Water hammer effect eliminating method and system based on ultrasonic generator

Abstract

The invention relates to the field of pipeline system protection, and discloses a water hammer effect elimination method and system based on an ultrasonic generator, and the method comprises the steps: installing the ultrasonic generator in a pipeline, transmitting an ultrasonic signal, preliminarily analyzing the pressure change between adjacent pressure sensors on the inner wall of the pipeline through a signal processing unit, and screening out a pressure sudden change point; based on further analysis on the liquid flow rate and pressure of the screened pressure mutation point, related characteristics of the water hammer effect are identified to detect the occurrence of the water hammer effect, and according to the detection result, a control signal for starting the ultrasonic generator is generated and sent to the driving unit to trigger the ultrasonic generator to start so as to eliminate the water hammer effect. The original water hammer propagation velocity and the new water hammer propagation velocity of the pressure sudden change point are compared, the control effect of the ultrasonic generator on the water hammer effect is analyzed, errors of water hammer effect detection are reduced, the situation that the water hammer effect is small is accurately detected, and changes of the water hammer effect are controlled in real time.

Description

Technical Field

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

[0002] In liquid transportation pipeline systems, due to frequent opening and closing of valves, or due to unexpected power outages, sudden pump stops and other factors, the fluid in the pipeline will produce significant pressure fluctuations, namely the water hammer effect. This pressure wave propagates rapidly along the pipeline, forming a shock wave, which can easily cause damage to the pipeline, valves and other components. Existing water hammer suppression technologies mostly rely on passive methods such as buffers, potential energy storage devices or reserved protective space to eliminate water hammer impacts;

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

[0004] First, the existing methods for eliminating the water hammer effect mostly rely on passive protection, lack active monitoring and analysis of the pressure and liquid flow rate that affect the water hammer effect, cannot accurately detect and locate the specific location of the water hammer effect, and are 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 the loop feedback control, which limits its ability to achieve real-time control of the water hammer effect and is unable to respond to the water hammer effect quickly and accurately, resulting in the risk of water hammer effect causing damage to the pipeline system. Summary of the invention

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

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

[0008] S1: Install an ultrasonic generator at a key position on the pipeline to emit ultrasonic signals;

[0009] 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;

[0010] 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;

[0011] 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;

[0012] 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;

[0013] 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;

[0014] S7: Monitor the water hammer effect control effect of the pressure mutation point by using an ultrasonic generator.

[0015] Preferably, 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 ultrasonic signals of the ultrasonic generator through a preset program, thereby eliminating the water hammer effect by emitting ultrasonic signals through the ultrasonic generator.

[0016] Preferably, 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 the straight section, and the signal lines of the multiple pressure sensors and the orifice flowmeter are connected 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.

[0017] Preferably, 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 pressure changes 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.

[0018] Preferably, 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, 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, and compares the water hammer effect detection coefficient with the preset water hammer effect threshold value. , so as to determine whether water hammer effect occurs;

[0019] 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, represents the time lag coefficient between pressure and flow rate;

[0020] 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.

[0021] Preferably, 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.

[0022] Preferably, the original water hammer propagation speed of S6 refers to the speed at which the pressure mutation wave propagates along the pipeline due to the water hammer effect caused by the pressure mutation point in the pipeline system, which causes the fluid flow rate to change sharply; 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 of the equivalent physical properties of the fluid due to the presence of bubbles;

[0023] 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;

[0024] The specific calculation formula for the new water hammer propagation speed is: , represents the “extra” density contribution caused by the bubble cluster, represents the equivalent elastic modulus of the bubble phase, represents the volume fraction occupied by bubbles;

[0025] If the new water hammer propagation speed Significantly lower than the original water hammer propagation speed , it means 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 The original water hammer propagation speed If the values ​​are similar, the control effect of the ultrasonic generator is not obvious.

[0026] Preferably, 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.

[0027] 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 article anti-counterfeiting method based on local feature visual information, comprising:

[0028] Ultrasonic generator arrangement module: ultrasonic generators are installed at key positions of the pipeline to emit ultrasonic signals;

[0029] 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;

[0030] 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;

[0031] 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;

[0032] 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;

[0033] 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;

[0034] Control effect monitoring module: monitor the water hammer effect control effect of the pressure mutation point by using an ultrasonic generator.

[0035] Technical effects and advantages of the present invention:

[0036] The present invention installs an ultrasonic generator at a key position of a pipeline for emitting ultrasonic signals, collects the pressure and liquid flow rate in the pipeline in real time, transmits the collected pressure and liquid flow rate in the pipeline to a signal processing unit, preliminarily analyzes the pressure change between adjacent pressure sensors on the inner wall of the pipe by the signal processing unit, obtains a pressure mutation value, determines whether there is a pressure mutation point by the pressure mutation value, thereby screening out the pressure mutation point, further monitors and analyzes the liquid flow rate and pressure of the screened pressure mutation point by the signal processing unit, thereby identifying the relevant features of the water hammer effect, calculates the water hammer effect detection coefficient by analyzing the relevant features of the water hammer effect, further detects the occurrence of the water hammer effect, and generates a control signal for starting the ultrasonic generator according to the result of detecting the water hammer effect and sends it to the driving unit, The ultrasonic generator is triggered to start, 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 in 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 water hammer effect, the pressure mutation point caused by the water hammer effect can be accurately screened and located, which is conducive to reducing the error in 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 water hammer effect elimination effect and automatically executing loop feedback control, it can respond to the water hammer effect quickly and accurately, which is conducive 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a diagram of the method steps of the present invention.

[0038] Figure 2 It is a system structure block diagram of the present invention. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. In addition, the forms of the various structures recorded in the following embodiments are merely illustrative. The water hammer effect elimination method and system based on an ultrasonic generator involved in the present invention are not limited to the various structures recorded in the following embodiments. All other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0040] like Figure 1 The present embodiment provides a method for eliminating water hammer effect based on an ultrasonic generator, comprising:

[0041] S1: Ultrasonic generators are installed at key locations on the pipeline to emit ultrasonic signals.

[0042] In this embodiment, S1 selects key positions on the pipeline where water hammer effect is likely to occur, including elbows, valves and water pump outlets, installs ultrasonic generators at the selected key positions, and controls the emission frequency and ultrasonic signals of the ultrasonic generator through a preset program, thereby eliminating the water hammer effect by emitting ultrasonic signals through the ultrasonic generator.

[0043] It should be specifically explained that for the installation of the ultrasonic generator, first, it is necessary to clean the dirt and rust on the inner and outer surfaces of the pipeline at the installation location to ensure that the installation surface is flat, and then locate it at key positions of the pipeline (such as elbows, valves, and water pump outlets) according to the design plan. Next, install the bracket or fixing device of the ultrasonic generator at the positioning point, fix the ultrasonic generator on the bracket, and connect it to the power supply and control unit, and then seal the installation part; when the water hammer effect is detected, control the ultrasonic generator to send ultrasonic waves to the pipe wall, and use the principle of ultrasonic waves to generate bubbles in the liquid (cavitation effect) to change the local density and elastic modulus of the liquid, thereby actively dissipating the water hammer pressure wave and achieving the purpose of quickly eliminating the water hammer effect; for large or long-distance pipelines, ultrasonic generators can be installed in multiple locations, and the control module, including the signal processing unit and the drive unit, will start them in a unified and coordinated manner to form a coordinated cavitation group coverage.

[0044] 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.

[0045] In this embodiment, S2 is used to monitor and collect pressure data at different positions in the pipeline by deploying multiple pressure sensors on the inner wall of the pipeline respectively, and is used to monitor and collect liquid flow rate data in the pipeline by installing the orifice flowmeter on the inner wall of the pipeline between two pressure sensors at a position on the straight section, and the signal lines of the multiple pressure sensors and the orifice flowmeter are connected 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.

[0046] It should be specifically explained that, for the installation process of the pressure sensor: by selecting multiple positions on the inner wall of the pipeline that are easy to detect and can represent the pressure status of the entire pipeline, a hole matching the interface of the pressure sensor is opened at each selected position, the pressure sensor is inserted into the hole, sealed with a sealing material, and the pressure sensor is fixed to the pipeline with screws, and then the signal line of the pressure sensor is led out of the pipeline, and a sealing protection is performed. At the same time, check whether the sealing state of the sensor is good; for the installation process of the orifice flowmeter: in the straight section of the pipeline between two adjacent pressure sensors, a position upstream or downstream of the straight section is selected, and a hole is opened according to the size of the orifice flowmeter, and the orifice flowmeter is installed and fixed at the opening in the pipeline, so that the measuring probe of the orifice flowmeter is consistent with the flow direction of the fluid, and the signal line of the orifice flowmeter is led out of the pipeline and insulated; the signal lines of all pressure sensors and orifice flowmeters are arranged along the pipeline and connected to the signal processing unit, the sensor parameters are configured on the signal processing unit, and the sensor is calibrated to ensure that the data can be transmitted and processed in real time, thereby realizing real-time data collection and monitoring.

[0047] S3: Preliminarily analyze the pressure changes between adjacent pressure sensors on the inner wall of the tube through the signal processing unit to obtain the pressure mutation value, and determine 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.

[0048] In this embodiment, 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 pressure changes 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.

[0049] It should be specifically stated that the specific analysis method for pressure mutation detection is:

[0050] 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 A at time t;

[0051] 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;

[0052] Step S313: By comparing the instantaneous pressure difference Difference from mean pressure The pressure mutation value is calculated as ;

[0053] 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 changes detected at this time are screened out, and at the same time, all the positions with pressure changes are located and marked;

[0054] By marking the screened pressure mutation points, it is helpful to identify and locate the positions of the pressure mutation points at any time.

[0055] S4: The liquid flow rate and pressure of the screened pressure mutation points are further monitored and analyzed by the signal processing unit to identify 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.

[0056] In this embodiment, the S4 monitors the flow rate at the pressure mutation point in real time, records the change data of the flow rate over time, observes the fluctuation of pressure and flow rate, and calculates the water hammer effect detection coefficient by analyzing the time series relationship between the pressure change and flow rate change and the occurrence of the water hammer effect. The water hammer effect detection coefficient is compared with the preset water hammer effect threshold. , so as to determine whether water hammer effect occurs;

[0057] 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, represents the time lag coefficient between pressure and flow rate;

[0058] 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.

[0059] It should be specifically noted that 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 can be identified, including 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;

[0060] The specific analysis steps for the water hammer effect detection coefficient are:

[0061] Step 1: Calculate the pressure change rate at the pressure mutation point: , Indicates that the pressure mutation point is The pressure value measured at the time, Indicates that the pressure mutation point is The pressure value measured at the time, and Indicates two adjacent moments;

[0062] Step 2: Calculate the liquid flow rate change rate at the pressure mutation point: , Indicates that the pressure mutation point is The liquid flow rate measured at the time, Indicates that the pressure mutation point is The liquid flow rate measured at the time;

[0063] 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 jth measured pressure value of the pressure mutation point, Indicates the average pressure value of the pressure mutation point. represents the liquid flow rate measured at the jth pressure mutation point, Indicates the average flow rate of the liquid at the pressure mutation point;

[0064] 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 pressure and flow rate as , represents the pressure value of the pressure mutation point at time t, Indicates that the liquid flow rate series is delayed in time The flow rate under Indicates the delay time of flow rate change relative to pressure change;

[0065] Step 5: The water hammer effect detection coefficient H is calculated based on the pressure change rate of the pressure mutation point, the liquid flow rate change rate, the correlation coefficient between the pressure and flow rate changes, and the time lag coefficient between the pressure and flow rate.

[0066] S5: Based on sending the control signal generated by the signal processing unit to the driving unit, the ultrasonic generator is triggered to start, thereby eliminating the water hammer effect.

[0067] In this embodiment, 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.

[0068] It should be specifically explained that 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 and 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.

[0069] S6: It is 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.

[0070] In this embodiment, the original water hammer propagation speed of S6 refers to the speed at which the pressure mutation wave propagates along the pipeline due to the water hammer effect caused by the pressure mutation point in the pipeline system, which causes the fluid flow rate to change sharply; 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, which changes the equivalent physical properties of the fluid due to the presence of bubbles;

[0071] 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;

[0072] The specific calculation formula for the new water hammer propagation speed is: , represents the “extra” density contribution caused by the bubble cluster, represents the equivalent elastic modulus of the bubble phase, represents the volume fraction occupied by bubbles;

[0073] If the new water hammer propagation speed Significantly lower than the original water hammer propagation speed , it means 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 The original water hammer propagation speed If the values ​​are similar, the control effect of the ultrasonic generator is not obvious.

[0074] It should be noted that the bulk 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 container , and measure the resulting volume change , and specifically calculate the bulk elastic modulus of the liquid , A represents the initial volume of the liquid.

[0075] S7: Monitor the water hammer effect control effect of the pressure mutation point by using an ultrasonic generator.

[0076] In this embodiment, 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.

[0077] like Figure 2 The embodiment shown provides an implementation system corresponding to the water hammer effect elimination method based on an ultrasonic generator, including an ultrasonic 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, wherein the ultrasonic 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.

[0078] The ultrasonic generator arrangement module is used to transmit ultrasonic signals by installing ultrasonic generators at key positions of the pipeline;

[0079] 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;

[0080] 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 a pressure mutation value, and determines 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 the water hammer effect detection module;

[0081] 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 relevant features of the water hammer effect, and by analyzing the relevant features of the water hammer effect, calculates the water hammer effect detection coefficient 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;

[0082] The signal trigger module triggers 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;

[0083] The control effect comparison module is 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;

[0084] The control effect monitoring module monitors the water hammer effect control effect of the pressure mutation point by using an ultrasonic generator.

[0085] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0086] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

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 pressure mutation point by using an ultrasonic generator.

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 likely to occur, including elbows, valves and water pump outlets, installs ultrasonic generators at the selected key positions, and controls the emission frequency and 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 3 is characterized in that: Based on the pressure data in the pipeline uploaded to the signal processing unit, S3 records the pressure data synchronously collected by all adjacent sensors at the same time point, and analyzes the difference in pressure changes 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.

5. The method for eliminating water hammer effect based on ultrasonic generator according to claim 4 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; 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, represents the time lag coefficient between pressure and flow rate; 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 5, 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 6 is characterized in that: The original water hammer propagation speed of S6 refers to the speed at which the pressure mutation wave propagates along the pipeline due to the water hammer effect caused by the pressure mutation point in the pipeline system, which causes the fluid flow rate to change sharply; 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 of the equivalent physical properties of the fluid due to 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 "extra" 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 , it means 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 The original water hammer propagation speed If the values ​​are similar, the control effect of the ultrasonic generator is not obvious.

8. The method for eliminating water hammer effect based on ultrasonic generator according to claim 7, 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.

9. 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 8, 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.

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