Ship Design and Construction
Slavgorodskaya A., Molokov K., Kitaev M., Nemkin D.
ALEXANDRA V. SLAVGORODSKAYA, Ph.D., Associate Professor, Department of Aircraft and Helicopter, School of Engineering, Far Eastern Federal University, Vladivostok. 8 Sukhanova St., Vladivostok, Russia, 690950, e -mail: alexandri-s@yandex.ru
KONSTANTIN A. MOLOKOV, Ph.D., Assistant Professor, Department of Welding Engineering, School of Engineering, Far Eastern Federal University, Vladivostok. 8 Sukhanova St., Vladivostok, Russia, 690950, e -mail: spektrum011277@gmail.com
MAKSIM V. KITAEV, Ph.D. (Technics), Senior Lecturer, Department of Shipbuilding and Ocean Technique, School of Engineering, Far Eastern Federal University, Vladivostok. 8 Sukhanova St., Vladivostok, Russia, 690950, e -mail: maxkit@mail.ru
DMITRII V. NEMKIN, Ph.D. student, Department of Shipbuilding and Ocean Technique, School of Engineering, Far Eastern Federal University, Vladivostok. 8 Sukhanova St., Vladivostok, Russia, 690950, e-mail: dimasenchek@mail.ru
Sectorial linear geometrical features of a propeller blade based on computer models
The article presents of the authors’ computer-aided computation of integrated characteristics of contour sections for three-dimensional models (in particular, the geometrical characteristics of cylindrical sections of a propeller blade having a wavy surface or other three-dimensional objects with a complicated profile.) The geometrical characteristics of the sections when designing strength of framings of a girder type are determined in relation of their own axes. So, the obtained tension and movement values are considered in the direction of the principal axes and they need not be flat and follow the geometry of the object by the contour cross-sections. In the arbitrary frame of axis, the latters’ geometrical characteristic can be represented as a sum of corresponding characteristics of the triangles having the general top which is the beginning of coordinates. The possibilities of numerical and symbolical integration which are available in the Mathcad and MatLAB programs make it possible to determine the geometrical characteristics not only of the arbitrary sections, but those of the volumes as well. The algorithm can be applied to calculate the sectorial straight-line characteristics and the coordinates of the shear centre for asymmetrical and thin-walled sections of an open profile.
Key words: axial moment of inertia, sectional area, product of inertia, section’s contour, geometrical properties of sections, coordinate of shear centre, screw propeller.
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