A method for detecting and locating leaks in a water conveyance pipeline

Abstract

The present invention discloses a method for detecting and locating leaks in a water conveyance pipeline, which relates to the technical field of leak detection in water conveyance pipelines. The main solution is as follows: acoustic parameters, pressure parameters, vibration parameters, electromagnetic signal parameters, conveying medium parameters, and external environment parameters are used to calculate a sound signal index, a pressure index, a vibration index, an electromagnetic index, and a medium index respectively. Then, a leakage comprehensive index is obtained and compared with a threshold value to determine whether there is a leak. After determining the leak, an environmental leakage value is calculated based on the external environment parameters and the leakage comprehensive index, and then compared with the threshold value to determine the location of the leak source, effectively improving the safety and reliability of pipeline operation and being applicable to the leak detection and location of various pipelines.

Description

Technical Field

[0001] The present invention relates to the technical field of water pipeline leakage detection, and specifically to a method for detecting and locating water pipeline leakage. Background Art

[0002] At present, with the wide application of pipeline transportation systems, pipeline leakage problems have become a major challenge in the industry. For pipelines used in industry to transport various liquids, once leakage occurs, it will lead to adverse consequences such as energy waste, economic losses, environmental pollution, and potential safety hazards, seriously affecting the stability and sustainable development of pipeline transportation. Therefore, the research and development of accurate and efficient pipeline leakage detection technology is extremely urgent.

[0003] Existing pipeline leakage detection technologies attempt to solve this problem based on different principles. For example, some pressure monitoring-based methods install pressure sensors on the pipeline to continuously monitor the change of the internal pressure of the pipeline. During normal operation, the pressure inside the pipeline is in a relatively stable state. When leakage occurs, the pressure will drop accordingly, and the system determines whether leakage has occurred based on a preset pressure threshold or pressure change rate. There are also flow monitoring-based technologies that infer possible leakage situations when the difference between the inlet and outlet flows of the pipeline exceeds the normal range.

[0004] However, the existing technologies still have obvious defects. Although the pressure monitoring-based methods can detect relatively large leaks to a certain extent, they are often not sensitive enough to small leaks because the pressure changes caused by small leaks are very subtle and may be misjudged as normal pressure fluctuations by the system, resulting in missed detections. Moreover, the pressure is easily interfered by various factors, such as the temperature change of the medium inside the pipeline, and these interference factors will reduce the detection accuracy. The flow monitoring-based technologies also face accuracy problems. In actual operation, there are certain errors in the measurement of the flow rate itself. When the leakage amount is small, it is difficult to accurately identify the leakage signal from the normal flow fluctuations. In addition, most of these traditional technologies are single-parameter detection methods and cannot comprehensively consider various complex situations in pipeline operation, making it difficult to meet the requirements of modern pipeline transportation for high-precision, high-reliability, and high-adaptability leakage detection. Summary of the Invention

[0005] (I) Technical Problems to be Solved

[0006] In view of the deficiencies of the prior art, the present invention provides a method for detecting and locating leaks in a water conveyance pipeline. By collecting various parameters such as acoustic, pressure, vibration, electromagnetic signals, the conveyed medium, and the external environment, and calculating corresponding indices based on these parameters respectively, a comprehensive leakage index is then obtained to determine whether there is a leak, and after determining the leak, the environmental leakage value is calculated in combination with the external environment parameters to determine the location of the leak source, solving the problems of low detection efficiency, poor accuracy, inability to monitor in real time, and difficulty in accurately locating the leak source in traditional pipeline leak detection technologies, improving the efficiency, accuracy, and reliability of pipeline leak detection, and reducing the risks of resource waste, environmental pollution, and safety accidents.

[0007] (2) Technical solutions

[0008] To achieve the above objectives, the present invention is realized through the following technical solutions: A method for detecting and locating leaks in a water conveyance pipeline, including:

[0009] Collect acoustic parameters, pressure parameters, vibration parameters, electromagnetic signal parameters, and conveyed medium parameters of different water conveyance pipelines.

[0010] Calculate the sound signal index SI according to the acoustic parameters; calculate the pressure index PI according to the pressure parameters; calculate the vibration index VII according to the vibration parameters; calculate the electromagnetic index according to the electromagnetic signal parameters; calculate the medium index MI according to the conveyed medium parameters; calculate the comprehensive leakage index CI according to the pressure index PI, the sound signal index SI, the vibration index VII, and the medium index MI; set the comprehensive leakage index threshold JV; judge whether the water conveyance pipeline leaks according to the comparison result between the comprehensive leakage index CI and the comprehensive leakage index threshold JV.

[0011] After determining that the water conveyance pipeline leaks, set several monitoring points on the laying path of this water conveyance pipeline, obtain the external environment parameters of different monitoring points, calculate the environmental leakage value EI of different monitoring points according to the external environment parameters and the comprehensive leakage index CI; set the environmental leakage index threshold GV, compare the environmental leakage value EI of different monitoring points with the environmental leakage value threshold GV, and judge the location of the leak source according to the comparison result.

[0012] In a preferred embodiment of the above method for detecting and locating leaks in a water conveyance pipeline: The specific steps for calculating the sound signal index SI are:

[0013] The acoustic parameters include the sound decibel value ES, the sound signal frequency FS, and the sound signal time characteristic value TS;

[0014] Calculate the sound signal index SI according to the sound decibel value ES, the sound signal frequency FS, and the sound signal time characteristic value TS, and the specific formula is as follows:

[0015]

[0016] Among them, represents the weight coefficient of the sound decibel value ES, and its value is 0.1 ≤ ≤ 0.4, represents the weight coefficient of the sound signal frequency FS, and its value is 0.2 ≤ ≤ 0.5, represents the weight coefficient of the time feature value TS of the sound signal, and its value is 0.3 ≤ ≤ 0.4, and + + = 1.

[0017] In the preferred scheme of the above-mentioned method for detecting and locating water pipeline leakage: The specific steps for calculating the pressure index PI are as follows:

[0018] The pressure parameters include the pressure measurement value , the average pressure value , the pressure fluctuation value and the time interval ;

[0019] According to the pressure measurement value , the average pressure value , the pressure fluctuation value and the time interval , calculate the pressure index PI, and the specific formula is as follows:

[0020]

[0021] Among them, represents the real-time pressure value at the i-th time point, represents the time interval between two adjacent pressure measurements, i represents the ordinal number of the real-time pressure value, and its value is [1, n], and n represents the total number of pressure values.

[0022] In the preferred scheme of the above-mentioned method for detecting and locating water pipeline leakage: The specific steps for calculating the vibration index VII are as follows:

[0023] The vibration parameters include the vibration amplitude A(t1), the vibration frequency F(t1) and the vibration time ;

[0024] According to the vibration amplitude A(t1), the vibration frequency F(t1) and the vibration time , calculate the vibration index VII, and the specific formula is as follows:

[0025]

[0026] Among them, t1 represents the vibration time One of the time points therein.

[0027] In a preferred embodiment of the above-mentioned method for detecting and locating leakage of a water conveyance pipeline: The specific steps for calculating the electromagnetic index EMII are as follows:

[0028] The electromagnetic signal parameters include the electric field strength E(t2), the magnetic field strength H(t2), the electromagnetic wave change frequency f(t2), and the observation time .

[0029] The electromagnetic index EMII is calculated based on the electromagnetic signal parameters, and the specific formula is as follows:

[0030]

[0031] where t2 is one of the time points in the observation time One of the time points therein.

[0032] In a preferred embodiment of the above-mentioned method for detecting and locating leakage of a water conveyance pipeline: The specific steps for calculating the medium index MI are as follows:

[0033] The conveying medium parameters include the conveying medium parameters including the medium density , the medium viscosity , the flow velocity deviation value V, the flow velocity value V0, the maximum density , the maximum viscosity , and the maximum flow velocity deviation value ;

[0034] Based on the medium density , the medium viscosity , the flow velocity deviation value V, the flow velocity value V0, the maximum density , the maximum viscosity , and the maximum flow velocity deviation value , the medium index MI is calculated, and the specific formula is as follows:

[0035]

[0036] where C represents the corrosion factor, and the value range is [0,1], represents the maximum amplitude factor value.

[0037] In a preferred embodiment of the above-mentioned method for detecting and locating leakage of a water conveyance pipeline: The specific steps for calculating the leakage comprehensive index CI are as follows:

[0038] Based on the pressure influence index PI, the sound signal influence index SI, the vibration influence index VII, the electromagnetic index EMII, and the medium influence index MI, the leakage comprehensive index CI is calculated, and the specific formula is as follows:

[0039]

[0040] Among them, is the influencing factor of the pressure index PI, and its value is 0.1 ≤ ≤ 0.3, is the influencing factor of the vibration index VII, and its value is 0.2 ≤ ≤ 0.4, is the influencing factor of the sound signal index SI, and its value is 0.3 ≤ ≤ 0.4, is the influencing factor of the medium index MI, and its value is 0.1 < ≤ 0.3, is the influencing factor of the electromagnetic index EMII, and its value is 0.1 ≤ ≤ 0.2, and + + + + = 1.

[0041] In the preferred scheme of the above-mentioned method for detecting and locating water pipeline leakage: The specific steps for judging whether the conveying pipeline leaks are as follows:

[0042] Set the leakage comprehensive index threshold JV;

[0043] When the leakage comprehensive index CI ≥ the leakage comprehensive index threshold JV, it is judged that the water pipeline leaks;

[0044] When the leakage comprehensive index CI < the leakage comprehensive index threshold JV, it is judged that the water pipeline is normal without leakage.

[0045] In the preferred scheme of the above-mentioned method for detecting and locating water pipeline leakage: The specific steps for calculating the environmental leakage value EI are as follows:

[0046] The external environmental parameters include the humidity value W, the temperature value Tc, and the soil pH value Vbb;

[0047] According to the external environmental parameters and the leakage comprehensive index CI, calculate the environmental leakage value EI, and the specific formula is as follows:

[0048]

[0049] Among them, c1 is the weight coefficient of the humidity value W, and its value is 0.1 ≤ c1 ≤ 0.3, c2 is the weight coefficient of the temperature value Tc, and its value is 0.2 ≤ c2 ≤ 0.4, c3 is the weight coefficient of the soil pH value H, and its value is 0.3 ≤ c3 ≤ 0.5, and c1 + c2 + c3 = 1.

[0050] In the preferred scheme of the above-mentioned method for detecting and locating water pipeline leakage: The specific steps for calculating the leakage source location are as follows:

[0051] Compare the environmental leakage value EI at different monitoring points with the environmental leakage value threshold GV;

[0052] If the environmental leakage index EI ≥ the environmental leakage index threshold GV, determine that the corresponding monitoring point is the pipeline leakage location;

[0053] If the environmental leakage index EI < the environmental leakage index threshold GV, determine that there is no pipeline leakage at the corresponding monitoring point.

[0054] (III) Beneficial effects

[0055] The present invention provides a method for detecting and locating leakage of a water conveyance pipeline, having the following beneficial effects:

[0056] (1) By collecting multi-dimensional parameters such as acoustic, pressure, vibration, electromagnetic signals, conveying medium, and external environment, the operating state information of the pipeline can be obtained comprehensively, providing a rich data basis for subsequent accurate detection, improving the reliability and accuracy of detection, and avoiding the limitations of single-parameter detection.

[0057] (2) Calculate the pressure index PI, sound signal index SI, vibration index VII, and medium index MI, and convert the parameter data into intuitive and comparable indicators, which helps to analyze the pipeline condition more efficiently and highlight the contribution of each parameter to the pipeline state assessment.

[0058] (3) Calculate the leakage comprehensive index CI according to the pressure index PI, sound signal index SI, vibration index VII, and medium index MI. By comparing the leakage comprehensive index CI with the leakage comprehensive index threshold JV, it can be judged whether the conveying pipeline leaks, and by comparing with the threshold, it can comprehensively and comprehensively evaluate whether the pipeline leaks, reduce the possibility of misjudgment and missed judgment, timely discover potential safety hazards, and ensure the safety and stability of pipeline transportation.

[0059] (4) After determining the leakage, set monitoring points to calculate the environmental leakage value, and compare it with the threshold to judge the leakage source location, which can quickly locate the leakage point, greatly shorten the repair time and cost, reduce resource waste, environmental pollution, and possible safety accidents caused by leakage, and improve the efficiency and benefit of pipeline operation and maintenance. Description of the drawings

[0060] Figure 1 It is a schematic flow chart of a method for detecting and locating leakage of a water conveyance pipeline according to the present invention. Detailed implementation manners

[0061] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0062] Please refer to Figure 1 , the present invention provides a method for detecting and locating water pipeline leakage, including:

[0063] Step 1: Collect acoustic parameters, pressure parameters, vibration parameters, electromagnetic signal parameters, and conveying medium parameters of different conveying pipelines.

[0064] Step 2: Calculate the sound signal index SI according to the acoustic parameters; calculate the pressure index PI according to the pressure parameters; calculate the vibration index VII according to the vibration parameters; calculate the electromagnetic index EMII according to the electromagnetic signal parameters; calculate the medium index MI according to the conveying medium parameters; calculate the leakage comprehensive index CI according to the pressure index PI, the sound signal index SI, the vibration index VII, the electromagnetic index EMII, and the medium index MI; set the leakage comprehensive index threshold JV; judge whether the conveying pipeline leaks according to the comparison result between the leakage comprehensive index CI and the leakage comprehensive index threshold JV.

[0065] Step 201: The specific steps for calculating the sound signal index SI are as follows:

[0066] The acoustic parameters include the sound decibel value ES, the sound signal frequency FS, and the sound signal time characteristic value TS.

[0067] It should be noted that the sound decibel value ES represents the intensity of the sound signal of the water pipeline and can be obtained by a sound level meter, and the measurement unit is usually decibels.

[0068] The sound signal frequency FS refers to the number of vibrations of the sound signal in the water pipeline per unit time and can be obtained by a sound analyzer.

[0069] The sound signal time characteristic value TS refers to the comprehensive value of the characteristics of the sound signal in the time dimension. The sound duration, the moment when the sound appears, and the interval time of the sound signal can be obtained by an audio analyzer. The measurement unit is seconds. Multiply these three values by their respective weight coefficients and sum them to obtain the sound signal time characteristic value TS. For example, the sound duration is multiplied by the weight coefficient α1, the moment when the sound appears is multiplied by the weight coefficient α2, and the interval time of the sound signal is multiplied by the weight coefficient α3, and the sum is the sound signal time characteristic value T; among them, α1 takes a value of 0.1 < α1 < 0.4, α2 takes a value of 0.2 < α2 < 0.5, α3 takes a value of 0.3 < α3 < 0.4, and α1 + α2 + α3 = 1.

[0070] Calculate the sound signal index SI based on the sound decibel value ES, the sound signal frequency FS, and the sound signal time characteristic value TS. The specific formula is as follows:

[0071]

[0072] Wherein, represents the weight coefficient of the sound decibel value ES, and the value range is 0.1 ≤ ≤ 0.4, represents the weight coefficient of the sound signal frequency FS, and the value range is 0.2 ≤ ≤ 0.5, represents the weight coefficient of the sound signal time characteristic value TS, and the value range is 0.3 ≤ ≤ 0.4, and + + = 1.

[0073] It should be noted that the calculated sound signal index SI can be used for subsequent operations such as judging whether the pipeline leaks. By comprehensively considering the energy, frequency, and time characteristics of the sound signal and calculating according to its weight coefficient, it can more comprehensively reflect the characteristics of the sound signal, thereby improving the accuracy of pipeline leak detection.

[0074] This formula comprehensively considers the sound decibel value ES, the sound signal frequency FS, and the sound signal time characteristic value TS. By assigning different weight coefficients to calculate the sound signal index, it can comprehensively capture multi-dimensional information of the sound signal, avoid the one-sidedness of single-parameter evaluation, and can accurately reflect the change of the pipeline acoustic state in pipeline leak detection, effectively improving the accuracy and reliability of leak judgment, providing a strong basis for timely discovering and handling pipeline leak problems, and ensuring the safe and stable operation of the pipeline transportation system.

[0075] Step 202: The specific steps for calculating the pressure index PI are as follows:

[0076] The pressure parameters include the pressure measurement value , the average pressure value , the pressure fluctuation value , and the time interval .

[0077] It should be noted that the pressure measurement value is obtained through a pressure sensor; the average pressure value is obtained by summing the pressure measurement values at different time points within the detection period and calculating the arithmetic mean; the pressure fluctuation value is the pressure measurement value at different time points in statistics to obtain the pressure measurement values for the maximum and minimum values, which are calculated by taking the difference; the time interval is determined by setting the sampling frequency of the pressure sensor. For example, if the pressure sensor collects pressure data every 1 second, then = 1 second.

[0078] Based on the pressure measurement values , the average pressure value , the pressure fluctuation value and the time interval , the pressure index PI is calculated. The specific formula is as follows:

[0079]

[0080] where represents the real-time pressure value at the i-th time point, represents the time interval between two adjacent pressure measurements, i represents the ordinal number of the real-time pressure value, with a value range of [1, n], and n represents the total number of pressure values.

[0081] It should be noted that for each pressure measurement value , first calculate , where the numerator represents the difference between the current pressure measurement value and the average pressure value, and this difference reflects the deviation of the current pressure from the average pressure. The denominator is the pressure fluctuation value. Dividing the pressure deviation value by the pressure fluctuation value gives a relative degree of pressure deviation, that is, the pressure deviation situation is normalized. Summing up all the measurement results and dividing by the total number of pressure values to calculate the average value integrates the data of multiple measurements, reduces the influence of single-measurement errors, can more accurately and stably reflect the pressure state of the system, helps to detect pressure anomalies in a timely manner, and ensures the safe operation of the relevant system; considering the time factor, and then dividing by the time interval, it reflects the overall situation of the relative fluctuation degree of the pipeline pressure deviating from the average pressure within a given time interval, and its role is to consider the speed of pressure change over time. If the time interval is small, it means that the pressure has changed in a short time, which makes the pressure index more sensitive to such rapid pressure changes.

[0082] is to sum up the above calculation results, that is, to accumulate the values considering the degree of pressure deviation and time factor obtained from each measurement. Finally, divide by the number of measurements n to obtain the average pressure index PI, which comprehensively reflects the degree of pressure deviation from the average pressure and the time characteristics of pressure change within a certain period of time.

[0083] By calculating , dividing the difference between the pressure measurement value and the average pressure value by the pressure fluctuation value can normalize the pressure deviation situation, providing a comparable standard among systems with different fluctuation characteristics. Multiply by Taking into account the time interval factor, it can respond reasonably to rapid or slow pressure changes, well reflecting the timeliness of pressure changes.

[0084] Step 203: The specific steps for calculating the vibration index VII are as follows:

[0085] Vibration parameters include vibration amplitude A, vibration frequency F, and vibration time .

[0086] It should be noted that the vibration amplitude A(t1) represents the amplitude of the water conveyance pipeline vibration at the time point (t1), and the vibration amplitudes at different time points within the detection period can be obtained through a vibration sensor.

[0087] The vibration frequency F(t1) reflects the vibration frequency of the water conveyance pipeline at the time point (t1), and the vibration frequencies at different time points within the detection period are obtained by performing a fast Fourier transform (FFT) on the collected vibration signals of the water conveyance pipeline.

[0088] Vibration time , that is, the duration for which the water conveyance pipeline vibrates. An acceleration sensor can be used to set a trigger condition. When the vibration acceleration exceeds a certain set value, data acquisition is triggered. When the trigger condition is met, data acquisition starts, and the start time is recorded simultaneously. When the vibration signal lasts for a period of time and the amplitude is lower than the trigger threshold or manual acquisition stops, the end time is recorded, thereby obtaining the vibration time .

[0089] Based on the vibration amplitude A(t1), vibration frequency F(t1), and vibration time , calculate the vibration index VII. The specific formula is as follows:

[0090]

[0091] where t1 represents one of the time points within the vibration time .

[0092] It should be noted that the integral operation is performed over the entire vibration time Inside, the square of the product of the vibration amplitude A(t1) and the vibration frequency F(t1) at each time point is cumulatively summed. Through integral operation, it can handle the situation where the amplitude and frequency change continuously over time, capture the subtle fluctuations at each moment, and then divide by the time, that is, find the average value of this cumulative quantity per unit time. This step is crucial as it avoids the evaluation deviation caused by different vibration durations, enabling the result to focus on the comprehensive intensity of vibration per unit time. Finally, taking the square root is to make the dimension of the vibration index consistent with the dimension of the product of the amplitude and frequency, and at the same time restore the numerical amplification effect caused by the square operation, making the vibration index more in line with the intuitive feeling and facilitating comparison with the actual engineering experience value.

[0093] This formula comprehensively covers the relationship among vibration amplitude, frequency, and time, can reflect the vibration condition in all aspects, and avoids the one-sidedness of single-parameter evaluation.

[0094] Step 204: The specific steps for calculating the electromagnetic index EMII are as follows:

[0095] The electromagnetic signal parameters include the electric field strength E, the magnetic field strength H, the electromagnetic wave change frequency f, and the observation time .

[0096] It should be noted that the electric field strength E(t2) refers to the electric field situation around the water conveyance pipeline at the time point t2, and the electric field strength E at different time points during the detection period can be measured by an electric field sensor. For example, if the pipeline conveys a fluid of charged particles, such as electroplating wastewater in the electroplating industry contains various metal ions, near the leakage point, due to the leakage of the fluid, the electric field distribution will change.

[0097] The magnetic field strength H(t2) refers to the magnetic field strength at the time point t2, and generally, the magnetic field strength H(t2) at different time points during the detection period can be obtained through a Hall effect sensor or a magnetoresistive sensor. If the pipeline conveys a fluid of charged particles, such as electroplating wastewater in the electroplating industry contains various metal ions, near the leakage point, the pipeline leakage will change the measured value of the magnetic field strength.

[0098] The electromagnetic wave change frequency f(t2) refers to the number of times the electromagnetic wave around the water conveyance pipeline completes periodic changes per unit time at the time point t2, and can be measured by a spectrum analyzer. For example, if the pipeline conveys a fluid of charged particles, such as electroplating wastewater in the electroplating industry contains various metal ions, near the leakage point, due to the pipeline leakage, the microwave frequency will change.

[0099] Observation time represents the total duration of the observation, and the unit is usually seconds. This period of time can be set as the period for analyzing the complete cycle of the electromagnetic signal, which limits the time range of the integral operation.

[0100] Calculate the electromagnetic index EMII based on electromagnetic signal parameters. The specific formula is as follows:

[0101]

[0102] where t2 is the observation time one of the time points in

[0103] It should be noted that this formula first calculates the integrals of the squares of the electric field strength, magnetic field strength, and electromagnetic wave frequency over time respectively, accumulates them, then divides by the total duration for normalization, and finally takes the square root, so that the electromagnetic index comprehensively reflects the overall change trend of the electric field, magnetic field, and frequency elements, and is numerically easier to interpret and compare, thereby evaluating the complexity of the electromagnetic environment or the comprehensive characteristics of the signal. If a pipeline leaks, it will cause changes in the surrounding electromagnetic environment. For example, the leaked liquid may change the conductivity of the surrounding medium, thereby affecting the electric field strength; or the physical changes caused by the leak may generate new electromagnetic interference sources, changing the magnetic field strength and the electromagnetic wave change frequency.

[0104] Taking into comprehensive consideration the electric field strength, magnetic field strength, and electromagnetic wave change frequency can comprehensively reflect the surrounding electromagnetic environment conditions. In pipeline leak detection, pipeline leaks may cause changes in the surrounding electromagnetic environment. For example, leaks may cause changes in the medium, affecting the electric field, or generating new interferences to change the magnetic field and frequency. The electromagnetic index obtained by this formula can be used as a sensitive indicator. Compared with traditional detection methods, it can detect electromagnetic anomalies caused by leaks earlier, improve the timeliness and accuracy of leak detection, effectively reduce the risk of pipeline leaks and subsequent losses, and ensure the safe and stable operation of the pipeline system.

[0105] Step 205: The specific steps for calculating the medium index MI are as follows:

[0106] The conveying medium parameters include the medium density , the medium viscosity and the flow velocity deviation value V.

[0107] It should be noted that the medium density refers to the mass of the medium per unit volume. Pipeline leaks will cause the medium to overflow from the pipeline, resulting in a decrease in the density of the medium inside the pipeline. The medium density is measured by a density meter installed in the pipeline and the maximum density of the medium density during the measurement period .

[0108] The medium viscosity It reflects the internal friction of the medium when flowing in the conveying pipeline. Pipeline leakage may lead to medium mixing or dilution, thus changing the viscosity of the medium. If the medium viscosity decreases, the internal friction decreases; if the medium viscosity increases, the internal friction increases. For example, if the leaked medium is a liquid, mixing air or other liquids may cause viscosity changes, and the viscosity of the medium can be directly obtained through a viscometer set in the pipeline. and the maximum viscosity of the medium during the measurement period .

[0109] The flow velocity deviation value V is the difference between the actual flow velocity and the standard flow velocity of the medium in the conveying pipeline. Pipeline leakage will cause a decrease in the medium flow rate, thus leading to an increase in the flow velocity. The flow velocity deviation value refers to the difference between the actual flow velocity and the expected flow velocity. The greater the difference, the more serious the flow velocity leakage situation. The flow velocity value V0 is measured by a flow velocity sensor set in the pipeline, and the difference is calculated based on the flow velocity value V0 and the flow velocity value measured last time to calculate the difference , obtaining the flow velocity deviation value V and the maximum flow velocity deviation value .

[0110] According to the medium density , medium viscosity , flow velocity deviation value V, maximum density , flow velocity value V0, maximum viscosity and the maximum flow velocity deviation value , calculate the medium index MI, and the specific formula is as follows:

[0111]

[0112] Among them, C represents the corrosivity factor, and its value ranges from [0, 1], represents the maximum amplitude factor value, and its value ranges from ≤1.

[0113] It should be noted that first calculate , which is a reference flow velocity here,

[0114] Multiply the medium density and the medium viscosity, then multiply by the corrosivity factor C, and then multiply by . This step takes into account the density and viscosity characteristics of the medium itself, the influence of the flow velocity deviation on the medium, and also considers the corrosivity factor.

[0115] Calculate , this step takes into account the most extreme situation.

[0116] Finally, divide the numerator by the denominator to obtain the medium index MI. This index can be used to evaluate a comprehensive indicator of the medium relative to the extreme situation under the current density, viscosity, and flow rate deviation. If it is close to 1, it indicates that the current medium situation is close to the extreme situation; if it is smaller, it indicates that the current medium situation is relatively better.

[0117] By comprehensively considering the medium density , the medium viscosity , the flow rate deviation value V, the maximum density , the maximum viscosity and the maximum flow rate deviation value , the medium condition can be comprehensively evaluated. Comparing the current medium situation with the extreme situation to obtain the medium index can intuitively reflect the state of the medium. This helps to predict risks in advance, such as corrosion risk and flow anomalies, in fields such as chemical engineering and fluid transportation, facilitating timely measures to ensure the stable operation of the system and effectively improving the service life and operation efficiency of the equipment.

[0118] Step 206: The specific steps for calculating the leakage comprehensive index CI are as follows:

[0119] Calculate the leakage comprehensive index CI based on the pressure influence index PI, the sound signal influence index SI, the vibration influence index VII, the electromagnetic index EMII, and the medium influence index MI. The specific formula is as follows:

[0120]

[0121] Among them, is the influence factor of the pressure index PI, and its value is 0.1 ≤ ≤ 0.3, is the influence factor of the vibration index VII, and its value is 0.2 ≤ ≤ 0.4, is the influence factor of the sound signal index SI, and its value is 0.3 ≤ ≤ 0.4, is the influence factor of the medium index MI, and its value is 0.1 < ≤ 0.3, is the influence factor of the electromagnetic index EMII, and its value is 0.1 ≤ ≤ 0.2, and + + + + = 1.

[0122] It should be noted that this formula comprehensively considers five important parameters: the pressure influence index PI, the sound signal influence index SI, the vibration influence index VII, and the medium influence index MI. Each parameter has a corresponding weight coefficient, indicating the degree of emphasis on different parameters when calculating the comprehensive index. By multiplying each parameter by its corresponding weight coefficient and then summing them up, a comprehensive index that can comprehensively reflect the leakage index CI is obtained.

[0123] This formula can avoid the limitations of single-factor evaluation and more accurately reflect whether there is a leakage risk in the system. The index value is intuitive, which is convenient for technicians to quickly judge the likelihood of leakage, and helps to take preventive or repair measures in a timely manner in fields such as chemical industry and energy, effectively reducing the probability of leakage accidents.

[0124] Step 207: The specific steps to determine whether the conveying pipeline is leaking are as follows:

[0125] Set the leakage comprehensive index threshold JV.

[0126] It should be noted that the threshold is determined by conducting simulated leakage experiments on the water conveyance pipeline in the laboratory. A water conveyance pipeline model can be constructed, and leakage situations of different degrees can be artificially created. The corresponding leakage comprehensive index is measured, and then an effective value for distinguishing leakage is determined based on the experimental data, that is, the leakage comprehensive index threshold JV is obtained.

[0127] When the leakage comprehensive index CI ≥ the leakage comprehensive index threshold JV, it is judged that the water conveyance pipeline is leaking.

[0128] When the leakage comprehensive index CI < the leakage comprehensive index threshold JV, it is judged that the water conveyance pipeline is normal without leakage.

[0129] It should be noted that this scheme determines the leakage comprehensive index threshold JV by conducting simulated leakage experiments on the water conveyance pipeline in the laboratory, constructs a water conveyance pipeline model, artificially creates leakage, and measures the corresponding leakage comprehensive index. During actual judgment, when the leakage comprehensive index CI ≥ the leakage comprehensive index threshold JV, it is determined that the water conveyance pipeline is leaking; when the leakage comprehensive index CI < the leakage comprehensive index threshold JV, it is determined that the water conveyance pipeline is normal without leakage.

[0130] The scheme determines the threshold through scientific experiments, making the judgment more accurate, being able to detect leakage situations in advance, reducing losses caused by pipeline leakage, ensuring the normal operation of the water conveyance system, and also facilitating maintenance personnel to conduct targeted inspections and repairs on pipelines that may leak.

[0131] Step 3: After determining the leakage of the conveying pipeline, set a number of monitoring points on the laying path of the conveying pipeline, obtain the external environmental parameters of different monitoring points, and calculate the environmental leakage value EI of different monitoring points according to the external environmental parameters and the leakage comprehensive index CI; set the environmental leakage index threshold GV, compare the environmental leakage value EI of different monitoring points with the environmental leakage value threshold GV, and judge the location of the leakage source according to the comparison result.

[0132] Step 301: The specific steps for calculating the environmental leakage value EI are as follows:

[0133] The external environmental parameters include the humidity value W, the temperature value Tc, and the soil acidity and alkalinity Vbb.

[0134] It should be noted that the analysis of the area around the leaking pipeline includes the humidity value W, the temperature value Tc, and the soil acidity and alkalinity Vbb; by collecting soil samples at the monitoring points and then analyzing the soil samples, the humidity value W, the temperature value Tc, and the soil acidity and alkalinity Vbb of the soil samples can be obtained, which can be obtained through devices such as humidity sensors, temperature sensors, and soil acidity and alkalinity testers.

[0135] According to the external environmental parameters and the leakage comprehensive index CI, the specific formula for calculating the environmental leakage value EI is as follows:

[0136]

[0137] Among them, c1 is the weight coefficient of the humidity value W, with a value range of 0.1 ≤ c1 ≤ 0.3, c2 is the weight coefficient of the temperature value Tc, with a value range of 0.2 ≤ c2 ≤ 0.4, c3 is the weight coefficient of the soil acidity and alkalinity H, with a value range of 0.3 ≤ c3 ≤ 0.5, and c1 + c2 + c3 = 1.

[0138] It should be noted that this formula comprehensively considers the external environmental parameters and the leakage comprehensive index CI. Each external environmental parameter has a corresponding weight coefficient, indicating the degree of emphasis on different parameters when calculating the comprehensive index. By multiplying each external environmental parameter by its corresponding weight coefficient and then summing, a comprehensive index that can comprehensively describe the environmental leakage value EI is obtained.

[0139] This formula comprehensively considers the influence of the humidity value W, the temperature value Tc, and the soil acidity and alkalinity H on the pipeline, and has many beneficial effects. It can comprehensively evaluate the environmental conditions of the pipeline, provide a scientific basis for pipeline maintenance. By quantifying the influence degree of each factor, it can accurately predict the risk of the pipeline being eroded or damaged by the environment, early warning of possible problems such as leakage, which helps to formulate targeted protection strategies, reduce maintenance costs, extend the service life of the pipeline, and ensure the safe and stable operation of the pipeline system.

[0140] Step 302: The specific steps for calculating the leakage source location are as follows:

[0141] Compare the environmental leakage value EI at different monitoring points with the environmental leakage value threshold GV.

[0142] It should be noted that the environmental leakage value threshold GV is obtained by collecting the environmental parameters around multiple non-leaking pipelines, calculating the environmental leakage index, and taking the average of all environmental leakage indices as the environmental leakage value threshold GV.

[0143] If the environmental leakage index EI ≥ the environmental leakage index threshold GV, it is determined that the corresponding monitoring point is the pipeline leakage location.

[0144] If the environmental leakage index EI < the environmental leakage index threshold GV, it is determined that there is no pipeline leakage at the corresponding monitoring point.

[0145] It should be noted that the solution calculates the environmental impact index EI and compares it with the threshold GV. If the environmental leakage index EI ≥ the environmental leakage index threshold GV, it is determined that there is a pipeline leakage risk caused by environmental factors; if the environmental leakage index EI < the environmental leakage index threshold GV, it is determined that the pipeline environment is safe. In this way, the monitoring and judgment of the leakage situation of the water conveyance pipeline caused by environmental factors are realized.

[0146] This solution can monitor the pipeline environment status in real time, comprehensively consider to improve the accuracy of leakage judgment, facilitate timely maintenance, reduce the occurrence of leakage accidents, ensure stable water conveyance, reduce water resource waste and economic losses caused by leakage, and extend the service life of the pipeline.

[0147] The above embodiments can be implemented in whole or in part by software, hardware, firmware or any other combination. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product. Those of ordinary skill in the art can realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution.

[0148] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0149] As described above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application.

Claims

1. A method for detecting and locating leakage in a water pipeline, characterized in that: include: Collect acoustic parameters, pressure parameters, vibration parameters, electromagnetic signal parameters and conveying medium parameters of different conveying pipelines; Calculate the sound signal index SI according to the acoustic parameters; calculate the pressure index PI according to the pressure parameters; calculate the vibration index VII according to the vibration parameters; calculate the electromagnetic index EMII according to the electromagnetic signal parameters; calculate the medium index MI according to the transmission medium parameters; calculate the leakage comprehensive index CI according to the pressure index PI, the sound signal index SI, the vibration index VII, the electromagnetic index EMII and the medium index MI; set the leakage comprehensive index threshold JV; judge whether the transmission pipeline is leaking according to the comparison result of the leakage comprehensive index CI and the leakage comprehensive index threshold JV; After confirming the pipeline leakage, several monitoring points are set on the laying path of the pipeline, and the external environmental parameters of different monitoring points are obtained. According to the external environmental parameters and the comprehensive leakage index CI, the environmental leakage values ​​EI of different monitoring points are calculated; the environmental leakage value threshold GV is set, and the environmental leakage values ​​EI of different monitoring points are compared with the environmental leakage value threshold GV, and the location of the leakage source is determined according to the comparison result; The formula for calculating the comprehensive leakage index CI is as follows: in, is the influencing factor of the pressure index PI, and its value is 0.1≤ ≤0.3, is the influence factor of vibration index VII, and its value is 0.2≤ ≤0.4, is the influence factor of the sound signal index SI, and its value is 0.3≤ ≤0.4, is the influence factor of medium index MI, with a value of 0.1< ≤0.3, is the impact factor of the electromagnetic index EMII, with a value of 0.1≤ ≤0.2, and + + + + =1; External environmental parameters include humidity value W, temperature value Tc and soil pH Vbb; The formula for calculating the environmental leakage value EI is as follows: Among them, c1 is the weight coefficient of humidity value W, and its value is 0.1≤c1≤0.3; c2 is the weight coefficient of temperature value Tc, and its value is 0.2≤c2≤0.4; c3 is the weight coefficient of soil pH Vbb, and its value is 0.3≤c3≤0.5, and c1+c2+c3=1.

2. A water pipeline leakage detection and positioning method according to claim 1, characterized in that: The specific steps for calculating the sound signal index SI are: The acoustic parameters include the sound decibel value ES, the sound signal frequency FS and the sound signal time characteristic value TS; The sound signal index SI is calculated based on the sound decibel value ES, the sound signal frequency FS and the sound signal time characteristic value TS. The specific formula is as follows: in, Represents the weight coefficient of the sound decibel value ES, with a value of 0.1≤ ≤0.4, Represents the weight coefficient of the sound signal frequency FS, with a value of 0.2≤ ≤0.5, Represents the weight coefficient of the time characteristic value TS of the sound signal, and the value is 0.3≤ ≤0.4, and + + =1.

3. A water pipeline leakage detection and positioning method according to claim 2, characterized in that: The specific steps for calculating the pressure index PI are: Pressure parameters include pressure measurements , average pressure value , pressure fluctuation value and time interval ; According to the pressure measurement , average pressure value , pressure fluctuation value and time interval , calculate the pressure index PI, the specific formula is as follows: in, represents the real-time pressure value at the i-th time point, Represents the time interval between two adjacent pressure measurements, i represents the ordinal number of the real-time pressure value, and its value is [1,n], and n represents the total number of pressure values.

4. A water pipeline leakage detection and positioning method according to claim 3, characterized in that: The specific steps for calculating the vibration index VII are: Vibration parameters include vibration amplitude A(t1), vibration frequency F(t1) and vibration time ; According to the vibration amplitude A(t1), vibration frequency F(t1) and vibration time , calculate the vibration index VII, based on the following specific formula: Where t1 represents the vibration time One of the time points in .

5. A water pipeline leakage detection and positioning method according to claim 4, characterized in that: The specific steps for calculating the electromagnetic index EMII are: The electromagnetic signal parameters include the electric field strength E(t2), the magnetic field strength H(t2), the electromagnetic wave change frequency f(t2) and the observation time ; The electromagnetic index EMII is calculated based on the electromagnetic signal parameters, and the specific formula is as follows: Where t2 is the observation time One of the time points in .

6. A water pipeline leakage detection and positioning method according to claim 5, characterized in that: The specific steps for calculating the medium index MI are: Conveying medium parameters include medium density , medium viscosity , velocity deviation value V, velocity value V0, maximum density , maximum viscosity And the maximum flow rate deviation ; According to the medium density , medium viscosity , velocity deviation value V, velocity value V0, maximum density , maximum viscosity And the maximum flow rate deviation , the specific formula for calculating the medium index MI is as follows: Where C represents the corrosive factor, and its value is [0,1]. Represents the maximum corrosive factor value.

7. A water pipeline leakage detection and positioning method according to claim 1, characterized in that: The specific steps to determine whether the pipeline is leaking are: When the leakage comprehensive index CI ≥ leakage comprehensive index threshold JV, it is judged that the water pipeline is leaking; When the comprehensive leakage index CI is less than the comprehensive leakage index threshold JV, it is judged that the water pipeline is normal and has no leakage.

8. A water pipeline leakage detection and positioning method according to claim 1, characterized in that: The specific steps to calculate the leak source location are: Compare the environmental leakage value EI at different monitoring points with the environmental leakage value threshold GV; If the environmental leakage value EI ≥ the environmental leakage value threshold GV, the corresponding monitoring point is determined to be the pipeline leakage location; If the environmental leakage value EI is less than the environmental leakage value threshold GV, it is determined that no pipeline leakage occurs at the corresponding monitoring point.

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