Imbalanced signal extracting method of dual-rotor system with slight speed difference

A technology for balancing signals and extraction methods, which is applied in static/dynamic balance testing, machine/structural component testing, measuring devices, etc., and can solve problems such as difficult extraction of unbalanced signals

Active Publication Date: 2013-02-27
SHANGHAI NORMAL UNIVERSITY
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  • Abstract
  • Description
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Problems solved by technology

[0005] The present invention proposes a method for extracting unbalanced signals of a dual-rotor system with a slight speed difference to solve the problem in the prior art that it is difficult to extract unbalanced signals of this system

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  • Imbalanced signal extracting method of dual-rotor system with slight speed difference
  • Imbalanced signal extracting method of dual-rotor system with slight speed difference
  • Imbalanced signal extracting method of dual-rotor system with slight speed difference

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Embodiment Construction

[0054] The present invention is an unbalanced signal extraction method for a dual-rotor system with a slight speed difference, including the following contents:

[0055] The digital bandpass tracking filter link, the pulse transfer function of the filter is

[0056] H ( z ) = k 1 - z - 2 1 + a 1 z - 1 + a 2 z - 2

[0057] The coefficients in the formula are as follows:

[0058] k = ...

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Abstract

The invention provides an imbalanced signal extracting method of a dual-rotor system with slight speed difference, and aims to solve the problem of difficultly in extracting imbalanced signals of the system in the prior art. With regard to un-damped real-value sinusoid signals, an improved Prony method (IPM for short) can be adopted to rather precisely estimate the frequency of each sinusoid signal. For the characteristics of beat vibration signals in the dual-rotor system with slight speed difference4, a band-pass tracking filtering method is adopted to reduce noise and then samples are extracted from filtered data, the IPM is adopted to realize frequency identification of two adjacent frequency signals; and then a least square method is used for identifying the amplitude and the phase of the beat vibration signals.

Description

technical field [0001] The invention belongs to the technical field of mechanical measurement, in particular to a method for extracting unbalanced signals of a double-rotor system with a slight speed difference. Background technique [0002] The micro-speed difference dual-rotor system is widely used in petroleum, chemical, pharmaceutical and other industries. In the vibration signal of this type of system, two power frequency signals with similar frequencies are synthesized into beat vibration signals, which brings great difficulties to the extraction of unbalanced signals. [0003] At present, there are two types of unbalanced signal extraction methods for this type of rotor system. One is the non-beating method, which analyzes the beat peak and beat valley from the time domain waveform, and then obtains two rotors through simple calculations based on the beat vibration principle. The amplitude and phase of the vibration, this method requires at least one measurement time ...

Claims

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Application Information

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IPC IPC(8): G01M1/16
Inventor 李传江张自强李莉陈海雄费敏锐周鸣殷业
Owner SHANGHAI NORMAL UNIVERSITY
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