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[ pdf ] Supervisory Machine Control by Predictive-Reactive Scheduling

Supervisory Machine Control  by Predictive-Reactive Scheduling Download
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Topic under  Control Engineering
Source: alexandria.tue.nl 
File size: 2.3 MB
File type: pdf
Last download on: Sat Mar 25, 2017 02:42:42 PM
Short Desciption:
Supervisory control theory and scheduling theory. Wonham et al. ..... 2.1.3 Predictive scheduling in Supervisory Machine Control

Summary:
The subject of this thesis is supervisory control of complex manufacturing machines. ASML wafer scanners serve as carriers. A wafer scanner is a representative example of a complex manufacturing machine, containing many mechatronic systems. In complex manufacturing machines, many options exist to deploy the available resources to perform tasks that lead to the desired manufacturing purpose, resulting in various machine behaviors. Supervisory Machine Control (SMC) is responsible for deciding when to do which tasks using which resources. The purpose of this project is to develop a suitable formal method for speci cation of supervisory control of complex manufacturing machines. There are some complicating requirements for SMC of complex manufacturing machines. First of all, the manufacturing tasks are heavily product recipe dependent, for which SMC must be exible. This means that SMC must be able to handle a stream of mixed product types, which are being processed concurrently. Secondly, SMC must be able to optimize machine behavior by exploiting its resources in a best way possible within its manufacturing constraints. What is best, may depend on the characteristics of the recipe. Thirdly, SMC must t in the dynamic environment that it is embedded in. This implies that it must react to all kinds of triggers from the environment without introducing unnecessary control overhead. A very important trigger is task failure: an exception, which requires a recovery reaction of SMC to avoid human intervention. Finally, in order to keep up with the increasing development pace in industry, SMC should allow easy adding and changing of functionality.
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