CN106409351A - Method and device for processing vibration signal of loose part of nuclear power plant - Google Patents
Method and device for processing vibration signal of loose part of nuclear power plant Download PDFInfo
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- CN106409351A CN106409351A CN201610822602.4A CN201610822602A CN106409351A CN 106409351 A CN106409351 A CN 106409351A CN 201610822602 A CN201610822602 A CN 201610822602A CN 106409351 A CN106409351 A CN 106409351A
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C13/00—Pressure vessels; Containment vessels; Containment in general
- G21C13/02—Details
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention discloses a method and a device for processing a vibration signal of a loose part of a nuclear power plant, and belongs to the technical field of nuclear engineering. The method comprises the steps: acquiring an actual noised vibration signal of the loose part of the nuclear power plant; performing self-correlation operation on the noised vibration signal, decomposing to obtain a self-correlation function of the vibration signal, a self-correlation function of noise and a mutual-correlation function of the vibration signal and the noise so as to realize primary de-noising treatment on the noised vibration signal and obtain the noised vibration signal subjected to de-noising treatment; and performing wavelet de-noising treatment on the noised vibration signal subjected to de-noising treatment and performing wavelet inverse treatment on the noised vibration signal subjected to wavelet de-noising treatment so as to reconstruct the signal. According to the method and the device, various noise and interference superposed on the tested signals are eliminated as much as possible under the strong noise interference condition, and the reliability and the stability of the acquired vibration signal are guaranteed.
Description
Technical field
The invention belongs to nuclear engineering technical field, a kind of processing method of more particularly, to nuclear power plant loose part vibration signal
And device.
Background technology
Include in-pile component and fuel assembly inside nuclear reactor pressure container, in-pile component is mainly by holding down assembly, hang
Basket assembly, reactor core lower support assembly etc. form, and the part in each assembly and most of screw, the pin etc. of passing through of part connect.To the greatest extent
Manage these connectors and take locking, anticreep measure in the design, but under reactor for a long time continuous service condition, because of current punching
Hit the impact with Flow vibration, some parts may be made to produce and loosen or even come off, thus forming the portion that gets loose in primary Ioops
Part.Simultaneously when constructing, reloading or keep in repair, also there is the probability leaving metalwork in primary Ioops system.Equipment generation part
Loosen, appliance integrality will be made to be destroyed, affect its normal work.After loose part comes off, will move with runner, shock sets
Standby and wall, makes equipment and wall impaired, leads to reactor to be not normally functioning when serious.Therefore, reactor coolant is entered
The vibration monitoring of row loose part is particularly significant.
Content of the invention
The present invention is directed to the filtering method using low pass or band logical in existing nuclear power plant I＆C system and loose part is supervised
The noisy vibration signal that examining system collects carries out the higher problem of false alarm rate of noise reduction, there is provided a kind of nuclear power plant loosens portion
The processing method and processing device of part vibration signal.
The technical scheme that the present invention proposes with regard to above-mentioned technical problem is as follows：
On the one hand, the present invention provides a kind of processing method of nuclear power plant loose part vibration signal, for detection reaction heap
In coolant system, loose part that may be present, the method comprising the steps of：
S1, the noisy vibration signal of reality of collection nuclear power plant loose part；
S2, according to described noisy vibration signal, it is carried out with auto-correlation computation, and decompose the auto-correlation obtaining vibration signal
The cross-correlation function of function, the auto-correlation function of noise and vibration signal and noise, realizes preliminary to noisy vibration signal
Noise reduction process；
S3, wavelet de-noising process is carried out to the noisy vibration signal after the preliminary noise reduction process of auto-correlation computation, obtain
Noisy vibration signal after wavelet de-noising process, the noisy vibration signal inversion after described wavelet de-noising is processed is processed, with weight
Noisy vibration signal after wavelet de-noising process described in structure.
In the processing method of a kind of nuclear power plant loose part vibration signal that the present invention provides, described step S1 collects
Actual noisy vibration signal is noisy vibration signal x (t) of first via during time t and the second tunnel after time τ noisy vibration letter
Number x (t+ τ).
In the processing method of a kind of nuclear power plant loose part vibration signal that the present invention provides, the noisy vibration of the described first via
Signal x (t) be represented by amplitude be A, frequency be that f, initial phase areNoise signal is the SIN function of n (t).
In the processing method of a kind of nuclear power plant loose part vibration signal that the present invention provides, described step S2 is specifically processed
Process includes：
S21, using auto-correlation function, auto-correlation computation is carried out to described noisy vibration signal；
S22, using analytic function, decomposition operation is carried out to described auto-correlation function；
The auto-correlation function that decomposition obtains described vibration signal is RS(τ), the first of described vibration signal and noise is mutual
Pass function is RSN(τ), the second cross-correlation function R of described vibration signal and noiseNS(τ), the auto-correlation function of described noise is
RN(τ)；
S23, the suitably described τ-value of selection, the first cross-correlation function of the described vibration signal of reduction and noise, described vibration
The functional value of the auto-correlation function of the second cross-correlation function of signal and noise and described noise, obtains described preliminary noise reduction process
Noisy vibration signal afterwards；
In the processing method of a kind of nuclear power plant loose part vibration signal that the present invention provides, described step S3 is specifically processed
Process includes：
S31, wavelet de-noising process is carried out to the noisy vibration signal after described preliminary noise reduction process, by described noise reduction process
Noisy vibration signal afterwards decomposes the wavelet coefficient on different frequency bands, decomposition being obtained and carries out threshold process, will be less than threshold
The wavelet coefficient zero setting of value, realizes reducing further noise signal, obtains the noisy vibration signal after wavelet de-noising is processed；
S32, to described wavelet de-noising process after noisy vibration signal carry out wavelet inverse transformation process, frequency-region signal is inverse
It is changed into time-domain signal, obtain the vibration signal reconstructing.
In the processing method of a kind of nuclear power plant loose part vibration signal that the present invention provides, the scope of described τ-value be [0,
T].
In the processing method of a kind of nuclear power plant loose part vibration signal that the present invention provides, containing after described noise reduction process
Vibration signal of making an uproar is represented by with regard to postponing the binary function with frequency.
On the other hand, the invention provides a kind of processing meanss of nuclear power plant loose part vibration signal, described device bag
Include：
Signal acquisition module, is arranged on nuclear reactor, the noisy vibration letter of the reality for gathering nuclear power plant's loose part
Number；
Computing module, connects described signal acquisition module, for carrying out auto-correlation according to described noisy vibration signal to it
Computing, and decompose auto-correlation function, the auto-correlation function of noise and the vibration signal of acquisition vibration signal and the mutual of noise
Close function, realize the preliminary noise reduction process to noisy vibration signal；
Processing module, connects described calculating decomposing module, for the signal after the preliminary noise reduction process of auto-correlation computation
Carry out wavelet de-noising process, obtain the noisy vibration signal after wavelet de-noising is processed, and noisy after described noise reduction process is shaken
Dynamic signal carries out inversion process, to reconstruct the noisy vibration signal after described noise reduction process.
In the processing meanss of a kind of nuclear power plant loose part vibration signal that the present invention provides, described signal acquisition module bag
Include piezoelectric acceleration transducer.
In the processing meanss of a kind of nuclear power plant loose part vibration signal that the present invention provides, described piezoelectric type acceleration passes
Sensor is used for noisy vibration signal x (t) of first via during acquisition time t, and gathers the noisy vibration signal in the second tunnel after time τ
x(t+τ)；Noisy vibration signal x (t) of the described first via be represented by amplitude be A, frequency be f, initial phase beNoise is believed
Number for n (t) SIN function.
In the processing meanss of a kind of nuclear power plant loose part vibration signal that the present invention provides, described computing module is included certainly
Related operation module, decomposition operation module and noise reduction module：
Described auto-correlation computation module is used for carrying out auto-correlation computation to noisy vibration signal；
Described decomposition operation module is used for carrying out decomposition operation to described auto-correlation function, obtains described vibration signal oneself
Correlation function is RS(τ), the first cross-correlation function R of described vibration signal and noiseSN(τ) He the second cross-correlation function RNS(τ),
The auto-correlation function of described noise is RN(τ)；
Described noise reduction module be used for reducing the first cross-correlation function of described vibration signal and noise, described vibration signal and
The functional value of the auto-correlation function of the second cross-correlation function of noise and described noise.
In the processing meanss of a kind of nuclear power plant loose part vibration signal that the present invention provides, described processing module includes little
Ripple noise reduction module and inversion processing module；Described wavelet de-noising module is used for the noisy vibration signal after described noise reduction process is entered
Row wavelet de-noising is processed, and obtains the noisy vibration signal after wavelet de-noising is processed；Described inversion processing module is used for small echo inversion
Change the noisy vibration signal after processing described noise reduction process, frequency-region signal inversion is time-domain signal, obtain the vibration letter reconstructing
Number.
The beneficial effect that technical scheme is brought is：
The various noises being superimposed upon in these measured signals can be eliminated as much as possible and do under very noisy disturbed condition
Disturb it is ensured that the vibration signal collecting is reliable and stable, operating for operator's next step provides basis for estimation.
Brief description
In order to be illustrated more clearly that technical scheme, the accompanying drawing of required use simply will be situated between below
Continue, for those of ordinary skill in the art, on the premise of not paying creative work, can also obtain according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is a kind of flow process of the processing method of nuclear power plant loose part vibration signal that the embodiment of the present invention one provides
Figure.
Fig. 2 is the particular flow sheet of step S2 in Fig. 1.
Fig. 3 is the particular flow sheet of step S3 in Fig. 1.
Fig. 4 is that a kind of structure of the processing meanss of nuclear power plant loose part vibration signal that the embodiment of the present invention two provides is shown
It is intended to.
Specific embodiment
In order to solve to adopt low pass or the filtering method of band logical that loose part is monitored in existing nuclear power plant I＆C system
System acquisition to noisy vibration signal carry out the higher problem of false alarm rate of noise reduction, the invention provides a kind of nuclear power plant is loose
The processing method and processing device of dynamic component vibration signal, eliminates the various noises being superimposed upon in these measured signals as much as possible and does
Disturb, decomposed by the signal being gathered is entered with row operation, and noise reduction process is carried out to the signal after decomposing, the letter after being processed
Number carry out inversion again to process to reconstruct noisy vibration signal, to guarantee that the vibration signal collecting is reliable and stable.
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention
Formula is described in further detail.
Embodiment one
A kind of processing method of nuclear power plant loose part vibration signal that the present invention provides, referring to Fig. 1, the method includes：
S1, the noisy vibration signal of reality of collection nuclear power plant loose part.
In particular it is required that the collection noisy vibration signal of two-way.In time t, gather noisy vibration signal x (t) of the first via.
After elapsed time τ, gather the second tunnel noisy vibration signal x (t+ τ).The noisy vibration signal of two-way collecting is derived from same machine
Tool system.There is the physical link of certain intension between them.
Noisy vibration signal x (t) of the first via is represented by：
Wherein,For vibration signal to be measured, n (t) is noise signal, and A is amplitude, ω=2 π
F, f are frequency,For initial phase.
Correspondingly, the noisy vibration signal in the second tunnel x (t+ τ) is represented by：
X (t+ τ)=s (t+ τ)+n (t+ τ) (9)
A kind of processing method of nuclear power plant loose part vibration signal that the present invention provides also includes：
S2, according to noisy vibration signal, it is carried out with auto-correlation computation, and decompose obtain vibration signal auto-correlation function,
The auto-correlation function of noise and the cross-correlation function of vibration signal and noise.
Specifically, step S2 includes：S21, using auto-correlation function, auto-correlation computation is carried out to noisy vibration signal；S22、
Using analytic function, decomposition operation is carried out to described auto-correlation function；S23, the τ-value chosen in suitable function (9), reduce institute
State second cross-correlation function of the first cross-correlation function, described vibration signal and noise of vibration signal and noise and described noise
Auto-correlation function functional value, obtain the noisy vibration signal after described preliminary noise reduction process.
Used in S21, auto-correlation function is：
Wherein, x (t) is the noisy vibration signal of the first via, and x (t+ τ) is the noisy vibration signal in the second tunnel.The first via is noisy to shake
The noisy vibration signal of dynamic signal and the second tunnel is time-domain signal, and auto-correlation function passes through Fourier transformation, time-domain signal is changed
For frequency-region signal.
The function of x (t) and x (t+ τ) is updated in function (10), can get：
Above formula is launched, the analytic function of S22 use can be obtained：
Wherein, the auto-correlation function of vibration signal isIt is to shake
The tolerance of dynamic signal similarity in time t and t+ τ, only relevant with vibration signal itself.Signal and noise cross-correlation function can
Be divided into vibration signal and the first cross-correlation function of noise and the second cross-correlation function of vibration signal and noise, vibration signal and
First cross-correlation function of noise isDescription vibration signal when
Between t when and noise signal time t+ τ degree of correlation.Second cross-correlation function of vibration signal and noise isDescription vibration signal in time t+ τ and noise signal when
Between t degree of correlation.The auto-correlation function of noise isIt is to make an uproar
The tolerance of acoustical signal similarity in time t and t+ τ, only relevant with noise signal itself.
Assume the white Gaussian noise that noise is standard, then τ → ∞, R at that timeSN(τ)、RNS(τ) and RN(τ) all trend towards zero
Value, therefore can obtain ideally auto-correlation functionFrom above formula, in theory, through signal
Auto-correlation computation is it is possible to obtain accurate frequency information and amplitude information.
In Practical Project, τ can not possibly trend towards infinity, and the albefaction degree of noise may not be very good, thus leading to,
RSN(τ)、RNS(τ) and RN(τ) value differs and is set to zero, so that choosing suitable τ-value, to RSN(τ)、RNS(τ) and RN(τ)
Carry out noise reduction process.The scope of τ-value is [0, T], selects big τ-value as far as possible.After noise reduction process, new noise can be considered n(1)
(τ), then the noisy vibration signal after noise reduction process is represented by：
Compared with vibration signal x (t) noisy with the first via, although phase information lost after auto-correlation computation, but
Frequency does not change, and amplitude now also has parsing relation with original amplitude, therefore passes through spectrum analyses with accordingly
Calculating can also obtain frequency information and the amplitude information of original signal.Due to the new noise n producing(1)(τ) than original noise
Little, thus improve signal to noise ratio.It is to be understood that auto-correlation processing can carry out repeatedly, strong background noise signal being carried out many
Weight auto-correlation processing can obtain preferably filters function of making an uproar.
A kind of processing method of nuclear power plant loose part vibration signal that the present invention provides also includes：
S3, wavelet de-noising process is carried out to the noisy vibration signal after the preliminary noise reduction process of auto-correlation computation, obtain
Noisy vibration signal after wavelet de-noising process, carries out inversion process to the noisy vibration signal after described noise reduction process, with weight
Noisy vibration signal after noise reduction process described in structure.
Specifically, step S3 includes：S31, wavelet de-noising process is carried out to the noisy vibration signal after noise reduction process, will drop
The noisy vibration signal after processing of making an uproar decomposes the wavelet coefficient on different frequency bands, decomposition being obtained and carries out threshold process, will
Less than the wavelet coefficient zero setting of threshold value, realize reducing further noise signal, obtain the noisy vibration letter after wavelet de-noising is processed
Number；S32, to wavelet de-noising process after noisy vibration signal carry out wavelet inverse transformation process, by frequency-region signal inversion be time domain
Signal, obtains the vibration signal reconstructing.
Noisy vibration signal after noise reduction processIt is with regard to postponing the binary function with Doppler, due to τ
It is incoherent in itself with ω, so meeting the condition of one-dimensional wavelet de-noising.
Because noisy vibration signal is transformed to frequency domain by Fourier transform by auto-correlation computation, by low pass filter
When being filtered, the signal phenomenon overlapped with the frequency band of noise can be run into, cause filter effect to be deteriorated, thus consider to introduce
Wavelet de-noising.
Wavelet de-noising is substantially that the wavelet coefficient that decomposition is obtained is carried out at threshold value in signal decomposition to different frequency bands
Reason, will be less than wavelet coefficient (the representing noise signal) zero setting of threshold value, realizes reducing further noise signal.Threshold process is existing
There is technology, will not be described here.
Wavelet de-noising has good time-frequency characteristic, can preferably solve to produce filter effect variation due to integral operation
Problem, realize protection signal locality and remove noise between balance, can preferably reduce signal noise.
Wavelet inverse transformation is exactly to calculate noisy vibration signalInverse function, frequency-region signal can be inversely transformed into
Time domain, finally gives the vibration signal of time domain.
The present embodiment by noisy vibration signal is carried out auto-correlation processing, noise reduction process, wavelet de-noising process, small echo inverse
Conversion, eliminates various noises and the interference being superimposed upon in these measured signals as much as possible, improves signal to noise ratio.
Embodiment two
A kind of processing meanss of the nuclear power plant loose part vibration signal of the present invention also offer, referring to Fig. 2, this device bag
Include：Signal acquisition module 1, is arranged on nuclear reactor, the noisy vibration signal of the reality for gathering nuclear power plant's loose part.
Signal acquisition module 1 includes piezoelectric acceleration transducer 11.It is to be understood that piezoelectric acceleration transducer
11 can be multiple.Specifically, piezoelectric acceleration transducer 11 is arranged on the primary Ioops pressure boundary of nuclear power plant.Primary Ioops
There may be some metal objects, the bolt that for example comes off, screw etc. in pressure boundary.The part that these come off can be with pipeline
The flowing of interior liquid strikes on primary Ioops border, clashes into pressure and makes the electric capacity on piezoelectric acceleration transducer 11 produce shape
Become.After electric capacity is under pressure, the distance of the two poles of the earth up and down of electric capacity reduces, and electric charge changes and produces electric current, therefore, it is possible to gather
To vibration signal.
Piezoelectric acceleration transducer 11 gathers noisy vibration signal x (t) of the first via in time t.The first via is noisy to shake
Dynamic signal x (t) is represented by：
Wherein,For vibration signal to be measured, n (t) is noise signal, and A is amplitude, ω=2
π f, f are frequency,For initial phase.
Piezoelectric acceleration transducer 11 gathers the second tunnel noisy vibration signal x (t+ τ) after time τ.Correspondingly, second
Noisy vibration signal x (t) in road is represented by：
X (t+ τ)=s (t+ τ)+n (t+ τ) (15)
A kind of processing meanss of nuclear power plant loose part vibration signal that the present invention provides also include：
Computing module 2, connects signal acquisition module 1, for auto-correlation computation is carried out to it according to noisy vibration signal, and
Decompose the cross-correlation function of the auto-correlation function, the auto-correlation function of noise and vibration signal and noise obtaining vibration signal.
Specifically, computing module 2 includes auto-correlation computation module 21, decomposition operation module 22 and noise reduction module 23.
Auto-correlation computation module 21 is used for carrying out auto-correlation computation to noisy vibration signal, carries out auto-correlation computation use
Auto-correlation function is：
Wherein, x (t) is the noisy vibration signal of the first via, and x (t+ τ) is the noisy vibration signal in the second tunnel.Become by Fourier
Change, time-domain signal is converted to frequency-region signal.
Auto-correlation computation module 21 can be by the function of noisy for first via vibration signal x (t) and the second tunnel noisy vibration signal x
The function of (t+ τ) is updated in auto-correlation function, obtains：
Then, function (17) can be launched by decomposition operation module 22, obtains analytic function：
Wherein, the auto-correlation function of vibration signal isIt is to shake
The tolerance of dynamic signal similarity in time t and t+ τ, only relevant with vibration signal itself.Signal and noise cross-correlation function can
Be divided into vibration signal and the first cross-correlation function of noise and the second cross-correlation function of vibration signal and noise, vibration signal and
First cross-correlation function of noise isDescription vibration signal when
Between t when and noise signal time t+ τ degree of correlation.Second cross-correlation function of vibration signal and noise isDescription vibration signal in time t+ τ and noise signal when
Between t degree of correlation.The auto-correlation function of noise isIt is to make an uproar
The tolerance of acoustical signal similarity in time t and t+ τ, only relevant with noise signal itself.
The related personnel of nuclear power plant's loose part vibration signal processing can select τ-value as big as possible, by noise reduction mould
Block 23 is to RSN(τ)、RNS(τ) and RN(τ) carry out noise reduction process, improve the signal to noise ratio of vibration signal.
A kind of processing meanss of nuclear power plant loose part vibration signal that the present invention provides also include：Processing module 3, connects
Computing module 2, for carrying out wavelet de-noising process to the noisy vibration signal after the preliminary noise reduction process of auto-correlation computation, obtains
Noisy vibration signal after processing to wavelet de-noising, and the noisy vibration signal after noise reduction process is carried out inversion process, with weight
Noisy vibration signal after structure noise reduction process.
Specifically, processing module 3 includes wavelet de-noising module 31 and inversion processing module 32.
Noisy vibration signal after preliminary noise reduction process is carried out wavelet de-noising process by wavelet de-noising module 31, by noise reduction
Noisy vibration signal after process decomposes the wavelet coefficient on different frequency bands, decomposition being obtained and carries out threshold process, will be low
In the wavelet coefficient zero setting of threshold value, realize reducing further noise signal, obtain the noisy vibration signal after wavelet de-noising is processed.
Noisy vibration signal after wavelet de-noising is processed by inversion processing module 32 carries out wavelet inverse transformation process, specifically comes
Say to be exactly to calculate noisy vibration signalInverse function, by frequency-region signal inversion be time-domain signal, obtain reconstruct vibration
Signal.
The present embodiment passes through to gather the noisy vibration signal of reality of nuclear power plant's loose part, and noisy vibration signal is transported
Calculate, and noise reduction process is carried out to noisy vibration signal, the false alarm rate of nuclear power plant's I＆C system can be substantially reduced.
The embodiments of the present invention are for illustration only, do not represent the quality of embodiment.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all spirit in the present invention and
Within principle, any modification, equivalent substitution and improvement made etc., should be included within the scope of the present invention.
Claims (12)
1. the processing method of a kind of nuclear power plant loose part vibration signal, there may be in detection reaction reactor coolant system
Loose part it is characterised in that the method comprising the steps of：
S1, the noisy vibration signal of reality of collection nuclear power plant loose part；
S2, according to described noisy vibration signal, it is carried out with auto-correlation computation, and decompose obtain vibration signal auto-correlation function,
The auto-correlation function of noise and the cross-correlation function of vibration signal and noise, realize the preliminary noise reduction to noisy vibration signal
Process；
S3, wavelet de-noising process is carried out to the noisy vibration signal after the preliminary noise reduction process of auto-correlation computation, obtain small echo
Noisy vibration signal after noise reduction process, the noisy vibration signal inversion after described wavelet de-noising is processed is processed, to reconstruct
State the noisy vibration signal after wavelet de-noising is processed.
2. a kind of processing method of nuclear power plant according to claim 1 loose part vibration signal is it is characterised in that described
The noisy vibration signal of reality that step S1 collects is the after noisy vibration signal x (t) of the first via and time τ during time t
Two tunnels noisy vibration signal x (t+ τ).
3. a kind of processing method of nuclear power plant according to claim 2 loose part vibration signal is it is characterised in that described
Noisy vibration signal x (t) of the first via be represented by amplitude be A, frequency be that f, initial phase areNoise signal is for n (t) just
String function.
4. a kind of processing method of nuclear power plant according to claim 1 loose part vibration signal is it is characterised in that described
Step S2 concrete processing procedure includes：
S21, using auto-correlation function, auto-correlation computation is carried out to described noisy vibration signal；
S22, using analytic function, decomposition operation is carried out to described auto-correlation function；
The auto-correlation function that decomposition obtains described vibration signal is RS(τ), the first cross-correlation function of described vibration signal and noise
For RSN(τ), the second cross-correlation function R of described vibration signal and noiseNS(τ), the auto-correlation function of described noise is RN(τ)；
S23, the suitably described τ-value of selection, the first cross-correlation function of the described vibration signal of reduction and noise, described vibration signal
With the functional value of the second cross-correlation function of noise and the auto-correlation function of described noise, after obtaining described preliminary noise reduction process
Noisy vibration signal.
5. a kind of processing method of nuclear power plant according to claim 1 loose part vibration signal is it is characterised in that described
Step S3 concrete processing procedure includes：
S31, wavelet de-noising process is carried out to the noisy vibration signal after described preliminary noise reduction process, after described noise reduction process
Noisy vibration signal decomposes the wavelet coefficient on different frequency bands, decomposition being obtained and carries out threshold process, will be less than threshold value
Wavelet coefficient zero setting, realizes reducing further noise signal, obtains the noisy vibration signal after wavelet de-noising is processed；
S32, to described wavelet de-noising process after noisy vibration signal carry out wavelet inverse transformation process, frequency-region signal inversion is
Time-domain signal, obtains the vibration signal reconstructing.
6. a kind of processing method of nuclear power plant according to claim 5 loose part vibration signal is it is characterised in that described
The scope of τ-value is [0, T].
7. a kind of processing method of nuclear power plant according to claim 5 loose part vibration signal is it is characterised in that described
Noisy vibration signal after noise reduction process is represented by with regard to postponing the binary function with frequency.
8. a kind of processing meanss of nuclear power plant loose part vibration signal are it is characterised in that described device includes：
Signal acquisition module, is arranged on nuclear reactor, the noisy vibration signal of the reality for gathering nuclear power plant's loose part；
Computing module, connects described signal acquisition module, for auto-correlation computation is carried out to it according to described noisy vibration signal,
And decompose the cross-correlation letter of the auto-correlation function, the auto-correlation function of noise and vibration signal and noise obtaining vibration signal
Number, realizes the preliminary noise reduction process to noisy vibration signal；
Processing module, connects described calculating decomposing module, for carrying out to the signal after the preliminary noise reduction process of auto-correlation computation
Wavelet de-noising is processed, and obtains the noisy vibration signal after wavelet de-noising is processed, and the noisy vibration after described noise reduction process is believed
Number carry out inversion process, to reconstruct the noisy vibration signal after described noise reduction process.
9. a kind of processing meanss of nuclear power plant according to claim 8 loose part vibration signal are it is characterised in that described
Signal acquisition module includes piezoelectric acceleration transducer.
10. a kind of processing meanss of nuclear power plant according to claim 9 loose part vibration signal are it is characterised in that institute
State piezoelectric acceleration transducer for noisy vibration signal x (t) of first via during acquisition time t, and collection the after time τ
Two tunnels noisy vibration signal x (t+ τ)；Noisy vibration signal x (t) of the described first via be represented by amplitude be A, frequency be f, initial
Phase place isNoise signal is the SIN function of n (t).
A kind of processing meanss of 11. nuclear power plant according to claim 10 loose part vibration signals are it is characterised in that institute
State computing module and include auto-correlation computation module, decomposition operation module and noise reduction module：
Described auto-correlation computation module is used for carrying out auto-correlation computation to noisy vibration signal；
Described decomposition operation module is used for carrying out decomposition operation to described auto-correlation function, obtains the auto-correlation of described vibration signal
Function is RS(τ), the first cross-correlation function R of described vibration signal and noiseSN(τ) He the second cross-correlation function RNS(τ), described
The auto-correlation function of noise is RN(τ)；
Described noise reduction module is used for reducing the first cross-correlation function, described vibration signal and the noise of described vibration signal and noise
The second cross-correlation function and described noise auto-correlation function functional value.
A kind of processing meanss of 12. nuclear power plant according to claim 8 loose part vibration signals are it is characterised in that institute
State processing module and include wavelet de-noising module and inversion processing module；After described wavelet de-noising module is used for described noise reduction process
Noisy vibration signal carry out wavelet de-noising process, obtain wavelet de-noising process after noisy vibration signal；Described inversion is processed
Module is used for the noisy vibration signal after wavelet inverse transformation processes described noise reduction process, and frequency-region signal inversion is time-domain signal,
Obtain the vibration signal reconstructing.
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| CN109357753A (en) * | 2018-11-07 | 2019-02-19 | 深圳中广核工程设计有限公司 | The system and method for reducing the loosening part and vibration monitoring false alarm rate of nuclear power plant |
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| CN109408938A (en) * | 2018-10-18 | 2019-03-01 | 哈尔滨工业大学 | A kind of maritime entry grates noise optimization method |
| CN109408938B (en) * | 2018-10-18 | 2022-05-06 | 哈尔滨工业大学 | Method for optimizing noise of grating at sea entrance |
| CN109357753A (en) * | 2018-11-07 | 2019-02-19 | 深圳中广核工程设计有限公司 | The system and method for reducing the loosening part and vibration monitoring false alarm rate of nuclear power plant |
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