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Acoustic Source Localization Method for Cylindrical Liquid Storage Tank Floor Based on Early Arrival Waves

A technology for sound source localization and liquid storage tank, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, processing of detected response signals, special data processing applications, etc.

Inactive Publication Date: 2017-01-04
LOGISTICAL ENGINEERING UNIVERSITY OF PLA
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  • Description
  • Claims
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Problems solved by technology

Because the cylindrical storage tank is a closed space, the reflected sound waves that arrive at the sensor at the same time in the later stage of propagation are very complicated, and are regarded as random sound waves. Considering the attenuation factors comprehensively, these sound waves are difficult to identify when mixed with background noise

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  • Acoustic Source Localization Method for Cylindrical Liquid Storage Tank Floor Based on Early Arrival Waves
  • Acoustic Source Localization Method for Cylindrical Liquid Storage Tank Floor Based on Early Arrival Waves
  • Acoustic Source Localization Method for Cylindrical Liquid Storage Tank Floor Based on Early Arrival Waves

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Embodiment Construction

[0039] The present invention will be described in detail below in conjunction with an example. The artificially simulated sound source is located at the coordinate position (-0.5, 0, 0).

[0040] (1) For a water storage tank made of carbon steel with a radius R=4.5m and a liquid level height H=7.32m, five sensors are installed on the wall at a height of 0.2m from the bottom plate on average, such as figure 1 shown. After the simulated sound source is excited, the five sensors all detect the acoustic signal. The measured signals of the simulated sound source arriving at each sensor are as follows: figure 2 shown.

[0041] (2) Extract the early time-of-arrival feature P of the measured signal of the sensor. Starting with the signal detected by the first sensor, intercept the subsequent ΔT 1 = the signal within 19ms; calculate the energy in the measured signal unit time (ΔT=0.1ms), and obtain the energy sequence of the measured signal; normalize the energy sequence, the leng...

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Abstract

The invention discloses a method for locating a sound source of a bottom plate of a cylindrical liquid storage tank based on early arrival waves. The present invention firstly calculates the time characteristic sequence of the measured signal of the sensor; then, evenly discretizes the bottom plate into multiple grids (each grid point represents a possible sound source position), based on the sound wave propagation theory, according to the cylindrical storage tank proposed by the present invention The sound source propagation path calculation method of the liquid tank bottom plate calculates all the early arrival times of the sound waves emitted by the grid points to each sensor, and constructs the arrival time characteristic sequence; then, calculates the arrival time characteristic sequence of each grid point and the matching degree of the time feature sequence of the measured signal; finally, the grid point with the highest matching degree is found to be the position of the sound source.

Description

technical field [0001] Acoustic Source Localization Method for Cylindrical Liquid Storage Tank Floor Based on Early Arrival Waves Background technique [0002] Acoustic emission technology has become a routine detection method for detecting the deterioration state of the bottom plate of cylindrical liquid storage tanks. The bottom plate of a cylindrical liquid storage tank excites an acoustic signal due to corrosion, deformation, etc., and the signal can be captured by a sensor installed on the tank wall. By calculating the time difference of the signal arriving at the sensor, the location algorithm can be used to calculate the location of the sound source. The detection lasts for a period of time and finally generates a distribution map of the sound source of the bottom plate of the liquid storage tank, based on which the user can understand the quality status of the bottom plate of the oil storage tank. [0003] At present, there are two types of sound source localizatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/07G01N29/44G06F19/00
Inventor 方卫红邬晓岚税爱社宗福兴李先利
Owner LOGISTICAL ENGINEERING UNIVERSITY OF PLA
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