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Rotating machinery shaft torsion vibration fault monitoring method under variable frequency speed regulation driving

A technology for shafting torsional vibration and rotating machinery, which is applied in the testing of mechanical parts, the testing of machine/structural parts, and measuring devices, etc. It can solve the problems of high requirements for equal parts, complex signal extraction and analysis, etc.

Active Publication Date: 2017-01-11
SOUTHEAST UNIV
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  • Description
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  • Application Information

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Problems solved by technology

However, this method has problems such as high requirements on the equivalence mechanism, complex signal extraction and analysis, etc.

Method used

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  • Rotating machinery shaft torsion vibration fault monitoring method under variable frequency speed regulation driving
  • Rotating machinery shaft torsion vibration fault monitoring method under variable frequency speed regulation driving
  • Rotating machinery shaft torsion vibration fault monitoring method under variable frequency speed regulation driving

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Experimental program
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Effect test

Embodiment Construction

[0059] like figure 1 As shown, a method for monitoring torsional vibration faults of rotating machinery shafting driven by variable frequency speed regulation includes the following steps:

[0060] (1) Collect the three-phase stator current signal of the asynchronous motor i a i b i c ;

[0061] (2) Perform Park transformation and Clarke transformation on the three-phase stator current to obtain the d-axis and q-axis stator current i in the d-q coordinate system d i q ;

[0062] like figure 2 , 3 As shown in and 4, the Park transformation transforms the electromagnetic quantities such as current, voltage, and flux linkage in the three-phase a-b-c coordinate system into the stationary two-phase d-q coordinate system, ds and qs are the coordinate axes of the stationary d-q coordinate system, and the electromagnetic quantity transformation is as follows Formula (1) shows:

[0063] i d ...

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Abstract

The invention discloses a rotating machinery shaft torsion vibration fault monitoring method under variable frequency speed regulation driving. The method comprises the following steps: collecting three-phase stator current signals ia, ib, ic of an asynchronous motor; carrying out Park transformation and Clarke transformation on the three-phase stator current to obtain d-axis and q-axis stator currents id, iq under a d-q coordinate system; carrying out fast Fourier transform on the q-axis stator current component iq to obtain frequency spectrum thereof; setting shaft key parameters and calculating shaft torsion vibration inherent frequency; calculating the ratio of a component, of which the frequency is near the shaft torsion vibration inherent frequency and the absolute value is maximum and a component, of which the frequency is near 0 Hz and the absolute value is maximum in the q-axis stator current component iq; and judging the ratio, and if the ratio surpasses a certain threshold value, judging that torsion vibration fault occurs. The beneficial effects are that, at the electrical side, analysis is carried out on the three-phase stator current; monitoring index is simple, and convenient operation is achieved; and the method does not need the help of existing or extra mechanical equipment, does not influence normal operation of a rotation shaft, and is suitable for long-term monitoring.

Description

technical field [0001] The invention relates to the field of fault diagnosis methods for rotating machinery, in particular to a method for monitoring torsional vibration faults of rotating machinery shafting driven by frequency conversion and speed regulation. Background technique [0002] Rotating machinery plays an irreplaceable and important role in the fields of electric power, energy, chemical industry, and national defense. Among them, rotating machines such as pumps and fans are mostly driven by asynchronous motors. In recent years, from the perspective of speed regulation and energy saving, frequency converter drive motor has become an increasingly widely used motor drive method. [0003] Using a frequency converter to drive the motor can effectively reduce the throttling loss by adjusting the motor speed to adapt to the load change and bring considerable economic benefits. However, since the asynchronous motor is driven by alternating current with rich harmonics, ...

Claims

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Application Information

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IPC IPC(8): G01H11/06G01M13/00
CPCG01H11/06G01M13/00
Inventor 江哲帆杨建刚
Owner SOUTHEAST UNIV
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