CN114520658A - Filtering system and method for acquiring frequency multiplication amplitude and phase of vibration signal - Google Patents

Filtering system and method for acquiring frequency multiplication amplitude and phase of vibration signal Download PDF

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Publication number
CN114520658A
CN114520658A CN202210226801.4A CN202210226801A CN114520658A CN 114520658 A CN114520658 A CN 114520658A CN 202210226801 A CN202210226801 A CN 202210226801A CN 114520658 A CN114520658 A CN 114520658A
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signal
vibration signal
phase
preset
frequency
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杨振国
吴恩奇
段汝良
王焊鹏
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Zhejiang Supcon Technology Co Ltd
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Zhejiang Supcon Technology Co Ltd
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/14—Fourier, Walsh or analogous domain transformations, e.g. Laplace, Hilbert, Karhunen-Loeve, transforms
    • G06F17/141—Discrete Fourier transforms
    • G06F17/142—Fast Fourier transforms, e.g. using a Cooley-Tukey type algorithm
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H17/00—Networks using digital techniques
    • H03H17/02—Frequency selective networks

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Abstract

The invention relates to a filtering system and a method for acquiring frequency multiplication amplitude and phase of a vibration signal, wherein the filtering system comprises: the sensor is arranged on the rotating equipment and used for acquiring a vibration signal of the rotating equipment; the hardware conditioning circuit is used for converting the vibration signal into a first signal which can be input to an analog-to-digital converter; the analog-to-digital converter is used for sampling the first signal to obtain a first sampling signal; and the digital signal processor is used for filtering the first sampling signal by adopting a preset filter to obtain the filtered first sampling signal. According to the filtering system, the preset filter is adopted to filter the first sampling signal to obtain the filtered first sampling signal, and compared with the prior art, the filtering system can filter corresponding interference signals.

Description

Filtering system and method for acquiring frequency multiplication amplitude and phase of vibration signal
Technical Field
The invention relates to the technical field of industrial rotating machinery equipment monitoring, in particular to a filtering system and a method for acquiring frequency doubling amplitude and phase of a vibration signal.
Background
The running state of the rotating mechanical equipment in the industrial field is mainly monitored, analyzed and alarmed by a vibration monitoring system. The monitoring content of the vibration monitoring system comprises vibration, displacement, rotating speed, key phase, temperature and the like, and is used for analyzing and predicting the running state and the health state of the equipment. The vibration monitoring function mainly performs time domain and frequency domain analysis on the vibration signal. However, in the prior art, the vibration signal is not filtered, so that the obtained vibration signal is not accurate. Meanwhile, in an actual monitoring environment, a certain frequency doubling can generate false alarm due to frequency deviation, and the vibration signal does not have a large component at the frequency doubling but is calculated in a fast Fourier transform mode.
Disclosure of Invention
Technical problem to be solved
In view of the above disadvantages and shortcomings of the prior art, the present invention provides a filtering system and a method for obtaining a frequency multiplication amplitude and a phase of a vibration signal, which solves the technical problems of inaccuracy of the vibration signal in the prior art.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
in a first aspect, an embodiment of the present invention provides a filtering system, including:
The sensor is arranged on the rotating equipment and used for acquiring a vibration signal of the rotating equipment;
the hardware conditioning circuit is used for converting the vibration signal into a first signal which can be input to an analog-to-digital converter;
the analog-to-digital converter is used for sampling the first signal to obtain a first sampling signal;
and the digital signal processor is used for filtering the first sampling signal by adopting a preset filter to obtain the filtered first sampling signal.
In a preferred embodiment of the method of the invention,
the preset filter is as follows: a low pass filter with a cut-off frequency of MHz;
wherein M is a preset value.
Preferably, the first and second liquid crystal materials are,
the preset filter is as follows: a bandpass filter with a cut-off frequency of NHz;
wherein N is a preset value.
Preferably, the first and second liquid crystal materials are,
the preset filter is as follows: an elliptic filter or a butterworth filter.
Preferably, the system further comprises:
the key phase monitoring module is used for acquiring the rotation frequency of the rotating equipment and generating a rectangular wave signal which is the same as the rotation frequency of the equipment;
and the vibration monitoring frequency domain analysis module is used for acquiring the preset frequency doubling amplitude and phase of the vibration signal in a fast Fourier transform mode according to the vibration signal and the rectangular wave signal.
In a preferred embodiment of the method of the invention,
the preset filter is as follows: a band-pass filter having a cutoff frequency that is the rotation frequency of the rotating device.
In a preferred embodiment of the method of the invention,
the step of obtaining the preset frequency multiplication amplitude and the preset phase of the vibration signal by adopting a fast fourier transform mode according to the vibration signal and the rectangular wave signal specifically comprises the following steps of:
acquiring the number n of times of a signal zero point of the vibration signal in a preset first time period;
the first time period is m cycles of the rectangular wave signal;
and acquiring the preset frequency doubling amplitude and phase of the vibration signal by adopting a fast Fourier transform mode based on the n and the m.
Preferably, the first and second liquid crystal materials are,
the preset frequency multiplication amplitude and the preset phase of the vibration signal are as follows:
1 frequency multiplication amplitude and phase of the vibration signal; or 1/2 frequency doubling amplitude and phase of the vibration signal; or 2 times the amplitude and phase of the vibration signal.
Preferably, the obtaining the preset frequency multiplication amplitude and phase of the vibration signal in a fast fourier transform manner based on the n and the m specifically includes:
when 2m-1 is less than or equal to n is less than or equal to 2m +1, acquiring 1 frequency multiplication amplitude and phase of the vibration signal by adopting a fast Fourier transform mode;
When m-1 is less than or equal to n is less than or equal to m +1, obtaining 1/2 frequency multiplication amplitude and phase of the vibration signal by adopting a fast Fourier transform mode;
and when the value of 4m-1 is less than or equal to n is less than or equal to 4m +1, acquiring the amplitude and the phase of the frequency multiplication 2 of the vibration signal by adopting a fast Fourier transform mode.
In a second aspect, an embodiment of the present invention provides a method for obtaining a multiplied frequency amplitude and a phase of a vibration signal, where the method is performed by the system in the foregoing.
(III) advantageous effects
The beneficial effects of the invention are: compared with the prior art, the filtering system can filter the corresponding interference signal by adopting the preset filter to filter the first sampling signal and obtain the filtered first sampling signal. The key phase monitoring module is adopted to acquire the rotation frequency of the rotating equipment and generate a rectangular wave signal which is the same as the rotation frequency of the equipment; and a vibration monitoring frequency domain analysis module is adopted, and a preset frequency doubling amplitude and phase of the vibration signal are obtained in a fast Fourier transform mode according to the vibration signal and the rectangular wave signal, so that interference can be filtered to the maximum extent and false alarm can be avoided.
Drawings
FIG. 1 is a schematic diagram of a filtering system according to the present invention;
FIG. 2 is a schematic diagram of a filtering system according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a vibration signal and a rectangular wave signal under an ideal condition;
fig. 4 is a schematic diagram of a vibration signal and a rectangular wave signal in an actual situation.
[ instruction of reference ]
1: a vibration signal;
2: a rectangular wave signal;
3: a signal zero point.
Detailed Description
For a better understanding of the present invention, reference will now be made in detail to the present embodiments of the invention, which are illustrated in the accompanying drawings.
In order to better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Referring to fig. 1, the present embodiment provides a filtering system, including:
and the sensor is arranged on the rotating equipment and is used for acquiring a vibration signal of the rotating equipment.
The vibration signal in this embodiment is a signal into which the sensor converts the vibration of the rotating device.
And the hardware conditioning circuit is used for converting the vibration signal into a first signal which can be input to the analog-to-digital converter.
And the analog-to-digital converter is used for sampling the first signal to obtain a first sampling signal.
And the digital signal processor is used for filtering the first sampling signal by adopting a preset filter to obtain the filtered first sampling signal.
In the prior art, the frequency of a signal which is supported and collected by vibration monitoring is in the approximate range of 1 Hz-30 kHz, the filtering parameters of hardware are usually selected to be large and fixed and can not be changed, in order to solve the limitation of hardware filtering and improve the anti-interference performance of a vibration signal, a preset filter is adopted for filtering before a digital signal processor calculates.
In an implementation manner of this embodiment, the preset filter is: a low pass filter with a cut-off frequency of MHz; wherein M is a preset value. Specifically, M in this example is 1.
In an implementation manner of this embodiment, the preset filter is: a bandpass filter with a cut-off frequency of NHz; wherein N is a preset value.
In an implementation manner of this embodiment, the preset filter is: an elliptic filter or a butterworth filter.
Referring to fig. 2, in a specific application of the embodiment, the system further includes: and the key phase monitoring module is used for acquiring the rotation frequency of the rotating equipment and generating a rectangular wave signal which is the same as the rotation frequency of the equipment.
And the vibration monitoring frequency domain analysis module is used for acquiring the preset frequency doubling amplitude and phase of the vibration signal by adopting a fast Fourier transform mode according to the vibration signal and the rectangular wave signal.
In an implementation manner of this embodiment, the preset filter is: a band-pass filter having a cutoff frequency that is the rotational frequency of the rotating device.
Referring to fig. 3, in an ideal situation, the frequencies of the vibration signal 1 and the rectangular wave signal 3 are the same, and at this time, the frequency 1 multiplied by amplitude and the corresponding phase of the vibration signal, the frequency 1/2 multiplied by amplitude and the corresponding phase, and the frequency 2 multiplied by amplitude and the corresponding phase can be accurately calculated by using a fast fourier transform. However, in an actual monitoring environment, a certain frequency difference may exist between the vibration signal 1 and the rectangular wave signal 2, and at this time, the result calculated according to the fast fourier transform method does not only have a frequency multiplication amplitude of 1, but also has components of 1/2 frequency multiplication, 2 frequency multiplication and other frequency multiplication. Therefore, in the case of frequency deviation between the two, a false alarm may be generated due to a certain frequency multiplication, which is not a large component of the vibration signal, but is calculated by means of fast fourier transform.
Referring to fig. 4, in order to avoid errors, in a specific application of this embodiment, the obtaining, according to the vibration signal 1 and the rectangular wave signal 2, the preset frequency multiplication amplitude and phase of the vibration signal 1 by using a fast fourier transform method specifically includes:
acquiring the number n of times of a signal zero point 3 passed by the vibration signal 1 in a preset first time period; in this embodiment, the signal zero point is zero of the vibration signal.
The first time period is m cycles of the rectangular wave signal 2; referring to fig. 4, m in the present embodiment is 3, that is, the first period is 3 cycles of the rectangular wave signal.
And acquiring the preset frequency doubling amplitude and phase of the vibration signal by adopting a fast Fourier transform mode based on the n and the m.
In a specific application of this embodiment, the preset frequency multiplication amplitude and phase of the vibration signal are:
1 multiplied frequency amplitude and phase of the vibration signal; or 1/2 frequency doubling amplitude and phase of the vibration signal; or 2 times the amplitude and phase of the vibration signal.
In a specific application of this embodiment, the obtaining, based on the n and the m, a preset frequency multiplication amplitude and a preset phase of the vibration signal in a fast fourier transform manner specifically includes:
And when the value of 2m-1 is less than or equal to n is less than or equal to 2m +1, acquiring the frequency multiplication amplitude and the phase of the vibration signal by adopting a fast Fourier transform mode.
And when m-1 is less than or equal to n is less than or equal to m +1, obtaining 1/2 frequency multiplication amplitude and phase of the vibration signal by adopting a fast Fourier transform mode.
And when the value of 4m-1 is less than or equal to n is less than or equal to 4m +1, acquiring the amplitude and the phase of the frequency multiplication 2 of the vibration signal by adopting a fast Fourier transform mode.
Compared with the prior art, the filtering system can filter the corresponding interference signal by adopting the preset filter to filter the first sampling signal and obtain the filtered first sampling signal. The key phase monitoring module is adopted to acquire the rotation frequency of the rotating equipment and generate a rectangular wave signal with the same rotation frequency as the equipment; and a vibration monitoring frequency domain analysis module is adopted, and a preset frequency doubling amplitude value and a preset frequency doubling phase position of the vibration signal are obtained in a fast Fourier transform mode according to the vibration signal and the rectangular wave signal, so that interference can be filtered to the maximum degree, and false alarm can be avoided.
Since the system described in the above embodiment of the present invention is a system used for implementing the method in the above embodiment of the present invention, a person skilled in the art can understand the specific structure and the modification of the system based on the method described in the above embodiment of the present invention, and thus the detailed description is omitted here. All systems adopted by the method of the above embodiment of the present invention are within the protection scope of the present invention.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions.
It should be noted that in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the terms first, second, third and the like are for convenience only and do not denote any order. These words are to be understood as part of the name of the component.
Furthermore, it should be noted that in the description of the present specification, the description of the term "one embodiment", "some embodiments", "examples", "specific examples" or "some examples", etc., means that a specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, the claims should be construed to include preferred embodiments and all changes and modifications that fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention should also include such modifications and variations.

Claims (10)

1. A filtering system, comprising:
the sensor is arranged on the rotating equipment and used for acquiring a vibration signal of the rotating equipment;
the hardware conditioning circuit is used for converting the vibration signal into a first signal which can be input to an analog-to-digital converter;
the analog-to-digital converter is used for sampling the first signal to obtain a first sampling signal;
and the digital signal processor is used for filtering the first sampling signal by adopting a preset filter to obtain the filtered first sampling signal.
2. The adaptive filtering system according to claim 1,
the preset filter is as follows: a low pass filter with a cut-off frequency of MHz;
wherein M is a preset value.
3. The adaptive filtering system according to claim 1,
the preset filter is as follows: a bandpass filter with a cut-off frequency of NHz;
Wherein N is a preset value.
4. The adaptive filtering system of claim 1,
the preset filter is as follows: an elliptic filter or a butterworth filter.
5. The adaptive filtering system according to claim 1, wherein the system further comprises:
the key phase monitoring module is used for acquiring the rotation frequency of the rotating equipment and generating a rectangular wave signal which is the same as the rotation frequency of the equipment;
and the vibration monitoring frequency domain analysis module is used for acquiring the preset frequency doubling amplitude and phase of the vibration signal in a fast Fourier transform mode according to the vibration signal and the rectangular wave signal.
6. The adaptive filtering system according to claim 5,
the preset filter is as follows: a band-pass filter having a cutoff frequency that is the rotational frequency of the rotating device.
7. The system of claim 6,
the step of obtaining the preset frequency multiplication amplitude and the preset phase of the vibration signal by adopting a fast fourier transform mode according to the vibration signal and the rectangular wave signal specifically comprises the following steps of:
acquiring the number n of times of a signal zero point of the vibration signal in a preset first time period;
The first time period is m periods of the rectangular wave signal;
and acquiring a preset frequency multiplication amplitude value and a preset frequency multiplication phase of the vibration signal by adopting a fast Fourier transform mode based on the n and the m.
8. The system of claim 7,
the preset frequency multiplication amplitude and the preset phase of the vibration signal are as follows:
1 frequency multiplication amplitude and phase of the vibration signal; or 1/2 frequency doubling amplitude and phase of the vibration signal; or 2 times the amplitude and phase of the vibration signal.
9. The system according to claim 8, wherein the obtaining the preset multiplied frequency amplitude and phase of the vibration signal by using fast fourier transform based on n and m specifically comprises:
when 2m-1 is less than or equal to n is less than or equal to 2m +1, acquiring 1 frequency multiplication amplitude and phase of the vibration signal by adopting a fast Fourier transform mode;
when m-1 is less than or equal to n is less than or equal to m +1, 1/2 frequency multiplication amplitude and phase of the vibration signal are obtained in a fast Fourier transform mode;
and when the value of 4m-1 is less than or equal to n is less than or equal to 4m +1, acquiring the 2-frequency multiplication amplitude and the phase of the vibration signal by adopting a fast Fourier transform mode.
10. A method for obtaining a multiplied amplitude and phase of a vibration signal, wherein the method is performed by the system of any one of claims 6-9.
CN202210226801.4A 2022-03-09 2022-03-09 Filtering system and method for acquiring frequency multiplication amplitude and phase of vibration signal Pending CN114520658A (en)

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CN202210226801.4A CN114520658A (en) 2022-03-09 2022-03-09 Filtering system and method for acquiring frequency multiplication amplitude and phase of vibration signal

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