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50th International Congress and Exposition of Noise Control Engineering, INTER-NOISE 2021

作者： Pereira, Luiz Henrique Mesa Casa Knöfel, Björn Troge, Jan Drossel, Welf-Guntram Klein, Marcel Hübelt, Jörn Fraunhofer Institute for Machine Tools and Forming Technology IWU Nöthnitzer Straße 44 Dresden01087 Germany Mittweida University of Applied Sciences Technikumplatz 17 Mittweida09648 Germany

ISBN: (纸本)9781732598652

Research on the relation between exposure to noise and cognitive performance inside industrial environments is not as broad as on office environments. For a better understanding of the specific industrial noise problems, 23 participants performed arithmetic tests inside a hemi anechoic room while they were exposed to a sequence of sound from five typical industrial noise sources. The subjects also classified how annoying they perceived the noise signals. The effects of noise on the arithmetic test's performance of the 23 participants was found on accuracy and on velocity, although the p-values of a Student t-test are comparable high. Dividing the subjects into a group of more noise annoyed resp. a group of less noise annoyed participants revealed significant influences of the presence of noise compared to an initial test without noise. The more annoyed subjects exhibit a drop of accuracy (-4%, p=0.017) while the less annoyed subjects increase significantly their velocity in the test (+15%, p=0.001). Subjects that evaluated noise as more annoying performed worse in a final arithmetic test (under silence) after being exposed to the noises, indicating a possible cumulative effect of noise on performance. The findings provide a better insight in the cognitive behavior of people who are exposed to industrial noise. Hence, the study will proceed with the specific noise analysis of single industrial workplaces. © INTER-NOISE 2021 .All right reserved.

关键词： Testing

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Hybrid approach to evaluate surface integrity based on grinding power and Barkhausen noise 6th

Hybrid approach to evaluate surface integrity based on grind...

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6th CIRP Conference on Surface Integrity, CSI 2022

作者： Heinzel, Jonas Jedamski, Rahel Rößler, Maximilian Karpuschewski, Bernhard Epp, Jérémy Dix, Martin Mapex Center For Materials And Processes University Of Bremen Bibliothekstr. 1 Bremen28359 Germany Leibniz Institute For Materials Engineering Iwt Badgasteiner Str. 3 Bremen28359 Germany Fraunhofer Institute For Machine Tools And Forming Technology Reichenhainer Straße 88 Chemnitz09126 Germany

In this paper the potential of a reliable characterization of surface and subsurface properties is presented by measurement of process forces for determining the specific grinding power Pc and the micromagnetic Barkhausen noise in cylindrical grinding trials. Therefore different dressing conditions by grinding with conventional wheel with varying process parameters are investigated. It is shown that an identified lower thermal limit in a Pc-t-diagram (contact time t) to prevent tempering zones in the ground surface and subsurface area of case hardened steel is applicable even if the condition of the grinding wheel is intentionally influenced by dressing. Finally a soft sensor concept for the use of the specific grinding power and in perspective also the use of the Barkhausen noise for process control is derived. © 2022 The Authors.

关键词： Grinding (machining)

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Synergy Analysis and verification of connected Cyber Physical Systems using virtual commissioning 14

Synergy Analysis and verification of connected Cyber Physica...

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14th CIRP Conference on Intelligent Computation in Manufacturing Engineering, CIRP ICME 2020

作者： Allmacher, Christoph Seiderer, Anna Klimant, Philipp Kuhl, Michael Institute for Machine Tools and Production Processes Chemnitz University of Technology Reichenhainer Str. 70 Chemnitz09126 Germany Mittweida University of Applied Sciences Technikumplatz 17 Mittweida09648 Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 Chemnitz09126 Germany

The design of cyber physical systems in today's production and intralogistics is influenced by the increasing availability and exchange of data. On the one hand, synergies between connected systems can be used to develop lightweight applications by sharing and reusing data. On the other hand, the possible combinations between these systems increase the complexity and design options. This paper presents a method to structure possible design options systematically and proposes virtual commissioning as solution for their analysis and verification to enable early design decisions. The method is demonstrated using an automated guided vehicle combined with a tactile warning device. © 2021 The Authors. Published by Elsevier B.V.

关键词： Cyber Physical System

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Comparative analysis of topology optimization versus material substitution: Is there a best method for vehicle weight reduction?

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Procedia CIRP 2024年 128卷 132-137页

作者： Gibson P. Chirinda Stephen Matope Philani Zincume Whisper Maisiri Andreas Sterzing University of Stellenbosch Private Bag X1 Matieland Stellenbosch 7602 South Africa North West University Private Bag X6001 Potchefstroom 2531 11 Hoffman Street South Africa Fraunhofer Institute of Machine Tools and Forming Technology IWU Reichenhainer Straße 88 09126 Chemnitz Germany

The United Nations (UN) Sustainable Development Goal 13 focuses on taking urgent action to combat climate change and its impacts. Resource efficient production and strict emission regulations have made vehicle weight reduction a subject of great interest. Common lightweighting techniques include topology optimization and material substitution. The benefits include reduced raw material usage, low fuel consumption, and low carbon emissions. There is a gap in the complex balance of decision-making. If an engineer is faced with the option of topologically optimizing or materially substituting, is one method better than the other? This paper comparatively analyses these lightweight design strategies.

关键词： topology optimization material substitution lightweighting automotive industry

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Usage-based leasing of complex manufacturing systems: A method to transform current ownership-based into pay-per-use business models 55

Usage-based leasing of complex manufacturing systems: A meth...

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55th CIRP Conference on Manufacturing Systems, CIRP CMS 2022

作者： Alaluss, Mohaned Drechsler, Chris Kurth, Robin Mauersberger, Anton Ihlenfeldt, Steffen Marré, Michael Labs, Rainer Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 Chemnitz09126 Germany Institute of Mechatronic Engineering Technische Universität Dresden Helmholtzstr. 7a Dresden01069 Germany South Westphalia University of Applied Sciences Frauenstuhlweg 31 Iserlohn58644 Germany

Manufacturing technology with its cost- and resource-intensive manufacturing machines like machine tools, whose amortization often takes several years, is characterized by a high degree of individualization. Here, the need for increasingly complex as well as individualized products leads to the demand for high flexibility and resilience in complex manufacturing systems. The increasing uncertainty and volatility in the markets pose high economic risks for machine operators with ownership-based business models to enter new technologies. Consequently, this restrains the innovative and creative power of manufacturing companies. Although leasing models exist in various industry sectors like printing industry or compressed air supply, their implementation is still challenging due to the high degree of complexity regarding machine system, process, and services of the leasing product. In this paper, a novel method, with increased consideration of technical-technological aspects, to transform current ownership-based into usage-based business models like pay-per-use, is proposed. The resulting method also considers the pay-per-use readiness through an initial assessment of the existing manufacturing system. © 2022 The Authors. Published by Elsevier B.V.

关键词： agile production business models industry 4.0 machine tools manufacturing machines method pay-per-use perfomance-based contracting

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Application of Fourier-related data reduction methods in sheet metal forming 14

Application of Fourier-related data reduction methods in she...

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14th CIRP Conference on Intelligent Computation in Manufacturing Engineering, CIRP ICME 2020

作者： Schwarz, Christian Link, Patrick Ihlenfeldt, Steffen Drossel, Welf-Guntram Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Strasse 88 Chemnitz09126 Germany Institute of Mechatronic Engineering TU Dresden Helmholtzstrasse 7a Dresden01062 Germany Institute for Machine Tools and Production Processes TU Chemnitz Reichenhainer Strasse 70 Chemnitz09126 Germany

Due to the increasing digitalization, modern solutions are needed to work effectively with rapidly growing amounts of data in the automotive production. This paper shows two potential fields of application for the practical use of data reduction methods. In particular, the combination of Fourier-related transformation methods (e.g. discrete Fourier transform) and surrogate models for the useful 3D visualization of complex interrelationships is shown using the example of press hardening and deep drawing. © 2021 The Authors. Published by Elsevier B.V.

关键词： Finite element method

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Examination of the variance in human pathways in HRC with heavy duty-robots for safe process planning 13

Examination of the variance in human pathways in HRC with he...

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13th CIRP Conference on Intelligent Computation in Manufacturing Engineering, CIRP ICME 2019

作者： Bdiwi, Mohamad Harsch, Ann-Kathrin Reindel, Paul Putz, Matthias Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainerstr. 88 Chemnitz09126 Germany

Compared to robots, human pathways are individually changeable. Particularly the human-robot-collaboration (HRC) with heavy-duty robots carry high risk potentials. To ensure safety and efficiency, the human variance in pathways should be determined in the planning of HRC. Hence this paper presents a method to investigate human pathway variations in a real study. In systematically selected tasks, human pathways are examined for 100 participants in manual and human-robot collaboration (HRC) scenarios. As a result, the variations of pathways are presented depending on various features: in nearly all cases the variance of women's walking pathways is smaller than that of men. © 2020 The Authors.

关键词： Robot programming

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Automated design of product-flexible car body fixtures with software-supported part alignment using particle swarm optimization 13

Automated design of product-flexible car body fixtures with ...

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13th CIRP Conference on Intelligent Computation in Manufacturing Engineering, CIRP ICME 2019

作者： Fritzsche, Rayk Voigt, Eric Schaffrath, Robert Todtermuschke, Marcel Röber, Marcel Group Assembly systems Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 Chemnitz09126 Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 Chemnitz09126 Germany Dep. Assembly Systems Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 Chemnitz09126 Germany

The fraunhofer IWU has been developed specialized clamping robots for production of different car-models on one fixture. As a base for the fixture design, a method for optimal part alignment has been developed. For handling multitude of possibilities regarding the alignment of parts from different car-models, a specific software tool using particle swarm optimization has been created. The objective was to achieve similar travels for all clamping robots in this fixture. To facilitate the integration of the automated part alignment into fixture design, a further software. © 2020 The Authors.

关键词： Particle swarm optimization (PSO)

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Framework for increasing sustainability of factory systems by generative layout design

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Procedia CIRP 2022年 105卷 345-350页

作者： Marian Süße Steffen Ihlenfeldt Matthias Putz Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz Germany Institute of Mechatronic Engineering Technische Universität Dresden Dresden Germany Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Chemnitz Germany

The structure of factory systems has a long-term impact on the productivity and performance of production systems. With an increasing relevance of decentral renewable energy sources, factory planning becomes more complex due to an increase of decision criteria and possible solutions, but ecological impacts are also growingly depending on early structure decisions. However, decisions during planning processes in industry are still based on experience, qualitative assessments and discussions. Thus, planning results may not exploit the potential of the available solution space, nor do they allow quantitative traceability of layout configurations. Generative Design (GD) gained popularity in topology optimization and building construction and provides promising opportunities for complex design tasks. Not least with the increasing relevance of Building Information Modeling (BIM) in manufacturing, new methods and technologies for optimization become available to factory planners. Hence, the paper describes options for enhanced decisions in sustainable factory layout planning. Therefore, it provides a quick overview on optimization and GD in layout planning as well as the relation towards BIM and sustainability assessment. Based on this, possible extensions of optimization targets and boundaries towards energy and sustainability-related criteria is elaborated. Afterwards, necessary and potential data acquisition with the openBIM-related Industry Foundation Classes (IFC) is discussed. The paper concludes with an outlook towards further investigations on the overlap of layout design, BIM and sustainability.

关键词： Factory Planning Sustainable development Generative design Building Information Modeling (BIM)

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The Challenge of Open Cellular Metal Foam Production 11th

The Challenge of Open Cellular Metal Foam Production

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11th International Conference on Porous Metals and Metallic Foams, MetFoam 2019

作者： Hannemann, Christian Uhlig, Mandy Hipke, Thomas Meier, Iris Fraunhofer-Institute for Machine Tools and Forming Technology Reichenhainer Str. 88 Chemnitz09126 Germany

ISBN: (纸本)9783030427979

Five years ago fraunhofer-IWU started research in open cellular metal structures as the potential applications increased based upon their exceptional properties. Heat exchangers, filters, and battery electrodes are examples of potential applications. As casted aluminum foams were in serial production and fraunhofer in close cooperation with the manufacturer, the interest was limited to prototyping of individual foams especially in combination with solid regions for fixing, encasing, or sub-division. New parameter combinations and technological processes were developed and the advantages, limitations, and potentials are described within this document. Alternatively, galvanic coating of PUR foams with copper, nickel, and other metals is common, again buyable and state of the art. R&D activities related to application development and adapted geometries not yet realizable by conventional mass production will be shown. Investigations for graded strut-structures and cylindrical tube-like parts were intensified to reach serial production level. The lecture represents investigations, results, dropped, and new approaches of all routes. © 2020, The Minerals, Metals & Materials Society.

关键词： Metal foams

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