Non-contact pipeline fluid flow velocity measurement method based on frequency wavenumber domain spatial spectrogram

Through frequency wave number domain spatial spectrum diagram and MUSIC algorithm, combined with Kalman filtering, the large error and wear problems of traditional flow velocity measurement methods in complex fluids are solved, and high-precision flow velocity measurement and real-time correction are achieved.

CN120468451APending Publication Date: 2025-08-12NAT ENG RES CENT OF DREDGING TECH & EQUIP
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Patent Information

Application Number
CN202510520298.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-24
Publication Date
2025-08-12

AI Technical Summary

Technical Problem

Traditional flow velocity measurement methods have large measurement errors in complex fluids, and the service life of contact flow meters is limited, making it difficult to accurately estimate the flow velocity, especially in fluids containing solid particles such as sludge and sand.

Method used

Using a non-contact measurement method based on the frequency wave number domain spatial spectrum, turbulent signals are collected through piezoelectric thin film sensors, snap count segmentation and Fourier transform, and a three-dimensional frequency-wave number domain spectrum is constructed, and the flow rate calculation is performed by combining MUSIC algorithm and Kalman filtering.

Benefits of technology

It realizes high-precision flow velocity measurement, suppresses multipath interference and noise, is suitable for complex fluids, avoids wear problems of traditional methods, and provides real-time dynamic corrections.

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Abstract

The invention relates to the technical field of pipeline detection, and provides a non-contact pipeline fluid flow velocity measurement method based on a frequency wavenumber domain spatial spectrogram, and the method comprises the steps: collecting a turbulence signal in a pipeline through a piezoelectric film sensor; carrying out snapshot number segmentation on the turbulence signal to obtain a plurality of segmented turbulence time domain signals; fourier transform and narrowband signal processing are carried out on the segmented turbulence time domain signals, and a spatial spectrum corresponding to each narrowband signal component is obtained; constructing a three-dimensional frequency-wave number domain spectrogram according to the spatial spectrum function; and according to the three-dimensional frequency-wavenumber domain spectrogram, calculating the flow velocity of the pipeline fluid. According to the method, a three-dimensional spectrogram characteristic space is constructed through conjoint analysis of the frequency and the wave number, the angle, distance and frequency characteristics of the turbulence signals are decoupled through spatial spectrum estimation methods such as the MUSIC algorithm, multipath interference and noise are effectively restrained, the flow speed of fluid in a pipeline can be accurately estimated, and limitation in a traditional method is overcome.
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