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27th International Congress on Sound and Vibration, ICSV 2021

作者： Melnikov, Anton Michael, Stolz Wall, Franziska Kaiser, Bert Mrosk, Andreas Schuffenhauer, David Monsalve, Jorge Sergiu, Langa Schenk, Hermann A.G. Ehrig, Lutz Conrad, Holger Ahnert, Maik Schenk, Harald Fraunhofer Institute for Photonic Microsystems IPMS Dresden Germany Arioso Systems GmbH Dresden Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Dresden Germany Brandenburg Technical University Cottbus-Senftenberg BTU Micro and Nano Systems Cottbus Germany

ISBN: (纸本)9788378807995

A recently introduced novel actuator class, called the nano electrostatic drive (NED), uses the electrostatic actuation to generate large deflections of elastic structures. The NED principle was recently successfully applied to create an all silicon loudspeaker based on micro-electro-mechanical systems (MEMS) technology. Such MEMS audio transducers cover the full frequency range required for high fidelity audio applications. High fidelity audio reproduction also demands minimizing harmonic distortions substantially below 1 %. A major advance in this direction is combining the NED principle with a push-pull driving scheme in a balanced design (BNED), eliminating even harmonics. The practical implementation of a BNED design is however demanding. The nature of the Coulomb force, the impact of stress stiffening and the large deformations required for generating high sound pressures, to name a few aspects, potentially contribute to the harmonic distortion and therefore need advanced experimental methods and simulation models to allow for an apt design. In this paper, we report first results of an experimental technique, combining an optical microscope with a high-speed camera, capable of analyzing the local details of the actuator movement at frame rates of 50,000 frames per second. Dynamic features, such as the excitation of harmonics and intermodulations become clearly visible. These experimental results are then used to scrutinize and refine our multi physics FEM simulations. © "Advances in Acoustics, Noise and Vibration - 2021" Proceedings of the 27th International Congress on Sound and Vibration, ICSV 2021. All rights reserved.

关键词： Loudspeakers

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Evaluation of augmented reality supported approaches for product design and production processes 8

Evaluation of augmented reality supported approaches for pro...

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8th CIRP Conference of Assembly technology and Systems, CATS 2020

作者： Schumann, Marco Fuchs, Christian Kollatsch, Christian Klimant, Philipp Institute for Machine Tools and Production Processes Chemnitz University of Technology Reichenhainer Straße 70 Chemnitz09126 Germany Fraunhofer Institute for Machine Tools and Forming Technology Reichenhainer Straße 88 Chemnitz09126 Germany

Augmented Reality (AR) has been a focus of research in the field of production for many years with the goal to improve e.g. monitoring and maintenance processes. Although the benefits have been well researched, the AR technology has not been widespread yet in the industry. This article discusses reasons why existing approaches have not become established outside the research context. Following this, solutions are examined for three identified problematic areas. First, this article presents a theoretical method to create use cases for AR applications in the product design process based on the Double Diamond design process model. The second main part discusses which device properties are relevant for a production environment. A catalogue of criteria is presented, weighting properties according to their importance. Third, a discussion is described regarding data integration concepts, problems and solutions for AR design and production use cases. © 2020 The Author(s).

关键词： Augmented reality

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Cutting parameter study of CFRP machining by turning and turn-milling 13

Cutting parameter study of CFRP machining by turning and tur...

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

作者： Sauer, Konstantin Hertel, Matthias Fickert, Sandro Witt, Marco Putz, Matthias Chemnitz University of Technology Institute for Machine Tools and Production Processes Reichenhainer Str. 70 Chemnitz09126 Germany Fraunhofer Institute for Machine Tools and Forming Technology Reichenhainer Str. 88 Chemnitz09126 Germany

The use of carbon fibre reinforced plastic (CFRP) structures in rotationally symmetrical components opens up a new field of lightweight construction with great potential for reducing the mass of moving components. Due to the material anisotropy, the machining of these structures can cause component damages. In this paper, the machining results of CFRP shafts conducted by turning and orthogonal turn-milling are presented. The characteristics of the applied processes are evaluated concerning the achievable shape and surface quality of the workpiece. Furthermore, the possibilities for the machining of fits on CFRP shafts are discussed. © 2020 The Authors.

关键词： Turning

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Holistic animation and functional solution for digital manikins in context of virtual assembly simulations 8

Holistic animation and functional solution for digital manik...

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8th CIRP Conference of Assembly technology and Systems, CATS 2020

作者： Fuchs, Christian Allmacher, Christoph Klimant, Philipp Putz, Matthias Institute for Machine Tools and Production Processes Chemnitz University of Technology Reichenhainer Straße 70 Chemnitz09126 Germany Fraunhofer Institute for Machine Tools and Forming Technology Reichenhainer Straße 88 Chemnitz09126 Germany

Assembly simulations in virtual reality were used increasingly in recent years. Even though a multitude of solutions exists in the commercial market, research is focusing on improving soft factors like usability and financial accessibility. Therefore, this paper proposes a holistic solution for animation and integration of functionality of a digital manikin in Unity. The solution is using Unity's integrated inverse kinematics system and physics engine. The result is a fully animated human manikin based on the tracking data of a head-mounted display and its two controllers, which is extrapolating motion data for untracked body parts. Furthermore, the solution enables the user to manipulate objects and explore the virtual environment. The solution is validated in comparison to established motion capture methods using joint error analysis. © 2020 The Author(s).

关键词： Inverse kinematics

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Automated porosity assessment of parts produced by Laser Powder Bed Fusion using Convolutional Neural Networks

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Procedia CIRP 2021年 104卷 1434-1439页

作者： Jan Klein Martin Jaretzki Michael Schwarzenberger Steffen Ihlenfeldt Welf-Guntram Drossel Technische Universität Dresden Chair of Machine Tools Development and Adaptive Controls 01069 Dresden Fraunhofer Institute for Machine Tools and Forming Technology (IWU) Nöthnitzer Str. 44 01187 Dresden Germany

Laser Powder Bed Fusion (LPBF) is especially interesting for applications in industries with high quality requirements. There are different expensive and time-consuming strategies for quality assurance. A cheaper and faster approach is to analyze the data acquired during fabrication. In this work Convolutional Neural Networks (CNN) are investigated as a tool for data analysis of meltpool monitoring data. The goal is to automatically distinguish between porous and non-porous part regions. Therefore, the training data is categorized based on CT-scans of the test specimens. For increased interpretability of the results, Gradient-Weighted Class Activation Maps (Grad-CAM) are used.

关键词： Additive Manufacturing Laser Beam Melting LPBF Process Monitoring Quality Assessment Porosity In-process sensing Melt pool monitoring CNN Neural Networks

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Characterization of the high-pressure suspension jet for efficient cutting and abrasive circularity

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CIRP Annals 2025年

作者： Morczinek, Florian Dix, Martin Wertheim, Rafael Institute for Machine Tools and Production Processes Technical University of Chemnitz Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology Chemnitz Germany Braude College of Engineering Karmiel Israel

To optimize the workpiece removal process and maximize the fraction of reusable abrasive particles, it is necessary to ascertain the characteristics of the high-pressure suspension jet process, including the kinetic energy of the particles in the jet. In this study, the particle velocity and the change in their size were measured and analyzed. It was found that due to breakage the average particle size decreases by up to 35 % during the acceleration process in the nozzle. The results showed that the particle size has insignificant influence on particle velocity, while the kinetic energy of an average particle decreased by up to 72 %. © 2025 The Authors

关键词： Kinetic energy

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Filling the Semantics Gap in Industrial Communication: Middleware+ for an Internet of Production

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IFAC-PapersOnLine 2021年第1期54卷 432-437页

作者： Raphael Kiesel Arno Weiss Robert H. Schmitt WZL | RWTH Aachen University Aachen Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz Germany Fraunhofer Institute for Production Technology IPT Aachen Germany

To enable interoperable communication between enterprise software and industrial assets, the Internet of Production reference model suggests a single platform for routing and data access. This Middleware+ must not only act as a central message broker but also meet the challenge of incompatible data models. However, its exact capabilities remain blurred. We first compile relevant technologies and standards to integrate. Definition of requirements and a software architecture proposal follow. Considering the heterogeneous degree of connectivity within producing companies, we then sketch the path to implementation based on maturity levels. The result is a distributed information system architecture ensuring the rigorous use of semantic information models throughout the entire lifecycle of a product.

关键词： Internet of things flexible reconfigurable manufacturing systems modeling of manufacturing operations enterprise integration systems interoperability protocols information communication

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Combined laser hardening and laser surface texturing forming tool 1.2379 11

Combined laser hardening and laser surface texturing forming...

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11th CIRP Conference on Photonic Technologies, LANE 2020

作者： Aragaw, Endalkachew Mekonnen Gärtner, Eric Schubert, Andreas Institute for Machine Tools and Production Processes Chemnitz University of Technology Reichenhainer Str. 70 09107 Germany Fraunhofer Inistitute for Machine tools and Forming Technology IWU Reichenhainer Str. 88 09126 Germany

This paper deals with the tribological performance of forming tool steel 1.2379. Laser hardening and Laser surface texturing are proposed as processes to improve this tribological performance. Hardening influences the surface hardness and wear resistance. While considering the parameter and the specific material, the correlation between heating power and material property is first modelled using FEM of the heat transfer. Based on the modelling result, the realization is performed by nanosecond laser and analyzed by SEM and by comparing the micro - hardness comparison with a reference value. Then textures are integrated into the hardened surface by picosecond laser ablation while focusing on its suitability for smooth dimples and on the examination by pin-on-disk tests for the effect of incorporating textures on the friction performance. Lower friction coefficients between tool and workpiece improve tool durability and product quality as well. © 2020 The Authors. Published by Elsevier B.V.

关键词： Microhardness

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Ethanol Exposure Duration Effects on Soft Tissue Biomechanics

SSRN

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SSRN 2024年

作者： Werner, Michael Drossel, Welf-Guntram Löffler, Sabine Hammer, Niels Fraunhofer Institute for Machine Tools and Forming Technology Dresden Germany Institute of Anatomy University of Leipzig Leipzig Germany Division of Macroscopic and Clinical Anatomy Gottfried Schatz Research Center Medical University of Graz Graz Austria Department of Orthopedic and Trauma Surgery University of Leipzig Leipzig Germany Department of Anatomy University of Otago Dunedin New Zealand

When conducting biomechanical testing or clinical training using embalmed human soft tissues, it is essential to understand their impact on biomechanical properties and their time dependence. Previous studies have investigated this influence, but specific variations over different embalming durations have not been thoroughly addressed to ***-seven human iliotibial band specimens were obtained from nine donors. All specimens were embalmed in ethanol-glycerin for varying durations: one day, eight days, and fourteen days. Prior to the mechanical trials, the specimens underwent osmotic water adjustment, tapering and standardized clamping. Uniaxial tensile tests were conducted to determine elastic modulus, ultimate tensile strength, and ultimate strain. Surface strain measurements were performed using a digital image correlation ***-glycerin embalming of soft tissues significantly affects ultimate strain after one day of submersion time, elastic modulus after eight days, and the ultimate tensile strength after fourteen days. For applications requiring consistent and reliable material properties reflecting a (supra-)vital state, caution is advised against using embalmed tissues even following short submersion durations in ethanol-glycerin. © 2024, The Authors. All rights reserved.

关键词： Tensile strength

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Evolutionary optimization of deep-drawing processes on servo screw presses with freely programmable force and motion functions 54

Evolutionary optimization of deep-drawing processes on servo...

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54th CIRP Conference on Manufacturing Ssystems, CMS 2021

作者： Kriechenbauer, Sebastian Müller, Peter Mauermann, Reinhard Drossel, Welf-Guntram Fraunhofer Institute for Machine Tools and Forming Technology IWU NOthnitzer Straße 44 Dresden01187 Germany Technische Universität Chemnitz Institut für Werkzeugmaschinen und Produktionsprozesse Professur Adaptronik und Funktionsleichtbau Chemnitz09107 Germany

Servo screw presses with freely programmable force and motion functions lead to innovative forming technologies for deep drawing of sheet metals. The advanced application potential of the machine type is mainly based on the accuracy and flexibility. Due to the increase of process parameters in deep-drawing processes with variable force and motion functions, the standards for method planning (consideration of machine properties, parameterization of the movement functions) in comparison to conventional deep-drawing processes increase. The high number of parameters motivates the aim: A systematic design of deep-drawing processes with free force and motion functions on servo presses based on computational science methods. In the context of this publication, the determination of optimal parameters (force and motion functions) for a deep-drawing process with superimposed vibrations on servo screw presses will be investigated. With the help of evolutionary optimization approaches a process-design for a deep-drawing process with superposition of low-frequency oscillations will be carry out. The results of the evolutionary optimization approaches are validated by experiments with cross die part. © 2021 The Author(s).

关键词： Optimization

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