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34th CIRP Design Conference, CIRP 2024

作者： Chirinda, Gibson P. Matope, Stephen Zincume, Philani Maisiri, Whisper Sterzing, Andreas University of Stellenbosch Private Bag X1 Matieland Stellenbosch7602 South Africa North West University Private Bag X6001 11 Hoffman Street Potchefstroom2531 South Africa Fraunhofer Institute of Machine Tools and Forming Technology IWU Reichenhainer Straße 88 Chemnitz09126 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. © 2024 Elsevier B.V.. All rights reserved.

关键词： Low emission

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Test bench development and validation for blocked force measurements in six degrees of freedom 50

Test bench development and validation for blocked force meas...

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

作者： Burkhardt, Martin Hensel, Eric Drossel, Welf-Guntram Fraunhofer Institute for Machine Tools and Forming Technology IWU Nöthnitzer Str. 44 Dresden01187 Germany

ISBN: (纸本)9781732598652

For transfer path analysis (TPA) methods, the description of the source is essential. The possibilities of source characterization are as different as the TPA methods. For the classical methods, the source is considered in the assembled state with feedback from the receiver structure, while for component-based TPA the source is described without feedback from the coupled structure. In addition to TPA, source characterization is also used in the product development process for evaluation or comparisons. Also in these cases, the source must be characterized without feedback from the test structure, which can generally be realized by measuring free velocities or blocked forces. Because of the need for an external load to reach the components operating point, force measurements are often used. However, the realization of a test setup without significant influences on the measurement of forces poses some challenges. The paper presents a setup that can be used to perform a direct force measurement at one point in six degrees of freedom (dof). The necessary boundary conditions to approximate the idealized blocked force assumption are discussed, the calculation of the blocked force in six dof is presented, the structural dynamic response at a reference point is calculated and compared with operational measurements. © INTER-NOISE 2021 .All right reserved.

关键词： Force measurement

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Framework for increasing sustainability of factory systems by generative layout design 29

Framework for increasing sustainability of factory systems b...

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29th CIRP Conference on Life Cycle Engineering, LCE 2022

作者： Süße, Marian Ihlenfeldt, Steffen Putz, Matthias 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. © 2022 Elsevier B.V.. All rights reserved.

关键词： Sustainable development

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Design requirements for a modular framework of industrial surface defect detection system designs in the context of machined, automotive workpieces

Design requirements for a modular framework of industrial su...

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IEEE International Conference on Industrial Informatics (INDIN)

作者： Marco Wagenstetter Thomas Aicher Arvid Hellmich Steffen Ihlenfeldt Powertrain Production System Planning BMW Group Munich Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Dresden Germany

The planning phases of industrial surface defect detection systems for machined, automotive workpieces are time-consuming and require project teams comprised of experts from different disciplines in order to achieve optimal systems regarding the prioritized objectives. To master this challenge current research is aiming for flexible inspection system concepts that are not application-specific and thus can be used for a range of industry-dependent specifications without the necessity to complete each planning phase from the beginning. This paper presents a thorough analysis of the influencing factors at the beginning of the inspection planning process of an industrial surface defect detection system for machined, automotive workpieces. Based on this analysis, design requirements for a modular framework for industrial surface defect detection system designs in this sector are derived and contextualized with available system components. Finally, an outlook for future research is presented with the goal to further increase the flexibility of industrial surface defect detection systems.

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Coupled CFD model of tool environment and workspace to determine the convective heat transfer in jet cooling of milling processes in machine tools

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Procedia CIRP 2025年 133卷 280-285页

作者： Steffen Brier Alexander Geist Janine Glänzel Christian Naumann Joachim Regel Martin Dix Steffen Ihlenfeldt Chemnitz University of Technology Professorship Production Systems and Processes Reichenhainer Str. 70 09126 Chemnitz Germany Fraunhofer-Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 09126 Chemnitz Germany Technical University Dresden Institute for Machine Tools Development and Adaptive Controls Helmholtzstraße 10 01069 Dresden Germany

The responsible use of resources is an essential part of the manufacturing of industrial products. This includes the economical use of cooling lubricant and requires precise knowledge of the cooling mechanisms and their effect on the accuracy of the machine tool and thus the thermal error. A temporal and spatial resolution of the dynamic coolant flow near the tool and in the entire workspace in a single model would require a large simulation time. Therefore, a composite model was developed, that consists of a near-tool model and a larger surrounding workspace model. The required static near-tool cooling lubricant distribution is obtained via data discretization methods from a separate static simulation that resolves the turbulence of the cooling lubricant created by the tool rotation. The identified coolant distribution is integrated into a CFD near-tool model (with simplified tool geometry) which is coupled with a surrounding CFD workspace model. The workspace model is thus able to identify the effects of the coolant wetting on the machine surface temperature and finally, using thermo-elastic FEM simulations, on the resulting thermal error. This approach allows the composite model to simulate the entire workspace with reduced simulation effort and map the coolant-influenced heat transfer coefficients on the machine surface.

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An assessment method of machine components for usage-based value creation in complex manufacturing systems

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Procedia CIRP 2023年 120卷 225-230页

作者： Mohaned Alaluss Robin Kurth Anton Mauersberger Chris Drechsler Steffen Ihlenfeldt Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 09126 Chemnitz Germany Institute of Mechatronic Engineering Dresden University of Technology Helmholtzstr. 7a 01069 Dresden Germany

Rising demands on manufacturing technologies lead to an increase in the complexity of corresponding machines and systems. This complexity acts as an obstacle to the development and realization of digital, usage-based business models for complex manufacturing systems. Particularly in the case of pay-per-use business models, it is necessary to monitor the actual machine load in operation to minimize the business risk on the operator and supplier side. This complicates the transition towards data-oriented value creation in manufacturing system environment. To overcome this challenge, a novel method to assess machine components regarding their potential to monitor the actual load and usage behavior of the whole manufacturing system is proposed. On this basis, the transparency and therefore confidence in digital, usage-based value creation like pay-per-use business models can be increased. The resulting approach is demonstrated by taking the example of a sheet metal forming press.

关键词： Methodology Manufacturing Forning Service Decision making

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Efficient evaluation of the acoustical behavior of gearboxes with various gear blanks using frequency based substructuring 27

Efficient evaluation of the acoustical behavior of gearboxes...

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27th International Congress on Sound and Vibration, ICSV 2021

作者： Hensel, Eric Bräunig, Jan Troge, Jan Stapf, Tom Drossel, Welf-Guntram Fraunhofer Institute for Machine Tools and Forming Technology Dresden Germany

ISBN: (纸本)9788378807995

In several industrial branches, the acoustical behavior of gearboxes plays a major role. In most cases, the transmission's noise is perceived as an annoying sound, the so-called gear whine with narrow-band spectral components. This tonal noise is caused by the gear mesh and is mainly dependent on the number of teeth as well as the corresponding rotational speed. In combination with the frequency-dependent structure-borne and airborne sound transfer paths of the gearbox and its subsequent systems, different speeds may lead to resonant system response due to the variable excitation frequencies. The purpose within the design process of gearboxes is the identification of such critical acoustic load conditions and the deviation of adequate measures to improve the acoustical behavior. As well known from other applications, the frequency based substructuring provides a methodology to evaluate the vibrations of a system consisting of different subsystems represented by frequency-dependent admittance functions. A main advantage of this method is that the single subsystems are independent from the mounting conditions. Within the present paper, the frequency based substructuring approach is used to evaluate the dynamic behavior of a single-stage gearbox with different gear blanks but equal tooth geometries. After a short introduction of the corresponding theory, the application of the frequency based substructuring method on gearbox dynamics is shown. In a next step, the simulation results are compared to experimental data obtained by test bench measurements with two different types of blanks - a reference model with no modifications as well as a gear with a metal foam core to change the stiffness of the gear blank significantly. Finally, the influences of different gear blanks are shown and discussed based on simulation results. © "Advances in Acoustics, Noise and Vibration - 2021" Proceedings of the 27th International Congress on Sound and Vibration, ICSV 2021. All rights re

关键词： Metals

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Increasing Resilience of Production Systems by Dynamic Context Modelling and Process Adaption 16

Increasing Resilience of Production Systems by Dynamic Conte...

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16th CIRP Conference on Intelligent Computation in Manufacturing Engineering, CIRP ICME 2022

作者： Wunderlich, Tim Hansert, Jonas Koch, Sandro Heinrich, Robert Schlegel, Thomas Ihlenfeldt, Steffen Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 Chemnitz09126 Germany Karlsruhe University of Applied Sciences Moltkestr. 30 Karlsruhe76133 Germany Karlsruhe Institute of Technology Am Fasanengarten 5 Karlsruhe76131 Germany Institute of Mechatronic Engineering Technische Universität Dresden Dresden01062 Germany

The requirements for cyber-physical production systems (CPPS) grow steadily, leading to increased complexity of such systems. To address issues due to reconfiguration or failures, we present an approach to creating a context model of the CPPS components during runtime and to detect deviations from the planned production processes. Furthermore, we present a concept for modelling production processes that allows for dynamic process adaption during runtime. We then utilize this process adaption and the context model to cope with unforeseen failures and increase the resilience of the system. Finally, we evaluate the feasibility of our approach by applying it to an Industry 4.0 production system. © 2023 Elsevier B.V.. All rights reserved.

关键词： Dynamics

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Characterization of 3D printed polymer mounts in translational and rotational DOF 30

Characterization of 3D printed polymer mounts in translation...

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30th International Conference on Noise and Vibration Engineering, ISMA 2022 and 9th International Conference on Uncertainty in Structural Dynamics, USD 2022

作者： Troge, J. Georgi, T. Hensel, E. de Klerk, D. Graf, M. Burkhardt, M. Fraunhofer Institute for Machine Tools and Forming Technology IWU Nöthnitzer Straße 44 Dresden01187 Germany VIBES.technology Molengraaffsingel 14 Delft2629JD Netherlands Fraunhofer Institute for Chemical Technology ICT Joseph-von-Fraunhofer Str. 7 Pfinztal76327 Germany

ISBN: (纸本)9789082893151

Mounts are important transfer elements to isolate structure-borne sound from a source to a receiver. The dynamic transfer behavior of a mount can be described using frequency dependent dynamic stiffness and damping. For determination of these parameters, a mount can be abstracted as a two-port element. The stiffness matrix of this element includes input, output and transfer stiffnesses for translational and rotational DOF. Especially the measurement of rotational DOF can be a challenge. A promising approach for this is the Virtual Point Transformation. Hereby, the dynamic behavior in a virtual point of a structure is calculated by combining signals from several vibration sensors. This approach was used to determine stiffness matrices of different polymer mounts, which were manufactured using a 3D printing process to ensure direction-dependent dynamic properties. This paper deals with the practical implementation of the method as well as the presentation of the results and deviations of the dynamic transmission behavior of the polymer mounts. © 2022 Proceedings of ISMA 2022 - International Conference on Noise and Vibration Engineering and USD 2022 - International Conference on Uncertainty in Structural Dynamics. All rights reserved.

关键词： Stiffness matrix

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A Nonlinear Delay Model for Metabolic Oscillations in Yeast Cells

arXiv

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arXiv 2023年

作者： Chumley, Max M. Khasawneh, Firas A. Otto, Andreas Gedeon, Tomas Michigan State University United States Fraunhofer Institute for Machine Tools and Forming Technology IWU Germany Montana State University United States

We introduce two time-delay models of metabolic oscillations in yeast cells. Our model tests a hypothesis that the oscillations occur as multiple pathways share a limited resource which we equate to the number of available ribosomes. We initially explore a single-protein model with a constraint equation governing the total resource available to the cell. The model is then extended to include three proteins that share a resource pool. Three approaches are considered at constant delay to numerically detect oscillations. First, we use a spectral element method to approximate the system as a discrete map and evaluate the stability of the linearized system about its equilibria by examining its eigenvalues. For the second method, we plot amplitudes of the simulation trajectories in 2D projections of the parameter space. We use a history function that is consistent with published experimental results to obtain metabolic oscillations. Finally, the spectral element method is used to convert the system to a boundary value problem whose solutions correspond to approximate periodic solutions of the system. Our results show that certain combinations of total resource available and the time delay, lead to oscillations. We observe that an oscillation region in the parameter space is between regions admitting steady states that correspond to zero and constant production. Similar behavior is found with the three-protein model where all proteins require the same production time. However, a shift in the protein production rates peaks occurs for low available resource suggesting that our model captures the shared resource pool dynamics. Copyright © 2023, The Authors. All rights reserved.

关键词： Boundary value problems

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