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Sediment concentration detection method based on second harmonic frequency shift

A second harmonic, sediment content technology, applied in the direction of using sonic/ultrasonic/infrasound for material analysis, measurement devices, processing of detected response signals, etc.

Active Publication Date: 2018-06-19
HOHAI UNIV CHANGZHOU
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Problems solved by technology

[0009] The main purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for detecting sediment content based on second harmonic frequency drift, which can better obtain the situation of sediment content in rivers and is beneficial to water conservancy projects. For quality monitoring and maintenance, it is especially suitable for the situation where the sediment content in the river is too high, and has industrial application value

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  • Sediment concentration detection method based on second harmonic frequency shift
  • Sediment concentration detection method based on second harmonic frequency shift
  • Sediment concentration detection method based on second harmonic frequency shift

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Embodiment Construction

[0055] Below in conjunction with accompanying drawing of description, the present invention will be further described.

[0056] The invention provides a sediment content detection method based on second harmonic frequency drift, comprising the following steps:

[0057] 1) Establish a liquid column model and derive the liquid one-dimensional nonlinear wave equation;

[0058] Specifically,

[0059] Modeling a Liquid Column

[0060]

[0061]

[0062]

[0063] Among them, ρ is the density of the medium when there is acoustic disturbance, υ is the particle velocity of the medium, t is the time, x is the propagation distance, p is the sound pressure, η' and η" are the viscosity coefficients of the fluid, c 0 is the speed of sound wave, P is the pressure, P 0 is the static value of pressure, ρ 0 is the medium density when there is no sound disturbance, and γ is the nonlinear coefficient of the medium;

[0064] make ρ=ρ 0 +ρ', ​​ρ' is the variation of medium density whe...

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Abstract

The invention discloses a sediment concentration detection method based on second harmonic frequency shift. The method comprises the following steps: 1) establishing a liquid column model and inferring a liquid one-dimensional nonlinear wave equation; 2) inferring an acoustic vibration pressure solution during second harmonic propagation with a perturbation method according to boundary conditions;3) performing Fourier transform on a signal function of the acoustic vibration pressure solution with simulation software to obtain a liquid theoretical spectrogram; 4) adding sediment to the liquidcolumn model to form an MC sediment model, analyzing acoustic vibration pressure solution during second harmonic propagation, and preforming simulation with the simulation software to obtain a theoretical frequency shift graph of the MC sediment model; 5) performing measurement with an actual instrument to obtain an actually measured spectrogram, and comparing the spectrogram with the liquid theoretical spectrogram to obtain the actually measured frequency shift amount; 6) enabling the actually measured frequency shift amount to correspond to theoretical frequency shift amount to obtain the actually measured sediment concentration. The detection precision and reliability are improved greatly.

Description

technical field [0001] The invention relates to a sediment content detection method, in particular to a sediment content detection method based on second harmonic frequency drift, and belongs to the technical field of ultrasonic detection and analysis. Background technique [0002] With the development of ultrasonic technology, the application of ultrasonic testing in the engineering field is becoming more and more frequent. The long-term accumulation of sediment in the river has a huge impact on water conservancy projects, and it also causes a lot of troubles for flood control. We must study the characteristics of sediment and fully grasp the law of sediment movement in order to ensure the smooth implementation and safe operation of water conservancy projects, so as to make the sediment as little as possible to silt the river course and prevent the occurrence of flood disasters. [0003] The propagation of ultrasonic waves in bounded fluids has strong nonlinearity, wide pr...

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Application Information

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IPC IPC(8): G01N29/44
CPCG01N29/4418
Inventor 韩庆邦仲晓敏蒋謇单鸣雷殷澄
Owner HOHAI UNIV CHANGZHOU
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