CN110285331A - A kind of natural gas line safety monitoring velocity of sound compensation technique based on resampling methods - Google Patents
A kind of natural gas line safety monitoring velocity of sound compensation technique based on resampling methods Download PDFInfo
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- CN110285331A CN110285331A CN201910535543.6A CN201910535543A CN110285331A CN 110285331 A CN110285331 A CN 110285331A CN 201910535543 A CN201910535543 A CN 201910535543A CN 110285331 A CN110285331 A CN 110285331A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
- F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
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Abstract
The natural gas line safety monitoring velocity of sound compensation technique based on resampling methods that the present invention relates to a kind of, belongs to natural gas line on-line monitoring field.The process includes: that the master reference signal of multifunctional data acquisition card acquisition and detection signal are transmitted to host computer first to carry out data processing；Meanwhile current time environment temperature is recorded when acquiring master reference signal and detection signal；Then, by matched filterings, treated that detection signal carries out resampling and uniformly under reference signal to all；Envelope extraction and envelope subtraction finally are carried out to reference signal after resampling and detection signal, natural gas line Hydrate Plugging and pipe leakage precise positioning can be realized.It is a major advantage of the invention that can effectively eliminate sonic velocity change by the velocity of sound compensation technique based on resampling methods causes noise jamming and position error, realize that Hydrate Plugging and pipe leakage are accurately positioned.
Description
Technical field
The natural gas line safety monitoring velocity of sound compensation technique based on resampling methods that the present invention relates to a kind of belongs to natural
Feed channel on-line monitoring field.
Background technique
Natural gas easily forms natural gas when temperature and pressure is met certain condition during exploitation, processing sum aggregate are defeated
Hydrate, gently then interfere natural gas normally produce with transport, it is heavy then cause serious safety accident.In addition, gas pipeline leakage
Accident equally will cause serious Loss of Life and property.Therefore, to gas hydrates blocking and pipe leakage monitoring and
Precise positioning is of great significance to pipe safety operation.
Currently, industry has carried out a series of researchs to natural gas line safety monitoring and has announced corresponding achievement.For day
Pressure wave attenuation in right feed channel follows certain rule, therefore studies pressure wave attenuation characteristic, while by Hydrate Plugging pipe
Road is compared with the differential declines characteristic in the case of vacant duct, it is estimated that the degree of Hydrate Plugging.For detection pipe
Road leakage, a kind of leakage detecting and locating method based on dynamic pressure wave attenuation model are suggested, and this method is based on spread speed
Maximum positioning error can be reduced to 0.054% with the time difference.Another kind can based on the pipeline leakage detection method of passive acoustics
Remotely to detect acoustical signal, positions leak and determine leak size.In addition, a kind of combination compressed sensing and deep learning reason
The intelligent pipeline leakage aperture recognition methods of opinion is suggested, and this method can realize the high-precision classification identification in leakage aperture.However,
The above method cannot carry out the detection and positioning of Hydrate Plugging and pipe leakage simultaneously.
It is a kind of based on active acoustical excitation natural gas line on-line monitoring method can simultaneously hydrate and pipeline
The detection and positioning of leakage.Later, two methods of wavelet packet analysis and chaotic Property Analysis are successively proposed to distinguish hydrate
Blocking and pipe leakage.Then, the above method does not compensate sonic velocity change caused by variation of ambient temperature.However, real
Typical temperature is non-constant in the case of border, and the velocity of sound can also change therewith.Therefore, anti-caused by the normal pipelines event such as bend, valve
It penetrates summit to appear in reference signal and detect the different location of signal, subtracts each other result so as to cause envelope and generate additional noise.If
Ignore the variation of the velocity of sound, then the reflection peak as caused by Hydrate Plugging and pipe leakage also occurs that drift, so as to cause serious
Position error.
Therefore, resampling is carried out with unified to reference signal to the detection signal after matched filtering using resampling methods
Under, envelope extraction and envelope difference operation then are carried out to reference signal after resampling and detection signal, that is, difference fortune can be improved
The signal-to-noise ratio and positioning accuracy of result are calculated, realizes natural gas line Hydrate Plugging and pipe leakage precise positioning.
Summary of the invention
The natural gas line safety monitoring velocity of sound compensation technique based on resampling methods that the object of the present invention is to provide a kind of,
The technology can effectively eliminate sonic velocity change and cause noise jamming and position error, realize that Hydrate Plugging and pipe leakage are accurately fixed
Position.
The technical solution of the present invention is as follows: a kind of natural gas line safety monitoring velocity of sound based on resampling methods compensates skill
Art includes the following steps:
1) computer or signal generator (1) generate transmitting signal and export through multifunctional data acquisition card (2)；
2) transmitting signal is amplified using power amplifier (3) with drive be fixed on the sound source (4) of pipeline head end to
Emit acoustic signals in pipeline；
3) when reflected sonic signals encounter pipeline normal event (6) and Hydrate Plugging (7) and pipe leakage (8) Shi Huifa
Raw reflection；
4) pipeline head end sound source (4) nearby fix sound wave detection sensor (5) to receive reflection signal, then export to
Multifunctional data acquisition card (2)；
5) the master reference signal of multifunctional data acquisition card (2) acquisition computer is transmitted to detection signal to count
According to processing；
6) current time environment temperature is recorded when acquiring master reference signal and detection signal；
7) resampling is carried out to the detection signal after all data processings, detailed process includes the following steps:
(1) relative distance for assuming sonic detection sensor and normal pipeline event is S, then reflection caused by normal pipeline
Peak index are as follows:
Wherein, TsMultifunctional data acquisition card sampling period when running for system, c are transmitting acoustic signals in natural gas tube
Spread speed in road.
(2) when variation of ambient temperature, the relationship of the velocity of sound and environment temperature are as follows:
Wherein, TiFor environment temperature.
(3) resampling is carried out to the detection signal after all data processings and uniformly under reference signal, resampling because
Sub- M/L:
Wherein, I0And IiRespectively reflection peak caused by pipeline event indexes in reference signal and detection signal, c0And ciFor
The corresponding velocity of sound, T0And TiFor corresponding environment temperature.The rational factor resampling detailed process includes: first rise with factor L adopting
Then sample is carried out again with factor M down-sampled.It rises in sampling process, acquired original signal sequence x [n] is expanded with integer factor L
Then exhibition is L by a gain, the low-pass filter that cutoff frequency is π/L.During down-sampled, x [n] first passes through one
The low-pass filter that gain is 1, cutoff frequency is π/M, then compressed with integer factor M.
8) subtract each other finally, carrying out envelope extraction with detection signal to reference signal after resampling with envelope, day can be realized
The precise positioning of right feed channel Hydrate Plugging and pipe leakage.
The transmitting acoustic signals are chirp pulse signal, and sonic energy signal, frequency domain bandwidth, duration are equal
It is adjustable.
The master reference signal and detection signal are transmitted to computer and carry out data processing as matched filtering processing.
The current time environment temperature is Centigrade ambient temperature.
The resampling is the resampling of the rational factor.
The rational factor resampling process are as follows: a liter sampling is first carried out with integer factor L, then with integer factor M progress
It is down-sampled.
First advantage of the present invention is adaptively correct detection signal and its envelope using resampling methods
The drift of line；Second advantage is to compensate sonic velocity change using resampling methods, effectively eliminates additional noise
Interference improves signal-to-noise ratio；Third advantage is that natural gas line Hydrate Plugging and pipe leakage positioning accuracy can be improved.
Detailed description of the invention
Fig. 1 is data acquisition of the invention, processing and analysis flow chart diagram.
Fig. 2 is monitoring system layout of the invention.Monitoring system include: 1 be computer, 2 be multifunctional data acquiring
Card, 3 be power amplifier, 4 be sound source, 5 be sonic detection sensor.
Fig. 3 is Hydrate Plugging testing result figure before resampling of the invention.
Fig. 4 is Hydrate Plugging testing result figure after resampling of the invention.
Fig. 5 is resampling front and rear pipes leak detection result figure of the invention.
Fig. 6 is that resampling front and rear pipes of the invention leak the dynamic monitor result figure.
Specific embodiment
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:
Fig. 1 show the data acquisition of entirety of the invention, processing, analysis flow chart diagram.Detailed process is as follows: A, former in acquisition
Current time environment temperature is recorded when primordium calibration signal and detection signal；B, master reference signal is matched with detection signal
Filtering processing；C, signal will be detected after matched filtering and carry out resampling, mutually unify with reference signal；D, benchmark after resampling is believed
Number with detection signal carry out envelope extraction；E, signal is detected after resampling and reference signal carries out envelope subtraction, and day can be realized
Right feed channel Hydrate Plugging and pipe leakage precise positioning.
Fig. 2 show the configuration diagram of the natural gas line safety monitoring system based on resampling methods, the monitoring system packet
It includes: computer or signal generator 1, multifunctional data acquisition card 2, power amplifier 3, sound source 4, sonic detection sensor 5, just
Ordinary affair part 6, Hydrate Plugging 7 and pipe leakage 8.
Computer or signal generator 1 generate transmitting signal and export through multifunctional data acquisition card 2；Utilize power amplifier
3 pairs of transmitting signals are amplified to drive the sound source 4 for being fixed on pipeline head end to emit acoustic signals into pipeline；Work as reflected acoustic wave
Signal can reflect when encountering pipeline normal event 6 or Hydrate Plugging 7 and pipe leakage 8；Near pipeline head end sound source 4
Fixed sound wave detection sensor 5 to receive reflection signal, then export to multifunctional data acquisition card 2 and be transmitted to computer into
Row data processing；Current time environment temperature is recorded when acquiring master reference signal and detection signal；To all data processings
Rear detection signal carries out resampling and uniformly under reference signal；Finally, to reference signal after resampling and detection signal into
Row envelope extraction is subtracted each other with envelope, and the precise positioning of natural gas line Hydrate Plugging and pipe leakage can be realized.
In order to verify the validity of the natural gas line safety monitoring velocity of sound compensation technique based on resampling methods, such as scheming
Simulating hydrate blocking and pipe leakage experiment are carried out in monitoring system shown in 2.Wherein, transmitting signal is linear FM signal,
Frequency is 600Hz-1100Hz, and duration 0.02s, multifunctional data acquisition card sample rate is 100Ks/s.
Fig. 3 (a) is that resampling preceding pipeline tail end reflects signal partial enlarged view.As shown in Fig. 3 (b), due to the change of the velocity of sound
Change, detects signal and its obvious drift occurs in envelope.Therefore, the signal-to-noise ratio of envelope subtraction result seriously reduces.Fig. 3 (c) is (b)
Partial enlarged view, reflection peak caused by Hydrate Plugging is submerged in reflection signal and pipeline caused by pipeline normal event completely
Tail end reflects in noise caused by signal drift.
Fig. 4 (a) is pipeline tail end reflection signal partial enlarged view after resampling.Resampling is carried out to detection signal then to mention
Envelope is taken, as a result as shown in Fig. 4 (b), matched filtering detection signal and its envelope drift are corrected.As Fig. 4 (b) and its part are put
Shown in big figure (c), noise jamming is significantly reduced, and signal-to-noise ratio is improved to 8.3dB.In addition, the positioning result of Hydrate Plugging such as table 1
It is shown.
1 Hydrate Plugging positioning result of table
Fig. 5 (a) and its partial enlarged view (b) are that resampling preceding pipeline leaks envelope subtraction result, it is seen that pipe leakage is drawn
The reflection peak risen is submerged in completely caused by reflection signal caused by pipeline normal event and pipeline tail end reflection signal drift
In noise.Fig. 5 (c) and its partial enlarged view (d) are pipe leakage envelope subtraction result after resampling, and noise jamming significantly drops
Low, signal-to-noise ratio is improved to 7.34dB.In addition, pipe leakage positioning result is as shown in table 2.
2 pipe leakage positioning result of table
Fig. 6 (a) is that resampling preceding pipeline leaks dynamic monitoring envelope subtraction result, and wherein envelope caused by temperature change subtracts
Obvious offset occurs for method result.After resampling, the offset of envelope subtraction result caused by temperature change is corrected, such as Fig. 6 (b) institute
Show.Fig. 6 (c) and (d) are respectively resampling front and rear pipes leakage dynamic monitoring positioning result, and pipe leakage dynamic is supervised after resampling
It surveys repetitive positioning accuracy to significantly improve, specific positioning result is as shown in table 3.
3 pipe leakage the dynamic monitor result of table
Claims (6)
1. a kind of natural gas line safety monitoring velocity of sound compensation technique based on resampling methods, it is characterised in that including following mistake
Journey:
1) computer or signal generator generate transmitting signal and export through multifunctional data acquisition card；
2) transmitting signal is amplified to drive the loudspeaker for being fixed on pipeline head end to send out into pipeline using power amplifier
Penetrate acoustic signals；
3) it can be reflected when reflected sonic signals encounter pipeline normal event or Hydrate Plugging and pipe leakage；
4) sound wave detection sensor is fixed near pipeline head end loudspeaker to receive reflection signal, then exported to multi-functional number
According to capture card；
5) the master reference signal of multifunctional data acquisition card acquisition and detection signal are transmitted to computer and carry out data processing；
6) current time environment temperature is recorded when acquiring master reference signal and detection signal；
7) resampling is carried out to the detection signal after all data processings, detailed process includes the following steps:
(1) relative distance for assuming sonic detection sensor and normal pipeline event is S, then reflection peak rope caused by normal pipeline
It is cited as:
Wherein, TsMultifunctional data acquisition card sampling period when running for system, c are transmitting acoustic signals in natural gas line
Spread speed.
(2) when variation of ambient temperature, the relationship of the velocity of sound and environment temperature are as follows:
Wherein, TiFor environment temperature.
(3) resampling is carried out to the detection signal after all data processings and uniformly under reference signal, resampling factor M/
L:
Wherein, I0And IiRespectively reflection peak caused by pipeline event indexes in reference signal and detection signal, c0And ciIt is corresponding
The velocity of sound, T0And TiFor corresponding environment temperature.The rational factor resampling detailed process includes: first rise with factor L adopting
Then sample is carried out again with factor M down-sampled.It rises in sampling process, acquired original signal sequence x [n] is expanded with integer factor L
Then exhibition is L by a gain, the low-pass filter that cutoff frequency is π/L.During down-sampled, x [n] first passes through one
The low-pass filter that gain is 1, cutoff frequency is π/M, then compressed with integer factor M.
8) subtract each other finally, carrying out envelope extraction with detection signal to reference signal after resampling with envelope, natural gas can be realized
The precise positioning of pipeline Hydrate Plugging and pipe leakage.
2. a kind of natural gas line safety monitoring velocity of sound compensation technique based on resampling methods as described in claim 1,
Be characterized in that: the transmitting acoustic signals are chirp pulse signal, and sonic energy signal, frequency bandwidth, time domain impulse
Width is adjustable.
3. a kind of natural gas line safety monitoring velocity of sound compensation technique based on resampling methods as described in claim 1,
Be characterized in that: the master reference signal and detection signal are transmitted to computer and carry out data processing as matched filtering processing.
4. a kind of natural gas line safety monitoring velocity of sound compensation technique based on resampling methods as described in claim 1,
Be characterized in that: the current time environment temperature is Centigrade ambient temperature.
5. a kind of natural gas line safety monitoring velocity of sound compensation technique based on resampling methods as described in claim 1,
Be characterized in that: the resampling is the resampling of the rational factor.
6. a kind of natural gas line safety monitoring velocity of sound compensation technique based on resampling methods as described in claim 1,
It is characterized in that；The rational factor resampling carries out a liter sampling to be first with factor L, then down-sampled with factor M progress.
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