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A U-tube blockage state assessment method based on low-frequency sound pressure signal analysis

A technology of sound pressure signal and state assessment, applied in the direction of acoustic presence detection, seismology, instruments, etc., can solve the problem of pipeline blockage being difficult to distinguish, and achieve the effect of timely troubleshooting, reducing environmental pollution and reducing property losses.

Active Publication Date: 2022-05-13
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

[0003] In order to solve the problem that it is difficult to distinguish the clogging degree of pipelines in different degrees during the U-shaped tube clogging detection process, the present invention provides a U-shaped tube clogging state evaluation method based on low-frequency sound pressure signal analysis

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  • A U-tube blockage state assessment method based on low-frequency sound pressure signal analysis
  • A U-tube blockage state assessment method based on low-frequency sound pressure signal analysis
  • A U-tube blockage state assessment method based on low-frequency sound pressure signal analysis

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Embodiment 1

[0025] Embodiment 1: U-shaped pipe blockage state evaluation method based on low-frequency sound pressure signal analysis, its low-frequency sound pressure signal acquisition device is as attached figure 1 shown. During the specific implementation, two telescopic rods penetrate from the top of the U-shaped tube to the bottom of the pipe, and the underwater speaker fixed at the lower end of the telescopic rod I emits sound wave signals in the U-shaped tube. The speaker model is selected from the American EV UW30 underwater speaker. The signal is generated by a computer-controlled sound card equipped with WinLMS software to generate a 10-second sine sweep sound signal. The sound card model is ASUS Xonar D-Kara, and the frequency range of the signal is 100-6000 Hz. B&K Type 2708 power amplifier is used to drive the underwater Loudspeaker; the hydrophones H1-H3 are placed at the bottom of the telescopic bracket II, and an 8-channel high-pass filter is used to remove unnecessary lo...

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Abstract

The invention discloses a U-shaped pipe blockage state evaluation method based on low-frequency sound pressure signal analysis, and belongs to the field of pipe blockage fault diagnosis. The present invention first uses the low-frequency sound pressure signal acquisition device to obtain the sound pressure impulse response signal of the U-shaped tube, then performs variational mode decomposition on the low-frequency sound pressure signal, and determines the optimal mode of the variational mode decomposition according to the component amplitude spectrogram The state decomposition number K is used to screen the effective IMF components through sound pressure level transformation; then the multi-scale entropy features of the effective IMF components are extracted, and the feature vectors reflecting the different degrees of blockage of the U-shaped tube are constructed, and finally the feature vectors are used for continuous hidden Marko U-tube model training to establish a model that can evaluate the U-shaped tube blockage state. The method proposed by the invention can identify different degrees of blockage states in the U pipeline, and improves the accuracy of the identification results.

Description

technical field [0001] The invention relates to a U-shaped pipe blockage state evaluation system based on low-frequency sound pressure signal analysis, which belongs to the field of pipeline fault diagnosis. Background technique [0002] Pipeline transportation is widely used in our production and life, from water supply and drainage in daily life, transportation of chemical raw materials, minerals and oil and gas to irrigation of farmland. With urbanization, the network of underground utility sewers serving our towns and cities has become one of the most important parts of our infrastructure. With the increase of service life, drainage pipes are extremely prone to clogging and failure. At present, the researched pipes are mainly focused on conventional pipes (straight pipes, straight pipes with fittings and side branches), while special pipes (U-shaped pipes, pipes with abrupt cross-sections, inclined pipes) are less studied at this stage. In the plumbing system, it is th...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/00
CPCG01V1/001
Inventor 冯早伍林峰吴建德王晓东范玉刚黄国勇邹金慧
Owner KUNMING UNIV OF SCI & TECH