Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: facilities design

Sortuj według:

Ogranicz wyniki do:

A new simulation-optimization approach for the circulation facilities design at urban rail transit station

Khattak A., Jiang Y., Zhu J., Hu L.

Archives of Transport

2017

Vol. 43, iss. 3

69--90

Width design of the urban rail transit stations circulation facilities is a vital issue. The existing width design approach failed in fully considering the essential factors such as fluctuation in passengers’ arrival process, fluctuation and state-dependence in passengers walking speed and the blocking when passengers’ demand exceeds the capacity of facilities. For this purpose, a PH-based simulation-optimization approach is proposed that fully considers the fluctuation, the state-dependence, Level of Service (LOS) and blocking effect. This novel approach provides automatic reconfiguration of the widths of circulation facilities by a concurrent implementation of a PH-based Discrete-Event Simulation (DES) model and the Genetic Algorithm (GA). The proposed PH-based simulation-optimization approach and the existing design approaches based on the exponential and deterministic models are applied to design the widths of circulation facilities. The results reveal that the circulation facilities designed by the proposed approach have larger widths. Similarly, increase in the SCV of arrival interval results in increasing the widths designed by the proposed approach increase while the widths of the other two approaches stay the same. The width designed of the proposed approach increase at faster rate than that of the other two approach when the passengers’ arrival rate increases.

Rational Searching Procedure in Warehouse Design

Kostrzewski M.

Logistics and Transport

2016

Vol. 31, No. 3

83--104

Designing a warehouse layout is an important problem, which plays a role in a life cycle of a company. Generally, two main types of layout decision problems are mentioned in literature. The first problem is usually called facility layout problem while the second one is internal layout designing problem or aisle configuration problem. Merging them both, the procedure for rational searching of optimal warehouse layout is prepared. It was decided to prepare the procedure as an optimisation procedure of functional and spatial areas. The procedure is a part of the logistics facilities designing method because a sketch layout of logistics facility is an important part of the method of logistic facilities designing. The paper briefly describes the location of the procedure in the method. Regarding functional and spatial layouts designing, model was expanded with mathematical formulas of certain geometrical parameters. Particular emphasis on warehouse geometry is important due to the fact that many other issues depend on these parameters in warehouse designing process. The paper consists of a problem definition, mathematical model formulation and precise descriptions adequate to mathematic notations. What is more, the example of procedure application implemented into the software is given. The software is the implementation of the procedure and the whole method itself.