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Magnetic suspension shaft system falling track recognition and resuspension control method and device

A magnetic levitation shaft and re-suspension technology, which is applied in the direction of measuring devices, mechanical bearing testing, mechanical component testing, etc., can solve unsolved problems

Active Publication Date: 2017-09-29
TSINGHUA UNIV
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Problems solved by technology

[0005] The above two articles proposed two methods of how to identify the three typical trajectory responses, but did not solve the key issue of how to achieve rapid resuspension after the shafting of the magnetic suspension bearing falls to reduce damage to the shafting and protect the bearing

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  • Magnetic suspension shaft system falling track recognition and resuspension control method and device
  • Magnetic suspension shaft system falling track recognition and resuspension control method and device
  • Magnetic suspension shaft system falling track recognition and resuspension control method and device

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Embodiment Construction

[0107] The present invention proposes a method and device for controlling the falling track identification and resuspension of the magnetic levitation shaft system. The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0108] Such as Figure 1-6 An embodiment shown, s is 1.5×10 in the described embodiment -4 m, the acceleration g is 9.8m / s 2 , then use the frequency f 0 is 40.68Hz, and the sampling period L is 0.025s; the frequency β of free-falling clock pendulum vibration is 40.68Hz; the mass of the shafting is 11.5kg, the initial velocity of the shafting is 16000r / min, and the surface friction between the shafting and the inner ring of the protective bearing The coefficient is 0.2. Assume that the magnetic bearing suddenly fails within 0-0.225s, and the shafting falls freely; this control method restores the magnetic bearing to normal operation after 0.225s.

[0109] Such as Figure 1-6 As shown, in this em...

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Abstract

The invention discloses a magnetic suspension shaft system falling track recognition and resuspension control method and device, and belongs to the technical field of magnetic suspension bearings. The method includes the steps: calculating the sampling period of shaft system displacement signals; monitoring the suspension state of a shaft system; acquiring discrete time domain displacement signals of the shaft system; acquiring instantaneous frequency spectrum signals by Hilbert transformation; comparing expected values of radial displacement signals of the shaft system within the sampling period and expected values of instantaneous frequency of shaft system displacement with threshold values, determining track response of the shaft system and further proposing corresponding control strategies. When all-round friction happens, the swirl frequency of the shaft system can be effectively reduced, damage to the magnetic suspension bearings is reduced, resuspension of the shaft system is realized, vibration energy of the shaft system can be reduced when high-frequency swing happens, and the shaft system is effectively protected. According to the method, movement track response of the shaft system is judged only by displacement signals of the shaft system, the signals are easily acquired, and instantaneity, simplicity and convenience are simultaneously achieved.

Description

technical field [0001] The invention belongs to the technical field of magnetic suspension bearings, and in particular relates to a control method and device for identifying and resuspension of a magnetic suspension shafting fall track. Background technique [0002] The application of magnetic bearings in the field of rotating machinery is increasing year by year. Magnetic suspension bearings can provide non-contact support, especially suitable for use in high-speed, low-loss, and low-noise situations, and the stiffness and damping of magnetic suspension bearings can be adjusted. When the magnetic levitation shafting falls at high speed, violent collision and friction will occur between the shafting and the protective bearing, which will cause great damage to both the shafting and the protective bearing. ISO 14839 defines three typical trajectory responses of maglev shafting after falling, including: pendulum vibration, mixed friction and bounce, and full-circle friction. ...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06F17/15G01M13/04
CPCG01M13/045G06F17/156G06F30/20
Inventor 吕民东刘涛王子羲郭飞贾晓红王玉明
Owner TSINGHUA UNIV
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