CN104914166A - Method and device for detecting and identifying deep sea cliff by using driven sonar - Google Patents
Method and device for detecting and identifying deep sea cliff by using driven sonar Download PDFInfo
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- CN104914166A CN104914166A CN201510296966.9A CN201510296966A CN104914166A CN 104914166 A CN104914166 A CN 104914166A CN 201510296966 A CN201510296966 A CN 201510296966A CN 104914166 A CN104914166 A CN 104914166A
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Abstract
The invention provides a detection method for the density change of seawater, which is used for detecting and identifying a deep sea cliff. The detection method comprises the following steps: firstly, putting a detector into the seawater, and collecting and generating an environment noise graph; secondly, carrying out sound spectrum analysis on a noise signal which is collected in real time so as to generate a real-time noise graph, and comparing the real-time noise graph with the environment noise graph; finally, judging whether the real-time noise graph and the environment noise graph have fluctuation or not; and when the fluctuation is generated and the fluctuation moves towards the low frequency, sending out alarming information. An imaging method can adopt a driven signal receiving manner (such as a driven sonar hydrophone), and no signal needs to be emitted, so that the elusiveness requirements are met when a submarine sails under the water.
Description
Technical field
The present invention relates to a kind of method of detecting liquid variable density, particularly relate to a kind of to the variable density of the deep sea water method detected and the device implementing the method, and it is in the detection of the deep-sea cliff of displacement and the application in preventing.
Background technology
There is the phenomenon of seawater spring layer in the large midocean in deep-sea, also claims thermal barrier, refers to that in seawater, the water layer of sudden change or discontinuous drastic change appears in some hydrographic features in vertical direction, shows levels seawater different in kind.Seawater spring layer mainly contains 4 kinds, i.e. epilimnion, halocline, pycnocline and transition layer of sound velozity.
The object of movement is if: submarine is once run into thermal barrier in the seawater, then can occur at short notice falling.Have and report: China's No. 372 submarines not long ago encountered hundreds of meters " fall dark " of once falling within a few minutes.Utilize fluid mechanics knowledge guestimate, cause this intensity " fall dark " if caused by the salinity of seawater, temperature variation, then the water temperature of this water body needs higher than the seawater of surrounding more than 10 DEG C, or salinity is low by more than 3 ‰.
Still can detect thermal barrier without any technology at present.
Summary of the invention
One object of the present invention is the detection method providing a kind of density of sea water to change, to realize the detection to detection seawater spring layer phenomenon.
Another object of the present invention is to provide a kind of device detecting density of sea water change, to implement the detection to detection seawater spring layer phenomenon.
Another object of the present invention is the detection method providing a kind of density of sea water to change, the application in the detection of the deep-sea cliff of displacement and early warning.
Another object of the present invention is to provide a kind of device detecting density of sea water change, with the application in the detection of the deep-sea cliff of displacement and early warning.
The detection method of a kind of density of sea water change provided by the invention, comprises the steps:
First, detector (as: sonar nautical receiving set) is placed in seawater, collects and produce neighbourhood noise spectrogram;
Then, the noise signal of real-time collecting is carried out voice print analysis, produce real-time noise spectrogram, and compare with neighbourhood noise spectrogram;
Finally, judge whether real-time noise spectrogram and neighbourhood noise spectrogram produce fluctuation, when fluctuation produces, and when fluctuating towards low frequency movement, then send information warning.
Method provided by the invention, can be applicable to because the material (as: methane) in seawater undergoes phase transition and produces the detection of the phenomenon of seawater spring layer, sending information warning in time, carry out early warning to the potential deep-sea cliff of displacement.
The sniffer of a kind of density of sea water change provided by the invention, comprises
Sonar nautical receiving set, to receive the signal in seawater;
Signal processing system, is connected with sonar nautical receiving set, receives the signal of sonar nautical receiving set, row relax of going forward side by side;
Processing workstation, comprises real-time noise voice print analysis module and discrimination module;
Real-time noise voice print analysis module, receives the signal of sonar nautical receiving set, carries out voice print analysis to the noise signal of real-time collecting;
Whether discrimination module, receives real-time noise voice print analysis module carries out voice print analysis result to noise signal, and judge towards the noise fluctuations of low frequency movement existing, and provides information warning; And
Display, is connected with processing workstation.
Device provided by the invention, can be applicable to implement to produce the detection of the phenomenon of seawater spring layer because the material (as: methane) in seawater undergoes phase transition, sends information warning in time, carry out early warning to the potential deep-sea cliff of displacement.
The beneficial effect that technical solution of the present invention realizes:
The detection method of density of sea water change of the present invention, can adopt passive acknowledge(ment) signal mode (as: passive sonar nautical receiving set), need not launch any signal, meet disguised requirement during submarine underwater navigation.
The sniffer of density of sea water change of the present invention can utilize original passive sonar system on submarine, and need not do transformation and the installation of any equipment to submarine, is convenient to application.
Accompanying drawing explanation
Fig. 1 is the variation relation figure of states of matter with temperature, pressure of methane in mixing water body;
The schematic diagram that Fig. 2 is formed for " the deep-sea cliff of displacement ";
Fig. 3 is Gaussian distribution schematic diagram;
Fig. 4 superposes the noise spectrum figure produced, and in figure, dashed rectangle indicates noise fluctuations, and moves to the low frequency range of arrow indication;
Fig. 5 is the schematic diagram of detection method one embodiment of density of sea water of the present invention change;
Fig. 6 is the schematic diagram of device one embodiment of the detection method implementing density of sea water of the present invention change.
Embodiment
Technical scheme of the present invention is described in detail below in conjunction with accompanying drawing.The embodiment of the present invention is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to the technical scheme of invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in right of the present invention.
Water-gas mixture forms the checking of " the deep-sea cliff of displacement " mechanism:
The degree of depth of large midocean seawater is thousands of rice, and the Thickness Ratio land of the seabed earth's crust is much thin, and the mixed-burned gas liquefaction of storage in the earth's crust can in this weak location ejection.Marine Geology scholar found this ejecta in location, many places, deep-sea, and this ejecta more than 90% is methane (CH
4).In the low temperature, hyperbaric environment in seabed, methane is in a liquid state shape, and proportion is 0.42 ~ 0.46 gram every cubic centimetre, more much lower than the seawater of surrounding, and therefore they can float.Be cemented in the combustible ice (CH in marine bottom sediment
48h
2o, proportion 0.9), once sub sea conditions change, may come off from sea bed and enter water body, and slowly float from seabed.Methane is a kind of extremely difficult material being dissolved in water, and its solubleness in water is 3.3 milligrams/100 grams (1 standard atmospheric pressure, 20 degrees Celsius), close with the solubleness of oxygen in water.
Therefore enter methane in the water body of seabed seldom by seawater solution absorption, extreme portions can spread and be mixed in seawater, forms methane-sea water mixing thing water body.This water body is under the effect of buoyancy, horizontal ocean current, and drift of constantly floating, and methane is also constantly diluted, the water body volume containing methane constantly increases.Mixing water body in methane states of matter with temperature, pressure variation relation Fig. 1 shown in.
As seen from Figure 1, determine temperature to certain, there is critical pressure, when pressure is higher than this critical pressure, methane is in a liquid state, and is gaseous state lower than methane during critical pressure.Along with the rising of temperature, critical pressure also raises.This figure and ocean temperature Profile Correlation can be obtained the size that this sea area, section place methane states of matter changes critical pressure, the corresponding critical depth that can obtain correspondence.Be greater than this degree of depth, the methane in seawater is in a liquid state, and is less than this degree of depth, and the methane in seawater is gaseous state, and the methane now in water can form a large amount of bubble, when volume ratio is liquid hundreds of times greatly, thus makes seawater average density significantly reduce formation " cliff of displacement ", see Fig. 2.In addition, seabed also deposits a large amount of combustible ice (CH
48H
2o), after it comes off from sea bed, its density is less than density of sea water and floats, and also can undergo phase transition along with floating, and forms a large amount of bubble.Thus, seawater average density is made significantly to reduce formation " cliff of displacement ".
According to the analysis to China's South Sea hydrologic data, the critical depth of the methane solution-air transformation at the South Sea is between 200 ~ 300 meters, and namely " the deep-sea cliff of displacement " at the South Sea should produce on the degree of depth of 200 ~ 300 meters.
The average density of solution-airmixture water body is such as formula shown in (1)
In formula
for the average density of water body, M
firstfor the gross mass of methane in water body, M
waterseawater gross mass in water body, V
firstmethane volumetric in water body, V
waterseawater bulk in water body.
Because " the deep-sea cliff of displacement " is all occur on critical depth, the methane in water is gaseous state.The volume of methane changes with temperature, pressure difference.1 kilograms of methane is in different pressure (unit: standard atmospheric pressure), and the volume of different temperatures (unit: degree Celsius) is such as formula shown in (2)
Bring formula (2) into formula (1), obtain formula (3)
Formula can illustrate different temperatures, the degree of depth thus, the average density of water body during different methane content.Estimate that the methane solution-air conversion critical degree of depth at the South Sea is between 200 ~ 300 meters according to South Sea hydrologic data, should on this degree of depth if there is " the deep-sea cliff of displacement ".Now calculate 100 meters under water, water temperature 20 DEG C, density of sea water 1.0225Kg/L, the average density of water body during different methane content, and the buoyancy loss amount of the submarine of 3000 tons of water discharge in this water body, as shown in table 1 below:
Table 1
From upper table 1, methane is mixed into very large on density of sea water impact in seawater, only account for the methane of seawer quality 0.02% in the seawater, the density of this water body just can be made to be less than 1 gram every cubic centimetre, if at seabed ejection about 7800 tons of methane, just can form diameter 1 km, height 100 meters of cylindrical water bodies, methane content is 1/10000.3000 tons of water discharge submarines sail into wherein, and buoyancy loses 40 tons, thus fall dark subsidence accident.
" the deep-sea cliff of displacement " be one floating on critical depth containing methane water body, the methane in water body is gaseous state by liquid conversion, and generate many minute bubbles, vibrated sends noise.
The feature of this noise spectrum is distributed by the diameter of bubble a large amount of in bubble population and determined.In general, in bubble population, bubble diameter is the distribution of Gaussian function type, and corresponding noise spectrum level also should be Gaussian structure, as shown in Figure 3.Due to bubble upwards float time, pressure reduces gradually, bubble average external volume increase, corresponding vibration frequency reduces gradually, and thus this Gaussian spectrum level is along with the prolongation of time, moves to low frequency direction.At deep-sea place, this bubble noise superposition and on deep-marine-environment noise, produce noise spectrum figure as shown in Figure 4, and along with the increase of time, the Gaussian envelope projection on noise spectrum figure is passed to low-frequency range gradually.
Fig. 5 is the schematic diagram of detection method one embodiment of density of sea water of the present invention change, as figure 5 illustrates, comprises the steps:
Step 100, is placed in seawater by detector (as: sonar nautical receiving set), collects and produce neighbourhood noise spectrogram;
Step 200, carries out voice print analysis by the noise signal of real-time collecting, produces real-time noise spectrogram, and compares with neighbourhood noise spectrogram;
Step 300, judges whether real-time noise spectrogram and neighbourhood noise spectrogram produce fluctuation, comprise
When judgement fluctuation produces, and when fluctuating towards low frequency movement, then carry out step 310, send information warning;
When judgement does not produce fluctuation, then carry out step 200 and continue and compare with neighbourhood noise spectrogram.
Fig. 6 is the schematic diagram of device one embodiment of the detection method implementing density of sea water of the present invention change, as indicated with 6, comprises sonar nautical receiving set 20, and to receive the signal in seawater, the present embodiment adopts passive sonar nautical receiving set.
Signal processing system 10 is connected with sonar nautical receiving set 20, receives the signal of passive sonar nautical receiving set, processes and judge whether front exists barrier or target.
Real-time noise voice print analysis module 30 receives the signal of sonar nautical receiving set 20, carries out voice print analysis, and send discrimination module 40 to the noise signal of real-time collecting.Discrimination module 40 judges received noise signal voice print analysis result, and when existing towards the noise fluctuations of low frequency movement, provides information warning.
Real-time noise voice print analysis module 30 and discrimination module 40 are placed in processing workstation 50, and display 60 is connected with processing workstation 50, and show the analysis chart picture of real-time noise voice print analysis module 30 in real time, and the information warning of discrimination module 40.
The device that the present embodiment provides, signal processing system 10 and sonar nautical receiving set 20 all can utilize original passive sonar system on submarine, namely need not do transformation and the installation of any equipment to submarine, are convenient to application.
Claims (7)
1. a detection method for density of sea water change, is characterized in that comprising the steps:
First, detector is placed in seawater, collects and produce neighbourhood noise spectrogram;
Then, the noise signal of real-time collecting is carried out voice print analysis, produce real-time noise spectrogram, and compare with neighbourhood noise spectrogram;
Finally, judge whether real-time noise spectrogram and neighbourhood noise spectrogram produce fluctuation, when fluctuation produces, and when fluctuating towards low frequency movement, then send information warning.
2. the detection method of density of sea water change according to claim 1, is characterized in that described sonar nautical receiving set is passive sonar nautical receiving set.
3. the application of the detection method of density of sea water change according to claim 1 in the phenomenon of detection seawater spring layer.
4. the application of detection method in the cliff of displacement of early warning deep-sea of density of sea water change according to claim 1.
5. a device for the detection method changed for density of sea water according to claim 1, is characterized in that comprising
Sonar nautical receiving set, to receive the signal in seawater;
Signal processing system, is connected with described sonar nautical receiving set, the signal of the sonar nautical receiving set described in reception, row relax of going forward side by side;
Processing workstation, comprises real-time noise voice print analysis module and discrimination module;
Display, is connected with described processing workstation;
Described real-time noise voice print analysis module, the signal of the sonar nautical receiving set described in reception, carries out voice print analysis to the noise signal of real-time collecting;
Described discrimination module, whether the real-time noise voice print analysis module described in reception carries out the result of voice print analysis to noise signal, and judge towards the noise fluctuations of low frequency movement existing, and provides information warning.
6. the application of device according to claim 5 in the phenomenon of detection seawater spring layer.
7. the application of device according to claim 1 in the cliff of displacement of early warning deep-sea.
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| CN107607438A (en) * | 2017-08-08 | 2018-01-19 | 南京中探海洋物联网有限公司 | A kind of density of sea water measuring method in a wide range of marine site |
| CN109375198A (en) * | 2018-12-10 | 2019-02-22 | 哈尔滨工程大学 | A kind of low frequency sonar battle array impedance operator calibration method |
| TWI773893B (en) * | 2018-06-07 | 2022-08-11 | 德商英諾吉歐洲股份公司 | Method, apparatus and system for arrangement of wind turbines, and computer program comprising program instructions associated therewith |
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| CN109375198A (en) * | 2018-12-10 | 2019-02-22 | 哈尔滨工程大学 | A kind of low frequency sonar battle array impedance operator calibration method |
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