A Method and System for Eliminating Water Hammer Effect Based on an Ultrasonic Generator

Abstract

The present invention relates to the field of pipeline system protection, and discloses a method and system for eliminating water hammer effect based on an ultrasonic generator. By installing an ultrasonic generator in a pipeline to emit ultrasonic signals, the signal processing unit preliminarily analyzes the pressure changes between adjacent pressure sensors on the inner wall of the pipe, screens out the pressure mutation points, and further analyzes the liquid flow velocity and pressure of the screened pressure mutation points to identify the relevant characteristics related to the water hammer effect, so as to detect the occurrence of the water hammer effect. According to the detection result, a control signal for starting the ultrasonic generator is generated and sent to the driving unit to trigger the start of the ultrasonic generator to eliminate the water hammer effect. Then, the original water hammer propagation speed and the new water hammer propagation speed at the pressure mutation point are compared to analyze the control effect of the ultrasonic generator on the water hammer effect, which is beneficial to reducing the error of water hammer effect detection, accurately detecting the situation with a small water hammer effect, and real-time controlling the change of the water hammer effect.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline system protection, and more particularly to a method and system for eliminating water hammer effect based on an ultrasonic generator. Background Art

[0002] In a liquid transportation pipeline system, due to the frequent opening and closing of valves, or factors such as unexpected power outages and sudden pump stops, significant pressure fluctuations will occur in the pipeline fluid, namely the water hammer effect (waterhammer). This pressure wave propagates rapidly along the pipeline, forming a shock wave, which is extremely likely to cause damage to pipelines, valves and other components. Existing water hammer suppression technologies mostly rely on passive methods such as buffers, potential energy storage devices or relying on reserved protection spaces to eliminate water hammer impacts;

[0003] However, the above process still has the following disadvantages:

[0004] Firstly, most of the existing methods for eliminating the water hammer effect rely on passive protection, lacking active monitoring and analysis of the pressure and liquid flow rate that affect the generation of the water hammer effect, unable to accurately detect and locate the specific position where the water hammer effect occurs, difficult to achieve precision control, and may not be able to completely eliminate the water hammer effect;

[0005] Secondly, the existing methods for eliminating the water hammer effect have deficiencies in the evaluation of the water hammer effect elimination effect and cyclic feedback control, thus limiting their ability to achieve real-time control of the water hammer effect, unable to respond quickly and accurately to the water hammer effect, resulting in the risk that the water hammer effect causes damage to the pipeline system still existing. Summary of the Invention

[0006] In order to overcome the above defects of the prior art, the present invention provides a method and system for eliminating the water hammer effect based on an ultrasonic generator to solve the problems existing in the above background art.

[0007] The present invention provides the following technical solutions: A method for eliminating the water hammer effect based on an ultrasonic generator, comprising:

[0008] S1: Installing an ultrasonic generator at a key position of the pipeline for transmitting ultrasonic signals;

[0009] S2: For real-time collecting the pressure and liquid flow rate in the pipeline, and transmitting the collected pressure and liquid flow rate in the pipeline to a signal processing unit;

[0010] S3: Initially analyzing the pressure change between adjacent pressure sensors on the inner wall of the pipe through the signal processing unit to obtain a pressure mutation value, judging whether there is a pressure mutation point through the pressure mutation value, thereby screening out the pressure mutation point, and transmitting the pressure analysis result of the pressure mutation point to S4;

[0011] S4: Further monitor and analyze the liquid flow rate and pressure at the selected pressure mutation points by the signal processing unit, so as to identify the relevant characteristics related to the water hammer effect. By analyzing the relevant characteristics of the water hammer effect, calculate the water hammer effect detection coefficient to further detect whether the water hammer effect occurs. If it is detected that the water hammer effect occurs, generate a control signal to start the ultrasonic generator.

[0012] S5: Based on sending the control signal generated by the signal processing unit to the driving unit, trigger the start of the ultrasonic generator, thereby eliminating the water hammer effect.

[0013] S6: Used to compare the original water hammer propagation speed and the new water hammer propagation speed at the pressure mutation points in the pipeline, so as to analyze the control effect of the ultrasonic generator on the water hammer effect.

[0014] S7: Monitor the control effect of the ultrasonic generator on the water hammer effect at the pressure mutation points.

[0015] Preferably, in S1, select key positions on the pipeline where the water hammer effect is likely to occur, including elbows, valves, and the pump outlet. Install the ultrasonic generator at the selected key positions, and control the emission frequency and ultra-strong ultrasonic signal of the ultrasonic generator through a preset program. Eliminate the water hammer effect by the ultrasonic generator emitting ultrasonic signals.

[0016] Preferably, in S2, deploy multiple pressure sensors on the inner wall of the pipeline respectively to monitor and collect the pressure data at different positions in the pipeline. Install the orifice flowmeter at the position of the straight section on the inner wall of the pipeline between two pressure sensors to monitor and collect the liquid flow rate data in the pipeline, and connect the signal lines of the multiple pressure sensors and the orifice flowmeter to the signal processing unit, so as to input the collected pressure and liquid flow rate in the pipeline into the signal processing unit in real time.

[0017] Preferably, in S3, based on the pressure data in the pipeline uploaded to the signal processing unit, record the pressure data synchronously collected by all adjacent sensors at the same time point, and analyze the difference in the pressure change over time of the adjacent pressure sensors at the same time point, so as to judge the pressure mutation points and screen out the positions at risk of the water hammer effect.

[0018] The specific analysis method of the pressure difference is as follows:

[0019] Step S311: Analyze and calculate the pressure difference between adjacent pressure sensors at the same time point as , represents the pressure measured by the pressure sensor A1 at time t, represents the pressure measured by the pressure sensor A2 adjacent to A at time t.

[0020] Step S312: Calculate the average pressure difference measured by two adjacent pressure sensors over a period of time as , represents the pressure measured by pressure sensor A1 for the i-th time, represents the pressure measured by pressure sensor A2 for the i-th time, and N represents the total number of pressure measurements;

[0021] Step S313: By comparing the instantaneous pressure difference and the average pressure difference between them, calculate the pressure mutation value as ;

[0022] By setting a pressure mutation threshold , compare the pressure mutation value with the pressure mutation threshold to determine whether the pressure at the position between two adjacent pressure sensors has undergone a pressure mutation. If the pressure mutation value the pressure mutation threshold , it indicates that there is no pressure mutation at the position between the adjacent pressure sensors, and continue to monitor it. If the pressure mutation value the pressure mutation threshold , it indicates that the pressure at the position between the adjacent pressure sensors has undergone a mutation, and screen out all the positions where pressure mutations are detected at this time. At the same time, locate and mark all the positions where pressure mutations occur.

[0023] Preferably, in S4, by real-time monitoring the flow rate at the pressure mutation point, recording the change data of the flow rate over time, observing the fluctuation conditions of the pressure and the flow rate, and analyzing the time series relationship between the pressure change and the flow rate change and the occurrence of the water hammer effect, calculate the water hammer effect detection coefficient, and compare the water hammer effect detection coefficient with the preset water hammer effect threshold to determine whether the water hammer effect occurs;

[0024] The specific calculation formula of the water hammer effect detection coefficient is , where r represents the correlation coefficient between the pressure change and the flow rate change, represents the pressure change rate, represents the pressure change threshold, represents the liquid flow rate change rate, represents the liquid average flow rate, represents the lag time;

[0025] If the water hammer effect detection coefficient H the preset water hammer effect threshold , indicating further analysis of the pressure mutation point, no water hammer effect is detected, and continuous monitoring and analysis are continued. If the water hammer effect detection coefficient H The preset water hammer effect threshold , indicating that the occurrence of the water hammer effect is detected at the monitored pressure mutation point, and a control signal to start the ultrasonic generator is immediately generated.

[0026] Preferably, based on the control signal for starting the ultrasonic generator generated by the signal processing unit, S5 instructs the drive unit to start the ultrasonic generator and send ultrasonic waves to the pipe wall.

[0027] Preferably, the original water hammer propagation speed in S6 refers to the speed at which the pressure mutation wave formed by the water hammer effect caused by the pressure mutation point in the pipeline system causes a sharp change in the fluid flow velocity and then propagates along the pipeline; the new water hammer propagation speed refers to the speed at which the water hammer wave propagates in the pipeline after the ultrasonic generator is started, due to the presence of bubbles changing the equivalent physical properties of the fluid.

[0028] The specific calculation formula for the original water hammer propagation speed is , K represents the bulk modulus of elasticity of the liquid, represents the liquid density;

[0029] The specific calculation formula for the new water hammer propagation speed is , represents the "extra" density contribution value caused by the bubble group, represents the equivalent elastic modulus of the bubble phase, represents the volume fraction of the bubbles;

[0030] If the new water hammer propagation speed is significantly lower than the original water hammer propagation speed , it indicates that the ultrasonic generator effectively reduces the propagation speed of the water hammer wave, thereby reducing the pressure shock and achieving the purpose of controlling the water hammer effect; if the new water hammer propagation speed is close to the original water hammer propagation speed , the control effect of the ultrasonic generator is not obvious.

[0031] Preferably, S7 monitors the control effect of the water hammer effect at the pressure mutation point in real time. If the monitored control effect reaches the expected state, the current control parameters are maintained. If it is continuously monitored that the control effect has no obvious change, the control parameters are adjusted according to the machine learning algorithm, and the control effect of the water hammer effect is compared and analyzed again.

[0032] To achieve the above object, the present invention provides the following technical solution: An article anti-counterfeiting system based on local feature visual information, implementing the above-mentioned article anti-counterfeiting method based on local feature visual information, includes:

[0033] Ultrasonic generator arrangement module: Install ultrasonic generators at key positions of the pipeline for emitting ultrasonic signals.

[0034] Data acquisition module: Used to collect the pressure and liquid flow rate in the pipeline in real time, and transmit the collected pressure and liquid flow rate in the pipeline to the signal processing unit.

[0035] Pressure mutation analysis module: Initially analyze the pressure change between adjacent pressure sensors on the inner wall of the pipe through the signal processing unit to obtain the pressure mutation value, determine whether there is a pressure mutation point through the pressure mutation value, thereby screen out the pressure mutation point, and transmit the pressure analysis result of the pressure mutation point to the water hammer effect detection module.

[0036] Water hammer effect detection module: Further monitor and analyze the liquid flow rate and pressure of the screened pressure mutation points through the signal processing unit to identify the relevant characteristics related to the water hammer effect. Analyze the relevant characteristics of the water hammer effect to calculate the water hammer effect detection coefficient to further detect whether the water hammer effect occurs. If the water hammer effect is detected, generate a control signal to start the ultrasonic generator.

[0037] Signal trigger module: Based on sending the control signal generated by the signal processing unit to the driving unit, trigger the start of the ultrasonic generator to eliminate the water hammer effect.

[0038] Control effect comparison module: Used to compare the original water hammer propagation speed and the new water hammer propagation speed at the pressure mutation point in the pipeline, thereby analyzing the control effect of the ultrasonic generator on the water hammer effect.

[0039] Control effect monitoring module: Monitor the control effect of the ultrasonic generator on the water hammer effect at the pressure mutation point.

[0040] The technical effects and advantages of the present invention:

[0041] The present invention installs ultrasonic generators at key positions of a pipeline to emit ultrasonic signals. By collecting the pressure and liquid flow rate inside the pipeline in real time and transmitting the collected pressure and liquid flow rate inside the pipeline to a signal processing unit, the signal processing unit preliminarily analyzes the pressure change between adjacent pressure sensors on the inner wall of the pipeline to obtain a pressure mutation value. Whether there is a pressure mutation point is judged through the pressure mutation value, so as to screen out the pressure mutation point. The signal processing unit further monitors and analyzes the liquid flow rate and pressure of the screened pressure mutation point, so as to identify the relevant characteristics related to the water hammer effect. By analyzing the relevant characteristics related to the water hammer effect, a water hammer effect detection coefficient is calculated to further detect the occurrence of the water hammer effect. According to the result of detecting the water hammer effect, a control signal for starting the ultrasonic generator is generated and sent to a driving unit to trigger the start of the ultrasonic generator, thereby eliminating the water hammer effect. By comparing the original water hammer propagation speed and the new water hammer propagation speed at the pressure mutation point inside the pipeline, the control effect of the ultrasonic generator on the water hammer effect is analyzed. By monitoring the control effect of the ultrasonic generator on the water hammer effect at the pressure mutation point, and actively monitoring and analyzing the pressure and liquid flow rate that affect the generation of the water hammer effect, the pressure mutation point generated by the water hammer effect can be accurately screened and located, which is beneficial to reducing the error of water hammer effect detection and accurately detecting the situation where the water hammer effect is small, and can completely eliminate the water hammer effect. By evaluating the elimination effect of the water hammer effect and automatically executing cyclic feedback control, the water hammer effect can be quickly and accurately responded to, which is beneficial to real-time control of the change of the water hammer effect, thereby reducing the risk of damage to the pipeline system caused by the water hammer effect. Description of the Drawings

[0042] Figure 1 It is a method step diagram of the present invention.

[0043] Figure 2 It is a system structure block diagram of the present invention. Detailed Embodiment

[0044] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the drawings in the present invention. In addition, the forms of each structure described in the following embodiments are only examples. A method and system for eliminating water hammer effect based on an ultrasonic generator involved in the present invention are not limited to the structures described in the following embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0045] As Figure 1 shown, this embodiment provides a method for eliminating water hammer effect based on an ultrasonic generator, including:

[0046] S1: Install an ultrasonic generator at key positions of the pipeline to emit ultrasonic signals.

[0047] In this embodiment, in S1, key positions prone to water hammer effects are selected on the pipeline, including elbows, valves, and the pump outlet. The ultrasonic generator is installed at the selected key positions, and the emission frequency and extremely strong ultrasonic signals of the ultrasonic generator are controlled through a preset program. The ultrasonic generator emits ultrasonic signals to eliminate the water hammer effect.

[0048] Specifically, for the installation of the ultrasonic generator, first, the dirt and rust on the inner and outer surfaces of the pipeline at the installation position need to be cleaned to ensure the installation surface is flat. Then, according to the design scheme, key positions of the pipeline (such as elbows, valves, pump outlets) are located. Next, a bracket or fixing device for the ultrasonic generator is installed at the positioning point, the ultrasonic generator is fixed on the bracket, and connected to the power supply and the control unit. Then, the installation part is sealed. When a water hammer effect is detected, the ultrasonic generator is controlled to send ultrasonic waves to the pipe wall. Using the principle that ultrasonic waves generate bubbles (cavitation effect) in the liquid, the local density and elastic modulus of the liquid are changed, so as to actively dissipate the water hammer pressure wave and achieve the purpose of quickly eliminating the water hammer effect. For large or long-distance pipelines, ultrasonic generators can be installed at multiple locations and uniformly coordinated and started by a control module, including a signal processing unit and a driving unit, to form a coordinated cavitation cluster coverage.

[0049] S2: Collect the pressure and liquid flow rate in the pipeline in real time and transmit the collected pressure and liquid flow rate in the pipeline to the signal processing unit.

[0050] In this embodiment, in S2, multiple pressure sensors are respectively deployed on the inner wall of the pipeline to monitor and collect pressure data at different positions in the pipeline. The orifice flowmeter is installed at a straight-line section position on the inner wall of the pipeline between two pressure sensors to monitor and collect the liquid flow rate data in the pipeline. The signal lines of the multiple pressure sensors and the orifice flowmeter are connected to the signal processing unit, so as to input the pressure and liquid flow rate in the pipeline collected in real time into the signal processing unit.

[0051] Specifically, for the installation process of the pressure sensor: select multiple positions on the inner wall of the pipeline that are easy to detect and can represent the pressure conditions of the entire pipeline. At each selected position, drill a hole that matches the interface of the pressure sensor, insert the pressure sensor into the hole, seal it with a sealing material, and fix the pressure sensor on the pipeline with screws. Then, lead out the signal wire of the pressure sensor from the pipeline and provide good sealing protection. At the same time, check whether the sealing state of the sensor is good. For the installation process of the orifice flowmeter: at the straight section of the pipeline between two adjacent pressure sensors, select a position upstream or downstream of the straight section, drill a hole according to the size of the orifice flowmeter, install and fix the orifice flowmeter at the drilled hole in the pipeline, ensure that the measuring probe of the orifice flowmeter is consistent with the fluid flow direction, lead out the signal wire of the orifice flowmeter from the pipeline, and provide good insulation protection. Arrange the signal wires of all pressure sensors and orifice flowmeters along the pipeline and connect them to the signal processing unit. Configure the sensor parameters on the signal processing unit and calibrate the sensors to ensure that data can be transmitted and processed in real time, so as to realize real-time data acquisition and monitoring.

[0052] S3: Initially analyze the pressure change between adjacent pressure sensors on the inner wall of the pipe through the signal processing unit to obtain the pressure mutation value. Determine whether there is a pressure mutation point based on the pressure mutation value, thereby screening out the pressure mutation point, and transmitting the pressure analysis result of the pressure mutation point to S4.

[0053] In this embodiment, S3 records the pressure data synchronously collected by all adjacent sensors at the same time point based on the pressure data in the pipeline uploaded to the signal processing unit, and analyzes the difference in the pressure change over time of adjacent pressure sensors at the same time point, thereby determining the pressure mutation point and screening out the positions at risk of water hammer effect.

[0054] The specific analysis method of the pressure difference is as follows:

[0055] Step S311: Analyze and calculate the pressure difference between adjacent pressure sensors at the same time point as , represents the pressure measured by pressure sensor A1 at time t, represents the pressure measured by pressure sensor A2 adjacent to A at time t;

[0056] Step S312: Calculate the average pressure difference measured by two adjacent pressure sensors over a period of time as , represents the pressure measured by pressure sensor A1 for the i-th time, represents the pressure measured by pressure sensor A2 for the i-th time, and N represents the total number of pressure measurements;

[0057] Step S313: By comparing the instantaneous pressure difference with the average pressure difference to calculate the pressure mutation value as ;

[0058] By setting a pressure mutation threshold to compare the pressure mutation value with the pressure mutation threshold to determine whether the pressure at the position between two adjacent pressure sensors has a pressure mutation. If the pressure mutation value < pressure mutation threshold, it indicates that there is no pressure mutation at the position between the adjacent pressure sensors, and continue to monitor it. If the pressure mutation value > pressure mutation threshold, it indicates that the pressure at the position between the adjacent pressure sensors has a mutation, and screen out all the positions where pressure mutations are detected at this time. At the same time, locate and mark all the positions where pressure mutations occur.

[0059] It should be specifically noted that by marking the screened pressure mutation points, it is beneficial to identify and locate the positions of the pressure mutation points at any time.

[0060] S4: Further monitor and analyze the liquid flow rate and pressure of the screened pressure mutation points through the signal processing unit, so as to identify the relevant characteristics related to the water hammer effect. By analyzing the relevant characteristics of the water hammer effect, calculate the water hammer effect detection coefficient to further detect whether the water hammer effect occurs. If it is detected that the water hammer effect occurs, generate a control signal to start the ultrasonic generator.

[0061] In this embodiment, S4 calculates the water hammer effect detection coefficient by monitoring the flow rate of the pressure mutation point in real time, recording the change data of the flow rate over time, observing the fluctuation of the pressure and the flow rate, and analyzing the time series relationship between the pressure change and the flow rate change and the occurrence of the water hammer effect, and comparing the water hammer effect detection coefficient with the preset water hammer effect threshold to determine whether the water hammer effect occurs;

[0062] The specific calculation formula of the water hammer effect detection coefficient is , where r represents the correlation coefficient between the pressure change and the flow rate change, represents the pressure change rate, represents the pressure change threshold, represents the liquid flow rate change rate, represents the average liquid flow rate, represents the lag time;

[0063] If the water hammer effect detection coefficient is H The preset water hammer effect threshold , it indicates that further analysis is to be carried out on the pressure mutation point, and the generation of the water hammer effect is not detected, and continuous monitoring and analysis are continued. If the water hammer effect detection coefficient H The preset water hammer effect threshold , it indicates that the occurrence of the water hammer effect is detected at the monitored pressure mutation point, and a control signal to start the ultrasonic generator is immediately generated.

[0064] Specifically, by analyzing the characteristics of the liquid flow rate and pressure monitored at the pressure mutation point, the relevant characteristics of the water hammer effect identified include the pressure change rate, the liquid flow rate change rate, the average liquid flow rate, the correlation coefficient between the pressure and flow rate changes, and the time lag coefficient between the pressure and flow rate;

[0065] The specific analysis steps for the water hammer effect detection coefficient are as follows:

[0066] Step 1: Calculate the pressure change rate of the pressure mutation point as , represents the pressure value measured at the pressure mutation point at time, represents the pressure value measured at the pressure mutation point at time, and represent two adjacent times;

[0067] Step 2: Calculate the liquid flow rate change rate of the pressure mutation point as , represents the liquid flow rate measured at the pressure mutation point at time, represents the liquid flow rate measured at the pressure mutation point at time;

[0068] Step 3: Use the Pearson correlation coefficient to analyze the correlation between the pressure and flow rate changes at the pressure mutation point, and calculate the correlation coefficient between the pressure and flow rate changes as , represents the pressure value of the jth measurement at the pressure mutation point, represents the average pressure value at the pressure mutation point, represents the liquid flow rate of the jth measurement at the pressure mutation point, represents the average liquid flow rate at the pressure mutation point;

[0069] Step 4: Use the cross-correlation function to analyze the time lag between the pressure and flow rate changes at the pressure mutation point, and calculate the time lag coefficient between the pressure and flow rate as , represents the pressure value at the pressure mutation point at time t, represents the flow velocity of the liquid flow velocity sequence at a time lag of , represents the delay time of the flow velocity change relative to the pressure change;

[0070] Step 5: Based on the pressure change rate of the pressure mutation point, the liquid flow velocity change rate, the correlation coefficient between the pressure and flow velocity changes, and the lag time determined by the time lag coefficient between the pressure and flow velocity, perform a comprehensive analysis to calculate the water hammer effect detection coefficient H.

[0071] S5: Based on sending the control signal generated by the signal processing unit to the driving unit to trigger the start of the ultrasonic generator, thereby eliminating the water hammer effect.

[0072] In this embodiment, the S5 is based on the control signal for starting the ultrasonic generator generated by the signal processing unit, instructing the driving unit to start the ultrasonic generator and send ultrasonic waves to the pipe wall.

[0073] Specifically, the signal processing unit sends the control signal for starting the ultrasonic generator to the driving unit through the serial communication interface. After receiving the control signal, the driving unit decodes the signal. After decoding, it sends a start signal to the ultrasonic generator. When the ultrasonic generator receives the start signal, it immediately sends ultrasonic waves to the pipe wall.

[0074] S6: Used to compare the original water hammer propagation speed and the new water hammer propagation speed at the pressure mutation point in the pipeline, so as to analyze the control effect of the ultrasonic generator on the water hammer effect.

[0075] In this embodiment, the original water hammer propagation speed in the S6 refers to the speed at which the pressure mutation wave caused by the water hammer effect triggered by the pressure mutation point propagates along the pipeline due to the sudden change in the fluid flow velocity in the pipeline system; the new water hammer propagation speed refers to the speed at which the water hammer wave propagates in the pipeline after the ultrasonic generator is started, because the presence of bubbles changes the equivalent physical properties of the fluid.

[0076] The specific calculation formula for the original water hammer propagation speed is , where K represents the bulk modulus of elasticity of the liquid, represents the liquid density;

[0077] The specific calculation formula for the new water hammer propagation speed is , represents the "extra" density contribution value caused by the bubble group, represents the equivalent elastic modulus of the bubble phase, represents the volume fraction of the bubbles;

[0078] If the new water hammer propagation speed is significantly lower than the original water hammer propagation speed , it indicates that the ultrasonic wave generator effectively reduces the propagation speed of the water hammer wave, thereby reducing the pressure shock and achieving the purpose of controlling the water hammer effect; if the new water hammer propagation speed is close to the original water hammer propagation speed , the control effect of the ultrasonic wave generator is not obvious.

[0079] It should be specifically noted that the volume elastic modulus K of the liquid can be determined through specific experiments. The specific experimental steps include: usually using an adjustable pressure vessel to test the compressibility of the liquid, applying a known small pressure change in the vessel, and measuring the resulting volume change , and specifically calculating the volume elastic modulus of the liquid , where A represents the initial volume of the liquid.

[0080] S7: Monitor the control effect of the water hammer effect at the pressure mutation point by the ultrasonic wave generator.

[0081] In this embodiment, in S7, by monitoring the control effect of the water hammer effect at the pressure mutation point in real time, if it is monitored that the control effect reaches the expected state, the current control parameters are maintained; if it is continuously monitored that the control effect has no obvious change, the control parameters are adjusted according to the machine learning algorithm, and the control effect of the water hammer effect is compared and analyzed again.

[0082] As Figure 2 shown, this embodiment provides an implementation system corresponding to a method for eliminating the water hammer effect based on an ultrasonic wave generator, including an ultrasonic wave generator arrangement module, a data acquisition module, a pressure mutation analysis module, a water hammer effect detection module, a signal trigger module, a control effect comparison module, and a control effect monitoring module. The ultrasonic wave generator arrangement module is connected to the signal trigger module, the data acquisition module is connected to the pressure mutation analysis module, the pressure mutation analysis module is connected to the water hammer effect detection module, the water hammer effect detection module is connected to the signal trigger module, the signal trigger module is connected to the control effect comparison module, and the control effect comparison module is connected to the control effect monitoring module.

[0083] The ultrasonic wave generator arrangement module is used to emit ultrasonic signals by installing ultrasonic wave generators at key positions of the pipeline;

[0084] The data acquisition module is used to collect the pressure and liquid flow rate in the pipeline in real time and transmit the collected pressure and liquid flow rate in the pipeline to the signal processing unit;

[0085] The pressure mutation analysis module preliminarily analyzes the pressure change between adjacent pressure sensors on the inner wall of the pipe through the signal processing unit to obtain the pressure mutation value, determines whether there is a pressure mutation point based on the pressure mutation value, thereby screens out the pressure mutation point, and transmits the pressure analysis result of the pressure mutation point to the water hammer effect detection module;

[0086] The water hammer effect detection module further monitors and analyzes the liquid flow rate and pressure of the screened pressure mutation point through the signal processing unit, thereby identifying the characteristics related to the water hammer effect. By analyzing the characteristics related to the water hammer effect, the water hammer effect detection coefficient is calculated to further detect whether the water hammer effect occurs. If it is detected that the water hammer effect occurs, a control signal for starting the ultrasonic generator is generated;

[0087] The signal trigger module sends the control signal generated by the signal processing unit to the driving unit to trigger the start of the ultrasonic generator, thereby eliminating the water hammer effect;

[0088] The control effect comparison module is used to compare the original water hammer propagation speed and the new water hammer propagation speed at the pressure mutation point in the pipeline, thereby analyzing the control effect of the ultrasonic generator on the water hammer effect;

[0089] The control effect monitoring module monitors the control effect of the ultrasonic generator on the water hammer effect at the pressure mutation point.

[0090] Finally: The above is only the preferred embodiment of the present invention and is not used to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0091] The above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in this application, and all should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claimed rights.

Claims

1. A method for eliminating water hammer effect based on an ultrasonic generator, characterized in that: include: S1: Install an ultrasonic generator at a key position on the pipeline to emit ultrasonic signals; S2: used to collect the pressure and liquid flow rate in the pipeline in real time, and transmit the collected pressure and liquid flow rate in the pipeline to the signal processing unit; S3: Preliminarily analyzing the pressure changes between adjacent pressure sensors on the inner wall of the pipe through the signal processing unit to obtain a pressure mutation value, judging whether there is a pressure mutation point through the pressure mutation value, thereby screening out the pressure mutation point, and transmitting the pressure analysis result of the pressure mutation point to S4; S4: The liquid flow rate and pressure of the screened pressure mutation point are further monitored and analyzed by the signal processing unit, so as to identify the relevant features of the water hammer effect. By analyzing the relevant features of the water hammer effect, a water hammer effect detection coefficient is calculated to further detect whether the water hammer effect occurs. If the water hammer effect is detected, a control signal for starting the ultrasonic generator is generated; S5: triggering the start of the ultrasonic generator based on sending the control signal generated by the signal processing unit to the driving unit, thereby eliminating the water hammer effect; S6: used to compare the original water hammer propagation velocity and the new water hammer propagation velocity at the pressure mutation point in the pipeline, so as to analyze the control effect of the ultrasonic generator on the water hammer effect; S7: Monitor the water hammer effect control effect of the ultrasonic generator on the pressure mutation point; The specific calculation formula of the water hammer effect detection coefficient is: , where r represents the correlation coefficient between pressure and flow rate changes, represents the rate of change of pressure, Indicates the pressure change threshold, Indicates the rate of change of liquid flow rate, represents the average flow rate of the liquid, Indicates the delay time of flow rate change relative to pressure change; The original water hammer propagation speed of S6 refers to the speed at which the pressure mutation wave formed by the water hammer effect caused by the pressure mutation point propagates along the pipeline in the pipeline system; the new water hammer propagation speed refers to the propagation speed of the water hammer wave in the pipeline after the ultrasonic generator is started, due to the change in the equivalent physical properties of the fluid caused by the presence of bubbles; The specific calculation formula of the original water hammer propagation velocity is: , K represents the bulk elastic modulus of the liquid, Indicates the density of liquid; The specific calculation formula for the new water hammer propagation speed is: , represents the additional density contribution caused by the bubble group, represents the equivalent elastic modulus of the bubble phase, represents the volume fraction occupied by bubbles; If the new water hammer propagation speed Significantly lower than the original water hammer propagation speed , the purpose of controlling the water hammer effect is achieved; if the new water hammer propagation speed The original water hammer propagation speed If the values ​​are similar, the control effect of the ultrasonic generator is not obvious.

2. The method for eliminating water hammer effect based on ultrasonic generator according to claim 1 is characterized in that: The S1 selects key positions on the pipeline where water hammer effect is prone to occur, including elbows, valves and water pump outlets, installs ultrasonic generators at the selected key positions, and controls the emission frequency and super-strong ultrasonic signals of the ultrasonic generator through a preset program, thereby eliminating the water hammer effect by emitting ultrasonic signals through the ultrasonic generator.

3. The method for eliminating water hammer effect based on ultrasonic generator according to claim 1 is characterized in that: The S2 is used to monitor and collect pressure data at different positions in the pipeline by respectively deploying multiple pressure sensors on the inner wall of the pipeline, and is used to monitor and collect liquid flow rate data in the pipeline by installing an orifice flowmeter on the inner wall of the pipeline between two pressure sensors at a position on a straight section, and connecting the signal lines of the multiple pressure sensors and the orifice flowmeter to the signal processing unit, so that the collected pressure and liquid flow rate in the pipeline are input into the signal processing unit in real time.

4. The method for eliminating water hammer effect based on ultrasonic generator according to claim 1 is characterized in that: The S3 records the pressure data collected synchronously by all adjacent sensors at the same time point based on the pressure data in the pipeline uploaded to the signal processing unit, and analyzes the difference in the pressure change over time of adjacent pressure sensors at the same time point, so as to determine the pressure mutation point and screen out the location where the water hammer effect risk occurs; The specific analysis method of the pressure mutation value is: Step S311: Analyze and calculate the pressure difference of adjacent pressure sensors at the same time point: , represents the pressure measured by pressure sensor A1 at time t, represents the pressure measured by pressure sensor A2 adjacent to pressure sensor A1 at time t; Step S312: Calculate the average pressure difference measured by two adjacent pressure sensors over a period of time: , represents the pressure measured by pressure sensor A1 for the i-th time, represents the pressure measured by the pressure sensor A2 for the i-th time, and N represents the total number of pressure measurements; Step S313: By comparing the instantaneous pressure difference Difference from average pressure The pressure mutation value is calculated as ; Step S314: By setting a pressure mutation threshold , change the pressure mutation value Pressure mutation threshold Compare and determine whether there is a sudden pressure change between two adjacent pressure sensors. Pressure mutation threshold , it indicates that there is no sudden change in the pressure between the adjacent pressure sensors, and the pressure will continue to be monitored. Pressure mutation threshold , it indicates that the pressure at the position between the adjacent pressure sensors has changed suddenly, and all the positions with pressure mutations detected at this time are screened out. At the same time, all the positions with pressure mutations are located and marked.

5. The method for eliminating water hammer effect based on ultrasonic generator according to claim 1 is characterized in that: The S4 monitors the flow velocity at the pressure mutation point in real time, records the flow velocity change data over time, observes the fluctuation of pressure and flow velocity, and calculates the water hammer effect detection coefficient by analyzing the time series relationship between the pressure change and flow velocity change and the water hammer effect. , so as to determine whether water hammer effect occurs; If the water hammer effect detection coefficient H Preset water hammer threshold , indicating that further analysis of the pressure mutation point has not detected the occurrence of water hammer effect, and continuous monitoring and analysis will continue. If the water hammer effect detection coefficient H Preset water hammer threshold , indicating that the monitored pressure mutation point detects the occurrence of water hammer effect and immediately generates a control signal to start the ultrasonic generator.

6. The method for eliminating water hammer effect based on ultrasonic generator according to claim 1, characterized in that: The S5 instructs the driving unit to start the ultrasonic generator based on the control signal for starting the ultrasonic generator generated by the signal processing unit to send ultrasonic waves to the pipe wall.

7. The method for eliminating water hammer effect based on ultrasonic generator according to claim 1, characterized in that: The S7 monitors the control effect of the water hammer effect at the pressure mutation point in real time. If it is monitored that the control effect reaches the expected state, the current control parameters are maintained. If it is continuously monitored that there is no obvious change in the control effect, the control parameters are adjusted according to the machine learning algorithm, and the control effect of the water hammer effect is compared and analyzed again.

8. A water hammer effect elimination system based on an ultrasonic generator, implementing a water hammer effect elimination method based on an ultrasonic generator as claimed in any one of claims 1 to 7, characterized in that: include: Ultrasonic generator arrangement module: ultrasonic generators are installed at key positions of the pipeline to emit ultrasonic signals; Data acquisition module: used to collect the pressure and liquid flow rate in the pipeline in real time, and transmit the collected pressure and liquid flow rate in the pipeline to the signal processing unit; Pressure mutation analysis module: The signal processing unit preliminarily analyzes the pressure changes between adjacent pressure sensors on the inner wall of the pipe to obtain the pressure mutation value, and determines whether there is a pressure mutation point based on the pressure mutation value, thereby screening out the pressure mutation point, and transmitting the pressure analysis result of the pressure mutation point to the water hammer effect detection module; Water hammer effect detection module: The signal processing unit is used to further monitor and analyze the liquid flow rate and pressure of the screened pressure mutation points, thereby identifying the relevant features of the water hammer effect. By analyzing the relevant features of the water hammer effect, the water hammer effect detection coefficient is calculated to further detect whether the water hammer effect occurs. If the water hammer effect is detected, a control signal for starting the ultrasonic generator is generated; Signal trigger module: based on sending the control signal generated by the signal processing unit to the driving unit, triggering the start of the ultrasonic generator, thereby eliminating the water hammer effect; Control effect comparison module: used to compare the original water hammer propagation velocity and the new water hammer propagation velocity at the pressure mutation point in the pipeline, so as to analyze the control effect of the ultrasonic generator on the water hammer effect; Control effect monitoring module: monitor the water hammer effect control effect of the pressure mutation point by using an ultrasonic generator.

Images