CN107655552A - A kind of Ultrasonic water meter flow velocity modification method based on the non-measured section of propagation time difference and drift error - Google Patents

A kind of Ultrasonic water meter flow velocity modification method based on the non-measured section of propagation time difference and drift error Download PDF

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CN107655552A
CN107655552A CN201711118256.2A CN201711118256A CN107655552A CN 107655552 A CN107655552 A CN 107655552A CN 201711118256 A CN201711118256 A CN 201711118256A CN 107655552 A CN107655552 A CN 107655552A
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msub
mrow
temperature
drift
water meter
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CN107655552B (en
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任尚德
薛军
陆寒熹
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NANJING LINYANG ELECTRIC POWER TECHNOLOGY CO LTD
Jiangsu Linyang Solarfun Co Ltd
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NANJING LINYANG ELECTRIC POWER TECHNOLOGY CO LTD
Jiangsu Linyang Solarfun Co Ltd
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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
    • 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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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Measuring Volume Flow (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)

Abstract

A kind of Ultrasonic water meter flow velocity modification method based on the non-measured section of propagation time difference and drift error, it comprises the following steps：Under accurate measurement reference temperature suitable, the adverse current time and, be averaged by multiple repairing weld, calculate non-measured section time and；The time difference repeatedly measured according to reference temperature, minimum temperature, maximum temperature, calculate reference drift and calibration drift；Maskable non-measured time during real flow measurement, calibration measurement section time difference value, actual temperature drift is removed, enter trip temperature inverse, Reynolds number compensation.The present invention calculates measuring section effective time difference and non-measured section of error by hydrostatic meter under single point temperature, solves error caused by the processing and assembling of base table and transducer；By establishing drift and temperature curve, drift value is effectively removed, reduces error caused by timing chip resolution deficiency, temperature-compensating correction is carried out by real flow measurement inverse temperature, dispatch from the factory and carry out an accurate calibration, Measurement Algorithm is simple when reality measures, and the accuracy of measuring is high.

Description

A kind of Ultrasonic water meter flow velocity amendment based on the non-measured section of propagation time difference and drift error Method
Technical field
The invention belongs to water meter measurement detection technique field, is specifically that one kind propagates the time difference and drift mistake based on non-measured section The Ultrasonic water meter flow velocity modification method of difference.
Background technology
At present, non-linear, the processing of the wired mean flow rate of factor and face mean flow rate that influence ultrasonic water meter error fill With error, TDC timing resolutions caused by temperature change under error, non-measured section of error, the influence of inner-walls of duct roughness, normal pressure Error, timing terminate the unstable caused error of echo, fluids within pipes interference, the caused mistake of characteristic correction caused by deficiency Vibrations and mounting condition are unsatisfactory for the error brought in difference, pipe.
Fractional error factor can pass through piecewise linearity
Correction or fitting a straight line correction, increase timing resolution, design the more reliable stop ripples of filter circuit acquisition, increase Add rectifying component, front and rear increase straight length, increase temperature sensor or compensate correlated error using means such as accurate temperature inverses；Zero Drift, the error of non-measured section of introducing mostly force to repair using the amendment of external detection device or correction coefficient, do not refer to compared with Excellent solution.
Way general at present is the machining accuracy that pipeline sound path L depends on pipeline section producer, the ultrasonic wave warp actually measured The sound path crossed contains the centre distance of two reflectings surface, the centre distance of 2 times of transducer to reflecting surface.Because transducer 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 actual survey The way that inverse temperature and the difference of observed temperature compensate during amount, thus brings hardware cost to increase；TDC timing chip point Error caused by resolution itself is drift, generally individually tests drift by outward element, do not change original base table structure and Not without preferably solution on the premise of external equipment.
The content 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, outside nothing Subsidiary equipment, actual measurement sound path is accurately calculated by algorithm, establishes drift and temperature variation curve, using sectional calibration Method realize the accurate measurement of family Ultrasonic water meter.
The technical scheme is that：
The present invention provides a kind of Ultrasonic water meter flow velocity modification method based on the non-measured section of propagation time difference and drift error, should Method comprises the following steps：S1, calculate the step of non-measured section of propagation time；S2, establish drift error and temperature curve The step of；S3, calculate instantaneous line flow velocity.
Further, step S1 is specially：
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 Time sum, obtain 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：TrRepresent reference temperature, SumTofrIt is ultrasonic wave in reference temperature TrThe zero delivery repeatedly measured down it is suitable, The average value of adverse current propagation time sum, L0Represent effectively measurement length of tube, LdRepresent effectively measurement pipe diameter, CrRepresent reference Temperature TrUnder supersonic speed, acquisition of tabling look-up.
Further, step S2 comprises the following steps：
Step S2-1, according to reference temperature TrWith Ultrasonic water meter measurement temperature scope (Ti, 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) represent slope of the temperature value with corresponding measurement drift value；
Step S2-4, under water meter operating mode, 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 mode observed temperature TmRelation curve：
Wherein：TmRepresent actual measurement temperature during Ultrasonic water meter normal work；Represent temperature TmWhen reference drift Value；Represent temperature TmWhen measurement drift value.
Further, in step S2-2 and step S2-4, drift value is measuredCalculation procedure be：It is right Ying Yusan temperature spot, suitable, the adverse current time difference value of zero delivery under corresponding temperature point are repeatedly measured respectively, calculates corresponding temperature respectively The measurement drift value of point
Wherein, NχThe pendulous frequency under corresponding temperature, Δ t are represented respectivelyχRepresent corresponding measurement temperature point in kth time respectively Suitable, the adverse current time difference value of zero delivery during measurement, Δ tχavgWhen representing the suitable of zero delivery, the adverse current of corresponding measurement temperature point respectively The average value of difference.(discreteness of measurement point can be explained in standard deviation, while ceases manner of breathing with the timing resolution of timing chip itself Close, therefore take standard deviation as drift standard).
Further, step S3 is specifically included：
Step S3-1, Ultrasonic water meter normal work, supersonic speed C is calculatedT；
Wherein：L0Represent effectively measurement length of tube, LdRepresent effectively measurement pipe diameter, (L0+Ld) represent effective measurement sound Journey, SumTofTSuitable, adverse current propagation time sum, the SumTof under temperature T that are ultrasonic wave in real workT=tup+tdwon, tup、tdwonSuitable, the adverse current propagation time is represented respectively；ESRepresent non-measured section of propagation time；
Step S3-2, according to supersonic speed CTTable look-up and obtain actual temperature T；(velocity of sound and temperature relation table)
Step S3-3, instantaneous line flow velocity V is calculatedL；
Wherein, K (Ld,LD) represent effectively measurement pipe diameter LdWith hose nozzle footpath diameter LDUndergauge coefficient, KΔTRepresent actual Temperature T temperature compensation coefficient, CTSupersonic speed is represented, Δ t represents under temperature T suitable, adverse current of the ultrasonic wave in real work The difference in propagation time, EOm(Adapt)Represent drift error.
Further, after step S3, in addition to step S4：Traffic alignment is carried out by Stepwise calibration.
Beneficial effects of the present invention：
The present invention is only needed under a steady temperature on the premise of not changing base table structure and not increasing subsidiary equipment Accurate measurement, draws non-measured section of error, and the precision of measuring section is improved in real flow measurement, reduces and 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, calculates reference zero Drift, establishes drift and temperature curve, the discreteness of TDC timing chip measurement is detected using standard deviation, dynamic measuring drift is with temperature The variation characteristic of degree, reduce the error that timing chip resolution deficiency is brought.
The present invention proposes a kind of non-measured time of removal, the method for drift, the metering of effective measuring section is more defined Really, by the primary calibration that dispatches from the factory, inverse temperature carries out Reynolds number compensation when reality measures, 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 the drawings, for those skilled in the art, the present invention There can be various modifications and variations.The various changes of the present invention, the equivalent changed are in claims of the present invention content In covering scope.
It is same as the prior art or prior art can be used to realize that the present invention is not directed to technology, therefore not in the present invention It is described in detail.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Brief description of the drawings
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 number Typically represent same parts.
Fig. 1 measurement pipe structure charts.
Fig. 2 drifts and temperature profile.
Fig. 3 calibration algorithm flow charts.
Embodiment
The preferred embodiment of the present invention is more fully described below with reference to accompanying drawings.Although the present invention is shown in accompanying 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.
It is a kind of based on the non-measured section of Ultrasonic water meter flow velocity modification method for propagating the time difference and drift error, this method include with Lower step：
S1, calculate the step of non-measured section of propagation time；
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 Sum SumTofTr；
Step S1-3, non-measured section of propagation time E is calculated using following formulaS：
ES=SumTofr-2×(L0+Ld)/Cr
Wherein：TrRepresent reference temperature, SumTofrIt is ultrasonic wave in reference temperature TrThe zero delivery repeatedly measured down it is suitable, The average value of adverse current propagation time sum, L0Represent effectively measurement length of tube, LdRepresent effectively measurement pipe diameter, CrRepresent reference Temperature TrUnder supersonic speed, acquisition of tabling look-up.
S2, establish the step of drift error and temperature curve；
Step S2-1, according to reference temperature TrWith Ultrasonic water meter measurement temperature scope (Ti, 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) represent slope of the temperature value with corresponding measurement drift value；
Step S2-4, under water meter operating mode, 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 mode observed temperature TmRelation curve：
Wherein：TmRepresent actual measurement temperature during Ultrasonic water meter normal work；Represent temperature TmWhen reference drift Value；Represent temperature TmWhen measurement drift value.
S3, calculate instantaneous line flow velocity；
Step S3-1, Ultrasonic water meter normal work, supersonic speed C is calculatedT；
Wherein：L0Represent effectively measurement length of tube, LdRepresent effectively measurement pipe diameter, (L0+Ld) represent effective measurement sound Journey, SumTofTSuitable, adverse current propagation time sum, the SumTof under temperature T that are ultrasonic wave in real workT=tup+tdwon, tup、tdwonSuitable, the adverse current propagation time is represented respectively；ESRepresent non-measured section of propagation time；
Step S3-2, according to supersonic speed CTTable look-up and obtain actual temperature T；
Step S3-3, instantaneous line flow velocity V is calculatedL；
Wherein, K (Ld,LD) represent effectively measurement pipe diameter LdWith hose nozzle footpath diameter LDUndergauge coefficient, KΔTRepresent actual Temperature T temperature compensation coefficient, CTSupersonic speed is represented, Δ t represents under temperature T suitable, adverse current of the ultrasonic wave in real work The difference in propagation time, EOm(Adapt)Represent drift error.
During specific implementation：
The present embodiment takes reference temperature T exemplified by measuring the copper pipeline section Ultrasonic water meters 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 centre-to-centre spacing Lt=0.063m.
Following steps are zero delivery calibration measurement：
1) suitable, adverse current propagation time sum SumTof of continuous sampling n times (N >=32) zero deliveryi。
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 obtains it and put down Average, according to formulaCalculate TjWhen driftTiWhen driftTherefore reference driftAccording to reference zero Drift, actual measurement drift is taken with reference drift difference to calibrate actual drift, therefore the drift curve under actual temperature is
As seen from the above equation, actual drift is temperature with measuring the function of drift, it is necessary to calculate measurement in real flow measurement Drift, and inverse temperature.
It is real flow measurement below：
5) in actual 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) according to the temperature T obtained in step 5, drift and temperature curve are substituted into, according to actual drift in step S2 and temperature Degree relation is calibrated, and obtains EOm(Adapt), it is illustrated in figure 2 and takes under portion temperature point, actual measurement drift and calibration drift curve Figure.
7) actual drift substitutes into flow relocity calculation formulaWherein L is Effectively measurement sound path.
8) judge to work as front flow velocity VLIn which flow velocity section, different Calibration equations are called to carry out flow rate correction.
The portion temperature point of table 1 measures drift and the calibration drift table of comparisons
Temperature (DEG C) Measure drift (ns) Calibrate 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
It is described above various embodiments of the present invention, described above is exemplary, and non-exclusive, and It is not limited to disclosed each embodiment.In the case of without departing from the scope and spirit of illustrated each embodiment, for this skill Many modifications and changes will be apparent from for the those of ordinary skill in art field.

Claims (7)

  1. It is 1. a kind of based on the non-measured section of Ultrasonic water meter flow velocity modification method for propagating the time difference and drift error, it is characterised in that the party Method comprises the following steps：S1, calculate the step of non-measured section of propagation time；S2, establish drift error and temperature curve Step；S3, calculate instantaneous line flow velocity.
  2. It is 2. a kind of based on the non-measured section of Ultrasonic water meter flow velocity amendment side for propagating the time difference and drift error according to claim 1 Method, it is characterised in that step S1 is specially：
    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 sum of lower zero delivery SumTofTr；
    Step S1-3, non-measured section of propagation time E is calculated using following formulaS：
    ES=SumTofr-2×(L0+Ld)/Cr
    Wherein：TrRepresent reference temperature, SumTofrIt is ultrasonic wave in reference temperature TrSuitable, the adverse current of the zero delivery repeatedly measured down The average value of propagation time sum, L0Represent effectively measurement length of tube, LdRepresent effectively measurement pipe diameter, CrRepresent reference temperature TrUnder supersonic speed, pass through table look-up acquisition.
  3. It is 3. a kind of based on the non-measured section of Ultrasonic water meter flow velocity amendment side for propagating the time difference and drift error according to claim 2 Method, it is characterised in that in step S1-2 using Ultrasonic water meter carry out multiple repairing weld its in reference temperature TrLower zero delivery it is suitable, inverse Propagation time sum is flowed, obtains the average value of multiple repairing weld as SumTofTr。
  4. It is 4. a kind of based on the non-measured section of Ultrasonic water meter flow velocity amendment side for propagating the time difference and drift error according to claim 1 Method, it is characterised in that step S2 comprises the following steps：
    Step S2-1, according to reference temperature TrWith Ultrasonic water meter measurement temperature scope (Ti, 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
    <mrow> <msup> <msub> <mi>E</mi> <msub> <mi>O</mi> <mi>r</mi> </msub> </msub> <mo>&amp;prime;</mo> </msup> <mo>=</mo> <msub> <mi>E</mi> <msub> <mi>O</mi> <mi>j</mi> </msub> </msub> <mo>-</mo> <mrow> <mo>(</mo> <msub> <mi>T</mi> <mi>j</mi> </msub> <mo>-</mo> <msub> <mi>T</mi> <mi>r</mi> </msub> <mo>)</mo> </mrow> <mo>&amp;times;</mo> <mi>K</mi> <mrow> <mo>(</mo> <msub> <mi>T</mi> <mi>j</mi> </msub> <mo>,</mo> <msub> <mi>T</mi> <mi>i</mi> </msub> <mo>)</mo> </mrow> <mo>;</mo> </mrow>
    Wherein：K(Tj,Ti) represent slope of the temperature value with corresponding measurement drift value；
    Step S2-4, under water meter operating mode, observed temperature T is obtainedmMeasurement drift value
    Step S2-5, observed temperature T is calculatedmReference drift value
    <mrow> <msup> <msub> <mi>E</mi> <msub> <mi>O</mi> <mi>m</mi> </msub> </msub> <mo>&amp;prime;</mo> </msup> <mo>=</mo> <msub> <mi>E</mi> <msub> <mi>O</mi> <mi>j</mi> </msub> </msub> <mo>-</mo> <mrow> <mo>(</mo> <msub> <mi>T</mi> <mi>j</mi> </msub> <mo>-</mo> <msub> <mi>T</mi> <mi>m</mi> </msub> <mo>)</mo> </mrow> <mo>&amp;times;</mo> <mi>K</mi> <mrow> <mo>(</mo> <msub> <mi>T</mi> <mi>j</mi> </msub> <mo>,</mo> <msub> <mi>T</mi> <mi>i</mi> </msub> <mo>)</mo> </mrow> <mo>;</mo> </mrow>
    Step S2-6, drift error is establishedWith water meter operating mode observed temperature TmRelation curve：
    <mrow> <msub> <mi>E</mi> <msub> <mi>O</mi> <mrow> <mi>m</mi> <mrow> <mo>(</mo> <mi>A</mi> <mi>d</mi> <mi>a</mi> <mi>p</mi> <mi>t</mi> <mo>)</mo> </mrow> </mrow> </msub> </msub> <mo>=</mo> <msup> <msub> <mi>E</mi> <msub> <mi>O</mi> <mi>m</mi> </msub> </msub> <mo>&amp;prime;</mo> </msup> <mo>+</mo> <msub> <mi>E</mi> <msub> <mi>O</mi> <mi>m</mi> </msub> </msub> <mo>-</mo> <msup> <msub> <mi>E</mi> <msub> <mi>O</mi> <mi>r</mi> </msub> </msub> <mo>&amp;prime;</mo> </msup> </mrow>
    Wherein：TmRepresent actual measurement temperature during Ultrasonic water meter normal work；Represent temperature TmWhen reference drift value；Represent temperature TmWhen measurement drift value.
  5. It is 5. a kind of based on the non-measured section of Ultrasonic water meter flow velocity amendment side for propagating the time difference and drift error according to claim 4 Method, it is characterised in that in step S2-2 and step S2-4, measure drift valueCalculation procedure be：Correspond to Each temperature spot, suitable, the adverse current time difference value of zero delivery under corresponding temperature point are repeatedly measured respectively, calculate the survey of corresponding temperature point respectively Measure drift value
    <mrow> <msub> <mi>E</mi> <msub> <mi>o</mi> <mi>&amp;chi;</mi> </msub> </msub> <mo>=</mo> <msqrt> <mfrac> <mrow> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>k</mi> <mo>=</mo> <mn>1</mn> </mrow> <msub> <mi>N</mi> <mi>&amp;chi;</mi> </msub> </munderover> <msup> <mrow> <mo>(</mo> <msub> <mi>&amp;Delta;t</mi> <mi>&amp;chi;</mi> </msub> <mo>-</mo> <msub> <mi>&amp;Delta;t</mi> <mrow> <mi>&amp;chi;</mi> <mi>a</mi> <mi>v</mi> <mi>g</mi> </mrow> </msub> <mo>)</mo> </mrow> <mn>2</mn> </msup> </mrow> <msub> <mi>N</mi> <mi>&amp;chi;</mi> </msub> </mfrac> </msqrt> </mrow>
    Wherein, NχThe pendulous frequency under corresponding temperature, Δ t are represented respectivelyχRepresent corresponding measurement temperature point in kth time measurement respectively When zero delivery suitable, adverse current time difference value, Δ tχavgSuitable, the adverse current time difference value of the zero delivery of corresponding measurement temperature point are represented respectively Average value.
  6. It is 6. a kind of based on the non-measured section of Ultrasonic water meter flow velocity amendment side for propagating the time difference and drift error according to claim 1 Method, it is characterised in that step S3 is specifically included：
    Step S3-1, Ultrasonic water meter normal work, supersonic speed C is calculatedT；
    <mrow> <msub> <mi>C</mi> <mi>T</mi> </msub> <mo>=</mo> <mfrac> <mrow> <mo>(</mo> <msub> <mi>L</mi> <mn>0</mn> </msub> <mo>+</mo> <msub> <mi>L</mi> <mi>d</mi> </msub> <mo>)</mo> <mo>&amp;times;</mo> <mo>(</mo> <msub> <mi>SumTof</mi> <mi>T</mi> </msub> <mo>-</mo> <msub> <mi>E</mi> <mi>S</mi> </msub> <mo>)</mo> </mrow> <mrow> <mn>2</mn> <mo>&amp;times;</mo> <mrow> <mo>(</mo> <msub> <mi>t</mi> <mrow> <mi>u</mi> <mi>p</mi> </mrow> </msub> <mo>-</mo> <mfrac> <msub> <mi>E</mi> <mi>S</mi> </msub> <mn>2</mn> </mfrac> <mo>)</mo> </mrow> <mo>&amp;times;</mo> <mrow> <mo>(</mo> <msub> <mi>t</mi> <mrow> <mi>d</mi> <mi>w</mi> <mi>o</mi> <mi>n</mi> </mrow> </msub> <mo>-</mo> <mfrac> <msub> <mi>E</mi> <mi>S</mi> </msub> <mn>2</mn> </mfrac> <mo>)</mo> </mrow> </mrow> </mfrac> </mrow>
    Wherein：L0Represent effectively measurement length of tube, LdRepresent effectively measurement pipe diameter, (L0+Ld) effectively measurement sound path is represented, SumTofTSuitable, adverse current propagation time sum, the SumTof under temperature T that are ultrasonic wave in real workT=tup+tdwon, tup、tdwonSuitable, the adverse current propagation time is represented respectively；ESRepresent non-measured section of propagation time；
    Step S3-2, according to supersonic speed CTTable look-up and obtain actual temperature T；
    Step S3-3, instantaneous line flow velocity V is calculatedL；
    <mrow> <msub> <mi>V</mi> <mi>L</mi> </msub> <mo>=</mo> <mi>K</mi> <mrow> <mo>(</mo> <msub> <mi>L</mi> <mi>d</mi> </msub> <mo>,</mo> <msub> <mi>L</mi> <mi>D</mi> </msub> <mo>)</mo> </mrow> <mo>&amp;times;</mo> <msub> <mi>K</mi> <mrow> <mi>&amp;Delta;</mi> <mi>T</mi> </mrow> </msub> <mo>&amp;times;</mo> <mfrac> <mrow> <msup> <msub> <mi>C</mi> <mi>T</mi> </msub> <mn>2</mn> </msup> <mo>&amp;times;</mo> <mrow> <mo>(</mo> <mi>&amp;Delta;</mi> <mi>t</mi> <mo>-</mo> <msub> <mi>E</mi> <mrow> <mi>O</mi> <mi>m</mi> <mrow> <mo>(</mo> <mi>A</mi> <mi>d</mi> <mi>a</mi> <mi>p</mi> <mi>t</mi> <mo>)</mo> </mrow> </mrow> </msub> <mo>)</mo> </mrow> </mrow> <mrow> <mn>2</mn> <mrow> <mo>(</mo> <msub> <mi>L</mi> <mn>0</mn> </msub> <mo>+</mo> <msub> <mi>L</mi> <mi>d</mi> </msub> <mo>)</mo> </mrow> </mrow> </mfrac> </mrow>
    Wherein, K (Ld,LD) represent effectively measurement pipe diameter LdWith hose nozzle footpath diameter LDUndergauge coefficient, KΔTRepresent actual temperature T temperature compensation coefficient, CTSupersonic speed is represented, Δ t represents that under temperature T suitable, adverse current of the ultrasonic wave in real work are propagated The difference of time, EOm(Adapt)Represent drift error.
  7. It is 7. a kind of based on the non-measured section of Ultrasonic water meter flow velocity amendment side for propagating the time difference and drift error according to claim 1 Method, it is characterised in that after step S3, in addition to step S4：Traffic alignment is carried out by Stepwise calibration.
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