Abstract
The work investigates the bearing piece boundary conditions influence on the shaft line operating state, with respect to elastic properties of stern-tube bearings. It is noted that the shaft line is a part of the ship’s power plant and it is a shaft system, located on the same axis. Performance criterion is the deflection of the concentrated load in the design scheme`s action point, modeling the propeller`s weight, bearing parts reactions and the natural frequency of linear lateral oscillations. The design scheme itself is a beam, resting on two elastic supports with a k stiffness factor, with concentrated load acting on the one end and three variants of the boundary conditions: pinched, hinged and sliding supports on another one. The results of calculations are given for different boundary conditions and the stiffness factors of elastic supports. The diagram of natural frequencies of linear lateral oscillations of ship`s shafting line is presented.
Highlights
Shaft line is a part of the ship's power plant and it is a shaft system, located on the same axis
- the pinched support at the beams end is replaced by a hinged-fixed support; - when calculating a beam on elastic supports, the 5 moments equation is used; - when calculating transverse vibrations, only the stern part of the ship is taken into account, since it is the most loaded part of ships shaft line and has the lowest natural frequency
The stiffness factor of two elastic supports varied in range from 1·106 N/m to 1·1010 N/m
Summary
Shaft line is a part of the ship's power plant and it is a shaft system, located on the same axis. There are a number of constant, variable and random loads acting on the ships shaft line while in operation [1, 2]. In the shaft lines design, static and dynamic calculations are performed to determine deformations and stresses from bending in sections, loads on its supports, and determine the main parameters of torsion, longitudinal and transverse vibrations. - the pinched support at the beams end is replaced by a hinged-fixed support; - when calculating a beam on elastic supports, the 5 moments equation is used; - when calculating transverse vibrations, only the stern part of the ship is taken into account, since it is the most loaded part of ships shaft line and has the lowest natural frequency. The propeller shaft section includes the propeller, the propeller shaft console, the stern tube bearing, the propeller shaft nose or part of the intermediate shaft (depending on the shafting design)
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