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Suche nach „[Jochen] [Hiller]“ hat 60 Publikationen gefunden
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    DigitalMaschinenbau und Mechatronik

    Beitrag (Sammelband oder Tagungsband)

    Jochen Hiller, D. Schmid, J. Merz

    New Method for Master Pattern Tool Correction Based on Computed Tomography Data and Intelligent Reverse Engineering

    iCT 2014 5th Conference on Industrial Computed Tomography (iCT) 2014

    2014

    Maschinenbau und Mechatronik

    Zeitschriftenartikel

    S. Zabler, Jochen Hiller, B. Baudrit, S. Horlemann, Peter Hornberger, A. Tissen

    Dimensionelles Messen und Materialprüfung an belasteten Bauteilen mit In-situ-CT

    inspect, vol. 15, no. 4, pp. 54-56

    2014

    Abstract anzeigen

    Die Anwendung der Röntgen-Computertomographie (CT) als zerstörungsfreie Prüfung (zfP) entwickelt sich zunehmend zu einem unverzichtbaren bildgebenden Verfahren in der Qualitätssicherung. Seit dem letzten Jahrzehnt wird diese Technologie verstärkt auch in der dimensionellen Messtechnik eingesetzt.

    Maschinenbau und Mechatronik

    Zeitschriftenartikel

    P. Müller, L. Chiffre, H. Hansen, Jochen Hiller, J. Andreasen, Y. Dai

    Estimation of measurement uncertainties in X-ray computed tomography metrology using the substitution method

    CIRP Journal of Manufacturing Science and Technology, vol. 7, no. 3, pp. 222-232

    2014

    DOI: 10.1016/j.cirpj.2014.04.002

    Abstract anzeigen

    This paper presents the application of the substitution method for the estimation of measurement uncertainties using calibrated workpieces in X-ray computed tomography (CT) metrology. We have shown that this, well accepted method for uncertainty estimation using tactile coordinate measuring machines, can be applied to dimensional CT measurements. The method is based on repeated measurements carried out on a calibrated master piece. The master piece is a component of a dose engine from an insulin pen. Measurement uncertainties estimated from the repeated measurements of the master piece were transferred on to additionally scanned uncalibrated workpieces which provided the necessary link for achieving traceable measurements.

    Maschinenbau und Mechatronik

    Zeitschriftenartikel

    R. Levi, L. Chiffre, Jochen Hiller, G. Genta, G. Barbato

    Measurement Uncertainty Evaluation in Dimensional X-ray Computed Tomography Using the Bootstrap Method

    International Journal of Precision Engineering and Manufacturing, vol. 15, no. 4, pp. 617-622

    2014

    DOI: 10.1007/s12541-014-0379-9

    Abstract anzeigen

    Industrial applications of computed tomography (CT) for dimensional metrology on various components are fast increasing, owing to a number of favorable properties such as capability of non-destructive internal measurements. Uncertainty evaluation is however more complex than in conventional measurement processes, e.g., with tactile systems, also due to factors related to systematic errors, mainly caused by specific CT image characteristics. In this paper we propose a simulation-based framework for measurement uncertainty evaluation in dimensional CT using the bootstrap method. In a case study the problem concerning measurement uncertainties was addressed with bootstrap and successfully applied to ball-bar CT measurements. Results obtained enabled extension to more complex shapes such as actual industrial components as we show by tests on a hollow cylinder workpiece.

    Maschinenbau und Mechatronik

    Zeitschriftenartikel

    P. Klit, K. Poulios, Jochen Hiller, G. Svendsen

    Coefficient of Friction Measurements for Thermophastics and Fibre Composites Under Low Sliding Velocity and High Pressure

    Tribology Letters, vol. 51, no. 2, pp. 191-198

    2013

    DOI: 10.1007/s11249-013-0107-0

    Abstract anzeigen

    Friction materials for typical brake applications are normally designed considering thermal stability as the major performance criterion. There are, however, brake applications with very limited sliding velocities, where the generated heat is insignificant. In such cases it is possible that friction materials which are untypical for brake applications, like thermoplastics and fibre composites, can offer superior performance in terms of braking torque, wear resistance and cost than typical brake linings. In this paper coefficient of friction measurements for various thermoplastic and fibre composite materials running against a steel surface are presented. All tests were carried out on a pin-on-disc test-rig in reciprocating operation at a fixed sliding speed and various pressure levels for both dry and grease lubricated conditions. Moreover, a generic theoretical framework is introduced in order to interpret the changes of friction observed during the running-in phase.

    Maschinenbau und Mechatronik

    Zeitschriftenartikel

    A. Cantatore, P. Müller, L. Chiffre, Jochen Hiller, J. Andreasen

    Computed Tomography as a Tool for Tolerance Verification of Industrial Parts

    Procedia CIRP, vol. 10, pp. 125-132

    2013

    DOI: 10.1016/j.procir.2013.08.022

    Abstract anzeigen

    Computed tomography (CT) is becoming an important technology for industrial applications, enabling fast and accurate control of manufactured parts. In only a few minutes, a complete 3D model of a part may be obtained, allowing measurements of external and internal features. This paper presents results of tolerance verification of a plastic housing for an insulin pen manufactured by Novo Nordisk A/S. Calculation of measurement uncertainties was taken into account in decision making regarding the specified tolerance limits. Variables in terms of CT systems, data sets, and evaluation software are considered in this study.

    DigitalMaschinenbau und Mechatronik

    Zeitschriftenartikel

    Jochen Hiller, L. Reindl

    A computer simulation platform for the estimation of measurement uncertainties in dimensional X-ray computed tomography

    Measurement, vol. 45, no. 8, pp. 2166-2182

    2012

    DOI: 10.1016/j.measurement.2012.05.030

    Maschinenbau und Mechatronik

    Zeitschriftenartikel

    Jochen Hiller, L. Reindl, M. Maisl

    Physical characterization and performance evaluation of an x-ray micro-computed tomography system for dimensional metrology applications

    Measurement Science and Technology, vol. 23, no. 8

    2012

    DOI: 10.1088/0957-0233/23/8/085404

    Abstract anzeigen

    This paper presents physical and metrological characterization measurements conducted for an industrial x-ray micro-computed tomography (CT) system. As is well known in CT metrology, many factors, e.g., in the scanning and reconstruction process, the image processing, and the 3D data evaluation, influence the dimensional measurement properties of the system as a whole. Therefore, it is important to know what leads to, and what are the consequences of, e.g., a geometrical misalignment of the scanner system, image unsharpness (blurring), or noise or image artefacts. In our study, the two main components of a CT scanner, i.e. the x-ray tube and the flat-panel detector, are characterized. The contrast and noise transfer property of the scanner is obtained using image-processing methods based on linear systems theory. A long-term temperature measurement in the scanner cabinet has been carried out. The dimensional measurement property has been quantified by using a calibrated ball-bar and uncertainty budgeting. Information about the performance of a CT scanner system in terms of contrast and noise transmission and sources of geometrical errors will help plan CT scans more efficiently. In particular, it will minimize the user's influence by a systematic line of action, taking into account the physical and technical limitations and influences on dimensional measurements.

    Maschinenbau und Mechatronik

    Beitrag (Sammelband oder Tagungsband)

    A. Cantatore, P. Müller, L. Chiffre, Jochen Hiller, M. Bartscher

    New reference object for Metrological performance testing of industrial CT systems

    Proceedings of the 12th euspen International Conference (Juni 2012, Stockholm, Schweden)

    2012

    Maschinenbau und Mechatronik

    Beitrag (Sammelband oder Tagungsband)

    P. Klit, K. Poulios, Jochen Hiller, G. Svendsen

    Coefficient of Friction Measurements for Thermoplastics and Fiber Composites under Low Sliding Velocity and High Pressure

    Proceedings of the 15th Nordic Symposium on Tribology 2012 (NordTrib, Trondheim, Norwegen)

    2012

    Maschinenbau und Mechatronik

    Zeitschriftenartikel

    A. Cantatore, P. Müller, L. Chiffre, Jochen Hiller

    A study on evaluation strategies in Dimensional X-ray computed tomography by estimation of measurement uncertainties

    International Journal of Metrology and Quality Engineering, vol. 3, no. 2, pp. 107-115

    2012

    DOI: 10.1051/ijmqe/2012011

    Abstract anzeigen

    Computed tomography has entered the industrial world in 1980’s as a technique for non-destructive testing and has nowadays become a revolutionary tool for dimensional metrology, suitable for actual/nominal comparison and verification of geometrical and dimensional tolerances. This paper evaluates measurement results using different measuring strategies applied in different inspection software packages for volume and surface data analysis. The strategy influence is determined by calculating the measurement uncertainty. This investigation includes measurements of two industrial items, an aluminium pipe connector and a plastic toggle, a hearing aid component. These are measured using a commercial CT scanner. Traceability is transferred using tactile and optical coordinate measuring machines, which are used to produce reference measurements. Results show that measurements of diameter for both parts resulted in smaller systematic errors compared to distance and height measurements. It was found that uncertainties of all measurands evaluated on surface data were generally greater compared to measurements performed on volume data.

    Maschinenbau und Mechatronik

    Zeitschriftenartikel

    Jochen Hiller, L. Reindl

    A computer simulation for the estimation of measurement uncertainties in dimensional X-ray computed tomography

    Measurement, pp. 2166-2182

    2012

    Maschinenbau und Mechatronik

    Zeitschriftenartikel

    S. Kasperl, Jochen Hiller, T. Fuchs, L. Reindl

    Einfluss der Bildqualität röntgentomographischer Abbildungen auf Koordinatenmessungen

    Grundlagen, Messungen und Simulationen

    tm - Technisches Messen, no. 7/8, pp. 334-347

    2011

    DOI: 10.1524/teme.2011.0137

    Abstract anzeigen

    Die industrielle Computertomographie (CT) findet in der dimensionellen Messtechnik zunehmend Akzeptanz. Allerdings ist noch wenig über den konkreten Einfluss verschiedener Systemkomponenten, physikalischer Störgrößen oder Bildverarbeitungsschritte auf dimensionelle CT-Messungen bekannt. In diesem Beitrag werden physikalische Bildgütemerkmale zur Beurteilung der Bildqualität in der CT vorgestellt und mittels Computersimulationen der Einfluss der Rekonstruktionsbildgüte auf Koordinatenmessungen untersucht.

    Maschinenbau und Mechatronik

    Beitrag (Sammelband oder Tagungsband)

    A. Cantatore, P. Müller, L. Chiffre, Jochen Hiller

    Investigation of measuring strategies in computed tomography

    Proceedings of the International Conference on Advanced Manufacturing Engineering (Newstech, Brno, Tschechische Republik)

    2011

    Maschinenbau und Mechatronik

    Beitrag (Sammelband oder Tagungsband)

    S. Kasperl, Jochen Hiller

    Dimensionelles Messen mit Helix-Computertomographie

    Leitfaden zur industriellen Computertomographie

    2010

    Maschinenbau und Mechatronik

    Beitrag (Sammelband oder Tagungsband)

    S. Kasperl, Jochen Hiller, L. Reindl

    Charakterisierung und Modellierung eines μCT-Systems

    Berichtsband ITG/GMA-Fachtagung Sensoren und Messsysteme (Nürnberg)

    2010

    Maschinenbau und Mechatronik

    Beitrag (Sammelband oder Tagungsband)

    S. Kasperl, Jochen Hiller

    Zum Verhältnis von Bildqualität und Messgenauigkeit in der CT-Metrologie

    Berichtsband Industrielle Computertomografie Tagung (Wels, Österreich)

    2010

    Maschinenbau und Mechatronik

    Beitrag (Sammelband oder Tagungsband)

    D. Weiss, S. Kasperl, Jochen Hiller

    Comparison of Probing Error in Dimensional Measurement by Means of 3D Computed Tomography

    Proceedings of the 2nd International Symposium on NDT in Aerospace (Hamburg)

    2010

    Maschinenbau und Mechatronik

    Zeitschriftenartikel

    S. Kasperl, Jochen Hiller, M. Krumm

    Computed Tomography Metrology in Industrial Research and Development

    MP - Materials Testing, vol. 51, no. 9, pp. 405-411

    2009

    DOI: 10.3139/120.110053

    Abstract anzeigen

    Beim zerstörungsfreien Prüfen wird die Computertomographie (CT) zunehmend für dimensionelle Messaufgaben eingesetzt, wie beispielsweise in der industriellen Werkstückprüfung. Neben der Bestimmung der Messunsicherheit ist die Verbesserung der Bildqualität Gegenstand aktueller Forschungen, um die CT als Koordinatenmessgerät zu etablieren.

    Maschinenbau und Mechatronik

    Beitrag (Sammelband oder Tagungsband)

    V. Weizel, S. Kasperl, Jochen Hiller, T. Fuchs, I. Bauscher, U. Hassler, Oeckl, S. Schröpfer, S., T. Schön

    Dimensionelles Messen mit Helix-Computertomographie

    Berichtsband BB-115 zur DGZfP-Jahrestagung (Münster)

    2009