CN103200519B - Fire source positioning system of tank farm and fire source positioning method thereof - Google Patents
Fire source positioning system of tank farm and fire source positioning method thereof Download PDFInfo
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- CN103200519B CN103200519B CN201310059038.1A CN201310059038A CN103200519B CN 103200519 B CN103200519 B CN 103200519B CN 201310059038 A CN201310059038 A CN 201310059038A CN 103200519 B CN103200519 B CN 103200519B
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- fire
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Abstract
The invention discloses a fire source positioning system of a tank farm and a fire source positioning method of the tank farm. The fire source positioning system of the tank farm comprises a wireless sensor network, a calculation unit and a displayer, wherein the wireless sensor network is connected with the calculation unit through wireless signals, and the calculation unit is connected with the displayer in a signal mode. The fire source positioning method of the tank farm comprises the following steps: building a network model of the tank farm; building a model of flame spread; obtaining fire source positioning information of the tank farm; and inverting the fire source positioning position and the outputting fire source position. The fire source positioning system of the tank farm and the fire source positioning method of the tank far can rapidly and accurately position the fire source of the tank farm.
Description
Technical field
The invention belongs to burning things which may cause a fire disaster field of locating technology, particularly a kind of can fast, accurately, locate tank farm burning things which may cause a fire disaster navigation system and the tank farm burning things which may cause a fire disaster localization method of tank farm burning things which may cause a fire disaster safely.
Background technology
At present, burning things which may cause a fire disaster location mainly concentrates on the spontaneous combustion burning things which may cause a fire disaster Detection location of coal industry.The method of spontaneous combustionof coal fire source probing location mainly contains: discrete regularization method method, infrared detecting method etc.
The position problem identificatioin of underground coal mine concealed fire is summarized as source of the seeking indirect problem of the equation of heat conduction by Tian Yu etc., using the thermo parameters method of surveying around burning things which may cause a fire disaster as additional conditions, utilize Discrete Regularization Method to solve the equation of heat conduction, have studied coal road closely fire location problem identificatioin theoretically.Wang Zhen equality, according to the distribution of infrared acquisition energy field, is set up the equation of heat conduction of coal road spontaneous combustion of coal seam high temperature dot, is proposed the inversion algorithm of coal road contiguous seams spontaneous combustion high temperature dot, determine the degree of depth of spontaneous combustion burning things which may cause a fire disaster, scope and temperature.
But, above method and be not suitable for tank farm burning things which may cause a fire disaster location.
Discrete Regularization Method carries out inverting to concealed fire, and two-dimensional temperature field is reduced to one-dimension temperature field, better from practical application effect, but the method is carried out on the basis that the known equation of heat conduction resolves solution, which has limited its range of application.Coal road space structure is comparatively fixing, the influencing factor that heat transfer is subject to is less, and tank farm multidigit is under open open-air atmosphere, the disturbing factor that heat transfer is subject to is many and uncontrollable, carries out theory analysis comparatively complicated from the angle of the equation of heat conduction to tank farm burning things which may cause a fire disaster heat transfer.
Infrared detecting method close-in measurement effect is better.Chinese invention patent " the infrared acquisition method of coal road spontaneous combustionof coal fire source location " (application number: 99120455.7, publication date: 2001.7.4) after the coal road digging determining to detect, point layout and infrared acquisition are carried out to whole coal road by (1), (2) find out coal road concealed fire temperature anomaly section, (3) are carried out inverting to heat transfer equation and are resolved and determine shielding fire source location.But the scope of tank farm is often comparatively large, and detection range excessively far away can affect detection accuracy and accuracy.In infrared detecting method, in order to accurate positioning, often need artificially to increase sensing point in detection process, this is both consuming time also dangerous; In addition, actual observation be the infrared intensity of tunnel wall, and feature physical quantity similar in tank farm is available.
Therefore, prior art Problems existing is: quick, accurate, the safe burning things which may cause a fire disaster navigation system and the burning things which may cause a fire disaster localization method that are not still applicable to burning things which may cause a fire disaster location, tank farm.
Summary of the invention
The object of the present invention is to provide a kind of tank farm burning things which may cause a fire disaster navigation system, it can realize the burning things which may cause a fire disaster location of tank farm quickly and accurately.
Another object of the present invention is to provide one tank farm burning things which may cause a fire disaster localization method fast and accurately.
The technical solution realizing the object of the invention is: a kind of tank farm burning things which may cause a fire disaster navigation system, it comprises wireless sensor network, computing unit and display, wireless sensor network is connected by wireless signal with computing unit, computing unit is connected with monitor signal, described wireless sensor network is used for Real-time Collection tank farm burning things which may cause a fire disaster locating information, and by radioing to computing unit, described computing unit is used for setting up tank farm network model, set up spread process model, tank farm burning things which may cause a fire disaster locating information is obtained from wireless sensor network, inverting locating fire source position and export fire location information to display, described display is used for display translation fire location information.
The technical solution realizing another object of the present invention is: a kind of tank farm burning things which may cause a fire disaster localization method, it comprises: set up tank farm network model, sets up spread process model, obtains tank farm burning things which may cause a fire disaster locating information, inverting locating fire source position, exports the steps such as fire location.
The present invention compared with prior art, its remarkable advantage:
1, accurate: for tank farm circumstance complication with uncontrollable factor is many etc. that model that feature sets up is applicable to most of actual conditions;
2, quick: the burning things which may cause a fire disaster position fixing process occurred after the condition of a fire is completed by computing unit, and get involved without the need to personnel, locating periodically is shorter;
3, just can carry out burning things which may cause a fire disaster location by a part of observation information, add the robustness of system;
4, utilize wireless sensor network to monitor tank farm, to the strong adaptability of environment, can dispose flexibly according to actual conditions;
5, safety: in tank farm burning things which may cause a fire disaster navigation system and method, decrease the workload of personnel, has ensured the safety of personnel simultaneously.
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is tank farm of the present invention burning things which may cause a fire disaster positioning system structure block diagram.
Fig. 2 is tank farm of the present invention burning things which may cause a fire disaster localization method main flow chart.
Fig. 3 sets up tank farm network model flow chart in Fig. 2.
Fig. 4 sets up spread process model flow figure in Fig. 2.
Fig. 5 obtains tank farm burning things which may cause a fire disaster locating information flow chart in Fig. 2.
Fig. 6 is inverting locating fire source position flow chart in Fig. 2.
Fig. 7 is tank farm network topology structure schematic diagram.
Fig. 8 is tank farm fire location schematic diagram.
Fig. 9 is certain moment tank farm fire spread situation schematic diagram.
Figure 10 is for choosing observation station situation schematic diagram.
Figure 11 is burning things which may cause a fire disaster positioning result figure schematic diagram.
In figure, 1 wireless sensor network, 2 computing units, 3 displays.
Embodiment
As shown in Figure 1, tank farm of the present invention burning things which may cause a fire disaster navigation system, it comprises wireless sensor network 1, computing unit 2 and display 3, and described wireless sensor network 1 is connected by wireless signal with computing unit 2, and described computing unit 2 is connected with display 3 signal;
Described wireless sensor network 1 for Real-time Collection tank farm burning things which may cause a fire disaster locating information, and by radioing to computing unit 2;
Described computing unit 2 is for setting up tank farm network model, setting up spread process model, obtaining tank farm burning things which may cause a fire disaster locating information, inverting locating fire source position and export fire location information to display 3 from wireless sensor network 1;
Described display 3 is for display translation fire location information.
Described wireless sensor network 1 comprises at least 2 wireless sensers.
Computing unit 2 can be any existing computing equipment, as PC etc.
Wireless sensor network is arranged in oil tank region.Utilize wireless sensor network to monitor tank farm, to the strong adaptability of environment, can dispose flexibly according to actual conditions.
Fig. 2 is tank farm of the present invention burning things which may cause a fire disaster localization method main flow chart.
As shown in the figure, tank farm of the present invention burning things which may cause a fire disaster localization method comprises the steps:
10) tank farm network model is set up.
In a model, each oil tank is modeled as a network node.At any time, node state can only for following both one of: 1. catch fire, 2. not yet catch fire.The limit connecting two nodes represents the path of fire spread between these two oil tanks, and limit self does not have direction.Such as, limit ab represents the path of fire spread between node a and node b, and fire can spread to node b along limit ab from node a, and vice versa.Based on above process, tank farm is modeled as a limited non-directed graph G={V, E}.Wherein, V represents the set of network node in figure, and E represents the set on limit in figure.
Concrete steps as shown in Figure 3, for:
11) oil tank is modeled as network node, gathers for V;
12) fire spread path model is turned to limit, gather for E;
13) limited non-directed graph is set up, G={V, E};
14) tank farm network model is exported.
In actual applications, because tank farm information can be surveyed, so all nodes of non-directed graph figure G and the topological relation on limit are also known.
20) spread process model is set up.
First node states all in the network model of the tank farm set up are set to and not yet catch fire.When supposing to detect that the condition of a fire occurs certain node u, record current time t, and according to the monitoring situation of transducer to the limit of all connection u, judging fires from which direction (node) spreads to u, being designated as direction is d, and the state of node u is set to and catches fire.After sending the temporal information t of node number, record and directional information d to computing unit, continue to monitor tank farm and environment thereof.
This fire spread model can be used for the majority of case that may run in reality.
Concrete steps as shown in Figure 4, for:
21) initialization node state;
22) judge whether the new condition of a fire to be detected, if so, then carry out next step, no, then continue to detect;
23) current time is recorded; The source direction of record fire;
24) this node state is set to " catching fire ";
25) export the nodal information that catches fire, carry out the detection of the next round condition of a fire.
30) tank farm burning things which may cause a fire disaster locating information is obtained.
In a certain moment after the condition of a fire occurs, making all states this moment be the set that the node caught fire is formed is T, if the number of element is M in T.Because the state of burning things which may cause a fire disaster node is for catching fire, so it necessarily also belongs to set T.In set T, a certain proportion of node of random selecting is observer nodes, and the set that observer nodes is formed is called set O, and the number of observer nodes is that Ka(gets Ka/M=20 ~ 40% usually).The position of these observer nodes in figure G is known.The information that each observer nodes can gather comprises fire spread and from which node spreads to time of this node and fire.Such as, t
v,orepresent the time that fire spreads from the neighbor node v of observer nodes o.Obviously, observation information contains directional information and temporal information.
Concrete steps as shown in Figure 5, for:
31) obtain all ignition points, gather for T;
32) in set T, select observer nodes, gather for O;
33) obtain fire spread to observer nodes time and to;
34) output information.
40) inverting locating fire source position.
The present invention adopts maximum probability to locate criterion, namely finds one to estimate node
, it is the probability of burning things which may cause a fire disaster node
maximum.Because in figure G, the position of burning things which may cause a fire disaster node is considered to be random, so maximum probability (Maximum Likelihood) is estimated to be optimal estimation.
In spread process, observer nodes can provide two category informations: the direction that (a) fire spread arrives, and the node in set T can form a tree topology figure by this relation; B () fire spread arrives the time of observer nodes, be designated as the t time of advent
k.Such as, t
3represent at t
3in the moment, observer nodes 3 is arrived by fire spread.The set of the time of advent is used
represent.
Suppose that the time delay in all transmission meets Gaussian Profile (Gaussian IID) N (μ, σ
2), wherein, average value mu and variance б
2known.
Based on above definition and hypothesis, we can have following result:
By choosing observer nodes, according to them monitor the information obtained, substitute into formulae discovery can obtain one estimate burning things which may cause a fire disaster node location
.
Concrete steps as shown in Figure 6, for:
41) observation information chosen is inputted;
42) following formulae discovery fire location is utilized:
，
In formula,
represent burning things which may cause a fire disaster node location, μ
srepresent the time delay determined, Λ represents the covariance of time delay, d represents that the time delay that actual observation obtains, T represent that the point set that catches fire closes, and O represents observer nodes set, S is a node in T, | P (u, v) | represent the number on the limit comprised in the path of connected node u and node v, Ka represents the number of observer nodes, k and i is count index, and span is the integer between 1 to Ka-1;
43) burning things which may cause a fire disaster node location is exported
.
50) fire location is exported.Export the tank farm fire location calculated over the display.
In emulation experiment, as shown in Figure 7, oil tank node number is 10 × 10=100 to tank farm network model.Suppose that fire location as shown in Figure 8.In a certain moment after there is the condition of a fire, fire spread situation as shown in Figure 9.Now, state is that the node caught fire has 21, and wherein 21 × 40%=8 node is as observer nodes for random selecting, and observer nodes chooses situation as shown in Figure 10.After above information analysis being calculated, location burning things which may cause a fire disaster result as shown in figure 11.
Can see, the distance of estimated value distance burning things which may cause a fire disaster physical location only has 1 jumping, and acquired results is comparatively accurate.Under normal circumstances, the ratio Ka/M of the observer nodes of selection is higher, then estimate that the confidence level of fire location is higher.In actual applications, due to common estimated result
with real fire location S error usually within double bounce, so carry out in fire location search after model is estimated, maximum search scope may be limited to d
max=2 jump.
Claims (1)
1. a tank farm burning things which may cause a fire disaster localization method, it comprises the steps:
10) tank farm network model is set up;
20) spread process model is set up;
30) tank farm burning things which may cause a fire disaster locating information is obtained;
40) inverting locating fire source position;
50) fire location is exported;
Described tank farm network model (10) step of setting up comprises:
11) oil tank is modeled as network node, gathers for V;
12) fire spread path model is turned to limit, gather for E;
13) limited non-directed graph is set up, G={V, E};
14) tank farm network model is exported;
Described spread process model (20) step of setting up comprises:
21) initialization node state;
22) judge whether the new condition of a fire to be detected, if so, then carry out next step, no, then continue to detect;
23) current time is recorded; The source direction of record fire;
24) this node state is set to " catching fire ";
25) export the nodal information that catches fire, carry out the detection of the next round condition of a fire;
Described acquisition tank farm burning things which may cause a fire disaster locating information (30) step comprises:
31) obtain all ignition points, gather for T;
32) in set T, select observer nodes, gather for O;
33) obtain fire spread to observer nodes time and to;
34) output information;
It is characterized in that: described inverting locating fire source position (40) step comprises:
41) observation information chosen is inputted;
42) following formulae discovery fire location is utilized:
[μ
s]＝μ·(|P(s,o
k+1)|-|P(s,o
1)|)
k,i＝1,...,Ka-1
In formula,
represent burning things which may cause a fire disaster node location, μ
srepresent the time delay determined, Λ represents the covariance of time delay, d represents that the time delay that actual observation obtains, T represent that the point set that catches fire closes, and O represents observer nodes set, S represents a node in T, | P (u, v) | represent the number on the limit comprised in the path of connected node u and node v, Ka represents the number of observer nodes, k and i is count index, and span is the integer between 1 to Ka-1;
43) burning things which may cause a fire disaster node location is exported
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103458364B (en) * | 2013-09-09 | 2016-02-03 | 中国矿业大学 | A kind of coal mine gob spontaneous fire burning things which may cause a fire disaster point positioning system based on WSN |
| CN103905560B (en) * | 2014-04-11 | 2017-01-11 | 南京理工大学 | Oil tank area flame spread prediction and analysis method based on complex networks |
| CN106781187B (en) * | 2016-12-02 | 2019-04-09 | 武汉科技大学 | Scene of fire fire source area positioning method based on multidimentional system FM model |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101577032A (en) * | 2009-06-02 | 2009-11-11 | 汕头大学 | Wireless fire detector for early fire recognition |
| CN102636772A (en) * | 2012-03-19 | 2012-08-15 | 河北工业大学 | Rapid positioning system and method of sudden disastrous accident |
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| TWI247132B (en) * | 2004-09-21 | 2006-01-11 | Inst Information Industry | Method of efficiently building locating service for wireless network environment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101577032A (en) * | 2009-06-02 | 2009-11-11 | 汕头大学 | Wireless fire detector for early fire recognition |
| CN102636772A (en) * | 2012-03-19 | 2012-08-15 | 河北工业大学 | Rapid positioning system and method of sudden disastrous accident |
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