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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： Philipp Lelidis Axel Vick Production Machinery and Equipment Management Fraunhofer Institute for Production Systems and Design Technology IPK Berlin Germany Process Automation and Robotics Fraunhofer Institute for Production Systems and Design Technology IPK Berlin Germany

ISBN: (数字)9798350361230

ISBN: (纸本)9798350361247

To effectively utilize the capacities of the production facilities, flexible and fast transport, and manipulation technology is essential. Current path planning methods use simple paths without exploiting the physical limitations of mobile robots. This paper deals with the time-efficient kinematic planning of path and velocity trajectories for autonomous mobile robots equipped with a differential-drive, used to load and unload machine tools. For a close parking position next to the machine tools, the mobile robot must approach practically straight without the necessity of turning at the end. After a brief definition of the kinematics of a mobile robot with nonholonomic constraints, a Bezier-curve is combined with multiple jerk-limited velocity trajectories considering the initial and final state as well as the physical limitations. For a time-efficient acceleration and deceleration the maximum acceleration of the mobile robot is used and differentiated into the radial and tangential acceleration. This allows a quickly reached close parking pose next to a machine tool. The algorithm is tested with simulations in RVIZ in combination with Gazebo and ROS2 as well as with the real mobile robot Tend-o-Bot.

关键词： Kinematics Turning Production facilities Trajectory Planning Machine tools Mobile robots Manufacturing automation Load modeling Autonomous robots

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EXTENDED STUDY ON THE COMPOSITION OF MAGNETORHEOLOGICAL FLUIDS FOR THE POST-PROCESSING OF MICRO-MILLING TOOLS 39

EXTENDED STUDY ON THE COMPOSITION OF MAGNETORHEOLOGICAL FLUI...

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39th Annual Meeting of the American Society for Precision Engineering, ASPE 2024

作者： Sordon, Fabian Lahoda, Christian Polte, Mitchel Uhlmann, Eckart Maas, Jürgen Mechatronic Systems Lab EMK Technische Universität Berlin Germany Institute for Machine Tools and Factory Management IWF Technische Universität Berlin Germany Fraunhofer Institute for Production Systems and Design Technology IPK Germany

ISBN: (纸本)9781887706612

Cutting edge preparation is a critical step in the fabrication of micro-milling tools, helping to remove grain chipping and to reduce tool wear. In our previous research, we explored the use of magnetorheological fluids for directed immersed tumbling under magnetic excitation, demonstrating its potential through significant and precise material removal rates and reduced processing times. This study expands on that work by examining how the composition of the abrasive magnetorheological fluid affects surface quality and the long-term performance of the fluid. Various compositions of magnetorheological fluid samples were tested on high-speed steel specimens using a custom-designed test bench, which enables the variation of the magnetic field. The microgeometry of the cutting edges, including the maximum chipping, was recorded before and after processing. Results indicate that compositions yielding larger abrasive particles, combined with high magnetic and abrasive particle volume fractions lead to improvements in surface quality and material removal rate. © 2024 Proceedings - ASPE 2024 Annual Meeting. All rights reserved.

关键词： Magnetorheological fluids

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Requirements for an AI driven Extended Reality assistance system for assembly tasks

Requirements for an AI driven Extended Reality assistance sy...

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Virtual Reality (ICVR), IEEE International Conference on

作者： Kathrin Konkol Hannah Reusing Extended Reality Fraunhofer Institute for Production Systems and Design Technology IPK Berlin Germany

ISBN: (数字)9798350364231

ISBN: (纸本)9798350364248

Nine qualitative expert interviews were conducted to assess the requirements for an intelligent assistance system for virtual assembly in extended reality applications. The research interest lies in understanding current industry and research needs for assistance features of AR, VR, and MR applications that support manual assembly tasks. Additionally, the use of artificial intelligence as a supporting technology was investigated. We gathered expert opinions on relevant features and grouped them into seven categories: Augmentation of information in-situ, identification of components, provision of data, analysis of user action, analysis of environment, optimization of processes, and Usability improvements. The experts feedback on the concept of a software demonstrator was collected and structured. The research shows a need for adaptive assistance systems that are capable of categorizing the user’s actions and intent in order to assist efficiently.

关键词： Industries Data analysis Extended reality Manuals Software Artificial intelligence Usability Interviews Assembly Optimization

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High Resolution 2D-/3D-Scanning and Deep Learning Segmentation for Digitization of Fragmented Wall Paintings

High Resolution 2D-/3D-Scanning and Deep Learning Segmentati...

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2023 Eurographics Workshop on Graphics and Cultural Heritage, GCH 2023

作者： Kroeger, O. Krumpek, O. Koch, P. Pape, M. Schneider, J. Krueger, J. Fraunhofer Institute for Production Systems and Design Technology IPK Germany Technische Universität Berlin Germany MFB MusterFabrik Berlin GmbH Germany

ISBN: (纸本)9783038682172

The preservation and study of mural wall paintings often involve the collection of numerous fragments with unknown context. In this paper the authors present a case study involving a Roman wall painting discovered in 2013 at the European Cultural Park Bliesbruck-Reinheim. The objective of this work was to develop a semi-automated assistance system for the digitization, visualization, and digital repositioning of the Roman wall painting fragments. Therefore an easy-to-use scanner system was developed, that captures high-resolution 2D images of the front and back surfaces of the fragments, along with a height map of the backside. The contributing partners also developed a control and operating software for the scanner, as well as an automated software platform for visualization and repositioning of the digital fragments. The contributions of this paper include the introduction of a ML-based algorithm for background subtraction and segmentation of the front surface of the fragments. The technical realisation for fast and accurate image acquisition of the fragments, including sensor registration and high-resolution capture, has been worked out. The system calibration process, hardware setup and data correction techniques are described in detail. Additionally, the challenges of pixel-wise image segmentation for distinguishing between background, inner contour (wall painting), and outer contour (fragment surface without painting) are discussed. Our proposed approach overcomes the limitations of training ML algorithms on high-resolution images by employing patch-wise training and leveraging small features instead of large-scale features. The digitization and segmentation process demonstrated promising results in preserving and reconstructing the roman wall painting fragments. The findings of this study contribute to the field of cultural heritage preservation and provide valuable insights as the developed equipment and methods are highly transferable to future digitization

关键词： Image segmentation

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Semi-automatic process control for efficient refurbishment of turbine blades 23

Semi-automatic process control for efficient refurbishment o...

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23rd International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2023

作者： Uhlmann, E. Polte, J. Mühlich, C. Mönchinger, S. Ebrahimi, P. Technische Universität Berlin Institute for Machine Tools and Factory Management IWF Germany Fraunhofer Institute for Production Systems and Design Technology IPK Germany Gestalt Robotics GmbH Germany Germany

ISBN: (纸本)9781998999132

The refurbishment of turbine blades requires the precise removal of damaged surface coatings. In manufacturing companies, this usually involves time-consuming activities such as detecting residual coatings and adapting process settings to varying turbine blade geometries. The use of automated systems therefore opens up opportunities to improve the efficiency of turbine blade refurbishment processes by replacing manual tasks. This paper presents an conceptual approach for a semi-automatic decoating process of turbine blades that integrates abrasive blasting technology into a closed loop process control system. The experimental setup consists of a robot for guiding the turbine blade in a blast machine and a nozzle system for local removal of residual coatings using abrasive material. Based on image processing the residual coatings of a turbine blade are labeled by a neural network and mapped to a 3D model of the turbine blade, which is used by a software control system to coordinate the decoating process. Using a prototype setup this paper investigates the applicability of the proposed approach and evaluates its feasibility. © 2023 Euspen Headquarters.

关键词： Turbomachine blades

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Challenges and Opportunities of Enterprises Network design and Services

Challenges and Opportunities of Enterprises Network Design a...

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2022 Interoperability for Enterprise Systems and Applications Workshops, I-ESA Workshops 2022

作者： Jaekel, Frank-Walter Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstr. 8-9 BerlinD-10587 Germany

Enterprise networks in terms of business partners cooperating to achieve common business objectives are challenged by communication and technical conditions. A usual way to manage these challenges is to look from a single enterprise perspective. If it is a large organisation it tries to force the partners to follow its strategy. In terms of small or medium size companies they try to follow standards or the requests of larger organisations. However, the investment to improve the business is located within single partners of the network. This raises the question of which technology and standard will be suitable in the future. The related technology changes can require high investments. The question arises which technology, standard, IT system, architecture, model should be used. The paper will discuss the use of enterprise models together with open source utilities to reduce the risk of loss of investments. Starting with the identification of requirements in the form of as-is models, the development of conceptual to-be models, the enrichment to implementation models and finally a realisation model that guides the implementation. In terms of a vision the paper will especially focus on the options for the software implementation and reduction of costs of change. © 2022 CEUR-WS. All rights reserved.

关键词： Investments

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The Use of Digital Twins to Overcome Semantic Barriers in Hyperconnected Ecosystems for Industry

The Use of Digital Twins to Overcome Semantic Barriers in Hy...

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2022 Interoperability for Enterprise Systems and Applications Workshops, I-ESA Workshops 2022

作者： Jaekel, Frank-Walter Gering, Patrick Knothe, Thomas Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstr. 8-9 BerlinD-10587 Germany

To establish business networks a match between businesses demands and potential partner information is required. Publicly available information on the Internet about companies, products and services usually don’t follow a common standard. The concept of a digital twin could be used to organise the different information and, in the future, to harmonise the way company data is made available on the web. Every company usually has a web presence, related documents, web pages and a trace on the web, which can be used for an initial structure of the digital twin. Hereby, first services for the correlations between partner companies and requirements can be designed. But it requires the management of legal aspects e.g. the access of bots to the public available information. The paper provides initial ideas and feasibility checks and it propose an evolution of the current heterogeneous content and structure of the data into a well-structured digital twin including content related ontologies to describe the company characteristics. © 2022 CEUR-WS. All rights reserved.

关键词： Supply chains

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Automated 2D-3D-Mapping and Assessment of Defects Obtained from 2D Image Detection on a 3D Model for Efficient Repair of Industrial Turbine Blades 1

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10th International Conference on Sustainable design and Manufacturing, KES-SDM 2023

作者： Joost, Robert Mönchinger, Stephan Engeländer, Lukas Lindow, Kai Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstraße 8-9 Berlin10587 Germany Technische Universität Berlin Straße des 17. Juni 135 Berlin10623 Germany

ISBN: (数字)9789819981595

ISBN: (纸本)9789819981588

Manufacturing processes suited to repair worn-out machine parts are increasingly gaining traction in industrial practice. This evolution is driven by the desire to contribute to sustainable production by extending the lifetime of a part, and methods and machine tools have evolved in the last years, such that the refurbishment reaches equivalent quality compared to new parts. Yet, repair processes often remain too tedious and expensive to be profitable, and are therefore not put in practice. This could be prevented by increased efficiency and automation. In order to repair parts, the defects need to be detected and assessed. This task lies in the field of Reverse Engineering (RE). In the scope of repair and overhaul, RE aims to obtain data and models that can be fed to subsequent applications, such as path planning for additive manufacturing. This paper presents a highly automated process for defect inspection by the example of industrial turbine blades. The current process requires many analogue work steps and human intervention. The developed software processes defects obtained by AI-based image classification. It mainly consists of camera scene calibration, 3D pose estimation, and 2D-3D-mapping. The gained value is the new composition of existing technologies and their customization for turbine blades. Accuracy and computational duration are assessed. The presented method is able to enhance the reparation process and can be deployed to different applications and industries. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Turbomachine blades

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Supporting Changes in Digital Ownership and Data Sovereignty Across the Automotive Value Chain with Catena-X

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Procedia Computer Science 2025年 253卷 374-383页

作者： Marvin Manoury Theresa Riedelsheimer Malte Hellmeier Tom Meyer Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstrasse 8-9 10587 Berlin Germany Fraunhofer Institute for Software and Systems Engineering ISST Speicherstraße 6 44147 Dortmund Germany

Considering the concept of a Circular Economy, which entails several life cycles of, e.g., vehicles, their components, and materials, it is important to investigate how the respective Digital Twins are managed over the lifecycle of their physical assets. This publication presents and compares three approaches for managing Digital Twins in industrial use cases. For the aggregation of these approaches, a user-centered design approach has been used in the research project Catena-X which focuses on the automotive industry. The results are analyzed qualitatively based on aspects such as data ownership and data sovereignty. It was identified, that all three approaches have limitations and benefits which make them useful in different scenarios. An overview of their strengths and weaknesses is presented to select an appropriate approach In similar setups. The results described in this publication can be used to select the best update approach in data spaces where multiple stakeholders are able to update information on a single asset.

关键词： Digital Twins Ownership Circular Economy Data Sovereignty Supply Chain Catena-X

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Inertial Measurement Unit based Human Action Recognition for Soft-Robotic Exoskeleton 13

Inertial Measurement Unit based Human Action Recognition for...

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13th International DAAAM Baltic Conference and 29th International Baltic Conference, BALTMATTRIB 2021

作者： Kuschan, Jan Burgdorff, Moritz Filaretov, Hristo Krüger, Jörg Fraunhofer Institute for Production Systems Design Technology IPK Germany

Absence from work caused by overloading the musculoskeletal system lowers the life quality of the worker and gains unnecessary costs for both the employer and the health system. Exoskeletons can present a solution. Typically, such systems struggle with stiffness and discomfort and primarily a lack of battery lifetime. Soft-robotic exoskeletons offer a possibility to overcome these problems by increasing the system flexibility, not limiting the supported DoF and being actuator and joint together. Since soft-robotic exoskeletons can be designed only using power when supporting the wearer, it is possible to increase the battery lifetime by only acting on those actions for which the wearer needs support. Dealing with controls for soft-robotic exoskeleton one major difficulty is to find a compromise between saving energy and supporting the wearer. Having an action-depending control can reduce the supported actions to cover only relevant ones and increase the lifetime of the battery. The system conditions are to detect the user actions in real-time and distinguish between actions which require support and those which do not. We contribute an analysis and modification of human action recognition (HAR) benchmark algorithms from activities of the daily living, transferred them onto industrial use cases containing short and mid-term action and reduce the models to be compatible using embedded computers for real-time recognition on soft exoskeletons. We identified the most common challenges for inertial measurement units based HAR and compare the best-performing algorithms using a newly recorded data set overhead car assembly for industrial relevance. As a benchmark data set we focused on the"Opportunity" data set. By introducing orientation estimation, we were able to increase the F1 scores by up to 0.04. With an overall F1 score without a Null-class of up to 0.883, we were able to lay the foundation to use HAR for action dependent force support. © 2021 DAAAM International. A

关键词： Musculoskeletal system

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