U-shaped pipe blockage state evaluation method based on low-frequency sound pressure signal analysis
A sound pressure signal and state evaluation technology, which is applied in the direction of sound presence detection, seismology, instruments, etc., can solve the problems such as difficult to distinguish pipeline blockages, and achieve the effects of timely troubleshooting, reducing property losses and environmental pollution
Active Publication Date: 2020-01-10
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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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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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 pipeline blockage fault diagnosis. The methodcomprises the steps of acquiring a sound pressure pulse response signal of a U-shaped pipe by using a low-frequency sound pressure signal acquisition device, performing variational modal decomposition on the low-frequency sound pressure signal, determining an optimal modal decomposition number K of the variational modal decomposition according to a component amplitude spectrogram and screening aneffective IMF component through sound pressure level transformation, extracting multi-scale entropy features of the effective IMF component, constructing feature vectors reflecting different degreesof blockage states of the U-shaped pipe, finally applying the feature vectors to continuous hidden Markov model training, and establishing a model capable of evaluating the blockage state of the U-shaped pipe. According to the method provided by the invention, the different degrees of the blockage states in the U-shaped pipeline can be identified, and the accuracy of an identification result is improved.
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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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