检索结果-内蒙古大学图书馆

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

作者： Christian Kollatsch Marco Schumann Philipp Klimant Mario Lorenz Institute for Machine Tools and Production Processes Chemnitz University of Technology IWU Fraunhofer Institute for Machine Tools and Forming Technology Department of Orthopedics Trauma and Plastic Surgery

ISBN: (纸本)9781538614549

Connecting third party systems like machine controls and product data management systems with Augmented Reality (AR) support applications is crucial for their industrial success. We present a marketing use case of a Virtual Press demonstrator where the connection to a machine control was successfully implemented. The realization of this application utilized the AR framework ARViewer that is introduced in this paper. Subsequent, an outlook is given how this framework can be extended using three examples of AR maintenance applications.

关键词： Augmented reality

来源：评论

学校读者我要写书评

暂无评论

Evaluation of Shape Memory Alloy Bulk Actuators for Wear Compensation in Ball Screw Drives

引用

IFAC-PapersOnLine 2016年第21期49卷 88-94页

作者： Drossel, Welf-Guntram Junker, Tom Bucht, André y de Sosa, Iñaki Navarro Pagel, Kenny Fraunhofer Institute for Machine Tools and Forming Technology IWU Department Mechatronics Dresden01187 Germany Technische Universität Chemnitz Department of Machine Tools and Forming Technology Chemnitz09107 Germany

In this paper we present an approach to reset a preload loss in ball screw drives which enables to compensate losses of positioning accuracy due to wear over lifetime. The main purposes are reduced maintenance, longer service life and improved workpiece quality by regenerating the desired preload conditions which leads to a higher profit for manufacturers. For this purpose, a novel shape memory alloy (SMA) bulk actuator module for ball screw drives is designed. The device is developed to be implemented in standard drives without major changes in component design. It is installed between flanged nut and counter nut and replaces a spacer usually needed to set a defined preload. To achieve the required actuator performance SMA bulk actuators are investigated in detail. This covers their basic design and activation concepts. A prototype is designed and experimentally investigated; measurements show the proof of the concept. © 2016

关键词： Ball screws Drives machine tools Rigidity Shape memory effect Actuator modules Actuator performance Ball screw drives Basic designs Component design Positioning accuracy Shape memory alloys(SMA) Wear compensation

来源：评论

学校读者我要写书评

暂无评论

Composite sandwich with aluminum foam core and adhesive bonded carbon fiber reinforced thermoplastic cover layer

Composite sandwich with aluminum foam core and adhesive bond...

引用

International Symposium on Material Science and Engineering, ISMSE 2017

作者： Hackert, Alexander Drebenstedt, Claudia Timmel, Tristan Osiecki, Tomasz Kroll, Lothar Technische Universität Chemnitz Department of Lightweight Structures and Polymer Technology Institute of Lightweight Structures Faculty of Mechanical Engineering Chemnitz09107 Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Mechatronics and Lightweight Structures Reichenhainer Straße 88 Chemnitz09126 Germany

ISBN: (纸本)9783035711165

The combination of metals and fiber reinforced plastics is also known as hybrid metal composites. They offer the fusion of the good static mechanical properties of the fiber reinforced plastics and the good dynamic mechanical properties of the metal. For that reason, parts made of hybrid metal composites are predestined for the use as load relevant parts. The purpose of this study was to develop new technologies for semi finished hybrid metal composite materials. Thermoplastic Fiber-Reinforced Composites (TP-FRC) were arranged with new, isotropic, closed pore Aluminum Foam (AF) structures to an Extrinsically Combined Composite Sandwich (ECCS) by adhesive bonding. They form the basis for novel weight-optimized as well as cost-effective applications. The entire manufacturing process for the continuous semi-finished product was examined and verified according DIN EN 2563. This was done with regard to subsequent characterization by the specific bending modulus and specific bending stiffness. The examinations show a high bending stiffness and high strength structures combined with excellent damping properties at high damage tolerances. These are the most requested in automotive applications. © 2017 Trans Tech Publications, Switzerland.

关键词： Carbon fiber reinforced plastics

来源：评论

学校读者我要写书评

暂无评论

Numerical simulation of thermal supported self-pierce riveting of an ultra high-strength aluminium alloy

引用

Journal of Physics: Conference Series 2018年第1期1063卷

作者： M Jäckel S Maul C Kraus W-G Drossel Fraunhofer Institute for Machine Tools and Forming Technology IWU Nöthnitzer Str. 44 01187 Dresden Germany

This paper will describe the experimental and numerical analysis of the thermal supported self-pierce riveting process of EN AW-6016 T4 into EN AW-7075 T6. In this regard, the experimental process analysis, the develo...

关键词：

来源：评论

学校读者我要写书评

暂无评论

Highly elastic strain gauges based on shape memory alloys for monitoring of fibre reinforced plastics 21st

Highly elastic strain gauges based on shape memory alloys fo...

引用

21st Symposium on Composites, 2017

作者： Mäder, Thomas De Sosa, Iñaki Navarro Y. Senf, Björn Wolf, Peter Hamm, Martin Zoch, Martin Drossel, Welf-Guntram Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 Chemnitz09126 Germany Prof. for Adaptronics and Lightweight Design Technische Universität Chemnitz Chemnitz09107 Germany FiberCheck GmbH Technologie-Campus 1 Chemnitz09126 Germany

ISBN: (纸本)9783035711981

Conventional strain gauges made of constantan or CuCr for instance have a low value for structural health monitoring issues in plastic composites. These strain sensor materials exhibit small elastic regions and show fatigue when dynamically loaded with strain levels over 0.3 percent. For this reason, these sensors would break or fail before the composite life-time and thus cannot be integrated into this kind of composite materials. Pseudoelastic thermal shape memory alloys are therefore used as strain sensors and integrated into composites in order to allow piezoresistive strain measurement and structural health monitoring in such materials. Thermal treatments are used to create sensor structures out of shape memory alloy wires. Pseudoelastic shape memory wires can be strained up to 8 percent repeatedly. Their gauge factor is higher than 5. Shape memory strain sensors are successfully embedded into glass fibre reinforced plastics and show a significant and reproducible resistance change when the composite is strained. The dynamic strength is magnificently higher compared to conventional strain gauges. Shape memory strain sensors are an efficient alternative to fiber-bragg-grating sensors and can potentially be used for strain measurements in different plastics and textile materials. Shape memory sensor structures can be embedded or applied and are good candidates for structural characterisation and monitoring applications. © 2017 Trans Tech Publications, Switzerland.

关键词： Strain gages

来源：评论

学校读者我要写书评

暂无评论

Acoustical optimization of a train gearbox based on overall system simulation 45

Acoustical optimization of a train gearbox based on overall ...

引用

45th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future, INTER-NOISE 2016

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

The present article deals with the simulative representation and optimization of acoustical properties of a train gearbox with one helical gear stage. At first, a dynamic model of the initial gearbox based on manufacturer construction parameters was built up. Based on this model, the gear mesh excitation as a main source of structure-borne sound has been calculated. Within the simulation model relevant influences on gear mesh excitation e.g. housing and shaft deformations or bearing stiffnesses have been considered by including flexible structures. By reference to these simulation results, the first optimization step was to change gear micro geometry to reduce system excitation. Based on analysis of system dynamics, as well as the calculation of averaged surface velocities, critical rotational speeds have been identified for a given input torque. For these critical rotational speeds, interface parameters, which are necessary for the following numerical sound radiation simulation, have been determined. On the basis of the simulated mode shapes and operational deflection shapes, a structural optimization of the gearbox housing was performed by considering installation space and mass specifications. The acoustical characterization of different optimization variants has been realized by comparing the emitted sound power levels determined by numerical simulation. © 2016, German Acoustical Society (DEGA). All rights reserved.

关键词： Flexible structures

来源：评论

学校读者我要写书评

暂无评论

Evaluation of Measures for Thermo-sensitive Design and Operating of machine Tool Structures

引用

Procedia CIRP 2017年 60卷 14-19页

作者： Joachim Regel Volker Wittstock Matthias Putz Institute for Machine Tools and Production Processes Technische Universität Chemnitz Reichenhainer Str. 70 09126 Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 09126 Chemnitz Germany

The variance-based sensitivity analysis can be used as a statistical procedure to evaluate different individual measures to influence the thermal behaviour of machine tools. It provides specific ratios for parameters affecting the variance of the output parameters that are not comparable in any other way. This method is implemented by means of large samples used in a simulation model which reduces computing time and is oriented towards physical objects. Furthermore, conditional and total variances are estimated. The article describes the principles of modelling with discrete elements to integrate all variants into one simulation model, the definition of input and output parameters and sample generation considering the parameter-specific distribution functions and parameter dependences. To evaluate the applied measures, temperatures, temperature differences, heat flow and time required until achieving thermal equilibrium are examined as such, or in relation to the deployed energy. The implementation is demonstrated by means of two examples. One refers to the design, and the other one deals with the operation phase of existing machine tools.

关键词： machine tool sensitivity analysis thermal measures design phase adaptive cooling

来源：评论

学校读者我要写书评

暂无评论

Train Front Module in Aluminium-foam-sandwich Design

引用

Lightweight Design worldwide 2017年第6期10卷 12-17页

作者： Susi Rybandt Carsten Lies Thomas Hipke Institut für Werkzeugmaschinen und Produktionsprozesse at TU Chemnitz Chemnitz Germany Functional Integration/Lightweight Design at the Fraunhofer Institute for Machine Tools and Forming Technology (IWU) Chemnitz Germany

来源：评论

学校读者我要写书评

暂无评论

Consistent Simulation Strategy for Heat Sources and Fluxes in Milling

引用

Procedia CIRP 2017年 62卷 239-244页

作者： Matthias Putz Christian Oppermann Ulrich Semmler Michael Bräunig Umut Karagüzel Fraunhofer Institute for Machine Tools and Forming Technology IWU 09126 Chemnitz Germany Chemnitz University of Technology 09010 Chemnitz Germany Mechanical Engineering Department Istanbul Technical University 34437 Istanbul Turkey

The paper presents a consistent numerical simulation method for calculation of heat sources and heat fluxes in milling processes. First of all, by means of finite element simulation of the interrupted chip formation process the cutting heat source is calculated. Next, the non-steady-state heat fluxes into the workpiece, the chips and the tool are computed numerically. The computed fluxes serve as boundary conditions for thermo-mechanical FE workpiece and tool models. The numerical models are fitted and verified by experiments of S235 steel. The simulations show a good match with the force and temperature measurements of the cutting processes.

关键词： Milling Finite element method Simulation Experimentation

来源：评论

学校读者我要写书评

暂无评论

Heat Sources and Fluxes in Milling: Comparison of Numerical, Analytical and Experimental Results

引用

Procedia CIRP 2017年 58卷 97-103页

作者： Matthias Putz Christian Oppermann Michael Bräunig Umut Karagüzel Fraunhofer-Institute for Machine Tools and Forming Technology IWU 09126 Chemnitz Germany Chemnitz University of Technology 09010 Chemnitz Germany Mechanical Engineering Department Istanbul Technical University 34437 Istanbul Turkey

The paper describes the comparison of numerical solution, analytical approach and experimental results calculating heat sources and heat fluxes in a milling process with the aim of the calculation of the temperature distribution. Analytical solutions for standard geometries are superposed in order to represent the tool best possible. Exposed with the heat sources calculated by finite element simulation of the interrupted chip formation process the solution of these analytical representation is compared with numerical ones. These have been investigated in previous research on a consistent numerical simulation method for calculation of heat sources and fluxes in milling. Both models are fitted and verified by cutting experiments.

关键词： Finite element Method Simulation Analytical solution Experimentation

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：