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A new simulation and optimization tool for calculating the attenuation of airborne and structure-borne sound of maritime silencers 47

A new simulation and optimization tool for calculating the a...

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47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, INTER-NOISE 2018

作者： Lindner, Paul Schulze, Christian Hübelt, Jörn Georgi, Tom Troge, Jan Gesellschaft für Akustikforschung Dresden mbH Blumenstraße 80 Dresden01307 Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Nöthnitzer Straße 44 Dresden01187 Germany

The acoustical impact of silencers is restricted by the influence of structure-borne sound. Thereby, excitation and radiation of structure-borne sound play an important role, as well as its transmission along the silencer system. In the design process of a silencer the influence of structure-borne sound on the damping effect is mostly considered by empirical estimations, which can cause an oversized construction. For calculating structure-borne sound in maritime silencers with their typical large dimensions, the application of statistical methods is a possible problem-solving approach. In this contribution, a new simulation and optimization tool is presented, considering the decreased damping effect of silencers due to structure-borne sound. The tool is based on Statistical Energy Analysis (SEA). Results of analytical and experimental SEA are compared. These results were obtained on downscaled silencers and have been transferred to real maritime silencers. Especially the SEA-parameters loss factor and coupling loss factor, airborne and structure-borne sound energies and the number of relevant modes are considered. Based on the measured damping of a silencer compared with numerical and statistical calculations, the capability for optimizing the design process of large silencers is shown. © INTER-NOISE 2018 - 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering. All rights reserved.

关键词： Damping

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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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Identification of modal parameters of machine tools during cutting by operational modal analysis

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Procedia CIRP 2018年 77卷 473-476页

作者： Jan Berthold Martin Kolouch Volker Wittstock Matthias Putz 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 differs between standstill and process state. Operational modal analysis (OMA) makes possible to identify modal parameter under process conditions. In this paper, it is shown, how far the assumption of a time-invariant behaviour as well as a broadband excitation can be fulfilled by exciting the machine with a cutting process. After describing the dynamic behaviour in the work space to determine a time-invariant tool path, a broadband excitation is generated by changing cutting parameters during milling. The modal parameters are identified by different OMA methods and compared to results of the experimental modal analysis.

关键词： machine Tool Dynamics Operational Modal Analysis

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forming 4.0: Smart machine components applied as a hybrid plain bearing and a tool clamping system

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Procedia Manufacturing 2019年 27卷 65-71页

作者： R. Kurth R. Tehel T. Päßler M. Putz K. Wehmeyer C. Kraft H. Schwarze Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 09126 Chemnitz Germany Berg & Co. GmbH Gildemeisterstraße 80 33689 Bielefeld Germany Technical University Clausthal Institute of Tribology and Energy Conversion Machinery Leibnizstraße 32 38678 Clausthal-Zellerfeld Germany

Higher process reliability as well as detailed information about the machine condition are necessary requirements for the manufacturing of complex geometric shapes with simultaneous increase of the machine availability and output rate. By implementing smart machine components it is possible to solve central challenges focusing on the investment-intensive field of forming technology. These components gather and evaluate machine and process data on decentralized spots with certain integrated sensors. Within this paper the potential benefits of those smart machine components are demonstrated using the example of an intelligent hybrid plain bearing and a smart tool holder. Focusing on the damage prevention of plain bearings, a load controlled journal bearing combining hydrodynamic and hydrostatic characteristics has been developed and tested by simulation. In addition, a smart hydraulic tool holder for upper dies has been successfully tested by simulations and experiments in order to investigate and demonstrate the potential for using the monitored clamping characteristics to increase the process transparency and the condition of the tool holder. As a result these smart machine components can be used additionally for a significant improvement of industry 4.0 tools such as digital twins of both process and machine.

关键词： industry 4.0 sensor integration plain bearing journal bearing tool clamping condition monitoring smart components process monitoring

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Target-oriented Analysis of Resource Consumption in Manufacturing Process Chains

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Procedia Manufacturing 2018年 21卷 462-467页

作者： A. Demmer N. Klingbeil F. Klocke M. Putz R. Schmitt T. Vollmer Fraunhofer-Institute for Production Technology IPT Steinbachstrasse 17 Aachen 52074 Germany Fraunhofer-Institute for Machine Tools and Forming Technology IWU Reichenhainer Strasse 88 Chemnitz 09126 Germany

Nowadays, manufacturing companies have to view their resource consumption as a cost driver in order to identify efficient and economical processes. Methodologies for investigating, assessing and comparing process chains are vital in order to gain an accurate insight into cost drivers over the course of the entire process chain [1]. Scrutiny of this nature enables cost drivers to be identified via the parameters process time, machine and staff costs in addition to costs related to energy, material and consumables. A review of the usage phase permits elevated costs during manufacture to be justified by reduced costs during operation. The allocation of costs to resources within individual cost-driving process steps ensures target-oriented derivation of improvement measures. The methodology has been designed to serve as basis for production planning, for example, with regard to (energy and resource) efficiency and applied to low-pressure turbine blades made of nickel-base alloys and titanium aluminide. A dedicated analysis of process chain costs provides an insight into the development of individual production costs. This information forms a basis on which to make decisions regarding output quantity or the most appropriate time for investment in new machines. In conjunction with the process chain comparison, this serves as a basis for the integration of the results obtained into a data base which allows the user to select a goal-oriented process chain selection. The data base can provide information regarding the organization of production chains in order to ensure that the product is manufactured accordingly to reduce resources, energy consumption, process times or overall costs.

关键词： Energy efficiency Manufacturing process Production planning

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Suspension technology for Abrasive Waterjet (AWJ) Cutting of Ceramics

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Procedia CIRP 2018年 77卷 367-370页

作者： M. Putz M. Dix F. Morczinek M. Dittrich Fraunhofer Institute for Machine Tools an Forming Technology IWU 09126 Chemnitz Germany Institute for Machine Tools and Production Processes (IWP) Chemnitz University of Technology Reichenhainer Str. 70 09126 Chemnitz Germany

Hard machining of brittle materials like ceramics is a process-oriented challenge. It has been shown that abrasive water jet cutting is an appropriate alternative to commonly used diamond grinding or laser cutting processes. In Abrasive water jet machining the injection technology is currently used almost exclusively. Due to the realization of the suspension jet technology a higher cutting performance can be achieved. In this article the known injection principle and the suspension principle will be compared. Therefore, influences on the quality were examined for trimming technical ceramics. The investigation illustrates that suspension technology trims with a higher accuracy than injection technology in matters of kerf geometry and roughness parameters.

关键词： Waterjet machining Sustainable machining Ceramic

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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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High Precision Machining of Hybrid Layer Composites by Abrasive Waterjet Cutting

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Procedia Manufacturing 2018年 21卷 583-590页

作者： M. Putz A. Rennau M. Dix Chemnitz University of Technology Institute for Machine Tools and Production Processes (IWP) Reichenhainer Str. 70 09126 Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 09126 Chemnitz Germany

In industrial applications the increasing variety of high performance materials and their combination to material composites is challenging for the common machining processes. Their high application range combined with minimal forces and no significant thermal loads predestinates abrasive waterjet cutting for machining such complex structures. This paper verifies the high precision machinability of 2D- and 3D-layer composites out of CFRP and a lightweight metal such as aluminum or magnesium using the abrasive waterjet. Therefore, different cutting strategies were determined as well as process influences to the joining zone and characteristics of the machined component.

关键词： Waterjet machining Fiber reinforced plastic Hybrid layer composite

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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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Efficient quantification of free and forced convection

Efficient quantification of free and forced convection

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89th Annual Meeting on the International Association of Applied Mathematics and Mechanics, GAMM 2018

作者： Glänzel, Janine Stoll, Martin Unger, Roman Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 Chemnitz09126 Germany Technische Universität Chemnitz Faculty of Mathematics Reichenhainer Straße 41 Chemnitz09126 Germany

Thermo-elastic deformations represent one of the main reasons for positioning errors in machine tools. Investigations of the thermo-mechanical behaviour of machine tools often rely on accurate simulations involving large-scale CFD simulations, where the heat transfer coefficient is computed. It has been shown that radial basis functions (RBFs) are a valid tool to reduce the number of CFD simulations by interpolation. We here present an efficient approach for the case of a three-axis milling machine. © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

关键词： machine tools

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