Multiple fluid-solid coupling calculation method for tail bearing-rotor system

Abstract

The invention discloses a multiple fluid-solid coupling calculation method for a tail bearing-rotor system, and belongs to the technical field of fluid-solid coupling of ocean platforms. The method involves a plurality of tail bearings and a propeller shaft, and comprises the steps of setting a step length of unit time and total calculation time, discretizing a fluid domain unit, discretizing a solid domain unit, calculating a discretized fluid domain, calculating a discretized solid domain, performing data coupling calculation, and ending the calculation. According to the multiple fluid-solid coupling calculation method for the tail bearing-rotor system, accurate simulation of a working process of the tail bearing and rotor system is realized, and the problem of low fluid domain calculation precision caused by excessively large mesh distortion in application of an existing dynamic mesh technique to spatial regions occupied by the tail bearings to perform numerical simulation is solved; and multiple fluid-solid coupling calculation is realized, the defects of coupling calculation of a symmetric bearing-rotor system are overcome, and multiple coupling effects, between vibration and lubrication, of the propeller shaft and the tail bearings can be accurately simulated.

Description

technical field [0001] A calculation method for multiple fluid-solid coupling of a stern bearing-rotor system belongs to the technical field of fluid-solid coupling of offshore platforms. Background technique [0002] As the focus of oil research and exploration work gradually shifts from land and shallow seas to deep seas, the application of offshore platforms continues to expand. Offshore platforms are divided into fixed type, movable type and semi-fixed type according to structural characteristics and working status. The propeller is one of the key components of the ocean floating platform. The ocean floating platform relies on its own buoyancy to support its platform weight, and uses the propeller to dynamically position the platform. The propeller shaft is the tail shaft of a large ship system with a complex shaft system. The tail bearing at the tail supports the operation, and the reaction force generated by its operation resists the forces of wind, waves, currents, e...

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Problems solved by technology

Therefore, it is of great significance to study the fluid-solid coupling calculation method of the stern bearing-rotor system under an asymmetric flow field for the long-term safety work of offshore platforms; The production of foreign products is not strong in independent design, and the simulation foundation of multi-field coupling work process is weak and there are various problems, which cannot provide technical support for my country's in-depth development of navigation and positioning power systems for deep-sea drilling floating platforms with independent property rights

[0003] In the process of realizing the present invention, the inventor found that there are at least the following problems in the prior art: 1. The numerical simulation of the working process of the tail bearing and the propeller shaft system is not accurate; 2. The fluid in the fluid-solid coupling process of the tail bearing-rotor system 3. The fluid-solid coupling process of the tail bearing-rotor system cannot accurately reveal the coupling mechanism between the propeller shaft and multiple tail bearings between vibration and lubrication

[0005] 1. The existing fluid-solid coupling technology uses large-scale CAE software to perform unified calculation and processing of the discretized data in the fluid domain and solid domain, resulting in inaccurate numerical simulation of the working process of the tail bearing and propeller shaft system;

[0006] 2. Existing fluid domain calculations using dynamic grid technology for stern bearing numerical simulation have the problem of excessive grid distortion;

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