Alignment computing method of propeller shaft system of ship

Abstract

The invention discloses an alignment computing method of a propeller shaft system of a ship. The method comprises the steps that firstly, loads of all supports and load influence coefficients of the propeller shaft system under the linear alignment state are computed; radial displacement values of all oil-lubricated bearings are selected to serve as design variables; two optimized objective functions are defined, according to one function, the standard deviation of the loads of the supports of the same type or the adjacent supports is minimum, and according to the other function, the bearing reaction of a rear-axle frame bearing is minimum; limiting conditions of the propeller shaft system on the aspects of design, intensity, stress, geometrical characteristics and the like are defined to constitute a feasible solution domain space; finally, the optimal radial displacement value of the supports is solved based on the multi-objective optimization method. The method overcomes the defect that when a ship propeller shaft system is aligned in the prior art, only a single optimization target is considered, and the defects caused by the multi-objective optimization solution. The method improves the reasonability of multi-objective optimization computation in the propeller shaft system, is simple, reliable and easy to implement, and has practicability.

Description

[0001] technical field [0002] The invention relates to the technical field of ship propulsion systems, in particular to a ship propulsion shaft alignment calculation method. [0003] Background technique [0004] The propulsion shafting is an important part of the ship's propulsion system, which directly affects the operation of the propulsion system and the safety and reliability of the ship's navigation. Propulsion shafting with poor alignment quality will cause bearing wear to increase, and in severe cases, it will even cause sintering of bearing friction pairs, leakage of stern tube sealing elements, and increased vibration of the stern of the hull, etc. Excellent shafting alignment should balance bearing load, reasonable stress distribution of shaft section, and excellent control of shafting deflection and rotation angle. Therefore, it is necessary to apply the idea of ​​multi-objective optimization to carry out shafting alignment design. [0005] The alignment prob...

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Problems solved by technology

Literature [4] (Lu Xi, Chen Zhiyan. The application of multi-dimensional space grid division in the rational calibration of ship shafting [J]. Ship Mechanics, 2002, 6(5): 66-69) proposed a shafting multi-objective The optimal calculation method divides the grid in the feasible solution domain space, and then calculates the results of each grid point and makes a comprehensive comparison to obtain the optimal solution. The problem is that if the grid division is too large, the calculation cost Too high; if the mesh division is too small, the optimal alignment calculation result cannot be obtained

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