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Acoustic reconstruction method of three-dimensional temperature field in furnace considering sound ray bending behavior

A three-dimensional temperature and sound ray technology, which is applied in the field of acoustic reconstruction of the three-dimensional temperature field in the furnace considering the bending behavior of the sound ray, can solve problems such as no guidance plan, and achieve the effect of overcoming the influence

Inactive Publication Date: 2017-11-07
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

The above technologies have not given specific guidance on how to track the sound ray propagation path, improve the temperature field reconstruction accuracy, and overcome the influence of sound ray bending on the temperature field reconstruction accuracy.

Method used

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  • Acoustic reconstruction method of three-dimensional temperature field in furnace considering sound ray bending behavior
  • Acoustic reconstruction method of three-dimensional temperature field in furnace considering sound ray bending behavior
  • Acoustic reconstruction method of three-dimensional temperature field in furnace considering sound ray bending behavior

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Embodiment

[0037] Embodiment: The acoustic reconstruction method of the three-dimensional temperature field in the furnace considering the sound ray bending behavior of the present invention includes the following steps:

[0038] Step 1: Arrange several acoustic wave transceivers on the three-dimensional furnace surface in advance, form m effective acoustic wave paths through the measured area, and evenly divide the measured area into n grids (that is, discretize the furnace area to form n grid), nfigure 1 shown. figure 1 Given in is the effective sound wave path without considering the phenomenon of sound ray bending, that is, the straight line path. Open and close each sound wave emitter sequentially in a detection period to make it emit sound waves in turn, and ensure that at most one emitter emits sound waves at a time. When any transmitter emits a sound wave, all receivers receive the sound wave. Measure the propagation time of sound waves on m effective paths and combine them to ...

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Abstract

An acoustic reconstruction method for the three-dimensional temperature field in a furnace considering the bending behavior of sound rays. Several acoustic transceivers are arranged on the surface of the three-dimensional furnace, and the furnace is divided into n grids, and m effective acoustic paths are formed between the acoustic transceivers , passing through each grid inside the furnace. Calculate the length of each path passing through each grid in the case of straight-line propagation of sound waves to form a matrix L. The propagation time of the sound wave on each path is measured to form a matrix t, and the sound velocity and temperature at the geometric center point of each grid are reconstructed. Reconstruct the temperature field according to the obtained temperature, use the Fermat principle to obtain the sound ray trajectory of each path, and calculate the length of each path passing through each grid to form a reconstruction matrix L' considering the sound ray bending. Then, the sound velocity and temperature at the geometric center point of each grid are reconstructed from the matrix L' and matrix t. Repeat the above process, and use the iterative method to gradually approach the precise value of the temperature field. The invention can track the propagation path of the sound ray, and improves the reconstruction accuracy of the temperature field.

Description

technical field [0001] The invention relates to a method for reconstructing a three-dimensional temperature field in a furnace based on a finite element subdivision method, in particular to an acoustic reconstruction method for a three-dimensional temperature field in a furnace considering the bending behavior of sound rays. The invention utilizes the sound ray bending phenomenon that occurs in the non-uniform temperature field of the sound wave, uses the Fermat principle to track the sound ray, and continuously improves the reconstruction accuracy of the temperature field through an iterative method. Background technique [0002] The basic principle of acoustic temperature measurement is based on the single-valued functional relationship between the speed of sound wave propagation and the temperature of the medium, which satisfies the relationship: [0003] [0004] Among them, c is the propagation speed of sound wave in the medium, m / s; R is the universal gas constant, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/24
Inventor 姜根山袁月许伟龙
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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