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Joint optimization of safety stock placement and supplier selection in a multi-layered distribution network

IFAC-PapersOnLine 2022年第10期55卷 2515-2520页

作者： Cheshmeh Chamani Casper Van Gheluwe El-Houssaine Aghezzaf Dept. of Industrial Systems Engineering and Product Design Ghent University Ghent Belgium Industrial Systems Engineering (ISyE) Flanders Make

This paper discusses the challenging problem of jointly optimizing safety stock placement and supplier selection in a multi-layered distribution network, under the guaranteed service model (GSM) approach and single-supplier strategy for the customers. The original GSM-based model is extended to include optimal echelon (R, Q) policies. We propose an approximation model, which determines the optimal configuration flow of orders, order quantities, reorder points, safety stock amounts, inbound and outbound service times at each node. A two-stage heuristic is developed for this complex model that optimizes the flow configuration and then determines the other variables. Current experimental results on a few test networks indicate a promising computational time performance.

关键词： Multi-echelon supply chain Safety stock placement Multi-layered distribution network Guaranteed-service model (R,Q) policy Suppliers Selection

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Robust co-design of robots via cascaded optimisation

Robust co-design of robots via cascaded optimisation

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IEEE International Conference on Robotics and Automation (ICRA)

作者： Akhil Sathuluri Anand Vazhapilli Sureshbabu Markus Zimmermann Robot Systems group Laboratory for Product Development and Lightweight Design TUM School of Engineering and Design Technical University of Munich (TUM) Germany

Optimising mechanical, control and actuator design variables together as a co-design problem enables identifying novel and better-performing robot architectures. Typically, solving such problems using conventional optimisation methods yields a single, point-based solution. Deviating from the computed optima may be necessary to ensure physical feasibility, typically associated with a performance loss. In this work, we present a two-step cascaded optimisation approach to identify non-intuitive designs and recover the loss in performance by constructing a solution space. The solution space provides robustness in the form of permissible ranges of design variable values and enables the selection of a physically feasible design. In our study, we observe (1) up to 20% of the lost performance is recovered and (2) an improvement of 30 % on the task metric in comparison to an existing robot and (3) designs with cost savings of up to 10% can be identified.

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Tactical planning of a reconfigurable cellular assembly system: A case study 57

Tactical planning of a reconfigurable cellular assembly syst...

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18th IFAC Workshop on Time Delay systems, TDS 2024

作者： Uzunosmanoglu, Mehmet Limère, Veronique Raa, Birger Lopez, Angel J. Gautama, Sidharta Cottyn, Johannes Huysentruyt, Stijn Lamote, Jan Dept. of Industrial Systems Engineering and Product Design Ghent University Belgium Dept. of Business Informatics and Operations Management Ghent University Belgium FlandersMake at UGent - Core Lab ISyE Belgium FlandersMake at UGent - Core Lab CVAMO Belgium ProductionS Flanders Make Belgium

In today's dynamic market, manufacturers are challenged with fluctuating demand and evolving product functionality requirements. Reconfigurable Manufacturing systems combine the efficiency of Dedicated Manufacturing systems with the flexibility of Flexible Manufacturing systems to cope with market trends cost-effectively. This paper investigates a tactical planning problem within InfraFlex, a reconfigurable cellular assembly system. InfraFlex features cells housing robotic arms, equipped with various tools and add-ons. The tactical planning problem involves optimizing resource allocation, system reconfiguration, and part routing decisions to minimize total costs. Using Integer Programming and the Gurobi solver, this study aims to quantify the value of reconfigurability under various scenarios. © 2024 The Authors.

关键词： Resource allocation

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3D reconstruction of skeletal mesh models and human foot biomodel generation using semantic parametric-based deformation

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International Journal of Computers and Applications 2020年第2期42卷 127-140页

作者： Agathos, Alexander Azariadis, Philip Department of Product & Systems Design Engineering University of the Aegean Ermoupolis Greece

This paper introduces two methodologies for the reconstruction of skeletal mesh models and for the generation of parametric bone models of the human foot. First, a new Parametric-Based Deformation methodology is presented, which deforms a template 3D mesh according to user-defined semantic parameters in order to derive a new bone model. The proposed method allows the parameterization of dense and detailed 3D meshes of human foot bones. An extensive evaluation is performed to examine the accuracy, quality, and performance of the proposed method with human and animal bones, and versus existing statistical-based methods in the literature. Also, a novel methodology is proposed for the generation of parametric bone models of the human foot using non-calibrated biplanar X-rays. The proposed method has been applied for the production of detail 3D foot biomodels from an initial template biomodel and has been evaluated using human and animal bones. © 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Semantics

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Computational design and Digital Fabrication 1

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International Conference on Recent Advances in Manufacturing, RAM 2020

作者： Kyratsis, Panagiotis Tzotzis, Anastasios Manavis, Athanasios Department of Product and Systems Design Engineering University of Western Macedonia Kila Kozani50100 Greece

ISBN: (数字)9789813344662

ISBN: (纸本)9789813344655

design engineers can benefit by learning to use the programming tools of CAD systems. It is possible to increase their productivity and implement their ideas effectively. Moreover, they can focus on the important product development stage instead of consuming time in routine tasks. In the light of these considerations, the current paper presents the possibilities that derive from the use of the programming resources that are available in different CAD systems, and especially the ones related to product design and fabrication. Two CAD-based applications were developed via such techniques, and the case studies found in this work prove their validity and usefulness. Well-known, commercially available CAD systems were used for these purposes, namely SolidWorks™ and Rhino™. The development of the applications was achieved via the CAD-based programming tools such as the application programming interface of SolidWorks™, by using Visual Basic for Applications programming language, and Python™, a textual programming language combined with Rhino™ 3D modeling tools. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Application programming interface CAD Computational design Digital fabrication

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Compatibility Assessment for Interfaces in Drivetrains of Robot-Like systems

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Procedia Computer Science 2024年 232卷 2994-3002页

作者： Marcus Volpert Birgit Vogel-Heuser Dominik Hujo Karsten Stahl Markus Zimmermann Institute of Automation and Information Systems TUM School of Engineering and Design Technical University of Munich Garching Germany Fellow IEEE Core Member of MDSI Member of MIRMI Institute of Machine Elements TUM School of Engineering and Design Technical University of Munich Garching Germany Laboratory for Product Development and Lightweight Design TUM School of Engineering and Design Technical University of Munich Garching Germany

Due to the complexity of robot-like systems (RLS), new developments are often avoided, and most variants of the systems are designed. The primary determinant of an RLS is its drivetrain, which comprises purchased components, namely the controller, motor driver, motor, and gearbox. Each of these purchased parts has different interfaces that are not standardized. If the interfaces are sufficiently complex, the compatibility of the parts can no longer be guaranteed manually. Therefore, this paper presents a draft ontology that verifies the compatibility of purchased parts in RLS drivetrains. Classes and properties are obtained from expert knowledge, norms, data standards, and data sheets to build an ontology. The ontology design is evaluated using an application example for a motor-gearbox interface.

关键词： robot-like systems interface modeling ontology model-based systems engineering drivetrains

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Guidance on a Digital Factory Twin: Proposal for a Reference Architecture

Guidance on a Digital Factory Twin: Proposal for a Reference...

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IEEE International Technology Management Conference

作者： Lick Jonas Kattenstroth Fiona Trienens Malte Disselkamp Jan-Philipp Kühn Arno Dumitrescu Roman Department for Digital Transformation Fraunhofer Institute for Mechatronic Systems Design Paderbor Germany Department for Digital Engineering Fraunhofer Institute for Mechatronic Systems Design Paderbor Germany Department for Systems Lifecycle Management Fraunhofer Institute for Mechatronic Systems Design Paderborn Germany Division for Product Development Fraunhofer Institute for Mechatronic Systems Design Paderborn Germany Professorship Advanced Systems Engineering University of Paderborn - Heinz Nixdorf Institute Paderborn Germany

ISBN: (数字)9798350367355

ISBN: (纸本)9798350367362

The digital twin in manufacturing, also called digital factory twin (DFT), is not only a recent technology but also a polymorphic concept which generates a profusion of state-of-the-art work from industry and research without real coherence. The work relates to very different realities including various definitions, shapes, models and applications. A wide variety of architectures are proposed and there is a significant lack of information on how to deploy a digital twin efficiently and how to define an appropriate architecture. The DFT is often implemented use-case-driven and in various ways concerning IT architectures. The paper proposes a reference architecture based on enterprise architecture modelling language ArchiMate and TOGAF principles, which allows to model business architectures and IT architectures. We make use of that and model a DFT business architecture based on the lifecycle of a factory and a DFT IT architecture based on IT applications and IT functions.

关键词： Industries Technology management Shape Discrete Fourier transforms production facilities Digital twins Manufacturing Virtual manufacturing Proposals Business

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Building an autonomous boat: a multidisciplinary design engineering approach

Building an autonomous boat: a multidisciplinary design engi...

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IEEE Metrology for Aerospace

作者： Alexandros Troupiotis-Kapeliaris Nikolas Gavalakis Konstantinos Koutis Dimitris Lamparas Giorgos Melissourgos George Nikolaidis Nikolaos Sapountzis Loukas-Vasilios Skouras Maria Stampoulou Giorgos Voudimos Thomas Kogias Ilias Xidias Dimitris Zissis Research Labs MarineTraffic Athens Greece Department of Product & Systems Design Engineering University of the Aegean Ermoupoli Greece

This paper describes the work completed for the design and development of a prototype autonomous boat (or autonomous surface vessel). The goal of the boat was to compete in a number of races, which were part of the International Aegean Ro-Boat Races, sailing completely autonomously, that is using onboard data sensors and processing, so as to navigate safely, without any input from shore. It outlines the path to development from initial concept and requirements, to detailed design of the physical and software systems, complete to the first sea trials. We describe how the boat performs the entire Sense-Think-Act paradigm on board, at sea, while using occupancy grids to safely navigate and avoid collisions. The boat perceives its surroundings through a collection of low-cost sensors (such as cameras, LIDAR, etc) that are used to map the environment. Following this, path and trajectory planning algorithms, navigate the boat safely and free of collisions towards its destination. Overall this work demonstrates the potential of using open source software and off the shelf components to build a cost effective autonomous vessel with advanced capabilities. Although the design purpose and requirements of this boat were very specific, the basic design of the boat can be adapted to different needs, environments and applications. The system has been extensively tested in various environments, including open water testing, and the results demonstrate its capacity to navigate safely and efficiently.

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Modeling the Integrated Flexible Job-Shop and Operator Scheduling in Flexible Manufacturing systems

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IFAC-PapersOnLine 2024年第19期58卷 343-348页

作者： Reza Ghorbani Saber Pieter Leyman El-Houssaine Aghezzaf Department of Industrial Engineering and Product Design Ghent University Technologiepark Zwijnaarde 46 9052 Zwijnaarde Belgium Industrial Systems Engineering Flanders Make@UGent Sint-Martens-Latemlaan 2B 8500 Kortrijk Belgium

This paper addresses the integrated flexible job shop and operators scheduling problem, introducing shift-based constraints on operators. We investigate how the advanced modeling and solution techniques, specifically, Mixed-Integer Programming (MIP) and Constraint Programming (CP) perform on this intricate scheduling problem. We test the effectiveness of both the MIP and CP models on an illustrative example as well as on a set of larger instances and draw conclusions, which indicate the need to integrate these two models into some approximation scheme to tackle large-scale instances for this complex problem.

关键词： Scheduling Flexible Job Shop Scheduling problem Dual-Resource Constrained scheduling Constraint Programming Mixed Integer Programming

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Roleplaying made easy – A Meta-model for Roles in systems engineering

Roleplaying made easy – A Meta-model for Roles in Systems E...

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IEEE International Symposium on systems engineering (ISSE)

作者： Eva-Maria Grote Daria Wilke Christian Koldewey Roman Dumitrescu IPEK - Institute of Product Engineering at Karlsruhe Institute of Technology Karlsruhe Germany Fraunhofer Institute for Mechatronic Systems Design (IEM) Paderborn Germany Heinz Nixdorf Institute (HNI) Advanced Systems Engineering Paderborn Germany

ISBN: (数字)9798350353723

ISBN: (纸本)9798350353730

Tomorrow’s products and services will be more intelligent, more connected, and more autonomous. product development is becoming more complex as well; and success will increasingly depend on transdisciplinarity and systems engineering. Competence and knowledge management are key factors in this evolution. Implementing clear and focused role models is one way of addressing these issues while making organizational structures more flexible. Role models are groups of company-specific role profiles with clearly defined tasks, competences, responsibilities, and authorities. This paper aims to develop a meta-model as the foundation for building role frameworks in systems engineering. It consists of actors, roles, and organizational tasks that are associated with each other as well as other elements. The meta-model, hence, structures the elements and relationships that must be considered when building a role model.

关键词： Industries Analytical models Face recognition Buildings Collaboration Companies Transforms Knowledge management product development Complexity theory

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