Satu Kärki, Jukka Lekkala, Tiina Kaistila, Heikki-Jussi Laine, Heikki Mäenpää, Hannu Kuokkanen
A variety of methods to process plantar pressure distribution data are available. The aim of this study was to compare alternative methods to compute a pressure map from collected data. Correlation coefficients between the pressure maps were used to ascertain whether the pressure maps contain the same information. The interface pressure data of twenty subjects was collected for the data analysis with commercial GAITRite® walkway system. Stationary pressure distribution and pressure distributions at normal and fast walking speeds were recorded with each subject. The data was analyzed with...
XIX IMEKO World Congress
· TC13
· 2009
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Albert Weckenmann, Johannes Bernstein
Nowadays the process-control of concave extruding is a measuring task with rising requirements. A novel optical bi-sensorial measurement system – consisting of a shadow- and a light-section-system – as well as suitable methods of analysis for the in-line inspection are presented. The proposals help to ensure the product quality on a higher level than before. The combination of dimensional accuracy and data-density leads to excellent results. The optical multi-sensor measurement system has to be calibrated and aligned to detect the same surface zone despite of high refresh rates and optical...
XIX IMEKO World Congress
· TC14
· 2009
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Valery A. Granovsky, Mikhail D. Kudryavtsev, Alexandr I. Ryskin, Alexandr S. Shcheulin
A new multivalued measure of plane angle is proposed, which is based on a highly stable system of superimposed holograms recorded in a photochromic material. Their mutual position forms a reference set of angles, which is stored by the measure and can be reproduced by a reference laser. The methods for fabricating a holographic measure (recording and reproducing holograms forming it) are discussed. One of two possible modifications of such a measure is implemented on the basis of calcium fluoride crystals with color centres. The technique for preparing this measure (holographic prism) and...
XIX IMEKO World Congress
· TC14
· 2009
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Denise das Mercês Camarano, Roberto Márcio de Andrade
Validation of a numerical simulation based on mathematical model is part of its development and in practice this validation is based on the comparison with experiments. However, the uncertainty of experiment and numerical simulation has not yet received any attention. Generally, only a qualitative assessment of the numerical simulation is provided. Knowledge of the uncertainty is required in order to compare the results since it allows users of the result to assess its reliability. This paper emphasizes numerical simulation components uncertainties. A procedure is adopted to validation of...
XIX IMEKO World Congress
· TC12
· 2009
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Fabrício Lima Migliorini, Egonn Hendrico Carvalho Silva, Pablo Andrade Grossi, Ricardo Alberto Neto Ferreira, Denise das Mercês Camarano
Flash methods have become one of the most commonly used techniques for measuring the thermal diffusivity and thermal conductivity of solids and liquids. This method has received standard status for the measurement of thermal diffusivity of materials such as metals, carbon materials, ceramics and polymers. An uncertainty analysis of the thermal diffusivity measurement using the laser flash method will be presented in this paper. This metrological investigation follows the general rules for evaluating and expressing the uncertainty in the LMPT – Laboratório de Medição de Propriedades...
XIX IMEKO World Congress
· TC12
· 2009
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Jörg Bargenda, Maik Schumann, Martin Correns, Mathias Schellhorn, Holger Weißensee, Maik Rosenberger, Gerhard Linß
This paper presents in detail the relevance and the potential of a novel approach for process modeling in creation of fixed sequences of various measurement steps using optical coordinate measurement devices.
XIX IMEKO World Congress
· TC14
· 2009
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Zoltán Zelenka
The Austrian Federal Office of Metrology and Surveying (BEV) has developed and realized in cooperation with Sartorius AG (Göttingen) and the Vienna University of Technology, three handling systems for automatic calibration of weights on high-precision mass comparators. The operation of these systems has an unusual aspect. The robot covering the measuring range from 1 milligram up to 10 gram is a flexible tool to calibrate the majority of the weights. An analysis of this system shows that it has excellent repeatability, but also a systematic error. A modified weighing design is helpful to...
XIX IMEKO World Congress
· TC3
· 2009
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Vicente León-Martínez, Joaquím Montañana-Romeu, José Roger-Folch, Antonio Cazarola-Navarro
This paper shows utility of phasor total unbalance power as a tool to explain working of unbalanced power systems. Conditions under shunt capacitors used to compensate reactive power can deteriorate the efficiency in three-phase four-wire unbalanced at loads power systems are described. Reactive phenomenon is studied using Emanuel´s positive-sequence fundamental-frequency reactive power, included in the IEEE Standard 1459-2000. Unbalance phenomenon is analyzed using the phasor total unbalance power. This quantity measures unbalance power due to the active loads by separating of those caused...
XIX IMEKO World Congress
· TC4
· 2009
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Sven Kuhn
This paper describes the advantage of carrier frequency amplifiers in rotating torque flanges. It gives an overview of the systematic effects and random errors which disturb the torque measurement and shows how the measurement errors can be suppressed by means of carrier frequency technology. The resulting high reproducibility and linearity of the new torque flange with digital signal processing and transmission is shown in torque and temperature plots. The dynamic behaviour of this torque measurement system is analyzed and the results are used to develop a new high dynamic rotational torque...
XIX IMEKO World Congress
· TC3
· 2009
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Matthias Rückwardt, André Göpfert, Steffen Lerm, Maik Rosenberger, Mathias Schellhorn, Gerhard Linß
The field of quality assurance in the industrial production is closely connected to the precise measuring of the products. Several measuring methods are used, like optical, capacitive or tactile ones. There is perennially a pinch for time the measure each needed deviation in a little while, especial when a total inspection is necessary. Optical coordinate measuring machines are especially qualified for this aim, because of their possibility to acquire a lot of measuring points in one measuring step. Because of the blocked optical path, also these machines are finished when the device is...
XIX IMEKO World Congress
· TC8
· 2009
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