Cross-Coupled Biaxial Computer Control for Manufacturing Systems

1980 ◽  
Vol 102 (4) ◽  
pp. 265-272 ◽  
Author(s):  
Yoram Koren
Keyword(s):  
Control Systems ◽  
Machine Tools ◽  
Manufacturing Systems ◽  
Computer Control ◽  
Control Program ◽  
Coupled System ◽  
System Control ◽  
Nc System ◽  
Control Loops ◽  
Contour Accuracy

Biaxial control systems for generating predetermined paths under load disturbances, such as encountered in NC and CNC systems for machine tools, are conventionally designed such that the control of each axis is independent of the other. The present paper is concerned with providing cross-couplings for biaxial control systems, whereby an error in either axis affects the control loops of both axes. An algorithm for a cross-coupled control system is presented, and the performance of the cross-coupled system is mathematically analyzed and compared with the conventional CNC system having individual axis control. It is shown that cross-coupling between axes improves the contour accuracy while the velocity response of each axis is only slightly reduced. Although the proposed cross-coupled system requires additional hardware for implementation with an NC system, operation with a CNC-based system requires only software modifications to the system control program.

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.

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.

A computer-control program for TEM in situ fatigue experiments

1989 ◽  
Vol 47 ◽  
pp. 620-621
Author(s):  
Kenneth S. Vecchio ◽  
John A. Hunt
Keyword(s):  
Slow Crack Growth ◽  
Computer Control ◽  
Control Program ◽  
Video Tape ◽  
Computer Control System ◽  
Transmission Electron ◽  
In Situ Experiments ◽  
Tremendous Amount ◽  
And Control

In-situ experiments conducted within a transmission electron microscope provide the operator a unique opportunity to directly observe microstructural phenomena, such as phase transformations and dislocation-precipitate interactions, “as they happen”. However, in-situ experiments usually require a tremendous amount of experimental preparation beforehand, as well as, during the actual experiment. In most cases the researcher must operate and control several pieces of equipment simultaneously. For example, in in-situ deformation experiments, the researcher may have to not only operate the TEM, but also control the straining holder and possibly some recording system such as a video tape machine. When it comes to in-situ fatigue deformation, the experiments became even more complicated with having to control numerous loading cycles while following the slow crack growth. In this paper we will describe a new method for conducting in-situ fatigue experiments using a camputer-controlled tensile straining holder.The tensile straining holder used with computer-control system was manufactured by Philips for the Philips 300 series microscopes. It was necessary to modify the specimen stage area of this holder to work in the Philips 400 series microscopes because the distance between the optic axis and holder airlock is different than in the Philips 300 series microscopes. However, the program and interfacing can easily be modified to work with any goniometer type straining holder which uses a penrmanent magnet motor.

scholarly journals Discrete Event System Control in Max-Plus Algebra: Application to Manufacturing Systems

2020 ◽  
Vol 53 (4) ◽  
pp. 143-150
Author(s):  
Gabriel Freitas Oliveira ◽  
Renato Markele Ferreira Candido ◽  
Vinicius Mariano Gonçalves ◽  
Carlos Andrey Maia ◽  
Bertrand Cottenceau ◽  
...  
Keyword(s):  
Manufacturing Systems ◽  
Discrete Event ◽  
Discrete Event System ◽  
System Control ◽  
Event System

Quantitative Models for Complex Physical Systems

2014 ◽  
Vol 1061-1062 ◽  
pp. 1144-1147
Author(s):  
Jun Fu ◽  
Jin Zhao Wu ◽  
Ning Zhou ◽  
Hong Yan Tan
Keyword(s):  
Quantitative Analysis ◽  
State Space ◽  
Control Systems ◽  
Chemical Reaction ◽  
Metric Space ◽  
Manufacturing Systems ◽  
Quantitative Model ◽  
Hybrid Automata ◽  
Physical Systems ◽  
The Difference

We present a quantitative model, called metric hybrid automata, for quantifying the behaviors of complex physical systems, such as chemical reaction control systems, manufacturing systems etc. Due to the introduction of a metric, the state space of hybrid automata forms a metric space, in which the difference of states can be quantified. Furthermore, in order to reveal the distance of system behaviors, we construct the simulation distance and the bisimulation distance, which quantify the similarity of system behaviors. Our model provides the basis for quantitative analysis for those complex physical systems.

On Adaptation Algorithms for Computer Control Systems

1972 ◽  
Vol 5 (1) ◽  
pp. 109-116
Author(s):  
V.P. Zhivoglyadov ◽  
A.V. Medvedev ◽  
B.M. Mirkin
Keyword(s):  
Control Systems ◽  
Computer Control
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