Performance evaluation of shuttle-based storage and retrieval systems using discrete-time queueing network models

Performance evaluation of shuttle-based storage and retrieval systems using discrete-time queueing network models
Author: Epp,Martin
Publisher: KIT Scientific Publishing
Total Pages: 246
Release: 2018-02-14
Genre: Logistics
ISBN: 3731507420

Shuttle-based storage and retrieval systems (SBS/RSs) are an important part of today's warehouses. In this work, a new approach is developed that can be applied to model different configurations of SBS/RSs. The approach is based on the modeling of SBS/RSs as discrete-time open queueing networks and yields the complete probability distributions of the performance measures.

Performance Evaluation of Shuttle-based Storage and Retrieval Systems Using Discrete-time Queueing Network Models

Performance Evaluation of Shuttle-based Storage and Retrieval Systems Using Discrete-time Queueing Network Models
Author: Martin Epp
Publisher:
Total Pages: 242
Release: 2020-10-09
Genre: Business & Economics
ISBN: 9781013278983

Shuttle-based storage and retrieval systems (SBS/RSs) are an important part of today's warehouses. In this work, a new approach is developed that can be applied to model different configurations of SBS/RSs. The approach is based on the modeling of SBS/RSs as discrete-time open queueing networks and yields the complete probability distributions of the performance measures. This work was published by Saint Philip Street Press pursuant to a Creative Commons license permitting commercial use. All rights not granted by the work's license are retained by the author or authors.

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

Travel Time Models and Throughput Analysis of Dual Load Handling Automated Storage and Retrieval Systems in Double Deep Storage
Author: Doerr, Katharina
Publisher: KIT Scientific Publishing
Total Pages: 294
Release: 2018-08-16
Genre: Technology (General)
ISBN: 3731507935

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.

Modeling, Analysis, and Design Insights for Shuttle-Based Compact Storage Systems

Modeling, Analysis, and Design Insights for Shuttle-Based Compact Storage Systems
Author: Elena Tappia
Publisher:
Total Pages: 0
Release: 2015
Genre:
ISBN:

Shuttle-based compact systems are new automated multi-deep unit-load storage systems with lifts that promise both low operational cost and large volume flexibility. In this paper, we develop novel queuing network models to estimate the performance of both single-tier and multi-tier shuttle-based compact systems. Each tier is modeled as a multi-class semiopen queuing network, whereas the vertical transfer is modeled using an open queue. For a multi-tier system, the models corresponding to tiers and vertical transfer are linked together using the first and second moment information of the queue departure processes. The models can handle both specialized and generic shuttles, and both continuous and discrete lifts. The accuracy of the models is validated through both simulation and a real case. Errors are acceptable for conceptualizing initial designs. Numerical studies provide new design insights. Results show that the best way to minimize expected throughput time in single-tier systems is to have a depth/width ratio around 1.25. Moreover, specialized shuttles are recommended for multi-tier systems because the higher cost of generic shuttles is not balanced by savings in reduced throughput time and equipment needs.

A Multi-Tier Linking Approach to Analyze Performance of Vehicle-Based Warehouse Systems

A Multi-Tier Linking Approach to Analyze Performance of Vehicle-Based Warehouse Systems
Author: Debjit Roy
Publisher:
Total Pages: 0
Release: 2016
Genre:
ISBN:

To improve operational flexibility, throughput capacity, and responsiveness in order fulfillment operations, several distribution centers are implementing autonomous vehicle-based storage and retrieval (AVS/R) system in their high-density storage areas. In such systems, vehicles are self-powered to travel in horizontal directions (x- and y-axes), and use lifts or conveyors for vertical motion (z-axis). In this research, we propose a multi-tier queuing modeling framework for the performance analysis of such vehicle-based warehouse systems. We develop an embedded Markov chain based analysis approach to estimate the first and second moment of inter-departure times from the load-dependent station within a semi-open queuing network. The linking solution approach uses traffic process approximations to analyze the performance of sub-models corresponding to individual tiers (semi-open queues) and the vertical transfer units (open queues). These sub-models are linked to form an integrated queuing network model, which is solved using an iterative algorithm. Performance estimates such as expected transaction cycle times and resource (vehicle and vertical transfer unit) utilization are determined using this algorithm, and can be used to evaluate a variety of design configurations during the conceptualization phase.

Index to IEEE Publications

Index to IEEE Publications
Author: Institute of Electrical and Electronics Engineers
Publisher:
Total Pages: 746
Release: 1981
Genre: Electric engineering
ISBN:

Issues for 1973- cover the entire IEEE technical literature.

Simulation Modeling and Analysis with ARENA

Simulation Modeling and Analysis with ARENA
Author: Tayfur Altiok
Publisher: Elsevier
Total Pages: 462
Release: 2010-07-26
Genre: Technology & Engineering
ISBN: 0080548954

Simulation Modeling and Analysis with Arena is a highly readable textbook which treats the essentials of the Monte Carlo discrete-event simulation methodology, and does so in the context of a popular Arena simulation environment. It treats simulation modeling as an in-vitro laboratory that facilitates the understanding of complex systems and experimentation with what-if scenarios in order to estimate their performance metrics. The book contains chapters on the simulation modeling methodology and the underpinnings of discrete-event systems, as well as the relevant underlying probability, statistics, stochastic processes, input analysis, model validation and output analysis. All simulation-related concepts are illustrated in numerous Arena examples, encompassing production lines, manufacturing and inventory systems, transportation systems, and computer information systems in networked settings. Introduces the concept of discrete event Monte Carlo simulation, the most commonly used methodology for modeling and analysis of complex systems Covers essential workings of the popular animated simulation language, ARENA, including set-up, design parameters, input data, and output analysis, along with a wide variety of sample model applications from production lines to transportation systems Reviews elements of statistics, probability, and stochastic processes relevant to simulation modeling

Simulation Modeling and Analysis with Expertfit Software

Simulation Modeling and Analysis with Expertfit Software
Author: Averill Law
Publisher: McGraw-Hill Science/Engineering/Math
Total Pages: 792
Release: 2006-07-21
Genre: Technology & Engineering
ISBN: 9780073294414

Since the publication of the first edition in 1982, the goal of Simulation Modeling and Analysis has always been to provide a comprehensive, state-of-the-art, and technically correct treatment of all important aspects of a simulation study. The book strives to make this material understandable by the use of intuition and numerous figures, examples, and problems. It is equally well suited for use in university courses, simulation practice, and self study. The book is widely regarded as the “bible” of simulation and now has more than 100,000 copies in print. The book can serve as the primary text for a variety of courses; for example: • A first course in simulation at the junior, senior, or beginning-graduate-student level in engineering, manufacturing, business, or computer science (Chaps. 1 through 4, and parts of Chaps. 5 through 9). At the end of such a course, the students will be prepared to carry out complete and effective simulation studies, and to take advanced simulation courses. • A second course in simulation for graduate students in any of the above disciplines (most of Chaps. 5 through 12). After completing this course, the student should be familiar with the more advanced methodological issues involved in a simulation study, and should be prepared to understand and conduct simulation research. • An introduction to simulation as part of a general course in operations research or management science (part of Chaps. 1, 3, 5, 6, and 9).