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Wyszukujesz frazę "S-curve method" wg kryterium: Temat


Wyświetlanie 1-3 z 3
Tytuł:
Diagnostic moiré image evaluation in spinal deformities
Autorzy:
Balla, P.
Manhertz, G.
Antal, A.
Powiązania:
https://bibliotekanauki.pl/articles/173236.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Moiré method
image processing
Scheuermann’s disease
curve determination
Opis:
This paper deals with moiré picture evaluation in case of a very frequent spinal deformity, called the Scheuermann’s disease. Spinal deformities often occur in the group of 10–17 year-old children. This Scheuermann-type of spinal deformity is more frequent (11%) than the well-known scoliosis (2–4%), but because of the incorrect diagnosis it often remains without a right treatment. Now the accepted medical diagnostic method is using frontal and lateral X-ray pictures from patients’ back. Our already presented method uses moiré pictures to establish the right diagnosis. This optical method is fast, non-contact and arbitrarily repeatable. In our former paper we presented two computer algorithms to produce the shape of the patients’ spine. These methods showed good agreement with the traditional medical diagnosis, but the extreme search method returned better results. In this paper we are demonstrating our new results using the extreme search method and the improved computer program.
Źródło:
Optica Applicata; 2016, 46, 3; 375-385
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Verification of analytical models of the S-N curve within limited fatigue life
Autorzy:
Strzelecki, P.
Sempruch, J.
Powiązania:
https://bibliotekanauki.pl/articles/279631.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
fatigue design
S-N curve
high-cycle fatigue
accelerated method
Opis:
This paper presents analytical methods for determination of the curve for a high-cycle fatigue. It has been found based on qualitative and quantitative verification that the error introduced by these methods can be as large as 3-fold length of the experimental life. In addition, the wrong result can lay on either the safe or the unsafe side with equal probability. Therefore, an analytical-and-experimental (hybrid) method has been proposed. Verification of computed characteristics vs. experimental data demonstrated that the “proprietary” proposal reduced the error. In addition, an approximate error depending on the number of experiments has been determined based on the computations.
Źródło:
Journal of Theoretical and Applied Mechanics; 2016, 54, 1; 63-73
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Linear and geometrically non-linear frequencies and mode shapes of beams carrying a point mass at various locations. An analytical approch and a parametric study
Autorzy:
Adri, A.
Benamar, R.
Powiązania:
https://bibliotekanauki.pl/articles/329670.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
non-linear vibration
Hamilton’s principle
Newton-Raphson method
backbone curve
second formulation
drgania nieliniowe
zasada Hamiltona
metoda Newtona-Raphsona
analiza modalna
Opis:
In the present paper, the frequencies and mode shapes of a clamped beam carrying a point mass, located at different positions, are investigated analytically and a parametric study is performed. The dynamic equation is written at two intervals of the beam span with the appropriate end and continuity conditions. After the necessary algebraic transformations, the generalised transcendental frequency equation is solved iteratively using the Newton Raphson method. Once the corresponding program is implemented, investigations are made of the changes in the beam frequencies and mode shapes for many values of the mass and mass location. Numerical results and plots are given for the clamped beam first and second frequencies and mode shapes corresponding to various added mass positions. The effect of the geometrical non-linearity is then examined using a single mode approach in order to obtain the corresponding backbone curves giving the amplitude dependent non-linear frequencies.
Źródło:
Diagnostyka; 2017, 18, 2; 13-21
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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