Flexible magnetic levitation bearing rotator rigidity damping identification method

A technology of magnetic suspension bearing and identification method, which is applied in the direction of mechanical bearing testing, measuring devices, instruments, etc., can solve the problems of rotor bending deformation, increase in identification error of magnetic suspension bearing stiffness damping, etc.

Active Publication Date: 2017-01-04
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0004] The above method is only applicable to the rigid maglev bearing rotor model under ideal conditions without interference force, so it has two disadvantages: (1) When the rotor itself has a large residual unbalance or there is interference such as motor interference force, the stiffness of the maglev bearing The damping identification error increases sharply; (2) When the rotor speed is close to the bending critical speed, the rotor produces obvious bending deformation, and the stiffness damping identification error of the magnetic suspension bearing increases sharply

Method used

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  • Flexible magnetic levitation bearing rotator rigidity damping identification method
  • Flexible magnetic levitation bearing rotator rigidity damping identification method
  • Flexible magnetic levitation bearing rotator rigidity damping identification method

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Experimental program
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Effect test

Embodiment approach 1

[0110] Embodiment 1, simulation calculation identification:

[0111] 1.1 Using Nelson-Timoshenko beam element, figure 1 It is the magnetic suspension bearing rotor coordinate system diagram. There are two left and right magnetic suspension bearings. The control force of each magnetic suspension bearing is decomposed into two directions of x and y that are perpendicular to each other. The K and C distributions represent stiffness and damping, and their subscripts indicate the directions of stiffness and damping. according to figure 1 Establish the rotor model of the flexible magnetic suspension bearing in the rotor coordinate system; set the support positions of the left and right magnetic suspension bearings to be located at node 20 and node 40 of the rotor finite element model, as shown in Figure 6 As shown; assuming that the stiffness and damping provided by the two magnetic suspension bearings are shown in Table 1. It is assumed that the disturbance force is the residua...

Embodiment approach 2

[0125] Embodiment 2, test identification:

[0126] 2.1 Add unbalanced mass to the magnetic bearing rotor, such as Figure 6 Shown; the specific information of the unbalanced quality is shown in the table;

[0127] Table 4 The unbalanced mass added in the test

[0128]

[0129] 2.2 Run the magnetic suspension bearing rotor system, starting from the speed of 50Hz, collect the displacement data at the magnetic suspension bearing every 10Hz; at the same time collect the rotor speed data.

[0130] 2.3 Fit the collected data with the first-order Fourier series through zero-phase filtering, and fit into the following formula:

[0131] y=a 0 +a 1 cos(xω)+b 1 sin(xω), (19)

[0132] At this time, the amplitude A and phase of the vibration The data can be obtained by the following formula, where is the rotational speed phase value,

[0133]

[0134] The experimental displacement vibration amplitude and phase data obtained at this time are as follows: Figure 7 shown;

...

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Abstract

The invention discloses a flexible magnetic levitation bearing rotary rigidity damping identification method, and belongs to the technical field of magnetic levitation bearing dynamic feature identification. The method comprises the following steps: firstly, acquiring two groups of independent magnetic levitation bearing rotor system rotation responses, namely, responses added with unbalance masses and responses not added with any unbalance mass; acquiring amplitude and phase data of two groups of independent responses by first-order Fourier series fitting; subtracting corresponding amplitude and phase data from the two groups of responses to eliminate interference force influence in the rotating process of a magnetic levitation bearing rotor subsystem; calculating amplitude and phase data from which the interference force influence is eliminated through a matrix inverse transformation recognition algorithm to obtain a magnetic levitation bearing rigidity damping dynamic feature. Compared with the prior art, the method has the advantages of high resolving accuracy and high interference resistance, is suitable for rigidity rotors below a bending critical rotation speed, and is suitable for flexible rotors over a bending critical rotation speed.

Description

technical field [0001] The invention discloses a method for identifying rotor stiffness and damping of a flexible magnetic suspension bearing considering the influence of disturbance force, and belongs to the technical field of identification of dynamic characteristics of magnetic suspension bearings. Background technique [0002] Magnetic suspension bearings have the advantages of no lubrication, no friction, and high-speed and efficient operation. It has been widely used in rotating mechanical equipment such as steam turbines, centrifuges and aero-engines. Accurately obtaining the stiffness and damping value of the magnetic suspension bearing is the basis of the rotor dynamics calculation of the magnetic suspension bearing, including critical speed calculation, unbalance response analysis, mode shape calculation, stability analysis, etc. Therefore, the stiffness and damping identification of magnetic suspension bearings is of great significance. [0003] Before the prese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/04
CPCG01M13/045
Inventor 周瑾徐园平金超武
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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