Method for monitoring operation state of flap gate

Abstract

The invention provides a method for monitoring the running state of a flap gate, which comprises the following steps of: respectively measuring the displacement value of the flap gate and the pressure difference value of two sides through a displacement sensor and a pressure sensor, and calculating the theoretical pressure difference value corresponding to the current displacement value in combination with rated running parameters and a running characteristic curve; the instantaneous flow value is calculated according to the actual operation parameters and the displacement value, and the theoretical pressure difference value under the actual working condition is further deduced; and comparing the deviation between the two parameters, if the deviation is smaller than a threshold value, outputting a first pressure difference value, otherwise, adjusting the actual operation parameter into a target operation parameter through parameter interpolation, and recalculating the pressure difference value based on the target parameter. Wherein theoretical values under rated parameters are obtained through characteristic curve interpolation, theoretical values under actual parameters are dynamically calculated through instantaneous flow, a Bernoulli equation and the like, and operation parameters are optimized through a compensation mechanism when deviation exceeds the limit. The monitoring precision can be improved, and the operation stability can be optimized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fluid control device monitoring, and more particularly, to a tongue flap gate operation state monitoring method. BACKGROUND

[0002] The tongue flap gate, as a common water conservancy facility, is widely used in flood discharge, ice discharge, water level regulation, etc. Its working principle is to rotate around the horizontal shaft at the bottom of the gate leaf to open and close, and when water flows, the gate is tilted to a certain position, and the water flows over the upper part of the gate. However, the existing tongue flap gate operation state monitoring technology has some problems. The traditional monitoring method mainly relies on simple sensor data collection, such as displacement sensors or pressure sensors, but lacks in-depth analysis and comprehensive evaluation of the monitoring data. In addition, the existing technology also has shortcomings in monitoring accuracy and real-time performance, making it difficult to accurately reflect the dynamic changes of the tongue flap gate in actual operation.

[0003] In the process of implementing the embodiments of the present application, the inventors have found that the existing technology at least has the following problems or defects: First, the existing monitoring method cannot effectively combine the rated operating parameters and operating characteristic curves of the tongue flap gate for accurate analysis, resulting in low accuracy and reliability of the monitoring results. Second, when an abnormality is detected, there is a lack of effective operation state compensation and parameter adjustment mechanism, which cannot correct the deviation in time and ensure the stable operation of the equipment. Finally, the existing technology fails to fully utilize key parameters such as instantaneous flow and fluid flow rate for comprehensive evaluation, resulting in incomplete monitoring of the tongue flap gate operation state. SUMMARY

[0004] The present application provides a tongue flap gate operation state monitoring method, comprising: measuring the displacement value of the tongue flap gate by a displacement sensor, measuring the pressure difference value on both sides of the tongue flap gate by a pressure sensor, and based on the measured displacement value and pressure difference value, the rated operating parameters and operating characteristic curves of the tongue flap gate, obtaining the theoretical pressure difference value corresponding to the measured displacement value under the rated operating parameters as the first pressure difference value; According to the actual operating parameters of the tongue flap gate and the measured displacement value, the instantaneous flow value of the tongue flap gate is calculated; based on the instantaneous flow value and the measured displacement value, the theoretical pressure difference value of the tongue flap gate under the actual operating parameters is obtained as the second pressure difference value; The deviation of the second pressure difference value and the first pressure difference value is calculated, and if the deviation is less than a threshold value, the first pressure difference value is output by the monitoring system; otherwise, the actual operating parameters are changed to target operating parameters through operation state compensation and parameter interpolation, and the corresponding pressure difference value after interpolation is obtained based on the target operating parameters.

[0005] Further, the theoretical pressure difference value corresponding to the rated operating parameters is obtained as the first pressure difference value by the following steps: finding two operating characteristic curves closest to the measured displacement value and the pressure difference value through characteristic curve interpolation; calculating a displacement ratio coefficient based on the measured displacement value and the displacement values corresponding to the two operating characteristic curves closest to the measured displacement value; obtaining a theoretical pressure difference value corresponding to the measured displacement value of the flap valve under the rated operating parameters based on the displacement ratio coefficient and the theoretical pressure difference values corresponding to the two operating characteristic curves closest to the measured displacement value.

[0006] Further, the displacement ratio coefficient is calculated through the following formula:

[0007] wherein, the measured displacement value is represented by, and the displacement values corresponding to the two operating characteristic curves closest to the measured displacement value under the rated operating parameters are represented by.

[0008] Further, the theoretical pressure difference value corresponding to the measured displacement value of the flap valve under the rated operating parameters is obtained as the first pressure difference value through the following formula:

[0009] wherein, and the pressure difference values corresponding to the two operating characteristic curves closest to the measured displacement value under the rated operating parameters are represented by.

[0010] Further, the obtaining of the theoretical pressure difference value of the flap valve under the actual operating parameters based on the instantaneous flow value and the measured displacement value comprises: obtaining a fluid flow rate based on the instantaneous flow value and the measured displacement value, and obtaining a theoretical pressure difference value under an equal flow rate condition based on the fluid flow rate; calculating the theoretical pressure difference value under the actual operating parameters through the Bernoulli equation based on the actual operating parameters of the flap valve and the density of the fluid.

[0011] Further, the fluid flow rate is obtained through the following equation:

[0012] wherein, the instantaneous flow value is represented by, the opening area of the flap valve is represented by, the fluid density is represented by, the fluid viscosity is represented by, the correction coefficient is represented by, the measured displacement value is represented by.

[0013] Further, the theoretical pressure difference value under the actual operating parameters is calculated through the following Bernoulli equation:

[0014] wherein, is the fluid density, is the fluid flow rate, is the gravitational acceleration, is the height difference between the two sides of the flap gate, is the kinetic energy correction coefficient.

[0015] Further, the deviation of the second pressure difference value from the first pressure difference value is calculated by the following formula:

[0016] wherein, represents the theoretical pressure difference value corresponding to the measured displacement value under the rated operating parameters, represents the theoretical pressure difference value of the flap gate under the actual operating parameters.

[0017] Further, the parameter interpolation by operating state compensation to change the actual operating parameters to the target operating parameters comprises: When the plurality of rated operating parameters of the flap gate are built-in in the monitoring system, the minimum deviation is selected from the deviations of the second pressure difference value from all the first pressure difference values, and the built-in rated operating parameter corresponding to the minimum deviation is the built-in rated operating parameter closest to the actual operating parameter, i.e., the target operating parameter; The parameter interpolation by operating state compensation changes the actual operating parameters to the target operating parameters.

[0018] Further, the pressure difference value corresponding to the interpolated target operating parameters comprises: The theoretical pressure difference value of the flap gate under the target operating parameters is obtained based on the measured displacement value, the pressure difference value, and the compensated total flow value.

[0019] The tongue flap gate operating state monitoring method has at least the following beneficial effects: the tongue flap gate operating state monitoring method can effectively improve the monitoring accuracy and reliability. By combining the measurement data of the displacement sensor and the pressure sensor, and analyzing and calculating according to the rated operating parameters and the operating characteristic curve of the flap gate, the theoretical pressure difference value under different conditions can be accurately obtained, and compared and analyzed with the actual measured value. At the same time, by using the characteristic curve interpolation, parameter compensation and other means, the determination process of the operating parameters can be further optimized, and the monitoring result is closer to the actual operating state, which provides a strong guarantee for the safe and stable operation of the flap gate.

[0020] In addition, the method can also realize real-time dynamic monitoring and adjustment of the operating state of the flap gate. Based on the calculation of the instantaneous flow value and the displacement value, the pressure change of the flap gate in actual operation can be quickly reflected, abnormal deviations can be found in time and corresponding compensation processing can be performed, so that the flap gate can always work under the best operating parameters, the service life of the equipment can be prolonged, and the production efficiency and economic benefits can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description read in conjunction with the accompanying drawings. In the drawings, several embodiments of the present application are illustrated by way of example in which: Figure 1 A flowchart of an operating state monitoring method of a flap gate according to an embodiment of the present application is shown in FIG. 1. Figure 2 A structure diagram of a flap gate according to an embodiment of the present application is shown in FIG. 2. DETAILED DESCRIPTION

[0022] The principles and spirits of the present application will be described below with reference to several exemplary embodiments. It should be understood that these embodiments are given only to enable those skilled in the art to better understand and implement the present application, and do not limit the scope of the present application in any way. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0023] Those skilled in the art know that the embodiments of the present application can be implemented as a system, device, apparatus, method or computer program product. Therefore, the present application can be embodied in the form of a complete hardware, complete software (including firmware, resident software, microcode, etc.), or a combination of hardware and software.

[0024] It should be noted that any number of elements in the drawings is used for example and not limitation, and any naming is only used for distinction and does not have any limiting meaning.

[0025] Embodiment 1 The principles and spirits of the present application will be described below with reference to several exemplary embodiments. It should be understood that these embodiments are given only to enable those skilled in the art to better understand and implement the present application, and do not limit the scope of the present application in any way. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art. Figure 1 , Figure 1 A flowchart of an operating state monitoring method of a flap gate according to an embodiment of the present application is shown in FIG. 1. Figure 1 As shown in FIG. 1, an operating state monitoring method of a flap gate includes: S1 measures the displacement value of the flap gate by a displacement sensor and measures the pressure difference value on both sides of the flap gate by a pressure sensor, and based on the measured displacement value and pressure difference value and the rated operating parameters and operating characteristic curve of the flap gate, a theoretical pressure difference value corresponding to the measured displacement value under the rated operating parameters is obtained as a first pressure difference value; S2 calculates the instantaneous flow value of the flap gate according to the actual operating parameters and the measured displacement value of the flap gate, and based on the instantaneous flow value and the measured displacement value, a theoretical pressure difference value of the flap gate under the actual operating parameters is obtained as a second pressure difference value; S3 calculates the deviation of the second pressure difference value from the first pressure difference value, and if the deviation is less than a threshold value, the first pressure difference value is output by the monitoring system; otherwise, the actual operating parameters are changed to target operating parameters through operating state compensation and parameter interpolation, and a corresponding pressure difference value after interpolation is obtained based on the target operating parameters.

[0026] It should be noted that the method measures the displacement value of the flap gate by a displacement sensor, which is a device that can convert the position change of an object into an electrical signal, and is used to monitor the opening or closing degree of the flap gate in real time. At the same time, the pressure difference value on both sides of the flap gate is measured by a pressure sensor, which is a device that can detect fluid pressure and convert pressure changes into electrical signals, and is used to monitor the pressure effect of the fluid on both sides of the flap gate. Based on the measured displacement value and pressure difference value and the rated operating parameters and operating characteristic curve of the flap gate, a theoretical pressure difference value corresponding to the measured displacement value under the rated operating parameters is obtained as a first pressure difference value. The rated operating parameters refer to the standard parameters specified for the flap gate during design and normal operation, including flow, pressure, displacement, etc., while the operating characteristic curve is a graph describing the performance changes of the flap gate under different operating conditions, usually drawn according to experimental data. Through these parameters and curves, the theoretical pressure difference value under a certain displacement can be calculated as the basis for subsequent monitoring and analysis.

[0027] Specifically, the first pressure difference value refers to the theoretical pressure difference value calculated from the measured displacement value through the operating characteristic curve under the rated operating parameters of the flap gate. The displacement value is the change in the position of the gate leaf during the opening or closing process of the flap gate, usually measured in millimeters or centimeters. The pressure difference value refers to the pressure difference between the two sides of the fluid in the flap gate, measured in pascals (Pa). The rated operating parameters include the design flow rate and design pressure of the flap gate, which are the standard conditions that the flap gate should meet under normal working conditions. The operating characteristic curve is a graph drawn based on experimental data of the flap gate under different operating conditions, reflecting the relationship between displacement, pressure difference, flow rate, and other parameters. Through these parameters and the curve, the theoretical pressure difference value at a specific displacement can be calculated as the basis for subsequent monitoring and analysis. The instantaneous flow rate value refers to the flow rate of the fluid through the flap gate at a certain moment, measured in cubic meters per second (m³ / s). By calculating the instantaneous flow rate value and the measured displacement value, the theoretical pressure difference value of the flap gate under actual operating parameters can be obtained, which is the second pressure difference value. The deviation refers to the difference between the second pressure difference value and the first pressure difference value, and by calculating the deviation, it can be determined whether the actual operating state of the flap gate is consistent with the rated operating state.

[0028] Preferably, when calculating the displacement proportionality coefficient, the measured displacement value and the displacement values corresponding to the two closest operating characteristic curves under the rated operating parameters can be proportionally calculated. The displacement proportionality coefficient is used to correct the difference between the measured value and the theoretical value, ensuring the accuracy of the calculation results. When calculating the second pressure difference value, the fluid flow rate and Bernoulli's equation can be used. The fluid flow rate can be calculated from the instantaneous flow rate value, the opening area of the flap gate, the fluid density, the fluid viscosity, and other parameters, while Bernoulli's equation is used to calculate the theoretical pressure difference value based on the fluid flow rate and the actual operating parameters. In addition, when the deviation exceeds the threshold value, parameter interpolation can be performed through operating state compensation to make the actual operating parameters close to the target operating parameters. Operating state compensation is an adjustment mechanism that adjusts the actual operating parameters to the target operating parameters through interpolation algorithms, ensuring that the flap gate operates in the best state.

[0029] In some embodiments, the corresponding theoretical pressure difference value under the rated operating parameters is obtained as the first pressure difference value by the following steps: Finding the two closest operating characteristic curves based on the measured displacement value and pressure difference value through characteristic curve interpolation; Calculating the displacement proportionality coefficient based on the measured displacement value and the displacement values corresponding to the two closest operating characteristic curves; Obtaining the theoretical pressure difference value corresponding to the measured displacement value of the flap gate under the rated operating parameters based on the displacement proportionality coefficient and the theoretical pressure difference values corresponding to the two closest operating characteristic curves.

[0030] It is noted that the two operating characteristic curves closest to the measured displacement value are found by interpolation in the present embodiment, in order to more accurately determine the theoretical pressure difference of the flap valve under the rated operating parameters. The operating characteristic curve is a graph drawn according to experimental data of the flap valve under different operating conditions, reflecting the relationship between displacement, pressure difference, and other parameters. By interpolation, a curve closer to the actual operating state can be found among the known characteristic curves, thereby improving the calculation accuracy. The displacement ratio coefficient is calculated based on the measured displacement value and the displacement values corresponding to the two closest operating characteristic curves, and is used to correct the theoretical pressure difference, making it more consistent with the actual situation.

[0031] Specifically, the operating characteristic curve is a graph describing the performance changes of the flap valve under different operating conditions, typically including the relationship between displacement, pressure difference, flow rate, and other parameters. In the present embodiment, the two closest operating characteristic curves are found based on the measured displacement value, and these two curves correspond to different operating states. The displacement ratio coefficient is calculated based on the measured displacement value and the displacement values corresponding to the two curves, and is used to adjust the theoretical pressure difference. The measured displacement value refers to the actual measured displacement of the flap valve, while the displacement value under the rated operating parameters refers to the displacement of the flap valve under standard operating conditions. By calculating the displacement ratio coefficient, the measured displacement value can be associated with the theoretical value, thereby obtaining a more accurate theoretical pressure difference.

[0032] Preferably, in order to more accurately calculate the displacement ratio coefficient, a linear interpolation method can be used. First, the position of the measured displacement value between the two operating characteristic curves is determined, and then the corresponding displacement ratio coefficient is calculated by linear interpolation formula based on the displacement values and pressure difference values of the two curves. The specific steps are as follows: first, find the proportional relationship of the measured displacement value between the two operating characteristic curves; second, according to the proportional relationship, combine the pressure difference values of the two curves to calculate the theoretical pressure difference corresponding to the measured displacement value. This method can effectively improve the calculation accuracy and ensure the accuracy of the flap valve operating state monitoring.

[0033] In some embodiments, the displacement ratio coefficient is calculated by the following formula:

[0034] wherein, represents the measured displacement value, and represents the displacement values corresponding to the two closest operating characteristic curves under the rated operating parameters.

[0035] It should be noted that the displacement ratio coefficient mentioned in the present embodiment is a key parameter for further accurately calculating the corresponding theoretical pressure difference of the flap door under the rated operating parameters. The calculation of this coefficient is based on the proportional relationship between the measured displacement value and the displacement values corresponding to the two closest operating characteristic curves under the rated operating parameters. In this way, the state of the flap door in actual operation can be more accurately reflected, thereby improving the reliability of the monitoring results. The calculation of the displacement ratio coefficient is realized through a specific formula, which takes into account the relationship between the measured displacement value and the displacement values of the two operating characteristic curves, thereby providing a basis for subsequent pressure difference calculation.

[0036] Specifically, the calculation formula of the displacement ratio coefficient is determined according to the measured displacement value and the displacement values corresponding to the two closest operating characteristic curves under the rated operating parameters. Among them, the measured displacement value refers to the actual displacement data of the flap door measured by the displacement sensor, while the displacement value under the rated operating parameters refers to the displacement design value or experimental value of the flap door under standard working conditions. The two operating characteristic curves correspond to different operating states, and by calculating the proportional relationship of the measured displacement value between the two curves, the displacement ratio coefficient can be obtained. This coefficient is used to correct the theoretical pressure difference, making it closer to the actual operating state. The parameters in the formula include the measured displacement value, the displacement values corresponding to the two operating characteristic curves, etc., and the setting of these parameters needs to be determined according to the actual operating characteristics and design parameters of the flap door.

[0037] Preferably, in order to more accurately calculate the displacement ratio coefficient, the following steps can be adopted: first, obtain the actual displacement value of the flap door through the displacement sensor; second, find the two closest curves to the measured displacement value according to the operating characteristic curves of the flap door, and obtain the displacement values corresponding to the two curves; then, calculate the displacement ratio coefficient according to these displacement values. Specifically, the displacement ratio coefficient can be determined by the difference and proportional relationship between the measured displacement value and the displacement values of the two operating characteristic curves. For example, if the measured displacement value is 50 mm, and the displacement values corresponding to the two operating characteristic curves are 40 mm and 60 mm respectively, then the displacement ratio coefficient can be obtained by calculating the difference proportion between the measured value and these two values. This method can effectively improve the calculation accuracy of the displacement ratio coefficient, thereby providing a more accurate basis for subsequent theoretical pressure difference calculation.

[0038] In some embodiments, the theoretical pressure difference corresponding to the measured displacement value of the flap door under the rated operating parameters is obtained as the first pressure difference by the following formula:

[0039] wherein, and represents the pressure difference value corresponding to the two operating characteristic curves closest to the measured displacement value under the rated operating parameters.

[0040] It should be noted that the theoretical pressure difference value of the flap door under the rated operating parameters calculated by the specific formula in the embodiment is to more accurately determine the theoretical pressure difference of the flap door under the standard working condition. This method uses the displacement ratio coefficient and the theoretical pressure difference values corresponding to the two closest operating characteristic curves to calculate the theoretical pressure difference value closer to the actual operating state. The displacement ratio coefficient is calculated by the measured displacement value and the displacement value corresponding to the two closest operating characteristic curves under the rated operating parameters, and is used to correct the theoretical pressure difference value to make it more consistent with the actual situation. In this way, the accuracy and reliability of the monitoring results can be effectively improved.

[0041] Specifically, the first pressure difference value mentioned in the embodiment refers to the theoretical pressure difference value calculated by interpolation under the rated operating parameters of the flap door. This value is calculated based on the measured displacement value and the displacement values and pressure difference values corresponding to the two closest operating characteristic curves. The displacement ratio coefficient is calculated by the proportional relationship between the measured displacement value and the displacement values corresponding to the two operating characteristic curves, and is used to adjust the theoretical pressure difference value. The pressure difference value corresponding to the two closest operating characteristic curves under the rated operating parameters refers to the pressure difference value corresponding to the two operating characteristic curves obtained by experiment or design under the design or standard working condition of the flap door. These parameters need to be determined according to the actual operating characteristics and design parameters of the flap door, for example, the pressure difference values of the flap door under different displacements obtained by experimental measurement or design calculation.

[0042] Preferably, to more accurately calculate the first pressure difference value, the following steps can be taken: first, obtain the actual displacement value of the flap door through the displacement sensor; second, find the two curves closest to the measured displacement value according to the operating characteristic curves of the flap door, and obtain the displacement values and pressure difference values corresponding to the two curves; third, calculate the displacement ratio coefficient according to these displacement values and pressure difference values; and finally, use the displacement ratio coefficient and the pressure difference values of the two curves to calculate the first pressure difference value by interpolation formula. For example, assuming that the measured displacement value is 50 mm, the displacement values corresponding to the two operating characteristic curves are 40 mm and 60 mm respectively, and the pressure difference values are 10 Pa and 15 Pa respectively, then the theoretical pressure difference value corresponding to the measured displacement value can be calculated by interpolation. This method can effectively improve the calculation accuracy of the first pressure difference value, thereby providing a more accurate theoretical basis for the operating state monitoring of the flap door.

[0043] In some embodiments, the obtaining of the theoretical pressure difference value of the flap door under the actual operating parameters based on the instantaneous flow value and the measured displacement value comprises: The fluid flow rate is obtained based on the instantaneous flow value and the measured displacement value, and the theoretical pressure difference value under the isoflow condition is obtained based on the fluid flow rate; The theoretical pressure difference value under the actual operating parameter is calculated by Bernoulli equation based on the actual operating parameter of the flap door and the density of the fluid.

[0044] It should be noted that the theoretical pressure difference value of the flap door under the actual operating parameter based on the instantaneous flow value and the measured displacement value mentioned in the embodiment is to more comprehensively evaluate the operating state of the flap door. The instantaneous flow value refers to the flow rate of the fluid passing through the flap door at a certain time, while the measured displacement value refers to the actual opening or closing degree of the flap door. By combining these two parameters, the flow state of the fluid at the flap door can be more accurately reflected, and the theoretical pressure difference value can be further calculated. This method not only considers the mechanical displacement of the flap door, but also combines the fluid dynamics characteristics, thereby providing a more comprehensive reference for monitoring the operating state of the flap door.

[0045] Specifically, the instantaneous flow value is obtained by calculating the flow rate of the fluid passing through the flap door at a certain time, which is related to the opening area of the flap door, the flow rate of the fluid, and the physical properties of the fluid such as density and viscosity. The measured displacement value refers to the actual opening or closing degree of the flap door, which is usually measured by a displacement sensor. In actual operation, the opening area of the flap door will change with the displacement, so it is necessary to combine the instantaneous flow value and the displacement value to calculate the flow rate of the fluid. The calculation of the flow rate of the fluid needs to consider the opening area of the flap door, the density and viscosity of the fluid, etc. By calculating the flow rate of the fluid, the theoretical pressure difference value under the actual operating parameter can be further calculated by Bernoulli equation. Bernoulli equation is an important equation in fluid mechanics, which is used to describe the conservation of energy of fluid in the flow process, and it considers the conversion between kinetic energy, potential energy and pressure energy of fluid.

[0046] Preferably, to more accurately calculate the theoretical pressure difference under actual operating parameters, the following steps can be taken: first, obtain the instantaneous flow value through a flow sensor or calculation method; second, calculate the flow rate of the fluid based on the opening area of the flap gate and the physical properties of the fluid (such as density and viscosity); then, use the Bernoulli equation to calculate the theoretical pressure difference, combining parameters such as fluid flow rate, fluid density, gravitational acceleration, and height difference on both sides of the flap gate. For example, assuming the instantaneous flow value is 10 cubic meters per second, the opening area of the flap gate is 2 square meters, the fluid density is 1000 kilograms per cubic meter, the fluid viscosity is 0.001 Pascal seconds, the gravitational acceleration is 9.8 meters per square second, and the height difference on both sides of the flap gate is 1 meter, the fluid flow rate can be calculated from these parameters, and the theoretical pressure difference can be further calculated using the Bernoulli equation. This method can effectively improve the calculation accuracy of the theoretical pressure difference, thereby providing a more accurate theoretical basis for monitoring the operating state of the flap gate.

[0047] In some embodiments, the fluid flow rate is obtained by the following equation:

[0048] wherein, is the instantaneous flow value, is the opening area of the flap gate, is the fluid density, is the fluid viscosity, is the correction coefficient, is the measured displacement value.

[0049] It should be noted that the fluid flow rate obtained by the specific equation mentioned in this embodiment is to more accurately calculate the fluid dynamics parameters of the flap gate in actual operation. The fluid flow rate is an important parameter that describes the speed of fluid flow at the opening of the flap gate, which directly affects the flow control and pressure distribution of the flap gate. By combining the instantaneous flow value, the opening area of the flap gate, the fluid density, the fluid viscosity, the correction coefficient, and the measured displacement value, the flow state of the fluid under actual operating conditions can be more comprehensively reflected. This method considers multiple influencing factors and can provide more accurate flow rate data for subsequent pressure difference calculation.

[0050] Specifically, the instantaneous flow rate refers to the fluid flow rate through the flap gate at a certain moment, usually measured in cubic meters per second (m³ / s). The opening area of the flap gate refers to the actual cross-sectional area available for fluid flow at a certain displacement, which is closely related to the structural design and displacement value of the flap gate. The fluid density refers to the mass per unit volume of fluid, usually measured in kilograms per cubic meter (kg / m³), which reflects the degree of fluid concentration. The fluid viscosity refers to the internal resistance of the fluid, usually measured in Pascal-seconds (Pa·s), which affects the flow characteristics of the fluid. The correction coefficient is an empirical coefficient used to adjust the calculation results to be closer to the actual value, which may be related to the flow state of the fluid (such as laminar or turbulent flow). The measured displacement value refers to the actual opening or closing degree of the flap gate, usually measured by a displacement sensor. Through these parameters, an equation can be constructed to calculate the fluid flow rate considering multiple factors.

[0051] Preferably, to more accurately calculate the fluid flow rate, the following steps can be taken: first, measure the instantaneous flow rate through the flow sensor; second, calculate the actual opening area of the flap gate based on the structural design and measured displacement value of the flap gate; then, combine the physical properties of the fluid such as density and viscosity, and the correction coefficient, to calculate the fluid flow rate through a specific equation. For example, assuming the instantaneous flow rate is 10 cubic meters per second, the opening area of the flap gate is 2 square meters, the fluid density is 1000 kilograms per cubic meter, the fluid viscosity is 0.001 Pascal-seconds, the correction coefficient is 1.2, and the measured displacement value is 50 millimeters, these parameters can be input into the equation to calculate the fluid flow rate. This method can effectively improve the calculation accuracy of the fluid flow rate, thereby providing more accurate fluid dynamics parameters for monitoring the operating state of the flap gate.

[0052] In some embodiments, the theoretical pressure difference value under the actual operating parameters is calculated by the following Bernoulli equation:

[0053] wherein, is the fluid density, is the fluid flow rate, is the acceleration of gravity, is the height difference between the two sides of the flap gate, is the kinetic energy correction coefficient.

[0054] It is worth noting that in this embodiment, the theoretical pressure difference under actual operating parameters is calculated by Bernoulli equation, in order to more accurately evaluate the pressure state of the flap gate in actual operation. Bernoulli equation is a basic equation in fluid mechanics, which is used to describe the conservation of energy of ideal fluid during flow. It considers the conversion between kinetic energy, potential energy and pressure energy of fluid, which can help us calculate the theoretical pressure difference according to the flow rate, density, height difference and other parameters of fluid. This method combines the basic principles of fluid dynamics and the actual operating parameters of the flap gate, thus providing a scientific and accurate means for monitoring the operating state of the flap gate.

[0055] Specifically, the fluid density in Bernoulli equation refers to the mass of unit volume of fluid, usually expressed in kilograms per cubic meter (kg / m³), which reflects the density of fluid. The flow rate of fluid refers to the flow speed of fluid at the opening of the flap gate, usually expressed in meters per second (m / s), which can be calculated by the instantaneous flow value and the opening area. The gravitational acceleration is a constant, about 9.8 meters per square second (m / s²), which reflects the effect of earth's gravity on fluid. The height difference between the two sides of the flap gate refers to the vertical height difference of fluid at the two sides of the flap gate, usually expressed in meters (m), which affects the potential energy of fluid. The kinetic energy correction coefficient is an empirical coefficient used to adjust the kinetic energy term of fluid, which is usually determined according to the flow state of fluid (such as laminar flow or turbulent flow). By using these parameters, the theoretical pressure difference under actual operating parameters can be calculated by Bernoulli equation, thus providing theoretical support for the operating state monitoring of the flap gate.

[0056] Preferably, in order to more accurately calculate the theoretical pressure difference under actual operating parameters, the following steps can be taken: first, measure the instantaneous flow value by flow sensor, and calculate the flow rate of fluid by combining the opening area of the flap gate; second, measure or calculate the height difference between the two sides of the flap gate according to the actual installation position of the flap gate; then, use Bernoulli equation to calculate by combining the density of fluid, flow rate of fluid, gravitational acceleration and kinetic energy correction coefficient, etc. For example, assuming that the fluid density is 1000 kilograms per cubic meter, the flow rate of fluid is 5 meters per second, the gravitational acceleration is 9.8 meters per square second, the height difference between the two sides of the flap gate is 2 meters, and the kinetic energy correction coefficient is 1.0, the theoretical pressure difference can be calculated by inputting these parameters into Bernoulli equation. This method can effectively improve the calculation accuracy of the theoretical pressure difference, thus providing a more accurate theoretical basis for the operating state monitoring of the flap gate.

[0057] In some embodiments, the deviation of the second pressure difference from the first pressure difference is calculated by the following formula:

[0058] wherein, represents a measured displacement value corresponding to a theoretical pressure difference value under rated operating parameters, represents a theoretical pressure difference value of the flap door under actual operating parameters.

[0059] It should be noted that the deviation between the second pressure difference value and the first pressure difference value is calculated in this embodiment to evaluate the difference between the actual operating state and the rated operating state of the flap door. The first pressure difference value refers to a theoretical pressure difference value obtained by interpolation of the characteristic curve under the rated operating parameters of the flap door, which reflects the pressure state of the flap door under ideal working conditions. The second pressure difference value is a theoretical pressure difference value calculated based on the actual operating parameters (such as instantaneous flow, displacement, etc.) of the flap door, which reflects the pressure state of the flap door in actual operation. By calculating the deviation between the two pressure difference values, it can be determined whether the actual operation of the flap door deviates from the rated operating state, thereby providing a basis for subsequent operating state compensation and adjustment.

[0060] Specifically, the first pressure difference value is a theoretical value calculated based on the rated operating parameters and the operating characteristic curve of the flap door, which is closely related to the design parameters and characteristic curve of the flap door. The second pressure difference value is calculated based on the actual operating parameters (such as instantaneous flow, displacement, etc.) of the flap door, which reflects the real state of the flap door in actual operation. The deviation refers to the difference between the two pressure difference values, usually expressed in absolute value. The size of the deviation can be used to determine whether the actual operating state of the flap door is within the allowable error range. If the deviation is less than the set threshold, it is considered that the actual operating state of the flap door is consistent with the rated operating state; if the deviation is greater than the threshold, operating state compensation needs to be performed to adjust the actual operating parameters to approach the rated operating state.

[0061] Preferably, in order to more accurately calculate the deviation and perform operating state compensation, the following steps can be adopted: first, measure the actual operating parameters (such as instantaneous flow, displacement, etc.) of the flap door through sensors and calculate the second pressure difference value; second, calculate the first pressure difference value based on the rated operating parameters and the operating characteristic curve of the flap door; then, calculate the deviation between the second pressure difference value and the first pressure difference value, and compare it with the set threshold. For example, assuming that the first pressure difference value is 15 Pa, the second pressure difference value is 18 Pa, and the deviation is 3 Pa. If the set threshold is 5 Pa, it is considered that the deviation is within the allowable range; if the deviation is greater than 5 Pa, the actual operating parameters need to be adjusted through operating state compensation. This method can effectively monitor the operating state of the flap door and adjust it in time to ensure its stable operation.

[0062] In some embodiments, the parameter interpolation by operating state compensation to change the actual operating parameters to target operating parameters includes: When the monitoring system is built-in with multiple rated operating parameters of the flap door, the minimum deviation is selected from the deviation of the second pressure difference value and all the first pressure difference values, and the rated operating parameter corresponding to the minimum deviation is the rated operating parameter closest to the actual operating parameter, i.e., the target operating parameter; The actual operating parameter is changed to the target operating parameter through parameter interpolation by operating state compensation.

[0063] It should be noted that, in the present embodiment, the actual operating parameter is changed to the target operating parameter through parameter interpolation by operating state compensation, so as to automatically adjust the operating parameter when the actual operating state of the flap door deviates from the rated operating state, and make it closer to the ideal state. Operating state compensation is an adjustment mechanism, which adjusts the actual operating parameter to the target operating parameter through parameter interpolation, so as to ensure that the operating state of the flap door is more stable and reliable. This method can select the parameter closest to the actual operating state from the multiple rated operating parameters built-in in the monitoring system as the target operating parameter, and further optimize the operating state of the flap door.

[0064] Specifically, operating state compensation refers to the process of adjusting the actual operating parameter through a certain algorithm when the actual operating parameter of the flap door deviates from the rated operating parameter. Parameter interpolation is a mathematical method for estimating the value of unknown data points between known data points. In the present embodiment, the monitoring system is built-in with multiple rated operating parameters of the flap door, which are preset according to the design and experimental data of the flap door. When the deviation of the second pressure difference value from the first pressure difference value is calculated, the parameter closest to the actual operating parameter is selected from all the built-in rated operating parameters as the target operating parameter. The target operating parameter refers to the parameter closest to the ideal operating state under the existing conditions, and adjusting the actual operating parameter to be consistent with the target operating parameter can effectively improve the operating state of the flap door.

[0065] Preferably, in order to realize operating state compensation, the following steps can be adopted: first, calculate the deviation of the second pressure difference value from all the first pressure difference values; second, select the rated operating parameter with the minimum deviation from the multiple rated operating parameters built-in in the monitoring system as the target operating parameter; and third, adjust the actual operating parameter to the target operating parameter through a parameter interpolation algorithm. For example, it is assumed that three rated operating parameters are built-in in the monitoring system, corresponding to pressure difference values of 10 Pa, 15 Pa and 20 Pa, and the calculated second pressure difference value is 17 Pa. By calculating the deviation, it is found that the deviation from 15 Pa is the smallest, and therefore the rated operating parameter corresponding to 15 Pa is selected as the target operating parameter, and the actual operating parameter is adjusted through parameter interpolation. This method can effectively reduce the deviation of the operating state of the flap door, and ensure that it operates in the best state.

[0066] In some embodiments, the step of obtaining the interpolated pressure difference value corresponding to the target operating parameter comprises: obtaining a theoretical pressure difference value of the flap valve under the target operating parameter based on the measured displacement value, the pressure difference value, and the compensated total flow value.

[0067] It should be noted that the interpolated pressure difference value corresponding to the target operating parameter mentioned in this embodiment is to further accurately calculate the theoretical pressure difference value of the flap valve under the adjusted operating state after the operating state compensation. The target operating parameter refers to the ideal operating parameter that the actual operating parameter approaches after the operating state compensation adjustment. By combining the measured displacement value, the pressure difference value, and the compensated total flow value, the theoretical pressure difference value of the flap valve under the target operating parameter can be more accurately calculated, thereby providing more reliable operating state evaluation basis for the monitoring system.

[0068] Specifically, the target operating parameter refers to the parameter closest to the actual operating parameter selected from the multiple rated operating parameters built-in the monitoring system during the operating state compensation. It reflects the ideal operating state of the flap valve after adjustment. The measured displacement value refers to the displacement data of the flap valve actually measured by the displacement sensor, which is used to reflect the opening or closing degree of the flap valve. The pressure difference value refers to the pressure difference of the fluid on both sides of the flap valve, which is measured by the pressure sensor. The compensated total flow value refers to the flow value calculated according to the adjusted operating parameter after the operating state compensation, which considers various adjustment factors in the compensation process. Through these parameters, the interpolation method or related calculation formula can be used to obtain the theoretical pressure difference value of the flap valve under the target operating parameter.

[0069] Preferably, in order to more accurately calculate the theoretical pressure difference value under the target operating parameter, the following steps can be adopted: first, determine the target operating parameter according to the result of the operating state compensation; second, combine the measured displacement value and the pressure difference value, and the compensated total flow value, and calculate through the interpolation method or related calculation formula. For example, assuming that the flow under the target operating parameter is 10 cubic meters per second, the measured displacement value is 50 millimeters, and the pressure difference value is 15 Pa, these parameters can be input into the calculation model to obtain the theoretical pressure difference value of the flap valve under the target operating parameter. This method can effectively improve the calculation accuracy and ensure that the flap valve can stably operate under the adjusted operating state.

[0070] The above-mentioned embodiments of the present invention have the following beneficial effects: the present invention can improve the accuracy and reliability of flap door operating status monitoring. Through the coordinated measurement of the displacement sensor and the pressure sensor, combined with the matching calculation of the rated parameters and the operating characteristic curve, a reference for the theoretical pressure difference can be accurately obtained. By using instantaneous flow calculation and Bernoulli equation dynamic analysis, the fluid state under actual working conditions can be reflected in real time, and anomaly detection can be achieved through deviation comparison. When a significant deviation occurs, the parameter interpolation compensation mechanism can be automatically triggered to adjust the operating parameters to the optimal target value, thereby optimizing the control effect and reducing the need for manual adjustment.

[0071] In addition, this solution can enhance the system's adaptability to different operating conditions. Through the intelligent matching and selection of multiple sets of rated parameters, the closest target value can be quickly determined, improving compensation efficiency. The calculation method based on characteristic curve interpolation and proportional coefficient can simplify the parameter derivation process under complex working conditions, while the introduction of fluid flow rate formula and kinetic energy correction coefficient can further improve the accuracy of pressure difference calculation. Ultimately, this technology can ensure that the flap door maintains stable operation under variable operating conditions, reduce energy loss and equipment wear, and is suitable for fluid control scenarios in water conservancy, chemical industry, energy and other fields.

[0072] Example 2 like Figure 2 As shown. The flap door in this embodiment is opened and closed by a drive mechanism consisting of an oil cylinder, a connecting rod, and a crank. The oil cylinder is hydraulically driven to extend and retract, driving the connecting rod to move, and the crank converts the linear motion of the connecting rod into the rotational motion of the flap door. The clutch is used to cut off the connection between the drive mechanism and the flap door in an emergency. Pressure sensors P1 and P2 are installed on both sides of the flap door, and a displacement sensor S1 is installed on the oil cylinder piston rod to monitor the opening of the flap door in real time. The system achieves dynamic optimization of the operating status by monitoring the displacement of the oil cylinder, the pressure difference on both sides of the flap door, and the flow parameters.

[0073] The displacement sensor S1 is installed at the end of the cylinder piston rod to measure the extension and contraction of the cylinder. The cylinder displacement and the flap door opening (displacement value x) are mapped through the geometric relationship of the crank-connecting rod mechanism. The calculation formula is: x=L×sinθ; where L is the crank length and θ is the crank rotation angle, which is linearly related to the cylinder displacement.

[0074] Pressure sensors P1 and P2 are installed on the water-facing and water-receiving surfaces of the flap door respectively to measure the pressure difference ΔP on both sides. − .

[0075] According to the value x measured by the cylinder displacement sensor, combined with the rated operating parameters (design flow , design pressure difference Select the closest two curves from the tongue flap door operating characteristic curve library (corresponding to displacement ). Calculate the displacement ratio coefficient:

[0076] Interpolation to get the theoretical pressure difference under the rated parameters:

[0077] Based on the instantaneous flow and displacement , calculate the fluid flow rate:

[0078] Where, the opening area , fluid density , viscosity , correction coefficient .

[0079] Calculate the actual pressure difference by Bernoulli equation:

[0080] Assume the height difference , kinetic energy correction coefficient .

[0081] Calculate the deviation:

[0082] Set the threshold , the deviation exceeds the limit to trigger the compensation mechanism. The monitoring system selects the closest target from the built-in rated parameter library, adjusts the oil cylinder oil supply, , so that the compensated pressure difference is close to the target value.

[0083] Adjust the hydraulic system flow valve to reduce the oil supply, so that the oil cylinder displacement slowly increases to , reduce the opening degree of the tongue flap door, thereby reducing the flow and pressure difference.

[0084] If the deviation continues to exceed the limit, trigger the clutch to disconnect, lock the tongue flap door position, and prevent overload damage.

[0085] Recalculate after adjustment until the deviation is less than the threshold value, and output the stable parameters.

[0086] The above description is merely exemplary of some embodiments of the application and of the technology principle of the application. It is understood that the scope of the application is not limited to the specific combinations of technical features described above, and should also cover other technical solutions formed by any combination of the above technical features or equivalent features thereof without departing from the above inventive concept. For example, the above technical features can be replaced with technical features having similar functions disclosed in the embodiments of the application (but not limited to) to form technical solutions.

Claims

1. A method for monitoring the operating status of a flap door, characterized in that: The method comprises the following steps: Measuring the displacement of the flap door using a displacement sensor, measuring the pressure difference on both sides of the flap door using a pressure sensor, and obtaining a theoretical pressure difference corresponding to the measured displacement under the rated operating parameters based on the measured displacement and pressure difference, as well as the rated operating parameters and an operating characteristic curve of the flap door, as a first pressure difference; Calculating an instantaneous flow value of the flap door according to the actual operating parameters of the flap door and the measured displacement value; obtaining a theoretical pressure difference value of the flap door under the actual operating parameters as a second pressure difference value based on the instantaneous flow value and the measured displacement value; The deviation between the second pressure difference and the first pressure difference is calculated. If the deviation is less than a threshold, the monitoring system outputs the first pressure difference. Otherwise, parameter interpolation is performed through operating state compensation to change the actual operating parameters into target operating parameters, and the corresponding pressure difference after interpolation is obtained based on the target operating parameters.

2. The method for monitoring the operating status of a flap door according to claim 1, characterized in that: The theoretical pressure difference corresponding to the rated operating parameters is obtained as the first pressure difference through the following steps: Based on the measured displacement value and pressure difference value, the two closest operating characteristic curves are found through characteristic curve interpolation; Calculating a displacement proportionality coefficient based on the measured displacement value and the displacement values ​​corresponding to the two closest operating characteristic curves; The theoretical pressure difference corresponding to the displacement value measured by the flap door under the rated operating parameters is obtained based on the displacement proportionality coefficient and the theoretical pressure difference corresponding to the two closest operating characteristic curves.

3. The method for monitoring the operating status of a flap door according to claim 2, characterized in that: The displacement proportional coefficient is calculated using the following formula: in, represents the measured displacement value, and It indicates the displacement value corresponding to the two closest operating characteristic curves under rated operating parameters.

4. The method for monitoring the operating status of a flap door according to claim 2, wherein: The theoretical pressure difference corresponding to the displacement value measured by the flap door under the rated operating parameters is obtained as the first pressure difference by the following formula: in, and It indicates the pressure difference between the two closest operating characteristic curves under rated operating parameters.

5. The method for monitoring the operating status of a flap door according to claim 1, characterized in that: The theoretical pressure difference of the flap door under actual operating parameters obtained based on the instantaneous flow value and the measured displacement value includes: The fluid flow rate is obtained based on the instantaneous flow value and the measured displacement value, and the theoretical pressure difference under the condition of constant flow rate is obtained based on the fluid flow rate; Based on the actual operating parameters of the flap door and the density of the fluid, the theoretical pressure difference under the actual operating parameters is calculated using the Bernoulli equation.

6. The method for monitoring the operating status of a flap door according to claim 5, characterized in that: The fluid flow rate is obtained by the following equation: in, is the instantaneous flow value, is the opening area of ​​the flap door, is the fluid density, is the fluid viscosity, is the correction factor, is the measured displacement value.

7. The method for monitoring the operating status of a flap door according to claim 5, characterized in that: The theoretical pressure difference under actual operating parameters is calculated using the following Bernoulli equation: in, is the fluid density, is the fluid flow rate, is the acceleration due to gravity, is the height difference between the two sides of the flap door, is the kinetic energy correction factor.

8. The method for monitoring the operating status of a flap door according to claim 5, characterized in that: The deviation between the second pressure difference and the first pressure difference is calculated by the following formula: in, Indicates the theoretical pressure difference corresponding to the measured displacement value under rated operating parameters. Indicates the theoretical pressure difference of the flap door under actual operating parameters.

9. The method for monitoring the operating status of a flap door according to claim 1, characterized in that: The parameter interpolation by operating state compensation to change the actual operating parameters into target operating parameters includes: When the monitoring system includes multiple rated operating parameters of the flap door, a minimum deviation is selected from the deviations between the second pressure difference and all the first pressure differences, and the built-in rated operating parameter corresponding to the minimum deviation is the built-in rated operating parameter closest to the actual operating parameter, that is, the target operating parameter; Parameter interpolation is performed through operating state compensation so that the actual operating parameters become the target operating parameters.

10. The method for monitoring the operating status of a flap door according to claim 9, characterized in that: The pressure difference value corresponding to the interpolated value obtained based on the target operating parameter includes: The theoretical pressure difference corresponding to the flap door under the target operating parameters is obtained based on the measured displacement value, the pressure difference value and the compensated total flow value.

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