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EN
Bjork Shiley Convexo Concave (BSCC) heart valve is a special type of the mechanical heart valve which was implanted to many patients worldwide. In some cases, for reason yet unclear the outlet strut - weld fractured after several years of use. This type of fracture usually causes a malfunction of the valve what is incompatible with further life. For this reason a new approach for the inspection is proposed based on sweep frequency eddy current testing. Standard self inductance pancake probe drives the eddy currents and pick-ups the response signals. Numerical simulations and experimental measurement are carried out to evaluate the proposed technique. The gained results presented in the paper show that there is an evident difference in the amplitude frequency spectrum of the response signal between the intact valve and the one with a single leg fracture of the outlet strut.
PL
Zastawka Bjork-Shiley’a (BSCC) to mechaniczny implant zastawki serca, masowo stosowany na całym świecie. W niektórych zastawkach z nieznanego dotychczas powodu dochodzi po kilku latach od operacji do pęknięcia zewnętrznego wspornika zaworu. Ten rodzaj uszkodzenia powoduje zazwyczaj wadliwe funkcjonowanie zastawki. W artykule zaproponowano nowe podejście do inspekcji kondycji zastawki z wykorzystaniem testowania nieniszczącego przy pomocy prądów wirowych z przemiataniem częstotliwości. W celu oceny zaproponowanej metody wykonano symulacje numeryczne i pomiary eksperymentalne. Rezultaty zaprezentowane w artykule pokazują wyraźną różnicę w odbieranych sygnałach pomiędzy sprawną zastawką, a zastawką z uszkodzonym pojedynczym ramieniem wspornika.
2
Content available remote Viscoelasticity measurement of skin in vivo by rheometer
EN
Purpose: The pressure sore is a trouble by the mechanical loading. As for this, the stress concentration occurs to the skin surface, and, next, sphacelation is meant by the skin. However, there is a case where the pressure sore is not improved even if the stress is removed. For this case, defective fixation of the skin is more remarkable than the general person. In this research, the appraisal method was quantitatively proposed for the soundness of the skin. Design/methodology/approach: This paper proposed the model of the mechanism where the skin received the shear stress and the pressure sore was generated. To verify this model experimenting, it examined it in pathology. Findings: The experimental results showed that first of all, to measure the viscoelastic property of the skin with in vivo, the measuring instrument using the rheometer was developed. Next, it made comparative study with the state of pathology of the pressure sore with this measuring instrument. As a result, it was able to be suggested that defective fixation of the skin decide the form of the pressure sore. In addition, it has understood though the state of the therapeutic approach and the prognosis can be evaluated. Research limitations/implications: In this research, the skin was measured using the probe and the rheometer which devised the stage. At this time, the datum point of the rheometer measured by assuming in the bone upper part. Practical implications: This paper cleared that it is influence of the measurement place of a skin viscoelasticity value. As a result, it was suggested that the preventive care of the bedsore becomes possible. Originality/value: The objective of this research project was to develop the skin appraisal method was quantitatively proposed.
3
Content available remote The complete measurement system for crack detection and identification
EN
In this paper authors present automatic system for crack detection and identification. The eddy current multifrequency method was used for crack detection. The depth of cracks was modeled by neuro-fuzzy network.
PL
Autorzy prezentują kompletny automatyczny system do nieniszczącej identyfikacji (i wykrywania) uszkodzeń za pomocą prądów wirowych. System wykorzystuje wieloczęstotliwościowy system detekcji uszkodzeń i diagnozuje głębokość pęknięcia z wykorzystaniem rozmytych sieci neuronowej.
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