Buffer stocks in automatic transfer lines

Kay, Emanuel

doi:10.1080/00207547208929916

Cited by 24 publications

(5 citation statements)

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“…Analytical results for lines with two machines and one buffer are found in Prakasa Rao (1975), Okamura and Yamashina (1977) and Gershwin and Berman (1978). Simulation studies have also been conducted by various investigators (Barten 1962, Freeman 1964, Anderson and Moodie 1969, Kay 1972.…”

Section: Introductionmentioning

confidence: 90%

Event-driven model of unreliable production lines with storage

D'Angelo

Caramanis

Finger

et al. 1988

International Journal of Production Research

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We have developed an event-driven algorithm for simulating a factory production line with storage. Using this algorithm a production line, with an arbitrary number of machines each processing items at different rates and with buffers of any size,can be modelled efficiently.The algorithm is based on computing the time to the next event for each buffer and machine, where the events are: a buffer becomes full, a buffer becomes empty, a machine fails,and a machine is repaired. By collapsing the production line to exclude empty buffers that stay empty and full buffers that stay full, piece-by-piece computation is avoided. Computation time is reduced further by updating a buffer only when the input or output rate of that buffer changes or when the state of that buffer changes. The implementation of this model is compared to a piece-by-piece simulator.

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Section: Introductionmentioning

confidence: 90%

Event-driven model of unreliable production lines with storage

D'Angelo

Caramanis

Finger

et al. 1988

International Journal of Production Research

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“…Some organisations plan buffers or strategic stock [12] to insulate their operations against variation. This is common in bottling plants, where machines are decoupled, raising Overall Equipment Effectiveness (OEE) [13]. Accumulated inventory is often a result of not heeding the lean principle of pull [3], instead pushing currently-unsellable inventory into the system.…”

Section: Inventory Accumulationmentioning

confidence: 99%

Strategic Production Line Synchronisation

Fienberg

Hartmann

Hattingh

2016

SAJIE

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A study was conducted at the sole global producer of suspension struts for a particular vehicle manufacturer. This supplier is currently able to meet customer demand. However, it does so because of a large finished goods and work-in-progress (WIP) inventory. The plant operates two production processes that are separated by a large buffer of WIP, which essentially decouples the production processes. This study aimed to reduce this WIP buffer; this would require the processes to become synchronised, bearing in mind that the reliability of delivery should not decrease. A tool that considers time, quality, and machine capacity was developed to assess the impact of line synchronisation on company performance figures. It was found that line synchronisation produced several benefits for the supplier, including batch size reduction, lower inventory levels, and associated shorter lead times. This further allowed the supplier to improve flow in the plant by introducing a pull system. Improved visual oversight could lead to further improved problem-solving and innovation. OPSOMMINGŉ Gevallestudie is by die alleenverskaffer van suspensiestutte vir ŉ spesifieke motorvervaardiger geloods. Die vervaardiger kan tans die vraag van die kliënt bevredig, maar dit is as gevolg van ŉ groot voorraad van voltooide goedere en werkstukke in proses. Die fabriek bedryf twee vervaardigingsprosesse wat met ŉ groot buffer van werkstukke in proses geskei word. Dit ontkoppel effektief die produksieprosesse. Die doel van hierdie studie is om die werk-inproses buffer te verminder. Dit vereis dat die prosesse gesinkroniseer moet word sonder dat die betroubaarheid verminder word. ŉ Gereedskapstuk wat die tyd, gehalte en masjienkapasiteit in ag neem is ontwikkel om die impak van produksielyn sinkronisering op die maatskappy se vertoning te bepaal. Daar is gevind dat die produksielyn sinkronisering verskeie voordele vir die verskaffer inhou, onder andere vermindering van lotgrootte, laer voorraadvlakke en korter leitye. Dit het die verskaffer toegelaat om die vloei in die fabriek te verbeter deur ŉ trekstelsel bekend te stel. Verbeterde opsig kan lei tot verder verbeterde probleemoplossing en innovasie.

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“…evinced, there are downtimes of single machines longer than this period. Increasing the buffering times just by working with larger buffers would result in much higher costs for implementation and operation . Alternative ways to improve their buffering effect might be of interest.…”

Section: Introductionmentioning

confidence: 99%

“…Authors such as Filmer, Bernhard or Weiß used computer simulation approaches for analysis and prognosis of bottling and packaging plant efficiencies. Rädler and Voigt performed simulations focusing on the control of complete plants. They both aimed at stabilizing the filling levels of the conveyors by a superior control of all machine speeds.…”

Section: Introductionmentioning

confidence: 99%

Continuous Control for Buffering Conveyors in Beverage Bottling Plants

Sorgatz

Voigt

2012

Packag. Technol. Sci.

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In beverage bottling plants, buffering conveying systems are used to decouple the various machines. They avoid propagation of machine breakdowns along the plant by assimilating or releasing bottles or containers. Today, they are controlled in steps by mechanical jam switches. In many cases, they enable an enduring filling process, which is necessary to gain good product quality and high plant efficiency. But with longer faults, the filling process still has to stop or slow down. Additionally, today's conveyors run very noisy. This affects the operator's health and conflicts with legal regulations. This paper presents an alternative control approach for buffering conveyors. It was created to improve the buffering effect and to reduce the noise emissions of today's systems. Instead of using jam switches, it uses counting sensor systems to obtain stepless information on the bottles entering and leaving the buffering conveyor. On this basis, the first continuous control algorithm for buffering conveyors was developed. It was described mathematically for all possible buffer situations. It was programmed and implemented in an industrial scale pilot plant. Finally, experiments in comparison with the commonly used jam switch control were carried out for all relevant settings. The practical experiments showed a stable behaviour of the new control algorithm. It reacted appropriately to state changes. Readjustment times and an almost minimal dead time (shortest transportation time of bottles) proved a high buffering effect. Above all, the new control algorithm resulted in a clearly audible and measureable reduction of the noise level. Copyright © 2012 John Wiley & Sons, Ltd.

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Buffer stocks in automatic transfer lines

Cited by 24 publications

References 0 publications

Event-driven model of unreliable production lines with storage

Event-driven model of unreliable production lines with storage

Strategic Production Line Synchronisation

Continuous Control for Buffering Conveyors in Beverage Bottling Plants

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