CN109186722A - A kind of on-line calibration method and system of the Permanent-Magnet Sodium Flowmeter of embedded swirl generating body - Google Patents
A kind of on-line calibration method and system of the Permanent-Magnet Sodium Flowmeter of embedded swirl generating body Download PDFInfo
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- CN109186722A CN109186722A CN201811353018.4A CN201811353018A CN109186722A CN 109186722 A CN109186722 A CN 109186722A CN 201811353018 A CN201811353018 A CN 201811353018A CN 109186722 A CN109186722 A CN 109186722A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
Abstract
Specific works situation when liquid metal sodium flow, the calibration characteristics relational expression of modified flow rate meter, the step of specifying on-line calibration are measured according to the Permanent-Magnet Sodium Flowmeter of embedded swirl generating body；It proposes the cross-correlation analysis method using Biased estimator, determines that suitable sample frequency and cross-correlation analysis are counted, optimize data processed result, improve the precision of calibration；It proposes to need to have to be larger than transmission time of the fluid between two sets of magnetic systems in view of the period of flowed fluctuation signal as caused by vortex in primary instrument design；NI company model is used to build the on-line calibration system for integrating the functions such as signal condition, data acquisition, display, analysis, printing for the data collecting card of USB-6216.
Description
Technical field
The present invention relates to field of flow detection, be a kind of Permanent-Magnet Sodium Flowmeter to embedded (having) swirl generating body into
The method and system of row on-line calibration.
Background technique
This Permanent-Magnet Sodium Flowmeter for requiring regular on-line calibration is mainly by primary transducer, secondary meter and signal electricity
The composition such as cable, wherein primary instrument is by runner, swirl generating body, first set magnetic system, second set of magnetic system, electrode 1, electrode
2, electrode 3, electrode 4, electrode 5, electrode 6, electrode 7 and electrode 8 form, and structural schematic diagram is as shown in Figure 1.With common magneto
Sodium flowmeter is different in the structure of primary instrument, is mainly reflected in: being mounted with semi-moon shaped vortex at runner beginning
Generating body, for generating fluid whirl；After swirl generating body, the special magnet steel made of alnico, symmetrically
Former and later two positions of runner are distributed in, stable magnetic field is generated in runner；In the surface that runner is covered by field region and
There is a pair of electrodes in underface: electrode 3 and electrode 4, picks up the induction electric generated by the Liquid Sodium flow cutting magnetic field in pipeline
Gesture signal E；There is a pair of electrode for being parallel to magnet steel: electrode 1 and electrode 2 in the left and right sides of magnet steel in front, for picking up by flowing
Flowed fluctuation signal caused by body vortex.The above-mentioned magnet steel being previously mentioned and two pairs of electrodes are known as the permanent magnetism of embedded swirl generating body
The first set magnetic system of formula sodium flowmeter；After first set magnetic system, second set of magnetic system is installed in the position of distance L.Second
It is identical with first set magnetic system to cover magnetic system.
The working principle of the Permanent-Magnet Sodium Flowmeter of embedded swirl generating body is: when the flowmeter works normally, Liquid Sodium
The magnetic line of force of fluid cutting magnetic field generates induced electromotive force E and is calculated and works as according to the calibration characteristics relational expression of E and flowmeter
Preceding sodium flow；When needing to carry out on-line calibration, cross-correlation point is carried out to the collected two-way flowed fluctuation signal of two sets of magnetic systems
Analysis, the corresponding abscissa of the peak point of cross-correlation analysis result are transmission time (delay of the fluid between two sets of magnetic systems
Time) τ, according to the relational expression of Q (volume flow) obtained by calibrating and τ, (relational expression of Q and τ need to make in the flowmeter
With before, in advance the flowmeter is demarcated to obtain using method of standard table or other scaling methods, and save.The relational expression
It is permanently effective not by such environmental effects), available current sodium flow, and according to induced electricity collected in magnetic system
Electromotive force signal E establishes the calibration characteristics relational expression of new Q and E, to achieve the purpose that on-line calibration.
Permanent-Magnet Sodium Flowmeter needs the reason of on-line calibration to be: coolant of the Liquid Sodium as nuclear reactor needs to adopt
It is accurately measured with Permanent-Magnet Sodium Flowmeter, to guarantee the normal operation of nuclear reactor.Some Permanent-Magnet Sodium Flowmeters
Due to for a long time in nuclear reactor, by irradiate, the environment such as high temperature are influenced, cause the magnetic flux density of its magnet steel to decline, to change
Become calibration characteristics, causes flow measurement inaccurate.But Permanent-Magnet Sodium Flowmeter has been mounted in heap at this time, and sodium
Running environment requirement is totally-enclosed, therefore, it is impossible to carry out off-line calibration to it, it is necessary to carry out on-line calibration.For this purpose, devising embedded
The Permanent-Magnet Sodium Flowmeter of swirl generating body.
Domestic Liu Yun flame, Chen Daolong et al. devise a set of related sodium flowmetering system (Liu based on Labview software
Yun Yan, Chen Daolong, poplar build big and design [J] atomic energy science and technology based on the correlation measurement sodium flow system of Labview,
2015,49 (10): 1865-1869.), to meet the needs of China Experiment Fast Reactor primary Ioops main pump bypass sodium flow meter calibrating.It should
Paper mainly passes through emulation experiment, it is thus identified that the feasibility of cross-correlation method, and analyze systematic error.But the paper institute
The system stated has the following problems: (1) measurement accuracy of system is to be improved；(2) key of cross-correlation analysis method is not provided
Technical detail.
Chinese utility model patent discloses a kind of permanent-magnet electromagnetic flowmeter on-line proving device (Cheng Haisu, space mono-
Kind permanent-magnet electromagnetic flowmeter on-line proving device, utility model patent number: 201621387744.4, the applying date:
2016.12.17.), intend carrying out on-line proving to permanent-magnet electromagnetic flowmeter.This on-line proving device mainly includes power supply electricity
Road, the first signal conditioning circuit, second signal conditioning circuit, the first A/D (analog/digital) sample circuit, the 2nd A/D sample circuit,
Data processing circuit and imput output circuit.The device is by being improved and being sampled to two-way flowed fluctuation signal, later
The data processing circuit with DSP (digital signal processor) for core is utilized, cross-correlation analysis method is based on, calculates two-way flow
The delay time of fluctuation signal to extrapolate the actual flow velocity of fluid, and extrapolates new calibration coefficient accordingly, completes permanent magnetism
The on-line calibration of formula electromagnetic flowmeter.The utility model patent has many advantages, such as compact, easy to use and cheap.
But the utility model patent has the disadvantage that (1) permanent-magnet electromagnetic flowmeter when measuring Liquid Sodium flow, indexing is special
The foundation of sexual intercourse formula needs to consider temperature change, and specific relational expression is not provided in the patent.(2) in the patent only
Mentioning on-line proving is based on cross-correlation analysis method, it is not specified that carries out key technology details when cross-correlation analysis.(3) do not have
There are the specific steps for clearly proposing on-line calibration.(4) using DSP as the core of data processing, not only the sample frequency meeting of system
It is restricted, and cannot achieve increasingly complex algorithm, the design of human-computer interaction interface is also relatively simple, and user experience is complete
It can not be compared with computer processing system.
Summary of the invention
The invention solves key technology problems present in existing system, provide one kind and are capable of on-line calibration
The method and system of the Permanent-Magnet Sodium Flowmeter of embedded swirl generating body.
The technical solution of the invention patent is as follows:
Ordinary electromagnetic flowmeter calibration characteristics relational expression may be expressed as:
In formula, Q is volume flow, and E is the induced electromotive force that conductive liquid fluid generates；B is the magnetic flux on cross section of fluid channel
Metric density (magnetic induction intensity)；D is the interior diameter of flowtube (measurement pipe or runner)；For the flow velocity of conductive liquid fluid.And
Permanent-Magnet Sodium Flowmeter needs to consider influence of the fluid temperature (F.T.) to calibration characteristics relational expression when measuring Liquid Sodium flow, therefore,
Revised calibration characteristics relational expression Q~E~TfIt may be expressed as:
Q=KE=f (Tf) E=(ATf 2+BTf+C)E (2)
In formula, TfFor the temperature of Liquid Sodium, A, B and C are coefficient.According to correlation measurement flow principle, cross-correlation is utilized
Analysis method calculates the delay time T between two-way flowed fluctuation signal, as transmission time of the fluid in distance L, in turn
Flow Q can be obtained are as follows:
When the influence for considering Liquid Sodium temperature Tf, relational expression Q~τ~T is obtainedfAre as follows:
In formula, a, b and c are coefficient.
Present system mainly includes that signal condition and output module, NI data collecting card, master system and laser are beaten
Print machine.(1) signal condition and output module include signal conditioning circuit 1, signal conditioning circuit 2 and 4~20mA output circuit.
(2) NI (National Instruments) data collecting card uses NI company model for the data collecting card of USB-6216.The acquisition
16 tunnel simulation input of Ka You, 2 tunnel simulation outputs, single channel maximum sample frequency can achieve 400kHz, and multichannel is adopted when inputting
Use asynchronous-sampling.(3) master system can be developed in PC machine or laptop using Labview software.Core
Center algorithm cross-correlation analysis uses Biased estimator mode, can greatly improve the interference free performance of algorithm, obtain more accurate
Calculated result；Sample frequency is set as 10kHz, and cross-correlation points are set as at 32768 points, both can satisfy the required precision of calibration,
Guarantee that system possesses faster response speed simultaneously；In order to guarantee the accuracy of calibration result, calibrated 3 times under same operating；
In each calibration process, multiple cross-correlation calculation will be carried out, after removing maximum, minimum value, takes its mean value as each
The final result of calibration.
The step of on-line calibration, is:
(1) first calibration；Currently given sodium volume flow Q, and root are measured with method of standard table or other scaling methods
According to the sodium temperature T currently measuredf, the obtained transmission time τ of induced electromotive force signal E and cross-correlation analysis, establish Q~E~T respectivelyf
With Q~τ~TfRelational expression, and save.
(2) normal use；The Liquid Sodium temperature T obtained according to actual measurementf, induced electromotive force signal E and calibrate for the first time
The calibration characteristics relational expression Q~E~T arrivedf, the sodium flow Q in pipeline is calculated, realizes flow measurement.
(3) periodic calibration；Embedded swirl generating body Permanent-Magnet Sodium Flowmeter after a period of use, calibration characteristics closes
It is formula Q~E~TfIt changes, still, Q~τ~TfRelational expression remain unchanged.When the transmission obtained according to cross-correlation analysis
Between τ, the Liquid Sodium temperature T that measuresfAnd obtained relational expression Q~τ~T is calibrated for the first timef, present flow rate value Q can be calculated；Again
According to the induced electromotive force signal E measured at this time, new Q~E~T is establishedfRelational expression, to complete embedded swirl generating body
The on-line calibration of Permanent-Magnet Sodium Flowmeter calibration characteristics works.
The invention has the advantages that tool when measuring Liquid Sodium flow according to the Permanent-Magnet Sodium Flowmeter of embedded swirl generating body
Body running situation, has modified the calibration characteristics relational expression of the Permanent-Magnet Sodium Flowmeter of embedded swirl generating body, and specifies online
The step of calibration；The cross-correlation analysis method using Biased estimator is proposed, determines suitable sample frequency and cross-correlation analysis
Points, optimize data processed result, improve the precision of calibration；NI company model is used to adopt for the data of USB-6216
Truck, host computer (personal computer or laptop), homemade signal condition and output module and laser printer
Composition integrates the on-line calibration system of the functions such as signal condition, data acquisition, display, analysis, printing.
Detailed description of the invention
Fig. 1 is the primary instrument structural schematic diagram of the Permanent-Magnet Sodium Flowmeter of embedded swirl generating body.
Fig. 2 is the schematic diagram of cross-correlation analysis method.
Fig. 3 is the hardware block diagram of on-line calibration system.
Fig. 4 is the software architecture diagram of on-line calibration system.
Fig. 5 is the main program flow chart of upper computer software in on-line calibration system.
Fig. 6 is host computer main interface.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing.
Design philosophy of the invention is: the Permanent-Magnet Sodium Flowmeter of embedded swirl generating body uses one section in nuclear reactor
After time, due to by irradiate, thermal cycle, the time passage etc. influenced, cause the magnetic flux density of magnet steel to be declined, to change
Become calibration characteristics, causes flow measurement inaccurate, and the requirement of the running environment of sodium flow is totally-enclosed, can not use off-line calibration
Method, therefore, using cross-correlation analysis method measurement sodium flow feature not affected by environment, to Permanent-Magnet Sodium Flowmeter into
Row on-line calibration.
The primary instrument structure of the Permanent-Magnet Sodium Flowmeter of embedded swirl generating body is as shown in Figure 1.Primary instrument by runner,
Swirl generating body, first set magnetic system, second set of magnetic system, electrode 1, electrode 2, electrode 3, electrode 4, electrode 5, electrode 6, electrode
7 and electrode 8 form.
Cross-correlation analysis method schematic diagram is as shown in Figure 2.Fig. 2 (a) is that two-way has certain phase difference (time difference), phase
As the vortex signal output signals of vortex flow sensors (similar), be a kind of local peaking's point and the lesser standard of mechanical periodicity
Periodic signal, by Fig. 2 (a) it is found that signal y (t) anticipating signal x (t) 0.1s.Fig. 2 (b) is to carry out Biased estimator to two paths of signals
Cross-correlation analysis result, it can be seen that the corresponding abscissa of cross-correlation analysis result peak value is 0.1s, with actual conditions one
It causes.Fig. 2 (c) be to two paths of signals carry out unbiased esti-mator cross-correlation analysis as a result, discovery cross-correlation analysis result not only have it is more
A very close peak point, moreover, corresponding cross-correlation analysis result is even more than at abscissa 1.66s and 1.784s
The corresponding cross-correlation analysis of abscissa 0.1s is as a result, this results in being unable to get correct delay time by finding peak point.
Assuming that two signal sequences for carrying out cross-correlation analysis are respectively xa (n) and xb (n), the then calculating of its Biased estimator and unbiased esti-mator
Formula is respectively formula (5) and formula (6).
Formula (5) and formula (6) show with | m | increase, the data volume that the multiplication in cross-correlation analysis is added gradually subtracts
It is few.In Biased estimator, denominator N is remained unchanged；In unbiased esti-mator, denominator N- | m | also synchronously reducing.Therefore, mutual
In the Biased estimator of correlation analysis, with | m | increase, can decay to the amplitude of cross-correlation analysis result, and | m | more
Greatly, decay bigger；In unbiased esti-mator, it will not decay to the amplitude of cross-correlation analysis result.
In practical applications, the two-way flowed fluctuation of the Permanent-Magnet Sodium Flowmeter primary instrument output of swirl generating body is embedded
Signal is close to (being approximately) quasi-periodic signal, if carrying out unbiased esti-mator to it, cross correlation results will appear multiple amplitudes
Similar peak value leads to not lead to if the output signal of the primary instrument, by noise jamming, peak value just will appear fluctuation
It crosses detection peak value and finds correct delay time, as shown in Fig. 2 (c).But in practical application it is difficult to ensure that primary instrument it is defeated
Signal is not by noise jamming out, and therefore, the anti-interference ability of unbiased esti-mator is very poor.Biased estimator has very strong anti-interference ability.
But when in use, it is necessary to assure the period tau of the output signal of primary instrument0Greater than delay time T calculated, could obtain
To correct calculated result, by Fig. 1 (b), (c) it is found that in cross-correlation analysis result, the distance between two peak points are
τ0.If τ0Less than τ, then the corresponding cross correlation results of real delay time T have been attenuated, thus can not be by finding peak value
The method of point, determines correct delay time.Therefore, in primary instrument in design, it is necessary to consider that as caused by vortex
When the period (referring here to the temporal period) of flowed fluctuation signal has to be larger than transmission of the fluid between two sets of magnetic systems
Between (delay time).
The hardware block diagram of present system is as shown in figure 3, mainly include signal condition and output module, the acquisition of NI data
Card, master system and laser printer.Seven tunnel input signals include compensation temperature signal, Liquid Sodium temperature signal Tf, the temperature of magnet steel 1
Spend signal, 2 temperature signal of magnet steel, induced electromotive force signal E, flowed fluctuation signal 1 and flowed fluctuation signal 2.
(1) signal condition and output module include signal conditioning circuit 1, signal conditioning circuit 2 and 4~20mA output electricity
Road.Signal conditioning circuit 1 is to compensation temperature signal, Liquid Sodium temperature signal Tf, 1 temperature signal of magnet steel and 2 temperature signal of magnet steel into
Row amplification, filtering and impedance matching；Signal conditioning circuit 2 is to induced electromotive force signal E, flowed fluctuation signal 1 and flowed fluctuation
Signal 2 carries out pretreatment appropriate；4~20mA output circuit connects the simulation output end of data collecting card, output all the way 4~
20mA direct current signal characterizes present flow rate value.
(2) NI data collecting card uses NI company model for the data collecting card of USB-6216.In part of data acquisition, adopt
Sample frequency is set as 10kHz, can acquire seven tunnel input signals simultaneously, and input mode can be set as difference or single-ended；D/A (number/
Mould) converter code value that master system is calculated is converted, and then drives 4~20mA output circuit.
(3) master system can be PC machine or laptop, in master system using Labview software into
Row data processing and 4~20mA code value calculate.In data processing section, all input signals are acquired and shown in real time, count in real time
It calculates and shows the delay time T that cross-correlation analysis obtains, present flow rate Q is calculated and be shown in real time, display calibration after the completion of calibration
Gained Q~E~TfWith Q~τ~TfRelational expression, and generate Calibration Report.In the calculating of 4~20mA code value, one is calculated in real time
It characterizes the current value of present flow rate and is converted into voltage, exported later by the simulation output end of NI data collecting card.Wherein, mutually
It closes analysis and uses Biased estimator mode, the interference free performance of algorithm can be greatlyd improve, obtain more accurate calculated result；
Cross-correlation points are set as at 32768 points, both can satisfy the required precision of calibration, while guaranteeing that system possesses faster response speed
Degree；In order to guarantee the accuracy of calibration result, calibrated 3 times under same operating；In each calibration process, it will carry out repeatedly
Then cross-correlation calculation removes maximum, minimum value, then take its mean value as the final result calibrated every time.
The groundwork process of present system are as follows: Liquid Sodium flow flows through primary instrument, passes through electrode 3 and electrode 40
Induced electromotive force signal E is got, is picked up by electrode 1 and electrode 2 and arrives flowed fluctuation signal 1, picked up by electrode 5 and electrode 6
To flowed fluctuation signal 2, compensation temperature signal is acquired by Pt100 thermal resistance temperature surveying channel, passes through three tunnel K-type thermocouples
Temperature measuring channel acquires Liquid Sodium temperature signal Tf, 2 temperature signal of 1 temperature signal of magnet steel and magnet steel；By two signal condition electricity
Road respectively amplifies it, filters and impedance matching；The analog input end of signal input data capture card after conditioning
It is acquired, is then sent to master system, cross-correlation analysis and flowmeter calibration characteristics curve are completed by upper computer software
Fitting, realizes the on-line calibration of flowmeter, and is saved, printed and network interface transfers to the result of calibration；Meanwhile it passing through
The D/A converter and 4~20mA output circuit of data collecting card are crossed, 4~20mA direct current signal characterizes currently all the way for output
Flow value.
Present system software architecture diagram is as shown in Figure 4.Systemic software development takes modularized design scheme, by sub- journey
Sequence composition function module, by master monitor unified call.Software function module include master monitor, parameter setting module,
Data acquisition module, cross-correlation analysis module, flow rate calculation module, Q~τ curve fitting module, Q~E curve fitting module, number
According to display module, data memory module, self calibration module, inspection module, Calibration Report generation module and communication module.
Master monitor is the total activation program of entire software, calls each functional module.Parameter setting module is complete in program
It is called at first after initialization, the parameters such as model selection, instrument bore, sample frequency, cross-correlation points are set
It sets.Data acquisition module carries out data acquisition according to parameters such as the sample rates set after calibration starts, and judges to incude
Electromotive force signal E and Liquid Sodium temperature TfIt is still collected by capture card from being manually entered.Cross-correlation analysis module is to adopting
The flowed fluctuation signal 1 and flowed fluctuation signal 2 collected carries out cross-correlation analysis, and transmission time τ is calculated.Flow rate calculation mould
Block calibrates according to transmission time τ and for the first time obtained Q~τ~T under the mode of periodic calibrationfThe volume of relational expression calculating sodium
Flow Q.When first calibration, Q~τ curve fitting module is according to the sodium volume flow Q being manually entered, and the induction collected
Electromotive force signal E and Liquid Sodium temperature Tf, calculate Q~τ~TfRelational expression；Q~E curve fitting module is according to the sodium volume flow of input
Measure Q and induced electromotive force signal E and Liquid Sodium temperature Tf, calculate Q~E~TfRelational expression.When periodic calibration, Q~E curve matching
The sodium volume flow Q and collected induced electromotive force signal E and Liquid Sodium that module is calculated according to flow rate calculation module
Warm Tf, recalculate calibration characteristics curve Q~E~T of sodium electromagnetic flowmeterf.Data memory module is used to store in calibration process
Significant data, the original signal such as inputted by capture card, the transmission time that repeatedly cross-correlation analysis obtains in calibration process,
Q~τ obtained by calibrating~TfRelational expression, Q~E~TfRelational expression and Calibration Report etc..Data disaply moudle with figure, table or
The form of person's relational expression show important parameter in calibration process and as a result, as collected signal filtering front and back real-time waveform,
Repeatedly flow, the temperature value etc. in calibration.Self calibration module be used to calibrate all temperature and electrode input signal and 4~
20mA output signal.Whether inspection module is ideal to verify calibration result by calculating error and repeatability.Calibration Report generates
Module automatically generates this Calibration Report after demarcating or having inspected, and mainly includes front in calibration process in Calibration Report
Content in plate data record table, and calibrate the formula and curve graph of two obtained relational expressions.Communication module completes number
According to the communication between the equipment such as processing system and data collecting card and laser printer.
The upper computer software main program flow chart of present system is as shown in Figure 5.The basic procedure of software operation are as follows: first
Multiple display controls of front panel, button etc. are initialized；It needs to click parameter set button later, pops up parameter setting
Sub-interface carries out the setting of parameters.After parameter setting is completed, beginning or checkout button are clicked, software starts to carry out
Data acquisition, and to collected data real-time perfoming cross-correlation analysis；Meanwhile according to cross-correlation analysis as a result, real-time defeated
4~20mA electric current out.According to mode selection case and whether examine later and carry out different operations, obtains the value of flow Q: first
First judgment model selection is first calibration or periodic calibration.If first calibration, and do not test, Q value is to pass through hand
Dynamic input, without calculating；If periodic check, then basis calibrates obtained Q~E~T for the first timefRelational expression finds out Q value；If mode
Selection is periodic calibration, judges whether to examine, and if not inspection, then basis calibrates obtained Q~τ~T for the first timefRelationship
Formula finds out Q value；If tested, need respectively according to Q~E~TfRelational expression and Q~τ~TfRelational expression finds out two Q
Value is prepared for subsequent calculating calibration error.Then, initial data and every intermediate result are stored, and on main boundary
Face is shown.In order to guarantee the accuracy of result, calibrated three times under each operating condition.The process is automatically performed by software.Same work
After being calibrated three times under condition, calculate outflow and transmission time etc. average value and repeatability (if checkout button is pressed,
Need to calculate the error of flow)；So far the calibration under an operating condition is completed.Then, change flow value or temperature value repeats
State process.Finally, carrying out least square fitting to the result repeatedly calibrated, Q~E~T is obtainedfRelational expression and Q~τ~TfRelationship
Curve and relational expression are stored, shown and are generated Calibration Report, complete on-line calibration by formula and respective curve.
Wherein, the main distinction of first calibration and periodic calibration is: when first calibration, flow Q value is manually entered, by marking
Quasi- table or other scaling method measurements obtain；And when periodic calibration, flow Q value is according to existing Q~τ~TfRelational expression calculates
It obtains.
When inspection, in order to verify the i.e. Q~E of newly-established sodium flowmeter calibration characteristics~TfWhether relational expression, which meets precision, is wanted
It asks, needs the error by calculating flow and repeatability to examine the result of calibration.Under initial calibration mode, standard scale or
The flow that other scaling methods are surveyed is by being manually entered, as normal flow；And periodically under calibration mode, it will be by Q~τ~Tf
The flow value that relational expression is calculated is as normal flow.
The host computer main interface of present system is as shown in Figure 6.Interface is successively graphical display, relevant parameter from top to bottom
Input and calculated result shows, fit correlation formula and function button part.In Fig. 6, include in the tabs control in left side
There are two waveform chart controls to show the collected signal of capture card, and the signal after software filtering respectively, and each
Control can at most show 7 curves simultaneously；It include 6 tabss in the tabs control of right side, first 5 are that figure is aobvious
Show, last 1 " data record " tabs is a table, and intermediate result when for logging program operation has: flow respectively
Q and its average value, transmission time τ and its average value, induced electromotive force E and its average value, temperature TfAnd its average value, repeatability
And error.The amount that can be manually entered has: first calibrated fluxes value Q (can only be manually entered in first calibration process, determine
Phase calibrate when the input control it is unavailable), input induced electromotive force E, input temp Tf.Calculated result shows calibration progress, every
Average transmission time and output electric current under a operating condition.Bottom is five function buttons, is parameter setting respectively, starts, stops
Only, inspection and self calibration.
Claims (5)
1. the on-line calibration method and system of the Permanent-Magnet Sodium Flowmeter of embedded swirl generating body, including signal condition and output mould
Block, NI data collecting card, master system and laser printer, it is characterised in that:
(1) signal condition and output module include signal conditioning circuit 1, signal conditioning circuit 2 and 4~20mA output circuit；Letter
Number conditioning circuit 1 is to compensation temperature signal, Liquid Sodium temperature signal Tf, 1 temperature signal of magnet steel and 2 temperature signal of magnet steel put
Greatly, filtering and impedance matching；Signal conditioning circuit 2 is to induced electromotive force signal E, flowed fluctuation signal 1 and flowed fluctuation signal 2
Carry out pretreatment appropriate；4~20mA output circuit connects the simulation output end of data collecting card, and 4~20mA is straight all the way for output
Signal is flowed, present flow rate value is characterized；
(2) NI data collecting card uses NI company model for the data collecting card of USB-6216；Part of data acquisition, sample frequency
It is set as 10kHz, seven tunnel input signals can be acquired simultaneously, input mode can be set as difference or single-ended；D/A (D/A) conversion
The code value that master system is calculated device is converted, and then drives 4~20mA output circuit；
(3) master system can be PC machine or laptop, be counted in master system using Labview software
It is calculated according to processing and 4~20mA code value.In data processing section, all input signals are acquired and shown in real time, calculate in real time simultaneously
Present flow rate Q is calculated and be shown in the delay time T that display cross-correlation analysis obtains in real time, display calibration gained Q after the completion of calibration
~E~TfWith Q~τ~TfRelational expression, and generate Calibration Report.In the calculating of 4~20mA code value, a characterization is calculated in real time
The current value of present flow rate is simultaneously converted into voltage, is exported later by the simulation output end of NI data collecting card.Wherein, cross-correlation point
Analysis uses Biased estimator mode, can greatly improve the interference free performance of algorithm, obtain more accurate calculated result；Mutually
It closes points and is set as at 32768 points, both can satisfy the required precision of calibration, while guaranteeing that system possesses faster response speed；For
The accuracy for guaranteeing calibration result, is calibrated 3 times under same operating；In each calibration process, it will carry out repeatedly mutually
It closes and calculates, then, remove maximum, minimum value, then take its mean value as the final result calibrated every time.
2. the on-line calibration method and system of the Permanent-Magnet Sodium Flowmeter of embedded swirl generating body as described in claim 1,
It is characterized in that:
Permanent-Magnet Sodium Flowmeter needs to consider influence of the fluid temperature (F.T.) to calibration characteristics relational expression when measuring Liquid Sodium flow,
Revised calibration characteristics relational expression Q~E~TfIt may be expressed as:
Q=KE=f (Tf) E=(ATf 2+BTf+C)E (2)
In formula, TfFor the temperature of Liquid Sodium, A, B and C are coefficient；According to correlation measurement flow principle, cross-correlation analysis side is utilized
Method calculates the delay time T between two-way flowed fluctuation signal, as transmission time of the fluid in distance L, and then available
Flow Q are as follows:
As consideration Liquid Sodium temperature TfInfluence, obtain relational expression Q~τ~TfAre as follows:
In formula, a, b and c are coefficient.
3. the on-line calibration method and system of the Permanent-Magnet Sodium Flowmeter of embedded swirl generating body as described in claim 1,
It is characterized in that:
The step of on-line calibration, is:
(1) first calibration；Measure currently given sodium volume flow Q with method of standard table or other scaling methods, and according to working as
Before the sodium temperature T that measuresf, the obtained transmission time τ of induced electromotive force signal E and cross-correlation analysis, establish Q~E~T respectivelyfAnd Q
~τ~TfRelational expression, and save；
(2) normal use；The Liquid Sodium temperature T obtained according to actual measurementf, induced electromotive force signal E and obtained by calibrating point first
Spend characteristic relation Q~E~Tf, the sodium flow Q in pipeline is calculated, realizes flow measurement；
(3) periodic calibration；Permanent-Magnet Sodium Flowmeter after a period of use, calibration characteristics relational expression Q~E~TfIt changes,
But Q~τ~TfRelational expression remain unchanged；The transmission time τ obtained according to cross-correlation analysis, the Liquid Sodium temperature T measuredfWith
And first relational expression Q~τ~T obtained by calibratingfPresent flow rate value Q can be calculated；Further according to the induction electric measured at this time
Gesture signal E, establishes new Q~E~TfRelational expression, to complete the on-line calibration work of flowmeter calibration characteristics.
4. the on-line calibration method and system of the Permanent-Magnet Sodium Flowmeter of embedded swirl generating body as described in claim 1,
It is characterized in that:
Using the cross-correlation method of Biased estimator, determines and suitably counted using frequency and cross-correlation, make data processed result most
Optimization, improves the precision of calibration；
In practical applications, the two-way flowed fluctuation signal of the Permanent-Magnet Sodium Flowmeter primary instrument output of swirl generating body is embedded
Close to quasi-periodic signal；If carrying out unbiased esti-mator to it, cross correlation results will appear peak value similar in multiple amplitudes；If
The output signal of the primary instrument is by noise jamming, then peak value just will appear fluctuation, leads to not look for by detecting peak value
To correct delay time；Biased estimator has very strong anti-interference ability, still, when in use, it is necessary to assure primary instrument
The period tau of output signal0Greater than delay time T calculated, correct calculated result can be just obtained；Therefore, primary instrument exists
When design, it is necessary to consider that the period of flowed fluctuation signal as caused by vortex has to be larger than fluid between two sets of magnetic systems
Transmission time；
Sample frequency is set as 10kHz, and cross-correlation points are set as at 32768 points, both can satisfy the required precision of calibration, guaranteed simultaneously
System possesses faster response speed.
5. the on-line calibration method and system of the Permanent-Magnet Sodium Flowmeter of embedded swirl generating body as described in claim 1,
It is characterized in that:
Use NI company model for the data collecting card of USB-6216 built collection signal condition, data acquisition, display, analysis,
The functions such as printing are in the on-line calibration system of one.
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