CN1834618A - Air corrosion monitoring system of area distributing drainage building - Google Patents
Air corrosion monitoring system of area distributing drainage building Download PDFInfo
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- CN1834618A CN1834618A CN 200610013475 CN200610013475A CN1834618A CN 1834618 A CN1834618 A CN 1834618A CN 200610013475 CN200610013475 CN 200610013475 CN 200610013475 A CN200610013475 A CN 200610013475A CN 1834618 A CN1834618 A CN 1834618A
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Abstract
This invention discloses a area distributed drain building cavity erosion detecting system. The system is made up by sensor, transmission cable, analysis system, early warning and alarm system. One fiber optic sensor is reticular laid on two cross section of building surface, two fiber optic sensors are connected to fiber vibration survey meter through optical cable, the meter transfers the vibration signal to signal processing and analysis module, and the module decomposes the signal into high frequency component and low frequency component, and output corresponding self power spectrum and cross correlation spectrum, the high frequency signal is sent to cavitation early warning system, the low frequency signal is sent to cavity erosion grade alarm system. The detecting range is wide, diagnose accuracy rate is high, durability is good, regional synchronous cavitation cavity erosion detecting can be realized. The forward end of fiber optic network is passive, all supplying equipments and detecting equipments are in control room in distant, execution and running is convenient.
Description
[technical field]
The present invention relates to the sluicing building structure automatic monitoring technical field in the Hydraulic and Hydro-Power Engineering, particularly a kind of air corrosion monitoring system of area distributing drainage building.
[background technology]
At present, the destruction of the outlet structure escape works in Hydraulic and Hydro-Power Engineering example is a lot.Cavitation erosion occupies suitable proportion therein.Yet, people mainly concentrate on the hydraulics such as the hydraulic turbine, water pump the monitoring of cavitation and cavitation erosion, and have formed corresponding techniques and product, as measuring flow passage components pressure, pressure pulsation, vibration, noise, the abrasion of perhaps monitoring blade damages degradation under the turbine efficiency.Up to now, people to the concern of outlet structure escape works cavitation cavity erosion detecting not enough, also lacking proven technique and product can use.There is following difference in the cavitation and cavitation erosion feature of hydraulics such as the cavitation and cavitation erosion of outlet structure escape works and the hydraulic turbine: the flow velocity height of (1) outlet structure escape works, and damage capability is strong; (2) outlet structure escape works may produce cavitation erosion regional wide, uncertain factor is many; (3) outlet structure escape works are concrete material, and cavitation erosion is fast-growth, consequence is even more serious.At present, mostly the cavitation cavity erosion detecting instrument that adopts on the hydraulics such as the hydraulic turbine is " point " formula sensor, mainly is the generation of monitoring cavitation and cavitation erosion by test pressure pulsation, vibration or noise.The cavitation corrosion monitoring instrument of hydraulic is used for the flood releasing structure cavitation corrosion monitoring has following problem and defective: (1) outlet structure escape works may produce the regional wide of cavitation erosion, " point " formula sensor exists monitoring range big inadequately, is easy to generate the phenomenon of " test leakage "; (2) the flow velocity height of outlet structure escape works, it is just relatively large that cavitation corrosion vibration and noise before do not take place, and " signal to noise ratio (S/N ratio) " of cavitation corrosion monitoring is less relatively, and " point " formula sensor is easy to generate the phenomenon of " mistaken diagnosis "; (3) these " point " formula sensors bear the effect of high-velocity flow for a long time, and instrument lost efficacy easily.
[summary of the invention]
Purpose of the present invention is intended to overcome the defective of prior art, and a kind of air corrosion monitoring system of area distributing drainage building is provided, and this structure has that monitoring range is wide, accuracy rate of diagnosis is high, good endurance, easy construction, the characteristics that construction costs is low.
The present invention be address the above problem the scheme that is adopted be the design a kind of air corrosion monitoring system of area distributing drainage building.This system comprises sensor, transmission cable, analytic system and early warning, warning system, it is characterized in that along 3～6cm place under the outlet structure escape works surface in monitoring and protecting zone, from water (flow) direction upstream one end to the downstream one end, on whole cross section, be Fibre Optical Sensor of netted laying, and under this cross section second section at 15～30cm place, be another root Fibre Optical Sensor of identical shaped staggered laying with the aforementioned lights fiber sensor; The terminal of said two Fibre Optical Sensors is connected to termination box by optical cable, top is connected on the fiber-optic vibration detection instrument apart from optical cable by optical cable connecting box and length, the fiber-optic vibration detection instrument passes to signal Processing and analysis module with vibration signal, this module is passed through signal Processing and analysis, it is high fdrequency component and low frequency component that vibration signal is decomposed, and export corresponding auto-power spectrum and coherence spectra, and high-frequency signal is sent to the cavitation early warning system, and low frequency signal is sent to the cavitation level warning system.
Superiority of the present invention is: this system has that monitoring range is wide, accuracy rate of diagnosis is high, the characteristics of good endurance, and the advantage of regional synchronous cavitation cavity erosion detecting, violent cavity group cavitation and cavitation corrosion take place for any point in the fiber optic network layout area peels off the Shi Douhui that comes off and is monitored to and reports to the police.And the fiber optic network front end is fully passive, and just all power-supply units and monitoring equipment all are in the pulpit several kilometers outside, connects by an optical cable get final product, constructs and operational management makes things convenient for.
[description of drawings]
Fig. 1 is an one-piece construction synoptic diagram of the present invention;
Fig. 2 is an area light fiber sensor floor plan synoptic diagram to be measured of the present invention.
Among the figure: 1 is outlet structure escape works monitoring and protecting zone, and 2 is upper strata fiber distribution vibration transducer, and 3 is lower floor's fiber distribution vibration transducer; 4 is the high-velocity flow and the flow direction thereof; 5 is optical cable connecting box, and 6 is termination box, and 7 is long apart from optical cable; 8 is the fiber-optic vibration detection instrument; 9 is signal Processing and analysis module, and 10 is high frequency component signal, and 11 is low-frequency signal components; 12 is cavitation group early warning system, and 13 is the cavitation level warning system.
[embodiment]
Air corrosion monitoring system of area distributing drainage building of the present invention is determined the key area that cavitation cavity erosion detecting is protected according to the grade and the water flow inside fluidised form of outlet structure escape works.This zone comprises along the surface range of outlet structure escape works and vertical degree of depth.When outlet structure escape works are constructed the appointment aspect, be generally apart from it and cross water surface 15～30cm, Fibre Optical Sensor is the wave curve along water (flow) direction on this plane (or cambered surface), or the cloud deltoid, continuously reticulate texture curves such as figure of eight curve are laid on this aspect, and receive respectively in separately the optical cable connecting box two terminations of optical fiber.Another monitoring aspect then continues to construct, be generally apart from outlet structure escape works surface 3～6cm, according to identical reticulate texture paving mode with Fibre Optical Sensor with respect to following one deck staggered be laid on this layer, the fibre-optical splice at two ends inserts respectively in the optical cable connecting box of preceding one deck.Finish the construction of whole outlet structure escape works at last.
Fibre Optical Sensor used in the present invention is the fiber distribution vibration transducer, but employed optical cable is an optical fiber cable for direct burial, as armouring optical cable etc.The terminal of two Fibre Optical Sensors is connected to termination box by optical cable, and top is connected on the fiber-optic vibration detection instrument apart from optical cable by long.
The fiber-optic vibration detection instrument connects broad band amplifier by photoelectric commutator and forms, and photoelectric commutator is converted into electric signal with the vibration signal that carries on the light signal by photoelectric commutator, then by the broad band amplifier amplification and export to signal Processing and analysis module.
Signal Processing and analysis module are made up of bandpass filter and spectrum transformation device.Bandpass filter can be digital filter (for example Chebyshev filter, sef-adapting filter etc.) or analog filter, also can be the virtual filtered device.The spectrum transformation device can be with other analytical approachs such as Fourier transform or fast Fouriers, perhaps Usage data collection card and virtual digit filtering technique, for example labview software etc.Its function is that the frequency spectrum of signal, auto-power spectrum, coherence spectra, maximum spectral power component and other information or the like are exported by high fdrequency component and two parts of low frequency component, exports to cavitation group early warning system and cavitation level warning system respectively.High-frequency signal is sent to the cavitation early warning system, is used for judging the zone whether outlet structure escape works cavitation take place and cavitation takes place; Low frequency signal is sent to the cavitation level warning system, is used for judging the degree of outlet structure escape works cavitation corrosion.
The main early warning way of cavitation group's early warning system is that the high-frequency signal of upper strata Fibre Optical Sensor is analyzed identification.When the high fdrequency component phenomenal growth, low frequency component changes little, and the vibration signal of lower floor's Fibre Optical Sensor changes when little, illustrates that again some position has produced the cavity group.
The cavitation level warning system is to estimate the degree of depth of cavitation corrosion by the relation of analyzing some characteristic frequency spectrum in two aspects.When cavitation corrosion is peeled off when being shed to upper strata optical fibre vibration sensor layer, this layer Fibre Optical Sensor meeting high vibration, at this moment vibration will be based on low frequency (10KHz be following), and the high-frequency signal phenomenal growth of lower floor's Fibre Optical Sensor is so just warned our the cavitation corrosion degree of peeling off and has been reached certain set depth.When cavitation erosion continued development, the upper strata Fibre Optical Sensor may be because be destroyed by rush of water and loss signal, and lower floor's Fibre Optical Sensor can repeat top process.
Because cavitation erosion all has distribution on 0～100kHz, and obviously increase more than 30kHz, the frequency of maximum sound radiation intensity generally all is lower than 400kHz, so cavitation noise mainly shows as high frequency component signal (more than the 30KHz).When the outlet structure escape works operate as normal, the vibration signal of two-layer optical fiber on each frequency range all a little less than.When some position of outlet structure escape works begins cavitation and cavitation erosion takes place, the high frequency component signal phenomenal growth of the upper strata Fibre Optical Sensor of corresponding site, low frequency component changes little, and the vibration signal of lower floor's Fibre Optical Sensor changes not quite, because the high frequency cavitation decays very soon, can estimate the degree of depth of cavitation corrosion by the relation of analyzing some characteristic frequency spectrum in two aspects.When cavitation corrosion is peeled off when being shed to upper strata optical fibre vibration sensor layer, this layer Fibre Optical Sensor meeting high vibration, at this moment vibration will be based on low frequency (10KHz be following), and the high-frequency signal phenomenal growth of lower floor's Fibre Optical Sensor is so just warned our the cavitation corrosion degree of peeling off and has been reached certain set depth.When cavitation erosion continued development, the upper strata Fibre Optical Sensor may be because be destroyed by rush of water and loss signal, and lower floor's Fibre Optical Sensor can repeat top process.
One embodiment of the invention is as follows: a kind of fiber area distribution cavitation cavity erosion detecting guard system as depicted in figs. 1 and 2, it is made up of fiber distribution vibration transducer, optical cable connecting box 5, termination box 6, optical cable 7, fiber-optic vibration detection instrument 8, signal processing analysis module 9, cavitation group's early warning system 12 and cavitation level warning system 13.The fiber distribution vibration transducer is generally two-layer layout, and Fibre Optical Sensor 2 aspects in upper strata are apart from outlet structure escape works surface 3～6cm, and undulate distributes in the plane, is routed to the downstream other end from current 4 upstreams one end in monitoring and protecting zone 1; Lower floor's Fibre Optical Sensor 3 aspects are the waveform distribution staggered with the upper strata Fibre Optical Sensor in the plane apart from outlet structure escape works surface 15～30cm, and also the end from the monitoring and protecting zone is routed to the other end; Two terminations of Fibre Optical Sensor are linked into respectively in the optical cable connecting box, and its terminal is connected to termination box by optical cable, and top is connected on the fiber-optic vibration detection instrument apart from optical cable by long; The fiber-optic vibration detection instrument passes to signal Processing and analysis module with vibration signal, and this module is high fdrequency component 10 and low frequency component 11 with the vibration signal decomposition, and exports its corresponding auto-power spectrum and coherence spectra by to signal Processing and analysis; High-frequency signal is sent to the cavitation early warning system and is used for judging the zone whether outlet structure escape works cavitation take place and cavitation takes place; Low frequency signal is sent to the degree that the cavitation level warning system is used for judging the outlet structure escape works cavitation corrosion.The fiber area distribution cavitation cavity erosion detecting safeguard structure of Gou Chenging like this, monitoring range is wide, accuracy rate of diagnosis is high, good endurance, and a situation arises and destructiveness can to monitor cavitation and cavitation erosion again simultaneously, classifying alarm.
Claims (8)
1 one kinds of air corrosion monitoring system of area distributing drainage building, comprise sensor, transmission cable, analytic system and early warning, warning system, it is characterized in that along 3～6cm place under the outlet structure escape works surface in monitoring and protecting zone, from water (flow) direction upstream one end to the downstream one end, on whole cross section, be Fibre Optical Sensor of netted laying, and under this cross section second section at 15～30cm place, be another root Fibre Optical Sensor of identical shaped staggered laying with the aforementioned lights fiber sensor; The terminal of said two Fibre Optical Sensors is connected to termination box by optical cable, top is connected on the fiber-optic vibration detection instrument apart from optical cable by optical cable connecting box and length, the fiber-optic vibration detection instrument passes to signal Processing and analysis module with vibration signal, this module is passed through signal Processing and analysis, it is high fdrequency component and low frequency component that vibration signal is decomposed, and export corresponding auto-power spectrum and coherence spectra, and high-frequency signal is sent to the cavitation early warning system, and low frequency signal is sent to the cavitation level warning system.
2 according to the described air corrosion monitoring system of area distributing drainage building of claim 1, it is characterized in that said Fibre Optical Sensor is the wave curve and lays.
3 according to claim 1 or 2 described air corrosion monitoring system of area distributing drainage building, it is characterized in that said Fibre Optical Sensor is the fiber distribution vibration transducer.
4 according to the described air corrosion monitoring system of area distributing drainage building of claim 1, but it is characterized in that said optical cable is an optical fiber cable for direct burial.
5 according to claim 1 or 2,4 described air corrosion monitoring system of area distributing drainage building, it is characterized in that said fiber-optic vibration detection instrument connects broad band amplifier by photoelectric commutator and forms, photoelectric commutator is converted into electric signal with the vibration signal that carries on the light signal by photoelectric commutator, amplifies by broad band amplifier then and exports to signal Processing and analysis module.
6 according to the described air corrosion monitoring system of area distributing drainage building of claim 3, it is characterized in that said fiber-optic vibration detection instrument connects broad band amplifier by photoelectric commutator and forms, photoelectric commutator is converted into electric signal with the vibration signal that carries on the light signal by photoelectric commutator, amplifies by broad band amplifier then and exports to signal Processing and analysis module.
7 according to claim 1 or 2,4,6 described air corrosion monitoring system of area distributing drainage building, it is characterized in that said signal Processing and analysis module be made up of bandpass filter and spectrum transformation device, it presses two part outputs of high and low frequency with frequency spectrum, auto-power spectrum, coherence spectra, the maximum spectral power component information of signal, exports to cavitation group early warning system and cavitation level warning system respectively.
8 according to the described air corrosion monitoring system of area distributing drainage building of claim 5, it is characterized in that said signal Processing and analysis module be made up of bandpass filter and spectrum transformation device, it presses two part outputs of high and low frequency with frequency spectrum, auto-power spectrum, coherence spectra, the maximum spectral power component information of signal, exports to cavitation group early warning system and cavitation level warning system respectively.
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| CNB200610013475XA CN100371699C (en) | 2006-04-19 | 2006-04-19 | Air corrosion monitoring system of area distributing drainage building |
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| CNB200610013475XA CN100371699C (en) | 2006-04-19 | 2006-04-19 | Air corrosion monitoring system of area distributing drainage building |
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| CN1834618A true CN1834618A (en) | 2006-09-20 |
| CN100371699C CN100371699C (en) | 2008-02-27 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018062A (en) * | 2012-11-26 | 2013-04-03 | 中国农业大学 | Monitoring device and monitoring and judging method for cavitation of venturi fertilizer injector |
| CN112432694A (en) * | 2020-11-06 | 2021-03-02 | 中冶建筑研究总院有限公司 | Industrial plant power monitoring method based on distributed optical fiber sensor |
| CN113916978A (en) * | 2021-08-26 | 2022-01-11 | 华能澜沧江水电股份有限公司 | Real-time monitoring method and system for cavitation of hydraulic tunnel during operation period based on audio |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN85104819B (en) * | 1985-06-19 | 1987-09-09 | 西安公路研究所 | Acousto electric effect method and its equipment for undamage testing the quality of pile |
| CN1127356A (en) * | 1995-01-20 | 1996-07-24 | 电子科技大学 | Optic fibre vibration sensor |
| JP3415825B2 (en) * | 2000-08-18 | 2003-06-09 | ショーボンド建設株式会社 | A planar strain sensor for checking the progress of damage to a concrete structure and a method for checking the progress of damage to a concrete structure. |
| JP2003065942A (en) * | 2001-08-23 | 2003-03-05 | Mitsubishi Heavy Ind Ltd | Device and method for diagnosing damaged degree of concrete |
| CN1164886C (en) * | 2002-12-10 | 2004-09-01 | 西安交通大学 | Oil gas pipeline leak intelligent on line monitoring method based on distribution type optical fibre sensor |
| US20050082467A1 (en) * | 2003-10-21 | 2005-04-21 | Guy Mossman | Optical fiber based sensor system suitable for monitoring remote aqueous infiltration |
| CN1276237C (en) * | 2004-09-15 | 2006-09-20 | 南京大学 | Rating method and instrument for distributing type optical fiber strain sensor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018062A (en) * | 2012-11-26 | 2013-04-03 | 中国农业大学 | Monitoring device and monitoring and judging method for cavitation of venturi fertilizer injector |
| CN103018062B (en) * | 2012-11-26 | 2014-12-31 | 中国农业大学 | Monitoring device and monitoring and judging method for cavitation of venturi fertilizer injector |
| CN112432694A (en) * | 2020-11-06 | 2021-03-02 | 中冶建筑研究总院有限公司 | Industrial plant power monitoring method based on distributed optical fiber sensor |
| CN112432694B (en) * | 2020-11-06 | 2021-11-02 | 中冶建筑研究总院有限公司 | Industrial plant power monitoring method based on distributed optical fiber sensor |
| CN113916978A (en) * | 2021-08-26 | 2022-01-11 | 华能澜沧江水电股份有限公司 | Real-time monitoring method and system for cavitation of hydraulic tunnel during operation period based on audio |
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| CN100371699C (en) | 2008-02-27 |
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