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Modeling and Analysis of Automated Storage and Retrieval System with Multiple In-the-aisle Pick Positions

2015
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Release : 2015
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Book Synopsis Modeling and Analysis of Automated Storage and Retrieval System with Multiple In-the-aisle Pick Positions by : Faraz Ramtin

Download or read book Modeling and Analysis of Automated Storage and Retrieval System with Multiple In-the-aisle Pick Positions written by Faraz Ramtin. This book was released on 2015. Available in PDF, EPUB and Kindle. Book excerpt: As the third and final contribution, we study the impact of dedicated and class-based storage policy on the performance of MIAPP-AS/RS. We develop mathematical optimization models to minimize the travel time of the crane by changing the assignment of the SKUs to pick positions and storage locations simultaneously. We develop a more tractable solution approach by applying a Benders decomposition approach, as well as an accelerated procedure for the Benders algorithm. We observe high degeneracy for the optimal solution when we use chebyshev metric to calculate the distances. As the result of this degeneracy, we realize that the assignment of SKUs to pick positions does not impact the optimal solution. We also develop closed-form travel time models for MIAPP-AS/RS under a class-based storage policy.

Probabilistic Models for Order-picking Operations with Multiple In-the-aisle Pick Positions

2019 Order picking systems
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Release : 2019
Genre : Order picking systems
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Book Synopsis Probabilistic Models for Order-picking Operations with Multiple In-the-aisle Pick Positions by : Jingming Liu

Download or read book Probabilistic Models for Order-picking Operations with Multiple In-the-aisle Pick Positions written by Jingming Liu. This book was released on 2019. Available in PDF, EPUB and Kindle. Book excerpt: The development of probability density functions (pdfs) for travel time of a narrow aisle lift truck (NALT) and an automated storage and retrieval (AS/R) machine is the focus of the dissertation. The multiple in-the-aisle pick positions (MIAPP) order picking system can be modeled as an M/G/1 queueing problem in which storage and retrieval requests are the customers and the vehicle (NALT or AS/R machine) is the server. Service time is the sum of travel time and the deterministic time to pick up and deposit a pallet (TPD). Our first contribution is the development of travel time pdfs for retrieval operations in an MIAPP order picking system supported by a narrow aisle lift truck (MIAPP-NALT); storage operations are assumed to occur when order picking is not being performed. A rectilinear travel metric is used for the NALT; pdfs are derived and finite population queueing and infinite population queueing models are used to analyze the retrieval operations under stochastic conditions. Our second contribution is the development of travel time pdfs for retrieval operations in an MIAPP order picking system supported by an AS/R machine (MIAPP-AS/RS); storage operations are assumed to occur when order picking is not being performed. A Chebyshev travel metric is used for the AS/R machine. For the MIAPP-AS/RS operation, pick positions are located at floor level and on a mezzanine. The pdfs for four scenarios are derived and finite population and infinite population queueing models are used to analyze the retrieval operation under stochastic conditions. Our final contribution is the development of travel time pdfs for storage and retrieval operations in an MIAPP-NALT system with two classes of stock keeping units (skus): fast movers and slow movers. A rectilinear travel metric is used and two levels of pick positions are considered. Non-preemptive priority queueing and non-priority queueing models are used to analyze storage and retrieval requests in the MIAPP-NALT system. Retrieval requests are given a higher priority than storage requests; alternately, storage and retrieval requests are served using a first come, first serve (FCFS) discipline.

Travel Time Models and Throughput Analysis of Dual Load Handling Automated Storage and Retrieval Systems in Double Deep Storage

2018-08-16 Technology (General)
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Release : 2018-08-16
Genre : Technology (General)
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Book Rating : 935/5 ( reviews)

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Book Synopsis Travel Time Models and Throughput Analysis of Dual Load Handling Automated Storage and Retrieval Systems in Double Deep Storage by : Doerr, Katharina

Download or read book Travel Time Models and Throughput Analysis of Dual Load Handling Automated Storage and Retrieval Systems in Double Deep Storage written by Doerr, Katharina. This book was released on 2018-08-16. Available in PDF, EPUB and Kindle. Book excerpt: A general analytical travel time model for the quadruple command cycle in double deep storage systems with a dual capacity load handling device is formulated and validated by means of a simulation model. Various routing and sequencing strategies are composed. A simulation model is used to compare strategies for differnt AS/RS configurations and settings to assess them in consideration of real-world cases. For selected strategies, analytical formulations are derived.

Material Handling ’90

2012-12-06 Technology & Engineering
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Release : 2012-12-06
Genre : Technology & Engineering
Kind : eBook
Book Rating : 565/5 ( reviews)

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Book Synopsis Material Handling ’90 by : Robert J. Graves

Download or read book Material Handling ’90 written by Robert J. Graves. This book was released on 2012-12-06. Available in PDF, EPUB and Kindle. Book excerpt: The contents of this book are based on invited papers submittedfor presentation and discussion at the 1990 Material Handling Research Colloquium held in Hebron, Kentucky, June 19-21,1990. The Colloquium was sponsored and organized by the College Industry Councilfor Material Handling Education (CIC-MHE) with addi tional co-sponsorship and funding provided by numerous organizations (see ac knowledgements). The purpose of the Colloquium was to foster open discussion about the current state of material handling research at universitiesfrom across the United States and Canada. It was an opportunity to share specific research directions and accomplishments. But more importantly, it was an opportunity to discuss the implications of the basic constraints to solving industry relevant problems in the field of material handling and closely related activities; the efficacy of the approaches being taken at the present time; and the directions believed to be of most value to the industry and to advancing the knowledge and science base of the material handling engineering discipline. The sponsoring organization, the College Industry Council for Material Handling Education was founded in 1952. The council is composed of college and university educators, material handling equipment manufacturers, distributors, users and consultants, representatives of the business press plus professional staff and members of other organizations concerned with material handling education.

A Simulation Modeling Framework of Multiple-aisles Automated Storage and Retrieval Systems

2010 Combinatorial optimization
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Release : 2010
Genre : Combinatorial optimization
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Book Synopsis A Simulation Modeling Framework of Multiple-aisles Automated Storage and Retrieval Systems by : Jean-Philippe Gagliardi

Download or read book A Simulation Modeling Framework of Multiple-aisles Automated Storage and Retrieval Systems written by Jean-Philippe Gagliardi. This book was released on 2010. Available in PDF, EPUB and Kindle. Book excerpt:

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