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Sound source localization method for cylindrical liquid storage tank floor based on early arrival waves

A sound source location and liquid storage tank technology, which is applied in the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, process detection response signals, and special data processing applications. It can solve the problems of many reflected sound waves and difficult identification of sound waves.

Inactive Publication Date: 2014-11-05
LOGISTICAL ENGINEERING UNIVERSITY OF PLA
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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

Method used

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  • Sound source localization method for cylindrical liquid storage tank floor based on early arrival waves
  • Sound source localization method for cylindrical liquid storage tank floor based on early arrival waves
  • Sound 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 of R=4.5m and a liquid level of H=7.32m, five sensors are installed on the wall plate 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. Start with the signal detected by the first sensor, and intercept the subsequent ΔT 1 = 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 le...

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Abstract

The invention discloses a sound source localization method for a cylindrical liquid storage tank floor based on early arrival waves. The sound source localization method comprises the following steps: a time characteristic sequence of signals which are actually measured by sensors is calculated; then, the floor is subjected to even discretization to form a plurality of grids (each grid point represents a possible sound source position), and the early wave arrival time of sound waves which are sent out from the grid points spent on arriving each sensor is calculated to construct a wave arrival characteristic sequence according to a sound source propagation path calculation method for the cylindrical liquid storage tank floor, which is provided by the invention based on the acoustic wave propagation theory; next, the matching degree of each grid point wave arrival time characteristic sequence and the measured signal time characteristic sequence is calculated; finally, the grid point with the highest matching degree is the desired sound source position.

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 Applications(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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