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Wyszukujesz frazę "Dolgui, A." wg kryterium: Autor


Wyświetlanie 1-5 z 5
Tytuł:
A transfer line balancing problem by heuristic methods: industrial case studies
Autorzy:
Guschinskaya, O.
Dolgui, A.
Tematy:
computer-aided design
machining
line balancing
optimization
heuristics
Pokaż więcej
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:
https://bibliotekanauki.pl/articles/375913.pdf  Link otwiera się w nowym oknie
Opis:
The paper deals with the problem of optimal configuration of a type of transfer lines which are equipped with transfer machines. Such machines perform operations with standard modular spindle heads which are activated sequentially. All operations assigned to the same spindle head (block of operations) are executed simultaneously by a set of tools fixed at the spindle head. The quantity of machines and spindle heads used to produce a part with the given productivity rate defines the final cost of the transfer line which must be minimized. To minimize this cost, a combinatorial problem of operations assignment to blocks and machines must be solved. The solution must provide a desired productivity (cycle time), it must also satisfy precedence and compatibility constraints. In this paper, we suggest improved versions of FSIC heuristic algorithm in order to help line designers to solve real-scale industrial problems. Results of computational experiments obtained for industrial cases are presented.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exponential smoothing for multi-product lot-sizing with heijunka and varying demand
Autorzy:
Korytkowski, P.
Grimaud, F.
Dolgui, A.
Tematy:
job shop
multiproduct
varying demand
lot-sizing
heijunka
exponential smoothing
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Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/406946.pdf  Link otwiera się w nowym oknie
Opis:
Here we discuss a multi-product lot-sizing problem for a job shop controlled with a heijunka box. Demand is considered as a random variable with constant variation which must be absorbed somehow by the manufacturing system, either by increased inventory or by flexibility in the production. When a heijunka concept (production leveling) is used, fluctuations in customer orders are not transferred directly to the manufacturing system allowing for a smoother production and better production capacity utilization. The problem rather is to determine a tradeoff between the variability in the production line capacity requirement and the inventory level.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Key performance indicators for supply planning of multilevel serial systems with stochastic lead times
Autorzy:
Hnaien, F.
Dolgui, A.
Louly, M. A.
Tematy:
multilevel serial systems
random lead times
performance evaluation
newsboy model
generalizations
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Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Powiązania:
https://bibliotekanauki.pl/articles/971017.pdf  Link otwiera się w nowym oknie
Opis:
This paper examines a supply planning problem for multilevel serial production systems under lead time uncertainties. The techniques used in industry are often based on the assumption that the lead times are known. However, in a supply chain the lead times are often random variables. Therefore, it is necessary to evaluate the influence of the planned lead times on the total cost. An exact performance evaluation technique is developed to calculate the total cost as a function of the planned lead times when the actual lead times are random discrete variables. The sum of the average component holding and tardiness costs at each level, plus the average finished product backlogging cost is considered. Several properties of this function are proven. A numerical example is reported.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimizing modular machining line design problem with mixed activation mode of machining units
Autorzy:
Belmokhtar, S.
Dolgui, A.
Delorme, X.
Ignatenko, I.
Tematy:
modular machining line
cost optimization
mixed-integer programming
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Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:
https://bibliotekanauki.pl/articles/375904.pdf  Link otwiera się w nowym oknie
Opis:
A modular transfer line designing problem is investigated. The problem is to find the best subset of modules (machining units) from a given set and to assign them to different stations so that technological constraints and cycle upper limit are respected and the line cost is minimal. The investigated lines have a mixed activation mode for the machining units of each station, i. e. the units of each station are arranged into a series of stages such that each stage is composed of several units activated in parallel. A mixed integer program approach is proposed to model and solve the corresponding design problem. Improvements are suggested in order to reduce the model size and speed up the computations.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-objective approach for production line equipment selection
Autorzy:
Chehade, H.
Dolgui, A.
Dugardin, F.
Makdessian, L.
Yalaoui, F.
Tematy:
linia produkcyjna
projektowanie
optymalizacja
production line design
line balancing
equipment selection
multi-objective optimization
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/407262.pdf  Link otwiera się w nowym oknie
Opis:
A novel problem dealing with design of reconfigurable automated machining lines is considered. Such lines are composed of workstations disposed sequentially. Each workstation needs the most suitable equipment. Each available piece of equipment is characterized by its cost, can perform a set of operations and requires skills of a given level for its maintenance. A multiobjective approach is proposed to assign tasks, choose and allocate pieces of equipment to workstations taking into account all the problem parameters and constraints. The techniques developed are based on a genetic algorithm of type NSGA-II. The NSGA-II suggested is also combined with a local search. These two genetic algorithms (with and without local search) are tested for several line examples and for two versions of the considered problem: bi-objective and four-objective cases. The results of numerical tests are reported. What is the most interesting is that the assessment of these algorithms is accomplished by using three measuring criteria: the direct measures of gaps, the measures proposed by Zitzler and Thiele in 1999 and the distances suggested by Riise in 2002.
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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