Abstract
A method of determining flexible manufacturing system performance (throughput capacity) based on identifying elementary controlled events that occur during FMS operation and controlling this flow based on Shannon approach to evaluation of the quantity of information required for control is proposed. The behavior of the main FMS elements in the manufacturing process is suggested to be described using three types of random flows of square pulses – state, availability and propagation flows. The proposed mathematical model enables to choose the optimum relationship between FMS power margins, parts and tools supply and throughput capacity.
Highlights
Modeling is the most important tool while creating flexible manufacturing systems (FMS)
The last question for FMS control systems determines the conditions in which computer-aided control system (CACS) is put in the process of plan implementation
Extension of FMS throughput capacity by means of CACS enables the implementation of a larger number of elementary controlled events at an average, while ensuring the required statistical parameters of the products propagation flow at FMS output
Summary
Modeling is the most important tool while creating flexible manufacturing systems (FMS). The determining of FMS performance (throughput capacity) is important at its design stage This requires the development of a model that adequately reflects the process and uses statistical data, available for relatively easy measurement on the operating FMS, as the source [19-24]. The volume of data to be received and processed by CACS for FMS when controlling an elementary event is usually quite steady and depends on the number of alternatives considered in the decision-making process. Their number is determined by the batch type, number of parts in a batch, time interval between sequential startups and the nature of startup and release (scheduled, ahead of schedule). The elementary event control function involves synchronization of operation of the main elements of manufacturing process in accordance with the defined plan
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