CN106990166A - A kind of hydraulic machinery cavitation and biphase gas and liquid flow monitoring method and device - Google Patents
A kind of hydraulic machinery cavitation and biphase gas and liquid flow monitoring method and device Download PDFInfo
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- CN106990166A CN106990166A CN201710216613.2A CN201710216613A CN106990166A CN 106990166 A CN106990166 A CN 106990166A CN 201710216613 A CN201710216613 A CN 201710216613A CN 106990166 A CN106990166 A CN 106990166A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/02—Analysing fluids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/021—Gases
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
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Abstract
The invention discloses a kind of hydraulic machinery cavitation and biphase gas and liquid flow monitoring method and device, the non-contact measuring technology method and apparatus with reference to active ultrasonic technology, digital demodulation signal technology and SVMs identification technology are refered in particular to.Including placing ultrasonic transducer, setting up the devices such as step and ultrasonic transducer, acoustics capture card, computer, signal acquiring system, Signal Analysis System such as fluidised form grader, data acquisition, data analysis identification.The present invention has the advantages that the small interference of convenient disassembly, non-intervention installation to system operation, signal strong antijamming capability and accurate to flowing condition adjudgement.Present invention can apply to the real-time monitoring of hydraulic running status.
Description
Technical field
The present invention is a kind of fluidised form monitoring method and device, it is adaptable to the diagnosis of bubble in hydraulic, is refered in particular to using master
Monitoring method and device when dynamic ultrasonic technique occurs cavitation to hydraulic or there is biphase gas and liquid flow.
Background technology
Hydraulic be involve the interests of the state and the people and national security strategy equipment, as important energy conversion device,
Hydraulic is widely used in each department of national economy, is not only the nucleus equipment of power station and pumping plant, be also thermoelectricity and
The key equipment of nuclear power, while being also widely used in the sophisticated technology such as submarine, naval vessel, Aero-Space field.In order to meet state
Family's safety and the demand of development of the national economy development, hydraulic are sent out to maximization, high speed, high-power and high-performance direction
Exhibition, energy-saving and emission-reduction and safe and stable operation to hydraulic propose higher and higher requirement.Cavitation refers to local in liquid
When pressure is reduced, the formation in the hole (vacuole) of steam or gas, the mistake for developing and crumbling and fall on liquid internal or the solid interface of liquid
Journey, as hydraulic develops to high speed direction, its Cavitation Problems seems especially prominent.Pipeline is damaged in fluid delivery process
Hydraulic can be caused to be run under the conditions of biphase gas and liquid flow.Can there is bubble under the conditions of cavitation and biphase gas and liquid flow, cause
The vibration of hydraulic flow and pressure, and influence the operation stability of pipe-line system or even cause structure to destroy, produce simultaneously
Larger vibration noise.Therefore, hydraulic machinery cavitation and biphase gas and liquid flow state are monitored in time most important.Conventional
Detection method has energy method, High Speed Photography, dodges frequency observation method and carries out state recognition based on pressure, vibration and acoustic signal
Method.Energy method is that, by measuring hydraulic performance, but this method directly can not definitely monitor cavitation and biphase gas and liquid flow
Occur, when penalty, cavitation or liquid void fraction degree are very serious.High Speed Photography, sudden strain of a muscle frequency observation method are
Refer to the method for whether thering is bubble to adhere to using visual means observation blade surface, but be due to the limitation of structure, this kind of side
Method is difficult to be applied in engineering.The patent of invention of Application No. 201610144665.9 discloses a kind of band pressure sensor and peace
The reinforcing centrifugal pump of pedestal is filled, cavitation condition is identified using the method for monitoring pressure fluctuation, but this method is to centrifugal pump
Flow passage structure is destroyed, and other accidentalia may also cause the change of fluctuating signal, causes wrong report.It is other to use sensing
There is a certain degree of installation and signal interference problem, and each cavitation developing stage and different void fraction conditions in the method for device
Flow characteristic and nonlinear change caused by lower, fluidised form identification are more difficult.Therefore, how quickly, it is convenient, reliably utilize various things
Hydraulic machinery cavitation and biphase gas and liquid flow state are identified reason variable, are urgent problems to be solved.
It is of the present invention when being monitored on hydraulic machinery cavitation and biphase gas and liquid flow to be based on active ultrasonic skill through retrieval
Art and SVMs fluidised form identification monitoring method and device do not have relevant report.
The content of the invention
It is waterpower it is an object of the invention to provide a kind of hydraulic machinery cavitation and biphase gas and liquid flow monitoring method and device
Mechanical cavitation is easy to solve conventional monitoring methods and device with providing a kind of contactless monitoring technology when there is biphase gas and liquid flow
Be disturbed and it is more difficult install etc. problem, be that the reliability service of hydraulic system provides safeguard.
In order to solve the above technical problems, the present invention based on active ultrasonic technology, digital demodulation signal technology and support to
The non-contact measuring technology method and apparatus of amount machine identification technology, concrete technical scheme is as follows：
A kind of hydraulic machinery cavitation and biphase gas and liquid flow monitoring method, it is characterised in that：Method using transmitting ultrasonic carrier is complete
Into the real-time monitoring of stream field, when occurring cavitation or there is biphase gas and liquid flow, flow field certainly exists bubble and influences the stream of fluid
Dynamic, the information will be modulated on ultrasonic carrier；By the demodulation to signal kurtosis, so carry out signature analysis, feature extraction and
Feature selecting, is based ultimately upon SVMs identification technology and sets up the real-time monitoring that fluidised form grader completes fluidised form, specifically include
Following steps：
Step one, ultrasonic transducer is placed：Ultrasonic transducer is arranged on to the outlet of hydraulic, transducing using non-intervention mode
Device and the contact surface keeping parallelism of outlet conduit two, in order to using transmitting ultrasonic carrier, and cavitation or there is gas-liquid two-phase
Flow field certainly exists bubble during stream, while meeting fluid motion produces influence, the information can be reflected on ultrasonic carrier；
Step 2, sets up grader：Based on data processing software platform using SVMs (SVM) method to non-cavitating, sky
The ultrasonic carrier signal that flow field is reflected when changing the different phase of development, different import void fractions is demodulated, and passes through grader
Training process set up the various fluidised form graders that there is cavitation or gas-liquid two-phase flow phenomenon；
Step 3, carries out the collection of signal：Program is write to not cocurrent flow using data collecting card and corresponding data acquisition software
Ultrasonic carrier signal under state carries out high-speed and continuous collection, in order to carried using ultrasound under the different operating conditions of hydraulic
Ripple signal carries out analysis analysis；
Step 4, data analysis：Amplitude demodulation of the program completion to collection signal, and root are write by data processing software platform
According to foundation different cavitations or gas-liquid two-phase flow phenomenon when fluidised form grader the data sample gathered in real time is classified, it is complete
The judgement of its paired flow regime, exports monitoring result.
The data processing software refers to Matlab, Mathmatica or Fortran, can be by programming language to signal number
According to the software handled.
The data collecting card and corresponding data acquisition software refer to NI acoustics capture card and Labview softwares, LMS
Data acquisition front and terminal and other manufacturer productions can be set to any one that ultrasonic carrier data signal is acquired
It is standby.
A kind of hydraulic machinery cavitation and biphase gas and liquid flow monitoring device, it is characterised in that including：Ultrasonic transducer (1), sound
Learn capture card (2), computer (3), signal acquiring system (4) and Signal Analysis System (5)；The ultrasonic transducer (1) is laid
Hydraulic outlet, and with the contact surface keeping parallelism of pipeline two；The acoustics capture card (2) and ultrasonic transducer (1) and meter
Calculation machine (3) is connected, and the continuous of ultrasonic carrier signal under different fluidised forms is completed by dress data acquisition program in a computer
High speed acquisition simultaneously directly carries out state recognition in data processor.
The device have the advantages that：The present invention is by using ultrasonic through-transmission technique scheme so that different cavitations or gas
Information of flow under liquid two-phase state is converted into recognizable data signal；By using the pattern-recognition skill of SVMs
Art scheme so that the different cavitation developing stage of hydraulic interior flow field and different flow pattern of gas-liquid two-phase flow are sentenced automatically
It is disconnected, realize monitoring in real time.Method and apparatus of the present invention fluidised form under the conditions of hydraulic machinery cavitation or biphase gas and liquid flow is supervised
There is the small interference of convenient disassembly, non-intervention installation to system operation, signal strong antijamming capability and to flowing shape in terms of survey
The advantages of state accuracy of judgement.
Brief description of the drawings
Fig. 1：The hydraulic machinery cavitation of the present invention monitors flow chart with biphase gas and liquid flow
Fig. 2：Centrifugal pump biphase gas and liquid flow condition monitoring tests platform to be measured
Fig. 3：Ultrasonic transducer installation site
Fig. 4：Data demodulating algorithm design principle figure
In figure：1. ultrasonic transducer；2. capture card；3. computer；4. data acquisition software；5. DAS；6.
Centrifugal pump；7. outlet valve；8. water pot；9. vavuum pump；10. inlet ball valve；11. water ga(u)ge；12. compressor；13.
Gas flow controller；14. check valve；15. air and liquid mixer.
Embodiment
The specific embodiment of the present invention is described further below in conjunction with the accompanying drawings.
As shown in figure 1, installing ultrasonic transducer in hydraulic to be measured outlet first, and build real time data acquisition sum
According to processing platform, data demodulation is carried out after gathered data, SVMs pattern-recognition is then based on and extracts characteristic of division and root
Flow pattern discrimination is carried out according to grader, it is which kind of void fraction interval belonged to finally to export fluidised form monitoring result.
As shown in Fig. 2 simulated experiment is carried out before monitoring, including ultrasonic transducer 1, capture card 2, computer 3, data acquisition
Software 4, the data acquisition and analysis system of the formation of DAS 5, and pass through centrifugal pump 6, outlet valve 7, water pot 8, vavuum pump
9th, inlet ball valve 10, water ga(u)ge 11, compressor 12, gas flow controller 13, check valve 14, air and liquid mixer 15 and phase
Close pipeline and constitute experimental system together.Vacuumize to simulate the different cavitation developing stage of centrifugal pump by vavuum pump, form empty
Change the sample of fluidised form part.The centrifugation under different void fractions is simulated by way of compressor injects gas toward water circulation system
Pump gas liquid two-phase phenomenon, forms the sample of fluidised form part under the conditions of biphase gas and liquid flow.
As shown in figure 3, ultrasonic transducer is arranged on outlet of centrifugal pump pipeline, it is parallel with the both ends of the surface of pipeline.
As shown in figure 4, by carrying out data acquisition formation under different cavitations and biphase gas and liquid flow phenomenon to centrifugal pump
Sample is handled, and is demodulated by data, and data training, feature extraction, feature selecting, shape are carried out based on SVMs technology
Into tagsort table and fluidised form grader.
Claims (4)
1. a kind of hydraulic machinery cavitation and biphase gas and liquid flow monitoring method, it is characterised in that：Using the method for transmitting ultrasonic carrier
The real-time monitoring of stream field is completed, flow field certainly exists bubble and influences fluid when occurring cavitation or there is biphase gas and liquid flow
Flowing, the information will be modulated on ultrasonic carrier；By the demodulation to signal kurtosis, and then carry out signature analysis, feature extraction
And feature selecting, it is based ultimately upon SVMs identification technology and sets up the real-time monitoring that fluidised form grader completes fluidised form, specific bag
Include following steps：
Step one, ultrasonic transducer is placed：Ultrasonic transducer is arranged on to the outlet of hydraulic, transducing using non-intervention mode
Device and the contact surface keeping parallelism of outlet conduit two, in order to using transmitting ultrasonic carrier, and cavitation or there is gas-liquid two-phase
Flow field certainly exists bubble during stream, while meeting fluid motion produces influence, the information can be reflected on ultrasonic carrier；
Step 2, sets up grader：Based on data processing software platform using SVMs (SVM) method to non-cavitating, sky
The ultrasonic carrier signal that flow field is reflected when changing the different phase of development, different import void fractions is demodulated, and passes through grader
Training process set up the various fluidised form graders that there is cavitation or gas-liquid two-phase flow phenomenon；
Step 3, carries out the collection of signal：Program is write to not cocurrent flow using data collecting card and corresponding data acquisition software
Ultrasonic carrier signal under state carries out high-speed and continuous collection, in order to carried using ultrasound under the different operating conditions of hydraulic
Ripple signal carries out analysis analysis；
Step 4, data analysis：Amplitude demodulation of the program completion to collection signal, and root are write by data processing software platform
According to foundation different cavitations or gas-liquid two-phase flow phenomenon when fluidised form grader the data sample gathered in real time is classified, it is complete
The judgement of its paired flow regime, exports monitoring result.
2. a kind of hydraulic machinery cavitation according to claim 1 and biphase gas and liquid flow monitoring method, it is characterised in that：It is described
Data processing software refers to Matlab, Mathmatica or Fortran, signal data can be handled by programming language
Software.
3. a kind of hydraulic machinery cavitation according to claim 1 and biphase gas and liquid flow monitoring method, it is characterised in that：It is described
Data collecting card and corresponding data acquisition software refer to NI acoustics capture card and Labview softwares, LMS data acquisition fronts
With terminal and any equipment that can be acquired to ultrasonic carrier data signal of other manufacturer productions.
4. implementing a kind of hydraulic machinery cavitation described in claim 1 ~ 3 and the monitoring device of biphase gas and liquid flow monitoring method, it is special
Levy and be to include：Ultrasonic transducer (1), acoustics capture card (2), computer (3), signal acquiring system (4) and signal analysis system
Unite (5)；The ultrasonic transducer (1) be placed in hydraulic outlet, and with the contact surface keeping parallelism of pipeline two；The acoustics is adopted
Truck (2) is connected with ultrasonic transducer (1) and computer (3), is completed not by the data acquisition program of dress in a computer
Continuous high speed with ultrasonic carrier signal under fluidised form gathers and state recognition is directly carried out in data processor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710216613.2A CN106990166A (en) | 2017-04-05 | 2017-04-05 | A kind of hydraulic machinery cavitation and biphase gas and liquid flow monitoring method and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710216613.2A CN106990166A (en) | 2017-04-05 | 2017-04-05 | A kind of hydraulic machinery cavitation and biphase gas and liquid flow monitoring method and device |
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| CN106990166A true CN106990166A (en) | 2017-07-28 |
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| CN201710216613.2A Pending CN106990166A (en) | 2017-04-05 | 2017-04-05 | A kind of hydraulic machinery cavitation and biphase gas and liquid flow monitoring method and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111553373A (en) * | 2020-04-30 | 2020-08-18 | 上海理工大学 | CNN + SVM-based pressure bubble image recognition algorithm |
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| CN101091105A (en) * | 2005-08-12 | 2007-12-19 | 迅捷公司 | Flow measurement and control with bubble detection |
| CN102033106A (en) * | 2010-11-12 | 2011-04-27 | 中国科学院声学研究所 | Device and method for active ultrasonic detection of fluid cavitation |
| CN102095796A (en) * | 2010-11-12 | 2011-06-15 | 中国科学院声学研究所 | Device and method for detecting fluid cavitation by combining active ultrasonic with passive acoustics |
| CN105181793A (en) * | 2015-05-14 | 2015-12-23 | 中国人民解放军国防科学技术大学 | Method for measurement of two-phase flow gas holdup based on ultrasonic two-frequency signal |
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2017
- 2017-04-05 CN CN201710216613.2A patent/CN106990166A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101091105A (en) * | 2005-08-12 | 2007-12-19 | 迅捷公司 | Flow measurement and control with bubble detection |
| CN102033106A (en) * | 2010-11-12 | 2011-04-27 | 中国科学院声学研究所 | Device and method for active ultrasonic detection of fluid cavitation |
| CN102095796A (en) * | 2010-11-12 | 2011-06-15 | 中国科学院声学研究所 | Device and method for detecting fluid cavitation by combining active ultrasonic with passive acoustics |
| CN105181793A (en) * | 2015-05-14 | 2015-12-23 | 中国人民解放军国防科学技术大学 | Method for measurement of two-phase flow gas holdup based on ultrasonic two-frequency signal |
Non-Patent Citations (1)
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| 陈笑然 等: "基于主动超声的轴流水泵空化监测方法研究", 《工程设计学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111553373A (en) * | 2020-04-30 | 2020-08-18 | 上海理工大学 | CNN + SVM-based pressure bubble image recognition algorithm |
| CN111553373B (en) * | 2020-04-30 | 2023-04-07 | 上海理工大学 | CNN + SVM-based pressure bubble image recognition algorithm |
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Application publication date: 20170728 |