Stochastic production systems: production and maintenance scheduling with finite buffers

2003 ◽  
Author(s):  
J.J. Westman ◽  
E.K. Boukas ◽  
F.B. Hanson
Keyword(s):  
Production Systems ◽  
Maintenance Scheduling ◽  
Finite Buffers ◽  
Stochastic Production

Modelling and Design of Closed-Loop Manufacturing Systems

2013 ◽  
Vol 378 ◽  
pp. 367-374 ◽  
Author(s):  
Andrey A. Kutin ◽  
Mikhail Turkin
Keyword(s):  
Analytical Method ◽  
Flexible Manufacturing ◽  
Manufacturing Systems ◽  
Manufacturing System ◽  
Flexible Manufacturing System ◽  
Closed Loop ◽  
Production Systems ◽  
Finite Buffers ◽  
Unreliable Machines

This paper introduces an analytical method for evaluating the performance of closed loop manufacturing systems with unreliable machines and finite buffers. The method involves transforming an arbitrary loop into one without thresholds and then evaluating the transformed loop using a new set of decomposition equations. It is more accurate than existing methods and is effective for a wider range of cases. The convergence reliability, and speed of the method are also discussed. In addition, observations are made on the behavior of closed loop production systems under various conditions. Finally, the method is used in a case study to design a flexible manufacturing system for production of aerospace parts.

scholarly journals Technical Efficiency of Yam Producers: The Case of the Municipality of Glazoue in Benin

2020 ◽  
Vol 13 (3) ◽  
pp. 24
Author(s):  
Jean Adanguidi ◽  
Cocou Jaures Amegnaglo
Keyword(s):  
Technical Efficiency ◽  
Agricultural Production ◽  
Production Systems ◽  
Efficiency Score ◽  
Stochastic Production Frontier ◽  
Production Frontier ◽  
Access To Credit ◽  
The Mean ◽  
Stochastic Production ◽  
Agricultural Yields

In Benin republic, yam plays an important role both in production systems and in people’s food security and trade. In view of the decline in agricultural yields in recent years combined with strong population growth, it is essential today to analyse the technical efficiency of yam producers in order to formulate the best recommendations for relaunching yam production. The objective of this paper is to analyse the technical efficiency of yam producers in Benin and its determinants. To achieve this objective, data were collected from 150 yam producers living in the Municipality of Glazoué. A stochastic production frontier is used to analyse the technical efficiency of the yam producer. The results revealed that the mean efficiency score of producers is around 80%. This implies that yam production could be increase by 20% through better use of available resources such as land, labour, herbicides, taking into account the state of technology. Access to credit and mobile phone ownership increase the inefficiency of actors while experience in agricultural production, age and household size reduce the inefficiency of producers.

Scheduling of Machine Startup and Shutdown to Reduce Energy Consumption in Bernoulli Production Lines

2012 ◽  
Author(s):  
Guorong Chen ◽  
Liang Zhang ◽  
Jorge Arinez ◽  
Stephan Biller
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Production Systems ◽  
Numerical Study ◽  
Effective Control ◽  
Efficient Production ◽  
Reliability Model ◽  
Production Lines ◽  
Finite Buffers ◽  
Automotive Paint

Effective control of production operations usually leads to improved energy efficiency in manufacturing systems. In this paper, we investigate energy consumption reduction in production systems by scheduling of machine startup and shutdown. Specifically, we consider serial production lines with finite buffers and machines having Bernoulli reliability model. This machine reliability model is applicable in production situations, where the downtime is relatively short and comparable to machine cycle time (e.g., automotive paint shops and general assembly). Using transient analysis of the systems at hand, an analytical performance evaluation technique is developed for Bernoulli serial lines with time-dependent machine efficiencies. In addition, trade-off between productivity and energy-efficiency in production systems is discussed and the energy-efficient production problem is formulated as a constrained optimization problem. The effects and practical implications of operations schedule are demonstrated using a numerical study on automotive paint shop operations.

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