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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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Enhancing End-of-Line Defect Classifications and Evaluating Early Testability for Inline Test Stands Using NVH Measurements

Enhancing End-of-Line Defect Classifications and Evaluating ...

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International Electric Drives Production Conference (EDPC)

作者： Jakob Bonart Philipp Hümmer Welf-Guntram Drossel Technology development E-Drive BMW AG MunichGermany Fraunhofer Institute for Machine Tools and Forming Technology Chemnitz Germany

ISBN: (纸本)9781665418102

Production lines for electric drives consist of successive assembly steps. The highly integrated topology of the unit can lead to complex faults caused by poor components or incorrect assembly. To minimize the added value of a bad motor, a noise-vibration-harshness (NVH) measurement is performed on an in-line test bench (IL). Following the IL, other components (gearbox, inverter, …) are assembled, resulting in a finished electric drive unit. The final state is again tested by a NVH measurement on an end-of-line (EOL) test bench. A novel approach is presented that combines the results of both test benches into an overall picture, thus creating a contextual environment for the EOL. Depending on the interaction of the two test benches, different implications are derived. An identified defect on the EOL can be further classified by deviations already present in the IL test. Deviations that are not present on the IL also indicate processes between the two test stands and thus increase the ability to correctly classify defects on the EOL. If deviations are present on the IL, an indicator of significant testability is derived. This can be further used to accurately detect defects that were previously only detected on the EOL.

关键词： Vibrations Location awareness Electric variables measurement Production Manuals Vibration measurement Topology

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

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Procedia CIRP 2021年 104卷 1482-1487页

作者： Sebastian Kriechenbauer Peter Müller Reinhard Mauermann Welf-Guntram Drossel Fraunhofer Institute for Machine Tools and Forming Technology IWU Nöthnitzer Straße 44 01187 Dresden Germany Technische Universität Chemnitz Institut für Werkzeugmaschinen und Produktionsprozesse Professur Adaptronik und Funktionsleichtbau 09107 Chemnitz 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.

关键词： deep-drawing evolutionary process optimization servo screw press machine learning cushion-ram-pulsation variable stroke

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Modular instrument for the minimally invasive surgery with SMA actuation and control

Modular instrument for the minimally invasive surgery with S...

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International Conference on Shape Memory and Superelastic Technologies 2019, SMST 2019

作者： Braun, Dennis Weik, David Eisner, Sophia Werner, Michael Fraunhofer Institute for Machine Tools and Forming Technology IWU Department of Medical Engineering Dresden Germany

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Does the wall sound different? Variable acoustics in rehearsal rooms using small resonator structures in an acoustic panel 50

Does the wall sound different? Variable acoustics in rehears...

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

作者： Knöfel, Björn van Brummelen, Paula Behrens, Tobias Schirmer, Hartmut Fraunhofer Institute for Machine Tools and Forming Technology IWU Nöthnitzer Straße 44 Dresden01187 Germany Weißensee Kunsthochschule Berlin Bühringstraße 20 Berlin13086 Germany ADA-Acoustics and Media Consultants GmbH Arkonastr. 45-49 Berlin13189 Germany SCHIRMER GmbH Beratende Ingenieure Radeburger Straße 124 Dresden01109 Germany

ISBN: (纸本)9781732598652

As the name already states, multipurpose rooms are often used from various people for different intentions like meetings or musical practicing. One example are musical rehearsal rooms, where the acoustic specifications have to meet the requirements of musicians playing different instrument groups. To meet the desire for variable acoustics in a rehearsal room, musicians often like to adjust the room to there personal preferences, what is mostly done by adjusting the frequency dependent room decay curve (T60). Hence, a variable acoustic panel has been developed which consists of several small adjustable resonator structures. In a closed state, the structure acts like a resonator. Although Helmholtz resonators are mostly used at low frequencies, the acoustic panel can address acoustic resonance absorption in the mid-frequency range between 500 Hz and 1.500 Hz. The paper highlights especially the dimensioning of the resonators and its measurements in an impedance tube, a reverberation cabin and a reverberation room. Finally, the prototype of the acoustic panel has been analysed in different rehearsal rooms where musicians examine the panel and T60 differences between the open and closed state of the panel were measured. © INTER-NOISE 2021 .All right reserved.

关键词： Reverberation

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Unique Device Identification Based Linkage of Hierarchically Accessible Data Domains in Prospective Hospital Data Ecosystems

arXiv

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arXiv 2022年

作者： Kozak, Karol Seidel, André Matvieieva, Nataliia Neupetsch, Constanze Teicher, Uwe Lemme, Gordon Achour, Anas Ben Barth, Martin Ihlenfeldt, Steffen Drossel, Welf-Guntram Technische Universität Dresden Center for Evidence-Based Healthcare Dresden01307 Germany Fraunhofer Institute for Machine Tools Forming Technology IWU Dresden01187 Germany Technische Universität Dresden Dresden01069 Germany Fraunhofer Institute for Ceramic Technologies and Systems Maria-Reiche-Str. 2 Dresden01069 Germany Technische Universität Chemnitz ChemnitzD-09107 Germany

The electronic health record (EHR) targets the systematized collection of patient-specific electronically-stored health data. Currently the EHR is an evolving concept driven by ongoing technical developments and open or unclear legal issues concerning used medical technologies, data integration from other domains and unclear access roles. This paper addresses cross-domain data integration, data fusion and access control using the specific example of a Unique Device Identification (UDI) expanded hip implant. In fact, the integration of technical focus data into the hospital information system (HIS) is discussed and presented based on surgically relevant information. Moreover, the acquisition of social focus databased on mHealth is approached, which also covers data integration and networking with therapeutic intervention or acute diagnostics data. Data integration from heterogeneous domains is covered while using a data ecosystem with hierarchical access based on a shell embedded role model, which includes staggered access scenarios. © 2022, CC BY.

关键词： Cyber Physical System

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Reaming of carbon fibre reinforced plastics: Influence of tool geometry on process forces and tool wear

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Procedia CIRP 2021年 99卷 409-413页

作者： Konstantin Sauer Matthias Putz Chemnitz University of Technology Reichenhainer Strasse 70 09126 Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology Reichenhainer Strasse 88 09126 Chemnitz Germany

Due to the high abrasive wear and the tendency to workpiece damages, the manufacturing of high-quality bores in carbon fibre reinforced plastics (CFRP) is still one of the major goals in tool development. In this work, reaming tests are performed on CFRP in order to characterise the relationship between tool geometry, process forces and tool wear. After a preliminary investigation of a taper reamer, diverse carbide tools have been tested which exhibit different values of rake and clearance angle. The forces measurement took place using a rotating dynamometer, while the evaluation of the tool wear has been realised by microscopic images via structured light projection. Different forms of wear appear, while hardly any differences in the force curves can be detected when applying different angles of the cutting wedge.

关键词： Drilling Reaming CFRP Bore quality Tool wear

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

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Procedia CIRP 2022年 108卷 489-494页

作者： Jonas Heinzel Rahel Jedamski Maximilian Rößler Bernhard Karpuschewski Jérémy Epp Martin Dix MAPEX Center for Materials and Processes University of Bremen Bibliothekstr. 1 28359 Bremen Leibniz Institute for Materials Engineering IWT Badgasteiner Str. 3 Bremen 28359 Germany Fraunhofer Institute for Machine Tools and Forming Technology Reichenhainer Straße 88 09126 Chemnitz 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.

关键词： grinding burn detection surface integrity process control

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Impact of shape irregularity in medial sphenoid wing meningiomas on postoperative cranial nerve functioning, proliferation, and progression-free survival

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Brain and Spine 2023年 3卷 101857-101857页

作者： Wach, Johannes Block, Greta-Aimée Vychopen, Martin Grunert, Ronny Güresir, Erdem Arlt, Felix University Hospital Leipzig Germany Fraunhofer Institute for Machine Tools and Forming Technology Zittau Germany

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