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Sliding bearing rigidity recognition method based on mill vibration mode parameters

A sliding bearing and vibration mode technology, which is applied in the field of system parameter identification, can solve the problem of large influence on the calculation results of the mode, and achieve the effect of improving model accuracy and calculation efficiency

Inactive Publication Date: 2017-01-25
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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Problems solved by technology

However, in the preliminary calculation and analysis process of the mill, it was found that different combinations of stiffness values ​​have a great influence on the modal calculation results

Method used

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  • Sliding bearing rigidity recognition method based on mill vibration mode parameters
  • Sliding bearing rigidity recognition method based on mill vibration mode parameters
  • Sliding bearing rigidity recognition method based on mill vibration mode parameters

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Embodiment Construction

[0025] The present invention utilizes a Φ7.32×12.5m ball mill. The parts include foundation, fixed-end sliding bearing, free-end sliding bearing, cylinder, and large gear. The finite element components include 86164 3D units and 15603 2D Units, 660 rod units and 3805 point units; the specific steps are as follows:

[0026] 1) Establish the overall finite element model of the mill and perform modal calculations; in the finite element software of MSC.PATRAN&MSC.NASTRAN, the oil film is simplified into multiple rows of equivalent spring units, which have radial and tangential directions under the corresponding cylindrical coordinates. , Stiffness values ​​in three axial directions;

[0027] 2) Design the test plan; use the PCB low-frequency three-way sensor to measure the vibration signal of the mill, input the signal to the OROS data acquisition instrument, and finally transmit it to the computer and record it; the determination of the position of the measuring point and the dir...

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Abstract

The invention discloses a sliding bearing rigidity recognition method based on mill vibration mode parameters. The method comprises the specific steps of 1, building a mill full finite element model; 2, designing a testing scheme; 3, utilizing operational modal analysis for recognizing modal parameters; 4, calculating a modal confidence factor analysis correlation; 5, selecting and calculating a modal confidence factor larger than 0.7, and adopting an axial rigid body modal, a radial rigid body modal and the like as main modals to be recognized; 6, selecting sliding bearing rigidity as parameters to be recognized; 7, constructing a target function; 8, performing iterative optimization, wherein the overall calculation efficiency and model precision of a mill can be improved through the recognition method, so that the model is closer to the actual structure, and due to accurate oil film rigidity recognition, later model-based response calculation, prediction and damage recognition are promoted.

Description

technical field [0001] The invention belongs to the field of system parameter identification, in particular to a sliding bearing stiffness identification method based on mill vibration mode parameters. Background technique [0002] For the mill system, the oil film stiffness of the main bearing is an important parameter for the overall dynamics modeling and response analysis of the mill. It reflects the ability of the oil film to resist load changes and the rate of change of the relative displacement of the bearing capacity, which is related to the bearing capacity of the bearing and the thickness of the oil film. At present, the research on the stiffness of the mill's hydrostatic main bearing is focused on improving the bearing capacity through the optimization of the oil cavity structure, and the method of fluid computational mechanics is mostly used. This type of method calculates the pressure distribution of the flow field through numerical simulation, thereby deriving ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20G06F2111/10
Inventor 郭勤涛陆倩玲王钢平徐振华郭伟展铭
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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