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ASME 2024 International Mechanical Engineering Congress and Exposition, IMECE 2024

作者： Peters, Julian Menning, Johannes D.M. Ewert, Arthur Prokopchuk, Artem Breimann, Richard Herbst, Felix Riehl, David Döllken, Markus Vorrath, E.-F. Markus Wallmersperger, Thomas Schlecht, Berthold Kirchner, Eckhard Kupnik, Mario Hofmann, Klaus Matthiesen, Sven Institute of Product Engineering Karlsruhe Institute of Technology Germany Institute of Solid Mechanics Technische Universität Dresden Germany Institute of Machine Elements and Machine Design Technische Universität Dresden Germany Institute of Semiconductors and Microsystems Technische Universität Dresden Germany Institute for product development and machine elements Technical University of Darmstadt Germany Measurement and Sensor Technology Group Technical University of Darmstadt Germany Integrated Electronic Systems Lab Technical University of Darmstadt Germany

ISBN: (纸本)9780791888599

In industrial digitization, data-driven analysis like condition monitoring and predictive maintenance relies on extensive measurement data. However, there’s often a lack of data on machine or system states. Sensor-integrating machine elements (SiME) can address this gap due to their widespread use, standardization, and in-situ measurement capability. Yet, integrating sensors typically compromises mechanical function. To ensure broad usability and retrofitting, maintaining mechanical functions to a defined degree is crucial. General procedures for systematically finding optimal design space solutions are lacking. In prior work, a procedure was developed for multi-axial force sensor integration into M20 bolts. This contribution demonstrates the procedure’s applicability to (1) M12 bolts for uni-axial force measurements using strain gauges, and (2) jaw couplings for torque measurement using capacitive sensors. Results indicate the procedure’s efficacy in both cases, yielding viable design space parameters. However, constructing an optimization function for jaw couplings in the final step was not feasible, as both mechanical and sensory function fulfillment indices pointed in the same direction. © 2024 by ASME.

关键词： Bolts

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Method for CAD/CAM-based production of patient-specific anatomical bone surrogates from polyurethane rigid foams of different densities for various clinical applications

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Current Directions in Biomedical Engineering 2023年第1期9卷 77-80页

作者： Sembdner, Philipp Blaurock, Karl Paetzold-Byhain, Kristin Institute of Machine Elements and Machine Design George-Bähr-Straße 3c Dresden 01062 Germany

Physical models of bony areas are used in the medical environment for training, patient information or for various examinations. These are idealized average models which, however, do not reflect the individuality of a respective patient. Furthermore, the mechanical properties of the bony structure with cortical bone and cancellous bone are not considered in most models. A few manufacturers, such as SawBone, offer models and material blocks that approximate the properties of the bone. However, these are not patientspecific either. This paper presents a proposal for a method to create patient-specific physical bone models with CAD/CAM technologies that approximate shape and mechanical properties. The models are made of two different rigid polyurethane foams for cortical bone and cancellous bone. The methodical development includes the elaboration of a framework starting from the patient's CT data, through design derivation, to fabrication. Furthermore, a possible process for fabrication in the form of a demonstrator and its application in sawing tests will be demonstrated. © 2023 the author(s), published by Walter de Gruyter Berlin/Boston.

关键词： Computer aided design

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Method for CAD/CAM-based production of patient-specific anatomical bone surrogates from polyurethane rigid foams of different densities for various clinical applications

Method for CAD/CAM-based production of patient-specific anat...

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作者： Sembdner, Philipp Blaurock, Karl Paetzold-Byhain, Kristin Institute of Machine Elements and Machine Design George-Bähr-Straße 3c Dresden01062 Germany

关键词： Computer aided design

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Additive Manufacturing of Ceramics opens the door to Components for Biomanufacturing Applications with high Functionality 6

Additive Manufacturing of Ceramics opens the door to Compone...

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6th CIRP Conference on BioManufacturing, BioM 2024

作者： Scheithauer, Uwe Holtzhausen, Stefan Wiemer, Hajo Fraunhofer Institute for Ceramic Technologies and Systems Group Additive and Hybrid Manufacturing Winterbergstr. 28 Dresden01277 Germany TUD Dresden University of Technology Institute of Machine Elements and Machine Design Virtual Product Development Group Advanced Geometric Modeling And Analysis Dresden01062 Germany TUD Dresden University of Technology Institute of Mechatronic Engineering Machine Tools Development and Adaptive Controls Department of Machine Data Processing Dresden01062 Germany

Significant advancements in production technology, materials, component design, and data science foster innovation across industries, including biomanufacturing. Ceramic materials, adapted additive manufacturing processes, and novel construction methods hold immense innovation potential due to ceramics' exceptional thermal, chemical, and mechanical properties. Additive manufacturing enables the creation of intricate ceramic components with unprecedented functionality. Hybridizing manufacturing technologies and materials facilitates direct integration of additional features like sensors and actuators. Despite their potential, ceramic materials remain underutilized. This article aims to spark a discourse on leveraging high-performance ceramic components in biomanufacturing, leveraging superior material properties, innovative design methods, additive manufacturing, process data analysis, and AI. © 2024 The Authors.

关键词： Ceramic materials

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Long-term outcomes of open treatment of condylar head fractures using cannulated headless bone screws—a retrospective analysis

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International Journal of Oral and Maxillofacial Surgery 2025年第7期54卷 598-606页

作者： Franke, A. Matschke, J.B. Sembdner, P. Seidler, A. McLeod, N.M.H. Leonhardt, H. Department of Oral and Maxillofacial Surgery University Hospital Carl Gustav Carus Dresden Technische Universität Dresden Dresden Germany Virtual Product Development Institute of Machine Elements and Machine Design TU Dresden Dresden Germany Oral and Maxillofacial Surgery University Hospitals Coventry and Warwickshire NHS Trust Coventry United Kingdom

The treatment of mandibular fractures affecting the condylar head (CHF) can be either closed or open. In the case of an open approach, the headless bone screw (HBS) is an option. This study was performed to investigate the efficacy of osteosynthesis with HBS using three-dimensional radiographic imaging and clinical evaluation over long-term follow-up. This was a single-centre retrospective study. Clinical parameters and three-dimensional radiographic scans were collected during follow-up, DICOM datasets were segmented, and model analysis was conducted. Forty-five patients who received a HBS and met the eligibility criteria were included. There were significant improvements in all clinical parameters (mouth opening, protrusion, laterotrusion;all P < 0.05) except for the laterotrusion of the unaffected side (P = 0.071). Mean volume and surface area changes (from postoperative (mean 1.9 days) to final follow-up (mean 1675 days)) were 127.2 mm³ and −22.4 mm², respectively, and were not statistically significant (P = 0.18 and P = 0.51). There were radiographic signs of condylar remodelling. Nine HBS in nine patients required removal due to the screw penetrating the articular surface of the healing condylar head. This single-centre retrospective study found good functional outcomes using HBS for CHF, with a screw removal rate of 20%. © 2025 The Authors

关键词： Bone screws Internal fracture fixation Mandibular condyle Mandibular fractures Open fracture reduction Three-dimensional imaging Traumatology

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Complexity Coping by Methodical Agile and Modular Product Development - A Bibliometric Review

Complexity Coping by Methodical Agile and Modular Product De...

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2023 IEEE International Conference on Industrial Engineering and Engineering Management, IEEM 2023

作者： Zuefle, M. Rennpferdt, C. Batora, M. Bursac, N. Krause, D. Hamburg University of Technology Institute of Product Development and Mechanical Engineering Design Germany Hamburg University of Technology Institute of Smart Engineering and Machine Elements Hamburg Germany

ISBN: (纸本)9798350323153

This bibliometric analysis identifies the extent to which the methodical development of modular product families (product side) and agile project development (process side) can be beneficial for coping with complex product development tasks. The accomplished co-occurrence analysis reveals an indirect relationship between the development of modular product families and agile product development. This indirect connection is because the different methods are incorporated in the field of design Methodology. However, the analysis leaves a gap in the direct interaction of both subjects, a subsequently accomplished bibliographic coupling points out. A consecutive in-depth abstract and paper analysis reveals further research on their integration is necessary. © 2023 IEEE.

关键词： Agile Development Bibliometric Analysis Modular design Modular Development System architecture

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Retrofitting Digital Twins of Existing Systems 10

Retrofitting Digital Twins of Existing Systems

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10th IEEE International Symposium on Systems Engineering, ISSE 2024

作者： Fett, Michel MacKo, Stanislav Wilking, Fabian Goetz, Stefan Wartzack, Sandro Kirchner, Eckhard Technical University Darmstadt Institute for Product Development and Machine Elements Darmstadt64287 Germany Friedrich-Alexander-Universität Erlangen-Nürnberg Engineering Design Erlangen91058 Germany

ISBN: (纸本)9798350353723

Digital Twins offer a wide range of potentials in an industrial context but are rarely used in practice. Small and medium-sized companies in particular face challenges that can only be overcome with great effort and risk. One of these challenges is the fact that the development of Digital Twins is a complex and interdisciplinary task, for which small and medium-sized companies can rarely provide the necessary resources. Another challenge is that tight budgets lead to equipment and systems being used for a longer time and often do not provide the necessary elements for the use of Digital Twins. Therefore, this article presents an approach for retrofitting existing systems for Digital Twins by considering its three domains: models, sensors and IT infrastructure. The results are illustrated using a case study. © 2024 IEEE.

关键词： Retrofitting

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HOLISTIC DIGITAL PRODUCT DEVELOPMENT PROCESS FOR TAILORED FIBRE PLACEMENT REINFORCED PARTS

HOLISTIC DIGITAL PRODUCT DEVELOPMENT PROCESS FOR TAILORED FI...

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SAMPE 2024 Conference and Exhibition

作者： Wollert, Lars Emmerich, Rebecca Schalm, Tobias Aguirre, Diego Lenz, Julia Gries, Thomas Institut für Textiltechnik RWTH Aachen University Germany Institute of Structural Mechanics and Lightweight Design RWTH Aachen University Germany Institute for Machine Elements and Systems Engineering RWTH Aachen University Germany

ISBN: (纸本)9781934551455

Due to the complexity of production, fibre-reinforced plastic components are often manufactured in small or medium series in time-consuming manual processes. When using load-optimised production technologies, the tailored fibre placement (TFP) process is well established. But, the product development process is time consuming. Here, the missing connection between different development steps (e.g. load case optimisation, FEM analysis, draping and path planning) often leads to multiple iterations. For this purpose, a digital tool with links to common engineering software as well as financial and economic evaluation tools is indispensable. Using TFP as semi-finished textile production method is a promising process for an efficient production of load-optimised components. Currently, only a few manufacturers have the know-how to develop products while directly considering the entire process chain. Within the framework of the research project DigiPEP, a digitalisation of the entire product development process for TFP reinforced composite parts is being developed. Starting from a defined component geometry, the aim is first to simplify the development process through automated design processes and the implementation of the path planning of the embroidery pattern. In addition to the design of the optimal paths and component thickness, a draping model is part of the digital process chain. Especially for the mechanical design, a broad database for TFP preforms is required. For this purpose, critical shear angles for TFP semi-finished textiles with different manufacturing parameters are determined. For this, shear frame tests and an optical measurement method are used. These parameters can be used in the following for the implementation of the drape model and the transformation from 2D to 3D data. © 2024 Soc. for the Advancement of Material and Process Engineering. All rights reserved.

关键词： Fiber reinforced plastics

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Multiaxial fatigue crack initiation in bolted sheet material

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Procedia Structural Integrity 2023年 43卷 41-46页

作者： Robert Szlosarek Matthias Kröger Institute for Machine Elements Design and Manufacturing Agricolastraße 1 09599 Freiberg Germany

Bolted joints are one of the most used joining technologies in mechanical engineering. Regarding a long lifetime of the joint it is essential to prevent a fatigue failure of the bolt and a fatigue crack initiation near the borehole. In the contact zone between the sheet and the bolt head respectively nut, a multiaxial stress situation arises due to the preload of the bolt and the stresses due to the loading of the machinery. The presented research observes the correlation between the preload and load cycles to fatigue crack initiation. Therefore, a specific test setup was developed and used for a comprehensive test series with a metric bolt of diameter 22 mm and a plate made of steel S355MC (1.0976). The results show significant disparities dependent on the preload. For low preloads the fatigue cracks arise directly at the borehole and after less than 100,000 cycles. For high preloads the cracks arise in the contact zone between the nut and the sheet material. Additionally, the number of load cycles to failure increases with the preload. The stress state as well as the contact stresses were investigated by a finite element analysis. The numerical results were used for a multiaxial fatigue and contact analysis.

关键词： bolted joint borehole preload multiaxial fretting

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Evolving Roles in Systems Engineering —- Insights from Germany's Mechanical and Plant Engineering Sector

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INCOSE International Symposium 2024年第1期34卷 1413-1428页

作者： Kaiser, Lydia Wilke, Daria Förster, Felix Köhler, Ingmarie Dumitrescu, Roman Technische Universität Berlin and Einstein Center Digital Future Berlin Germany Fraunhofer Research Institute for Mechatronic Systems Design IEM Paderborn Germany Hamburg University of Technology Institute of Smart Engineering and Machine Elements Hamburg Germany Technische Universität Berlin Berlin Germany

Systems Engineering is developing differently in each sector and region. In German industry, especially in mechanical and plant engineering, Systems Engineering is of major importance. The introduction of Systems Engineering raises the question of which roles and competencies are required. This article examines the evolution of roles in Systems Engineering from a German perspective. Based on a literature review, the evolution of the identified Systems Engineering roles over time is shown, starting with the seminal publication by Sheard in 1996. It points out that only minimal adjustments and occasional role renaming have occurred. However, the review shows a common understanding of essential areas of responsibility within the SE and changes over time. The next step is to examine the current understanding of Systems Engineering roles in the industry. A quantitative analysis of job postings in Germany reveals a diverse interpretation of the term 'Systems Engineer;more than half of the positions cannot be categorized according to the INCOSE definitions. The job postings are used to determine which tasks are associated with the job, how often they occur, and in what combination. The primary responsibilities of systems engineers include creating and managing requirements, architecture processes, validation, and verification processes, and coordinating with customers and stakeholders. Finally, three representative companies from the mechanical and plant engineering sector were selected to analyze existing roles and tasks. From this, a common understanding of tasks and responsibilities is combined and organized into clusters. These are used by the companies to locate and thus derive their roles. The result is in an integrative approach that enables companies, especially in the midsize and medium sectors, to design the introduction in line with stakeholder demands. In summary, the industry's ongoing adaptation necessitates the evolution of Systems Engineering roles and comp

关键词： Systems Engineering Roles German Industry Role Evolution Competencies Job postings Literature Review

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