareentwicklung beschreibt, um schnell und zuverlässig NC-Kernerweiterungen am Beispiel der Regelung von Vorschubachsen zu entwickeln.   Some control systems of machine tools provide the opportunity to access signals and data by NC-core extensions in real time. Typical for the development of NC-core extensions is an error-prone phase of programming. This article presents a method which uses an approach of model-based software development to quickly generate reliable NC-core extensions. The method is exemplified by position control on feed drives.

Developments in Computer Control Systems for Machine Tools

1974 ◽  
Vol 188 (1) ◽  
pp. 49-75
Author(s):  
E. J. Wightman
Keyword(s):  
Control Systems ◽  
Machine Tools ◽  
Computer Control ◽  
General Purpose ◽  
Numerical Control ◽  
Practical Case ◽  
Control Machine Tool ◽  
The Subject ◽  
Control Machine ◽  
Digital Computers

This lecture sets out to review developments in numerical-control machine-tool technology with particular reference to the application of general-purpose digital computers to the control of individual machine tools or groups of machine tools, to meet the requirements of the end user. The subject matter embraces very broad-based technology, ranging from factors which directly contribute to machine utilization to the application of advanced digital-control techniques which directly contribute to the versatility of modern numerical-control machine tools. Thus, the lecture begins with a review of worldwide growth in numerical-control machine business and a discussion on the technological evolution of numerical-control systems with particular reference to the fast growing utilization of mini-computers. The subject is illustrated by a practical case history in the United Kingdom based on a computer control system developed by the author's firm for turning, milling, and boring machines. The lecture concludes with a review of operational benefits to be derived from the application of modern numerical-control machines to production processes and makes predictions concerning future developments in the application of general-purpose digital computers.

The Study of Closed-Loop Position Control System Based on CNC Processing

2014 ◽  
Vol 941-944 ◽  
pp. 2243-2246
Author(s):  
Xin Zhou
Keyword(s):  
Control System ◽  
Machine Tools ◽  
Closed Loop ◽  
Position Control ◽  
Machining Accuracy ◽  
Closed Loop Control ◽  
Loop Control ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Position Control System

In view of the existing problems of indirect position closed-loop control, a digitized closed-loop control method is presented and a new kind of position control system with fully digitized closed-loop based on that method is developed. In this way, the fully digitized control of cutter trajectory is implemented with the features of digitized driving, digitized measuring and digitized position control, so that the machining accuracy of the NC machine tools is effectively assured. This system has been used on varieties of NC machine tools and very good results have been obtained in the machining of complex precision parts.

A Digital Compensator Design for Electrohydraulic Single-Rod Cylinder Position Control Systems

1990 ◽  
Vol 112 (3) ◽  
pp. 403-409 ◽  
Author(s):  
J. Watton
Keyword(s):  
Control Systems ◽  
Closed Loop ◽  
Position Control ◽  
Open Loop ◽  
Closed Loop System ◽  
Forward Algorithm ◽  
Loop Transfer Function ◽  
Compensator Design ◽  
Feedback Algorithm ◽  
Position Control System

A digital compensator using a forward algorithm, F(z−1), and a feedback algorithm, H(z−1), is developed for an electrohydraulic position control system incorporating an underlapped servovalve and a single-rod cylinder. The main problems encountered with designing such a closed-loop system are discussed, and it is shown how the filter coefficients may be easily determined for a particular class of open-loop transfer function. An excellent comparison between theory and experiment is obtained and it is deduced that one coefficient only need be changed in the forward algorithm for such gain-change dominant systems.

scholarly journals Integrated Communication and Control Systems: Part II—Design Considerations

1988 ◽  
Vol 110 (4) ◽  
pp. 374-381 ◽  
Author(s):  
Asok Ray ◽  
Yoram Halevi
Keyword(s):  
Control Systems ◽  
Dynamic Performance ◽  
Sufficient Conditions ◽  
System Stability ◽  
Time Varying ◽  
Control Loops ◽  
Analysis And Design ◽  
Integrated Communication ◽  
And Control ◽  
Analytical Approaches

Asynchronous time-division multiplexed networks, used in Integrated Communication and Control Systems (ICCS), introduce time-varying and possibly stochastic delays in the feedback control loops. The objective of this on-going research is to develop a comprehensive methodology for the analysis and design of the above class of delayed control systems. In the first part [1] of this two-part paper, we developed a discrete-time, finite-dimensional, time-varying model of the delayed control system; necessary and sufficient conditions for system stability have been established for periodically varying delays. This second part elucidates the significance of the above model relative to the system dynamic performance as well as addresses major criteria for and outlines alternative analytical approaches to ICCS design. Pertinent concepts are illustrated by simulation.

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