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A Holographic Diagnosis Method of Rotating Machinery Based on Frequency Modulation Information Reconstruction

A technology of rotating machinery and diagnostic methods, which is applied in the testing of mechanical components, testing of machine/structural components, measuring devices, etc. It can solve problems such as the inability to directly obtain torsional vibration signals of rotating equipment, achieve intuitive and complete diagnostic results, and improve utilization The effect of efficiency and hardware cost saving

Active Publication Date: 2018-03-13
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since most of the rotating equipment operating on site is not equipped with torsional vibration measurement devices, it means that the torsional vibration signal of the rotating equipment cannot be directly obtained

Method used

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  • A Holographic Diagnosis Method of Rotating Machinery Based on Frequency Modulation Information Reconstruction
  • A Holographic Diagnosis Method of Rotating Machinery Based on Frequency Modulation Information Reconstruction
  • A Holographic Diagnosis Method of Rotating Machinery Based on Frequency Modulation Information Reconstruction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1, using the dynamics simulation signal of the rotor system for verification, and establishing the finite element model of the rotor system such as figure 1 As shown, the dynamic and static rubbing fault of the rotor is caused by the unbalance of the rotor. The dynamic and static rubbing fault simulation is carried out by changing the dynamic and static spacing. The basic parameters of the finite element model of the rotor system are shown in Table 1.

[0052] Table 1 Basic parameter table of the finite element model of the rotor system

[0053]

[0054] The element stiffness matrix, element mass matrix, and element gyro force matrix of the rotor system are as follows:

[0055] The element stiffness matrix is:

[0056]

[0057]The element mass matrix is:

[0058]

[0059] The unit gyro force matrix is:

[0060]

[0061] A method for holographic diagnosis of rotating machinery based on frequency modulation information reconstruction, comprising ...

Embodiment 2

[0089] Example 2, through the Bentley RK4 rotor test bench for experimental verification, the structure diagram of the Bentley RK4 rotor test bench is as follows Figure 4 As shown, the diameter of the rotor is 10mm, the length is 550mm, and the front and rear support span is 325mm. Viewed from the driving end, the rotor system rotates in the counterclockwise direction, and two balancers for adding balance mass are arranged axially symmetrically in the rotor span. Disk, each disk weighs 0.8kg, 16 holes are equiangularly distributed along the circumference of the balance disk at a radius of 30mm for adding balance mass, the experiment simulates the dynamic and static friction fault of the rotor by adjusting the distance between the friction rod and the rotor, the experiment The rev is set at 1700rpm.

[0090] A method for holographic diagnosis of rotating machinery based on frequency modulation information reconstruction, comprising the following steps:

[0091] Step 1: Instal...

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Abstract

A holographic diagnostic method for rotating machinery based on frequency modulation information reconstruction. First, two displacement sensors with an angle of 90° are installed on the rotor vibration test section to collect displacement vibration signals in the X and Y directions, and the empirical model is used to collect the displacement vibration signals. EEMD is decomposed to obtain a plurality of basic mode components IMF, and then the spectrum analysis is performed on each basic mode component IMF, and the basic mode components IMFx(t) and IMFy(t) including frequency conversion are selected; respectively, the basic mode components IMFx(t) and IMFy(t) using the direct orthogonal method to calculate the instantaneous frequency IFx(t) and IFy(t), extract the frequency, amplitude and phase information of the instantaneous frequency IFx(t) and IFy(t), and synthesize a two-dimensional hologram Spectrum, to effectively identify the operating state of the rotor, the invention comprehensively considers the vibration signal of the rotor in the horizontal and vertical directions, and makes full use of the phase information, organically integrates the frequency, amplitude and phase information of the signal, and the diagnosis result is intuitive whole.

Description

technical field [0001] The invention relates to the technical field of fault diagnosis of rotating machinery, in particular to a holographic diagnosis method of rotating machinery based on reconstruction of frequency modulation information. Background technique [0002] Large rotating machinery is the key equipment in many industries such as petroleum, chemical industry, energy and metallurgy, among which the rotor assembly is the core of the rotating machinery. The common faults of rotors include unbalance, dynamic and static rubbing, oil film whirl, etc. Among them, the vibration caused by rotor dynamic and static rubbing faults often shows nonlinear characteristics, which is a kind of fault form that is difficult to diagnose. Some existing signal analysis methods are often unable to accurately and intuitively judge the operating state of the rotor, especially for the diagnosis of early weak faults. [0003] The vibration caused by the dynamic and static friction of the r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M13/00
CPCG01M13/00
Inventor 王琇峰郭美娜曾志豪林京雷亚国赵明
Owner XI AN JIAOTONG UNIV
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