Adaptive time-delay estimation method for pipeline leakage vibration signal based on fourth-order cumulant
A fourth-order cumulant, vibration signal technology, applied in pipeline systems, gas/liquid distribution and storage, mechanical equipment, etc., can solve problems such as large estimation errors and missing estimated parameters, reduce leakage location errors, and suppress related noise. , the effect of improving the signal-to-noise ratio
Active Publication Date: 2021-08-31
重庆富世恒睿物联网科技有限公司
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This method uses third-order self- and cross-cumulant estimation to suppress the relevant Gaussian noise, and then iteratively calculates the time delay through an adaptive filtering algorithm. However, when the signal-to-noise ratio of this method is low, the estimation error is large, and even the estimated parameters are lost.
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[0037] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic concept of the present invention, and the following embodiments and the features in the embodiments can be combined with each other in the case of no conflict.
[0038] Wherein, the accompanying drawings are for illustrative purposes only, and represent only schematic diagrams, rather than physical drawings, and should...
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The invention relates to a fourth-order cumulant-based adaptive time delay estimation method for pipeline leakage vibration signals, which belongs to the technical field of fluid pipeline leakage monitoring. The method includes the following steps: S1: collecting fluid pipeline leakage vibration signals; S2: performing fourth-order cumulant calculation on pipeline leakage vibration signals; S3: performing recursive least squares (RLS) adaptive filtering; S4: obtaining time delay estimation results . In the present invention, firstly, the leaked vibration signal picked up by the sensor is subjected to self- and mutual fourth-order cumulative operations to obtain one-dimensional slices. These two one-dimensional slices can be used as two new time-domain signals, and the RLS adaptive filtering algorithm is used to filter out related noises. Thereby, correlated noise is suppressed, a signal-to-noise ratio is improved, and delay estimation errors are reduced. Through this technology, it can effectively suppress the correlated Gaussian noise of the fluid pipeline leakage vibration signal due to dispersion and multi-modal characteristics, improve the signal-to-noise ratio of the leakage vibration signal, thereby reducing the time delay estimation error, and finally can effectively reduce the leakage location error.
Description
technical field [0001] The invention belongs to the technical field of fluid pipeline leakage monitoring, and relates to an adaptive time delay estimation method for pipeline leakage vibration signals based on fourth-order cumulants. Background technique [0002] As an efficient and convenient fluid transportation method, pipeline has been widely used in the transportation of natural gas, oil, water supply and other fluids. Due to pipeline aging, corrosion, man-made damage, etc., pipeline leakage occurs from time to time, causing huge losses. Therefore, it is of great social and economic value to study the location method of fluid pipeline leakage. Among them, the fluid pipeline leakage vibration location method based on time delay estimation has the advantages of fast detection response time and small leakage location error, and has been widely used. Chinese patent (CN108332063A) discloses a method for locating pipeline leaks based on cross-correlation delay estimation, wh...
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IPC IPC(8): F17D5/06
CPCF17D5/06
Inventor 李帅永韩明秀文井辉
Owner 重庆富世恒睿物联网科技有限公司