Water pipeline leakage detecting and positioning method

Abstract

The invention discloses a water conveying pipeline leakage detection positioning method, and relates to the technical field of water conveying pipeline leakage detection, and the main scheme is as follows: according to acoustic parameters, pressure parameters, vibration parameters, electromagnetic signal parameters, conveying medium parameters and external environment parameters, respectively calculating a sound signal index, a pressure index, a vibration index, an electromagnetic index and a medium index; and after leakage is determined, an environment leakage value is calculated according to the external environment parameters and the leakage comprehensive index, and then the environment leakage value is compared with the threshold value to judge the position of a leakage source, so that the safety and the reliability of pipeline operation are effectively improved, and the method is suitable for leakage detection and positioning of various pipelines.

Description

Technical Field

[0001] The present invention relates to the technical field of water pipeline leakage detection, and in particular to a water pipeline leakage detection and positioning method. Background Art

[0002] At a time when pipeline transportation systems are widely used, pipeline leakage has become a major challenge in the industry. Once a pipeline used to transport various liquids in industry leaks, 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 imminent.

[0003] Existing pipeline leakage detection technologies try to solve this problem based on different principles. For example, some methods based on pressure monitoring install pressure sensors on the pipeline to continuously monitor the changes in the pressure inside the pipeline. During normal operation, the pressure inside the pipeline is in a relatively stable state. When a leak occurs, the pressure will drop. The system determines whether a leak has occurred based on the preset pressure threshold or pressure change rate. There are also technologies based on flow monitoring, which compare the flow difference between the inlet and outlet of the pipeline. When the difference exceeds the normal range, it is inferred that there may be a leak.

[0004] However, the existing technology still has obvious defects. Although the pressure monitoring method can detect larger leaks to a certain extent, it is often not sensitive enough for small leaks, because the pressure change caused by small leaks is very subtle and may be misjudged by the system as normal pressure fluctuations, resulting in missed detection. Moreover, the pressure is easily disturbed by various factors, such as temperature changes of the medium in the pipeline, etc. These interference factors will reduce the accuracy of detection. The technology based on flow monitoring also faces accuracy problems. In actual operation, there is a certain error in the flow measurement itself. When the leakage is small, it is difficult to accurately identify the leakage signal from the normal flow fluctuation. In addition, most of these traditional technologies are single-parameter detection methods, which cannot comprehensively consider the various complex situations in pipeline operation and are difficult to meet the requirements of modern pipeline transportation for high precision, high reliability and high adaptability of leak detection. Summary of the invention

[0005] 1. Technical issues to be resolved In view of the shortcomings of the prior art, the present invention provides a method for detecting and locating water pipeline leakage, which collects multiple parameters such as acoustics, pressure, vibration, electromagnetic signals, conveying medium and external environment, and calculates corresponding indexes based on these parameters, thereby obtaining a comprehensive leakage index to determine whether there is a leakage, and after the leakage is determined, the environmental leakage value is calculated in combination with the external environmental parameters to determine the location of the leakage source. The problems of low detection efficiency, poor accuracy, inability to monitor in real time and difficulty in accurately locating the leakage source in traditional pipeline leakage detection technology are solved, the efficiency, accuracy and reliability of pipeline leakage detection are improved, and the risks of resource waste, environmental pollution and safety accidents are reduced.

[0006] (II) Technical solution To achieve the above objectives, the present invention is implemented through the following technical solutions: A method for detecting and locating a water pipeline leak, comprising: Collect acoustic parameters, pressure parameters, vibration parameters, electromagnetic signal parameters and conveying medium parameters of different conveying pipelines.

[0007] 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 conveying 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; determine whether the conveying pipeline is leaking based on the comparison result of the comprehensive leakage index CI and the comprehensive leakage index threshold JV.

[0008] After confirming the pipeline leakage, several monitoring points are set on the laying path of this 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 index 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.

[0009] In the preferred embodiment of the water pipeline leakage detection and positioning method, the specific steps of calculating the sound signal index SI are as follows: 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:

[0010] Among them, β1 represents the weight coefficient of the sound decibel value ES, and its value is 0.1≤β1≤0.4; β2 represents the weight coefficient of the sound signal frequency FS, and its value is 0.2≤β2≤0.5; β3 represents the weight coefficient of the sound signal time characteristic value TS, and its value is 0.3≤β3≤0.4, and β1+β2+β3=1.

[0011] In the preferred embodiment of the water pipeline leakage detection and positioning method, the specific steps of calculating the pressure index PI are as follows: 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:

[0012] 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.

[0013] In the preferred embodiment of the above-mentioned method for detecting and locating leakage in a water pipeline, the specific steps of calculating the vibration index VII are as follows: 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:

[0014] Where t1 represents the vibration time One of the time points in .

[0015] In the preferred embodiment of the above-mentioned method for detecting and locating water pipeline leakage, the specific steps of calculating the electromagnetic index EMII are as follows: Electromagnetic signal parameters include electric field strength E(t2), magnetic field strength H(t2), electromagnetic wave change frequency And observation time .

[0016] The electromagnetic index EMII is calculated based on the electromagnetic signal parameters, and the specific formula is as follows:

[0017] Where t2 is the observation time One of the time points in .

[0018] In the preferred embodiment of the above-mentioned method for detecting and locating leakage in a water pipeline, the specific steps of calculating the medium index MI are as follows: Conveying medium parameters include conveying medium parameters including 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:

[0019] Where C represents the corrosive factor, and its value is [0,1]. Represents the maximum amplitude factor value.

[0020] In the preferred embodiment of the above-mentioned method for detecting and locating leakage in a water pipeline, the specific steps of calculating the comprehensive leakage index CI are as follows: According to the pressure impact index PI, sound signal impact index SI, vibration impact index VII, electromagnetic index EMII and medium impact index MI, the leakage comprehensive index CI is calculated. The specific formula is as follows:

[0021] 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.

[0022] In the preferred embodiment of the above-mentioned method for detecting and locating water pipeline leakage, the specific steps of determining whether the pipeline is leaking are as follows: Set the leakage comprehensive index threshold JV; 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.

[0023] In the preferred embodiment of the water pipeline leakage detection and positioning method, the specific steps of calculating the environmental leakage value EI are as follows: External environmental parameters include humidity value W, temperature value Tc and soil pH Vbb; According to the external environmental parameters and the comprehensive leakage index CI, the environmental leakage value EI is calculated. The specific formula is as follows:

[0024] 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 H, and its value is 0.3≤c3≤0.5, and c1+c2+c3=1.

[0025] In the preferred embodiment of the above-mentioned method for detecting and locating a water pipeline leak, the specific steps of calculating the location of the leak source are: Compare the environmental leakage value EI at different monitoring points with the environmental leakage value threshold GV; If the environmental leakage index EI ≥ the environmental leakage index threshold GV, the corresponding monitoring point is determined to be the pipeline leakage location; If the environmental leakage index EI is less than the environmental leakage index threshold GV, it is determined that no pipeline leakage occurs at the corresponding monitoring point.

[0026] (III) Beneficial effects The present invention provides a method for detecting and locating water pipeline leakage, which has the following beneficial effects: (1) By collecting multi-dimensional parameters such as acoustics, pressure, vibration, electromagnetic signals, conveying media and external environment, it is possible to obtain all-round information on the pipeline operation status, provide a rich data basis for subsequent precise detection, improve the reliability and accuracy of detection, and avoid the limitations of single parameter detection.

[0027] (2) Calculate the pressure index PI, sound signal index SI, vibration index VII and medium index MI, and convert parameter data into intuitive and comparable indicators, which helps to analyze pipeline conditions more efficiently and highlight the contribution of each parameter to pipeline status assessment.

[0028] (3) The leakage comprehensive index CI is calculated based on the pressure index PI, sound signal index SI, vibration index VII and medium index MI. The comparison result of the leakage comprehensive index CI and the leakage comprehensive index threshold JV is used to judge whether the pipeline is leaking. By comparing it with the threshold, it can comprehensively and comprehensively evaluate whether the pipeline is leaking, reduce the possibility of misjudgment and missed judgment, timely discover potential safety hazards, and ensure the safety and stability of pipeline transportation.

[0029] (4) After confirming the leak, a monitoring point is set up to calculate the environmental leakage value, and the value is compared with the threshold to determine the location of the leak source. The leak point can be quickly located, which greatly shortens the maintenance time and cost, reduces the waste of resources, environmental pollution and possible safety accidents caused by the leak, and improves the efficiency and benefits of pipeline operation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The present invention is a flow chart of a method for detecting and locating water pipeline leakage. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figure 1 The present invention provides a water pipeline leakage detection and positioning method, comprising: Step 1: Collect acoustic parameters, pressure parameters, vibration parameters, electromagnetic signal parameters and conveying medium parameters of different conveying pipelines.

[0033] 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; determine whether the conveying pipeline is leaking based on the comparison result between the leakage comprehensive index CI and the leakage comprehensive index threshold JV.

[0034] Step 201: The specific steps of 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.

[0035] It should be noted that the sound decibel value ES represents the intensity of the sound signal in the water pipeline, which can be obtained by a sound level meter, and the unit of measurement is usually decibel.

[0036] The sound signal frequency FS refers to the number of times the sound signal vibrates in the water pipe per unit time, which can be obtained by a sound analyzer.

[0037] The time characteristic value TS of a sound signal refers to the comprehensive characteristic value of a 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 through an audio analyzer. The unit of measurement is seconds. These three values ​​are multiplied by their respective weight coefficients and summed up to obtain the time characteristic value TS of the sound signal. 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. The sum is then used to obtain the time characteristic value T of the sound signal. Among them, α1 is taken as 0.1<α1<0.4, α2 is taken as 0.2<α2<0.5, α3 is taken as 0.3<α3<0.4, and α1+α2+α3=1.

[0038] 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:

[0039] Among them, β1 represents the weight coefficient of the sound decibel value ES, and its value is 0.1≤β1≤0.4; β2 represents the weight coefficient of the sound signal frequency FS, and its value is 0.2≤β2≤0.5; β3 represents the weight coefficient of the sound signal time characteristic value TS, and its value is 0.3≤β3≤0.4, and β1+β2+β3=1.

[0040] It should be noted that the calculated sound signal index SI can be used for subsequent operations such as determining whether a pipeline is leaking. By comprehensively considering the energy, frequency and time characteristics of the sound signal and calculating it according to its weight coefficient, it can more comprehensively reflect the characteristics of the sound signal, thereby improving the accuracy of pipeline leakage detection.

[0041] 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 the multi-dimensional information of the sound signal and avoid the one-sidedness of single parameter evaluation. In pipeline leakage detection, it can accurately reflect the changes in the acoustic state of the pipeline, effectively improve the accuracy and reliability of leakage judgment, provide a strong basis for timely discovery and handling of pipeline leakage problems, and ensure the safe and stable operation of the pipeline transportation system.

[0042] Step 202: The specific steps of calculating the pressure index PI are: Pressure parameters include pressure measurements , average pressure value , pressure fluctuation value and time interval .

[0043] It should be noted that the pressure measurement value Obtained through pressure sensor; average pressure value It is achieved by measuring the pressure at different time points during the detection cycle. Sum and get the pressure fluctuation value by arithmetic average It is to count the pressure measurements at different time points , get the pressure measurement value The maximum and minimum values ​​are calculated by taking the difference; the time interval This 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.

[0044] 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:

[0045] 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.

[0046] It should be noted that for each pressure measurement value , first calculate , where the numerator represents the difference between the current pressure measurement and the average pressure value, which reflects the deviation of the current pressure from the average pressure. It is the pressure fluctuation value. The pressure deviation value is divided by the pressure fluctuation value to obtain a relative pressure deviation degree, that is, the pressure deviation is normalized, and all measurement results are summed and divided by the total number of pressure values ​​to calculate the average value. The data of multiple measurements are integrated to reduce the influence of single measurement errors. It can more accurately and stably reflect the pressure state of the system, help to timely discover abnormal pressure conditions, and ensure the safe operation of related systems; considering the time factor, and then dividing by the time interval, it reflects the overall situation of the relative fluctuation degree of pipeline pressure deviation from the average pressure within a given time interval. Its function is to consider the speed of pressure changes in time. If the time interval is small, it means that the pressure has changed in a short time, which will make the pressure index more sensitive to such rapid pressure changes.

[0047] The above calculation results are summed up, that is, the values ​​obtained from each measurement taking into account the pressure deviation and time factors are added up. Finally, it is divided by the number of measurements n to obtain the average pressure index PI, which comprehensively reflects the deviation of the pressure from the average pressure and the time characteristics of the pressure change within a certain period of time.

[0048] By calculation , dividing the difference between the pressure measurement and the average pressure value by the pressure fluctuation value can normalize the pressure deviation and make the systems with different fluctuation characteristics comparable. Taking the time interval factor into consideration, it can respond reasonably to fast or slow pressure changes and has a good reflection of the timeliness of pressure changes. Step 203: The specific steps of calculating the vibration index VII are: Vibration parameters include vibration amplitude A, vibration frequency F and vibration time .

[0049] It should be noted that the vibration amplitude A(t1) represents the amplitude of the vibration of the water pipeline at the time point (t1), and the vibration amplitude at different time points within the detection period can be obtained by a vibration sensor.

[0050] The vibration frequency F(t1) reflects the frequency of the water pipeline vibration at the time point (t1). The vibration frequency at different time points within the detection period is obtained by collecting the vibration signal of the water pipeline and performing fast Fourier transform FFT.

[0051] Vibration time , that is, the duration of the vibration of the water pipeline. The acceleration sensor can be used to set the trigger condition. When the vibration acceleration exceeds a certain set value, data collection is triggered. When the trigger condition is met, data collection starts and the start time is recorded. When the vibration signal continues for a period of time, the amplitude is lower than the trigger threshold or the collection is manually stopped, the end time is recorded to obtain the vibration time. .

[0052] 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:

[0053] Where t1 represents the vibration time One of the time points in .

[0054] It should be noted that the integral operation is the total vibration time The square of the product of the vibration amplitude A(t1) and the vibration frequency F(t1) at each time point is accumulated and summed. Through integral operation, it is possible to handle the situation where the amplitude and frequency change continuously over time, capture the subtle fluctuations at each moment, and then divide by time, that is, to find the average value of this accumulation in unit time. This step is critical. It avoids the evaluation deviation caused by different vibration durations, so that the results can focus on the comprehensive intensity of vibration in unit time; the square root is taken at the end to make the dimension of the vibration index consistent with the dimension of the product of amplitude and frequency, and at the same time restore the numerical amplification effect caused by the square operation, so that the vibration index is more in line with intuitive feelings, which is convenient for comparison with actual engineering experience values.

[0055] This formula comprehensively covers the relationship between vibration amplitude, frequency and time, and can fully reflect the vibration condition, avoiding the one-sidedness of single parameter evaluation.

[0056] Step 204: The specific steps of calculating the electromagnetic index EMII are as follows: Electromagnetic signal parameters include electric field strength E, magnetic field strength H, and electromagnetic wave change frequency And observation time .

[0057] It should be noted that the electric field strength E(t2) refers to the electric field conditions around the water pipeline at time point t2. The electric field strength E at different time points within the detection period can be measured by an electric field sensor. For example, if the pipeline transports a fluid with charged particles, such as electroplating wastewater in the electroplating industry containing a variety of metal ions, the electric field distribution will change due to fluid leakage near the leakage point.

[0058] The magnetic field strength H(t2) refers to the magnetic field strength at the time point (t2). Generally, the magnetic field strength H(t2) at different time points within the detection period is obtained by a Hall effect sensor or a magnetoresistive sensor. If the pipeline transports a fluid with charged particles, such as electroplating wastewater in the electroplating industry containing a variety of metal ions, pipeline leakage will change the measured value of the magnetic field strength near the leakage point.

[0059] Electromagnetic wave frequency changes It refers to the number of times the electromagnetic waves around the water pipeline complete periodic changes per unit time at time point t2. It can be measured by a spectrum analyzer. For example, if the pipeline transports a fluid with charged particles, such as electroplating wastewater in the electroplating industry containing a variety of metal ions, the microwave frequency will change near the leakage point due to pipeline leakage.

[0060] Observation time It represents the total duration of the observation, usually in seconds. This period of time can be set to analyze the complete cycle of the electromagnetic signal, limiting the time range of the integral operation.

[0061] The electromagnetic index EMII is calculated based on the electromagnetic signal parameters, and the specific formula is as follows:

[0062] Where t2 is the observation time One of the time points in .

[0063] It should be noted that this formula first calculates the time integral of the square of the electric field strength, magnetic field strength, and electromagnetic wave frequency, adds them up, divides them by the total time 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. The numerical value is easier to interpret and compare, so as to evaluate 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 leakage may generate new sources of electromagnetic interference, changing the magnetic field strength and the frequency of electromagnetic wave changes.

[0064] Comprehensive consideration of the electric field strength, magnetic field strength and the frequency of electromagnetic wave changes can fully reflect the surrounding electromagnetic environment. In terms of pipeline leakage detection, pipeline leakage may cause changes in the surrounding electromagnetic environment, such as leakage causing medium changes that affect the electric field, or generating new interference that changes the magnetic field and frequency. The electromagnetic index derived from this formula can be used as a sensitive indicator. Compared with traditional detection methods, it can detect electromagnetic anomalies caused by leakage earlier, improve the timeliness and accuracy of leak detection, effectively reduce the risk of pipeline leakage and subsequent losses, and ensure the safe and stable operation of the pipeline system.

[0065] Step 205: The specific steps of calculating the medium index MI are: Conveying medium parameters include medium density , medium viscosity And the flow rate deviation value V.

[0066] It should be noted that the medium density Refers to the mass of the medium per unit volume. Pipeline leakage will cause the medium to overflow from the pipeline, resulting in a decrease in the density of the medium in the pipeline. The density of the medium is measured by a densitometer installed in the pipeline. And the maximum density of the medium density during the measurement period .

[0067] Medium viscosity It reflects the internal friction of the medium when it flows in the pipeline. Pipeline leakage may cause the medium to mix or dilute, thereby 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 liquid, mixing with air or other liquids may cause viscosity changes. The viscosity of the medium can be directly obtained by the viscometer set in the pipeline. and the maximum viscosity of the medium during the measurement cycle .

[0068] The velocity deviation value V is the difference between the actual flow velocity of the medium in the conveying pipeline and the standard flow velocity. Pipeline leakage will cause the medium flow to decrease, thereby causing the flow velocity to increase. The 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. The velocity value V0 is measured by the velocity sensor installed in the pipeline. According to the velocity value V0 and the last measured velocity value To calculate the difference , get the velocity deviation value V and the maximum velocity deviation value .

[0069] According to the medium density , medium viscosity , velocity deviation value V, maximum density , flow rate value VO, maximum viscosity And the maximum flow rate deviation , the specific formula for calculating the medium index MI is as follows:

[0070] Where C represents the corrosive factor, and its value is [0,1]. Represents the maximum amplitude factor value, which is ≤1.

[0071] It should be noted that we first calculate , here is a reference flow rate, Medium density and Multiply the viscosity of the medium, then multiply by the corrosive factor C, and then multiply by ,This step is to consider the density and viscosity characteristics of the medium itself, as well as the impact of flow rate deviation on the medium, while also considering the corrosive factor.

[0072] calculate , this step is to consider the most extreme case.

[0073] Finally, divide the numerator by the denominator to get the medium index MI, which can be used to evaluate the medium's comprehensive index relative to the extreme situation under the current density, viscosity and flow rate deviation. If it is close to 1, it means that the current medium situation is close to the extreme situation; if it is smaller, it means that the current medium situation is relatively good.

[0074] By comprehensively considering the density of the medium , medium viscosity , velocity deviation value V, maximum density , maximum viscosity And the maximum flow rate deviation , can comprehensively evaluate the medium condition, compare the current medium condition with the extreme condition to obtain the medium index, and can intuitively reflect the state of the medium. This helps to predict risks in the fields of chemical industry, fluid transportation, etc., such as corrosion risk, flow abnormality, etc., and facilitate timely measures to ensure stable operation of the system and effectively improve the service life and operating efficiency of equipment.

[0075] Step 206: The specific steps of calculating the leakage comprehensive index CI are as follows: According to the pressure impact index PI, sound signal impact index SI, vibration impact index VII, electromagnetic index EMII and medium impact index MI, the leakage comprehensive index CI is calculated. The specific formula is as follows:

[0076] 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.

[0077] It should be noted that this formula comprehensively considers the five important parameters of pressure impact index PI, sound signal impact index SI, vibration impact index VII and medium impact index MI. Each parameter has a corresponding weight coefficient, which indicates the importance of different parameters when calculating the comprehensive index. By multiplying each parameter with its corresponding weight coefficient and then summing them, a comprehensive index that can comprehensively calculate the leakage comprehensive index CI is obtained.

[0078] This formula can avoid the limitations of single-factor evaluation and more accurately reflect whether there is a risk of leakage in the system. The index value is intuitive, which makes it easy for technicians to quickly judge the possibility of leakage, and helps to take preventive or repair measures in a timely manner in the fields of chemical industry, energy, etc., effectively reducing the probability of leakage accidents.

[0079] Step 207: Determine whether the delivery pipeline is leaking. The specific steps are: Set the leakage comprehensive index threshold JV.

[0080] It should be noted that the threshold is determined by conducting a simulated leakage experiment on a water pipeline in a laboratory. A water pipeline model can be constructed to artificially create leakage situations of different degrees, measure the corresponding leakage comprehensive index, and then determine a value that can effectively distinguish leakage based on the experimental data, that is, obtain the leakage comprehensive index threshold JV.

[0081] When the comprehensive leakage index CI ≥ the comprehensive leakage index threshold JV, it is judged that the water pipeline is leaking.

[0082] 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.

[0083] It should be noted that this scheme determines the leakage comprehensive index threshold JV by conducting a simulated leakage experiment on the water pipeline in the laboratory, constructs a water pipeline model, artificially creates leakage, and measures the corresponding leakage comprehensive index. In actual judgment, when the leakage comprehensive index CI ≥ the leakage comprehensive index threshold JV, the water pipeline is judged to be leaking; when the leakage comprehensive index CI < the leakage comprehensive index threshold JV, the water pipeline is judged to be normal and leak-free.

[0084] The solution determines the threshold through scientific experiments to make the judgment more accurate, detect leaks in advance, reduce losses caused by pipeline leaks, and ensure the normal operation of the water supply system. It also makes it easier for maintenance personnel to conduct targeted inspections and repairs on pipelines that may leak.

[0085] Step 3: After confirming the pipeline leakage, set up several monitoring points on the laying path of this pipeline, obtain the external environmental parameters of different monitoring points, and calculate the environmental leakage values ​​EI of different monitoring points according to the external environmental parameters and the comprehensive leakage index CI; set the environmental leakage index threshold GV, compare the environmental leakage values ​​EI of different monitoring points with the environmental leakage value threshold GV, and determine the location of the leakage source according to the comparison results.

[0086] Step 301: The specific steps of calculating the environmental leakage value EI are: External environmental parameters include humidity value W, temperature value Tc and soil pH Vbb.

[0087] It should be noted that the area around the leaking pipe is analyzed, including the humidity value W, temperature value Tc and soil pH Vbb; by collecting soil samples at the monitoring points and then analyzing the soil samples, the humidity value W, temperature value Tc and soil pH Vbb of the soil samples are obtained, which can be obtained through humidity sensors, temperature sensors and soil pH testers and other equipment.

[0088] According to the external environmental parameters and the comprehensive leakage index CI, the environmental leakage value EI is calculated. The specific formula is as follows:

[0089] 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 H, and its value is 0.3≤c3≤0.5, and c1+c2+c3=1.

[0090] 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, which indicates the importance of different parameters when calculating the comprehensive index. By multiplying each external environmental parameter with its corresponding weight coefficient and then summing them up, a comprehensive index that can fully describe the audio characteristics is obtained.

[0091] This formula comprehensively considers the impact of humidity value W, temperature value Tc and soil pH H on pipelines, has many beneficial effects, can comprehensively evaluate the environmental conditions of pipelines, and provide a scientific basis for pipeline maintenance. By quantifying the impact of various factors, accurately predicting the risk of pipeline erosion or damage by the environment, and providing early warning of possible leakage and other problems, it is helpful to formulate targeted protection strategies, reduce maintenance costs, extend the service life of pipelines, and ensure the safe and stable operation of pipeline systems.

[0092] Step 302: The specific steps of calculating the leakage source position are: The environmental leakage value EI at different monitoring points is compared with the environmental leakage value threshold GV.

[0093] It should be noted that the environmental leakage value threshold GV is obtained by collecting environmental parameters around a plurality of pipelines without leakage, calculating the environmental leakage index, and averaging all the environmental leakage indexes as the environmental leakage value threshold GV.

[0094] If the environmental leakage index EI ≥ the environmental leakage index threshold GV, the corresponding monitoring point is determined to be the pipeline leakage location.

[0095] If the environmental leakage index EI is less than the environmental leakage index threshold GV, it is determined that no pipeline leakage occurs at the corresponding monitoring point.

[0096] 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 risk of pipeline leakage caused by environmental factors; if the environmental leakage index EI < the environmental leakage index threshold GV, the pipeline environment is determined to be safe. In this way, the leakage of water pipelines caused by environmental factors can be monitored and judged.

[0097] This solution can monitor the pipeline environmental conditions in real time, comprehensively consider and improve the accuracy of leakage judgment, facilitate timely maintenance, reduce the occurrence of leakage accidents, ensure stable water supply, reduce water resource waste and economic losses caused by leakage, and extend the service life of the pipeline.

[0098] The above embodiments may be implemented in whole or in part by software, hardware, firmware or any other combination thereof. When implemented using software, the above embodiments may be implemented in whole or in part in the form of a computer program product. A person of ordinary skill in the art may appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein may be implemented in electronic hardware or in combination with computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution.

[0099] 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 on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0100] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in 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 this 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 index 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.

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: Among them, β1 represents the weight coefficient of the sound decibel value ES, and its value is 0.1≤β1≤0.4; β2 represents the weight coefficient of the sound signal frequency FS, and its value is 0.2≤β2≤0.5; β3 represents the weight coefficient of the sound signal time characteristic value TS, and its value is 0.3≤β3≤0.4, and β1+β2+β3=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: Electromagnetic signal parameters include electric field strength E(t2), magnetic field strength H(t2), electromagnetic wave change frequency And 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 amplitude factor value.

7. A water pipeline leakage detection and positioning method according to claim 6, characterized in that: The specific steps for calculating the comprehensive leakage index CI are: According to the pressure impact index PI, sound signal impact index SI, vibration impact index VII, electromagnetic index EMII and medium impact index MI, the leakage comprehensive index CI is calculated. The specific formula 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, and its value is 0.1< ≤0.3, is the impact factor of the electromagnetic index EMII, with a value of 0.1≤ ≤0.2, and + + + + =1.

8. A water pipeline leakage detection and positioning method according to claim 7, 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.

9. A water pipeline leakage detection and positioning method according to claim 8, characterized in that: The specific steps for calculating the environmental leakage value EI are: External environmental parameters include humidity value W, temperature value Tc and soil pH Vbb; According to the external environmental parameters and the comprehensive leakage index CI, the environmental leakage value EI is calculated. The specific formula 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 H, and its value is 0.3≤c3≤0.5, and c1+c2+c3=1.

10. A water pipeline leakage detection and positioning method according to claim 9, 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 index EI ≥ the environmental leakage index threshold GV, the corresponding monitoring point is determined to be the pipeline leakage location; If the environmental leakage index EI is less than the environmental leakage index threshold GV, it is determined that no pipeline leakage occurs at the corresponding monitoring point.

Images