Quality inspection method and system for water conservancy project pipelines

Abstract

The present invention relates to the technical field of pipeline quality detection, and in particular to a quality detection method and system for water conservancy engineering pipelines, the method comprising: obtaining water pressure data inside the water conservancy engineering pipeline to be detected and ultrasonic detection data of the pipeline wall; determining the water pressure parameters of the water conservancy engineering pipeline according to the water pressure data under different water flow rates, the water pressure parameters characterizing the degree to which the quality of the water conservancy engineering pipeline is affected by the water hammer effect; determining the ultrasonic parameters of the water conservancy engineering pipeline according to the ultrasonic detection data, the ultrasonic parameters characterizing the defect information existing in the water conservancy engineering pipeline; determining the load parameters of the water conservancy engineering pipeline based on the water pressure parameters, the ultrasonic parameters and the damage value of the water conservancy engineering pipeline; determining the quality grade of the water conservancy engineering pipeline corresponding to the load parameters according to the corresponding relationship between the preset load parameters and the quality grade of the water conservancy engineering pipeline. The present invention improves the accuracy, reliability and real-time performance of the quality detection of the water conservancy engineering pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline quality detection, and in particular to a quality detection method and system for water conservancy project pipelines. Background Art

[0002] Water conservancy projects refer to a series of activities that develop, utilize, manage and protect water resources through artificial means. These activities include the construction of reservoirs, dams, irrigation systems, flood control projects and soil and water conservation projects. In water conservancy projects, water conservancy pipelines are an important part of transporting and distributing water resources. These pipelines can be used for a variety of purposes such as water supply, irrigation, drainage and flood control.

[0003] In some scenarios, it is necessary to monitor the quality of water conservancy project pipelines to ensure the stability and safety of water conservancy projects. Common methods for detecting water conservancy project pipelines include visual inspection, which monitors the surface status of water conservancy project pipelines to determine whether there are any quality problems with water conservancy project pipelines. However, this detection method can only identify some obvious faults on the surface of the pipeline, and it is difficult to detect hidden faults or old pipelines, resulting in low reliability and accuracy of the quality detection results of water conservancy project pipelines, thus affecting the stability and safety of water conservancy projects. Summary of the invention

[0004] In order to solve the technical problem of low reliability and accuracy of the quality inspection results of water conservancy project pipelines, the purpose of the present invention is to provide a quality inspection method and system for water conservancy project pipelines. The technical scheme adopted is as follows:

[0005] In the first aspect, an embodiment of the present invention provides a quality inspection method for water conservancy project pipelines, including: obtaining water pressure data inside the water conservancy project pipeline to be inspected and ultrasonic inspection data of the pipeline wall, the water pressure data and the ultrasonic inspection data are measured when the water hammer effect occurs in the water conservancy project pipeline at different water flow rates; determining the water pressure parameters of the water conservancy project pipeline according to the water pressure data at different water flow rates, the water pressure parameters characterizing the degree to which the quality of the water conservancy project pipeline is affected by the water hammer effect; determining the ultrasonic parameters of the water conservancy project pipeline according to the ultrasonic inspection data, the ultrasonic parameters characterizing defect information existing in the water conservancy project pipeline; determining the load parameters of the water conservancy project pipeline based on the water pressure parameters, the ultrasonic parameters and the damage value of the water conservancy project pipeline; determining the quality grade of the water conservancy project pipeline corresponding to the load parameters according to the correspondence between the preset load parameters and the quality grade of the water conservancy project pipeline.

[0006] Optionally, determining the water pressure parameters of a water conservancy project pipeline based on water pressure data at different water flow rates includes: determining an upper envelope and a lower envelope of the water pressure data at any water flow rate; performing curve fitting on the upper envelope and the lower envelope, respectively, to obtain an upper attenuation function corresponding to the upper envelope and a lower attenuation function corresponding to the lower envelope; determining the value of an undetermined coefficient based on the upper attenuation function and the lower attenuation function; determining the water pressure factor at different water flow rates using the value of the undetermined coefficient, the sign parameter corresponding to the undetermined coefficient, and preset parameters; decomposing the water pressure data at each flow rate to obtain a trend term, a periodic term, and a residual term of the water pressure data; determining a change vector of the water pressure data based on the trend term, the periodic term, and the residual term; determining the characteristic parameters of the water conservancy project pipeline based on the cosine similarity between the change vectors of the water pressure data at adjacent water flow rates; and determining the water pressure parameters of the water conservancy project pipeline using the water pressure factors and characteristic parameters at different water flow rates.

[0007] Optionally, determining the water pressure factor under different water flow rates using the numerical values ​​of the unknown coefficients, the sign parameters corresponding to the unknown coefficients, and the preset parameters includes: calculating the first product of the numerical value and the sign parameter of any unknown coefficient in the lower attenuation function under any water flow rate, and calculating the absolute value of the first sum between the numerical value of any unknown coefficient in the upper attenuation function and the first product; determining the reciprocal of the absolute value of the first sum and the second sum of the preset parameters; and determining the superposition value of the reciprocal of the second sum corresponding to each unknown coefficient as the water pressure factor under any water flow rate.

[0008] Optionally, determining the change vector of water pressure data based on the trend term, the periodic term and the residual term includes: performing a straight line fit on the trend term using the least squares method to obtain a fitted straight line; determining the slope and intercept of the fitted straight line and the minimum positive period of the periodic term; obtaining the standard deviation and mean of all data points in the residual term; and using the vector consisting of the slope, intercept, minimum positive period, standard deviation and mean as the change vector of the water pressure data.

[0009] Optionally, determining the characteristic parameters of the water conservancy project pipeline based on the cosine similarity between the change vectors of water pressure data under adjacent water flow rates includes: calculating the first difference between the cosine similarities between the change vectors of water pressure data under any two adjacent water flow rates; and superimposing each first difference to obtain the characteristic parameters of the water conservancy project pipeline.

[0010] Optionally, determining the water pressure parameters of a water conservancy project pipeline using water pressure factors and characteristic parameters under different water flow rates includes: using the water pressure factor as the vertical axis of a two-dimensional rectangular coordinate system and the water flow rate as the horizontal axis of the two-dimensional rectangular coordinate system, mapping the water pressure factors corresponding to all water flow rates to the two-dimensional rectangular coordinate system to obtain multiple discrete points; using the least squares method to perform curve fitting on each discrete point to obtain a water pressure factor curve, and determining the water flow rate corresponding to the data point with the largest curvature value in the water pressure factor curve as the damage value; performing straight line fitting on the two curve segments before and after the damage value to obtain a first straight line and a second straight line; obtaining a first slope of the first straight line and a second slope of the second straight line; calculating a first ratio of the second slope to a third sum of the first slope and a preset parameter; calculating a second product between the water pressure factor under each water flow rate and the characteristic parameter of the water conservancy project pipeline, and superimposing each second product to obtain a superimposed value; determining the third product between the superimposed value and the first ratio as the water pressure parameter of the water conservancy project pipeline.

[0011] Optionally, determining the ultrasonic parameters of the water conservancy project pipeline based on the ultrasonic detection data includes: decomposing the ultrasonic detection data to obtain IMF components of the ultrasonic detection data; taking the ultrasonic detection data corresponding to the water flow rate less than the damage value as the initial ultrasonic data, and taking the ultrasonic detection data corresponding to the water flow rate greater than or equal to the damage value as the later ultrasonic data; calculating the Pearson correlation coefficient between the IMF components of the same layer between any initial ultrasonic data and any later ultrasonic data; counting all Pearson correlation coefficients corresponding to each layer of IMF components, and calculating the mean and standard deviation of all Pearson correlation coefficients corresponding to each layer of IMF components; calculating the second ratio of the mean to the standard deviation, and sorting the second ratios in descending order; selecting the layers corresponding to the first n IMF components in the sort and removing them, and inversely processing the remaining IMF components of each layer to obtain new ultrasonic data corresponding to each ultrasonic detection data, where n is a natural number greater than or equal to 1; and determining the ultrasonic parameters of the water conservancy project pipeline using the new ultrasonic data under any adjacent water flow rates.

[0012] Optionally, determining the ultrasonic parameters of the water conservancy project pipeline using new ultrasonic data under any adjacent water flow rates includes: performing Fourier transform on the new ultrasonic data to obtain a spectrum of the new ultrasonic data; obtaining the number of peaks in the spectrum of each new ultrasonic data; calculating the second difference between the numbers of peaks in the spectrum of the new ultrasonic data under any adjacent water flow rates; and superimposing the second differences to obtain the ultrasonic parameters of the water conservancy project pipeline.

[0013] Optionally, determining the load parameters of the water conservancy project pipeline based on the water pressure parameters, ultrasonic parameters and the damage value of the water conservancy project pipeline includes: calculating the fourth product between the water pressure parameters and the ultrasonic parameters, and the third ratio between the damage value and the fourth product; normalizing the third ratio using a normalization function to obtain a normalized result; and determining the third difference between the fifth product between the predetermined coefficient and the normalized result and the predetermined value as the load parameter of the water conservancy project pipeline.

[0014] In a second aspect, an embodiment of the present invention provides a quality inspection system for water conservancy project pipelines, comprising: a processor and a memory; wherein the memory is used to store computer programs that can be run on the processor; the processor is used to execute the program stored in the memory to implement the steps of the quality inspection method for water conservancy project pipelines mentioned in the first aspect.

[0015] The present invention has the following beneficial effects: firstly, water pressure data inside a water conservancy project pipeline to be detected and ultrasonic detection data of a pipeline wall are obtained, wherein the water pressure data and the ultrasonic detection data are measured when a water hammer effect occurs in the water conservancy project pipeline at different water flow rates; then, water pressure parameters of the water conservancy project pipeline are determined according to the water pressure data at different water flow rates, wherein the water pressure parameters characterize the degree to which the quality of the water conservancy project pipeline is affected by the water hammer effect; then, ultrasonic parameters of the water conservancy project pipeline are determined according to the ultrasonic detection data, wherein the ultrasonic parameters characterize defect information existing in the water conservancy project pipeline; secondly, load parameters of the water conservancy project pipeline are determined based on the water pressure parameters, the ultrasonic parameters and the damage value of the water conservancy project pipeline; finally, the quality grade of the water conservancy project pipeline corresponding to the load parameters is determined according to the corresponding relationship between the preset load parameters and the quality grade of the water conservancy project pipeline.

[0016] In this way, the water pressure data can reflect the dynamic response of the fluid in the water conservancy project pipeline, and the ultrasonic detection data can reveal the internal structure and defects of the water conservancy project pipeline. Therefore, the embodiment of the present invention can accurately reflect the state of the water conservancy project pipeline under dynamic load by monitoring the pressure fluctuation inside the pipeline caused by the water hammer effect, thereby revealing the potential quality defects of the water conservancy project pipeline. Therefore, by using the water hammer effect in combination with the water pressure data inside the water conservancy project and the ultrasonic detection data of the pipeline wall, not only can the accuracy, reliability and real-time performance of the quality detection of the water conservancy project pipeline be improved, but also the defects and changes inside the water conservancy project pipeline can be effectively identified, further improving the stability and safety of the water conservancy project. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A flow chart of a quality inspection method for water conservancy project pipelines provided by one embodiment of the present invention;

[0019] Figure 2 A schematic diagram of a process of generating a water hammer effect provided by an embodiment of the present invention;

[0020] Figure 3 A schematic diagram of a process in which water pressure data changes over time when a water hammer effect occurs, provided by an embodiment of the present invention;

[0021] Figure 4 A schematic diagram of an upper envelope and a lower envelope of water pressure data provided by an embodiment of the present invention;

[0022] Figure 5 A schematic diagram of a water pressure factor curve provided by an embodiment of the present invention;

[0023] Figure 6 A schematic diagram of EMD decomposition of ultrasonic detection data provided by an embodiment of the present invention;

[0024] Figure 7 A schematic structural diagram of a quality inspection system for water conservancy project pipelines provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of a quality inspection method and system for water conservancy project pipelines proposed by the present invention, its specific implementation method, structure, features and effects, in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0026] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0027] The following is a detailed description of a method and system for quality inspection of water conservancy project pipelines provided by the present invention in conjunction with the accompanying drawings.

[0028] Embodiment 1:

[0029] See also Figure 1 , which shows a flow chart of a quality inspection method for a water conservancy project pipeline provided by an embodiment of the present invention, including:

[0030] S101, obtaining water pressure data inside the water conservancy project pipeline to be inspected and ultrasonic inspection data of the pipeline wall.

[0031] Among them, the water pressure data and ultrasonic detection data are measured when water hammer effect occurs in the water conservancy project pipeline at different water flow rates.

[0032] Specifically, the water conservancy project pipeline to be inspected refers to the water conservancy project pipeline that needs to be inspected for quality, and a variety of sensors are installed on the water conservancy project pipeline to be inspected. Specifically, a pressure sensor is installed on the inner wall of the water conservancy project pipeline to detect the water pressure changes inside the water conservancy project pipeline. An ultrasonic sensor is installed on the outer wall of the water conservancy project pipeline and fixed firmly to avoid displacement or vibration during the detection process. During installation, it is installed according to the optimal angle of ultrasonic propagation speed to ensure that the ultrasonic signal can effectively penetrate the water conservancy project pipeline and return to the receiver. Among them, the optimal angle of ultrasonic propagation speed is usually 90 degrees or 45 degrees.

[0033] Furthermore, when measuring the water pressure data and ultrasonic detection data, water flows of different flow rates are used to pass through the interior of the water conservancy project pipeline, and the water pressure data and ultrasonic detection data of the water conservancy project pipeline are obtained through a variety of sensors. In the embodiment of the present invention, the initial flow rate of the water conservancy project pipeline is set to ( , cubic meters per second), and gradually increase the flow rate of water in the water conservancy project pipeline, and the corresponding increase step size is , until an obvious rupture appears in the water conservancy project pipeline. In the experiment, it is generally believed that a crack with a length greater than or equal to 2 cm on the water conservancy project pipeline is an obvious rupture. The number of different flow rates of water in the water conservancy project pipeline is obtained. After the water flow in the water conservancy project pipeline is stabilized each time, the valve of the water conservancy project pipeline is closed to cause a water hammer effect in the water conservancy project pipeline, and the closing speed of the valve is ensured to remain unchanged each time the valve is closed. The water pressure data in the water conservancy project pipeline is obtained through the pressure sensor, and the ultrasonic detection data is obtained through the ultrasonic sensor.

[0034] Furthermore, the water pressure data and the ultrasonic detection data are both time series data. In order to improve the quality of the data, the water pressure data and the ultrasonic detection data may be subjected to Gaussian filtering and then subjected to subsequent processing.

[0035] For example, Figure 2A schematic diagram of a process of generating a water hammer effect provided by an embodiment of the present invention, Figure 2 In the process, when the valve is closed, the water is in a static state. When the valve is opened, the water is in a flowing state. When the valve is closed again, a water hammer effect will occur. The water hammer effect will cause pressure fluctuations in the water conservancy project pipeline. When the water pressure fluctuation exceeds the upper limit of the water conservancy project pipeline, the water conservancy project pipeline will be damaged to varying degrees. In the early stage of the loss of the water conservancy project pipeline, the water conservancy project pipeline will have local deformation or small cracks. These damages will be reflected in the pressure changes in the water conservancy project pipeline and the changes in the ultrasonic detection data of the water conservancy project pipeline. In addition, the degree of influence of the water hammer effect on the water conservancy project pipeline is directly related to the water flow in the water conservancy project pipeline. The greater the water flow in the water conservancy project pipeline, the greater the fluctuation of the water pressure generated by the water hammer effect in the water conservancy project pipeline, that is, the degree of damage or destruction to the water conservancy project pipeline will become greater. Therefore, the embodiment of the present invention detects the quality of the water conservancy project pipeline through the water hammer effect to detect the bearing capacity of the water conservancy project pipeline under extreme conditions.

[0036] For example, Figure 3 As shown, Figure 3 A schematic diagram of the process of water pressure data changing over time when a water hammer effect occurs is provided in one embodiment of the present invention. Figure 3 It can be seen that the greater the water flow in the water conservancy project pipeline, the greater the pressure fluctuation amplitude generated when the valve is closed, and it will gradually decay. When the water conservancy project pipeline is damaged by the water hammer effect and deformed or has small cracks, the damaged part will accelerate the weakening of the pressure fluctuation, that is, accelerate the decay process of the water pressure data.

[0037] S102, determining the water pressure parameters of the water conservancy project pipeline according to the water pressure data at different water flow rates.

[0038] Among them, the water pressure parameter represents the degree to which the quality of the water conservancy project pipeline is affected by the water hammer effect.

[0039] Specifically, when determining the water pressure parameters of a water conservancy project pipeline, as an optional embodiment of the present invention, first determine the upper envelope and lower envelope of the water pressure data at any water flow rate; then curve fitting is performed on the upper envelope and the lower envelope respectively to obtain an upper attenuation function corresponding to the upper envelope and a lower attenuation function corresponding to the lower envelope; then determine the value of the undetermined coefficient according to the upper attenuation function and the lower attenuation function; secondly, determine the water pressure factor at different water flow rates using the value of the undetermined coefficient, the sign parameter corresponding to the undetermined coefficient and the preset parameter; and decompose the water pressure data at each flow rate to obtain the trend term, periodic term and residual term of the water pressure data; then determine the change vector of the water pressure data according to the trend term, periodic term and residual term; and determine the characteristic parameters of the water conservancy project pipeline according to the cosine similarity between the change vectors of the water pressure data at adjacent water flow rates; finally, determine the water pressure parameters of the water conservancy project pipeline using the water pressure factor and characteristic parameters at different water flow rates.

[0040] For example, Figure 4 As shown, Figure 4 A schematic diagram of an upper envelope and a lower envelope of water pressure data provided by an embodiment of the present invention. Figure 4 In the example, the upper envelope is represented by 401 and the lower envelope is represented by 402. The upper and lower envelopes of the water pressure data under any water flow rate are obtained, and the function Combined with the least squares method, the upper envelope and the lower envelope are fitted separately to obtain the upper attenuation function of the upper envelope. and the lower decay function .in, is a natural constant, , , , They are all unknown coefficients, and their specific values ​​can be determined through the curve fitting process.

[0041] Furthermore, the water pressure factor analyzes the envelope of the water pressure data, and based on the overall change profile of the water pressure data, reflects the attenuation and fluctuation of the water pressure data in the water conservancy project pipeline after the water hammer effect occurs at the corresponding water flow rate. The value of the water pressure factor specifically reflects the attenuation rate of the water pressure data after the water hammer effect occurs in the water conservancy project pipeline at the corresponding water flow rate. When determining the water pressure factor at different water flow rates, as an optional embodiment of the present invention, the first product of the numerical value and the sign parameter of any undetermined coefficient in the lower attenuation function at any water flow rate is calculated, and the absolute value of the first sum between the numerical value and the first product of any undetermined coefficient in the upper attenuation function is calculated; the absolute value of the first sum and the reciprocal of the second sum of the preset parameter are determined; and the superposition value of the reciprocal of the second sum corresponding to each undetermined coefficient is determined as the water pressure factor at any water flow rate.

[0042] Specifically, the embodiment of the present invention uses the following formula to calculate the water pressure factor under any water flow rate:

[0043]

[0044] In the above formula, Represents the water pressure factor at any water flow rate. Represents the value of the undetermined coefficient in the upper attenuation function for any water flow rate. Represents the value of the unknown coefficient in the lower decay function for any water flow rate. represents the set of undetermined coefficients. Indicates the sign parameter. Since the numerical sign of the unknown coefficient a in the attenuation function of the water pressure data is opposite, while the numerical signs of the unknown coefficients b and c are consistent, in order to ensure the rationality of the signs in the formula, When or hour, ;when or hour, .in, and The values ​​of can be the same or different, and the embodiment of the present invention is not limited thereto.

[0045] , , All are undetermined coefficients. Represents a preset parameter to avoid the denominator being 0, and is preset to 0.1 based on experience. represents the absolute value function.

[0046] Furthermore, when determining the change vector of water pressure data, as an optional embodiment of the present invention, the trend term is fitted with a straight line using the least squares method to obtain a fitted straight line; the slope and intercept of the fitted straight line and the minimum positive period of the periodic term are determined; the standard deviation and mean value of all data points in the residual term are obtained; and the vector consisting of the slope, intercept, minimum positive period, standard deviation and mean value is used as the change vector of the water pressure data.

[0047] Specifically, for water pressure data under any water flow rate, the seasonal and trend decomposition using Loess (STL) algorithm can be used to decompose the water pressure data to obtain the trend term, periodic term and residual term of the water pressure data, and obtain the trend term, periodic term and residual term of the water pressure data corresponding to each water flow rate. Then, the trend term is fitted by the least squares method to obtain the fitting line corresponding to the trend term and the slope of the fitting line. and the intercept . Then obtain the minimum positive period of the periodic term , and get the standard deviation of all data points in the residual term and average .

[0048] Vector As the change vector of water pressure data.

[0049] Furthermore, when determining the characteristic parameters of a water conservancy project pipeline, as an optional embodiment of the present invention, the first difference between the cosine similarities of the change vectors of the water pressure data under any two adjacent water flow rates is calculated; the first differences are superimposed to obtain the characteristic parameters of the water conservancy project pipeline.

[0050] Specifically, the characteristic parameters are analyzed by the decomposition results of the water pressure data, based on the overall change trend of the water pressure data under all water flow rates, the periodic characteristics, and the correlation between the discrete characteristics, to further describe the fluid dynamic characteristics of the water body in the water conservancy project pipeline, and the numerical value of the characteristic parameters reflects the change trend of the water pressure data after the water hammer effect occurs in the water conservancy project pipeline as the water flow rate in the water conservancy project pipeline gradually increases. Since the change of the water pressure data is related to the dynamic response of the water conservancy project pipeline to the water hammer effect, the larger the numerical value of the characteristic parameter, the greater the impact of the water hammer effect on the water conservancy project pipeline. Among them, the embodiment of the present invention uses the following formula to calculate the characteristic parameters of the water conservancy project pipeline:

[0051]

[0052] In the above formula, Represents the characteristic parameters of water conservancy project pipelines. Indicates The water flow rate of the size The cosine similarity between the change vectors of water pressure data under different water flow rates. Indicates The water flow rate of the size The cosine similarity of the change vector of water pressure data under different water flow rates. A quantity that indicates the flow rate of water in a water conservancy project pipeline.

[0053] Furthermore, when determining the water pressure parameters of a water conservancy project pipeline, as an optional embodiment of the present invention, first, the water pressure factor is used as the vertical axis of a two-dimensional rectangular coordinate system, and the water flow rate is used as the horizontal axis of the two-dimensional rectangular coordinate system, and the water pressure factors corresponding to all water flow rates are mapped to the two-dimensional rectangular coordinate system to obtain multiple discrete points; then, the least squares method is used to perform curve fitting on each discrete point to obtain a water pressure factor curve, and the water flow rate corresponding to the data point with the largest curvature value in the water pressure factor curve is determined to be the damage value; then, linear fitting is performed on the two curve segments before and after the damage value to obtain a first straight line and a second straight line; secondly, the first slope of the first straight line and the second slope of the second straight line are obtained; and a first ratio of the second slope to the third sum of the first slope and the preset parameter is calculated; then, the second product between the water pressure factor under each water flow rate and the characteristic parameter of the water conservancy project pipeline is calculated, and each second product is superimposed to obtain a superimposed value; finally, the third product between the superimposed value and the first ratio is determined to be the water pressure parameter of the water conservancy project pipeline.

[0054] Specifically, the embodiment of the present invention constructs a two-dimensional rectangular coordinate system, takes the water pressure factor as the vertical axis of the two-dimensional rectangular coordinate system, takes the water flow rate as the horizontal axis of the two-dimensional rectangular coordinate system, and maps the water pressure factors under all water flow rates to the two-dimensional rectangular coordinate system to obtain a number of discrete points. The least squares method is used to perform curve fitting on all discrete points in the above two-dimensional rectangular coordinate system to obtain a water pressure factor curve, and obtain the water flow rate corresponding to the data point with the largest curvature value in the water pressure factor curve. , which is called the damage value.

[0055] For example, Figure 5 As shown, Figure 5 A schematic diagram of a water pressure factor curve is provided for one embodiment of the present invention. Figure 5 In the embodiment of the present invention, the first straight line z1 and the second straight line z2 are obtained by linear fitting the two curve segments before and after the data point with the largest curvature of the water pressure factor curve. The slopes of the first straight line z1 and the second straight line z2 are obtained. In the embodiment of the present invention, the slope of the first straight line z1 is recorded as And the slope of the second straight line z2 is recorded as .

[0056] Furthermore, when there is no abnormality or damage in the water conservancy project pipeline, as the water flow in the water conservancy project pipeline increases, the decay rate of the pressure in the water conservancy project pipeline gradually increases. However, when the water flow reaches a certain size and exceeds the bearing range of the water conservancy project pipeline, damage to the water conservancy project pipeline will cause the pressure in the water conservancy project pipeline to be released along the cracks or damage, resulting in a significant increase in the decay rate of the pressure wave in the water conservancy project pipeline compared to when it is not damaged. The greater the increase, the greater the degree of damage caused to the water conservancy project pipeline by the water hammer effect.

[0057] Furthermore, the water pressure parameter reflects the degree to which the water conservancy project pipeline is affected by the water hammer effect as the flow rate of water in the water conservancy project pipeline increases. The larger the water pressure parameter, the greater the degree to which the water conservancy project pipeline is affected by the water hammer effect. The more abnormal the water pressure change inside the water conservancy project pipeline, the higher the degree to which the water conservancy project pipeline is damaged by the water hammer effect. The embodiment of the present invention uses the following formula to calculate the water pressure parameter of the water conservancy project pipeline:

[0058]

[0059] In the above formula, Represents the water pressure parameters of the water conservancy project pipeline. A quantity that indicates the flow rate of water in a water conservancy project pipeline.

[0060] Represents the water pressure factor at the i-th water flow value. Represents a preset parameter to avoid the denominator being 0, and is preset to 0.1 based on experience. Represents the characteristic parameters of water conservancy project pipelines. Represents the first slope of the first straight line z1. Represents the second slope of the second straight line z2.

[0061] S103, determining ultrasonic parameters of the water conservancy project pipeline according to the ultrasonic detection data.

[0062] Among them, ultrasonic parameters characterize the defect information existing in the water conservancy project pipeline.

[0063] Specifically, ultrasound can detect and characterize the internal structure and mechanical properties of water conservancy pipelines, but the pressure wave oscillation of the water body in the water conservancy pipeline will affect the ultrasonic data, so the ultrasonic data should be processed to eliminate this influence. In addition, when the internal structure and mechanical properties of the water conservancy pipeline change, the frequency characteristics of the ultrasonic data will also change significantly, so the ultrasonic parameters are obtained by using the changes in the frequency characteristics of the ultrasonic data.

[0064] Furthermore, when determining the ultrasonic parameters of a water conservancy project pipeline, as an optional embodiment of the present invention, the ultrasonic detection data is first decomposed to obtain the IMF components of the ultrasonic detection data; then the ultrasonic detection data corresponding to the water flow rate less than the damage value is used as the initial ultrasonic data, and the ultrasonic detection data corresponding to the water flow rate greater than or equal to the damage value is used as the later ultrasonic data; then the Pearson correlation coefficient between the IMF components of the same layer between any initial ultrasonic data and any later ultrasonic data is calculated; secondly, all the Pearson correlation coefficients corresponding to each layer of the IMF components are counted, and the mean and standard deviation of all the Pearson correlation coefficients corresponding to each layer of the IMF components are calculated; and the second ratio of the mean to the standard deviation is calculated, and each second ratio is sorted in descending order; then the layers corresponding to the IMF components in the first n positions of the sort are selected and removed, and the IMF components of each remaining layer are inversely processed to obtain new ultrasonic data corresponding to each ultrasonic detection data, where n is a natural number greater than or equal to 1; finally, the new ultrasonic data under any adjacent water flow rate is used to determine the ultrasonic parameters of the water conservancy project pipeline.

[0065] Specifically, firstly, the ultrasonic detection data is subjected to empirical mode decomposition (EMD) to obtain the IMF components of each ultrasonic detection data. Figure 6 As shown, Figure 6 A schematic diagram of EMD decomposition of ultrasonic detection data provided by an embodiment of the present invention, Figure 6 It includes the original signal, that is, the original ultrasonic detection data, and also includes multiple IMF components after decomposition, which includes 8 layers of IMF components, namely Figure 6 Then the damage value will be less than The ultrasonic detection data corresponding to the water flow rate (i.e. the water flow rate corresponding to the data point with the largest curvature value in the water pressure factor curve mentioned above) is called the initial ultrasonic data and will be greater than or equal to the damage value. The ultrasonic detection data corresponding to the water flow is called the late ultrasonic data, and the Pearson correlation coefficient between the IMF components of the same layer between any initial ultrasonic data and any late ultrasonic data is obtained. Secondly, all the Pearson correlation coefficients corresponding to the IMF components of each layer are counted, and the mean of all the Pearson correlation coefficients corresponding to the IMF components of any layer is calculated. . And calculate the standard deviation of all Pearson correlation coefficients corresponding to the IMF components of any layer Get The largest front The layers corresponding to the IMF components are removed, and the inverse process of EMD decomposition is performed on the remaining IMF components to obtain new ultrasonic data corresponding to each ultrasonic detection data. Among them, n can be taken according to actual conditions, and the value is 2 in the embodiment of the present invention.

[0066] Furthermore, when determining the ultrasonic parameters of a water conservancy project pipeline, as an optional embodiment of the present invention, the new ultrasonic data is first Fourier transformed to obtain a spectrum diagram of the new ultrasonic data; then the number of peaks in the spectrum diagram of each new ultrasonic data is obtained; then the second difference between the number of peaks in the spectrum diagram of the new ultrasonic data under any adjacent water flow rates is calculated; finally, the second differences are superimposed to obtain the ultrasonic parameters of the water conservancy project pipeline.

[0067] Specifically, the new ultrasonic data is Fourier transformed to obtain a spectrum of each new ultrasonic data, the number of peaks in the spectrum of each new ultrasonic data is obtained, and the ultrasonic parameters of the pipeline are obtained according to the frequency characteristics of the ultrasonic data. The embodiment of the present invention specifically uses the following formula to calculate the ultrasonic parameters of the water conservancy project pipeline:

[0068]

[0069] In the above formula, Represents the ultrasonic parameters of water conservancy project pipelines. Indicates The number of peaks in the spectrum graph of the new ultrasonic data corresponding to the water flow rate. Indicates The number of peaks in the spectrum graph of the new ultrasonic data corresponding to the water flow rate. A quantity that indicates the water flow rate in a water conservancy project pipeline.

[0070] The embodiment of the present invention eliminates the influence of pressure wave oscillation in the pipeline on the pipeline by constructing new ultrasonic data, and the acquired ultrasonic parameters reflect the number and degree of cracks in the water conservancy project pipeline during the monitoring of the water conservancy project pipeline using ultrasonic sensors.

[0071] S104, determining the load parameter of the water conservancy project pipeline based on the water pressure parameter, the ultrasonic parameter and the damage value of the water conservancy project pipeline.

[0072] Specifically, by analyzing the water pressure data, we can explain the disturbances in the fluid movement. Abnormal pressure fluctuations may indicate blockage, leakage or other defects in the water conservancy project pipeline. By analyzing the ultrasonic signal, we can further identify the defects in the water conservancy project pipeline. It can be seen that the water pressure data and ultrasonic signals are based on different physical phenomena (fluid mechanics and acoustics), respectively, and provide multi-dimensional information about the quality of the water conservancy project pipeline. Combining the corresponding characteristics of the two can provide a more comprehensive understanding of the status of the water conservancy project pipeline.

[0073] Furthermore, the load parameter reflects the data characteristics of the dynamic response and defect changes of the hydraulic engineering pipeline revealed by the water pressure data and the ultrasonic detection data, respectively, to reflect the ability of the hydraulic engineering pipeline to withstand the destructive effect of the water hammer effect. The stronger the ability of the hydraulic engineering pipeline to withstand the water hammer effect, the higher the quality of the hydraulic engineering pipeline. When determining the load parameter of the hydraulic engineering pipeline, as an optional embodiment of the present invention, firstly calculate the fourth product between the water pressure parameter and the ultrasonic parameter, and the third ratio between the damage value and the fourth product; then use the normalization function to normalize the third ratio to obtain a normalized result; finally determine that the third difference between the fifth product between the predetermined coefficient and the normalized result and the predetermined value is the load parameter of the hydraulic engineering pipeline.

[0074] Specifically, the predetermined coefficient and the predetermined value can be determined according to actual conditions. In the embodiment of the present invention, the predetermined coefficient is set to 2, and the predetermined value is set to 1. The embodiment of the present invention uses the following formula to calculate the load parameters of the water conservancy project pipeline:

[0075]

[0076] In the above formula, Represents the load parameters of water conservancy project pipelines. Represents the water pressure parameters of the water conservancy project pipeline. Represents the ultrasonic parameters of water conservancy project pipelines. Represents the sigmoid normalization function, which is used for Perform normalization. Indicates the damage value.

[0077] S105, determining the quality grade of the water conservancy project pipeline corresponding to the load parameter according to the corresponding relationship between the preset load parameter and the quality grade of the water conservancy project pipeline.

[0078] Specifically, the corresponding relationship between the preset load parameters and the quality grade of the water conservancy project pipeline in the embodiment of the present invention is shown in Table 1 below:

[0079] Table 1 Correspondence between preset load parameters and quality grades of water conservancy project pipelines

[0080]

[0081] Furthermore, after determining the load parameter of the water conservancy project pipeline, the interval range of the load parameter is found from the above-mentioned correspondence table, and the quality grade corresponding to the corresponding interval range is determined as the quality grade of the water conservancy project pipeline to be tested. If the load parameter of the water conservancy project pipeline is 0.7, the quality grade of the water conservancy project pipeline is good. The design of the water conservancy project pipeline is improved with reference to the division results to improve its ability to resist water hammer and other risks, thereby effectively improving the management level of the water conservancy project pipeline, reducing the occurrence rate of failures, and ensuring the safe and stable operation of the water supply system.

[0082] The embodiment of the present invention can accurately reflect the state of the water conservancy project pipeline under dynamic load by monitoring the pressure fluctuation inside the pipeline caused by the water hammer effect, thereby revealing the potential quality defects of the water conservancy project pipeline. Therefore, by using the water hammer effect in combination with the water pressure data inside the water conservancy project and the ultrasonic detection data of the pipeline wall, it is not only possible to improve the accuracy, reliability and real-time performance of the quality detection of the water conservancy project pipeline, but also to effectively identify the defects and changes inside the water conservancy project pipeline, further improving the stability and safety of the water conservancy project.

[0083] Embodiment 2:

[0084] Corresponding to the quality inspection method for water conservancy project pipelines provided in the above embodiment, based on the same technical concept, an embodiment of the present invention further provides a quality inspection system for water conservancy project pipelines, which is used to execute the above quality inspection method for water conservancy project pipelines. Figure 7 A schematic diagram of a quality inspection system for water conservancy project pipelines provided by an embodiment of the present invention is shown in FIG. Figure 7 The quality inspection system for water conservancy project pipelines may have relatively large differences due to different configurations or performances, and may include one or more processors 701 and memory 702, the memory 702 is used to store computer programs that can be run on the processor 701, and the processor 701 is used to execute the program stored in the memory 702 to achieve the above Figure 1 The memory 702 may be a temporary storage or a permanent storage. The application stored in the memory 702 may include one or more modules (not shown in the figure), each of which may include a series of computer executable instructions for the quality inspection system for water conservancy project pipelines.

[0085] Furthermore, the processor 701 can be configured to communicate with the memory 702, and execute a series of computer executable instructions in the memory 702 on the quality inspection system for water conservancy engineering pipelines. The quality inspection system for water conservancy engineering pipelines can also include one or more power supplies 703, one or more wired or wireless network interfaces 704, one or more input and output interfaces 705, and one or more keyboards 706.

[0086] Specifically in this embodiment, the quality inspection system for water conservancy project pipelines includes a processor, a communication interface, a memory and a communication bus; wherein the processor, the communication interface and the memory communicate with each other through the bus; the memory is used to store computer programs; the processor is used to execute the programs stored in the memory to achieve the above Figure 1 The various steps in the method embodiment are similar to those in the method embodiment, and have the beneficial effects of the above method embodiments. To avoid repetition, the embodiments of the present invention will not be described in detail here.

[0087] It should be noted that the quality inspection system for water conservancy project pipelines provided in the embodiment of the present invention and the quality inspection method for water conservancy project pipelines provided in the embodiment of the present invention are based on the same application concept. Therefore, the specific implementation of this embodiment can refer to the implementation of the aforementioned quality inspection method for water conservancy project pipelines, and has the same or similar beneficial effects, and the repeated parts will not be repeated.

[0088] It should be noted that the sequence of the above embodiments of the present invention is only for description and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0089] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

Claims

1. A quality inspection method for water conservancy project pipelines, characterized in that: The quality inspection method for water conservancy project pipelines includes: Acquire water pressure data inside the water conservancy project pipeline to be detected and ultrasonic detection data of the pipeline wall, wherein the water pressure data and the ultrasonic detection data are measured when the water conservancy project pipeline has a water hammer effect at different water flow rates; Determine the water pressure parameter of the water conservancy project pipeline according to the water pressure data at different water flow rates, wherein the water pressure parameter represents the degree to which the quality of the water conservancy project pipeline is affected by the water hammer effect; Determine ultrasonic parameters of the water conservancy project pipeline according to the ultrasonic detection data, wherein the ultrasonic parameters represent defect information existing in the water conservancy project pipeline; Determining a load parameter of the water conservancy project pipeline based on the water pressure parameter, the ultrasonic parameter and the damage value of the water conservancy project pipeline; Determining the quality grade of the water conservancy project pipeline corresponding to the load parameter according to the corresponding relationship between the preset load parameter and the quality grade of the water conservancy project pipeline; Among them, determining the water pressure parameters of the water conservancy project pipeline according to the water pressure data under different water flow rates includes: determining the upper envelope and the lower envelope of the water pressure data under any water flow rate; performing curve fitting on the upper envelope and the lower envelope respectively to obtain an upper attenuation function corresponding to the upper envelope and a lower attenuation function corresponding to the lower envelope; determining the value of the undetermined coefficient according to the upper attenuation function and the lower attenuation function; determining the water pressure factor under different water flow rates using the value of the undetermined coefficient, the sign parameter corresponding to the undetermined coefficient and the preset parameter; decomposing the water pressure data under each flow rate to obtain the trend term, the periodic term and the residual term of the water pressure data; determining the change vector of the water pressure data according to the trend term, the periodic term and the residual term; determining the characteristic parameters of the water conservancy project pipeline according to the cosine similarity between the change vectors of the water pressure data under adjacent water flow rates; determining the water pressure parameters of the water conservancy project pipeline using the water pressure factor and the characteristic parameters under different water flow rates.

2. The quality inspection method for water conservancy project pipelines according to claim 1 is characterized in that: The method of determining the water pressure factor under different water flow rates by using the value of the undetermined coefficient, the sign parameter corresponding to the undetermined coefficient and the preset parameter includes: Calculate a first product of the numerical value of any of the undetermined coefficients in the lower attenuation function under any water flow rate and the sign parameter, and calculate an absolute value of a first sum between the numerical value of any of the undetermined coefficients in the upper attenuation function and the first product; Determine the absolute value of the first sum and the reciprocal of a second sum of a preset parameter; The superposition value of the inverse of the second sum value corresponding to each of the unknown coefficients is determined as the water pressure factor under the arbitrary water flow rate.

3. The quality inspection method for water conservancy project pipelines according to claim 1 is characterized in that: Determining the change vector of the water pressure data according to the trend term, the period term and the residual term comprises: Performing straight line fitting on the trend item using the least square method to obtain a fitting straight line; Determining the slope and intercept of the fitted straight line and the minimum positive period of the periodic term; Obtaining the standard deviation and mean value of all data points in the residual term; A vector consisting of the slope, the intercept, the minimum positive period, the standard deviation and the average value is used as a change vector of the water pressure data.

4. The quality inspection method for water conservancy project pipelines according to claim 1 is characterized in that: The method of determining the characteristic parameters of the water conservancy project pipeline according to the cosine similarity between the change vectors of the water pressure data under adjacent water flow rates includes: Calculate the first difference between the cosine similarities between the change vectors of the water pressure data under any two adjacent water flow rates; The first differences are superimposed to obtain characteristic parameters of the water conservancy project pipeline.

5. The quality inspection method for water conservancy project pipelines according to claim 1 is characterized in that: Determining the water pressure parameters of the water conservancy project pipeline by using the water pressure factors and the characteristic parameters under different water flow rates includes: Taking the water pressure factor as the vertical axis of a two-dimensional rectangular coordinate system and the water flow rate as the horizontal axis of the two-dimensional rectangular coordinate system, mapping the water pressure factors corresponding to all water flows to the two-dimensional rectangular coordinate system to obtain a plurality of discrete points; Using the least square method to perform curve fitting on each of the discrete points to obtain a water pressure factor curve, and determining the water flow corresponding to the data point with the largest curvature value in the water pressure factor curve as the damage value; Perform straight line fitting on the two curve segments before and after the damage value to obtain a first straight line and a second straight line; Obtaining a first slope of the first straight line and a second slope of the second straight line; Calculating a first ratio of the second slope to a third sum of the first slope and a preset parameter; Calculating the second product between the water pressure factor at each water flow rate and the characteristic parameter of the water conservancy project pipeline, and superimposing each of the second products to obtain a superimposed value; A third product between the superposition value and the first ratio is determined as a water pressure parameter of the water conservancy project pipeline.

6. The quality inspection method for water conservancy project pipelines according to claim 1 is characterized in that: Determining the ultrasonic parameters of the water conservancy project pipeline according to the ultrasonic detection data includes: Decomposing the ultrasonic detection data to obtain IMF components of the ultrasonic detection data; Using ultrasonic detection data corresponding to a water flow rate less than a damage value as initial ultrasonic data, and using ultrasonic detection data corresponding to a water flow rate greater than or equal to the damage value as later ultrasonic data; Calculating the Pearson correlation coefficient between the IMF components of the same layer between any of the initial ultrasonic data and any of the later ultrasonic data; Count all Pearson correlation coefficients corresponding to each layer of IMF components, and calculate the mean and standard deviation of all Pearson correlation coefficients corresponding to each layer of IMF components; Calculating a second ratio of the mean to the standard deviation, and sorting each of the second ratios in descending order; Select the layers corresponding to the first n IMF components to remove them, perform inverse processing on the remaining IMF components of each layer, and obtain new ultrasonic data corresponding to each ultrasonic detection data, where n is a natural number greater than or equal to 1; The ultrasonic parameters of the water conservancy project pipeline are determined by using the new ultrasonic data under any adjacent water flow rates.

7. The quality inspection method for water conservancy project pipelines according to claim 6 is characterized in that: The method of determining the ultrasonic parameters of the water conservancy project pipeline by using the new ultrasonic data under any adjacent water flow rate comprises: Performing Fourier transform on the new ultrasonic data to obtain a frequency spectrum of the new ultrasonic data; Get the number of peaks in the spectrum graph of each new ultrasonic data; Calculate a second difference between the numbers of peaks in the frequency spectrum of new ultrasonic data under any adjacent water flow rates; The second differences are superimposed to obtain the ultrasonic parameters of the water conservancy project pipeline.

8. The quality inspection method for water conservancy project pipelines according to any one of claims 1 to 7, characterized in that: The step of determining the load parameter of the water conservancy project pipeline based on the water pressure parameter, the ultrasonic parameter and the damage value of the water conservancy project pipeline comprises: calculating a fourth product between the water pressure parameter and the ultrasonic parameter, and a third ratio between the damage value and the fourth product; Using a normalization function to normalize the third ratio to obtain a normalized result; Determine a third difference between a fifth product of a predetermined coefficient and the normalized result and a predetermined value as a load parameter of the water conservancy project pipeline.

9. A quality inspection system for water conservancy project pipelines, characterized in that: The quality inspection system for water conservancy project pipelines includes: a processor and a memory; wherein the memory is used to store a computer program that can be run on the processor; the processor is used to execute the program stored in the memory to implement the steps of the quality inspection method for water conservancy project pipelines as described in any one of claims 1-8.

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