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Radial oil film bearing dynamic mesh updating method based on Fluent

An update method, technology of oil film bearings, applied to bearings, liquid cushion bearings, shafts and bearings, etc., can solve problems such as excessive aspect ratio of bearing oil film grids, distortion of dynamic grids, etc.

Inactive Publication Date: 2017-10-20
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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Problems solved by technology

[0009] In order to solve the problem in the prior art that the aspect ratio of the bearing oil film grid is too large and the grid distortion easily occurs in the dynamic grid, the present invention provides a dynamic grid update method for radial oil film bearings based on Fluent

Method used

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  • Radial oil film bearing dynamic mesh updating method based on Fluent
  • Radial oil film bearing dynamic mesh updating method based on Fluent
  • Radial oil film bearing dynamic mesh updating method based on Fluent

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Embodiment Construction

[0044] The technical solution of the present invention will be further described in conjunction with the embodiments.

[0045] The structure diagram of the vibration control structure of the bearing bush by the exciter is as follows: image 3 shown. The movement of the bearing pad is controlled by a displacement exciter, and the influence of the amplitude and phase of the exciter on the trajectory of the rotor axis is investigated. The parameters of the calculation example are shown in Table 1.

[0046] Table 1 Physical parameters of bearings, rotors and lubricating oil

[0047]

[0048] Such as Figure 1-4 As shown, the mesh node update in the Fluent software dynamic mesh update process is determined according to the displacement of the journal and bearing pad. The core of the grid update method is the algorithm for solving node coordinates. The schematic diagram of the grid node solution is as follows: figure 2 shown. Based on a Fluent-based radial oil film bearing...

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Abstract

The invention provides a radial oil film bearing dynamic mesh updating method based on Fluent. The method comprises the following steps that (1), a bearing oil film mesh file is established; (2), a UDF control macroprogram in Fluent software is compiled; (4) a data file obtained in the third step is treated with an Excel tool; (5) fluid calculation software Fluent is started, the mesh file is imported, a UDF program is mounted, and UDF control conditions are set; (6), flow field calculation is controlled through a UDF dynamic mesh program; and (7) whether a bearing neck center track is convergent or not is judged. According to the radial oil film bearing dynamic mesh updating method based on the Fluent, the problem that due to the fact that the length-width ratio of bearing oil film meshes is too large, mesh distortion is prone to occur in the dynamic mesh moving process is solved, and equal-interval distribution, in the circumferential direction, of mesh lines in the radial direction before and after the moving process is guaranteed. When the method is used for calculating node coordinates of dynamic meshes, the mesh lines are always perpendicular to the bearing neck surface, the meshes are not prone to distortion, accumulated errors of mesh calculation are avoided, and the bearing performance calculating speed is increased.

Description

technical field [0001] The invention belongs to the technical field of performance calculation of an oil film bearing and a rotor system thereof, and in particular relates to a dynamic mesh update method of a Fluent-based radial oil film bearing. Background technique [0002] When calculating the dynamic performance of oil film bearings, the center of the journal of the rotor is whirling, and the absolute speed and acceleration of each point on the surface of the journal are different. The shape and kinematic parameters of the calculated flow field are changing all the time, and the static grid model cannot be used. calculate. The dynamic grid model can be used to simulate the change of the watershed over time due to boundary movement, and is applicable to both single-phase flow and multi-phase flow. Boundary motion can be a prescribed action (for example, the user can define the velocity and angular velocity of the rigid body center), or it can be an action that needs to b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C32/06G06F17/50
CPCF16C32/0629G06F30/20
Inventor 吴超尹雪梅李蒙蒙朱茹敏马明飞李立伟任菲郭志强杨春燕巩晓赟张德海崔晓康
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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