Fire positioning method based on smoke concentration

A technology of smoke concentration and positioning method, which is applied to fire alarms, special data processing applications, instruments, etc. that rely on smoke/gas interaction, and can solve problems such as large positioning errors, inapplicability, and high cost of optical fiber temperature measurement

Active Publication Date: 2016-12-21
HENAN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

The image-based fire source positioning technology is easily blocked by objects, resulting in large positioning errors and other problems; the technology based on optical fiber temperature measurement is too expensive and not suitable for general warehouses

Method used

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  • Fire positioning method based on smoke concentration
  • Fire positioning method based on smoke concentration
  • Fire positioning method based on smoke concentration

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Embodiment 1

[0064] Description of known conditions: in size 10×10×10m 3 There is a fire source in the warehouse (there is no other object in the warehouse except the fire source), and the time when the fire occurs is t 0 , arrange 16 sensor observation nodes at the top of the warehouse (Z=0), the arrangement of sensor observation points is as follows image 3 As shown, (the roof is flat, the wind speed is less than 0.1m / s, the measured air source strength is Q=25mg / s, and the diffusion coefficient D=0.08m 2 / s, noise w i is Gaussian noise).

[0065] t=1-50s, the smoke concentration value measured by the sensor As shown in Table 1.

[0066] Table 1 Smoke concentration values ​​measured by sensors

[0067]

[0068]

[0069]

[0070]

[0071] Among them: taking the first row of data in the table as an example, at t=1s,

[0072] means (x 1 ,y 1 ) corresponds to the smoke concentration value measured by the sensor at the position of coordinates (-4,4);

[0073] mean...

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Abstract

The invention belongs to the fire positioning field, particularly relates to a fire positioning method on the basis of smoke concentration, is on the basis of a wireless sensor network and carries out positioning estimation on a fire source point through utilizing smoke concentration acquired by the concentration sensor on the basis of a smoke diffusion model. The method comprises steps that 1, the smoke diffusion model under the no wind environment is established, and a relationship between gas concentration under the no wind condition and a distance is determined; 2, on the basis of weight fusion of the gas concentration and a least square method, a fire source zone is positioned; 3, on the basis of a K-means cluster method, cluster analysis on the fire source zone positioned in the step 2 is carried out, and a fire source point is determined. The positioning method is applicable to conditions that a fire is at an early stage, a roof is flat, a wind speed is relatively small, and only a single fire source point exists, a smoke flow is taken as a two-dimensional plane, through the fire positioning method, a place below the zone of a positioning result is taken as a fire generation zone. The fire positioning method has advantages of low energy consumption, timeliness, low cost, interference resistance and strong practicality.

Description

technical field [0001] The invention belongs to the technical field of fire location, and mainly relates to a fire location method based on smoke concentration. Background technique [0002] Existing fire source location technology is generally based on temperature field, image theory and optical fiber temperature measurement technology. When changing, the burning has actually been going on for a while. A large number of studies have shown that in the early smoldering state of the fire, the heat released is small, but a large amount of smoke is produced, and the temperature rise is not obvious. The image-based fire source positioning technology is easily blocked by objects, resulting in large positioning errors and other problems; the technical cost based on optical fiber temperature measurement is too high, and it is not suitable for general warehouses. Contents of the invention [0003] The object of the present invention is to propose a fire location method with lower...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/62G06F17/50G08B17/10
CPCG08B17/10G06F30/20G06F18/23213G06F18/25
Inventor 冯肖亮闫东文成林宋强闫晶晶
Owner HENAN UNIVERSITY OF TECHNOLOGY
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