Pipeline leakage vibration signal adaptive time delay estimation method based on fourth-order cumulant
A fourth-order cumulant and vibration signal technology, which is applied in pipeline systems, mechanical equipment, gas/liquid distribution and storage, etc., can solve the problems of missing estimated parameters and large estimation errors, and achieve suppression of related noise and reduction of leakage location errors , Improve the effect of signal-to-noise ratio
Active Publication Date: 2020-03-31
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 pipeline leakage vibration signal adaptive time delay estimation method based on a fourth-order cumulant, which belongs to the technical field of fluid pipeline leakage monitoring. The method comprises the following steps: S1, a fluid pipeline leakage vibration signal is collected; S2, fourth-order cumulant operation is carried out on the pipeline leakage vibration signal; S3, recursive least squares (RLS) adaptive filtering is carried out; and S4, a time delay estimation result is obtained. According to the method, self-four-order accumulation operation and mutual-four-order accumulation operation are carried out on leakage vibration signals picked up by a sensor to obtain one-dimensional slices, the two one-dimensional slices can be used as two new time domainsignals, and the RLS adaptive filtering algorithm is adopted to filter related noise, so that the related noise is inhibited, the signal-to-noise ratio is improved, and time delay estimation errors are reduced. By means of the technology, related Gaussian noise generated by frequency dispersion and multi-mode characteristics of the fluid pipeline leakage vibration signals can be effectively restrained, the signal-to-noise ratio of the leakage vibration signals is increased, and therefore time delay estimation errors are reduced, and finally leakage positioning errors can be effectively reduced.
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