Abstract
This article presents a performance evaluation of a flexible manufacturing system (FMS), in which the system and its components can have different performance levels ranging from perfect functioning to total failure. An original multistate transition process for the FMS’s main component, Computerized Numerical Control (CNC) machine tools, proposed in the current article and treated as an aging process because of its increasing failure rate is investigated. The Markov reward approach is utilized to analyze the availability of CNC machine tools and sensitivity analysis of each non-operational state to the machine’s downtime. To overcome the “state explosion problem” in the subsequent FMS performance evaluation process, an application of the Lz-transform method is proposed to determine the performance evaluation and availability of such aging multistate FMS. An illustrated case is presented to demonstrate the performance evaluation process. The results show that the suggested methods can be implemented in engineering decision making and construction of various aging multistate FMS related to demands, availability, and output performance.
Highlights
Fierce competition in the market of the manufacturing sector and various customer preferences constantly challenge the diversity of manufacturing firms’ products and their resilience to rapid technological change and to shorten the product life cycle
The setup preparation activities existing in the actual production of Computerized Numerical Control (CNC) machine tools were
The setup preparation activities existing in the actual production of CNC machine tools were included to establish a novel multistate transitions process of CNC machine tools in the current paper, included to establish a novel multistate transitions process of CNC machine tools in the current which demonstrated the production flexibility of the machines as well as the flexible manufacturing system (FMS)
Summary
Fierce competition in the market of the manufacturing sector and various customer preferences constantly challenge the diversity of manufacturing firms’ products and their resilience to rapid technological change and to shorten the product life cycle. The disturbances caused by these breakdowns lead to scheduling problems, which decrease the productivity of the entire manufacturing operations This issue points out an important need for the consideration of machine reliability in the performance evaluation process of FMS, especially in light of the increasing complexity of such systems in recent years. A system-level FMS performance evaluation method based on the Markov reward approach and Lz-transform method is proposed in the current article to analyze the output performance of different products and availability of the whole FMS, which includes various aging multistate CNC machine tools and non-always available. Concluding remarks and the application of the proposed method are presented
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