Pulse valve performance testing method and system based on data analysis

Abstract

This invention relates to the field of mechanical valve testing technology, and proposes a data analysis-based pulse valve performance testing method and system, including: acquiring the total pressure and flow rate at the outlet of the distribution cylinder and the total pressure at the inlet of the pulse valve for one control signal cycle; obtaining the total pressure vector at the outlet of the distribution cylinder, the flow rate vector at the outlet of the distribution cylinder, and the total pressure vector at the inlet of the pulse valve; marking the ineffective and effective flow portions, and calculating the flow efficiency ratio of the pulse valve; calculating the center frequency of the decomposed signal based on the total pressure vector at the outlet of the distribution cylinder, synthesizing the decomposed signal based on the value of the center frequency, obtaining the deviated outlet total pressure vector, and calculating the pressure efficiency ratio of the pulse valve; calculating the pulse valve efficiency ratio, and obtaining the pulse valve performance test result corresponding to the control cycle based on the pulse valve efficiency ratio. This invention solves the problem that performance testing of electromagnetic pulse valves neglects the interaction between different performance parameters, which easily leads to misjudgment of the overall performance of the electromagnetic pulse valve.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical valve testing, and in particular to a pulse valve performance testing method and system based on data analysis. Background Art

[0002] Electromagnetic pulse valves are widely used in flow control in the industrial field. They are valves that instantly open and close the diaphragm to generate high-pressure pulses. During the performance test of the electromagnetic pulse valve, flow and pressure sensors are usually installed at the outlet and inlet of the pulse valve to collect pressure and flow, and the performance test of the electromagnetic pulse valve is carried out based on parameters such as the outlet pressure peak, outlet pressure rise rate, and outlet injection volume.

[0003] In the performance test process of electromagnetic pulse valve, generally a single performance parameter of the pulse valve is directly analyzed, ignoring the interaction between different performance parameters of the electromagnetic pulse valve, which can easily lead to the problem of misjudgment of the overall performance of the electromagnetic pulse valve. Summary of the invention

[0004] The present invention provides a pulse valve performance testing method and system based on data analysis to solve the problem that the performance test of the electromagnetic pulse valve ignores the interaction between different performance parameters, which easily leads to misjudgment of the overall performance of the electromagnetic pulse valve. The technical solution adopted is as follows:

[0005] In a first aspect, an embodiment of the present invention provides a pulse valve performance testing method based on data analysis, the method comprising the following steps:

[0006] Collect the total pressure and flow rate at the outlet of the gas cylinder and the total pressure at the inlet of the pulse valve in a control signal cycle, and obtain the total pressure sequence at the outlet of the gas cylinder, the flow rate sequence at the outlet of the gas cylinder and the total pressure sequence at the inlet of the pulse valve;

[0007] According to the flow extreme values ​​contained in the cylinder outlet flow sequence, determine the pulse valve opening extreme value moment and the pulse valve closing extreme value moment, mark the front mark point and the rear mark point of the pulse valve opening extreme value moment according to the derivative value of the pressure of the cylinder outlet flow before the pulse valve opening extreme value moment and the derivative value of the pressure of the cylinder outlet flow corresponding to the pulse valve opening extreme value moment, obtain the front mark point and the rear mark point of the pulse valve closing extreme value moment according to the pulse valve closing extreme value moment, mark the invalid flow part and the effective flow part according to all the front mark points and the rear mark points, and calculate the flow efficiency ratio of the pulse valve according to the invalid flow part and the effective flow part;

[0008] Decompose the outlet total pressure sequence of the cylinder to obtain a preset number of decomposition signals, calculate the center frequency of the decomposition signal according to the frequency spectrum of each decomposition signal, synthesize the decomposition signals according to the values ​​of the center frequencies of all decomposition signals, obtain the vibration-free outlet total pressure sequence, calculate the pressure energy efficiency ratio of the pulse valve according to the effective flow portion in the outlet flow sequence of the cylinder, the pulse valve inlet total pressure sequence and the vibration-free outlet total pressure sequence;

[0009] The pulse valve energy efficiency ratio is calculated according to the flow efficiency ratio and pressure energy efficiency ratio of the pulse valve, and the pulse valve performance test result corresponding to the control period is obtained according to the pulse valve energy efficiency ratio.

[0010] Furthermore, the method for obtaining the pulse valve opening extreme value time and the pulse valve closing extreme value time is:

[0011] Smoothing the derivative sequence of the flow rate sequence at the outlet of the cylinder, obtaining a smoothed flow rate derivative sequence of the flow rate derivative sequence, and obtaining a maximum value point in the smoothed flow rate derivative sequence;

[0012] The collection time corresponding to the largest maximum point in the smooth flow derivative sequence is recorded as the pulse valve opening extreme time of the smooth flow derivative sequence, and the collection time corresponding to the smallest minimum point in the smooth flow derivative sequence is recorded as the pulse valve closing extreme time of the smooth flow derivative sequence.

[0013] The method of marking the front mark point and the rear mark point of the pulse valve opening extreme moment according to the derivative value of the pressure of the cylinder outlet flow rate before the pulse valve opening extreme moment and the derivative value of the pressure of the cylinder outlet flow rate corresponding to the pulse valve opening extreme moment includes:

[0014] The derivative of the pressure of the outlet flow of the gas cylinder corresponding to the pulse valve opening extreme value moment is multiplied by the first preset threshold value to obtain the threshold peak value at the pulse valve opening extreme value moment;

[0015] In the adjacent moments before the pulse valve opening extreme moment, the latest moment of the derivative of the pressure of the cylinder outlet flow equal to the threshold peak value is recorded as the front mark point of the pulse valve opening extreme moment; in the adjacent moments after the pulse valve opening extreme moment, the earliest moment of the derivative of the pressure of the cylinder outlet flow equal to the threshold peak value is recorded as the back mark point of the pulse valve opening extreme moment.

[0016] Furthermore, the method for obtaining the invalid flow part and the valid flow part is:

[0017] The flow rate at the outlet of the cylinder corresponding to all the moments between the front mark point and the rear mark point of the pulse valve opening extreme moment is recorded as the invalid flow rate part;

[0018] The flow at the outlet of the cylinder corresponding to all the moments between the front mark point and the rear mark point of the pulse valve closing extreme value moment is recorded as the invalid flow part;

[0019] The gas flow data corresponding to all the moments between the rear mark point of the pulse valve opening extreme moment and the front mark point of the pulse valve closing extreme moment are recorded as the effective flow part.

[0020] Furthermore, the method for obtaining the flow efficiency ratio of the pulse valve is:

[0021] With the acquisition time as the horizontal coordinate and the flow rate of the sub-cylinder outlet included in the sub-cylinder outlet flow rate sequence as the vertical coordinate, a sub-cylinder outlet flow rate sequence curve graph is established, and the curve integral value of all invalid flow parts in the sub-cylinder outlet flow rate sequence curve graph is recorded as the invalid flow area, and the curve integral value of all valid flow parts in the sub-cylinder outlet flow rate sequence curve graph is recorded as the valid flow area;

[0022] The sum of the effective flow area and the invalid flow area is recorded as the total flow area, and the ratio of the effective flow area to the total flow area is recorded as the flow efficiency ratio of the pulse valve.

[0023] Furthermore, the method for obtaining the center frequency of the decomposed signal is:

[0024] Each data in the second row of the spectrum of the decomposed signal is used as the weight of the corresponding data in the first row of the spectrum of the decomposed signal, and all data in the first row of the spectrum of the decomposed signal are weighted summed to obtain the center frequency of the decomposed signal.

[0025] Furthermore, the decomposed signals are synthesized according to the values ​​of the center frequencies of all decomposed signals to obtain the vibration-free outlet total pressure sequence, including the specific method of:

[0026] The decomposed signals corresponding to the central frequencies less than the frequency threshold are synthesized into one signal to obtain the de-vibration outlet total pressure sequence.

[0027] Furthermore, the calculation method of the pressure energy efficiency ratio of the pulse valve is:

[0028] The effective flow part in the flow sequence of the cylinder outlet is used as the weight, and the total pressure data of the pulse valve inlet at the same collection time are weighted and summed to obtain the weighted total pressure at the pulse valve inlet;

[0029] Taking the effective flow part in the flow sequence of the cylinder outlet as the weight, weighted summing is performed on the values ​​corresponding to each effective flow part in the total pressure sequence of the vibration-free outlet to obtain the weighted total pressure of the pulse valve outlet;

[0030] The ratio of the weighted total pressure at the pulse valve outlet to the weighted total pressure at the pulse valve inlet is recorded as the pressure energy efficiency ratio of the pulse valve.

[0031] Further, the pulse valve energy efficiency ratio is calculated according to the flow efficiency ratio and pressure energy efficiency ratio of the pulse valve, and the pulse valve performance test result corresponding to the control period is obtained according to the pulse valve energy efficiency ratio, including the specific method of:

[0032] The product of the flow efficiency ratio and the pressure efficiency ratio of the pulse valve is recorded as the pulse valve energy efficiency ratio;

[0033] When the pulse valve energy efficiency ratio is greater than or equal to the energy efficiency threshold, the pulse valve is judged to have good performance; when the pulse valve energy efficiency ratio is less than the energy efficiency threshold, the pulse valve is judged to have poor performance.

[0034] In the second aspect, an embodiment of the present invention also provides a pulse valve performance testing system based on data analysis, including a memory, a processor, and a computer program stored in the memory and running on the processor, and the processor implements the steps of any one of the above methods when executing the computer program.

[0035] The beneficial effects of the present invention are:

[0036] The present application analyzes the total pressure and flow at the outlet of the gas cylinder in a control signal cycle, as well as the total pressure at the inlet of the pulse valve. Since the control signal controls the opening and closing of the electromagnetic pulse valve, there will be a difference in the gas pressure of the pressure tank, the pulse valve and the gas cylinder, resulting in a period of ineffective working time. At the same time, the gas pressure in the pressure tank is gradually equal to the gas pressure of the pulse valve and the gas cylinder. The effective working time is between the two periods of ineffective working time. The invalid flow part and the effective flow part are marked on this basis. The flow efficiency ratio of the pulse valve is calculated based on the invalid flow part and the effective flow part. The flow efficiency ratio is the ratio of the effective flow area to the total flow area, which is an evaluation of the utilization rate of the high-pressure gas in the pressure tank by the pulse valve. Taking into account the problem of energy loss caused by the pressure difference between the total pressure at the inlet of the pulse valve and the total pressure at the outlet of the gas cylinder in the effective flow part, the pressure energy efficiency ratio of the pulse valve is further evaluated. First, the total pressure sequence of the outlet of the gas cylinder is analyzed. Decomposition is performed, and the total pressure of the cylinder outlet in the cylinder outlet total pressure sequence is determined according to the frequency spectrum distribution of the decomposition signal obtained by the decomposition, and the decomposition signal corresponding to the signal generated by the mechanical structure vibration is excluded to avoid the influence of the mechanical structure vibration caused by the airflow impacting the elastic parts in the pulse valve. The decomposition signal that excludes the influence of the mechanical structure vibration is synthesized into a vibration-free outlet total pressure sequence, and then the pressure energy efficiency ratio of the pulse valve is calculated according to the effective flow part in the cylinder outlet flow sequence, the pulse valve inlet total pressure sequence and the vibration-free outlet total pressure sequence; finally, the pulse valve energy efficiency ratio is calculated according to the flow efficiency ratio and pressure energy efficiency ratio of the pulse valve. The pulse valve energy efficiency ratio is a comprehensive evaluation index of the performance of the pulse valve. The pulse valve performance test result corresponding to the control signal period is obtained according to the pulse valve energy efficiency ratio, so as to solve the problem that the performance test of the electromagnetic pulse valve ignores the interaction between different performance parameters, which is easy to cause misjudgment of the overall performance of the electromagnetic pulse valve, and improve the accuracy of the pulse valve performance test. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0038] Figure 1 A schematic flow chart of a pulse valve performance testing method based on data analysis provided by one embodiment of the present invention;

[0039] Figure 2 A schematic diagram of a pulse valve working scenario provided by an embodiment of the present invention;

[0040] Figure 3A schematic diagram of a flow rate sequence of a cylinder outlet provided by an embodiment of the present invention;

[0041] Figure 4 A schematic diagram of a flow derivative sequence provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] See also Figure 1 , which shows a flow chart of a pulse valve performance testing method based on data analysis provided by an embodiment of the present invention, the method comprising the following steps:

[0044] Step S001, collecting the total pressure and flow rate at the outlet of the cylinder and the total pressure at the inlet of the pulse valve in a control signal cycle, and obtaining the total pressure sequence of the cylinder outlet, the flow sequence of the cylinder outlet and the total pressure sequence of the pulse valve inlet.

[0045] When testing the performance of the pulse valve, it is necessary to connect the pulse valve to the pressure tank, the gas cylinder and the control signal to simulate the working scene of the pulse valve. The schematic diagram of the pulse valve working scene is shown in the figure. Figure 2 shown.

[0046] A pressure sensor and a flow sensor are installed at the outlet of the gas cylinder. The pressure sensor is used to collect the total pressure at the outlet of the gas cylinder, and the flow sensor is used to collect the flow at the outlet of the gas cylinder. A pressure sensor is installed at the outlet of the pressure tank, and the pressure sensor is used to collect the total pressure at the inlet of the pulse valve.

[0047] The total pressure at the outlet of the sub-cylinder is recorded as the total pressure at the outlet of the sub-cylinder, the flow at the outlet of the sub-cylinder is recorded as the outlet flow of the sub-cylinder, and the total pressure at the inlet of the pulse valve is recorded as the total pressure at the inlet of the pulse valve.

[0048] The electromagnetic pulse valve is controlled by a control signal. To ensure the integrity of the collected total pressure at the outlet of the sub-cylinder, the outlet flow rate of the sub-cylinder and the total pressure at the inlet of the pulse valve, data collection starts from the beginning of a cycle of the electromagnetic pulse valve and stops at the end of the same electromagnetic pulse valve cycle.

[0049] In this embodiment, the period of the control signal is set to 360ms, and the collection time interval of the total pressure at the outlet of the cylinder, the flow rate at the outlet of the cylinder, and the total pressure at the inlet of the pulse valve is 0.1ms. As other implementations, the implementer can decide the period of the control signal and the time interval of data collection according to actual conditions. The pressure sensor of this embodiment uses the pressure transmitter MIK-P300, and the flow sensor uses the Rosemount 8800D flow sensor. As other implementations, the implementer can decide the models of the pressure sensor and the flow sensor according to actual conditions.

[0050] The outlet total pressure of the cylinder, the outlet flow rate of the cylinder and the inlet total pressure of the pulse valve are arranged in the time sequence of data collection to obtain the outlet total pressure sequence of the cylinder, the outlet flow rate sequence of the cylinder and the inlet total pressure sequence of the pulse valve.

[0051] At this point, the total pressure sequence at the outlet of the cylinder, the flow rate sequence at the outlet of the cylinder and the total pressure sequence at the inlet of the pulse valve are obtained.

[0052] Step S002, according to the flow extreme values ​​contained in the cylinder outlet flow sequence, determine the pulse valve opening extreme value moment and the pulse valve closing extreme value moment, mark the front marking point and the rear marking point of the pulse valve opening extreme value moment according to the derivative value of the pressure of the cylinder outlet flow before the pulse valve opening extreme value moment and the derivative value of the pressure of the cylinder outlet flow corresponding to the pulse valve opening extreme value moment, obtain the front marking point and the rear marking point of the pulse valve closing extreme value moment according to the pulse valve closing extreme value moment, mark the invalid flow part and the effective flow part according to all the front marking points and the rear marking points, and calculate the flow efficiency ratio of the pulse valve based on the invalid flow part and the effective flow part.

[0053] At the moment when the control signal controls the electromagnetic pulse valve to open, there will be a period of ineffective working time. The specific reason is: after the pulse valve receives the pulse signal to open, the pulse valve inlet will open, and the gas in the pressure tank will flow into the pulse valve and the sub-cylinder. At this time, the gas pressure in the pressure tank is greater than the gas pressure of the pulse valve and the gas pressure of the sub-cylinder, which will cause pressure waves in the pulse valve and the sub-cylinder. Under the action of the pressure wave, gas will flow out of the outlet of the sub-cylinder. However, the gas flow rate flowing out of the sub-cylinder at this time is unstable and the pressure is small, which cannot meet the use and working requirements of the gas pulse valve, that is, the gas flowing out of the pressure tank at this time does not work effectively. Therefore, it is necessary to record the gas flow data generated in this case as the invalid flow part. The flow data at the corresponding moment of the invalid flow part usually shows that the outlet flow and total pressure of the sub-cylinder are small and the values ​​are unstable.

[0054] Similarly, when the control signal controls the electromagnetic pulse valve to close, there will be a period of ineffective working time, and the gas flow data generated in this case needs to be recorded as an invalid flow part.

[0055] When the gas pressure in the pressure tank gradually becomes equal to the gas pressure of the pulse valve and the sub-cylinder, the gas flow rate and pressure output by the sub-cylinder will gradually stabilize until the control signal controls the electromagnetic pulse valve to close. During this period, the gas flow output by the pulse valve can meet the use and working requirements of the gas pulse valve. The gas flow data generated in this case is recorded as the effective flow part. The flow data at the corresponding moment of the effective flow part usually shows that the outlet flow and total pressure of the sub-cylinder are large and the values ​​are stable.

[0056] When the proportion of the gas flow of the invalid flow part to the total gas flow is larger, the pulse valve's utilization rate of the high-pressure gas in the pressure tank is lower, and the pulse valve efficiency ratio is lower.

[0057] In order to evaluate the flow efficiency ratio of the pulse valve, first of all, it is necessary to determine the invalid flow part and the effective flow part.

[0058] The schematic diagram of the flow sequence of the cylinder outlet is as follows: Figure 3 As shown. Figure 3 In the figure, the horizontal axis is time, the unit of which is ms, and the vertical axis is the pressure of the cylinder outlet flow, the unit of which is atm. At time 0, the pressure of the cylinder outlet flow obviously rises, and at time 180ms, the pressure of the cylinder outlet flow obviously drops.

[0059] The first-order derivative calculation method is used for the flow sequence of the cylinder outlet to calculate the derivative sequence of the flow sequence of the cylinder outlet, and the flow derivative sequence of the flow sequence of the cylinder outlet is obtained. In the flow derivative sequence, there are two obvious peaks, which correspond to the invalid flow part corresponding to the opening and closing of the pulse valve, and the time period between the two peaks corresponds to the effective flow part.

[0060] Among them, this embodiment uses a first-order derivative calculation method to calculate the derivative sequence of the cylinder outlet flow sequence. Using the first-order derivative calculation method to calculate the derivative is a well-known technology and will not be repeated. As other implementation methods, on the basis of achieving the purpose of calculating the derivative sequence of the cylinder outlet flow sequence, the implementer can use other methods of the prior art to obtain the derivative sequence of the cylinder outlet flow sequence, and this application does not impose any special restrictions.

[0061] The flow derivative sequence diagram is as follows Figure 4 As shown. Figure 4In the figure, the horizontal axis is time, and the unit of the horizontal axis is milliseconds. The vertical axis is the first-order derivative of the pressure of the cylinder outlet flow, and the vertical axis has no unit. In the flow derivative sequence diagram, there are two obvious peaks. The peak corresponding to the time close to 0ms corresponds to the process of the control signal controlling the pulse valve to open, and the peak corresponding to the time close to 180ms corresponds to the process of the control signal controlling the pulse valve to close. Both correspond to the invalid flow part, and the part between the two peaks corresponds to the effective flow part.

[0062] The flow derivative sequence is smoothed using a mean filter algorithm to obtain a smoothed flow derivative sequence of the flow derivative sequence, wherein the filter window length of the mean filter algorithm in this embodiment is set to 3. The smoothed flow derivative sequence is detected using a maximum point detection algorithm to obtain the maximum point in the smoothed flow derivative sequence. The acquisition time corresponding to the largest maximum point in the smoothed flow derivative sequence is recorded as the pulse valve opening extreme point of the smoothed flow derivative sequence, and the acquisition time corresponding to the smallest minimum point in the smoothed flow derivative sequence is recorded as the pulse valve closing extreme point of the smoothed flow derivative sequence.

[0063] Among them, this embodiment selects a mean filtering algorithm to smooth the flow derivative sequence, and uses a maximum point detection algorithm to obtain the maximum points in the smoothed flow derivative sequence. Using a mean filtering algorithm to smooth the flow derivative sequence and using a maximum point detection algorithm to obtain the maximum points are both well-known technologies and will not be repeated here. On the basis of the purpose of smoothing the flow derivative sequence and obtaining the maximum points in the smoothed flow derivative sequence, the implementer can use other methods of the prior art to smooth the flow derivative sequence and obtain the maximum points in the smoothed flow derivative sequence, and this application does not impose any special restrictions.

[0064] Multiply the derivative of the pressure of the cylinder outlet flow at the moment when the pulse valve opens to the extreme value by the first preset threshold value to obtain the threshold peak value at the moment when the pulse valve opens to the extreme value; record the latest moment of the derivative of the pressure of the cylinder outlet flow equal to the threshold peak value in the adjacent moments before the moment when the pulse valve opens to the extreme value as the front mark point of the pulse valve opening to the extreme value; record the earliest moment of the derivative of the pressure of the cylinder outlet flow equal to the threshold peak value in the adjacent moments after the moment when the pulse valve opens to the extreme value as the post mark point of the pulse valve opening to the extreme value.

[0065] In this embodiment, the value of the first preset threshold is 5%, and the implementer can determine the value of the first preset threshold according to actual conditions.

[0066] According to the same acquisition method as the front mark point and the rear mark point of the pulse valve opening extreme value moment, the front mark point and the rear mark point of the pulse valve closing extreme value moment are obtained according to the pulse valve closing extreme value moment, specifically:

[0067] Multiply the derivative of the pressure of the cylinder outlet flow at the extreme moment when the pulse valve closes by the first preset threshold value to obtain the threshold peak value at the extreme moment when the pulse valve closes. The latest moment of the derivative of the pressure of the cylinder outlet flow equal to the threshold peak value in the adjacent moments before the extreme moment when the pulse valve closes is recorded as the front mark point of the extreme moment when the pulse valve closes. The earliest moment of the derivative of the pressure of the cylinder outlet flow equal to the threshold peak value in the adjacent moments after the extreme moment when the pulse valve closes is recorded as the post mark point of the extreme moment when the pulse valve closes.

[0068] At this point, the front mark point and the rear mark point of the pulse valve opening extreme moment, as well as the front mark point and the rear mark point of the pulse valve closing extreme moment can be obtained, that is, 2 front mark points and 2 rear mark points, a total of 4 mark points.

[0069] The flow rate at the outlet of the gas cylinder corresponding to all the moments between the front mark point and the rear mark point of the pulse valve opening extreme moment is recorded as the invalid flow part. The flow rate at the outlet of the gas cylinder corresponding to all the moments between the front mark point and the rear mark point of the pulse valve closing extreme moment is recorded as the invalid flow part. The gas flow data corresponding to all the moments between the rear mark point of the pulse valve opening extreme moment and the front mark point of the pulse valve closing extreme moment is recorded as the effective flow part.

[0070] The flow efficiency ratio of the pulse valve is calculated based on the invalid flow part and the effective flow part.

[0071] With the acquisition time as the horizontal coordinate and the flow rate of the sub-cylinder outlet included in the sub-cylinder outlet flow rate sequence as the vertical coordinate, a sub-cylinder outlet flow rate sequence curve is established, and the curve integral value of all invalid flow parts in the sub-cylinder outlet flow rate sequence curve is recorded as the invalid flow area, and the curve integral value of all effective flow parts in the sub-cylinder outlet flow rate sequence curve is recorded as the effective flow area. The sum of the effective flow area and the invalid flow area is recorded as the total flow area, and the ratio of the effective flow area to the total flow area is recorded as the flow efficiency ratio of the pulse valve.

[0072] When the flow efficiency ratio of the pulse valve is larger and the proportion of the effective flow area to the total flow area is larger, the utilization rate of the pulse valve for the high-pressure gas in the pressure tank is higher.

[0073] At this point, the flow efficiency ratio of the pulse valve is obtained.

[0074] Step S003, decompose the total pressure sequence at the outlet of the cylinder to obtain a preset number of decomposition signals, calculate the center frequency of the decomposition signal according to the frequency spectrum of each decomposition signal, synthesize the decomposition signals according to the values ​​of the center frequencies of all decomposition signals, and obtain the total pressure sequence without vibration outlet, calculate the pressure energy efficiency ratio of the pulse valve according to the effective flow part in the outlet flow sequence of the cylinder, the total pressure sequence of the pulse valve inlet and the total pressure sequence of the de-vibration outlet.

[0075] In the effective flow part, there is a pressure difference between the total pressure at the pulse valve inlet and the total pressure at the outlet of the gas cylinder. The pressure difference will cause the high-pressure gas to collide in the internal structure of the pulse valve, resulting in energy loss. The greater the pressure difference between the total pressure at the pulse valve inlet and the total pressure at the outlet of the gas cylinder, the greater the energy loss of the pulse valve and the smaller the flow efficiency ratio of the pulse valve.

[0076] The impact of airflow on the elastic parts in the pulse valve will cause the mechanical structure to vibrate, causing the total pressure at the outlet of the cylinder to fluctuate. The process of mechanical structure vibration is the process of converting the kinetic energy of the high-pressure gas in the pressure tank into the internal energy of the pulse valve. The converted internal energy of the pulse valve is the efficiency loss of the pulse valve to the high-pressure gas in the pressure tank.

[0077] Since the frequency of fluctuations in the total pressure at the outlet of the sub-cylinder is relatively large, the influence of the fluctuations in the total pressure at the outlet of the sub-cylinder needs to be eliminated.

[0078] Decompose the total pressure sequence at the outlet of the cylinder to obtain multiple decomposition signals. This embodiment uses the EMD decomposition algorithm to decompose the total pressure sequence at the outlet of the cylinder, and the number of decomposition signals is set to 5. The process of using the EMD decomposition algorithm to decompose the total pressure sequence at the outlet of the cylinder into a preset number of decomposition signals is a known technology and will not be repeated. On the basis of the purpose of decomposing the total pressure sequence at the outlet of the cylinder, the implementer can use other existing methods to decompose the total pressure sequence at the outlet of the cylinder, and this application does not impose any special restrictions.

[0079] Each decomposed signal is processed using the fast Fourier transform algorithm to obtain the spectrum of the decomposed signal. The spectrum of the decomposed signal is a two-row matrix. In the spectrum of the decomposed signal, the first row of data represents the frequency, and the second row of data represents the intensity ratio of the signal corresponding to the frequency of the first row to all signals. In the spectrum of the decomposed signal, each data in the second row is used as the weight of the corresponding data in the first row, and the data in the first row of the spectrum of the decomposed signal is weighted and summed to obtain the center frequency of the decomposed signal.

[0080] The center frequency of the decomposed signal is used to evaluate the overall frequency distribution of the decomposed signal. The use of a fast Fourier transform algorithm to obtain the spectrum of the decomposed signal is a well-known technique and will not be described in detail.

[0081] According to the experience of those skilled in the art, the frequency threshold is set to 1000 Hz, and the decomposed signals corresponding to the center frequency less than the frequency threshold are synthesized to obtain the vibration-free outlet total pressure sequence. The vibration-free outlet total pressure sequence is the cylinder outlet total pressure sequence without the influence of the pulse valve vibration.

[0082] Among them, this embodiment uses the synthesis algorithm of the EMD decomposition algorithm to synthesize the decomposed signal corresponding to the center frequency less than the frequency threshold. It is a well-known technology to synthesize the signal using the synthesis algorithm of the EMD decomposition algorithm, which will not be repeated here. On the basis of the purpose of synthesizing the signal, the implementer can use other methods of the prior art to synthesize the signal, and this application does not make any special restrictions. As other implementation methods, the implementer can decide the value of the frequency threshold according to the actual situation.

[0083] Furthermore, it is considered that the decomposition signal corresponding to the center frequency less than the frequency threshold is a low-frequency signal, which corresponds to the total pressure of the cylinder outlet in the cylinder outlet total pressure sequence, and the decomposition signal corresponding to the center frequency greater than or equal to the frequency threshold is a high-frequency signal, which corresponds to the signal generated by the mechanical structure vibration of the elastic parts in the pulse valve.

[0084] The pressure energy efficiency ratio is calculated based on the effective flow portion in the cylinder outlet flow sequence, the pulse valve inlet total pressure sequence and the vibration-free outlet total pressure sequence.

[0085] The effective flow part in the flow sequence of the cylinder outlet is used as the weight, and the values ​​corresponding to each effective flow part in the total pressure sequence of the pulse valve inlet are weighted and summed to obtain the weighted total pressure at the pulse valve inlet. The effective flow part in the flow sequence of the cylinder outlet is used as the weight, and the values ​​corresponding to each effective flow part in the total pressure sequence of the vibration-free outlet are weighted and summed to obtain the weighted total pressure at the pulse valve outlet. The ratio of the weighted total pressure at the pulse valve outlet to the weighted total pressure at the pulse valve inlet is recorded as the pressure energy efficiency ratio of the pulse valve.

[0086] Among them, the value corresponding to the effective flow part is the value at the same data collection time.

[0087] The pressure energy efficiency ratio of the pulse valve indicates the pressure transmission efficiency in the effective flow part. The larger the pressure energy efficiency ratio of the pulse valve, the better the pulse valve's ability to fully output the pressure of the pressure tank.

[0088] At this point, the pressure energy efficiency ratio of the pulse valve is obtained.

[0089] Step S004, calculating the pulse valve energy efficiency ratio according to the flow efficiency ratio and pressure energy efficiency ratio of the pulse valve, and obtaining the pulse valve performance test result corresponding to the control period according to the pulse valve energy efficiency ratio.

[0090] The pulse valve energy efficiency ratio is calculated according to the flow efficiency ratio and pressure energy efficiency ratio of the pulse valve. The pulse valve energy efficiency ratio is the product of the flow efficiency ratio and the pressure energy efficiency ratio of the pulse valve.

[0091] The flow efficiency ratio is the ratio of effective flow to total flow, the pressure efficiency ratio is the ratio of the total pressure of the working airflow to the total pressure of the gas consumed by the pressure tank, and the pulse valve efficiency ratio indicates the efficiency of the pulse valve in utilizing the high-pressure gas in the pressure tank during the entire pulse valve cycle. The larger the pulse valve efficiency ratio, the higher the efficiency of the pulse valve in utilizing the high-pressure gas in the pressure tank, and the pulse valve can complete its work with less high-pressure gas consumption.

[0092] When the pulse valve energy efficiency ratio is greater than or equal to the energy efficiency threshold, the pulse valve is considered to have good performance; when the pulse valve energy efficiency ratio is less than the energy efficiency threshold, the pulse valve is considered to have poor performance. In this embodiment, the energy efficiency threshold is 75%. As other implementation methods, the implementer can decide the value of the energy efficiency threshold according to the actual situation.

[0093] The energy efficiency ratio of the pulse valve can intuitively show the pulse valve's ability to utilize the high-pressure gas in the pressure tank. Compared with the existing technology that only uses a single indicator to evaluate the performance of the pulse valve, the energy efficiency ratio can more comprehensively reflect the actual working performance of the pulse valve, provide a reference for the selection, optimal use and maintenance of the pulse valve, and solve the problem that the performance test of the electromagnetic pulse valve ignores the interaction between different performance parameters, which can easily lead to misjudgment of the overall performance of the electromagnetic pulse valve.

[0094] At this point, the pulse valve performance test results corresponding to the control cycle are obtained.

[0095] Based on the same inventive concept as the above method, an embodiment of the present invention also provides a pulse valve performance testing system based on data analysis, including a memory, a processor, and a computer program stored in the memory and running on the processor, and when the processor executes the computer program, the steps of any one of the above-mentioned pulse valve performance testing methods based on data analysis are implemented.

[0096] 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 principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pulse valve performance test method based on data analysis, characterized in that: The method comprises the following steps: Collect the total pressure and flow rate at the outlet of the gas cylinder and the total pressure at the inlet of the pulse valve in a control signal cycle, and obtain the total pressure sequence at the outlet of the gas cylinder, the flow rate sequence at the outlet of the gas cylinder and the total pressure sequence at the inlet of the pulse valve; According to the flow extreme values ​​contained in the cylinder outlet flow sequence, determine the pulse valve opening extreme value moment and the pulse valve closing extreme value moment, mark the front mark point and the rear mark point of the pulse valve opening extreme value moment according to the derivative value of the pressure of the cylinder outlet flow before the pulse valve opening extreme value moment and the derivative value of the pressure of the cylinder outlet flow corresponding to the pulse valve opening extreme value moment, obtain the front mark point and the rear mark point of the pulse valve closing extreme value moment according to the pulse valve closing extreme value moment, mark the invalid flow part and the effective flow part according to all the front mark points and the rear mark points, and calculate the flow efficiency ratio of the pulse valve according to the invalid flow part and the effective flow part; Decompose the outlet total pressure sequence of the cylinder to obtain a preset number of decomposition signals, calculate the center frequency of the decomposition signal according to the frequency spectrum of each decomposition signal, synthesize the decomposition signals according to the values ​​of the center frequencies of all decomposition signals, obtain the vibration-free outlet total pressure sequence, calculate the pressure energy efficiency ratio of the pulse valve according to the effective flow portion in the outlet flow sequence of the cylinder, the pulse valve inlet total pressure sequence and the vibration-free outlet total pressure sequence; The pulse valve energy efficiency ratio is calculated according to the flow efficiency ratio and pressure energy efficiency ratio of the pulse valve, and the pulse valve performance test result corresponding to the control period is obtained according to the pulse valve energy efficiency ratio.

2. The pulse valve performance testing method based on data analysis according to claim 1 is characterized in that: The method for obtaining the pulse valve opening extreme value time and the pulse valve closing extreme value time is: Smoothing the derivative sequence of the flow rate sequence at the outlet of the cylinder, obtaining a smoothed flow rate derivative sequence of the flow rate derivative sequence, and obtaining a maximum value point in the smoothed flow rate derivative sequence; The collection time corresponding to the largest maximum point in the smooth flow derivative sequence is recorded as the pulse valve opening extreme time of the smooth flow derivative sequence, and the collection time corresponding to the smallest minimum point in the smooth flow derivative sequence is recorded as the pulse valve closing extreme time of the smooth flow derivative sequence.

3. The pulse valve performance testing method based on data analysis according to claim 1 is characterized in that: The method of marking the front mark point and the rear mark point of the pulse valve opening extreme moment according to the derivative value of the pressure of the cylinder outlet flow rate before the pulse valve opening extreme moment and the derivative value of the pressure of the cylinder outlet flow rate corresponding to the pulse valve opening extreme moment includes: The derivative of the pressure of the outlet flow of the gas cylinder corresponding to the pulse valve opening extreme value moment is multiplied by the first preset threshold value to obtain the threshold peak value at the pulse valve opening extreme value moment; In the adjacent moments before the pulse valve opening extreme moment, the latest moment of the derivative of the pressure of the cylinder outlet flow equal to the threshold peak value is recorded as the front mark point of the pulse valve opening extreme moment; in the adjacent moments after the pulse valve opening extreme moment, the earliest moment of the derivative of the pressure of the cylinder outlet flow equal to the threshold peak value is recorded as the back mark point of the pulse valve opening extreme moment.

4. The pulse valve performance testing method based on data analysis according to claim 1 is characterized in that: The method for obtaining the invalid flow part and the valid flow part is: The flow rate at the outlet of the cylinder corresponding to all the moments between the front mark point and the rear mark point of the pulse valve opening extreme moment is recorded as the invalid flow rate part; The flow at the outlet of the cylinder corresponding to all the moments between the front mark point and the rear mark point of the pulse valve closing extreme value moment is recorded as the invalid flow part; The gas flow data corresponding to all the moments between the rear mark point of the pulse valve opening extreme moment and the front mark point of the pulse valve closing extreme moment are recorded as the effective flow part.

5. The pulse valve performance testing method based on data analysis according to claim 1 is characterized in that: The method for obtaining the flow efficiency ratio of the pulse valve is: With the acquisition time as the horizontal coordinate and the flow rate of the sub-cylinder outlet included in the sub-cylinder outlet flow rate sequence as the vertical coordinate, a sub-cylinder outlet flow rate sequence curve graph is established, and the curve integral value of all invalid flow parts in the sub-cylinder outlet flow rate sequence curve graph is recorded as the invalid flow area, and the curve integral value of all valid flow parts in the sub-cylinder outlet flow rate sequence curve graph is recorded as the valid flow area; The sum of the effective flow area and the invalid flow area is recorded as the total flow area, and the ratio of the effective flow area to the total flow area is recorded as the flow efficiency ratio of the pulse valve.

6. The pulse valve performance testing method based on data analysis according to claim 1 is characterized in that: The method for obtaining the center frequency of the decomposed signal is: Each data in the second row of the spectrum of the decomposed signal is used as the weight of the corresponding data in the first row of the spectrum of the decomposed signal, and all data in the first row of the spectrum of the decomposed signal are weighted summed to obtain the center frequency of the decomposed signal.

7. The pulse valve performance testing method based on data analysis according to claim 1 is characterized in that: The decomposed signals are synthesized according to the values ​​of the center frequencies of all decomposed signals to obtain the vibration-free outlet total pressure sequence, including the specific method of: The decomposed signals corresponding to the central frequencies less than the frequency threshold are synthesized into one signal to obtain the de-vibration outlet total pressure sequence.

8. The pulse valve performance testing method based on data analysis according to claim 1 is characterized in that: The calculation method of the pressure energy efficiency ratio of the pulse valve is: The effective flow part in the flow sequence of the cylinder outlet is used as the weight, and the total pressure data of the pulse valve inlet at the same collection time are weighted and summed to obtain the weighted total pressure at the pulse valve inlet; Taking the effective flow part in the flow sequence of the cylinder outlet as the weight, weighted summing is performed on the values ​​corresponding to each effective flow part in the total pressure sequence of the vibration-free outlet to obtain the weighted total pressure of the pulse valve outlet; The ratio of the weighted total pressure at the pulse valve outlet to the weighted total pressure at the pulse valve inlet is recorded as the pressure energy efficiency ratio of the pulse valve.

9. The pulse valve performance testing method based on data analysis according to claim 1 is characterized in that: The specific method of calculating the pulse valve energy efficiency ratio according to the flow efficiency ratio and pressure energy efficiency ratio of the pulse valve and obtaining the pulse valve performance test result corresponding to the control period according to the pulse valve energy efficiency ratio is as follows: The product of the flow efficiency ratio and the pressure efficiency ratio of the pulse valve is recorded as the pulse valve energy efficiency ratio; When the pulse valve energy efficiency ratio is greater than or equal to the energy efficiency threshold, the pulse valve is judged to have good performance; when the pulse valve energy efficiency ratio is less than the energy efficiency threshold, the pulse valve is judged to have poor performance.

10. A pulse valve performance test system based on data analysis, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 9 are implemented.

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