Wyniki wyszukiwania - BazTech

1

The impact of the availability of resources, the allocation of buffers and number of workers on the effectiveness of an assembly manufacturing system

Kłos S., Trebuna P.

Management and Production Engineering Review

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2017

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Vol. 8, No. 3

40--49

EN

This paper proposes the application of computer simulation methods in order to analyse the availability of resources, buffers and the impact of the allocation of workers on the throughput and work-in-progress of a manufacturing system. The simulation model of the production system is based on an existing example of a manufacturing company in the automotive industry. The manufacturing system includes both machining and assembly operations. Simulation experiments were conducted vis-`a-vis the availability of the different manufacturing resources, the various allocations of buffer capacities and the number of employees. The production system consists of three manufacturing cells – each cell including two CNC machines – and two assembly stations. The parts produced by the manufacturing cells are stored in buffers and transferred to the assembly stations. Workers are allocated to the manufacturing cells and assembly stations, but the number of workers may be less than number of workplaces and are thus termed ‘multi-workstations’. Using computer simulation methods, the impact of the availability of resources, the number of employees and of the allocation of buffer capacity on the throughput and work-in-progress of the manufacturing system is analysed. The results of the research are used to improve the effectiveness of manufacturing systems using a decision support system and the proper control of resources. Literature analysis shows that the study of the impact of buffer capacities, availability of resources and the number of employees on assembly manufacturing system performance have not been carried out so far.

2

Improving manufacturing processes using simulation methods

Kłos S., Patalas-Maliszewska J., Trebuna P.

Applied Computer Science

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2016

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Vol. 12, no 4

7--17

EN

The paper presents the results of simulation research on buffer space allo-cated in a flow line and operation times influence on the throughput of a manufacturing system. The production line in the study consists of four stages and is based on a real machining manufacturing system of a small production enterprise. Using Tecnomatix Plant Simulation software, a simulation model of the system was created and set of experiments was planned. Simulation experiments were prepared for different capacities of intermediate buffers located between manufacturing resources and op-eration times as input parameters, and the throughput per hour and aver-age life span of products as the output.

3

Using computer simulation method to improve throughput of production systems by buffers and workers allocation

Kłos S., Trebuna P.

Management and Production Engineering Review

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2015

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Vol. 6, No. 4

60--69

EN

This paper proposes the application of computer simulation methods to support decision making regarding intermediate buffer allocations in a series-parallel production line. The simulation model of the production system is based on a real example of a manufacturing company working in the automotive industry. Simulation experiments were conducted for different allocations of buffer capacities and different numbers of employees. The production system consists of three technological operations with intermediate buffers between each operation. The technological operations are carried out using machines and every machine can be operated by one worker. Multi-work in the production system is available (one operator operates several machines). On the basis of the simulation experiments, the relationship between system throughput, buffer allocation and the number of employees is analyzed. Increasing the buffer capacity results in an increase in the average product lifespan. Therefore, in the article a new index is proposed that includes the throughput of the manufacturing system and product life span. Simulation experiments were performed for different configurations of technological operations.

4

Optimal buffer allocation in re-entrant job shop production using simulated annealing

Korytkowski P., Wisniewski T., Zaikin O.

Management and Production Engineering Review

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2010

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Vol. 1, No. 3

30-40

EN

A re-entrant job shop production is examined in the paper. An optimization model is constructed to achieve an optimal buffer allocation ensuring profit maximization. An algorithm based on simulated annealing approach is developed to solve the problem. A real industrial application in commercial offset printing is presented. Experimental results show that the proposed methodology is effective.

5

Algorytm priorytetowy alokacji buforów dla problemu harmonogramowania projektu ze zdefiniowanymi kamieniami milowymi

Klimek M., Łebkowski P.

Logistyka

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2010

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nr 2

PL

Artykuł prezentuje model harmonogramowania projektu z ograniczoną dostępnością zasobów (ang. RCPSP - Resource-Constrained Project Scheduling Problem) ze zdefiniowanymi terminami realizacji kamieni milowych projektu. Dla tego modelu proponowany jest priorytetowy algorytm alokacji buforów. Skuteczność opisanego algorytmu jest testowana przy użyciu zbioru instancji J30 i J90 z biblioteki PSPLIB (ang. Project Scheduling Problem LIBrary).

EN

This paper presents a model of the Resource-Constrained Project Scheduling Problem (RCPSP) with defined terms of milestones achievement. For this model is proposed priority algorithm of buffer allocation. Effectiveness of described algorithm is tested using a set of J30 and J90 problem instances from the Project Scheduling Problem LIBrary (PSPLIB).

6

Buffer allocation in surface mount technology lines with machine downtimes

Sawik T.

Automatyka / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

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2001

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T. 5, z. 1/2

493-500

EN

This paper provides the reader with a mixed integer programming formulation for optimization of buffer allocation in a Surface Mount Technology (SMT) line with prescheduled machine downtimes. An SMT line consists of several assembly stations in serias and/ or in parallel separated by finite intermediate buffers and conveyor systems that transfers Printed Wiring Boards Between the station. The line produces several different board types. Each board must be processing by at most on emachine in each stage. When a machine finishes to process a board and the downstream buffer is full the machine is blocked while if the upstream buffer is empty the machine is starved. Machine blocking and starvation occur because of the difference in processing times at the various processing stages or due to determine buffer allocation and capacity so as to minimize makespan for a mix of boards. Numerical example is presented to illustrate application of the proposed approach.

PL

W pracy rozważa się zagadnienie doboru pojemności buforów międzyoperacyjnych w elastycznych liniach montażu powierzchniowego kart elektronicznych. Elastyczna linia montażowa składa się z szeregowo połączonych stacji montażowych, rozdzielonych buforami między operacyjnymi o ograniczonych pojemnościach, zaś każda stacja obejmuje jedną lub kilka jednakowych maszyn pracujących równolegle. Linia przeznaczona jest do jednoczesnego montażu kilku lub kilkunastu typów wyrobów. Każdy wyrób po wykonaniu operacji montażu na danej stacji jest transportowany do stacji następnej lub bufora pomiędzy stacjami. Jeśli w buforze nie ma miejsca, wyrób pozostaje na dotychczasowej stacji i blokuje ją do momentu zwolnienia miejsca w buforze. W pracy przedstawiono nowy model programowania całkowitoliczbowego mieszanego do wyznaczenia minimalnych pojemności buforów, dla których można otrzymać najkrótszy harmonogram montażu zadanej partii wyrobów w przypadku wystąpienia planowanych przestojów maszyn. Zamieszczono przykład zastosowania opracowanego podejścia do optymalizacji pojemności buforów w linii montażu powierzchniowego kart elektronicznych.