CN107655552B - A kind of Ultrasonic water meter flow velocity modification method for propagating the time difference and drift error based on non-measured section - Google Patents
A kind of Ultrasonic water meter flow velocity modification method for propagating the time difference and drift error based on non-measured section Download PDFInfo
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- CN107655552B CN107655552B CN201711118256.2A CN201711118256A CN107655552B CN 107655552 B CN107655552 B CN 107655552B CN 201711118256 A CN201711118256 A CN 201711118256A CN 107655552 B CN107655552 B CN 107655552B
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups
- G01P21/02—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers
- G01P21/025—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers for measuring speed of fluids; for measuring speed of bodies relative to fluids
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Abstract
A kind of Ultrasonic water meter flow velocity modification method for propagating the time difference and drift error based on non-measured section, it the following steps are included: suitable under precise measurement reference temperature, the adverse current time and, it is average by multiple repairing weld, calculate non-measured section time and；According to the time difference that reference temperature, minimum temperature, maximum temperature repeatedly measure, reference drift and calibration drift are calculated；Maskable non-measured time when real flow measurement, calibration measurement section time difference value remove actual temperature drift, carry out temperature inverse, Reynolds number compensation.The present invention passes through hydrostatic meter under single point temperature and calculates measuring section effective time difference and non-measured section of error, error caused by solving the processing of base table and energy converter and assembling；By establishing drift and temperature curve, drift value is effectively removed, error caused by timing chip resolution deficiency is reduced, temperature-compensating correction is carried out by real flow measurement inverse temperature, factory carries out an accurate calibration, and Measurement Algorithm is simple when actual measurement, and the accuracy of measuring is high.
Description
Technical field
It is specifically a kind of to be missed based on the non-measured section of propagation time difference and drift the invention belongs to water meter measurement detection technique field
The Ultrasonic water meter flow velocity modification method of difference.
Background technique
Currently, non-linear, the processing that influence the wired mean flow rate of factor and face mean flow rate of ultrasonic water Watch Error fill
It is influenced with error, non-measured section of error, inner wall of the pipe roughness, error, TDC timing resolution caused by temperature change under normal pressure
Error caused by deficiency, timing terminate caused by the error of the unstable generation of echo, fluids within pipes interference, characteristic correction accidentally
Vibration and mounting condition are unsatisfactory for bring error in difference, pipe.
Fractional error factor can pass through piecewise linear correction or fitting a straight line correction, increase timing resolution, design filtering
Circuit obtains more reliable stop wave, increases rectifying component, front and back increase straight pipe, increases temperature sensor or using accurate temperature
The means such as inverse compensate correlated error；Drift, the non-measured section of error introduced mostly use external detection device or correction coefficient
Amendment force repair, do not refer to preferably solution.
Way general at present is the machining accuracy that pipeline sound path L depends on pipeline section producer, the ultrasonic wave warp of actual measurement
The sound path crossed contains the centre distance of the centre distance of two reflectings surface, 2 times of energy converter to reflecting surface.Since energy converter is installed
And the actual waveform reflection position difference of own dimensions error, pipeline interior reflective surface causes rigging error.And temperature change passes through
Using the way of external temperature sensor, or by using more advanced timing chip (being internally integrated temperature measuring unit) in practical survey
The way that inverse temperature and the difference of observed temperature compensate when amount, thus brings hardware cost to increase；TDC timing chip point
Error, that is, drift that resolution itself generates usually individually tests drift by outward element, do not change original base table structure and
Not without preferably solution under the premise of external equipment.
Summary of the invention
The present invention does not change existing base table structure in view of the shortcomings of the prior art, providing one kind, does not increase cost, external nothing
Subsidiary equipment accurately calculates actual measurement sound path by algorithm, establishes drift and temperature variation curve, using sectional calibration
Method realize family Ultrasonic water meter accurate measurement.
The technical scheme is that
The present invention provides a kind of Ultrasonic water meter flow velocity modification method that the time difference and drift error are propagated based on non-measured section, should
Method the following steps are included: S1, calculate non-measured section of propagation time the step of；S2, drift error and temperature curve are established
The step of；S3, instantaneous line flow velocity is calculated.
Further, step S1 specifically:
Step S1-1, checking table sends calibration command and reference temperature T to Ultrasonic water meterr；
Step S1-2, using Ultrasonic water meter carry out multiple repairing weld its in reference temperature TrSuitable, the adverse current of lower zero delivery are propagated
The sum of time obtains the average value SumTof of multiple repairing weldTr；
Step S1-3, non-measured section of propagation time E is calculated using following formulaS:
ES=SumTofr-2×(L0+Ld)/Cr
Wherein: TrIndicate reference temperature, SumTofrIt is ultrasonic wave in reference temperature TrThe zero delivery repeatedly measured down it is suitable,
The average value in the sum of adverse current propagation time, L0Indicate effectively measurement length of tube, LdIndicate effectively measurement pipe diameter, CrIndicate reference
Temperature TrUnder supersonic speed, acquisition of tabling look-up.
Further, step S2 the following steps are included:
Step S2-1, according to reference temperature TrTemperature range (T is measured with Ultrasonic water meteri, Tj), delimit temperature range Ti< Tr
≤Tj；
Step S2-2, three temperature spot T are obtainedi, Tr, TjThe measurement drift value of zero delivery
Step S2-3, reference temperature T is calculatedrReference drift value
Wherein: K (Tj,Ti) indicate temperature value and the corresponding slope for measuring drift value；
Step S2-4, under water meter operating condition, observed temperature T is obtainedmMeasurement drift value
Step S2-5, observed temperature T is calculatedmReference drift value
Step S2-6, drift error is establishedWith water meter operating condition observed temperature TmRelation curve:
Wherein: TmIndicate actual measurement temperature when Ultrasonic water meter works normally；Indicate temperature TmWhen reference drift
Value；Indicate temperature TmWhen measurement drift value.
Further, in step S2-2 and step S2-4, drift value is measuredCalculating step are as follows: it is right
Ying Yusan temperature spot repeatedly measures suitable, the adverse current time difference value of zero delivery under corresponding temperature point respectively, calculates separately corresponding temperature
The measurement drift value of point
Wherein, NχRespectively indicate the pendulous frequency under corresponding temperature, Δ tχCorresponding measurement temperature spot is respectively indicated in kth time
Suitable, the adverse current time difference value of zero delivery when measurement, Δ tχavgWhen respectively indicating the suitable of zero delivery, the adverse current of corresponding measurement temperature spot
The average value of difference.(discreteness of measurement point can be explained in standard deviation, while ceasing manner of breathing with the timing resolution of timing chip itself
It closes, therefore takes standard deviation as drift standard).
Further, step S3 is specifically included:
Step S3-1, Ultrasonic water meter works normally, and calculates supersonic speed CT；
Wherein: L0Indicate effectively measurement length of tube, LdIndicate effectively measurement pipe diameter, (L0+Ld) indicate effective measurement sound
Journey, SumTofTIt is ultrasonic wave in the sum of suitable, adverse current propagation time, SumTof at temperature T in actual workT=tup+tdwon,
tup、tdwonRespectively indicate suitable, the adverse current propagation time；ESIndicate non-measured section of propagation time；
Step S3-2, according to supersonic speed CTIt tables look-up and obtains actual temperature T；(velocity of sound and temperature relation table)
Step S3-3, instantaneous line flow velocity V is calculatedL；
Wherein, K (Ld,LD) indicate effectively measurement pipe diameter LdWith hose nozzle diameter diameter LDUndergauge coefficient, KΔTIndicate practical
The temperature compensation coefficient of temperature T, CTIndicate supersonic speed, Δ t indicates ultrasonic wave in the suitable, adverse current at temperature T in actual work
The difference in propagation time, EOm(Adapt)Indicate drift error.
Further, further include step S4 after step S3: traffic alignment is carried out by Stepwise calibration.
Beneficial effects of the present invention:
The present invention only needs under a steady temperature under the premise of not changing base table structure and not increasing subsidiary equipment
Precise measurement obtains non-measured section of error, and the precision of measuring section is improved in real flow measurement, and reduction causes due to processing, assembling
Non-measured section of error, effectively correct process and assemble error；Three temperature spot lower time differences and standard deviation are measured, reference zero is calculated
Drift, establishes drift and temperature curve, and using the discreteness of standard deviation detection TDC timing chip measurement, dynamic measuring drift is with temperature
The variation characteristic of degree reduces timing chip resolution deficiency bring error.
The invention proposes a kind of method for removing non-measured time, drift, subject to the metering more for making effective measuring section
Really, by the primary calibration that dispatches from the factory, inverse temperature carries out Reynolds number compensation when actual measurement, and calculates the effectively measurement time difference, makes
With segmentation revised law corrected flow rate, accuracy of water meter is greatly improved.
Although the present invention is illustrated referring to attached drawing, for those skilled in the art, the present invention
There can be various modifications and variations.The equivalent of various changes, variation of the invention is in claims of the present invention content
In covering scope.
The present invention is not directed to technology and is the same as those in the prior art or can be implemented by using the prior art, therefore not in the present invention
It is described in detail.
Other features and advantages of the present invention will then part of the detailed description can be specified.
Detailed description of the invention
Exemplary embodiment of the invention is described in more detail in conjunction with the accompanying drawings, it is of the invention above-mentioned and its
Its purpose, feature and advantage will be apparent, wherein in exemplary embodiment of the invention, identical reference label
Typically represent same parts.
Fig. 1 measurement pipe structure chart.
Fig. 2 drift and temperature profile.
Fig. 3 calibration algorithm flow chart.
Specific embodiment
The preferred embodiment that the present invention will be described in more detail below with reference to accompanying drawings.Although showing the present invention in attached drawing
Preferred embodiment, however, it is to be appreciated that may be realized in various forms the present invention without the embodiment party that should be illustrated here
Formula is limited.
A kind of Ultrasonic water meter flow velocity modification method for propagating the time difference and drift error based on non-measured section, this method include with
Lower step:
S1, the step of non-measured section of propagation time is calculated；
Step S1-1, checking table sends calibration command and reference temperature T to Ultrasonic water meterr；
Step S1-2, sample it in reference temperature T using Ultrasonic water meterrSuitable, the adverse current propagation time of lower zero delivery
The sum of SumTofTr；
Step S1-3, non-measured section of propagation time E is calculated using following formulaS:
ES=SumTofr-2×(L0+Ld)/Cr
Wherein: TrIndicate reference temperature, SumTofrIt is ultrasonic wave in reference temperature TrThe zero delivery repeatedly measured down it is suitable,
The average value in the sum of adverse current propagation time, L0Indicate effectively measurement length of tube, LdIndicate effectively measurement pipe diameter, CrIndicate reference
Temperature TrUnder supersonic speed, acquisition of tabling look-up.
S2, the step of drift error and temperature curve is established；
Step S2-1, according to reference temperature TrTemperature range (T is measured with Ultrasonic water meteri, Tj), delimit temperature range Ti< Tr
≤Tj；
Step S2-2, three temperature spot T are obtainedi, Tr, TjThe measurement drift value of zero delivery
Step S2-3, reference temperature T is calculatedrReference drift value
Wherein: K (Tj,Ti) indicate temperature value and the corresponding slope for measuring drift value；
Step S2-4, under water meter operating condition, observed temperature T is obtainedmMeasurement drift value
Step S2-5, observed temperature T is calculatedmReference drift value
Step S2-6, drift error is establishedWith water meter operating condition observed temperature TmRelation curve:
Wherein: TmIndicate actual measurement temperature when Ultrasonic water meter works normally；Indicate temperature TmWhen reference drift
Value；Indicate temperature TmWhen measurement drift value.
S3, instantaneous line flow velocity is calculated；
Step S3-1, Ultrasonic water meter works normally, and calculates supersonic speed CT；
Wherein: L0Indicate effectively measurement length of tube, LdIndicate effectively measurement pipe diameter, (L0+Ld) indicate effective measurement sound
Journey, SumTofTIt is ultrasonic wave in the sum of suitable, adverse current propagation time, SumTof at temperature T in actual workT=tup+tdwon,
tup、tdwonRespectively indicate suitable, the adverse current propagation time；ESIndicate non-measured section of propagation time；
Step S3-2, according to supersonic speed CTIt tables look-up and obtains actual temperature T；
Step S3-3, instantaneous line flow velocity V is calculatedL；
Wherein, K (Ld,LD) indicate effectively measurement pipe diameter LdWith hose nozzle diameter diameter LDUndergauge coefficient, KΔTIndicate practical
The temperature compensation coefficient of temperature T, CTIndicate supersonic speed, Δ t indicates ultrasonic wave in the suitable, adverse current at temperature T in actual work
The difference in propagation time, EOm(Adapt)Indicate drift error.
When specific implementation:
The present embodiment takes reference temperature T for measuring the copper pipeline section Ultrasonic water meter of DN15r=25 DEG C, have as shown in Figure 1
Effect measurement length of tube L0=0.045m.Effectively measurement pipe diameter Ld=0.011m, base table actual inner diameter LD=0.017m.Two transducings
Device reflecting surface center is away from Lt=0.063m.
Following steps are zero delivery calibration measurement:
1) the sum of the suitable of continuous sampling n times (N >=32) zero delivery, adverse current propagation time SumTofi。
2) n times SumTof is calculatedTrAverage value
3)TrAt=25 DEG C, Cr=1496.6m/s, therefore ES=SumTofavg-2×(L0+Ld)/CrObtain non-measured time
ES。
4) temperature grade T50, Ti=1 DEG C of < Tr≤Tj=50 DEG C, measure TjThe concurrent-countercurrent time difference Δ t of zero deliveryj, TiIt is suitable
Adverse current time difference Δ ti, n times (N >=32) time difference value under three temperature spots is measured, three temperature spot n times time differences is recorded and finds out it and put down
Mean value, according to formulaCalculate TjWhen driftTiWhen driftTherefore reference driftAccording to reference zero
Drift takes actual measurement drift and reference drift difference to calibrate practical drift, therefore the drift curve under actual temperature is
As seen from the above equation, practical drift is the function of temperature and measurement drift, needs to calculate measurement in real flow measurement
Drift, and inverse temperature.
The following are real flow measurements:
5) in practical applications, measurement obtains SumTofT, tup, tdwon, sound path L=L as shown in Figure 10+Ld, can calculate
Supersonic speedBy the velocity of sound with temperature relation table is counter finds actual temperature T.
6) the temperature T according to obtained in step 5 substitutes into drift and temperature curve, according to drift practical in step S2 and temperature
Degree relationship is calibrated, and E is obtainedOm(Adapt), it is illustrated in figure 2 and takes under portion temperature point, actual measurement drift and calibration drift curve
Figure.
7) practical drift substitutes into flow relocity calculation formulaWherein L
Effectively to measure sound path.
8) front flow velocity V is worked as in judgementLIn which flow velocity section, different Calibration equations is called to carry out flow rate correction.
1 portion temperature point of table measures drift and the calibration drift table of comparisons
| Temperature (DEG C) | It measures drift (ns) | It calibrates drift (ns) |
| 0.1 | 0.0266351 | 0.025031107 |
| 1 | 0.038379 | 0.036832983 |
| 5 | 0.031137 | 0.029848652 |
| 10 | 0.0296148 | 0.028648539 |
| 15 | 0.039592 | 0.038947826 |
| 20 | 0.028828 | 0.028505913 |
| 25 | 0.0292474 | 0.0292474 |
| 30 | 0.052954 | 0.053276087 |
| 35 | 0.029888 | 0.030532173 |
| 40 | 0.0275011 | 0.02846736 |
| 45 | 0.043885 | 0.045173347 |
| 50 | 0.037035 | 0.038645434 |
Various embodiments of the present invention are described above, above description is exemplary, and non-exclusive, and
It is not limited to disclosed each embodiment.Without departing from the scope and spirit of illustrated each embodiment, for this skill
Many modifications and changes are obvious for the those of ordinary skill in art field.
Claims (2)
1. a kind of Ultrasonic water meter flow velocity modification method for propagating the time difference and drift error based on non-measured section, it is characterised in that the party
Method the following steps are included: S1, calculate non-measured section of propagation time the step of；S2, drift error and temperature curve are established
Step；S3, instantaneous line flow velocity is calculated；
Step S1 specifically:
Step S1-1, checking table sends calibration command and reference temperature T to Ultrasonic water meterr；
Step S1-2, sample it in reference temperature T using Ultrasonic water meterrThe sum of the suitable of lower zero delivery, adverse current propagation time
SumTofTr；
Step S1-3, non-measured section of propagation time E is calculated using following formulaS:
ES=SumTofr-2×(L0+Ld)/Cr
Wherein: TrIndicate reference temperature, SumTofrIt is ultrasonic wave in reference temperature TrSuitable, the adverse current of the zero delivery repeatedly measured down
The average value in the sum of propagation time, L0Indicate effectively measurement length of tube, LdIndicate effectively measurement pipe diameter, CrIndicate reference temperature
TrUnder supersonic speed, pass through table look-up acquisition；
Step S2 the following steps are included:
Step S2-1, according to reference temperature TrTemperature range (T is measured with Ultrasonic water meteri, Tj), delimit temperature range Ti< Tr≤
Tj；
Step S2-2, three temperature spot T are obtainedi, Tr, TjThe measurement drift value of zero delivery
Step S2-3, reference temperature T is calculatedrReference drift value
Wherein: K (Tj,Ti) indicate temperature value and the corresponding slope for measuring drift value；
Step S2-4, under water meter operating condition, observed temperature T is obtainedmMeasurement drift value
Step S2-5, observed temperature T is calculatedmReference drift value
Step S2-6, drift error is establishedWith water meter operating condition observed temperature TmRelation curve:
Wherein: TmIndicate actual measurement temperature when Ultrasonic water meter works normally；Indicate temperature TmWhen reference drift value；Indicate temperature TmWhen measurement drift value；
In step S2-2 and step S2-4, drift value is measuredCalculating step are as follows: correspond to each temperature spot,
Suitable, the adverse current time difference value for repeatedly measuring zero delivery under corresponding temperature point respectively, calculate separately the measurement drift value of corresponding temperature point
Wherein, NχRespectively indicate the pendulous frequency under corresponding temperature, Δ tχCorresponding measurement temperature spot is respectively indicated in kth time measurement
When zero delivery suitable, adverse current time difference value, Δ tχavgRespectively indicate suitable, the adverse current time difference value of the zero delivery of corresponding measurement temperature spot
Average value；
Step S3 is specifically included:
Step S3-1, Ultrasonic water meter works normally, and calculates supersonic speed CT；
Wherein: L0Indicate effectively measurement length of tube, LdIndicate effectively measurement pipe diameter, (L0+Ld) indicate effectively measurement sound path,
SumTofTIt is ultrasonic wave in the sum of suitable, adverse current propagation time, SumTof at temperature T in actual workT=tup+tdwon,
tup、tdwonRespectively indicate suitable, the adverse current propagation time；ESIndicate non-measured section of propagation time；
Step S3-2, according to supersonic speed CTIt tables look-up and obtains actual temperature T；
Step S3-3, instantaneous line flow velocity V is calculatedL；
Wherein, K (Ld,LD) indicate effectively measurement pipe diameter LdWith hose nozzle diameter diameter LDUndergauge coefficient, KΔTIndicate actual temperature
The temperature compensation coefficient of T, CTIndicate supersonic speed, Δ t indicates that ultrasonic wave is propagated in the suitable, adverse current at temperature T in actual work
The difference of time, EOm(Adapt)Indicate drift error.
2. a kind of Ultrasonic water meter flow velocity amendment side for propagating the time difference and drift error based on non-measured section according to claim 1
Method, it is characterised in that further include step S4 after step S3: according to section where line flow velocity, corresponding Calibration equation pair is transferred
Flow velocity is corrected, and calculates instantaneous flow compared with standard value, carries out flux modification using drift value.
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| CN112595373B (en) * | 2020-11-24 | 2022-12-06 | 宁波水表(集团)股份有限公司 | Ultrasonic water meter design method and system |
| CN112611462B (en) * | 2020-12-30 | 2021-11-02 | 广东电网有限责任公司电力科学研究院 | Multi-stage calibration method, device, medium and terminal equipment for GIS conductor detection temperature |
| CN112833999A (en) * | 2021-03-04 | 2021-05-25 | 宁波水表(集团)股份有限公司 | Rapid meter calibration method for ultrasonic water meter |
| CN113094652B (en) * | 2021-03-30 | 2023-04-25 | 中国科学院生态环境研究中心 | Water meter water quantity metering loss determining method and system |
| CN113959511B (en) * | 2021-10-21 | 2024-02-13 | 宁波水表(集团)股份有限公司 | Flow metering method, equipment, medium and product based on jet flow water meter |
| CN115727909B (en) * | 2022-11-29 | 2023-06-09 | 青岛鼎信通讯科技有限公司 | Method for reducing zero drift of ultrasonic water meter |
| CN116147741B (en) * | 2023-01-12 | 2024-05-31 | 宁夏隆基宁光仪表股份有限公司 | NB-IoT based ultrasonic water meter flow calibration method and system |
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