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 resolutions. The metered characteristics will be coordinate transformed to extrinsic world-coordinates for evaluating form deviations of complex parts. An appropriate user-interface enables to re-calculate measurement objects in-line and evaluate the conformity of the part consequently. Finally the real length information assists to influence the process control. After successful test in laboratory the results will be proved in production to the target: measurement uncertainty of better 0.1 mm at every profile.

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 numerical simulation considering the uncertainties and an illustrative calculation will be discussed.

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.

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 by the reactive loads. Results of this analysis show that reactive phenomenon in three-phase power systems can be compensated by single or three-phase capacitor banks, but undesirable effects on the system efficiency are consequence of the unbalance phenomenon and they can be increased by an inadequate reactive-compensator topology. It can have unbalance power due to the reactive loads even thought the reactive power has been compensated.

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 located behind an undercut. This is for example the case by the ground of a groove on the inside of a cylinder. Then it is necessary to deflect the beam of the machine as you can see in Fig. 1.
That is the reason why the Department of Quality Assurance from the Faculty of Mechanical Engineering of the Technical University of Ilmenau promoted by the Federal Ministry of Economics and Technology within the framework of the InnoNET program is researching for a new procedure for detecting deviations behind an undercut by using optical coordinate measuring machines. Therefore several possibilities for beam deflexion, illuminations scenes, foci criteria, minimum of detecting field and the needed optical magnification were discussed.