CN117848465A - Temperature error correction method and system of ultrasonic water meter - Google Patents
Temperature error correction method and system of ultrasonic water meter Download PDFInfo
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Abstract
The invention belongs to the technical field of ultrasonic metering instrument verification, and particularly relates to a temperature error correction method and system. The system mainly comprises a data acquisition module; a compensation coefficient calculation module; the system comprises a model building module and a correction module. The method is characterized in that a Reynolds number Re is introduced to obtain a compensation parameter k for a certain specific temperature, a function model f (Re) =k of the Reynolds number Re and the compensation parameter k can be obtained, and then under the condition that a standard verification table is not available, the compensation parameter k is obtained rapidly in a self-lookup table self-comparison mode, the self-uncorrected flow L1 is corrected in real time, adverse effects caused by metering errors caused by the temperature are solved, and the metering accuracy of the ultrasonic water meter is improved.
Description
Technical Field
The invention belongs to the technical field of ultrasonic metering instrument verification, and particularly relates to a temperature error correction method and system.
Background
An ultrasonic water meter is a water meter for measuring water flow by utilizing an ultrasonic technology. It calculates the water flow by sending ultrasonic pulses and measuring the time it takes to travel in the water flow. Compared with the traditional mechanical water meter, the ultrasonic water meter has higher precision and stability. An ultrasonic flowmeter is arranged on the ultrasonic water meter, ultrasonic signals are transmitted and received through a transducer arranged on the ultrasonic flowmeter, and the flow velocity and flow information of the water body are calculated by combining the flight time of the ultrasonic signals between the water bodies and the section data of the detection pipeline.
In the prior art, since the measuring component in the ultrasonic water meter is easily affected by various external factors to generate errors, the error correction needs to be performed on the measuring result. For example, chinese patent publication No. CN 116659628A discloses an error evaluation and correction method for an ultrasonic flowmeter, in which a flow rate correction coefficient under a non-standard test condition is given relative to a standard test condition, and the error correction model is provided to enable the measurement error of the ultrasonic flowmeter to be within ±0.5% and the accuracy is high.
The method for evaluating and correcting the errors of the ultrasonic flowmeter is mainly aimed at the interference on the fluid flow and the error correction of various flow patterns when flow chokes such as a bent pipe, a valve, a pump and the like exist in a pipeline. In reality, based on cost consideration, many water pipelines and connecting parts are made of plastic or rubber materials, and the water pipelines and the connecting parts are deformed under the influence of temperature, so that standard flow fields are influenced, metering data of the flowmeter under different temperatures and different flow rates are influenced by different degrees, and metering accuracy is influenced. The scheme does not comprehensively consider the error influence of temperature on the metering component, and the correction mode has limitation.
Disclosure of Invention
The invention aims to provide a temperature error correction method and a system for an ultrasonic water meter, which can comprehensively evaluate adverse effects of temperature change on metering errors of a flowmeter in the water meter, eliminate errors by combining a scientific compensation mode and greatly improve the metering accuracy and reliability of the ultrasonic water meter.
In order to achieve the above purpose, the present invention adopts the following scheme:
the temperature error correction method of the ultrasonic water meter is characterized by comprising the following steps of:
s01, carrying out water flow test on a flowmeter in an ultrasonic water meter, and measuring a water body by the flowmeter in the ultrasonic water meter to obtain uncorrected flow L1; the standard verification platform measures the water body to obtain standard flow L2, and the corresponding test volume V1 and standard volume V2 are calculated by combining the test time t, wherein the formulas are shown in formulas (1-1) and (1-2):
V 1 ＝t×L 1 (1-1)
V 2 ＝t×L 2 (1-2)
the uncorrected flow L1 is an actual flow value, the standard flow L2 is an accurate reference flow value, and t is test time;
s02, calculating an average error ei according to the test volume V1 and the standard volume V2, wherein a formula is shown in a formula (1-3); calculating a compensation coefficient k according to the average error ei, wherein the formula is shown in the formula (1-4);
s03, establishing a function model f (Re) =k of the compensation coefficient k and the Reynolds number Re, wherein the formulas are shown in formulas (1-5), (1-6) and (1-7);
wherein Re represents the Reynolds number at a specific temperature, and ρ is the water density; v is the test flow rate; s is the sectional area of the pipeline; mu is the dynamic viscosity coefficient of the water body at a specific temperature; d is the diameter of the pipeline;
s04, when a plurality of groups of uncorrected flow L1 data under a certain temperature and a certain pipeline diameter d are measured, the data are brought into the function model f (Re) =k to obtain a corresponding Reynolds number Re; determining a compensation coefficient k according to the Reynolds number Re; and calculating to obtain a corrected flow L3, wherein the formula is shown in the formula (1-8);
L 3 ＝k×L 1 (1-8)
therefore, when the test is carried out, the standard verification platform is connected into the pipeline of the ultrasonic water meter to be tested, namely, the standard verification platform and the pipeline are connected in series, water flow with the same flow rate sequentially passes through the flowmeter in the ultrasonic water meter to be tested and the standard verification platform, wherein the flow metering result of the default standard verification platform is accurate, and therefore when the water flow passes through the standard verification platform and the flowmeter, uncorrected flow L1 and standard flow L2 can be respectively obtained, and the uncorrected flow L1 is the metering result of the ultrasonic water meter to be tested and has errors. The errors are caused by temperature, and the dynamic viscosity coefficient mu of the water body at different temperatures is different, so that the specific value of the dynamic viscosity coefficient mu can be determined through table lookup. Therefore, on the premise of knowing the pipeline diameter d, the water density rho and the dynamic viscosity coefficient mu, the Reynolds number Re at the temperature can be calculated by only acquiring the test flow velocity v, and the Reynolds number (Reynolds number) is a dimensionless number which can be used for representing the fluid flow condition.
After the uncorrected flow rate L1 is obtained, a test flow rate v can be calculated, which is the quotient of the uncorrected flow rate L1 and the conduit cross-sectional area s, since the conduit cross-sectional area s is known. The uncorrected flow rate L1 and the pipeline sectional area s are brought into a formula, and the corresponding Reynolds number Re can be obtained through the uncorrected flow rate L1.
The compensation coefficient k can be obtained by an average error ei, the average error ei is related to the test volume V1 and the standard volume V2, the test volume V1 and the standard volume V2 can be obtained by calculation through the uncorrected flow L1 and the standard flow L2 in combination with the test time t, and then the average error ei is obtained by a proportional method, so as to determine the corresponding compensation coefficient k under the uncorrected flow L1.
A function model f (Re) =k of the compensation coefficient k and the Reynolds number Re is established, and when the reference of the standard verification platform is not assisted, the curve of the function model f (Re) =k is used as a reference basis for the subsequent acquisition of other compensation coefficients k. For example, under a certain test environment, given temperature data and pipeline data, the corresponding reynolds number Re can be calculated by combining the uncorrected flow rate L1 of the ultrasonic water meter, and the reynolds number Re is brought into a curve of a function model f (Re) =k, the corresponding compensation parameter k can be directly determined, and the compensation parameter k is compensated to the uncorrected flow rate L1 to obtain the corrected flow rate L3.
According to the temperature error correction method, the Reynolds number Re is introduced to obtain the compensation parameter k at a certain specific temperature, the function model f (Re) =k of the Reynolds number Re and the compensation parameter k can be obtained, and then under the condition that a standard verification table is not available, the compensation parameter k is obtained rapidly in a self-lookup and self-comparison mode, the self-uncorrected flow L1 is corrected in real time, adverse effects caused by metering errors caused by temperature are solved, and the metering accuracy of the ultrasonic water meter is improved.
Preferably, the temperature range corresponding to the dynamic viscosity coefficient μ in S03 includes three sections, which are a high temperature acquisition section, a normal temperature acquisition section, and a low temperature acquisition section.
Because the actual temperature of the actual working environment is a section, an independent temperature range model cannot comprehensively and accurately correct the uncorrected flow L1 at each temperature, and therefore three temperature ranges of a high-temperature acquisition section, a normal-temperature acquisition section and a low-temperature acquisition section are respectively established, and three function models f (Re) =k of Reynolds numbers Re and compensation parameters k are correspondingly established.
As the preferable mode of the invention, the testing temperature corresponding to the dynamic viscosity coefficient mu in the high-temperature acquisition section is 50 ℃; the test temperature corresponding to the dynamic viscosity coefficient mu in the normal temperature acquisition section is 24 ℃; and the test temperature corresponding to the dynamic viscosity coefficient mu in the low-temperature acquisition section is 8 ℃.
The test temperature corresponding to the dynamic viscosity coefficient mu in the high-temperature acquisition section is 50 ℃; the test temperature corresponding to the dynamic viscosity coefficient mu in the normal temperature acquisition section is 24 ℃; the test temperature corresponding to the dynamic viscosity coefficient mu in the low-temperature acquisition section is 8 ℃. Which in turn correspond to values of dynamic viscosity coefficients μ of 0.5560, 0.9166 and 1.3878.
Preferably, the temperature error correction method of the ultrasonic water meter of the present invention further comprises:
s04, establishing a compensation history table about the uncorrected flow L1, the corrected flow L3, the dynamic viscosity coefficient mu and the compensation parameter k, and forming a backtracking database.
A temperature error correction system for an ultrasonic water meter, comprising:
the data acquisition module is used for acquiring uncorrected flow L1 obtained by metering the water body by the flowmeter in the ultrasonic water meter, standard flow L2 obtained by metering the water body by the standard verification platform and test time t;
the compensation coefficient calculation module is used for calculating and obtaining a test volume V1 and a standard volume V2 according to the uncorrected flow L1, the standard flow L2 and the test time t; calculating according to the test volume V1 and the standard volume V2 to obtain an average error ei and a compensation coefficient k;
the model building module is used for obtaining a compensation coefficient k and a function model of a Reynolds number Re corresponding to the compensation coefficient k;
and the correction module is used for acquiring the corresponding compensation coefficient k by combining the function model according to the specific temperature condition and the Reynolds number Re corresponding to the test flow velocity v, and acquiring the correction flow L3.
As a preferred mode of the invention, the model building module comprises a Reynolds number Re calculating unit and an information obtaining unit, wherein the information obtaining unit is used for obtaining the water body density rho, the pipeline sectional area s, the dynamic viscosity coefficient mu, the pipeline diameter d and the uncorrected flow rate L1; the Reynolds number Re calculating unit is used for calculating the Reynolds number Re according to the data acquired by the information acquiring unit.
Preferably, the temperature error correction system of the ultrasonic water meter further comprises a dynamic viscosity coefficient mu determining module, wherein the dynamic viscosity coefficient mu determining module is used for determining a corresponding dynamic viscosity coefficient mu according to the test temperature selection value.
Preferably, the temperature error correction system of an ultrasonic water meter further comprises a database module for backtracking analysis, wherein the database module stores a compensation history table related to the uncorrected flow rate L1, the corrected flow rate L3, the dynamic viscosity coefficient μ and the compensation parameter k.
In summary, the invention has the following beneficial effects:
1. the Reynolds number Re is introduced to obtain the compensation parameter k for a certain specific temperature, so that a function model f (Re) =k of the Reynolds number Re and the compensation parameter k can be obtained, and further, under the condition of no standard verification table, the compensation parameter k is rapidly obtained in a self-lookup table self-comparison mode, the self-uncorrected flow L1 is corrected in real time, adverse effects caused by metering errors caused by temperature are solved, and the metering accuracy of the ultrasonic water meter is improved.
2. By establishing the function models f (Re) =k of the three Reynolds numbers Re and the compensation parameters k in the high-temperature acquisition section, the normal-temperature acquisition section and the low-temperature acquisition section, common temperature working conditions can be covered, and no matter what temperature working conditions are, the corresponding compensation parameters k can be found by means of the Reynolds number Re in the most suitable function model, so that uncorrected flow is corrected.
Drawings
FIG. 1 is a flow chart of a temperature error correction method of the ultrasonic water meter;
FIG. 2 is a system block diagram of the temperature error correction system of the ultrasonic water meter;
FIG. 3 is a table of data for Reynolds numbers Re and compensation coefficients for three temperature stages;
FIG. 4 is a graph of Reynolds number Re as a function of compensation coefficient for three temperature stages;
FIG. 5 is a table of metering data at 50;
fig. 6 is a table of metering data at 24 °.
Detailed Description
Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Any person may implement the present disclosure in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
When the test is carried out, the standard verification platform is connected into a pipeline of the ultrasonic water meter to be tested, namely, the standard verification platform and the pipeline are connected in series, water flow with the same flow rate sequentially passes through the flowmeter in the ultrasonic water meter to be tested and the standard verification platform, wherein the flow metering result of the default standard verification platform is accurate, so that when the water flow passes through the flowmeter and the standard verification platform, uncorrected flow L1 and standard flow L2 can be respectively obtained, and the uncorrected flow L1 is the metering result of the ultrasonic water meter to be tested and has errors. The errors are caused by temperature, and the dynamic viscosity coefficient mu of the water body at different temperatures is different, so that the specific value of the dynamic viscosity coefficient mu can be determined through table lookup. Therefore, on the premise of knowing the pipeline diameter d, the water density rho and the dynamic viscosity coefficient mu, the Reynolds number Re at the temperature can be calculated by only acquiring the test flow velocity v, and the Reynolds number (Reynolds number) is a dimensionless number which can be used for representing the fluid flow condition.
As shown in fig. 1, after the uncorrected flow rate L1 is obtained, the test flow rate v can be calculated, which is the quotient of the uncorrected flow rate L1 and the conduit cross-sectional area s, since the conduit cross-sectional area s is known. The uncorrected flow rate L1 and the pipeline sectional area s are brought into a formula, and the corresponding Reynolds number Re can be obtained through the uncorrected flow rate L1.
The compensation coefficient k can be obtained by an average error ei, the average error ei is related to the test volume V1 and the standard volume V2, the test volume V1 and the standard volume V2 can be obtained by calculation through the uncorrected flow L1 and the standard flow L2 in combination with the test time t, and then the average error ei is obtained by a proportional method, so as to determine the corresponding compensation coefficient k under the uncorrected flow L1.
A function model f (Re) =k of the compensation coefficient k and the Reynolds number Re is established, and when the reference of the standard verification platform is not assisted, the curve of the function model f (Re) =k is used as a reference basis for the subsequent acquisition of other compensation coefficients k. For example, under a certain test environment, given temperature data and pipeline data, the corresponding reynolds number Re can be calculated by combining the uncorrected flow rate L1 of the ultrasonic water meter, and the reynolds number Re is brought into a curve of a function model f (Re) =k, the corresponding compensation parameter k can be directly determined, and the compensation parameter k is compensated to the uncorrected flow rate L1 to obtain the corrected flow rate L3.
According to the temperature error correction method, the Reynolds number Re is introduced to obtain the compensation parameter k at a certain specific temperature, the function model f (Re) =k of the Reynolds number Re and the compensation parameter k can be obtained, and then under the condition that a standard verification table is not available, the compensation parameter k is obtained rapidly in a self-lookup and self-comparison mode, the self-uncorrected flow L1 is corrected in real time, adverse effects caused by metering errors caused by temperature are solved, and the metering accuracy of the ultrasonic water meter is improved.
Because the actual temperature of the actual working environment is a section, an independent temperature range model cannot comprehensively and accurately correct the uncorrected flow L1 at each temperature, and therefore three temperature ranges of a high-temperature acquisition section, a normal-temperature acquisition section and a low-temperature acquisition section are respectively established, and three function models f (Re) =k of Reynolds numbers Re and compensation parameters k are correspondingly established. Wherein the test temperature corresponding to the dynamic viscosity coefficient mu in the high-temperature acquisition section is 50 ℃; the test temperature corresponding to the dynamic viscosity coefficient mu in the normal temperature acquisition section is 24 ℃; the test temperature corresponding to the dynamic viscosity coefficient mu in the low-temperature acquisition section is 8 ℃. Which in turn correspond to values of dynamic viscosity coefficients μ of 0.5560, 0.9166 and 1.3878. At this time, a plurality of sets of tests are performed, such as the test data table shown in fig. 3. And respectively obtaining a plurality of Reynolds number Re values at three temperatures, and calculating an average error ei and a compensation coefficient k by combining the test volume V1 and the standard volume V2, and establishing a function model of f (Re) =k at the moment, as shown in fig. 4, 5 and 6.
The temperature error correction system of the ultrasonic water meter is shown in fig. 2, and comprises a data acquisition module, a compensation coefficient calculation module, a model establishment module, a correction module, a dynamic viscosity coefficient mu determination module and a database module. The data acquisition module is used for acquiring uncorrected flow L1 obtained by measuring a water body by a flowmeter in the ultrasonic water meter, standard flow L2 obtained by measuring the water body by a standard verification platform and test time t; the calculation module is used for calculating according to the uncorrected flow L1, the standard flow L2 and the test time t to obtain a test volume V1 and a standard volume V2; calculating according to the test volume V1 and the standard volume V2 to obtain an average error ei and a compensation coefficient k; the model building module obtains a compensation coefficient k and a function model of a Reynolds number Re corresponding to the compensation coefficient k; the correction module is used for acquiring a corresponding compensation coefficient k according to a specific temperature condition and a Reynolds number Re corresponding to the test flow velocity v and combining a function model to acquire a corrected flow L3; the dynamic viscosity coefficient mu determining module is used for determining a corresponding dynamic viscosity coefficient mu according to the test temperature selected value; the database module stores a compensation history table related to the uncorrected flow L1, the corrected flow L3, the dynamic viscosity coefficient mu and the compensation parameter k. In addition, the model building module comprises a Reynolds number Re calculating unit and an information acquiring unit, wherein the information acquiring unit is used for acquiring the water body density rho, the pipeline sectional area s, the dynamic viscosity coefficient mu, the pipeline diameter d and the uncorrected flow L1; the Reynolds number Re calculating unit is used for calculating the Reynolds number Re according to the data acquired by the information acquiring unit.
In summary, the temperature error correction method and system of the ultrasonic water meter can comprehensively evaluate adverse effects of temperature changes on metering errors of the flowmeter in the water meter, eliminate errors by combining with a scientific compensation mode, and greatly improve metering accuracy and reliability of the ultrasonic water meter.
The foregoing description of various embodiments of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvements in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (8)
1. The temperature error correction method of the ultrasonic water meter is characterized by comprising the following steps of:
s01, carrying out water flow test on a flowmeter in an ultrasonic water meter, and measuring a water body by the flowmeter in the ultrasonic water meter to obtain uncorrected flow L1; the standard verification platform measures the water body to obtain standard flow L2, and the corresponding test volume V1 and standard volume V2 are calculated by combining the test time t, wherein the formulas are shown in formulas (1-1) and (1-2):
V 1 ＝t×L 1 (1-1)
V 2 ＝t×L 2 (1-2)
the uncorrected flow L1 is an actual flow value, the standard flow L2 is an accurate reference flow value, and t is test time;
s02, calculating an average error ei according to the test volume V1 and the standard volume V2, wherein a formula is shown in a formula (1-3); calculating a compensation coefficient k according to the average error ei, wherein the formula is shown in the formula (1-4);
s03, establishing a function model f (Re) =k of the compensation coefficient k and the Reynolds number Re, wherein the formulas are shown in formulas (1-5), (1-6) and (1-7);
wherein Re represents the Reynolds number at a specific temperature, and ρ is the water density; v is the test flow rate; s is the sectional area of the pipeline; mu is the dynamic viscosity coefficient of the water body at a specific temperature; d is the diameter of the pipeline;
s04, when a plurality of groups of uncorrected flow L1 data under a certain temperature and a certain pipeline diameter d are measured, the data are brought into the function model f (Re) =k to obtain a corresponding Reynolds number Re; determining a compensation coefficient k according to the Reynolds number Re; and calculating to obtain a corrected flow L3, wherein the formula is shown in the formula (1-8);
L 3 ＝k×L 1 (1-8)
wherein k is a compensation coefficient; l3 is the corrected flow.
2. The method for correcting temperature error of ultrasonic water meter according to claim 1, wherein the temperature range corresponding to the dynamic viscosity coefficient μ in S03 comprises three sections, namely a high temperature acquisition section, a normal temperature acquisition section and a low temperature acquisition section.
3. The method for correcting the temperature error of an ultrasonic water meter according to claim 2, wherein the test temperature corresponding to the dynamic viscosity coefficient μ in the high-temperature acquisition section is 50 ℃; the test temperature corresponding to the dynamic viscosity coefficient mu in the normal temperature acquisition section is 24 ℃; and the test temperature corresponding to the dynamic viscosity coefficient mu in the low-temperature acquisition section is 8 ℃.
4. The method for correcting temperature error of an ultrasonic water meter according to claim 1, further comprising:
s04, establishing a compensation history table about the uncorrected flow L1, the corrected flow L3, the dynamic viscosity coefficient mu and the compensation parameter k, and forming a backtracking database.
5. A temperature error correction system for an ultrasonic water meter, comprising:
the data acquisition module is used for acquiring uncorrected flow L1 obtained by metering the water body by the flowmeter in the ultrasonic water meter, standard flow L2 obtained by metering the water body by the standard verification platform and test time t;
the compensation coefficient calculation module is used for calculating and obtaining a test volume V1 and a standard volume V2 according to the uncorrected flow L1, the standard flow L2 and the test time t; calculating according to the test volume V1 and the standard volume V2 to obtain an average error ei and a compensation coefficient k;
the model building module is used for obtaining a compensation coefficient k and a function model of a Reynolds number Re corresponding to the compensation coefficient k;
and the correction module is used for acquiring the corresponding compensation coefficient k by combining the function model according to the specific temperature condition and the Reynolds number Re corresponding to the test flow velocity v, and acquiring the correction flow L3.
6. The system for correcting the temperature error of the ultrasonic water meter according to claim 5, wherein the model building module comprises a Reynolds number Re calculating unit and an information obtaining unit, wherein the information obtaining unit is used for obtaining the water body density rho, the pipeline sectional area s, the dynamic viscosity coefficient mu, the pipeline diameter d and the uncorrected flow L1; the Reynolds number Re calculating unit is used for calculating the Reynolds number Re according to the data acquired by the information acquiring unit.
7. The system for temperature error correction of an ultrasonic water meter according to claim 5, further comprising a dynamic viscosity coefficient μ determination module for determining a corresponding dynamic viscosity coefficient μ according to the test temperature selection value.
8. The system for temperature error correction of an ultrasonic water meter of claim 7, wherein,
the temperature error correction system of the ultrasonic water meter further comprises a database module for backtracking analysis, wherein a compensation history record table related to the uncorrected flow L1, the corrected flow L3, the dynamic viscosity coefficient mu and the compensation parameter k is stored in the database module.
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