Precession vector based holographic on-spot dynamic balance method

An on-site dynamic balance and balance technology, which is applied in the static/dynamic balance test, measuring device, machine/structural component test, etc., can solve problems such as inability to judge and limit the rotor balance state, and achieve balance by avoiding multiple starts and stops Effects of testing, eliminating interference, and improving dynamic balance efficiency

Inactive Publication Date: 2009-11-18
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is not possible to judge whether the rotor balance state is good or bad based on the size of IPV, which limits its role to a certain extent.

Method used

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  • Precession vector based holographic on-spot dynamic balance method
  • Precession vector based holographic on-spot dynamic balance method
  • Precession vector based holographic on-spot dynamic balance method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0062] The experiment was carried out on the No. 1 rotor test bench of the applicant's research institute.

[0063] Purpose:

[0064] It is verified whether the counterweight scheme of this method has the same balance accuracy as that of the traditional balance method under the condition that the rotor stiffness is the same.

[0065] The layout of the test bench is shown in Figure (4). The test bench is a single-span double-support structure. In the figure 1_X, 1_Y, 2_X and 2_Y are the axial installation positions of the eddy current sensor; K is the key phase device; P 1 ,P 2 There are two weighted discs; when viewed from the motor drive end to the free end of the rotor, the rotor rotates counterclockwise. The first-order criticality of the rotor is around 2000r / min, the second-order criticality is around 8000r / min, and the working (balance) speed of the rotor is 4000r / min.

[0066] The main purpose of the experiment is to demonstrate that the counterweight scheme obtained...

example 2

[0089] An Example Analysis of On-site Dynamic Balancing of Flue Gas Turbine in a Refinery

[0090] Purpose:

[0091] Test the application of this method in the dynamic balance of the unit under the action of combined faults and its comparison with the "holographic dynamic balance method".

[0092] Figure 5 It is a schematic diagram of the structure of the flue gas turbine unit and the installation position of the sensor in an oil refinery. Section 1 is the front bearing of the hood, and section 2 is the rear bearing of the hood. In the figure, p is the film coupling position between the cigarette machine and the compressor. Due to the good vibration condition of the axial flow compressor and the elastic connection between the smoke machine and the compressor, the vibration on one side of the compressor was not considered in the process of solid vibration treatment. Figure 6 a is the three-dimensional holographic spectrum of the two supports at the front of the hood, and ...

example 3

[0102] This experiment was carried out on the No. 2 rotor balance test bench of our institute.

[0103] Purpose:

[0104] 1. Verify the balance effect of this method in combined faulty rotors, and compare it with the traditional balance method;

[0105] 2. To verify the reliability and validity of the equilibrium termination condition in this method.

[0106] The structure of the test bench, the arrangement of the sensors, the rotor steering, etc. are exactly the same as those of the No. 1 rotor balance test bench. between critical stages.

[0107] The main purpose of the experiment is to illustrate that the precession vector holographic balance method is not strictly dominant in the anisotropic stiffness of the system, or the rotor unbalance is not strictly dominant in the combination of faults affecting the rotor power frequency component vibration. Whether the balance scheme obtained by the method is significantly better than the scheme obtained from the information of t...

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Abstract

The invention discloses a holographic on-site dynamic balancing method based on a precession vector. Based on the theory of holographic spectrum, this method establishes an on-site dynamic balancing method for large generating units with the initial phasor of the positive precession trajectory of the rotor as the balance target through the precession decomposition of the unit's power frequency axis trajectory. It not only eliminates the interference caused by unbalanced faults on the imbalance estimation during the balancing process, but also improves the accuracy and efficiency of the balancing; it can further determine the termination condition of the dynamic balance of the large unit site according to the change of the precession ratio during the balancing process, which is beneficial to the improvement of the balance. The efficiency of on-site troubleshooting and the reduction of blindness in repeated balancing operations have extremely high application value. For rotors with anisotropic support stiffness commonly found in industrial sites, this method can effectively eliminate the influence of stiffness anisotropy on balance decision-making, and has a very wide range of applications.

Description

technical field [0001] The invention belongs to the technical field of rotor dynamic balance, and relates to fault diagnosis and control methods of rotating machinery, in particular to a holographic on-site dynamic balance method based on precession vectors, which can be used for qualitative separation of combined faults or rotor faults under the action of asymmetric support stiffness , the identification of unbalanced faults, the measurement and estimation of unit unbalanced quantities, the formulation of counterweight schemes (including size and direction), and the balance decisions made according to the balance termination conditions. Background technique [0002] The traditional dynamic balancing method, whether it is the rigid rotor dynamic balancing method or the flexible rotor dynamic balancing method - the modal balance method and the influence coefficient balance method, only uses the vibration signals of the unidirectional sensors on each vibration measuring surface...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M1/16
Inventor 廖与禾郎根峰吴芳基屈梁生
Owner XI AN JIAOTONG UNIV
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