CN101750136B - Dry calibration method of electromagnetic flow meter based on intraductal magnetic field simulation numerical calculation - Google Patents
Dry calibration method of electromagnetic flow meter based on intraductal magnetic field simulation numerical calculation Download PDFInfo
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- CN101750136B CN101750136B CN2009102446073A CN200910244607A CN101750136B CN 101750136 B CN101750136 B CN 101750136B CN 2009102446073 A CN2009102446073 A CN 2009102446073A CN 200910244607 A CN200910244607 A CN 200910244607A CN 101750136 B CN101750136 B CN 101750136B
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Abstract
The invention relates to a dry calibration method of an electromagnetic flow meter based on intraductal magnetic field simulation numerical calculation. The method comprises: using a three-dimensional electromagnetic numerical calculation program, calculating the three-dimensional magnetic field generated by a magnet exciting coil in the pipe of the sensor of the electromagnetic flow meter by precisely establishing a magnet exciting coil model, further combining with pipe section geometric dimension and a mathematical model to calculate the conversion coefficient of the primary sensor of the electromagnetic flow meter, and combining with a simulator method to realize the high-precision dry calibration of the electromagnetic flow meter. The method can avoid the high cost caused by real flow calibration and the complex measurement of spatial three-dimensional magnetic field in the traditional dry calibration methods, and can realize the evaluation and calibration of the electromagnetic flow meter under different media in all flow field environments.
Description
Technical field
The present invention relates to be applied to the scaling method of electromagnetic flowmeter, relate in particular to a kind of electromagnetic flowmeter dried calibration method that calculates based on pipe internal magnetic field simulation numerical.
Background technology
At present, the caliberating device of electromagnetic flowmeter is divided into real failing to be sold at auction and decides two kinds of device and dried caliberating devices.Fail to be sold at auction in fact and decide device and constitute, cross electromagnetic flowmeter with the flow of liquid of actual flow and realize demarcating by high-power pumping plant, pipeline and large-scale liquid storage tank etc.Present stage, the wet scaling method of electromagnetic flowmeter is simple because of its calibration principle, degree of accuracy is high is widely used; On the contrary, it is ripe that electromagnetic flowmeter dried calibration method correlation theory is still owed, and many achievements in research also do not reach industrial application requirements.But electromagnetic flowmeter is done to demarcate and is had the incomparable advantage of many wet scaling methods, gathers around to have broad application prospects, and therefore many in the world researchers and electromagnetic flowmeter manufacturer all particularly pay close attention to this technology.
Electromagnetic flowmeter is done the notion of demarcating and is proposed by British Shercliff; He has set up the electromagnetic flowmeter basic model and has pointed out: as long as can obtain space three-dimensional Distribution of Magnetic Field information, electrode size, electrode position, pipeline section internal diameter and velocity flow profile information in the pipeline section; Just can calculate the sensing conversion coefficient one time; Thereby realize need not the electromagnetic flowmeter demarcation under the real medium situation, promptly electromagnetic flowmeter is done and is demarcated.Yet, the following period of time after dried standardization proposes, people can't accomplish accurately to obtain space three-dimensional Distribution of Magnetic Field information in the pipeline section, and it is very low and error is very big directly to measure the obvious efficient of three-dimensional magnetic field distributed intelligence.There is the scientific worker to propose the parsing mathematical model of Laplace's equation in the cylindrical space that obtains under the Newman boundary condition is incorporated in the calculating of electromagnetic flowmeter three-dimensional magnetic field distribution; Only need to measure the normal direction magnetic flux distribution on the electromagnetic flowmeter pipeline section inwall, just can be through three-dimensional magnetic field between this calculated with mathematical model clearancen.Utilize this principle the dried caliberating device of the electromagnetic flowmeter (patent No.: 200610052941.5 of point by point scanning mode to occur adopting; 200610052942.X).But no matter which kind of installs, and the mode of point by point scanning all means complicated point by point scanning process and adopts heavy mechanical driving mechanism.Zhejiang University has proposed the dried caliberating device of a kind of portable electromagnetic flowmeter (patent No.: 200810121483.5); Obtain normal direction magnetic flux distribution in the pipeline section with the measurement paster; But the paster measurement result depends critically upon its bearing accuracy; And be easy to damage the sensor on the paster, the recycling degree is not high.
Summary of the invention
The invention provides a kind of electromagnetic flowmeter dried calibration method that calculates based on pipe internal magnetic field simulation numerical.This method adopts 3 D electromagnetic Flow Field Numerical calculation procedure; Through accurately setting up the field coil model; Calculate the three-dimensional magnetic field of field coil in the generation of electromagnet flow meter sensor pipe interior; Further combine pipeline section physical dimension and calculated with mathematical model to go out the conversion coefficient of electromagnetic flowmeter primary transducer, thereby do demarcation in conjunction with the high precision of simulator method realization electromagnetic flowmeter; The measurement of the complex spatial three-dimensional magnetic field that this method can be avoided need carrying out in the real fixed expensive and conventional dry standardization that is brought of failing to be sold at auction can realize assessment and the demarcation of electromagnetic flowmeter under different medium and various flow fields environment.
Wherein, the geometric parameter of said field coil comprises field coil shape, size and installation site thereof.
Wherein, said geometric model is set up according to the geometric parameter of the field coil of PC acquisition.
Wherein, said magnetic induction density distributes and is calculated by 3 D electromagnetic Flow Field Numerical calculation procedure.Said geometric model is imported the numerical simulation calculation procedure, carry out the numerical evaluation that conduction current distributes and magnetic induction density distributes, obtain the distributed in three dimensions of magnetic induction density in conjunction with the exciting current size.
Wherein, a said sensing conversion coefficient obtains space three-dimensional Distribution of Magnetic Field information in the pipeline section by the electromagnetic-field simulation calculation procedure, combines known in advance electrode size, electrode position, pipeline section internal diameter and velocity flow profile information again, calculates.Combine the simulator method to calculate the secondary conversion coefficient at last, accomplish the dried demarcation of electromagnetic flowmeter.
Description of drawings
Fig. 1 is based on the process flow diagram of the electromagnetic flowmeter dried calibration method of pipe internal magnetic field simulation numerical calculating;
Embodiment
Obtain the parameters of field coil shape and installation site thereof, consider the material parameter of pipeline simultaneously
Whether (magnetic permeability), physical dimension, coil have the influence to magnetic field such as gib screw of pole shoe, coil,
Obtain in PC, accurately to set up the coil geometric model after the data.After PC is set up geometric model, with several
What model imports in the 3 D electromagnetic numerical evaluation program is carried out the numerical evaluation that conduction current distributes and magnetic induction density distributes.
As shown in Figure 1, calibration process is divided into following steps:
One, obtains the field coil parameter.Method can have multiple: as directly obtain the position distribution of field coil, coil geometric parameter from design drawing; Perhaps can't be directly when producer directly obtains the coil parameters, utilize NI Vision Builder for Automated Inspection to obtain the field coil image, obtain each modeling parameters of field coil through graphical analysis.
Two, field coil Geometric Modeling.After obtaining coil parameter, carry out the Model Reconstruction of field coil with the Geometric Modeling program, and it is imported in the 3 D electromagnetic numerical evaluation program.
Three, the 3 D electromagnetic Flow Field Numerical is calculated.In 3 D electromagnetic numerical evaluation program, carry out the numerical evaluation that the field coil conduction current distributes and magnetic induction density distributes; Make it reach quick convergence through regulating the model finite element grid; And get the accurate result of calculation that the best iterations of its convergence obtains the field coil induced field, guarantee the accuracy of simulation calculation.
Four, conversion coefficient of calculating sensor.Obtain in the pipeline section combining known in advance electrode size, electrode position, pipeline section internal diameter and velocity flow profile information again after the space three-dimensional Distribution of Magnetic Field information with the method for electromagnetic field simulation calculation, just can calculate the sensing conversion coefficient one time.Accomplish the dried demarcation of electromagnetic flowmeter, also need realize the dried demarcation of electromagnetic flowmeter secondary converter.The simulator method is generally adopted in the dried demarcation of the secondary converter of electromagnetic flowmeter at present, promptly simulates the output of primary transducer with simulator output.Realize the demarcation of secondary converter, the simulator method is very ripe at present, so the present invention continues to use the method.Realize the dried demarcation of electromagnetic flowmeter at last, shown in accompanying drawing 1.
In sum, the present invention can be used for the free-throw line loop-shaped, arbitrarily caliber size, the dried demarcation of the electromagnetic flowmeter of pipe shape arbitrarily.
More than to the description of the present invention and embodiment thereof, be not limited thereto, only be one of embodiment of the present invention shown in the accompanying drawing.Under the situation that does not break away from the invention aim,, all belong to protection domain of the present invention without creatively designing and similar structure of this technical scheme or embodiment.
Claims (5)
1. electromagnetic flowmeter dried calibration method that calculates based on pipe internal magnetic field simulation numerical; It is characterized in that: said method is at first obtained the geometric parameter of field coil; And accurately set up the field coil geometric model in view of the above; Import 3 D electromagnetic numerical evaluation program, calculate field coil, further combine pipeline section physical dimension, electrode size, electrode position and the law of electromagnetic induction to calculate the conversion coefficient of electromagnetic flowmeter primary transducer in the three-dimensional magnetic field that pipe interior produces; Combine the simulator method to calculate secondary sensing conversion coefficient at last, accomplish the dried demarcation of electromagnetic flowmeter; This method can be avoided the measurement of complex spatial three-dimensional magnetic field in the real fixed expensive and conventional dry standardization that is brought of failing to be sold at auction, and can realize assessment and the demarcation of electromagnetic flowmeter under different medium and various flow fields environment.
2. according to the described a kind of electromagnetic flowmeter dried calibration method that calculates based on pipe internal magnetic field simulation numerical of claim 1, it is characterized in that the geometric parameter of said field coil comprises field coil shape, size and installation site thereof.
3. according to the described a kind of electromagnetic flowmeter dried calibration method that calculates based on pipe internal magnetic field simulation numerical of claim 1, it is characterized in that of the geometric parameter foundation of said field coil geometric model according to the field coil of PC acquisition.
4. according to the described a kind of electromagnetic flowmeter dried calibration method that calculates based on pipe internal magnetic field simulation numerical of claim 1, it is characterized in that said field coil is calculated by 3 D electromagnetic numerical evaluation program in the three-dimensional magnetic field that pipe interior produces; Said field coil geometric model is imported 3 D electromagnetic numerical evaluation program, carry out the numerical evaluation that conduction current distributes and magnetic induction density distributes, obtain the distributed in three dimensions of magnetic induction density in conjunction with the exciting current size.
5. according to the described a kind of electromagnetic flowmeter dried calibration method that calculates based on pipe internal magnetic field simulation numerical of claim 1; The conversion coefficient that it is characterized in that said primary transducer; Obtain space three-dimensional Distribution of Magnetic Field information in the pipeline section by 3 D electromagnetic numerical evaluation program, combine known in advance electrode size, electrode position, pipeline section internal diameter and velocity flow profile information again, calculate; Combine the simulator method to calculate secondary sensing conversion coefficient at last, accomplish the dried demarcation of electromagnetic flowmeter.
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| CN105974295A (en) * | 2016-03-29 | 2016-09-28 | 电子科技大学 | Method for deriving physical properties based on electrical characteristics of terahertz Schottky diode |
| CN106227982A (en) * | 2016-08-27 | 2016-12-14 | 国网冀北电力有限公司电力科学研究院 | A kind of electromagnetic relay static characteristic computational methods and device |
| CN109781215B (en) * | 2019-01-17 | 2020-07-17 | 合肥工业大学 | Numerical simulation method of multi-field coupling induced electromotive force of electromagnetic flow sensor |
| CN110398279A (en) * | 2019-08-12 | 2019-11-01 | 杭州源牌环境设备有限公司 | A kind of electromagnetic flowmeter flow rate test tooling caliberating device |
| CN112504365B (en) * | 2020-11-25 | 2022-05-20 | 合肥工业大学 | Magnetic circuit structure optimization design method of electromagnetic flow sensor |
| CN113008336B (en) * | 2021-02-18 | 2022-07-12 | 重庆川仪自动化股份有限公司 | Method for realizing permanent magnet sodium flowmeter cross-correlation method in-situ calibration based on error correction |
| DE102022121564A1 (en) | 2022-08-25 | 2024-03-07 | Endress+Hauser Flowtec Ag | Method for determining a flow velocity-dependent measurement variable |
| DE102022121702A1 (en) | 2022-08-26 | 2024-02-29 | Endress+Hauser Flowtec Ag | Method for determining a correction function |
| CN117451145B (en) * | 2023-10-17 | 2024-05-28 | 上海肯特仪表股份有限公司 | Electromagnetic flowmeter calibration method, system, medium and equipment |
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