检索结果-内蒙古大学图书馆

Application of Substructure Decoupling Techniques to Predict Mobile machine Tool Dynamics: Numerical Investigations

Procedia CIRP 2016年 46卷 537-540页

作者： Mohit Law Hendrik Rentzsch Steffen Ihlenfeldt Matthias Putz Indian Institute of Technology Kanpur India Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz 09126 Germany Institute of Machine Tools and Control Engineering Technische Universität Dresden Germany

In situ machining of large workpieces is made possible by moving mobile machines to workpiece locations. To guide and enhance on site machining performance, dynamics of the assembled system must be predicted beforehand. Beforehand prediction of assembled response requires dynamics of the mobile machine in its free-free configuration be coupled with response of base/workpiece measured at location. Since obtaining the free-free response of the machine is non-trivial, this paper presents a substructure decoupling scheme that instead extracts the machine's response from known dynamics of the machine mounted on a base, and from information of a substructural base system. Simulation driven investigations show the decoupling scheme to be robust even under the vagaries of measurement noise and changes in the residual substructural base system. Extracted dynamics of the machine can be subsequently synthesized with known dynamics of other bases/workpieces for a priori prediction of assembled dynamics to guide first-time-right on site machining.

关键词： Dynamics machine tool Simulation Mobile machine Substructure decoupling

来源：评论

学校读者我要写书评

暂无评论

Energy storage in drive systems of servo presses for reduction of peak power and energy recovery

Energy storage in drive systems of servo presses for reducti...

引用

European Conference on Power Electronics and Applications

作者： Matthias Putz Peter Blau Artem Kolesnikov Mark Richter Alexander Pierer FRAUNHOFER INSTITUTE FOR MACHINE TOOLS AND FORMING TECHNOLOGY

ISBN: (纸本)9781509014101

The development approach for energy storage systems focuses on optimally sized capacitor modules to reduce peak power and to avoid energy recovery of production machines. Using servo presses as an example, the application of two different energy storage systems in the DC link is practically examined. A simulation model in Matlab/Simulink and a test stand of a servo press are proposed for representing the power flows between the mains supply, the electric drives and the storage systems. The description of forming machines and the behaviour of the electric components are used to control the amount of stored energy in a storage system and to influence the process regarding a reduction of peak power.

关键词： Efficiency Energy Storage Supercapacitor Servo-drive Peak Shaving

来源：评论

学校读者我要写书评

暂无评论

Criteria for Energy-efficiency of Technological Processes, Technological machines and Production Engineering

引用

Procedia CIRP 2016年 46卷 340-343页

作者： A.P. Kuznetsov P. Blau H.-J. Koriath M. Richter Moscow State University of Technology “STANKIN” 127055 Moscow Russia Fraunhofer Institute for Machine Tools and Forming Technology IWU 09126 Chemnitz Germany

At present, a large number of methods for processing and forming of parts and products, technological processes and equipment have been created for their implementation. Trends towards improved productivity, accuracy, reliability, flexibility, economy of the technological process, technological machines and machine system demand the development of new methods for the analysis of their effectiveness. A unified approach to the assessment of the effectiveness of processes, equipment and production allows considering them as energy-information model in which there is a transformation of all types and forms of energy, matter and information. This allows considering the concept of “energy efficiency” as the relative coefficient of efficiency of the collection of all kinds of transformative mechanisms and devices. On the basis of the proposed energy-information model is given the generalized method for the evaluation and comparison of the integral energy efficiency of technological processes, technological machines and production engineering. Due to the directive for the ecodesign of energy-related products (2009/125/EC) and economic factors a metal cutting machine tool has been evaluated over its whole life cycle. A methodology of Life Cycle Impact Assessment (LCIA) was used to unfold the main ecological footprint. The energy consumption of the machine tool and in particular its components was measured for the manufacturing of a defined work piece. The results state priority resource saving potentials of the machine tool. Theoretical calculations and experimental evaluation are presented and compared in order to propose methods for industrial applications.

关键词： machine manufacturing process energy-information model energy efficiency criteria

来源：评论

学校读者我要写书评

暂无评论

Towards Agile Engineering of Mechatronic Systems in machinery and Plant Construction

引用

Procedia CIRP 2016年 52卷 68-73页

作者： Thorsten P. Klein Gunther Reinhart Fraunhofer Institute for Machine Tools and Forming Technology (IWU) Project Group Resource-efficient Mechatronic Processing Machines Beim Glaspalast 5 86153 Augsburg Germany www.iwu.fraunhofer.de/rmv

Agile procedures (e.g. Scrum) are commonly used in rapidly changing environments of software engineering. Experts appreciate improvements in interdisciplinary collaboration, lead times and development costs by applying agile techniques as artifacts, meetings, roles and visualisation methods. Up to now, the use of agile procedures is still limited to IT-projects, due to a lack of profound knowledge in transferring agile techniques into interdisciplinary projects. This contribution presents the research work on Agile Engineering, a counterpart of Lean Product Development, by the systematic integration of agile techniques into the development process of mechatronic production systems. Thereto, an introduction and state of the art is given concerning the industry sector of machinery and plant construction as well as agile methodologies. The main focus of the paper is represented by the classification and comparison of Agile Engineering as well as the main features of integrating agile techniques into the mechatronic engineering process. According to the advanced research insights of the last years, Agile Engineering is a new enabler of success for establishing an agile production, providing promising approaches for coping with change and uncertainty efficiently.

关键词： Agility Mechatronics Engineering Process Lean Product Development Scrum

来源：评论

学校读者我要写书评

暂无评论

Effect of the Welding Parameters on the Structural and Mechanical Properties of Aluminium and Copper Sheet Joints by Electromagnetic Pulse Welding

引用

World Journal of Engineering and technology 2016年第4期4卷 538-561页

作者： Irene Kwee Verena Psyk Koen Faes Belgian Welding Institute Zwijnaarde Belgium Fraunhofer Institute for Machine Tools and Forming Technology Fraunhofer Institute Chemnitz Germany

Aluminium-copper hybrid parts, as a substitution to copper parts, result in weight and cost reduction, and are relevant in applications related to the electronic, heating and cooling sector. However, aluminium to copper joined by thermal welding processes presents challenges in terms of achieving good joint quality. This is attributed to their dissimilar mechanical and thermal properties which result in large stress gradients during heating. This study investigated joining of aluminium to copper sheets by electromagnetic pulse welding, which is a solid-state process that uses electromagnetic forces for joining of dissimilar materials. Hybrid sheet welds were obtained for all parameters conditions, selected according to a Taguchi L18 design. The structural and mechanical characteristics were examined and related to the welding parameters by means of a Pareto analysis and response graphs. The welded zone started with a wavy interface with interfacial layers and defects and evolved to a flat interface without interfacial layers. The maximum transferable force depended on the minimum specimen thickness and the strength of the hybrid sheet weld. In case of aluminium sheet thickness reduction, the maximum transferable force was linearly correlated with the aluminium sheet thickness. High quality joints were obtained for no aluminium sheet thickness reduction and for a sheet weld strength which was at least as high as that of the base material. The most effective way to increase the transferable force was to lower the initial gap and to increase the free length, which resulted in no aluminium sheet thickness reduction. Alternatively, the use of a rounded spacer decreased the effect of the aluminium sheet thickness on the transferable force. An increase in weld width was achieved for an increase in capacitor charging energy and gap, whereas an increase in weld length was obtained for a decrease in gap. An increase in weld width did not necessarily result in an increase in t

关键词： Electromagnetic Pulse Sheet Welding Aluminum-to-Copper Welds Dissimilar Metal Welds Transferable Force Interfacial Morphology

来源：评论

学校读者我要写书评

暂无评论

Investigation of the Time-invariance and Causality of a machine Tool for Performing Operational Modal Analysis

引用

Procedia CIRP 2016年 46卷 400-403页

作者： Matthias Putz Volker Wittstock Martin Kolouch Jan Berthold Technische Universität Chemnitz Professorship for Machine Tools and Forming Technology Reichenhainer Str. 70 09126 Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology (IWU) Reichenhainer Str. 88 09126 Chemnitz Germany

The dynamic behaviour of machine tools affects the work-piece quality and productivity. Generally, the difference between the dynamic properties at standstill and during machining is neglected by the commonly applied assessment methods for production systems. Operational modal analysis takes into account these cutting- and operation-dependent influences. However, operation conditions might cause violation of the common measurement assumptions regarding time-invariance and causality. The investigations consider the time-invariance by the measurement of frequency response functions over the working space including the evaluation of mode shapes. The causality is evaluated by dynamic measurements at TCP excited by feed motions.

关键词： machine tool Dynamics Operational modal analysis

来源：评论

学校读者我要写书评

暂无评论

Waste Reduction by Product-Quality Based Scheduling in Food Processing

引用

Procedia CIRP 2016年 40卷 584-589页

作者： Marcel Wagner Stefan Kaluschke Fabian Keller Gunther Reinhart Fraunhofer Institute for Machine Tools and Forming Technology Beim Glaspalast 5 86153 Augsburg Germany

Related to resource efficiency waste reduction is the crucial point in the processing of food. As shown in different Food Waste Studies the amount of waste in food processing is enormous. Up to 400.000 metric tons of edible food is disposed every year caused by wrong treatment, handling and processing. Processing is the major point to deal with. In the case of manual processing in a cantina kitchen waste can be classified into waste associated with overproduction, product damages or technical interruptions. To reduce the amount of loss by using technical solutions it is possible to reduce up to 60 % of loss during the processing. Related to the product itself the automation and especially the scheduling of the processes in a commercial kitchen is more complex than the scheduling of standard products e.g. in the automotive sector. This article shows a solution to extend the criteria of production planning within an automated food processing environment. The paper introduces a product model that prescribes the progress of product quality while processing.

关键词： Scheduling Quality Food Processing

来源：评论

学校读者我要写书评

暂无评论

New microfluidic functionalities by nano- And micro-patterned moulds 16

New microfluidic functionalities by nano- And micro-patterne...

引用

16th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2016

作者： Edelmann, Jan Eckert, Udo Groß, Stefan Gründig, Bernd Wedig, Heiko Usov, Victor O'hara, Neal Scanlan, Declan Cross, Graham Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz Germany An EKF Diagnostics Company Senslab Gesellschaft zur Entwicklung und Herstellung bioelektrochemischer Sensoren mbH Leipzig Germany Adama Innovations Ltd. 13 Webworks Forster Street Galway Ireland

ISBN: (纸本)9780956679086

FaBiMed is a European project established to develop new manufacturing strategies for medical micro devices, using polymer replication in production of cost effective miniaturized micro and nanostructured components in biocompatible and functional materials. One demonstration line is dedicated to compact disposable lab-on-chip devices and requires micro and nano-structuring of the mould surface in order to change wetting characteristics of microfabricated devices and enable them with additional microfluidic functional features such as micro-channels or cell filters. Such features must be effectively replicated by hot-embossing (HE) or microinjection moulding (IM), at the same time avoiding time-dependent clogging by residual polymer, after multiple replication cycles. The paper describes the mould manufacturing process combining four sequential technologies as well as the replication results.

关键词： Microfluidics

来源：评论

学校读者我要写书评

暂无评论

Modeling of Heat Fluxes During Machining and Their Effects on Thermal Deformation of the Cutting Tool

引用

Procedia CIRP 2016年 46卷 611-614页

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

The heat fluxes generated by cutting processes lead to thermal deformations in the tools. Particularly, in precision machining it is essential to know the amount of the process heat and its distribution of heat fluxes into tool, workpiece and chips. This paper presents an extended methodology for the calculation of these heat fluxes in machining operations. Additionally, by comparison of experimental results with finite element simulations, the thermally caused tool center point (TCP) displacements in turn-milling operations are discussed. Furthermore, the influence of cooled air on TCP displacements is shown.

关键词： Machining Thermal Effects Process Heat Simulation Finite Element Method

来源：评论

学校读者我要写书评

暂无评论

Condition Monitoring of Piezoceramic Fibers During Joining by forming

引用

Procedia technology 2016年 26卷 144-151页

作者： W.-G. Drossel V. Wittstock S. Hensel M. Schmidt Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 09126 Chemnitz Germany Professorship for Adaptronics and Lightweight Design in Production Technische Universität Chemnitz 09107 Chemnitz Germany Professorship Machine Tools and Forming Technology Technische Universität Chemnitz 09107 Chemnitz Germany

Nowadays, piezoelectric transducers with sensor or actuator functionality are applied on the surface of components by bonding. New research activities enable a novel process chain for sensor integration in which piezoceramic fibers are integrated directly into the surface of metal sheets using joining by forming. Scope of the paper is to investigate a method for condition monitoring of the piezoceramic fibers during the joining process. Different test samples are prepared and studied by its inherent sensor function in terms of electrical impedance during various loads. As a result, a novel approach is presented for monitoring the preload status during the forming operation and detecting errors by electrical impedance spectroscopy. This method contributes to ensure a high-volume production.

关键词： piezoceramic fibers condition monitoring impedance spectroscopy joining by forming

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：