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A survey on multi-floor facility layout problems
, Article Computers and Industrial Engineering ; Volume 107 , 2017 , Pages 158-170 ; 03608352 (ISSN) ; Pishvaee, M. S ; Akbari Jokar, M. R ; Sharif University of Technology
Abstract
Facility layout problem is a well-known optimization problem which generally deals with the arrangement of the facilities required in an organization. This problem has received much attention during the past decades. However, the researchers have mainly focused on the case where a single floor is available. While, in the competitive world, it is clear that using multi-floor structure layouts are much more efficient and in some cases necessary due to the nature of the functions and activities performed in the firms. Hence, this issue has recently attracted much attention and is becoming increasingly popular. Nevertheless, the lack of a review study on this subject for directing the new...
An optimal approach for maximizing the number of adjacencies in multi floor layout problem
, Article International Journal of Production Research ; Volume 53, Issue 11 , 2015 , Pages 3462-3474 ; 00207543 (ISSN) ; Ghassemi Tari, F ; Sharif University of Technology
Taylor and Francis Ltd
2015
Abstract
Multi-floor facility layout problem concerns the arrangement of departments on the different floors. In this paper, a new mathematical model is proposed for multi-floor layout with unequal department area. Maximising the number of useful adjacencies among departments is considered as the objective function. The adjacencies are divided into two major categories: horizontal and vertical adjacencies. The horizontal adjacency may be occurred between the departments assigned to same floors while the vertical can be happened between departments assigned to any consecutive floors. A minimum common boundary length (surface area) between any two horizontal (vertical) adjacent departments is...
Constructing an optimal facility layout to maximize adjacency as a function of common boundary length
, Article Engineering Optimization ; Volume 50, Issue 3 , 2018 , Pages 499-515 ; 0305215X (ISSN) ; Neghabi, H ; Sharif University of Technology
Taylor and Francis Ltd
2018
Abstract
An effective facility layout implies that departments with high flow are laid adjacent. However, in the case of a very narrow boundary length between the neighbouring departments, the adjacency would actually be useless. In traditional layout design methods, a score is generally assigned independent of the department’s boundary length. This may result in a layout design with a restricted material flow. This article proposes a new concept of adjacency in which the department pairs are laid adjacent with a wider path. To apply this concept, a shop with unequal rectangular departments is contemplated and a mathematical programming model with the objective of maximizing the sum of the adjacency...
Safety of Plant Layout by Risk Assessment
, M.Sc. Thesis Sharif University of Technology ; Rashtchian, Davood (Supervisor)
Abstract
One of the most important stages to designing a process plant is layout of equipment in unit area. There are plenty of routine procedures to find out equipment arrangement and their separation distances based on process and cost criteria. One of this Procedures is the use of codes and standards. Although some studies have been carried out to enter safety parameters to conventional procedures, the problem complexity because of the number of involved equipment is still of concern. To clear these ambiguities, the new approach presented in this thesis is aimed at quantifying the effects of adjacent equipment on each other. In this way, fire radiation and explosion have been selected as the major...
Constructing a block layout by face area
, Article International Journal of Advanced Manufacturing Technology ; Volume 54, Issue 5-8 , 2011 , Pages 801-809 ; 02683768 (ISSN) ; Sangchooli, A. S ; Sharif University of Technology
2011
Abstract
Solving the facility layout problems by graph theory consists of two stages. In the first stage, a planar graph that specifies desired adjacencies is obtained and in the second stage, a block layout is achieved from the planar graph. In this paper, we introduce face area as a new concept for constructing a block layout. Based on this idea, we present a new algorithm for constructing block layout from a maximal planar graph (MPG). This MPG must be generated from deltahedron heuristic. Constructed block layout by this algorithm satisfies all of adjacency and area requirements
A bi-objective MIP model for facility layout problem in uncertain environment
, Article International Journal of Advanced Manufacturing Technology ; Volume 81, Issue 9-12 , 2015 , Pages 1563-1575 ; 02683768 (ISSN) ; Eshghi, K ; Neghabi, H ; Sharif University of Technology
Abstract
Facility layout problem (FLP) is one of the classical and important problems in real-world problems in the field of industrial engineering where efficiency and effectiveness are very important factors. To have an effective and practical layout, the deterministic assumptions of data should be changed. In this study, it is assumed that we have dynamic and uncertain values for departments’ dimensions. Accordingly, each dimension changes in a predetermined interval. Due to this assumption, two new parameters are introduced which are called length and width deviation coefficients. According to these parameters, a definition for layout in uncertain environment is presented and a mixed integer...
A new linear adjacency approach for facility layout problem with unequal area departments
, Article Journal of Manufacturing Systems ; Volume 37, Part 1 , October , 2015 , Pages 93-103 ; 02786125 (ISSN) ; Neghabi, H ; Sharif University of Technology
Elsevier
2015
Abstract
In this study a new version of adjacency, which provides a more flexible layout design, is proposed. In the proposed version, departments which are nonadjacent yet close to each other are considered to be adjacent with a smaller adjacency rating. It is shown that the proposed adjacency is a generalized version of the traditional adjacency. A mathematical programming model is developed for the proposed facility layout problem. To show the flexibility and efficacy of the proposed model, a computational study is conducted. The solution of an illustrative example as well as the solutions of several test problems, reveal flexibility and efficacy of the proposed model
Investigation of heavy metals containing acidic waste waters from coal mine
, Article 2010 4th International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2010, 18 June 2010 through 20 June 2010 ; June , 2010 ; 9781424447138 (ISBN) ; Sharif University of Technology
2010
Abstract
Waste water from ore plant layout central Alborz's coal has been investigated and analyzed. Studies showed that because of acidic character, the waste water contains heavy metals including Cu, Cr, Ba, Zn, V, Sr, Pb, Ni. Considering the importance of this topic for outgoing acidic waste waters which is hazardous for the environment, i.e. heavy metals, the same should not be transferred into the environment. Since their waste water is transferred into nearby agricultural ground, it was developed a method, so that waste water is primarily directed into a slug pond for sedimentation. In the second stage in another pond, the outflow of waste water was treated with chemicals. Also the pH was...
A new concept of adjacency for concurrent consideration of economic and safety aspects in design of facility layout problems
, Article Journal of Loss Prevention in the Process Industries ; Volume 40 , 2016 , Pages 603-614 ; 09504230 (ISSN) ; Ghassemi Tari, F ; Sharif University of Technology
Elsevier Ltd
2016
Abstract
In this manuscript a new phenomenon of adjacency and closeness rating is proposed for constructing the optimal facility layout design. In the proposed approach, the closeness rating is applied to every pair of neighboring departments in a range of their attached point up to a predefined distance between them. Also, while in the traditional approach the closeness rating is applied for determining either the proximity or farness of two departments, the proposed approach considers both the degree of closeness as the economical purposes, and farness as the safety purposes concurrently. A mathematical model is proposed for constructing the optimal layout design. For evaluating the efficiency and...
An efficient tabu algorithm for the single row facility layout problem
, Article European Journal of Operational Research ; Volume 205, Issue 1 , 2010 , Pages 98-105 ; 03772217 (ISSN) ; Eshghi, K ; Sharif University of Technology
2010
Abstract
The general goal of the facility layout problem is to arrange a given number of facilities to minimize the total cost associated with the known or projected interactions between them. One of the special classes of the facility layout problem is the Single Row Facility Layout Problem (SRFLP), which consists of finding an optimal linear placement of rectangular facilities with varying dimensions on a straight line. This paper first presents and proves a theorem to find the optimal solution of a special case of SRFLP. The results obtained by this theorem prove to be very useful in reducing the computational efforts when a new algorithm based on tabu search for the SRFLP is proposed in this...
An ant colony system for enhanced loop-based aisle-network design
, Article European Journal of Operational Research ; Volume 207, Issue 1 , 2010 , Pages 110-120 ; 03772217 (ISSN) ; Kazemi, M ; Eshghi, K ; Lahmar, M ; Sharif University of Technology
Abstract
The purpose of this paper is to develop a global optimization model, simplification schemes, and a heuristic procedure for the design of a shortcut-enhanced unidirectional loop aisle-network with pick-up and drop-off stations. The objective is to minimize the total loaded and empty trip distances. This objective is the main determinant for the fleet size of the vehicles, which in turn is the driver of the total life-cycle cost of vehicle-based unit-load transport systems. The shortcut considerably reduces the length of the trips while maintaining the simplicity of the system. The global model solves simultaneously for the loop design, stations' locations and shortcut design. We then develop...
An efficient multiple-stage mathematical programming method for advanced single and multi-floor facility layout problems
, Article Applied Mathematical Modelling ; Volume 40, Issue 9-10 , 2016 , Pages 5605-5620 ; 0307904X (ISSN) ; Akbari Jokar, M. R ; Sharif University of Technology
Elsevier Inc
2016
Abstract
Single floor facility layout problem (FLP) is related to finding the arrangement of a given number of departments within a facility; while in multi-floor FLP, the departments should be imbedded in some floors inside the facility. The significant influence of layout design on the effectiveness of any organization has turned FLP into an important issue. This paper presents a three- (two-) stage mathematical programming method to find competitive solutions for multi- (single-) floor problems. At the first stage, the departments are assigned to the floors through a mixed integer programming model (the single floor version does not require this stage). At the second stage, a nonlinear programming...
An efficient tabu algorithm for solving the single row facility layoutproblem
, Article 2009 International Conference on Computers and Industrial Engineering, CIE 2009, 6 July 2009 through 9 July 2009, Troyes ; 2009 , Pages 482-488 ; 9781424441365 (ISBN) ; Eshghi, K ; Sharif University of Technology
Abstract
Single-Row Facility Layout Problem (SRFLP) is a http://library.sharif.ir/web-manage/catalog/resource.do?method=edit&flowLastAction=view&id=447751special class of facilitylayout problems, consists of finding an optimal linear placement of rectangularfacilities with varying dimensions on a straight line. In this research, wefirst present a theorem to find the optimal solution of a special case of SRFLP.The results obtained by this theorem are very useful in reducing thecomputational efforts when, later on, a new algorithm based on tabu search ispresented for SRFLP. Computational results of the proposed algorithm onbenchmark problems show the efficiency of the algorithm compared to the...
Loop-based facility layout design under flexible bay structures
, Article International Journal of Production Economics ; Volume 193 , 2017 , Pages 713-725 ; 09255273 (ISSN) ; Jahandideh, H ; Modarres, M ; Sharif University of Technology
Abstract
We develop heuristic procedures for concurrent design of block layout, material flow network, and input and output stations. Unlike the common practice in the flexible bay structure layout design, our objective function includes both loaded and empty flow between pairs of I/O stations. This measure of effectiveness is the main determinant of the fleet size of the vehicles, which in turn is the major driver of the total investment and operational costs in vehicle-based material handling. Our work is the first to design flexible bay structure layouts for loop-based material flow patterns. We first develop heuristic algorithms to configure the layout on the foundations of a unidirectional loop...
Cellular layout design using Tabu search, a case study
, Article RAIRO - Operations Research ; Volume 53, Issue 5 , 2019 , Pages 1475-1488 ; 03990559 (ISSN) ; Ahadi, K ; Sharif University of Technology
EDP Sciences
2019
Abstract
This paper presents a facility layout design for a cellular manufacturing system (CMS), with the automated guided vehicles (AGVs) as the transportation device, to minimize the total material handling costs. A new concept of assigning the workstations to the non-overlapping closed zones, by which independent AGVs are allocated for internal transfer of materials/parts in each zone, is proposed. To handle this problem, a mathematical programming model is developed. The problem has been shown to be NP-hard. This computational difficulty has led us to consider suboptimal solutions generated by a Tabu search with three algorithmic variants. To evaluate the efficiencies of these algorithms, an...
Robust facility layout design for flexible manufacturing: a doe-based heuristic
, Article International Journal of Production Research ; Volume 60, Issue 18 , 2022 , Pages 5633-5654 ; 00207543 (ISSN) ; Salimpour, S ; Akhavan Niaki, S. T ; Azab, A ; Sharif University of Technology
Taylor and Francis Ltd
2022
Abstract
Flexible manufacturing systems (FMS) should be able to respond to changing manufacturing requirements and environments. From the layout point of view, FMS need to be rearranged to fit the new requirements. However, rearranging the layout is often undesirable due to its unpredicted high costs and production disruption. This paper proposes a practical approach to mitigate the effects and repercussions of changing environments and avoid rearranging the layout. A robust layout approach is presented, where changes in product demand and mix are absorbed by altering product routes and not rearranging the layout. In this approach, the problem is decomposed into two sub-problems: sub-problem 1 (SP1)...