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Articles 91 - 120 of 225
Full-Text Articles in Operations Research, Systems Engineering and Industrial Engineering
Energy And Cycle Time Efficient Warehouse Design For Autonomous Vehicle-Based Storage And Retrieval System, Banu Yetkin Ekren, Tone Lerher
Energy And Cycle Time Efficient Warehouse Design For Autonomous Vehicle-Based Storage And Retrieval System, Banu Yetkin Ekren, Tone Lerher
14th IMHRC Proceedings (Karlsruhe, Germany – 2016)
This study explores the best warehouse design for an autonomous vehicle based storage and retrieval system (AVS/RS) minimizing average energy consumption per transaction and average cycle time per transaction, simultaneously. In the design concept, we consider, rack design in terms of number of bays, number of tiers, number of aisles; number of resources, namely number of autonomous vehicles and lifts and; velocity profiles of lifts and autonomous vehicles in the AVS/RS. We completed 1,296 number of experiments in simulation to obtain Pareto solutions representing the “average energy consumption per transaction” and “average cycle time per transaction” trade-offs based on designs …
Determination Of Cycle Times For Double Deep Storage Systems Using A Dual Capacity Handling Device, Katharina Dorr
Determination Of Cycle Times For Double Deep Storage Systems Using A Dual Capacity Handling Device, Katharina Dorr
14th IMHRC Proceedings (Karlsruhe, Germany – 2016)
Double deep storage is an efficient method to improve space utilization in warehouses. Contrary to intuition, it also can be efficient when considering retrieval times, since the aisles of a warehouse with double deep storage may be shorter than comparable warehouses with single deep storage. AS/RS-machines equipped with two load-handling units might further improve the situation, since two storage units (for instance pallets or cases) can be stored and retrieved, effectively allowing quadruple command cycles, bringing in total two storage units into the aisle and retrieving two storage units at the same time. In this paper, we present a method …
A Simulation Model To Evaluate The Layout For Block Stacking Warehouses, Shahab Derhami, Jeffrey S. Smith, Kevin R. Gue
A Simulation Model To Evaluate The Layout For Block Stacking Warehouses, Shahab Derhami, Jeffrey S. Smith, Kevin R. Gue
14th IMHRC Proceedings (Karlsruhe, Germany – 2016)
Storing pallets of Stock Keeping Units (SKU's) on top of another in lanes on a warehouse floor is known as block stacking. This storage system is widely used in manufactoring systems and distribution centers. The arrangement of lanes in the layout of this system significantly impacts utilization of the storage space and transportation costs. Existing research that studies the layout for this system focuses exclusively on determining the optimal lane depth with respect to space utilization and ignores transportation costs. In this study, we develop a stimulation model that computes several performance metrics to evaluate both of these objectives for …
A Novel Approach To Analyze Inventory Allocation Decisions In Robotic Mobile Fulfillment Systems, Tim Lamballais, Debjit Roy, M.B.M De Koster
A Novel Approach To Analyze Inventory Allocation Decisions In Robotic Mobile Fulfillment Systems, Tim Lamballais, Debjit Roy, M.B.M De Koster
14th IMHRC Proceedings (Karlsruhe, Germany – 2016)
The Robotic Mobile Fulfillment System is a newly developed automated, parts-to-picker material handling system. Storage shelves, also known as inventory pods, are moved by robots between the storage area and the workstations, which means that they can be continually repositioned during operations. This paper develops a queueing model for optimizing three key decision variables: (1) the number of pods per product (2) the ratio of the number of pick to the number of replenishment stations, and (3) the replenishment level per pod. We show that too few or too many pods per product leads to unnecessarily long order throughput times, …
Simulation-Based Energy And Cycle Time Analysis Of Shuttle-Based Storage And Retrieval System, Tone Lerher, Banu Yetkin Ekren, Anil Akpunar
Simulation-Based Energy And Cycle Time Analysis Of Shuttle-Based Storage And Retrieval System, Tone Lerher, Banu Yetkin Ekren, Anil Akpunar
14th IMHRC Proceedings (Karlsruhe, Germany – 2016)
This study explores the best warehouse design for shuttle-based storage and retrieval system (SBS/RS) minimizing average energy consumption per transaction and average cycle time per transaction, simultaneously. For that we provided average energy consumption per transaction versus average cycle time per transaction graphs, for different design scenarios of the studied SBS/RS warehouse. In the design concept, we considered, rack design in terms of number of bays, number of tiers, number of aisles, as well as velocity profiles of lifts in the system. We completed 144 number of experiments by simulation to see the trade-offs based on the design scenarios and …
Non-Traditional Aisle Design For A Manufacturing Facility Layout, Dale T. Masel, Dean Marinchek
Non-Traditional Aisle Design For A Manufacturing Facility Layout, Dale T. Masel, Dean Marinchek
14th IMHRC Proceedings (Karlsruhe, Germany – 2016)
Methods for designing a facility layout typically assume that the aisles for interdepartmental travel will be parallel to the exterior walls of the facility. However, by putting aisles at an angle to the exterior walls, more direct routes between departments can be created, reducing travel distance. This paper describes a method to create a facility layout that does not have orthogonal aisles and testing of the resulting layouts shows that travel distance is reduced.
Operational-Level Optimization Of Inbound Intralogistics, Hector J. Carlo, Yeiram Martinez
Operational-Level Optimization Of Inbound Intralogistics, Hector J. Carlo, Yeiram Martinez
14th IMHRC Proceedings (Karlsruhe, Germany – 2016)
This study is concerned with optimizing inbound operations at distribution centers (DCs), warehouses, and cross-docks with staging areas. The objective of the problem is to minimize the makespan required to move all unit loads from the trailers to the flow racks, and from the flow racks to their respective storage locations. It is assumed that a set of inbound trailers with known composition have been assigned and sequenced to inbound dock doors. The following three inbound logistics decisions are simultaneously considered: i) unloaders’ assignment and scheduling, ii) loads-to-flow rack assignment, and iii) assignment and haulers’ scheduling. In this study we …
Understanding Worker Blocking And The Design Process, Russell D. Meller, Lisa M. Thomas
Understanding Worker Blocking And The Design Process, Russell D. Meller, Lisa M. Thomas
14th IMHRC Proceedings (Karlsruhe, Germany – 2016)
Designing a distribution center (DC) is a complex process that consists of answering dozens of interrelated questions. From our perspective, the penultimate question is one of which picking methodology is optimal. To answer this question requires a full evaluation of picking methodologies in terms of their ability to meet the expected throughput requirements of the system. In manual picking systems, as throughput requirements increase, worker interaction and blocking increase as well. This implies that being able to estimate the amount of worker blocking in a system is critical to a design effort. Most of the prior research in this area …
Introducing The Concept Of Hyperconnected Mobile Production, Suzanne Marcotte, Benoit Montreuil
Introducing The Concept Of Hyperconnected Mobile Production, Suzanne Marcotte, Benoit Montreuil
14th IMHRC Proceedings (Karlsruhe, Germany – 2016)
Many globalized businesses are trying to cope with growing competition by strategically expanding their dedicated network of production facilities so as to be able to offer and to deliver time and price competitive offers to their clients across the world. In this paper, exploiting Physical Internet principles, we introduce the concept of hyperconnected mobile production that can alternatively enable businesses to dynamically expand and contract as necessary their production capacity in regions worldwide. First, hyperconnected mobile production exploits open fabs from multiple parties readily available in those regions. Second, these fabs are to rely on plug-and-play production modules. These modules …
A High-Density, Puzzle-Based System For Rail-Rail Container Transfers, Kevin Gue
A High-Density, Puzzle-Based System For Rail-Rail Container Transfers, Kevin Gue
14th IMHRC Proceedings (Karlsruhe, Germany – 2016)
We describe a high-density, puzzle-based storage and transfer system for containers in a rail-to-rail hub for the Physical Internet. The system uses a new algorithm called GridHub, which is able to transfer items in all four cardinal directions simultaneously within a grid. We show how the GridHub system might be used in a rail-rail transfer hub to transfer containers between one side of the grid and a train.
Logistics Models To Support Order-Fulfillment From The Sea, Jennifer Pazour, Ian Shin
Logistics Models To Support Order-Fulfillment From The Sea, Jennifer Pazour, Ian Shin
14th IMHRC Proceedings (Karlsruhe, Germany – 2016)
Sea based logistics use maritime platforms to transfer cargo stored on vessels and delivers them ashore. This chapter describes the motivations and logistical requirements of seabasing. The sea base’s organizational structure, its material handling environment, and the internal cargo flow processes of the T-AKE vessel are described. Three seabasing distribution network scenarios -- Iron Mountain, Skin-to-Skin Replenishment, and Tailored Resupply Packages -- are described and mapped to warehousing and distribution networks, characteristics, and decision problems. Finally, related literature is reviewed and open areas for logistics research to support order fulfillment from the sea are identified.
Omnichannel Business-‐To-‐Consumer Logistics And Supply Chains: Towards Hyperconnected Networks And Facilities, Benoit Montreuil
Omnichannel Business-‐To-‐Consumer Logistics And Supply Chains: Towards Hyperconnected Networks And Facilities, Benoit Montreuil
14th IMHRC Proceedings (Karlsruhe, Germany – 2016)
This paper deals with omnichannel business-‐to-‐consumer logistics and supply chains. Its key contribution is the conceptualization of hyperconnected network and facility design options for enabling to meet the challenges toward achieving omnichannel logistics efficiently and sustainably while meeting the timely expectations of clients. These design options exploit key Physical Internet concepts. They encompass the transportation, pickup and delivery of ordered goods, the deployment of products across territories to enable fast response to orders, as well as on-‐demand production of products across networks of facilities while engaging multiple parties. The options range from current practice to prospective ones that are associated …
Maritime Location Decisions For Lng Bunkering Facilities, Reinier C. Schneider, Iris F.A. Vis
Maritime Location Decisions For Lng Bunkering Facilities, Reinier C. Schneider, Iris F.A. Vis
14th IMHRC Proceedings (Karlsruhe, Germany – 2016)
Liquefied natural gas (LNG) is one of the upcoming fuels to be used for more sustainable shipping activities in the maritime sector. For a widespread adoption by end-users, a refuelling network requiring capital intensive investments, needs to be in place. From a macro perspective of suppliers of LNG, it makes sense to develop the infrastructure at strategic locations that capture as many vessels and ships as possible. The goal of this research is to develop a facility location model that can contribute to the location selection of LNG facilities in a new fuelling network. The new model will fit the …
Methodology For Choosing An Appropriate Inland Vessels As A Floating Distribution Centers, Andrea Seidlova, David Sourek
Methodology For Choosing An Appropriate Inland Vessels As A Floating Distribution Centers, Andrea Seidlova, David Sourek
14th IMHRC Proceedings (Karlsruhe, Germany – 2016)
The primary goal of this paper is to propose a methodology for the choice of an appropriate vessel type under the specific condition of floating distribution center. The right choice of the appropriate type of vessel has a fundamental influence on the long-term success of city logistic projects with water transport. In this paper, we propose a methodology for vessel choice according to its inner layout and technology of handling. The possibility of an application in practice will be defined for each option.
Integrated Versus Sequential Scheduling And Assignment At A Unit Load Cross-Dock, Arpan Rijal, Marco Bijvank, Rene De Koster
Integrated Versus Sequential Scheduling And Assignment At A Unit Load Cross-Dock, Arpan Rijal, Marco Bijvank, Rene De Koster
14th IMHRC Proceedings (Karlsruhe, Germany – 2016)
Within a cross-dock, the assignment of trucks to dock-doors and the scheduling of trucks to be processed are two major operational decisions. Conventionally, assignment and scheduling decisions are made sequentially. However, solving the two problems sequentially can lead to sub-optimal solutions because the objectives of the two problems are in conflict with each other. To gain further insights, we create an integrated model which is capable of simultaneously scheduling and assigning trucks at cross-docks. We contrast the integrated model with a sequential model which first schedules trucks for processing and then assigns them to dock-doors. Experiments demonstrate that the integrated …
A Heuristic Approach To Storage System Design With Simultaneous Assignment Of Goods, Tobias Staab, Willibad A. Gunthner
A Heuristic Approach To Storage System Design With Simultaneous Assignment Of Goods, Tobias Staab, Willibad A. Gunthner
14th IMHRC Proceedings (Karlsruhe, Germany – 2016)
In the paper at hand, we analyze the planning of manually operated storage systems consisting of different storage areas. When solving design problems like dimensioning or equipment selection, the assignment of goods to storage areas has to be considered. Based on a general model to describe the geometry and performance calculation of a warehouse, we present a heuristic approach to assign goods to storage areas while simultaneously determining the design of the storage areas in a way that generates the lowest running costs. Our approach aims to support planners during the rough planning stage by providing a quick overview of …
Intermodal Hubs In The Physical Internet, Nadeepa Wickramage, Bill Ferrell
Intermodal Hubs In The Physical Internet, Nadeepa Wickramage, Bill Ferrell
14th IMHRC Proceedings (Karlsruhe, Germany – 2016)
Distribution of finished goods is currently an effective but inefficient process that consumes significant quantities of fossil fuel to move empty assets. This results in increased costs that are passed to the consumer and unnecessarily increased carbon emissions. The Physical Internet (PI) is focused on shared logistics that could prove to be an important element of next-generation logistics systems. The idea is to store and transport goods in anonymous standard-sized containers so that transportation and warehousing can be efficiently shared by many companies including competitors. If implemented, this idea has the potential of dramatically increasing efficiency thereby reducing fuel consumption …
Analyzing Order Throughput Times In A Milkrun Picking System, J. P. Van Der Gaast, M.B. M. De Koster, Ivo J.B.F. Adan
Analyzing Order Throughput Times In A Milkrun Picking System, J. P. Van Der Gaast, M.B. M. De Koster, Ivo J.B.F. Adan
14th IMHRC Proceedings (Karlsruhe, Germany – 2016)
E-commerce fulfillment competition evolves around cheap, speedy, and time-definite delivery. Milkrun order picking systems have proven to be very successful in providing handling speed for a large, but highly variable, number of orders. In this system, an order picker picks orders that arrive in real time during the picking process; by dynamically changing the stops on the picker’s current picking route. The advantage of milkrun picking is that it reduces order picking set-up time and worker travel time compared to conventional batch picking systems. This paper is the first in studying order throughput times of multi-line orders in a milkrun …
A Lagrangian Relaxation For Capacitated Single Allocation P-Hub Median Problem With Multiple Capacity Levels, Ching-Jung Ting, Kuo-Rui Lu
A Lagrangian Relaxation For Capacitated Single Allocation P-Hub Median Problem With Multiple Capacity Levels, Ching-Jung Ting, Kuo-Rui Lu
14th IMHRC Proceedings (Karlsruhe, Germany – 2016)
In this paper we consider a capacitated single allocation p-hub median problem with multiple capacity levels (CSApHMPMC) in which the decisions are to determine the location of p hubs and their capacity levels, the single allocation of non-hub nodes to hubs in the logistics network. This problem is formulated as an integer programming model with the objective of minimizing the sum of total transportation cost and fixed cost of the selected p hubs with established capacity levels. A Lagrangian relaxation (LR) approach is proposed to solve the CSApHMPMC. The Lagrangian function that we formulated decomposed the original problem into smaller …
Toward An Engineering Discipline Of Warehouse Design, Leon Mcginnis, Timothy Sprock
Toward An Engineering Discipline Of Warehouse Design, Leon Mcginnis, Timothy Sprock
14th IMHRC Proceedings (Karlsruhe, Germany – 2016)
Warehouses today are complex dynamic engineered systems, incorporating automation, mechanization, equipment, fixtures, computers, networks, products and people, and they can support the flow of tens or hundreds of thousands of different items to enable fulfilling thousands or tens of thousands of orders daily. In that sense, they represent a design challenge that is not terribly different from the design of other complex dynamic engineered systems, such as a modern passenger airplane, an automobile, or a unique building. What is different is that the design of these other complex dynamic engineered systems typically follows some engineering design discipline. Here, we argue …
Monte Carlo Algorithm To Study Performance Parameters Of Shuttle Systems, Wolfgang Trummer, Dirk Jodin
Monte Carlo Algorithm To Study Performance Parameters Of Shuttle Systems, Wolfgang Trummer, Dirk Jodin
14th IMHRC Proceedings (Karlsruhe, Germany – 2016)
Shuttle systems provide alternative solutions in storage technology. Ma-terial flow analyses of these systems are extensive due to complex interac-tion of several shuttles and lift elements. Besides classic cycle time calcu-lation, it also requires advanced analyzing methods. At the Institute of Logistics Engineering (ITL), Graz University of Technology, an innovative, software-based approach has been developed to investigate the performance of shuttle systems. This approach is based on the Monte Carlo method. The software tool takes into account a variety of different systems and operating parameters to reflect operative behavior of shuttle systems.
Color Removal From Pulp Mill Effluent Using Coal Ash Produced From Georgia Power Coal Combustion Plants, Christopher B. Willett
Color Removal From Pulp Mill Effluent Using Coal Ash Produced From Georgia Power Coal Combustion Plants, Christopher B. Willett
College of Graduate Studies: Theses & Dissertations
Two environmental concerns currently face Georgia: coal fly ash (CFA) waste from coal power plants, and the effluent generated by pulp mills. Pulp mill effluent discolors surface waters into which it is discharged, and has been proven to negatively impact the dissolved oxygen and carbon necessary for aquatic life. The proposed solution is a cost-effective adsorption treatment using an inexpensive but abundantly available waste material: CFA. CFA possesses beneficial properties that allow it to effectively remove contaminants, and is available at significantly reduced cost. The primary research objective was to define treatment parameters that would result in the maximum removal …
Positioning Automated Guided Vehicles In A General Guide-Path Layout, Abraham Mendoza, Jose A. Ventura
Positioning Automated Guided Vehicles In A General Guide-Path Layout, Abraham Mendoza, Jose A. Ventura
13th IMHRC Proceedings (Cincinnati, Ohio. USA – 2014)
The locations of dwell points for idle vehicles in an automated guided vehicle (AGV) system determine the response times for pick-up requests and thus affect the performance of automated manufacturing systems. In this study, we address the problem of optimally locating dwell points for multiple AGVs in general guide-path layouts with the objective of minimizing the maximum response time in the system. We propose a mixed integer linear programming (MILP) formulation for the problem. We also develop a generic genetic algorithm (GA) to find near optimal solutions. The MILP model and GA procedure are illustrated using a two-dimensional grid layout …
Integrating Analysis Into A Warehouse Design Workflow, Leon Mcginnis, Timothy Sprock
Integrating Analysis Into A Warehouse Design Workflow, Leon Mcginnis, Timothy Sprock
13th IMHRC Proceedings (Cincinnati, Ohio. USA – 2014)
Supply chain analyses, including those related to material handling systems, are typically purpose-built to answer specific questions and therefore have many different implementations depending on the question, the instance data, and the solver. The purpose-built nature of these models makes it difficult to integrate them into an iterative design workflow. Despite the myriad analysis implementations, the fundamental structure of these systems and their problem domain remains unchanged, suggesting that perhaps analyses could be automatically generated on demand, given an appropriate specification of the particular system to be analyzed. We apply model-based systems engineering (MBSE) methodologies to explore this possibility in …
Throughput Analysis Of S/R Shuttle Systems, Georg Kartnig, Jörg Oser
Throughput Analysis Of S/R Shuttle Systems, Georg Kartnig, Jörg Oser
13th IMHRC Proceedings (Cincinnati, Ohio. USA – 2014)
Shuttle systems are used in high performance automated storage/retrieval unit load systems. Each storage level is serviced by one transfer car travelling in dual command operation. One buffer slot is located at both ends of each level. This decouples horizontal travel from vertical input/output moves, which in this case requires two independent vertical reciprocating lifts at each end of the aisle. Other systems work with only one lift used in lower throughput applications. The content of this paper is treated in the following sections starting with a problem definition and a literature survey. This is followed by a detailed functional …
Variation In Lifting Behavior During A Highly Repetitive Manual Material Task, Steven A. Lavender
Variation In Lifting Behavior During A Highly Repetitive Manual Material Task, Steven A. Lavender
13th IMHRC Proceedings (Cincinnati, Ohio. USA – 2014)
Presenters will provide.
Clickstream Big Data And “Delivery Before Order Making” Mode For Online Retailers, Yeming Yale Gong, Haoxuan Xu
Clickstream Big Data And “Delivery Before Order Making” Mode For Online Retailers, Yeming Yale Gong, Haoxuan Xu
13th IMHRC Proceedings (Cincinnati, Ohio. USA – 2014)
Our research is inspired by a leading online retailer using clickstream big data to estimate customer demand and then ship items to customers or hubs near customers by a mode of “delivery before order making” (DBOM) mode. Using clickstream data to obtain advance demand information in order quantities, we integrate the forecasting with a singleitem uncapacitated dynamic lot sizing problem in a rolling-horizon environment. Using the simulated clickstream data, we evaluate the performance of DBOM mode.
Comparing Industry And Academic Perspectives On Cross-Docking Operations, Paul Buijs, Iris F.A. Vis
Comparing Industry And Academic Perspectives On Cross-Docking Operations, Paul Buijs, Iris F.A. Vis
13th IMHRC Proceedings (Cincinnati, Ohio. USA – 2014)
This paper performs a comparative analysis on the industry and academic perspectives on cross-docking operations. Detailed descriptions are provided for three typical cross-dock settings by means of case illustrations. The purpose of these descriptions is to inspire break-through innovations in future cross-docking research by identifying constraints, decision problems, and performance indicators that are thoroughly anchored in current practice.
Comparison Of Alternative Configurations For Dense Warehousing Systems, Kevin R. Gue, G. Don Taylor
Comparison Of Alternative Configurations For Dense Warehousing Systems, Kevin R. Gue, G. Don Taylor
13th IMHRC Proceedings (Cincinnati, Ohio. USA – 2014)
In heavily constrained environments requiring very high density storage, traditional aisle-based warehousing may not provide viable options. One feasible manifestation of high density storage systems is the ‘puzzle-based’ system, in which unit loads are moved through the system via manipulation of empty (escort) locations to retrieve desired items. Another option would be the use of movable concentric rings, with escorts being utilized to enable lateral movements of unit loads between the rings. In this paper, the authors present analytical results to compare retrieval time performance for these two types of high density storage systems for randomly demanded items under various …
Analysis Of Class-Based Storage Strategies For The Mobile Shelf-Based Order Pick System, Shobhit Nigam, Debjit Roy, Rene De Koster, Ivo J.B.F. Adan
Analysis Of Class-Based Storage Strategies For The Mobile Shelf-Based Order Pick System, Shobhit Nigam, Debjit Roy, Rene De Koster, Ivo J.B.F. Adan
13th IMHRC Proceedings (Cincinnati, Ohio. USA – 2014)
Mobile Shelf-based Order Pick (MSOP) systems are gaining significant in- terest for e-commerce fulfillment due to their rapid deployment capability and dynamic organization of storage pods based on item demand profiles. In this research, we model the MSOP system with class-based storage strategies and alternate pod storage policies using multi-class closed queuing networks. We observe that though closest-open location pod storage policy do not allow to efficiently use the storage spaces in comparison to random location pod storage policy in an aisle, it increases the system throughput for all item classes.