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Mathematical Model of One and Two-Step Methods Calculation of Thermal Fields and Stress-Strain State of Multilayer Cylindrical Constructions

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Materials Today: Proceedings 2019年 11卷 494-503页

作者： Denis Elovenko Andreas Hirsch Verena Kräusel Department of Design and Standardization in Mechanical Engineering Irkutsk National Research Technical University 83 Lermontov street 664074 Irkutsk Russian Federation Professorship Machine Tools and Forming Technology Technische Universität Chemnitz Reichenhainer Str. 70 09107 Chemnitz Germany Professorship Forming and Joining Technische Universität Chemnitz Reichenhainer Str. 70 09107 Chemnitz Germany

Two-step and one-step methods for calculating thermal fields and stress-strain state of multilayer cylindrical constructions (parts of vessel bodies or reactors) have been developed to ensure their functioning under the conditions of high internal pressure and temperature. The efficiency of this algorithms by a simple example of the contact interaction of two cylinders of equal rigidity (α = 0,5) and thermal conductivity in two cylinders in contact heat exchange with thermal conductivity of similar value (α = 0,5) are shown. Two-step method implements the alternate solution step by step of applying kinematic and force tasks for solving the problem of static contact and the tasks of heat transfer and heat field for solving the thermal problem. One-step method realizes the solution of either the power problem on basis of the determined the error resulting from the addressing the kinematic problem, as it is determined in the previous step, or the kinematic problem on the basis of the specified error stemming from the addressing the force problem, which is also defined in the previous step for solve the static contact problem. Also, one-step method realizes the solution applied to the heat transfer problem based on the specified value of the error deriving from the initial addressing the said problem which is determined in the previous step.

关键词： stress state numeral method autoclave stress contact iteration

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Ontology-based microservices architecture for industrial assistant systems 12

Ontology-based microservices architecture for industrial ass...

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Smart Systems Integration 2018 - 12th International Conference and Exhibition on Integration Issues of Miniaturized Systems

作者： Singer, Adrian Wenzel, Ken Müller, Jan Langer, Tino Putz, Matthias Digitalization in Production Germany Department Digitalization in Production Germany Automation and Monitoring Germany Head of Division Smart Factory - Digitalization and Automation Germany Institute Scientific Field Machine Tools Production Systems and Machining Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 Chemnitz09126 Germany

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Verification of a novel measuring method for determining pre- and postoperative leg length in the context of total hip arthroplasty: a technical feasibility study

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Journal of Medical Engineering and technology 2018年第8期42卷 588-594页

作者： Schmidt, Michael Prietzel, Torsten Wendler, Toni Möbius, Robert Schleifenbaum, Stefan Hammer, Niels Grunert, Ronny ZESBO - Center for Research on Musculoskeletal Systems University of Leipzig Leipzig Germany Department of Orthopaedic Trauma and Plastic Surgery University of Leipzig Leipzig Germany Department of Orthopaedic and Trauma Surgery HELIOS Clinic Blankenhain Blankenhain Germany Department of Anatomy University of Otago Dunedin New Zealand Fraunhofer Institute for Machine Tools and Forming Technology Fraunhofer IWU Dresden Germany

Following total hip arthroplasty (THA), leg length can easily be modified, for example by different-sized endoprosthetic components. Currently, precise reconstruction depends mainly on the assessment of the surgeon. The aim of this study was to determine the accuracy of a new optical measuring system (OMS) using a novel measuring method capable of determining changes in leg length. Measurements with different investigators on an artificial leg and under clinical conditions were carried out. Measurements under clinical conditions were accomplished with a human body donor before and following prosthetic hip implantation. Furthermore, computed tomography (CT) was used to compare the function and the precision of the OMS relating to established measuring methods. The following results were achieved. The overall mean result of preoperative leg length determination by the OMS was 775.3 ± 5.8 mm (CT: 786.4 mm). The overall mean result of postoperative leg length determination by the OMS was 776.9 ± 10.8 mm (CT: 795.0mm). Measurements carried out showed that the novel measuring method works in principle. However, the viable prototype based on it has a lower accuracy compared to CT-based reference measurements, indicating the necessity of integrating more precise hardware. © 2019, © 2019 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Arthroplasty

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Methodology for the early analysis and evaluation of the resource efficiency of process chains for manufacturing hybrid structures

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Procedia Manufacturing 2019年 33卷 430-437页

作者： C. Symmank J. Boll A. Rautenstrauch A. Graf L. Markov R. Decker A. Schmidt U. Götze B. Awiszus V. Kräusel D. Landgrebe L. Kroll Professorship of Management Accounting and Control Chemnitz University of Technology Thüringer Weg 7 09126 Chemnitz Germany Professorship Virtual Production Engineering Chemnitz University of Technology Reichenhainer Straße 70 09126 Chemnitz Germany Professorship for Forming and Joining Chemnitz University of Technology Reichenhainer Straße 70 09126 Chemnitz Germany Department of Lightweight Structures and Polymer Technology Chemnitz University of Technology Reichenhainer Straße 31/33 09126 Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 09126 Chemnitz Germany

To ensure a successful development of resource-efficient and sustainable technologies, products, and production processes, it is essential to support R&D activities in early design stages. Thus, amongst others an appropriate assessment should be accomplished, which captures the high complexity and interdependencies of process chains, considers the technological feasibility, the energetic and economic benefit as well as the robustness as facets of resource efficiency, and hence, serves as a basis for deriving impulses for R&D activities. A promising evaluation methodology for such assessments is the Multidimensional Evaluation Method for Process Chains of HybrId Structures (MEMPHIS). In this paper, MEMPHIS is outlined and illustrated for an innovative process chain for producing hybrid laminates with sensor functionality. As a result, the paper will contribute to the further development of the methodology, show its applicability, and provide insights into the innovative technology.

关键词： cost effectiveness energy efficiency hybrid assembled composites robustness sustainable manufacturing processes

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Using Industrial Robots as Haptic Devices for VR-Training

Using Industrial Robots as Haptic Devices for VR-Training

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IEEE Annual International Symposium Virtual Reality

作者： Sebastian Knopp Mario Lorenz Luigi Pelliccia Philipp Klimant Institute for Machine Tools and Production Processes University of Technology Chemnitz Department of Orthopedics University Clinics of Leipzig Chemnitz Institute for Machine Tools and Production Processes Chemnitz University of Technology Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz

ISBN: (纸本)9781538633663

Many VR-training application require the integration of haptics, i.e. for surgical training. However, surgical VR-training is still limited to minimal invasive surgeries. For surgeries where high forces occur, like hip replacement, no VR-training applications have been developed. One cause for this is the lack of appropriate haptic devices which can deliver high forces. Novel industrial collaborative robots can provide high forces. Although, they lack control interfaces allowing to use them as haptic devices. We present 4 approaches for using these robots as general, multipurpose haptic input and output devices. The implemented approach was integrated into a VR hip replacement training application. An initial assessment demonstrates the general feasibility of our solution.

关键词： Conferences Virtual reality Three-dimensional displays User interfaces

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Biomechanical validation of additively manufactured artificial femoral bones

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BMC biomedical engineering 2022年第1期4卷 6页

作者： F Metzner C Neupetsch A Carabello M Pietsch T Wendler W-G Drossel ZESBO Centre for Research on Musculoskeletal Systems Leipzig University Semmelweisstraße 14 04103 Leipzig Germany. florian.metzner@medizin.uni-leipzig.de. Department of Orthopaedics Trauma and Plastic Surgery Leipzig University Leipzig Germany. florian.metzner@medizin.uni-leipzig.de. Department of Orthopaedics Trauma and Plastic Surgery Leipzig University Leipzig Germany. Fraunhofer Institute for Machine Tools and Forming Technology Dresden Germany. Professorship of Adaptronics and Lightweight Design Chemnitz Universtiy of Technology Chemnitz Germany. ZESBO Centre for Research on Musculoskeletal Systems Leipzig University Semmelweisstraße 14 04103 Leipzig Germany.

Replicating the mechanical behavior of human bones, especially cancellous bone tissue, is challenging. Typically, conventional bone models primarily consist of polyurethane foam surrounded by a solid shell. Although nearly isotropic foam components have mechanical properties similar to cancellous bone, they do not represent the anisotropy and inhomogeneity of bone architecture. To consider the architecture of bone, models were developed whose core was additively manufactured based on CT data. This core was subsequently coated with glass fiber composite. Specimens consisting of a gyroid-structure were fabricated using fused filament fabrication (FFF) techniques from different materials and various filler levels. Subsequent compression tests showed good accordance between the mechanical behavior of the printed specimens and human bone. The unidirectional fiberglass composite showed higher strength and stiffness than human cortical bone in 3-point bending tests, with comparable material behaviors being observed. During biomechanical investigation of the entire assembly, femoral prosthetic stems were inserted into both artificial and human bones under controlled conditions, while recording occurring forces and strains. All of the artificial prototypes, made of different materials, showed analogous behavior to human bone. In conclusion, it was shown that low-cost FFF technique can be used to generate valid bone models and selectively modify their properties by changing the infill.

关键词： 3D-printing 3d-printing Additive manufacturing Artificial bone Biomechanics Bone model Femoral Femur Hip

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A quasi-online geometric errors compensation method on CNC machine tool

A quasi-online geometric errors compensation method on CNC m...

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MECHATRONIKA International Symposium

作者： Tomas Marek Jan Berthold Michal Holub Joachim Regel Department of Production Machines Brno University of Technology Brno Czech republic Professorship for Machine Tools and Forming Technology Technische Universität Chemnitz Chemnitz Germany

ISBN: (纸本)9781538643648;9788021455429

The design of the quasi-online geometric errors compensation method on CNC machine tool using the Ballbar device is described. Nowadays, control and compensation of CNC machine tools are essential phases of their operation. The control is usually manual; the operator and the measuring apparatus jointly perform the measurement and subsequent machine compensation. The present paper describes the procedure and the experiment designed to assess machine condition under various operating conditions. The principle of performed machine tests is based on circular interpolation in manual regime. Prior to experiments, relevant evaluations are made, and quasi-online compensation is devised. For circularity measurement, the DMU 125 P DuoBlock CNC machining centre was chosen.

关键词： machine tools Measurement uncertainty Loading Machining Sensor systems Shape

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Considering Energy-Related Factors in the Simulation of Logistics Systems

Considering Energy-Related Factors in the Simulation of Logi...

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Simulation Winter Conference

作者： Moritz Poeting Bastian Prell Markus Rabe Tobias Uhlig Sigrid Wenzel Institute of Transport Logistics TU Dortmund University Dortmund GERMANY Department Factory of the Future Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz GERMANY Department IT in Production and Logistics TU Dortmund University Dortmund GERMANY Department of Computer Science Universität der Bundeswehr München Neubiberg GERMANY Department of Organization of Production and Factory Planning University of Kassel Kassel GERMANY

ISBN: (数字)9781728132839

ISBN: (纸本)9781728120522

Traditionally, aspects such as emissions and energy consumption have to be taken into account for environmental and economic reasons when it comes to transport. In other areas of logistics, such as production logistics and intralogistics, the energy aspect is also becoming increasingly important. Existing literature has been recently reviewed in a contribution of the Arbeitsgemeinschaft Simulation (ASIM) to the Winter Simulation Conference 2018 (Uhlig et al. 2018) to develop a map of common approaches and best practices for manufacturing and logistics systems. In the paper presented here, as a complement we are focusing on the application of energy simulation in logistics to give a comprehensive overview and present exemplary case studies. Furthermore, we show a classification of approaches to combine energy aspects with simulation. Finally, we will discuss open questions and future trends in this field of research.

关键词： tools Mathematical model Supply chains Matlab Adaptation models

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Active flow control in wind turbines - Integration technologies and assessment of economic effects 12

Active flow control in wind turbines - Integration technolog...

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Smart Systems Integration 2018 - 12th International Conference and Exhibition on Integration Issues of Miniaturized Systems

作者： Schüller, Martin Lipowski, Mathias Weigel, Perez Symmank, Christina Meynerts, Lilly Walther, Marco Dziuba, Franz Otto, Thomas Götze, Uwe Kroll, Lothar Department Multi Device Integration Fraunhofer Institute for Electronic Nano Systems Chemnitz Germany Management Accounting and Control Chemnitz University of Technology Chemnitz Germany Department of Lightweight Structures and Polymer Technology Chemnitz University of Technology Chemnitz Germany Forschungszentrum Systeme und Technologien für textile Strukturen STEX Fraunhofer Institute for Machine Tools and Forming Technology Chemnitz Germany Center for Micro Technologies Chemnitz University of Technology Chemnitz Germany

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Author Correction: The influence of different sample preparation on mechanical properties of human iliotibial tract

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Scientific reports 2021年第1期11卷 2673页

作者： Benjamin Fischer Sascha Kurz Andreas Höch Stefan Schleifenbaum ZESBO - Center for Research on the Musculoskeletal System Leipzig University Semmelweisstraße 14 04103 Leipzig Germany. Benjamin.fischer@zesbo.de. Department of Orthopedic Trauma and Plastic Surgery Spine Center Leipzig University Leipzig Germany. Benjamin.fischer@zesbo.de. ZESBO - Center for Research on the Musculoskeletal System Leipzig University Semmelweisstraße 14 04103 Leipzig Germany. Department of Orthopedic Trauma and Plastic Surgery Spine Center Leipzig University Leipzig Germany. Fraunhofer Institute for Machine Tools and Forming Technology Chemnitz Germany.

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