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检索条件"机构=Institute of Control Engineering of Machine Tools and Manufacturing Units"

共 340 条记录，以下是31-40 订阅

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Continuous learning support vector machine to estimate stability lobe diagrams in milling 24

Continuous learning support vector machine to estimate stabi...

引用

24th International Conference on Flexible Automation and Intelligent manufacturing, FAIM 2014

作者： Friedrich, Jens Hartmann, Henning Verl, Alexander Lechler, Armin Institute for Control Engineering of Machine Tools and Manufacturing Units University of Stuttgart StuttgartD-70174 Germany

ISBN: (纸本)9781605951737

The productivity of milling processes is limited by the occurrence of chatter vibrations. The correlation of the maximum stable cutting depth and the spindle speed can be shown in a stability lobe diagram (SLD). Today it is a great effort to estimate the SLD. Lot's of experiments are necessary to measure the SLD or derive a detailed mathematical model to calculate the SLD. Moreover not only cutting depth, but also the cutting width should be taken into account. This paper presents an approach to learn the multidimensional stability lobe diagram (MSLD) during the production based on continuously measured signals using a support vector machine. The support vector machine is extended to make it capable for continuous learning and time-variant systems. The process conditions are classified as stable or unstable. The learned MSLDs are very similar to the analytically calculated MSLDs. Changes over time in the system dynamics can also be learned by the proposed algorithm. © Copyright 2014 by DEStech Publications, Inc. All rights reserved.

关键词： Support vector machines

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Detection of abembly variations for automatic program adaptation in roboticwelding systems 47

Detection of abembly variations for automatic program adapta...

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47th International Symposium on Robotics, ISR 2016

作者： Kub, Alexander Schneider, Ulrich Dietz, Thomas Verl, Alexander Fraunhofer Institute for Manufacturing Engineering Automation IPA Stuttgart Germany Institute for Control Engineering of Machine Tools Manufacturing Units ISW Stuttgart Germany

ISBN: (纸本)9783800742318

This paper proposes a novel approach for detection of abembly variations to adapt the programming of a robotic welding system. A matching proceb is performed between the different parts of an abembly CAD model and a measured point cloud using an Iterative Closest Point algorithm to determine abembly variations. Experimental validation is performed with an industrial robot equipped with stereo camera and welding gun. A method for accurate calibration of sensor and welding gun is presented as it influences the quality of the welding proceb. Experimental results show an increased weld seam quality and the robustneb of the proposed approach in industrial applications. © 2016 VDE VERLAG GMBH Berlin Offenbach.

关键词： Welding

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On Kinetostatics and Workspace Analysis of Multi-platform Cable-Driven Parallel Robots with Unlimited Rotation

On Kinetostatics and Workspace Analysis of Multi-platform Ca...

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作者： Reichenbach, Thomas Tempel, Philipp Verl, Alexander Pott, Andreas Institute of Control Engineering for Machine Tools and Manufacturing Units University of Stuttgart Seidenstrasse 36 Stuttgart70174 Germany

Cable-driven parallel robots are a special kind of parallel mechanism which use cables instead of rigid prismatic actuators to control a single platform. This paper presents a modeling approach to replace the single platform by multiple platforms. With this approach, it is possible to perform unlimited rotation with cable robots end-effector by relatively positioning these multiple platforms. We show how this class of cable robots can be modeled as multi-body system, where platforms are connected with linkages by using revolute joints. These linkages can be seen as coupling elements. For example, using a crankshaft as coupling element, cable robots can perform novel motions such as unlimited rotation. We find a generic approach describing such multi-platform cable robot systems, after which force distribution and workspace of a case study are analyzed. Finally, we find out that inclusion and total orientation workspace are nonempty, considering joint reaction forces and platform and linkage masses. Furthermore, our modeling approach can be used for spatial multi-platform cable robots with revolute joints. © 2020, Springer Nature Switzerland AG.

关键词： Rotation

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Automatic synthesis of a saturating state space controller based on convex optimization for industrial robots 52

Automatic synthesis of a saturating state space controller b...

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52nd International Symposium on Robotics, ISR 2020

作者： Halt, Lorenz Pott, Andreas Fraunhofer Institute for Manufacturing Engineering and Automation IPA Stuttgart70569 Germany Institute for Control Engineering of Machine Tools and Manufacturing Units Stuttgart70174 Germany

ISBN: (纸本)9783800754298

Robotic control needs to be optimal if it is to stay competitive in industrial production scenarios. However, highly tweaked controllers cannot directly transfer from one robot setup to another. Thus, the controllers must be automatically generated concerning their use in specific production processes. This paper presents an automatic synthesis of an almost timeoptimal model-based saturating state space controller. The control parameters are derived from the solution of a convex optimization problem. The approach complements previous work of transferable skill-based programming for robotic assembly in particular. This paper introduces the problem formulation, exercises the optimization on a task space controlled industrial robot, and finally evaluates it in simulation and compares experimental results with a state-of-the-art industrial robot controller. © 2020 VDE Verlag GMBH.

关键词： Industrial robots

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Investigations of a small machine tool with CFRP-frame 13

Investigations of a small machine tool with CFRP-frame

引用

13th International Conference of the European Society for Precision engineering and Nanotechnology, EUSPEN 2013

作者： Hoffmeister, H.-W. Gerdes, A. Verl, A. Wurst, K.-H. Heinze, T. Batke, C. TU Braunschweig Institute of Machine Tools and Production Technology Braunschweig Germany Universität Stuttgart Institute for Control Engineering of Machine Tools and Manufacturing Units Stuttgart Germany

ISBN: (纸本)9780956679024

Experimental investigations regarding energy consumption in cooperative mode show a reduction of kinetic energy of about 50 %. However the power consumption increases in cooperative mode due to necessary additional drive and electric losses. Numerical Results show a maximum thermal deformation of 5 μm of the test workpiece due to the clamping process. The CFRP-frame shows a high stiffness and low dynamic magnitudes and is suitable for use as machine tool frame also due to its thermal stability and subsequently higher precision of the machine tool.

关键词： machine tool kinetic energy Power consumption Electric losses energy consumption

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Anisotropic Damping and Stiffness of laminated steel parts using adhesive bonding - an empirical influence study 56

Anisotropic Damping and Stiffness of laminated steel parts u...

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56th CIRP International Conference on manufacturing Systems, CIRP CMS 2023

作者： Helfesrieder, Nico Neubauer, Michael Lechler, Armin Verl, Alexander University of Stuttgart Institute for Control Engineering of Machine Tools and Manufacturing Units Seidenstraße 36 Stuttgart70174 Germany

Layered part manufacturing enables part topology to be optimized internally by structuring individual layers separately, which is especially promising for large machine parts. However, the resulting part properties as a function of the selected manufacturing parameters are largely unexplored. Therefore, this paper investigates the impacts of the slicing direction, the sheet thickness as well as the adhesive on anisotropic damping and stiffness values of adhesively bonded steel parts. A cantilever beam of symmetric cross-section is chosen as an easy-to-manufacture geometry. Three redundant specimens were prepared for each of six parameter variations investigated within this study, resulting in a total of 18 investigated beams. The results indicate highly anisotropic stiffness and damping as a function of the layer build-up direction and it was found that the modal damping rises with increasing amount of adhesive. These findings must be taken into account for future applications of layered lightweight machine parts and their simulative predictability should be studied. © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://***/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the 56th CIRP International Conference on manufacturing Systems 2023.

关键词： Adhesive Bonding Damping Experimental Modal Analysis (EMA) Laminated Object manufacturing (LOM) Layer Laminated manufacturing (LLM)

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Automated manufacturing Toolchain using Skill-based Digital Twins 34

Automated Manufacturing Toolchain using Skill-based Digital ...

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34th CIRP Design Conference, CIRP 2024

作者： Dietrich, David Neubauer, Michael Lechler, Armin Verl, Alexander Institute for Control Engineering of Machine Tools and Manufacturing Units University of Stuttgart Seidenstr. 36 Stuttgart70174 Germany

Digital twins with a skill-based description are increasingly finding their way into industrial production. Their models link properties of a product with available process capabilities that are realized by resource skills. A matchmaking derives capable resources, e.g. for modular assembly systems. For capability-based planning in manufacturing, integration with computer-aided design (CAD) and computer-aided manufacturing (CAM) programs is missing. This paper presents an automated toolchain with focus on subtractive manufacturing using skill-based digital twins. Product-Process-Resource (PPR) models are used and enriched with subtractive manufacturing information and further relations. A configurator allows the design of the individual digital product twin, which can synchronously be generated as a 3D model using a CAD service. Necessary subtractive manufacturing steps including capable resources are then determined in a planning environment and fed into the CAM system. This allows an individual generation of machining code based on PPR information, which can be validated on a simulation model. The result is an automated tool chain of different software services, which are composed by a common description of the PPR model and the software services themselves. By defined models and interfaces the toolchain is not restricted to subtractive manufacturing but enables the integration of computer-aided everything (CAx) services. © 2024 The Authors. Published by Elsevier B.V.

关键词： Smart manufacturing

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Case Study on using Layer Laminate manufacturing for Large Lightweight Parts with high Structural Damping 57

Case Study on using Layer Laminate Manufacturing for Large L...

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18th IFAC Workshop on Time Delay Systems, TDS 2024

作者： Helfesrieder, Nico Furcoi, Florentin Jud, Oliver Lechler, Armin Verl, Alexander University of Stuttgart Institute for Control Engineering of Machine Tools and Manufacturing Units Seidenstraße 36 Stuttgart70174 Germany

Layer Laminated manufacturing (LLM) enables the inner optimization of parts through the joining of individually structured layers. Particularly for high-volume metal parts, for which structural optimization and additive manufacturing is possible but typically too expensive, LLM can offer a good alternative. Using adhesive bonding to join the layers, stiffness is expected to decrease, but part damping may be increased strongly. These effects have already been shown individually, but using scientific examples rather than real world examples. Therefore, this paper presents a case study that investigates the extent to which lightweight design and damping can be applied specifically by LLM with adhesive bonding. For this, a machine table of a feed axis is topology optimized, manufactured using the LLM-method, and examined experimentally. The validation includes experimental modal analysis, static bending tests and damping identification in the installation situation. The results indicate high design freedom and lightweight potential for large metallic parts. Additionally, the damping is significantly increased in the isolated examination, but only minor improvements are recognizable in the actual installation situation. © 2024 The Authors.

关键词： Bending tests

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Software-defined manufacturing: Data Representation 16

Software-defined Manufacturing: Data Representation

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16th CIRP Conference on Intelligent Computation in manufacturing engineering, CIRP ICME 2022

作者： Ellwein, Carsten Neumann, Rebekka Verl, Alexander Institute for Control Engineering of Machine Tools and Manufacturing Units University of Stuttgart Seidenstraße 36 Stuttgart70174 Germany

Due to constantly decreasing product cycles, a fast adaptability of manufacturing plants is a prerequisite for profitable operation. The paradigm of Software-defined manufacturing (SDM) pursues this overriding goal by decoupling software from mechanical and electrical components. In this way, SDM allows the free definition of functionality, purely through software, limited only by the physical limitations of the machines and systems. This paper analyzes existing approaches that pursue the goal of digitally representing manufacturing to enable flexible adaptation. Based on this analysis, a model for the data representation is proposed that allows consistent use across the entire supply chain. © 2023 Elsevier B.V.. All rights reserved.

关键词： Supply chains

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RTNNIgen - An Open-Source PLC Library and Python Generator Converting Keras Models to Realtime Capable Structured Text 50

RTNNIgen - An Open-Source PLC Library and Python Generator C...

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50th Annual Conference of the IEEE Industrial Electronics Society, IECON 2024

作者： Hinze, Christoph Zhou, Zexu Xu, Haijia Lechler, Armin Verl, Alexander Institute for Control Engineering of Machine Tools and Manufacturing Units University of Stuttgart Seidenstr. 36 Stuttgart70174 Germany

ISBN: (纸本)9781665464543

Recent advances in AI research are boosting the relevance of realtime neural networks in automation technology. To facilitate the deployment of trained neural networks for realtime applications, where hard limits on upper cycle time are required, this paper contributed a two-fold approach: A Python library for parsing Keras sequential models to structured text using a single function-call, which can be run directly on industrial PLCs and a structured text library to encapsulate reoccurring code and to provide a readable, tested interface for the generated code. The resulting models are experimentally validated regarding their inference time and precision of the outputs. © 2024 IEEE.

关键词： Python

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