On the issue of determining propeller shaft deflections
https://doi.org/10.46845/1997-3071-2024-74-136-150
Abstract
The article discusses the problem of calculating the deflection of the propeller shaft, in accordance with the requirements of the Rules of the Russian Mari-time Register of Shipping (hereinafter referred to as RMRS). Using the example of a propeller shaft of a separate vessel, a calculation diagram has been drawn up, and a calculation has been performed using the finite element method using the software (hereinafter referred to as the software) “Femap with NX Nastran”. It is shown that the calculation by the finite element method cannot be recognized as RMRS. Two main methods have been identified that can be used to obtain an approved RMRS calculation: using approved software or direct analytical methods, taking into account the requirements of the relevant regulatory documents. Software that has a standard certificate of approval by RMRS for performing such calculations has been studied, and it has been found that currently such software does not exist. A scheme is considered for calculating the deflection of the propeller shaft using the direct analytical method. Expressions are obtained for determining loads, axial moments of inertia of cross sections and bending moments at each section. It is noted that compiling an expression for bending moments and its double integration for a section with a variable cross-section that varies along its length is labor-intensive and requires the use of computer technology. A simplified calculation method (in two versions) has been proposed, which consists in replacing a section of a shaft with a variable cross-section with a section with a constant cross-section, which significantly simplifies the calculations by the direct analytical method. According to the results obtained, the corresponding replacement of the shaft section leads to some insignificant errors: no more than 0.1% in the calculations of deflections and angle of rotation, which is acceptable, according to regulatory documents. It is emphasized that the proposed assumption may have limitations in application, which will be investigated by the authors in subsequent works.
About the Authors
D. A. Romanyuta
Kaliningrad State Technical University
Russian Federation
Russian Federation
Dmitriy A. Romanyuta – chief designer of the design bureau of the shipbuilding research center, graduate student of the department of “Shipbuilding, ship repair and marine technology”
Kaliningrad
A. S. Arienchuk
Kaliningrad State Technical University
Russian Federation
Russian Federation
Aleksey S. Arienchuk – student
Kaliningrad
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Review
For citations:
Romanyuta D.A., Arienchuk A.S. On the issue of determining propeller shaft deflections. KSTU News. 2024;(74):136-150. (In Russ.) https://doi.org/10.46845/1997-3071-2024-74-136-150
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