Optimization of image synthesis for complex geometry objects in the robotic ultrasonic system
This paper is devoted to the optimization of image synthesis for complex shape objects in the robotic system of ultrasonic testing. The basis of this process is a preliminary analysis of the object with complex geometry to ensure reproducibility and accuracy of the tests in the specified range. It includes such stages as digital model creation, geometric surface analysis, creating of control points and vectors, searching for optimal model location, model verification on reachability, collisions and singularity.
INDUSTRIAL APPLICATION OF REAL-TIME 3 D IMAGING BY SAMPLING PHASED ARRAY
The “Sampling Phased Array” technique compared with the conventional phased array approach became very popular in the last years making use of the propagation of elementary waves (Huygens principle) generated by individual elements of the sensor array to reconstruct the composite phased array signal by high-speed numerical computation for any arbitrary, individual angle or physically possible focus depth. As the near field of each individual transducer in the array is that of a ‘quasi’ point source, transducer-near inspection regions are much better to inspect than in the conventional case where the near field is determined by the full aperture of the transducer array. Furthermore, the special IZFP-approach allows a very fast 3-dimensional visualization of inspection objects by combining slice by slice 2dimensionally calculated SAFT-B-images to a 3-dimensional data-cube with a manifold of possible data projections for evaluation and analysis of the inspection results. 3-D-SAFT algorithms taking into account also a modified transducer design with a wide-angular sound beam characteristic in each space direction are under development.
EFFECT OF SAMPLE PREPARATION ON WATER TREE RESISTANCE OF XLPE/SEBS BLENDS
The effects of an aromatic polymer, such as poly[styrene-b-(ethylene-co-butylene)b-styrene] (SEBS), and its preparation processes on water tree resistance, morphology, crystallinity, dielectric constant and dielectric loss tangent of crosslinked polyethylene (XLPE)/SEBS and XLPE/SEBS/ethylene vinyl acetate (EVA) blends were investigated. The XLPE/SEBS samples were characterized by means of differential scanning calorimetry, scanning electron microscopy, dielectric spectral analysis and the accelerated water treeing experiment. The results clearly showed that although SEBS was partially compatible with LDPE and it was dispersed evenly in XLPE matrix, the blends demonstrated excellent dielectric performances, such as dielectric constant and dissipation factor. The crystallinity of XLPE/SEBS blends was decreased with increase in SEBS content and it was further decreased with the addition of EVA. SEBS could effectively improve the water-tree resistance of XLPE and both SEBS and EVA were found to improve the water tree resistance of XLPE synergistically as expected. The differences in sample preparation processes could change the phase morphology and dielectric performance of the blends, and could also influence the dispersion of SEBS in XLPE matrix as well as the crystallinity of the blends. Different preparation processes led to different water tree resistance behaviours of the samples. The improvement of SEBS dispersion in XLPE matrix helped to improve the water tree resistance of XLPE.