Integrated gate flow measurement and calibration method

Abstract

The invention discloses an integrated gate flow measurement and calibration method, relates to the technical field of gate flow, solves the problem that an optimal coefficient combination cannot be quickly found due to the fact that model calibration is not automatically carried out, and specifically presets various model algorithms by fully considering the characteristics of different water outlets in actual engineering. An operator can conveniently select an adaptive algorithm and accurately confirm the current gate passing flow in real time only according to the confirmed flow state and engineering parameters, the accuracy and timeliness of flow measurement and calculation are effectively improved, diversified engineering scene requirements are met, and the flow measurement and calculation efficiency is improved based on measured parameters and actual working conditions of a standard flow meter. A specific and practical flow calculation formula is provided, and an operator can flexibly select and use the formula according to the actual situation on site. No matter a square gate culvert or a circular gate culvert, under different gate states and flow states, the undetermined flow can be accurately calculated, and the comprehensiveness and reliability of flow measurement are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of gate flow measurement, and in particular to an integrated gate flow measurement and calibration method. Background Art

[0002] After the gate is installed, it is necessary to measure the water level before and after the gate according to the channel conditions on site, calculate the flow rate based on the water level before and after the gate and the gate opening, and then calibrate the calculated flow rate of the gate to find the coefficient that can represent the gate flow rate. This process requires multiple comparative measurements and calibrations at different water levels, flow rates, and openings. It is very labor-intensive.

[0003] The application with publication number CN108534843B discloses a single gate flow calibration method and device for an open channel water transfer channel, the method comprising the following steps: 1) using a measuring device to collect data related to the flow rate of the gate and its corresponding gate opening and water head difference; 2) comparing the flow data and the gate opening in the measured data to obtain a ratio; 3) obtaining a certain gate flow rate and the upstream and downstream water head difference Δz corresponding to the gate opening through the upstream and downstream water depths; 4) establishing a flow calibration formula, and according to the measured data, using a mathematical regression analysis method to calibrate the three parameters A, B, and C in the formula to determine the final CAP model; 5) by actually measuring the upstream and downstream water head difference Δz and the gate opening e, bringing them into the obtained CAP model, and calculating the corresponding gate flow rate Q; the gate flow rate calculated by the method of the present invention has high accuracy, and the method is easy to implement.

[0004] Multiple comparative measurements and calibrations at different water levels, flow rates and openings are very labor-intensive. Automatic flow calibration and correction models require the installation of flow meters for measurement, which increases equipment costs and installation and maintenance costs. Equipment installation can be reduced, and system complexity can be reduced. The model is not automatically calibrated, which makes it impossible to quickly find the optimal coefficient combination. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides an integrated gate flow measurement and calibration method, which solves the problem that the model calibration is not automatically performed, resulting in the inability to quickly find the optimal coefficient combination.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: an integrated gate flow measurement and calibration method, comprising the following steps:

[0007] Step 1: Obtain the water depth and gate opening height data, and determine the flow state based on the upstream and downstream water levels of the gate and the gate opening height data. The specific method is as follows:

[0008] S11. Calibrate the determined gate opening height data as hW, calibrate the upstream water depth as H, and calibrate the downstream water depth as hH. Based on the numerical expressions of hW, H, and hH, confirm the flow state:

[0009] If hW÷HS>X1 and hH÷H<X2, the current flow pattern is determined as free flow with gates fully open; if hW÷H>X1 and hH÷H≥X2, the current flow pattern is determined as flooded flow with gates fully open; if hH<hW, the current flow pattern is determined as free flow controlled by gates;

[0010] If hW, H and hH do not meet any of the above assessment criteria, the current flow pattern is determined to be gate-controlled submerged flow;

[0011] Among them, X1 and X2 are both preset values;

[0012] Step 2: Select the relevant model algorithm based on the confirmed flow pattern and the associated engineering parameters. The model algorithms are all preset algorithms, and the engineering parameters include the preset flow coefficient and gate width, circular culvert radius and gate opening height. Different model algorithm tables are used for algorithm selection according to the different discharge outlets actually used. The specific method is as follows:

[0013] When the current outlet is a circular culvert outlet, confirm the current flow pattern:

[0014] If the current flow state is a free flow with the gate fully open, use Confirm the current gate flow rate Q, where r is the radius of the circular culvert and m is the preset flow coefficient;

[0015] If the current flow state is a flooded flow with the gate fully open, use Confirm the current gate flow rate Q, where φ is the preset flow coefficient, g is the gravity acceleration, and r is the radius of the circular culvert;

[0016] If the current flow state belongs to gate-controlled free flow, then use Confirm the current gate flow rate Q, where μ is the preset flow coefficient, h ω is the gate opening height (m);

[0017] If the current flow state belongs to gate-controlled flooding flow, use Confirm the current gate flow rate Q, where μ' is the preset flow coefficient;

[0018] When the drain outlet currently used is a rectangular culvert drain outlet:

[0019] If the current flow state is a free flow with the gate fully open, use Confirm the current gate flow rate Q, where b is the gate width;

[0020] If the current flow state is a flooded flow with the gate fully open, use Confirm the current gate flow rate Q;

[0021] If the current flow state belongs to gate-controlled free flow, then use Confirm the current gate flow rate Q;

[0022] If the current flow state belongs to gate-controlled flooding flow, use Confirm the current gate flow rate Q;

[0023] Step 3: Based on the measured parameters of the standard flow meter and the actual working conditions of the current gate site, select a specific flow calculation formula and confirm the pending flow. The specific method is as follows:

[0024] Confirm the actual working conditions of the current gate site and select the formula. The selected formula includes: where h g is the gate opening height, b is the gate width, u is the model coefficient, g is the gravity acceleration, H is the upstream water depth before the gate, and ΔZ is the water level difference before and after the gate;

[0025] Based on the selected formula, confirm the undetermined flow rate q;

[0026] Step 4: Based on the currently confirmed gate flow and the determined pending flow, the collected and calculated raw data is compared with the data of the standard flow meter, and the raw data is calibrated. Based on the polynomial iterative processing method, the flow coefficient is calibrated and put into use. The specific sub-steps are:

[0027] Based on the confirmed gate flow Q and the determined pending flow q, substitute the two into; Qs = Aq 2 +Bq+C calibration coefficient formula, calibration coefficients A, B and C are calibrated and adjusted. Each time a set of calibration adjustment related processes is executed, error confirmation is performed. The error confirmation method is: |Qs-Q|÷Q=Wc Confirm the error and evaluate whether the error value meets: Wc≤3%;

[0028] If not, continue to make calibration adjustments until the determined error meets this assessment condition, and confirm that the calibrated flow coefficients A, B and C are put into use;

[0029] If satisfied, the calibrated flow coefficients A, B and C are confirmed and put into use.

[0030] Preferably, the flow states include: free flow with gates fully open, submerged flow with gates fully open, free flow with gates controlled, and submerged flow with gates controlled.

[0031] The present invention provides an integrated gate flow measurement and calibration method. Compared with the prior art, it has the following beneficial effects:

[0032] The present invention takes full account of the characteristics of different water outlets in actual projects and presets multiple model algorithms in a targeted manner. Operators only need to select the adaptation algorithm based on the confirmed flow state and project parameters to confirm the current gate flow in real time and accurately, effectively improving the accuracy and timeliness of flow measurement and meeting the needs of diversified project scenarios;

[0033] Based on the measured parameters of the standard flow meter and the actual working conditions, a specific and practical flow calculation formula is provided, which the operator can flexibly select according to the actual situation on site. Whether it is a square culvert or a circular culvert, the flow to be determined can be accurately calculated under different gate states and flow states, ensuring the comprehensiveness and reliability of flow measurement;

[0034] The flow coefficient is calibrated using a polynomial iterative processing method. During the calibration process, each adjustment is strictly confirmed for error to ensure that the error value satisfies Wc≤3%. This automatic iterative calculation, combined with a mechanism for back-calculation and comparison with standard flow meter data, not only achieves high-precision calibration of the flow coefficient, but also automatically shuts down the calibration function after the accuracy requirement is met, allowing the model to be directly put into production, greatly improving the intelligence and reliability of the entire flow measurement and calibration system. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0036] 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.

[0037] See also Figure 1 , the present application provides an integrated gate flow measurement and calibration method, comprising the following steps:

[0038] Step 1: Obtain the water depth and gate opening height data, and judge the flow pattern according to the upstream and downstream water levels of the gate and the gate opening height data, where the flow pattern includes: gate fully open free flow, gate fully open submerged flow, gate controlled free flow, gate controlled submerged flow, and the specific method for judging the flow pattern is:

[0039] S11. Calibrate the determined gate opening height data as hW, calibrate the upstream water depth as H, and calibrate the downstream water depth as hH. Based on the numerical expressions of hW, H, and hH, confirm the flow state:

[0040] If hW÷HS>X1 and hH÷H<X2, the current flow pattern is determined to be a free flow with the gate fully open;

[0041] If hW÷H>X1 and hH÷H≥X2, the current flow pattern is determined as gate-fully-open submerged flow; if hH<hW, the current flow pattern is determined as gate-controlled free flow (the gate is not fully open).

[0042] If hW, H and hH do not meet any of the above assessment criteria, the current flow pattern is judged as gate-controlled flooding flow (which also belongs to the case where the gate is not fully opened);

[0043] Among them, X1 and X2 are preset values, generally between 0.5-0.8, and their specific values ​​are set by relevant operators based on experience;

[0044] Step 2: Select relevant model algorithms based on the confirmed flow pattern and the associated engineering parameters, where the model algorithms are all preset algorithms, and the engineering parameters include the preset flow coefficient and gate width, circular culvert radius and gate opening height. Different model algorithm tables are used for algorithm selection according to the different discharge outlets actually used, and the current gate flow rate is confirmed in real time;

[0045] The specific method for confirming the current gate flow rate is as follows:

[0046] When the current outlet is a circular culvert outlet, confirm the current flow pattern:

[0047] If the current flow state is a free flow with the gate fully open, use Confirm the current gate flow rate Q, in (m 3 / second), where r is the radius of the circular culvert in meters, and m is the preset flow coefficient, which is determined in advance based on experience;

[0048] If the current flow state is a flooded flow with the gate fully open, use Confirm the current gate flow rate Q, where φ is the preset flow coefficient, g is the gravity acceleration, and r is the radius of the circular culvert;

[0049] If the current flow state belongs to gate-controlled free flow, then use Confirm the current gate flow rate Q, where μ is the preset flow coefficient, h ω is the gate opening height (m);

[0050] If the current flow state belongs to gate-controlled flooding flow, use Confirm the current gate flow rate Q, where μ' is the preset flow coefficient;

[0051] When the drain outlet currently used is a rectangular culvert drain outlet:

[0052] If the current flow state is a free flow with the gate fully open, use Confirm the current gate flow rate Q, where b is the gate width;

[0053] If the current flow state is a flooded flow with the gate fully open, use Confirm the current gate flow rate Q;

[0054] If the current flow state belongs to gate-controlled free flow, then use Confirm the current gate flow rate Q;

[0055] If the current flow state belongs to gate-controlled flooding flow, use Confirm the current gate flow rate Q;

[0056] Step 3: Based on the measured parameters of the standard flow meter and the actual working conditions of the current gate site, a specific flow calculation formula is selected and the pending flow is confirmed. The specific method for confirming the pending flow is as follows:

[0057] Confirm the actual working conditions of the current gate site and select the formula. The actual working conditions are determined in advance by the relevant operators. The selected formulas include: where h g is the gate opening height, b is the gate width, u is the model coefficient, g is the gravity acceleration, H is the upstream water depth before the gate, and ΔZ is the water level difference before and after the gate;

[0058] Based on the selected formula, confirm the undetermined flow rate q;

[0059] Step 4: Based on the currently confirmed gate flow and the determined pending flow, the collected and calculated raw data are compared with the data of the standard flow meter, and the raw data are calibrated. Based on the polynomial iterative processing method, the flow coefficient is calibrated and the calibrated flow coefficient is put into use. The specific sub-steps for calibrating the flow coefficient are as follows:

[0060] S41, based on the confirmed gate flow Q and the determined pending flow q, substitute the two into; Qs = Aq 2 +Bq+C calibration coefficient formula, calibration coefficients A, B and C are calibrated and adjusted. Each time a set of calibration adjustment related processes is executed, error confirmation is performed. The error confirmation method is: |Qs-Q|÷Q=Wc Confirm the error and evaluate whether the error value meets: Wc≤3%;

[0061] If not, continue to make calibration adjustments until the determined error meets this assessment condition, and confirm that the calibrated flow coefficients A, B and C are put into use;

[0062] If satisfied, the calibrated flow coefficients A, B and C are confirmed and put into use.

[0063] Among them, the flow calculation is suitable for square culverts, circular culverts, calculations under different gate states and flow states, and the calibration coefficient is automatically iterated and calculated through the calibration module. After the iteration is completed, the data of the standard flow meter is compared by back calculation to ensure that the error range is within 3%, and the calibration function is automatically closed; the model is put into production use.

[0064] By accurately obtaining the water depth and gate opening height data, based on the strictly set numerical comparison relationship, such as hW÷H, hH÷H, etc., combined with the preset empirical value range, it is possible to accurately judge whether the gate is in different flow states such as fully open free flow, fully open submerged flow, controlled free flow or controlled submerged flow, laying a solid foundation for subsequent accurate flow measurement and greatly reducing the flow calculation deviation caused by misjudgment of flow state;

[0065] Taking into full consideration the characteristics of different drainage outlets (circular culvert drainage outlets, rectangular culvert drainage outlets) in actual projects, a variety of model algorithms are preset in a targeted manner. Operators can conveniently select the adaptation algorithm based on the confirmed flow state and project parameters, and confirm the current gate flow in real time and accurately, effectively improving the accuracy and timeliness of flow measurement and meeting the needs of diverse engineering scenarios;

[0066] Based on the measured parameters of the standard flow meter and the actual working conditions, a specific and practical flow calculation formula is provided, which the operator can flexibly select according to the actual situation on site. Whether it is a square culvert or a circular culvert, the flow to be determined can be accurately calculated under different gate states and flow states, ensuring the comprehensiveness and reliability of flow measurement;

[0067] The flow coefficient is calibrated using a polynomial iterative processing method. During the calibration process, each adjustment is strictly confirmed for error, and the error is accurately assessed using the formula |Qs-Q|÷Q=Wc to ensure that the error value satisfies Wc≤3%. This automatic iterative calculation, combined with a mechanism for back-calculation and comparison with standard flow meter data, not only achieves high-precision calibration of the flow coefficient, but also automatically turns off the calibration function after the accuracy requirements are met, allowing the model to be directly put into production, greatly improving the intelligence and reliability of the entire flow measurement and calibration system, and providing strong technical support for accurate flow control in related fields such as water conservancy projects.

[0068] Some of the data in the above formulas are dimensionless and numerically calculated. Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0069] The above embodiments are only used to illustrate the technical method of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.

Claims

1. An integrated gate flow measurement and calibration method, characterized in that: The following steps are involved: Step 1: Acquire the water depth and gate opening height data, and determine the flow state based on the upstream and downstream water levels of the gate and the gate opening height data; Step 2: Select relevant model algorithms based on the confirmed flow pattern and the associated engineering parameters, where the model algorithms are all preset algorithms, and the engineering parameters include preset flow coefficients and gate widths, circular culvert radius, and gate opening heights. Different model algorithm tables are used for algorithm selection according to different discharge outlets actually used; Step 3: Based on the measured parameters of the standard flow meter and the actual working conditions of the current gate site, select a specific flow calculation formula and confirm the pending flow; Step 4: Based on the currently confirmed flow rate through the gate and the determined pending flow rate, the collected and calculated original data are compared with the data of the standard flow meter, and the original data is calibrated. Based on the polynomial iterative processing method, the flow coefficient is calibrated and put into use.

2. The integrated gate flow measurement and calibration method according to claim 1 is characterized in that: In the step 1, the flow states include: free flow with gates fully open, submerged flow with gates fully open, free flow controlled by gates, and submerged flow controlled by gates.

3. The integrated gate flow measurement and calibration method according to claim 2 is characterized in that: In step 1, the specific method of performing flow state judgment is: S11. Calibrate the determined gate opening height data as hW, calibrate the upstream water depth as H, and calibrate the downstream water depth as hH. Based on the numerical expressions of hW, H, and hH, confirm the flow state: If hW÷HS>X1 and hH÷H<X2, the current flow pattern is determined to be a free flow with the gate fully open; If hW÷H>X1 and hH÷H≥X2, the current flow pattern is determined to be flooded flow with the gate fully opened; If hH<hW, the current flow pattern is determined to be gate-controlled free flow; If hW, H and hH do not meet any of the above assessment criteria, the current flow pattern is determined to be gate-controlled submerged flow; Wherein, X1 and X2 are both preset values.

4. The integrated gate flow measurement and calibration method according to claim 3 is characterized in that: In step 2, the specific method of confirming the current gate flow rate is: When the current outlet is a circular culvert outlet, confirm the current flow pattern: If the current flow state is a free flow with the gate fully open, use Confirm the current gate flow rate Q, where r is the radius of the circular culvert and m is the preset flow coefficient; If the current flow state is a flooded flow with the gate fully open, use Confirm the current gate flow rate Q, where φ is the preset flow coefficient, g is the gravity acceleration, and r is the radius of the circular culvert; If the current flow state belongs to gate-controlled free flow, then use Confirm the current gate flow rate Q, where μ is the preset flow coefficient, h ω is the gate opening height (m); If the current flow state belongs to gate-controlled flooding flow, use Confirm the current gate flow rate Q, where μ' is the preset flow coefficient.

5. The integrated gate flow measurement and calibration method according to claim 4, characterized in that: In step 2, the specific method of confirming the current gate flow rate also includes: When the drain outlet currently used is a rectangular culvert drain outlet: If the current flow state is a free flow with the gate fully open, use Confirm the current gate flow rate Q, where b is the gate width; If the current flow state is a flooded flow with the gate fully open, use Confirm the current gate flow rate Q; If the current flow state belongs to gate-controlled free flow, then use Confirm the current gate flow rate Q; If the current flow state belongs to gate-controlled flooding flow, use Confirm the current gate flow rate Q.

6. The integrated gate flow measurement and calibration method according to claim 1, characterized in that: In step 3, the specific method for confirming the flow to be determined is: Confirm the actual working conditions of the current gate site and select the formula. The selected formula includes: where h g is the gate opening height, b is the gate width, u is the model coefficient, g is the gravity acceleration, H is the upstream water depth before the gate, and ΔZ is the water level difference before and after the gate; Based on the selected formula, the undetermined flow rate q is confirmed.

7. The integrated gate flow measurement and calibration method according to claim 6, characterized in that: In step 4, the specific sub-steps for determining the flow coefficient are: Based on the confirmed gate flow Q and the determined pending flow q, substitute the two into; Qs = Aq 2 +Bq+C calibration coefficient formula, calibration coefficients A, B and C are calibrated and adjusted. Each time a set of calibration adjustment related processes is executed, error confirmation is performed. The error confirmation method is: |Qs-Q|÷Q=Wc Confirm the error and evaluate whether the error value meets: Wc≤3%; If not, continue to make calibration adjustments until the determined error meets this assessment condition, and confirm that the calibrated flow coefficients A, B and C are put into use; If satisfied, the calibrated flow coefficients A, B and C are confirmed and put into use.

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