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A flexible real-time solution to modular design of an adaptive control system for turning
KTH, School of Industrial Engineering and Management (ITM), Production Engineering.ORCID iD: 0000-0001-6403-2878
1990 (English)Doctoral thesis, monograph (Other academic)
Abstract [en]

This thesis deals with the organization of an adaptive control system for turning and, furthermore, the development of an integration framework for subsystems in the adaptive control system. The thesis is organized in three main parts.

The first part of the thesis is devoted to a general discussion on adaptive control of machine tools and a presentation of the adaptive control plan that we are working on at our department. An opening discussion on economical and human aspects on automation leads to the conclusion that the need for optimizing machining costs becomes more obvious, as the time portion for machining increases due to reductions in non-productive time.

Optimization can be performed at various levels of a production system and an attempt to identify different levels is made. However, in this dissertation, I have focused my attention on the machine tool level and optimization by means of adaptive control. Since adaptive control can assume different shapes, one chapter is devoted to adaptive control definitions.

The development trends are highlighted in a state-of-the-art discussion. The market supply of adaptive control systems is limited to monitoring systems without any possibilities of feedback control except from emergency stop.

The most ambitious IMT/KTH adaptive control plan ends the first part.

The five subsystems of the IMT/KTH system are presented in the middle part .

Different monitoring, adaptive control constraint and adaptive control optimization functions are assigned to the different subsystems. Monitoring and control of machining operations is based on measurements of machining characteristics and the subsystems include a number of advanced sensor systems, which are described.

In the final part the integration framework is presented. The stochastic nature of the machining process calls for real-time control of machining conditions. The subsystems are designed to operate in a relatively independent manner. Consequently, computer technologies for real-time and distributed control have been employed to realize a flexible modular system architecture for the adaptive control system. The layout of the system as well as the adaptive control strategy are presented. It is stated that the presented adaptive control system with its present adaptive control strategy constitutes a development platform, well-prepared for extensions based on future research results.

Place, publisher, year, edition, pages
Stockholm: KTH , 1990. , x, 104 p.
, TRITA-IMT, ISSN 0284-537 ; 02:88
Keyword [en]
Turning, adaptive control, real-time control
National Category
Production Engineering, Human Work Science and Ergonomics
URN: urn:nbn:se:kth:diva-26029OAI: diva2:369063
Public defence
1990-11-02, Kollegiesalen, Administrationsbyggnaden, Valhallavägen 70, KTH, Stockholm, 10:00 (English)
QC 20101125Available from: 2010-11-25 Created: 2010-11-09 Last updated: 2010-12-01Bibliographically approved

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