检索结果-内蒙古大学图书馆

The development of a digital twin for machining processes for the application in aerospace industry

Procedia CIRP 2020年 93卷 1399-1404页

作者： Albrecht Hänel Thorben Schnellhardt Eric Wenkler Andreas Nestler Alexander Brosius Christian Corinth Alexander Fay Steffen Ihlenfeldt Institute of Manufacturing Technology Technische Universität Dresden 01062 Dresden Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU 01187 Dresden Germany Institute of Mechatronic Engineering Technische Universität Dresden 01062 Dresden Germany Institute of Automation Technology Helmut Schmidt University 22043 Hamburg Germany

This paper describes a method for creating a digital twin based on planning and process data for machining processes by using the example of components in the aerospace industry. This development is based on an information model that combines the properties and relationships of relevant information and data involved in the manufacturing process. This system integrates mathematical (technical-technological) models and algorithms for the determination of process parameters as well as planning-relevant information from the machining process. The technology of the digital twin makes it possible to recognize problems directly in the machining process, e.g. deviations from the planning specifications and to derive targeted measures for quality assurance and optimization of the machining process.

关键词： digital twin machining process information model process data aerospace

来源：评论

学校读者我要写书评

暂无评论

Implementation of the machine Tool-Specific Current and Voltage Control Characteristics in Multiphysics Simulation of Electrochemical Precision Machining

引用

Procedia CIRP 2019年 82卷 237-242页

作者： Ingo Schaarschmidt Matthias Hackert-Oschätzchen Gunnar Meichsner Mike Zinecker Andreas Schubert Professorship Micromanufacturing Technology Chemnitz University of Technology 09107 Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU 09126 Chemnitz Germany

In this study a multiphysics simulation model of the pulsed electrochemical machining (PECM) with oscillating cathode is shown. The focus of this study is on the implementation of machine tool-specific control characteristics in combination with physical phenomena and material removal. As a result, the implementation of the machine tool control characteristics leads to an increase of simulation accuracy of the multiphysics model. The simulation results are compared with results of previous simulations and experimental investigations.

关键词： Electrochemical machining (ECM) Material removal High strength steel

来源：评论

学校读者我要写书评

暂无评论

Hololens AR - Using Vuforia-Based Marker Tracking Together with Text Recognition in an Assembly Scenario

Hololens AR - Using Vuforia-Based Marker Tracking Together w...

引用

IEEE International Symposium on Mixed and Augmented Reality Workshops (ISMARW)

作者： Sebastian Knopp Philipp Klimant Robert Schaffrath Eric Voigt Rayk Fritzsche Christoph Allmacher Institute for Machine Tools and Production Processes Chemnitz University of Technology Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz University of Technology Chemnitz Germany

ISBN: (纸本)9781728147666

Many real world applications for Microsoft HoloLens*-based applications suffer the problem of reliably recognizing and identifying movable objects within an environment. While the HoloLens is perfectly able to discern already known rooms, it still has troubles with reflecting surfaces or identically shaped objects. Using dedicated recognition libraries for each task poses the issue of shared resource access in the rather controlled HoloLens environment-In this poster we present a solution for scenario with hard to track objects and similarly shaped objects for an electrical cabinet assembly task, where the reflective cabinet is tagged with a marker and the prefabricated cables are differentiated by text-based labels.

关键词： HoloLens AR Vuforia Text recognition Application showcase Printed text recognition Argon Posters Cabinets Cabinet

来源：评论

学校读者我要写书评

暂无评论

Method for Capacity Planning of Changeable Production Systems in the Electric Drives Production

Method for Capacity Planning of Changeable Production System...

引用

International Electric Drives Production Conference (EDPC)

作者： Jens Niemann Andreas Schlegel Matthias Putz BMW AG Munich Germany Machine Tools Production Systems and Machining Fraunhofer-Institute for Machine Tools and Forming Technology IWU Chemnitz Germany

ISBN: (数字)9781728143194

ISBN: (纸本)9781728143200

Market growth and technological uncertainties characterize the electro-mobility. High emission standards, fossil fuel scarcity, environmental protection, and political initiatives promote this development. Besides, factors such as customer behavior, infrastructure, new competitors, and technological developments induce high volatility in forecasted market volumes. Due to these uncertainties, production systems of electrified vehicles require a combination of changeable production systems and flexibility measures. The production capacity of changeable production systems is currently determined by a conventional capacity planning method, which does not integrate the degrees of freedom conferred by changeability. In this publication, we present a new capacity planning method of changeable production systems in electro-mobility. Changeability comprises pre-defined measures that change either the capacity or the technological spectrum of productions by an investment. A total of five changeability drivers exist, thereof we consider scalability and universality. Scalability in this context refers to the technical, local, and personnel possibilities to expand and reduce factory elements and production systems. Universality focuses on technological production properties, in particular, the ability to meet different production and technology requirements. We define specific changeability options for both drivers. Moreover, we integrate these in production capacity planning, which leads to various production configurations. Additionally, we evaluate the monetary impact and the resulting flexibility of each configuration at any time within the observation period using the real options approach. We choose this approach to integrate market uncertainties in the decision- making process. Further, a Monte Carlo simulation validates all configurations showing positive option values, and we determine a final capacity plan. We apply the method to a production system for electric drives

关键词：

来源：评论

学校读者我要写书评

暂无评论

Revisiting machinability assessment: Towards total machining performance

引用

CIRP Annals 2025年

作者： I.S. Jawahir Helmi Attia Martin Dix Hassan Ghadbeigi Zhirong Liao Julius Schoop Alborz Shokrani Institute for Sustainable Manufacturing (ISM) University of Kentucky Lexington KY USA Mechanical Engineering Department McGill University/Aerospace Manufacturing Technology Centre National Research Council Canada Montreal QC Canada Fraunhofer Institute for Machine Tools and Forming Technology IWU University of Technology Chemnitz Chemnitz Germany School of Mechanical Aerospace and Civil Engineering University of Sheffield Sheffield United Kingdom Faculty of Engineering University of Nottingham Nottingham United Kingdom Department of Mechanical Engineering University of Bath Bath United Kingdom

The term “machinability”, introduced over hundred years ago, is vague and cannot fully describe the performance of machining systems. Machinability databases established over many decades are outdated: missing recent advances, e.g., cutting tool grades, geometry, coatings, and cutting fluids effects. This keynote paper summarizes findings of a CIRP-sponsored three-year collaborative study in five interrelated topics. The paper presents a critical review of the state-of-the-art on these topics, the results of two major round robin tests, three industry-based case studies, and a novel predictive system of machining performance, utilizing advanced deep learning methods. Outlook and future directions are also presented.

关键词： Drills

来源：评论

学校读者我要写书评

暂无评论

High-Speed Incremental forming – New Technologies For Flexible Production Of Sheet Metal Parts

引用

Procedia Manufacturing 2019年 27卷 21-26页

作者： M. Linnemann V. Psyk E. Djakow R. Springer W. Homberg D. Landgrebe Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Strasse 88 09126 Chemnitz Germany Paderborn University – Department of Forming and Machining Technology Pohlweg 47-49 33098 Paderborn Germany

High-speed forming technologies have a very high potential for shaping complex parts and constitute a key means of reducing a component’s weight. For many materials they offer advantages such as low tool cost, high tool flexibility and extended forming limits at room temperature,. Hence, stringent emission regulations can be fulfilled and essential resources are saved. The limited forming zone, however, makes it impossible to achieve flexible, cost-efficient production of complex large-surface parts by high-speed forming alone. In order to overcome this problem, this paper suggests two different innovative forming concepts which enhance the pulsed-power-driven, high-speed forming technologies of electrohydraulic forming and electromagnetic forming by applying an incremental strategy. The concept is presented for both technologies, with a description of the different setups required for achieving the incremental movement in the forming sequence, employing guide railsand an industrial robot. Advantages and limits are discussed, and first experimental results prove the feasibility and give an impression of the process potential.

关键词： Incremental Sheet forming Electromagnetic forming Hydroforming

来源：评论

学校读者我要写书评

暂无评论

Kinematics of the Lumbo-Pelvic Complex under Different Loading Conditions

引用

Current Directions in Biomedical Engineering 2019年第1期5卷 347-349页

作者： Weidling, Martin Voigt, Christian Wendler, Toni Heilemann, Martin Werner, Michael Jarvers, Jan-Sven Heyde, Christoph-E. Center for Research on Musculoskeletal Systems (ZESBO) Faculty of Medicine University of Leipzig Semmelweisstrasse 14 Leipzig Germany Center for Research on Musculoskeletal Systems (ZESBO) Faculty of Medicine University of Leipzig Leipzig Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Dresden Germany Department of Orthopaedic Trauma and Plastic Surgery University Hospital Leipzig Leipzig Germany

The lumbo-pelvic complex is a highly complex structural system. The current investigation aims to identify the kinematics between interacting bone segments under different loading conditions. A specimen of the lumbo-pelvic complex was obtained from a human body donor and tested in a self-developed test rig. The experimental setup was designed to imitate extension, flexion, right and left lateral bending and axial rotation to the left and to the right, respectively. The vertebra L3 was firmly embedded and load was introduced via hip joints. Using a digital image correlation (DIC) system, the 3D motions of 15 markers at different landmarks were measured for each loadcase under cyclic loading. For each loadcase, the kinematics were analyzed in terms of three-dimensional relative movements between L3 and the sacrum. The usefulness of the experimental technique was demonstrated. It may serve for further biomechanical investigations of relative motion of sacroiliac and vertebral joints and deformation of bony structures. © 2019 by Walter de Gruyter Berlin/Boston.

关键词： Kinematics

来源：评论

学校读者我要写书评

暂无评论

Tool System for UV induced micro moulding of biomedical disposables 18

Tool System for UV induced micro moulding of biomedical disp...

引用

18th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2018

作者： Edelmann, J. Gärtner, E. Eckert, U. Griebel, J. Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz Germany Leibnitz IOM Leipzig Germany

ISBN: (纸本)9780995775121

A new approach for the generation of double-sided microstructured polymer films is presented based on injection-molding of urethane- and epoxy-based acrylates that are polymerized by irradiation with ultraviolet light (395 nm). Compared to hot embossing, this offers not only working under ambient conditions, but also a reduction of cycle time as well as flexibility regarding adjustment of the mechanical and/or chemical properties of the resulting polyacrylate film. A setup, consisting of the mold with the microstructured insert and two LED lamps emitting UV-light moved by a controllable stepper motor and a computer-based controller, was installed and successfully used for the fabrication of double-sided microstructured polyacrylate films. Therefore a new and innovative tool system for 2-component UV induced micro moulding of biomedical disposables was developed. The geometrical dimensions of the microstructures (e.g. fins, channels, sharp edges and slopes) require different technologies to machine the tool inserts. Therefore micromilling and μ-laserablation technologies were used in combination attached by laser polishing operations in special areas. A highly precise, complex designed tool system with mechanically moveable areas is needed to fill the tool with the 2 various chemical compositions. The paper presents the tool concept and explains the investigated surface treatment options. © 2018 CURRAN-CONFERENCE. All rights reserved.

关键词： Micromachining

来源：评论

学校读者我要写书评

暂无评论

Optimizing development time through hybrid commissioning of control software

引用

Procedia CIRP 2019年 79卷 450-455页

作者： Christoph Allmacher Marco Schumann Philipp Klimant Matthias Putz Institute for Machine Tools and Production Processes Chemnitz University of Technology Reichenhainer Str. 70 09126 Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 09126 Chemnitz Germany

In modern intralogistics, automated guided vehicles (AGV) are used to optimize the material flow. To minimize the time to market it is necessary to develop software and hardware simultaneously. Therefor this paper introduces the hybrid-development-and-commissioning method of control software for AGVs. It results in a validated virtual prototype that can be used to verify swarm behavior. The methods procedure is demonstrated for a light detection and ranging sensor. Firstly, the sensor is modelled for software-in-the-loop testing. Gradually switching to the physical AGV prototype, the paper further presents the validation process of the sensor model.

关键词： Virtual reality Simulation Virtual commissioning

来源：评论

学校读者我要写书评

暂无评论

Nondestructive testing of composite fibre materials with hyperspectral imaging : Evaluative studies in the EU H2020 FibreEUse project

arXiv

引用

arXiv 2021年

作者： Yan, Yijun Ren, Jinchang Zhao, Huan Windmill, James F.C. Ijomah, Winifred de Wit, Jesper von Freeden, Justus National Subsea Centre Robert Gordon University Aberdeen United Kingdom Dept. of Electronic and Electrical Engineering University of Strathclyde Glasgow United Kingdom Dept of Design Manufacturing & Engineering Management University of Strathclyde Glasgow United Kingdom INVENT GmbH Christian-Pommer-Straße 47 Braunschweig38112 Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Hermann-Münch-Str. 1 Wolfsburg38440 Germany

Through capturing spectral data from a wide frequency range along with the spatial information, hyperspectral imaging (HSI) can detect minor differences in terms of temperature, moisture and chemical composition. Therefore, HSI has been successfully applied in various applications, including remote sensing for security and defense, precision agriculture for vegetation and crop monitoring, food/drink, and pharmaceuticals quality control. However, for condition monitoring and damage detection in carbon fibre reinforced polymer (CFRP), the use of HSI is a relatively untouched area, as existing non-destructive testing (NDT) techniques focus mainly on delivering information about physical integrity of structures but not on material composition. To this end, HSI can provide a unique way to tackle this challenge. In this paper, with the use of a near-infrared HSI camera, applications of HSI for the non-destructive inspection of CFRP products are introduced, taking the EU H2020 FibreEUse project as the background. Technical challenges and solutions on three case studies are presented in detail, including adhesive residues detection, surface damage detection and Cobot based automated inspection. Experimental results have fully demonstrated the great potential of HSI and related vision techniques for NDT of CFRP, especially the potential to satisfy the industrial manufacturing environment. © 2021, CC BY.

关键词： Nondestructive examination

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：