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Data Mining and Machine Learning Methods Applied to A Numerical Clinching Model

Computer Modeling in Engineering & Sciences 2018年第12期117卷 387-423页

作者： Marco Gotz Ferenc Leichsenring Thomas Kropp Peter Müller Tobias Falk Wolfgang Graf Michael Kaliske welf-guntram drossel Institute for Structural Analysis Technische UniversitatDresdenGermany Fraunhofer Institute for Machine Tools and Forming Technology DresdenGermany

Numerical mechanical models used for design of structures and processes are very complex and high-dimensionally *** understanding of the model characteristics is of interest for engineering tasks and subsequently for an efficient *** analysis methods are known and available to gain insight into existing *** this contribution,selected methods from various fields are applied to a real world mechanical engineering example of a currently developed clinching *** selection of introduced methods comprises techniques of machine learning and data mining,in which the utilization is aiming at a decreased numerical *** methods of choice are basically discussed and references are given as well as challenges in the context of meta-modelling and sensitivities are *** incremental knowledge gain is provided by a step-bystep application of the numerical methods,whereas resulting consequences for further applications are ***,a visualisation method aiming at an easy design guideline is *** visual decision maps incorporate the uncertainty coming from the reduction of dimensionality and can be applied in early stage of design.

关键词： Design data mining computational intelligence meta-modelling permissible design space sensitivity analysis self-organizing maps inverse problem early stage of design clinching

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Monitoring concept for structural integration of PZT-fiber arrays in metal sheets:a numerical and experimental study

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International Journal of Smart and Nano Materials 2018年第1期9卷 56-67,I0003页

作者： welf-guntram drossel Andreas Schubert Matthias Putz Hans-Joachim Koriath Volker Wittstock Sebastian Hensel Alexander Pierer Benedikt Müller Marek Schmidt Fraunhofer Institute for Machine Tools and Forming Technology ChemnitzGermany Professorship for Adaptronics and Lightweight Design Chemnitz University of TechnologyChemnitzGermany Professorship Micromanufacturing Technology Chemnitz University of TechnologyChemnitzGermany Professorship for Machine Tools and Forming Technology Chemnitz University of TechnologyChemnitzGermany

The technique joining by forming allows the structural integration of piezoceramic fibers into locally microstructured metal sheets without any elastic interlayers.A high-volume production of the joining partners causes in statistical deviations from the nominal dimensions.A numerical simulation on geometric process sensitivity shows that the deviations have a high significant influence on the resulting fiber stresses after the joining by forming operation and demonstrate the necessity of a monitoring *** this basis,the electromechanical behavior of piezoceramic array transducers is investigated experimentally before,during and after the joining *** piezoceramic array transducer consists of an arrangement of five electrical interconnected piezoceramic *** findings show that the impedance spectrum depends on the fiber stresses and can be used for in-process monitoring during the joining *** on the impedance values the preload state of the interconnected piezoceramic fibers can be specifically controlled and a fiber overload.

关键词： Impedance spectroscopy joining by forming process monitoring function integration sensitivity

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Experimental and Simulation-based Investigation of a Velocity Controller Extension on a Ball Screw System

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Journal of Mechanics Engineering and Automation 2015年第4期5卷 220-228页

作者： Rico MOnster Michael Walther Holger Schlegel welf-guntram drossel Institute of Machine Tools and Production Processes Faculty of Mechanical Engineering Technische Universitdt ChemnitzChemnitz 09126 Germany

The background of this contribution is the enhancement of the achievable accuracy of servo-screw-presses. Therefore, the paper is concerned with the improvement of the dynamic precision for direct driven servo axes which is still restricted by structural vibrations. For this purpose, a ball screw test rig was analyzed for which the standard cascade control structure was extended by an additional velocity feedback. This structural extension has the potential to improve the controller performance significantly due to a better damping of low frequent vibrations. Furthermore, a parametric dynamic model for the control structure was derived to investigate the effects of the controller extension. For this analysis, the influences of the used tuning factors and filters is discussed in the frequency domain based on bode plots. The results of these cognitions are transferred to the time domain and illustrated by step responses. In addition, an evaluation by the criterion of the IAE （integral of absolute error） and the Prony analysis is carried out. Finally, the results are experimentally verified at the ball screw test rig. The paper closes with the conclusions.

关键词： Velocity controller extension servo-screw-press advanced position control integral absolute error Prony analysis.

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