CN108151873A - A kind of method for detaching centrifugal pump vibration signal and Heat Exchanger in Circulating Water System vibration signal - Google Patents
A kind of method for detaching centrifugal pump vibration signal and Heat Exchanger in Circulating Water System vibration signal Download PDFInfo
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- CN108151873A CN108151873A CN201711428894.4A CN201711428894A CN108151873A CN 108151873 A CN108151873 A CN 108151873A CN 201711428894 A CN201711428894 A CN 201711428894A CN 108151873 A CN108151873 A CN 108151873A
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Abstract
The invention discloses a kind of methods for detaching centrifugal pump vibration signal and Heat Exchanger in Circulating Water System vibration signal, include the following steps：Step 1, wireless sensor acquisition mixed signal are transported to computer by radio network gateway, and computer imports vibration signal data on MATLAB platforms with a matrix type；Step 2 decomposes by EMD algorithms, obtains one group of stable state and the intrinsic mode functions of linear data sequence collection, i.e. unlike signal internal characteristics vibration mode；Step 3, these intrinsic mode functions pass through the height of particular Gaussian window, the generalized S-transform of width, the intrinsic mode functions for meeting frequency requirement are retained, finally obtain the data for containing only Heat Exchanger in Circulating Water System vibration performance by the intrinsic mode functions zero setting that will not meet frequency requirement on time-frequency domain；Such method can improve the precision of Heat Exchanger in Circulating Water System plugging fault diagnosis.
Description
Technical field
The present invention relates to vibration signals to detach field, specifically a kind of that centrifugal pump vibration signal shakes with Heat Exchanger in Circulating Water System
The method of dynamic Signal separator.
Background technology
In recent years, Signal separator at home and abroad all achieved great development and breakthrough.Pass through vibration signal diagnostic instrumentation
The application of failure etc. gradually increases, but many equipment and environment can also generate vibration and noise in practice.These interference
Vibration signal transmitted by equipment, air, the failure source signal for needing collecting device with us mixes, severe jamming
Fault diagnosis based on vibration signal.
Now in the fault diagnosis of the Heat Exchanger in Circulating Water System based on vibration signal, because centrifugal pump provides flow dynamic, work
Larger noise and vibration can be generated, the acquisition that heat exchanging device vibration signal is transmitted by pipeline connection and air causes seriously
Interference.In the heat-exchanger model of laboratory, centrifugal pump vibration is one of vibration signal source of heat exchanger system, and centrifugal pump
Vibration frequency can change with the flow stream and blocked state of heat exchanger tube.The ambient noise in laboratory essentially from
The noise of pump work is centrifuged, other noises are relatively small, influence very little to wireless sensor, therefore the influence of ambient noise can be neglected
Disregard.The noise and vibration that centrifugal pump is transmitted by air can be isolated with heat exchanger vibration signal by simple method, and lead to
The vibration signal that piping connection is transmitted can not but remove easily.
The vibration signal that centrifugation pump work generates is transmitted through piping, and one is blended in the vibration signal of heat exchanger tube
It rises, the wireless sensor acquisition for being finally disposed in different location is transferred to gateway terminal, and generation includes centrifugal pump vibration frequency
Fault diagnosis data inside.In the method for diagnosing faults of the Heat Exchanger in Circulating Water System based on vibration signal, become with Fourier
Vibration signal of changing commanders is transformed into time-frequency domain and is analyzed, this brings the difficulty of bigger to the separation of centrifugal pump vibration signal, to following
The fault diagnosis of ring water- to-water heat exchanger brings great puzzlement.Therefore, a kind of new separation centrifugal pump vibration signal is found with following
The method of ring water- to-water heat exchanger vibration signal is very necessary, and the present invention solves this problem.
Invention content
To solve the deficiencies in the prior art, the purpose of the present invention is to provide a kind of separation centrifugal pump vibration signal and cycles
The method of water- to-water heat exchanger vibration signal improves the accuracy of Heat Exchanger in Circulating Water System fault diagnosis.
In order to realize above-mentioned target, the present invention adopts the following technical scheme that：
A kind of method for detaching centrifugal pump vibration signal and Heat Exchanger in Circulating Water System vibration signal, including：
Step 1 acquires mixed signal by wireless vibration sensor, mixed signal is transported to meter by radio network gateway
In calculation machine, vibration signal data is imported MATLAB platforms by computer with a matrix type；
Step 2 decomposes by EMD algorithms, obtains one group of stable state and linear data sequence collection, i.e., in unlike signal
The intrinsic mode functions of eigen vibration form；
Step 3, by the intrinsic mode functions that step 2 obtains by the height of particular Gaussian window, the generalized S-transform of width,
The intrinsic mode functions zero setting that will not meet frequency requirement on time-frequency domain retains the intrinsic mode functions for meeting frequency requirement, most
Obtain containing only the data of Heat Exchanger in Circulating Water System vibration performance eventually.
A kind of aforementioned separation centrifugal pump vibration signal and the method for Heat Exchanger in Circulating Water System vibration signal, wireless vibration sensing
Device uses the A104 type wireless vibration sensors of Beijing Beetech Technology Inc..
A kind of aforementioned separation centrifugal pump vibration signal and the method for Heat Exchanger in Circulating Water System vibration signal, wireless vibration sensing
Device is adsorbed in the rack of the outer surface of heat exchanger and centrifugal pump.
A kind of aforementioned separation centrifugal pump vibration signal and the method for Heat Exchanger in Circulating Water System vibration signal, above-mentioned mixed signal
Including：Heat exchanger tube vibration signal, centrifugal pump vibration signal.
A kind of aforementioned separation centrifugal pump vibration signal and the method for Heat Exchanger in Circulating Water System vibration signal, vibration signal data
It is decomposed by EMD algorithms, the detailed process for obtaining intrinsic mode functions is：
If sensor acquisition mixing vibration signal is X (t)={ x1(t), xm(t) } it, is decomposed into through EMD：
···
C represents intrinsic mode functions component in formula, contains in heat exchanger source signal in the eigenfunction s of vibration performanceimf,
And in the intrinsic mode functions b of vibration performance in centrifugal pump vibration signalimf；R represents discrepance.
The matrix of signal is defined as after EMD is decomposed
Rimf=E [ximf(t)ximf H(t)]；
If centrifugal pump vibration intrinsic mode functions bimfWith heat exchanger source signal intrinsic mode functions simfUncorrelated, matrix becomes
Rimf=E [simf(t)simf H(t)]+E[bimf(t)bimf H(t)]；
If centrifugal pump vibration is spatial white signal, matrix becomes
Rimf=E [simf(t)simf H(t)]+σ2IM-N；
M=l in formula1+l2+ 2, IM-NIt is unit matrix, σ2It is the frequency of centrifugal pump vibration；Wherein bimfAnd σ2IM-NPart is
The intrinsic mode functions of centrifugal pump vibration frequency that should be removed.
A kind of aforementioned separation centrifugal pump vibration signal and the method for Heat Exchanger in Circulating Water System vibration signal, which is characterized in that
Intrinsic mode functions progress generalized S-transform is filtered out the detailed process of centrifugal pump vibration signal is：
If the model of S-transformation Time-frequency Filter is：
C (τ, f) is Time-frequency Filter in formula, corresponds to model and is：
S in formulamaxFor time-frequency matrix amplitude maximum after generalized S-transform, λ is threshold factor, 0≤λ≤1.
For signal after S-transformation, s-matrix is S (t, f), and mixed filtering model is：
In formula：
The invention has the beneficial effects that：The present invention provides a kind of separation centrifugal pump vibration signal and Heat Exchanger in Circulating Water System shakes
The method of dynamic signal, by combining EMD algorithms and Gauss Neighborhood Filtering method, obtains containing only Heat Exchanger in Circulating Water System vibration performance
Data, so as to improve Heat Exchanger in Circulating Water System plugging fault diagnosis precision.
Description of the drawings
Fig. 1 is a kind of flow chart of embodiment of the present invention.
Specific embodiment
Make specific introduce to the present invention below in conjunction with the drawings and specific embodiments.
A kind of method for detaching centrifugal pump vibration signal and Heat Exchanger in Circulating Water System vibration signal, including：
Step 1 acquires mixed signal by wireless vibration sensor, mixed signal is transported to meter by radio network gateway
In calculation machine, vibration signal data is imported MATLAB platforms by computer with a matrix type；
Step 2 decomposes by EMD algorithms, obtains one group of stable state and linear data sequence collection, i.e., in unlike signal
The intrinsic mode functions of eigen vibration form；
Vibration signal data is decomposed by EMD algorithms, and the detailed process for obtaining intrinsic mode functions is：
If sensor acquisition mixing vibration signal is X (t)={ x1(t), xm(t) } it, is decomposed into through EMD：
···
C represents intrinsic mode functions component in formula, contains in heat exchanger source signal in the eigenfunction s of vibration performanceimf,
And in the intrinsic mode functions b of vibration performance in centrifugal pump vibration signalimf；R represents discrepance.
The matrix of signal is defined as after EMD is decomposed
Rimf=E [ximf(t)ximf H(t)]；
If centrifugal pump vibration intrinsic mode functions bimfWith heat exchanger source signal intrinsic mode functions simfUncorrelated, matrix becomes
Rimf=E [simf(t)simf H(t)]+E[bimf(t)bimf H(t)]；
If centrifugal pump vibration is spatial white signal, matrix becomes
Rimf=E [simf(t)simf H(t)]+σ2IM-N；
M=l in formula1+l2+ 2, IM-NIt is unit matrix, σ2It is the frequency of centrifugal pump vibration；Wherein bimfAnd σ2IM-NPart is
The intrinsic mode functions of centrifugal pump vibration frequency that should be removed.
Step 3, by the intrinsic mode functions that step 2 obtains by the height of particular Gaussian window, the generalized S-transform of width,
By the intrinsic mode functions zero setting for not meeting frequency requirement, (such step can remove the dry of centrifugation pump frequency on time-frequency domain
Disturb), the intrinsic mode functions for meeting frequency requirement are retained, finally obtain the data for containing only Heat Exchanger in Circulating Water System vibration performance；
Intrinsic mode functions progress generalized S-transform is filtered out the detailed process of centrifugal pump vibration signal is：
If the model of S-transformation Time-frequency Filter is：
C (τ, f) is Time-frequency Filter in formula, corresponds to model and is：
S in formulamaxFor time-frequency matrix amplitude maximum after generalized S-transform, λ is threshold factor, 0≤λ≤1.
For signal after S-transformation, s-matrix is S (t, f), and mixed filtering model is：
In formula：
Mixed signal includes：Heat exchanger tube vibration signal, centrifugal pump vibration signal.Wireless vibration sensor uses Beijing
The A104 type wireless vibration sensors of Science and Technology Ltd. must be created.The absorption of wireless vibration sensor is detected in the outer surface of heat exchanger
Heat exchanger tube vibration signal；The absorption of wireless vibration sensor detects centrifugal pump vibration signal in the rack of centrifugal pump.Wirelessly
Sensor is placed on the heat collecting exchanger pipe vibration signal that heat exchanger appearance can be more efficient, is placed on centrifugal pump rack and heat exchange
Device outer surface forms the control of vibration signal.
According to centrifugal pump vibration frequency and the difference of heat exchanger source signal vibration frequency, it can suitably change the height of Gauss window
Degree and width, so as to obtain the frequency resolution met the requirements.
Because the frequency that centrifugal pump vibration generates is specific, therefore on the basis of decomposing to obtain different intrinsic mode functions through EMD,
The Time-frequency Filter model of the mixed type can carry out the removal of centrifugal pump vibration signal, so as to the eigen mode letter of heat exchanger source signal
Number remains, other interference vibration signal then zero setting finally obtain the data for containing only Heat Exchanger in Circulating Water System vibration performance.
The present invention provides a kind of method for detaching centrifugal pump vibration signal and Heat Exchanger in Circulating Water System vibration signal, passes through combination
EMD algorithms and Gauss Neighborhood Filtering method obtain containing only the data of Heat Exchanger in Circulating Water System vibration performance, so as to improve recirculated water
The precision of heat exchanger plugging fault diagnosis.
The basic principles, main features and advantages of the invention have been shown and described above.The technical staff of the industry should
Understand, the invention is not limited in any way above-described embodiment, all to be obtained by the way of equivalent substitution or equivalent transformation
Technical solution is all fallen in protection scope of the present invention.
Claims (6)
- A kind of 1. method for detaching centrifugal pump vibration signal and Heat Exchanger in Circulating Water System vibration signal, which is characterized in that including：Step 1 acquires mixed signal by wireless vibration sensor, mixed signal is transported to computer by radio network gateway In, vibration signal data is imported MATLAB platforms by computer with a matrix type；Step 2 decomposes by EMD algorithms, obtains one group of stable state and linear data sequence collection, i.e. unlike signal internal characteristics The intrinsic mode functions of vibration mode；Step 3, by the intrinsic mode functions that step 2 obtains by the height of particular Gaussian window, the generalized S-transform of width, when The intrinsic mode functions zero setting that will not meet frequency requirement on frequency domain retains the intrinsic mode functions for meeting frequency requirement, final To the data for containing only Heat Exchanger in Circulating Water System vibration performance.
- 2. a kind of method for detaching centrifugal pump vibration signal and Heat Exchanger in Circulating Water System vibration signal according to claim 1, It is characterized in that, wireless vibration sensor uses the A104 type wireless vibration sensors of Beijing Beetech Technology Inc..
- 3. a kind of method for detaching centrifugal pump vibration signal and Heat Exchanger in Circulating Water System vibration signal according to claim 1, It is characterized in that, the absorption of wireless vibration sensor is in the rack of the outer surface of heat exchanger and centrifugal pump.
- 4. a kind of method for detaching centrifugal pump vibration signal and Heat Exchanger in Circulating Water System vibration signal according to claim 3, It is characterized in that, above-mentioned mixed signal includes：Heat exchanger tube vibration signal, centrifugal pump vibration signal.
- 5. a kind of method for detaching centrifugal pump vibration signal and Heat Exchanger in Circulating Water System vibration signal according to claim 1, It is characterized in that, vibration signal data is decomposed by EMD algorithms, the detailed process for obtaining intrinsic mode functions is：If sensor acquisition mixing vibration signal is X (t)={ x1(t), xm(t) } it, is decomposed into through EMD：C represents intrinsic mode functions component in formula, contains in heat exchanger source signal in the eigenfunction s of vibration performanceimfAnd In the intrinsic mode functions b of vibration performance in centrifugal pump vibration signalimf；R represents discrepance.The matrix of signal is defined as after EMD is decomposedRimf=E [ximf(t)ximf H(t)]；If centrifugal pump vibration intrinsic mode functions bimfWith heat exchanger source signal intrinsic mode functions simfUncorrelated, matrix becomesRimf=E [simf(t)simf H(t)]+E[bimf(t)bimf H(t)]；If centrifugal pump vibration is spatial white signal, matrix becomesRimf=E [simf(t)simf H(t)]+σ2IM-N；M=l in formula1+l2+ 2, IM-NIt is unit matrix, σ2It is the frequency of centrifugal pump vibration；Wherein bimfAnd σ2IM-NPart is should to go The intrinsic mode functions of centrifugal pump vibration frequency removed.
- 6. a kind of method for detaching centrifugal pump vibration signal and Heat Exchanger in Circulating Water System vibration signal according to claim 1, It is characterized in that, the detailed process that intrinsic mode functions progress generalized S-transform is filtered out to centrifugal pump vibration signal is：If the model of S-transformation Time-frequency Filter is：C (τ, f) is Time-frequency Filter in formula, corresponds to model and is：S in formulamaxFor time-frequency matrix amplitude maximum after generalized S-transform, λ is threshold factor, 0≤λ≤1.Signal passes through S-transformation Afterwards, s-matrix is S (t, f), and mixed filtering model is：In formula：
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