CN114199318A - Gas volume measuring and calculating method, device and storage medium - Google Patents
Gas volume measuring and calculating method, device and storage medium Download PDFInfo
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- CN114199318A CN114199318A CN202111332373.5A CN202111332373A CN114199318A CN 114199318 A CN114199318 A CN 114199318A CN 202111332373 A CN202111332373 A CN 202111332373A CN 114199318 A CN114199318 A CN 114199318A
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- volume value
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/20—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow
- G01F1/28—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow by drag-force, e.g. vane type or impact flowmeter
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Abstract
The application discloses a method and a device for measuring and calculating gas volume and a storage medium. The gas volume estimation method is used for a turbine flowmeter and comprises the following steps: acquiring the rotation frequency of the turbine when the gas passes through the turbine type flowmeter; obtaining a corresponding correction coefficient according to the rotation frequency; obtaining a correction volume value according to the rotation frequency and the correction coefficient; and obtaining a gas volume value according to an ideal volume value and the correction volume value, wherein the ideal volume value is obtained when the turbine rotates at a constant speed. The gas volume measuring and calculating method at least has the following beneficial effects: a speed punishment mechanism is introduced on the basis of a conventional turbine flow calculation model by setting a correction coefficient, so that the condition of dynamic change of the turbine rotation speed in an actual test can be better simulated, and the measurement and calculation error caused by the dynamic change of the turbine rotation speed is reduced.
Description
Technical Field
The present application relates to the field of health monitoring, and in particular, to a method and an apparatus for measuring and calculating a gas volume, and a storage medium.
Background
In the related art, a flow calculation model is used to calculate the gas flow. The conventional turbine type flow calculation model is a steady-state model, which is established on the premise that a turbine rotates at a constant speed. However, in actual tests, the rotation speed of the turbine is dynamically changed, so that a large error is caused by adopting a conventional turbine flow calculation model.
Disclosure of Invention
The present application is directed to solving at least one of the problems in the prior art. Therefore, the application provides a gas volume measuring and calculating method, which introduces a speed punishment mechanism on the basis of a conventional turbine flow calculation model by setting a correction coefficient and reduces the measuring and calculating error caused by the dynamic change of the turbine rotating speed.
The application also provides a gas volume measuring and calculating device with the gas volume measuring and calculating method and a computer readable storage medium.
The gas volume estimation method according to the embodiment of the first aspect of the present application is used for a turbine flowmeter, and includes: acquiring the rotation frequency of the turbine when the gas passes through the turbine type flowmeter; obtaining a corresponding correction coefficient according to the rotation frequency; obtaining a correction volume value according to the rotation frequency and the correction coefficient; and obtaining a gas volume value according to an ideal volume value and the correction volume value, wherein the ideal volume value is obtained when the turbine rotates at a constant speed.
The gas volume measuring and calculating method according to the embodiment of the application has at least the following beneficial effects: a speed punishment mechanism is introduced on the basis of a conventional turbine flow calculation model by setting a correction coefficient, so that the condition of dynamic change of the turbine rotation speed in an actual test can be better simulated, and the measurement and calculation error caused by the dynamic change of the turbine rotation speed is reduced.
According to some embodiments of the application, further comprising: acquiring the number of rotation turns of the turbine after the gas passes through the turbine type flowmeter; and calculating the product value of a preset conversion coefficient and the number of rotation turns to obtain the ideal volume value.
According to some embodiments of the present application, each revolution of the turbine corresponds to one of the rotational frequencies, and each of the rotational frequencies corresponds to one of the correction coefficients.
According to some embodiments of the application, the step of deriving a correction volume value from the rotational frequency and the correction factor comprises: calculating the product value of each rotation frequency and the corresponding correction coefficient to obtain a unit correction value; and summing all the unit correction values to obtain the correction volume value.
According to some embodiments of the application, the step of deriving a gas volume value from a desired volume value and the corrected volume value comprises: and calculating the sum of the ideal volume value and the corrected volume value to obtain the gas volume value.
According to some embodiments of the application, the step of deriving a gas volume value from a desired volume value and the corrected volume value further comprises: and obtaining the gas volume value according to the ideal volume value, the correction volume value and a preset bias constant.
According to some embodiments of the application, the gas volume value is a sum of the ideal volume value, the correction volume value and the bias constant.
According to some embodiments of the present application, the step of obtaining the number of revolutions of the turbine after the gas passes through the turbine-type flow meter comprises: acquiring a raw signal measured by the turbine flowmeter; sampling the original signal to obtain a sampling sequence; screening the sampling sequence to obtain a target sequence; and obtaining the rotation number according to the target sequence.
A gas volume estimation device according to an embodiment of the second aspect of the present application, includes: the measuring and calculating module is used for acquiring the gas passing turbine type flow meter and the rotation frequency of the turbine; the processing module is connected with the measuring and calculating module and used for obtaining a corresponding correction coefficient according to the rotation frequency; the calculation module is respectively connected with the measuring and calculating module and the processing module and is used for obtaining a correction volume value according to the rotation frequency and the correction coefficient; the calculation module is further configured to obtain a gas volume value according to an ideal volume value and the corrected volume value, where the ideal volume value is obtained when the turbine is in a uniform rotation state.
According to a third aspect embodiment of the present application, there is provided a computer-readable storage medium having stored thereon computer-executable instructions for causing a computer to perform the gas volume estimation method as described above in the first aspect embodiment.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The present application is further described with reference to the following figures and examples, in which:
FIG. 1 is a flow chart of one embodiment of a method for gas volume estimation of the present application;
FIG. 2 is a flow chart of another embodiment of the gas volume estimation method of the present application;
FIG. 3 is a flow chart of yet another embodiment of the gas volume estimation method of the present application;
FIG. 4 is a flowchart of one embodiment of step S500 in FIG. 2;
FIG. 5 is a block diagram of an embodiment of the gas volume measuring device of the present application.
Reference numerals: the system comprises a measuring module 100, a processing module 200 and a calculating module 300.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
In the description of the present application, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and the above, below, exceeding, etc. are understood as excluding the present number, and the above, below, within, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present application, unless otherwise expressly limited, terms such as set, mounted, connected and the like should be construed broadly, and those skilled in the art can reasonably determine the specific meaning of the terms in the present application by combining the detailed contents of the technical solutions.
The gas volume measuring and calculating method is used for the turbine type flowmeter, and the turbine type flowmeter is a flowmeter which adopts a turbine to measure. The speed of flow is converted into the speed of rotation of turbine, which is converted into electric signal proportional to flow. The flowmeter is used for detecting instantaneous flow and total integrated flow, and the output signal of the flowmeter is frequency and easy to digitize. A conventional turbine flowmeter is provided with an induction coil and a permanent magnet, which are fixed together to a case. When the ferromagnetic turbine blades pass the magnets, the reluctance of the magnetic circuit changes, thereby generating an induced signal. The signal is amplified and shaped by an amplifier and sent to a counter or a frequency meter to display the total integrated flow. While the pulse frequency is frequency-to-voltage converted to indicate instantaneous flow. The speed of rotation of the impeller is proportional to the flow rate and the number of revolutions of the impeller is proportional to the total flow through. The output of the turbine flowmeter is a frequency modulation signal, so that the anti-interference performance of a detection circuit is improved, and a flow detection system is simplified.
The turbine flowmeter of the embodiment of the application is provided with the laser emission pipe and the receiving pipe, and the laser emission pipe and the receiving pipe are respectively arranged on two sides of the turbine blade. In the process of turbine rotation, the turbine blades can obstruct the receiving tube at intervals to receive the optical signal of the transmitting tube, the signal acquisition circuit generates an electric pulse signal according to the optical signal, and the signal is the acquired original signal.
In some embodiments, referring to fig. 1, a gas volume estimation method includes:
s100, acquiring the rotation frequency of a turbine when gas passes through the turbine type flow meter;
s200, obtaining a corresponding correction coefficient according to the rotation frequency;
s300, obtaining a correction volume value according to the rotation frequency and the correction coefficient;
and S400, obtaining a gas volume value according to the ideal volume value and the corrected volume value, wherein the ideal volume value is obtained when the turbine rotates at a constant speed.
In the illustrative embodiment, when the gas volume is measured and calculated by using the turbine type flowmeter, the gas flow is calculated by using a turbine flow calculation model. The conventional turbine flow calculation model is a steady-state model, which is established on the premise that the turbine is in a state of uniform motion. However, in the actual estimation process, the rotation speed of the turbine dynamically changes, so that a large calculation error exists by using the model.
In step S100, the gas passes through the turbine flowmeter to drive the turbine blades to rotate, and the rotation frequency is actually the frequency of the induction signal generated by the rotation of the blades. Because the speed at which the turbine rotates varies dynamically, so does the rotational frequency. When the measured fluid flows through the sensor of the turbine flowmeter, the impeller is forced to rotate under the action of the fluid, and the rotating speed of the impeller is in direct proportion to the average flow speed of the pipeline. In the process of turbine rotation, the turbine blades can obstruct the receiving tube at intervals to receive the optical signal of the transmitting tube, the signal acquisition circuit generates an electric pulse signal according to the optical signal, the signal is an acquired original signal, and the frequency of the electric pulse signal is in direct proportion to the flow of the measured fluid.
For step S200, the correction factor is a set of data obtained during calibration of the turbine meter for different gas flow rates and different flow rates before actual measurement. In the calibration process, the influence of environmental factors on the flowmeter is avoided, such as the influence of external air flow or foreign matters and impurities entering the flowmeter on the calibration result.
For step S300, a correction volume value is obtained according to the rotation frequency and the correction coefficient, and the correction volume value can correct the calculation result of the original calculation model, so as to reduce the error.
For step S400, the ideal volume value is a calculation result obtained on the basis of a conventional turbine flow calculation model, that is, a volume value obtained under the assumption that the turbine rotates at a constant speed all the time.
The gas volume measuring and calculating method according to the embodiment of the application has at least the following beneficial effects: a speed punishment mechanism is introduced on the basis of a conventional turbine flow calculation model by setting a correction coefficient, so that the condition of dynamic change of the turbine rotation speed in an actual test can be better simulated, and the measurement and calculation error caused by the dynamic change of the turbine rotation speed is reduced.
In some embodiments, referring to fig. 2, the gas volume estimation method further comprises:
s500, acquiring the number of rotation turns of a turbine after the gas passes through the turbine type flowmeter;
s600, calculating a product value of a preset conversion coefficient and the number of rotation turns to obtain an ideal volume value.
For step S500, the signal collected by the turbine sensor of the turbine flowmeter is a square-wave-like time period signal, so the number of revolutions of the turbine is proportional to the number of peaks or troughs of the collected signal.
For step S600, the number of revolutions is the main factor of influence of the ideal volume value, assuming that the turbine rotational speed is constant all the time.
In one embodiment, the conventional turbine flow calculation model assumes that the flow is in steady state, and is a linear model, therefore:
wherein Q isVRepresents the volume flow, ω represents the turbine rotational angular velocity, and φ represents the flow conversion coefficient of the turbine.
The calculation formula of the flow conversion coefficient is as follows:
wherein Z is the number of turbine blades; θ is the turbine blade angle; r is the blade radius; ρ represents the fluid density; a is the fluid cross-sectional area; t isrIs the rotational resistance torque.
Equation (2) shows that the conversion coefficient varies with the fluid density, and in practical applications, the coefficient is used as a constant and is calibrated by experiments.
By integrating equation (1), the desired volume value flowing through the turbine can be obtained:
where N represents the number of turbine revolutions and V1 represents the desired volume value. The relation between the conversion coefficient K and the flow conversion coefficient is
The formula (4) can be substituted for the formula (3):
V1＝K*N (5)
in some embodiments, each revolution of the turbine corresponds to a rotational frequency, and each rotational frequency corresponds to a correction factor. It will be appreciated that the speed at which the turbine rotates may vary dynamically, i.e. the rotational speed may vary from revolution to revolution, and the frequency of the induced signal, i.e. the rotational frequency, may also vary. In calibrating the flow meter, the obtained correction factor is actually a set of frequency correction factors calculated for each frequency point of the rotation frequency, i.e., a correction value corresponding to one correction factor for each rotation frequency. In other embodiments, a common correction value may be obtained by averaging the rotation frequencies of a plurality of revolutions to reduce the measurement time, but this reduces the accuracy of the measurement result.
Some embodiments, referring to fig. 3, the step of deriving a correction volume value from the rotation frequency and the correction factor comprises:
s310, calculating the product value of each rotating frequency and the corresponding correction coefficient to obtain a unit correction value;
and S320, summing all the unit correction values to obtain a corrected volume value.
The calculation formula of the corrected volume value is as follows:
where V2 represents the correction volume value, N represents the number of turbine revolutions, fiIndicating the rotational frequency, alpha, of the i-th turn of the turbineiRepresenting the corresponding frequency point fiThe correction coefficient of (1).
Some embodiments, referring to fig. 3, the step of deriving the gas volume value from the desired volume value and the corrected volume value comprises:
and S410, calculating the sum of the ideal volume value and the corrected volume value to obtain a gas volume value.
The calculation formula of the gas volume value is as follows:
V＝V1+V2 (7)
wherein V represents a gas volume value.
The formula (7) can be substituted with the formulae (5) and (6):
in some embodiments, the step of obtaining the gas volume value from the ideal volume value and the corrected volume value further comprises: and obtaining a gas volume value according to the ideal volume value, the correction volume value and a preset bias constant. The turbine rotation not only has inertia, but also overcomes the influence of factors such as frictional resistance, air flow resistance and the like, so that in the process of calibrating the flowmeter, an offset constant is obtained according to a calibration result and is used for eliminating errors caused by the turbine rotation inertia, the frictional resistance and the air resistance, and the measurement and calculation errors of the gas volume are further reduced.
In some embodiments, the gas volume value is a sum of an ideal volume value, a corrected volume value, and a bias constant. In this embodiment, the calculation formula of the gas volume value is:
wherein V represents a gas volume value, K represents a conversion coefficient, N represents the number of turbine revolutions, fiIndicating the rotational frequency, alpha, of the i-th turn of the turbineiRepresenting the corresponding frequency point fiAnd η represents a bias constant.
In some embodiments, referring to fig. 4, the step of obtaining the number of revolutions of the turbine after the gas passes through the turbine-type flow meter comprises:
s510, acquiring an original signal measured by the turbine flowmeter;
s520, sampling the original signal to obtain a sampling sequence;
s530, screening the sampling sequence to obtain a target sequence;
and S540, obtaining the rotation number according to the target sequence.
For step S510, when the measured fluid flows through the sensor of the turbine flowmeter, the impeller is forced to rotate under the action of the fluid, and the rotation speed of the impeller is proportional to the average flow speed of the pipeline. In the process of turbine rotation, the turbine blades can obstruct the receiving tube at intervals to receive the optical signal of the transmitting tube, the signal acquisition circuit generates an electric pulse signal according to the optical signal, and the signal is an acquired original signal and is a time period signal.
For step S520, sampling is also performed, which refers to a process of converting a continuous quantity in a time domain or a space domain into a discrete quantity. And also refers to the process of converting analog audio to digital audio. Sampling is to convert analog signals continuous in time and amplitude into discrete analog signals which are discrete in time (with fixed intervals in time) but continuous in amplitude under the action of sampling pulses. The sampling is also referred to as a discretization process of the waveform. In this embodiment, the sampling sequence is a discrete signal obtained by sampling an original signal.
For step S530, due to inertia and the characteristics of the turbine, the turbine continues to rotate for a period of time after the gas completely passes through the flow meter, so that the finally calculated number of rotations is greater than the actual number of rotations. Therefore, the number of turns below a certain flow rate is removed by screening and filtering a sampling series signal below a certain frequency, so that the number of abnormal turns caused by inertia and the characteristics of the turbine is removed, and more accurate number of turns of rotation is obtained.
For step S540, the number of rotations is determined according to the number of peaks or valleys of the target sequence signal. If the turbine is a two-wire turbine, every two peaks or troughs represents one revolution of the turbine. If the turbine is a single-line turbine, the number of revolutions is equal to the number of peaks or troughs.
Some embodiments, referring to fig. 5, a gas volume estimation device includes: the system comprises a measuring and calculating module 100, a processing module 200 and a calculating module 300, wherein the measuring and calculating module 100 is used for acquiring gas flow through a turbine type flowmeter and the rotation frequency of the turbine; the processing module 200 is connected with the measuring and calculating module 100, and the processing module 200 is used for obtaining a corresponding correction coefficient according to the rotation frequency; the calculation module 300 is respectively connected with the measurement and calculation module 100 and the processing module 200, and the calculation module 300 is used for obtaining a correction volume value according to the rotation frequency and the correction coefficient; the calculation module 300 is further configured to obtain a gas volume value according to the ideal volume value and the corrected volume value, where the ideal volume value is obtained when the turbine is in a uniform rotation state. A speed punishment mechanism is introduced on the basis of a conventional turbine flow calculation model by setting a correction coefficient, so that the condition of dynamic change of the turbine rotation speed in an actual test can be better simulated, and the measurement and calculation error caused by the dynamic change of the turbine rotation speed is reduced.
In some embodiments, the present application further includes a computer-readable storage medium having stored thereon computer-executable instructions for causing a computer to perform the gas volume estimation method as in the above embodiments.
In the description of the present application, reference to the description of the terms "one embodiment," "some embodiments," and "exemplary embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present application. Furthermore, the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
Claims (10)
1. A gas volume estimation method for a turbine flowmeter, comprising:
acquiring the rotation frequency of the turbine when the gas passes through the turbine type flowmeter;
obtaining a corresponding correction coefficient according to the rotation frequency;
obtaining a correction volume value according to the rotation frequency and the correction coefficient;
and obtaining a gas volume value according to an ideal volume value and the correction volume value, wherein the ideal volume value is obtained when the turbine rotates at a constant speed.
2. The gas volume estimation method according to claim 1, further comprising:
acquiring the number of rotation turns of the turbine after the gas passes through the turbine type flowmeter;
and calculating the product value of a preset conversion coefficient and the number of rotation turns to obtain the ideal volume value.
3. The gas volume estimation method according to claim 2, wherein each revolution of the turbine corresponds to one of the rotation frequencies, and each rotation frequency corresponds to one of the correction factors.
4. The gas volume estimation method according to claim 3, wherein the step of obtaining a correction volume value based on the rotation frequency and the correction factor comprises:
calculating the product value of each rotation frequency and the corresponding correction coefficient to obtain a unit correction value;
and summing all the unit correction values to obtain the correction volume value.
5. The gas volume estimation method according to claim 4, wherein the step of obtaining a gas volume value from a desired volume value and the corrected volume value comprises:
and calculating the sum of the ideal volume value and the corrected volume value to obtain the gas volume value.
6. The gas volume estimation method according to claim 1, wherein the step of obtaining a gas volume value from a desired volume value and the corrected volume value further comprises:
and obtaining the gas volume value according to the ideal volume value, the correction volume value and a preset bias constant.
7. The gas volume estimation method according to claim 6, wherein the gas volume value is a sum of the ideal volume value, the corrected volume value and the bias constant.
8. The gas volume estimation method according to claim 2, wherein the step of obtaining the number of rotations of the turbine after the gas passes through the turbine type flowmeter comprises:
acquiring a raw signal measured by the turbine flowmeter;
sampling the original signal to obtain a sampling sequence;
screening the sampling sequence to obtain a target sequence;
and obtaining the rotation number according to the target sequence.
9. Gas volume measuring device, its characterized in that includes:
the measuring and calculating module is used for acquiring the gas passing turbine type flow meter and the rotation frequency of the turbine;
the processing module is connected with the measuring and calculating module and used for obtaining a corresponding correction coefficient according to the rotation frequency;
the calculation module is respectively connected with the measuring and calculating module and the processing module and is used for obtaining a correction volume value according to the rotation frequency and the correction coefficient;
the calculation module is further configured to obtain a gas volume value according to an ideal volume value and the corrected volume value, where the ideal volume value is obtained when the turbine is in a uniform rotation state.
10. Computer-readable storage medium, characterized in that it stores computer-executable instructions for causing a computer to perform the gas volume estimation method according to any one of claims 1 to 8.
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| CN202111332373.5A CN114199318A (en) | 2021-11-11 | 2021-11-11 | Gas volume measuring and calculating method, device and storage medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117147027A (en) * | 2023-11-01 | 2023-12-01 | 哈尔滨工业大学 | Efficiency measurement method and system for micro turbine external sensor of breathing machine |
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2021
- 2021-11-11 CN CN202111332373.5A patent/CN114199318A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117147027A (en) * | 2023-11-01 | 2023-12-01 | 哈尔滨工业大学 | Efficiency measurement method and system for micro turbine external sensor of breathing machine |
| CN117147027B (en) * | 2023-11-01 | 2024-03-19 | 哈尔滨工业大学 | Efficiency measurement method and system for micro turbine external sensor of breathing machine |
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