CN104089685B - Improve the conforming method of transit time ultrasonic ripple heat quantity flow measurement error - Google Patents
Improve the conforming method of transit time ultrasonic ripple heat quantity flow measurement error Download PDFInfo
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Abstract
The invention discloses a kind of improve the conforming method of transit time ultrasonic ripple heat quantity flow measurement error, change by the original sampling data △ T of propagation time difference in measurement process breaker in middle valve moment ultrasound wave concurrent-countercurrent in water for the monitoring, accurately judge the moment of switch valve, it is simultaneously introduced main integrated flux and temporary cumulative data on flows, only pass through to judge to be that the real temporary cumulative flow measuring just can fill in main integrated flux, otherwise will abandon, the accuracy of cumulative volume in whole measurement process for the meter is ensured with this, it is to avoid count more.The present invention ensure that meter error will not produce saltus step, thus improving the concordance of flow error.The present invention solves flow error and is susceptible to saltus step on different detection stage bodies, that is, the impact of examined stage body and cause error consistency difference problem.
Description
Technical field
The present invention relates to a kind of improve the conforming method of transit time ultrasonic ripple heat quantity flow measurement error.
Background technology
The detection stage body flow measurement error being currently, there are in different ultrasonic calorimeters is different, and main cause exists
Different in the time of various detection stage body switch valves and dynamics.During valve opening and pass valve, easy output water hammer,
When causing valve opening, closing valve, flow field changes, or even produces backflow situation, thus the standard that can not correctly judge valve opening or close valve
Really the moment, cause flow measurement inaccurate, the situation of many meters occurs；Thereby result in the saltus step of error, the essence of impact flow measurement
Degree, reduces the concordance of error.
Content of the invention
It is an object of the invention to provide when one kind carries out flow detection to ultrasonic calorimeter on monitor station, can precisely sentence
The conforming method of raising transit time ultrasonic ripple heat quantity flow measurement error of the exact time of kick-off valve and pass valve.
The conforming method of this raising transit time ultrasonic ripple heat quantity flow measurement error that the present invention provides, the method
Including valve opening determination methods and pass valve determination methods,
Defining original data set is M original data storage continuous in time in a circulation array；Initial data
Sampled data by the propagation time difference in the every 250 milliseconds of ultrasound wave being done concurrent-countercurrents in water；Effectively raw value
It is designated as G, invalid raw value is designated as B；Main integrated flux is to ensure flow in the case of normally being measured, often
The accumulated value of 250 milliseconds of flow volume done；Temporary cumulative flow is to guarantee flow in the feelings normally measured
Under condition, the accumulated value of every 250 milliseconds of flow volume done；Define AVPIt is in normal metering process, nearest M is continuously G
The sliding average of the initial data of value；Define AVXFor closing under valve or abnormality processing flow process, G-value in continuous N initial data
Meansigma methodss；
(1) valve opening determination methods；
Step 1, original data set resets, and puts total data for B value；Stop main integrated flux metering, stop temporary cumulative
Flow measurement；Start to detect initial data；
Step 2, when current initial data is detected for G-value, starts temporary cumulative flow measurement, stops main integrated flux
Metering, starts the judgement of valve opening；This metric results is charged to temporary cumulative flow, current initial data is put into former simultaneously
Beginning data set；
Step 3, the more N number of initial data of continuous reading, if this N number of initial data is G-value, that is, get continuous N+1
The individual initial data with G-value, then be judged as valve opening, and N+1 temporary cumulative flow measurement of acquisition is filled into main integrated flux
In metering, temporary cumulative flow resets, and flow enters normal metering, starts main integrated flux metering, stops temporary cumulative stream
Gauge amount；Wherein, N and M is necessary for positive integer, and (N+1)/M=75%, M >=8；
(2) valve determination methods are closed；
Step 4, is carried out in normal metering process in flow, when 1 B value in original data set or current G-value
Less than a front G-value half when, start close valve judgement；Stop the metering of main integrated flux, start temporary cumulative flow
Metering；Continuously read M-1 up-to-date initial data again, each metric results are counted temporary cumulative flow, simultaneously that this is former
Beginning data puts into original data set；
Step 5, obtains described AVPValue and described AVXValue；
Step 6, when in original data set initial data for B value ratio be more than 60% when, or work as original data set Central Plains
Beginning data is 30%～60% and A for the ratio of B valueVX＜ 0.75AVPDuring establishment, then it is judged as closing valve, by this institute promising B value
Initial data abandons, and temporary cumulative flow is reset.
Described invalid raw value is to represent that the propagation time difference in ultrasound wave concurrent-countercurrent in water is less than 500 skins
The raw value that propagation time difference in concurrent-countercurrent in exception or water is negative value occurred in second, measurement process.
When current initial data is detected in described step 2 for B value, go to step 1, re-start the judgement of valve opening.
There is one for B value in the continuous N number of initial data reading in described step 3, then judge it is not valve opening, remove interim
Integrated flux measures, and goes to step 1, re-starts the judgement of valve opening.
In described step 6 when in original data set initial data for B value ratio be less than 30% when, start abnormality processing stream
Journey, confirms as the saltus step of flow, starts backoff algorithm, and that is, with B value, this B value is replaced by G-value below, temporarily tiring out after calculating
Meter flow fills in main integrated flow, and temporary cumulative flow resets, and starts the metering of main integrated flux, stops temporary cumulative flow
Metering.
In described step 6 when in original data set initial data be 30%～60% it is determined that for original for the ratio of B value
Loss of data, starts abnormality processing flow process；If AVX≥0.75AVPIt is determined that losing for initial data during establishment, starting and compensating
This B value is replaced by algorithm with B value G-value below, the interim integrated flow after calculating is filled in main integrated flow, tires out temporarily
Meter flow resets, and starts the metering of main integrated flux, stops the metering of temporary cumulative flow.
The present invention passes through the change of monitoring initial data during switch valve, accurately judges the moment of switch valve, with
When introduce main integrated flux and temporary cumulative data on flows, only passing through to judge is the temporary cumulative flow just meeting of real metering
Fill in main integrated flux, otherwise will abandon, disregard and become owner of in integrated flux, thereby ensure that meter in whole measurement process
Cumulative volume accuracy, thus avoiding count more.Additionally, the present invention can also ensure that meter error will not produce saltus step, from
And further increasing the concordance of flow error.
Brief description
Fig. 1 is the ultrasonic fluid flow measurement schematic diagram of the present invention.
Fig. 2 is that the valve opening of the present invention judges and process chart.
Fig. 3 is that the pass valve of the present invention judges data abnormality processing flow chart.
Specific embodiment
As shown in figure 1, the present invention is mainly adapted to the flow measurement of transit time ultrasonic ripple calorimeter：Apply a pair of ultrasound wave
Transducer replaces (or simultaneously) transmitting-receiving ultrasound wave in opposite directions, by observing ultrasound wave following current in media as well and adverse current propagation time difference
Indirectly to measure the flow velocity of fluid, then by flow velocity come calculated flow rate.
Time difference type flow-measuring method is pressed following equation first and is obtained data correlation time.
In formula, L1Length for the propagation between sound wave in a liquid two reflectings surface；L2For sound wave in a liquid reflecting surface with
The length of the propagation between transducer；D is internal diameter of the pipeline；The speed that when C is static, sound wave is propagated in a liquid；V is stream in pipe
Body is along the mean flow rate of pipe axial direction；T1For the acoustic beam propagation time in the positive direction；T2For during propagation in reverse direction for the acoustic beam
Between；△ T is propagation time difference in forward and reverse both direction for the acoustic beam.
After obtaining above-mentioned time data, then it is calculated as follows out instantaneous delivery q.
In actual environment, because of C>1400m/s, V<10m/s；Therefore C2>>V2, V-value is negligible, then by formula (3)
Instantaneous delivery in pipeline：
By formula (4) and formula (5) Shi Ke get：
Wherein, D, C and L2It is constant；C value can be obtained by look-up table；And △ T is to be obtained by measurement, therefore △ T is (i.e.
Propagation time difference in ultrasound wave concurrent-countercurrent in water) measurement accuracy be to ensure that the heaviest of flow accuracy and error consistency
The factor wanted.
The present invention passes through propagation time difference in measurement process breaker in middle valve moment ultrasound wave concurrent-countercurrent in water for the monitoring
Sample source data Δ T change, accurately judge valve opening with close valve moment.
Before implementing the present invention, first to be defined as below or be set.
1st, the explanation of initial data and original data set and process.
Initial data Δ T refers to the sampling of the propagation time difference in the every 250 milliseconds of ultrasound wave being done concurrent-countercurrents in water
Data.
Original data set is M original data storage continuous in time in a circulation array.Table 1 show M=8
When, the arrangement situation of each initial data in the original data set of the present invention.
Table 1：
| ΔTi-7 | ΔTi-6 | ΔTi-5 | ΔTi-4 | ΔTi-3 | ΔTi-2 | ΔTi-1 | ΔTi |
In order to preferably illustrate, the present invention represents effective raw value with G (Good)；Represent invalid with B (Bad)
Raw value.Wherein, invalid raw value is to represent that the propagation time difference in ultrasound wave concurrent-countercurrent in water is less than 500
The situation that propagation time difference in concurrent-countercurrent in exception or water is negative value occurs in psec, measurement process.
2nd, the explanation of main integrated flux and temporary cumulative flow.
Main integrated flux refers to ensureing flow in the case of normally being measured, every 250 milliseconds of flow body done
Long-pending accumulated value.
Temporary cumulative flow refers to cannot guarantee flow in the case of normally being measured, and every 250 milliseconds are done
The accumulated value of flow volume.
The present invention includes valve opening determination methods and closes valve determination methods, two methods be respectively used to accurately to judge valve opening and
Close the moment of valve.
As shown in Fig. 2 the present invention valve opening judge and handling process details are as follows.
Set：Original data set includes 8 initial datas, and that is, M is 8.
(1) first original data set is reset, whole 8 data are B value.
(2) stop the metering of main integrated flux and temporary cumulative flow.Start to detect initial data.
(3) when up-to-date initial data is detected for B value, come back to the first step, re-start the judgement of valve opening.
When up-to-date initial data is detected for G-value, start the metering of temporary cumulative flow, stop main integrated flux
Metering；This metric results is counted temporary cumulative flow, initial data is put into original data set simultaneously.Go to step (4),
Start the judgement of valve opening.
(4) read up-to-date initial data, each metric results are counted temporary cumulative flow, simultaneously by this initial data
Put into original data set.
(5) see whether read 5 initial datas, if so, then each initial data reading is counted temporary cumulative stream
In amount；Otherwise continue to read initial data.
(6) judge this 5 initial datas whether all for G-value, i.e. whether continuously to occur in that the initial data that 6 is G-value
(that including that triggering carries out that valve opening judges as the initial data of G-value).
(7) if continuously 6 G occur, being judged as valve opening, the temporary cumulative flow of 6 times filled in main integrated flux,
And temporary cumulative data on flows is reset, flow enters the normal metering measured, start main integrated flux, stops temporary cumulative
The metering of flow.
Without continuous, 6 G occur, then judge it is not valve opening, then remove temporary cumulative flow, go to step (1), weight
Newly carry out the judgement of valve opening.
As shown in figure 3, the pass valve of the present invention judges data abnormality processing flow process, and details are as follows.
(1) define AV8It is in normal metering process, the sliding average of the nearest 8 continuous initial datas being G-value.?
Flow carries out in normal metering process, all the time from the beginning of currency, preserves continuously nearest 8 initial datas.
(2) carry out in normal metering process in flow, when 1 B value in original data set or current G-value than front
When G-value once is less than the situation of half, starts and close valve or abnormality processing flow process.
(3) under closing valve or abnormality processing handling process, stop the metering of main integrated flux, start temporary cumulative flow
Metering.
(4) define AVXFor closing under valve or abnormality processing flow process, the meansigma methodss of G-value in continuous 8 initial datas.
(5) when number of times B value in above-mentioned 8 secondary data, is less than or equal to 2 times, confirm as the saltus step of flow, start and compensate
Algorithm：With current B value G-value below, this B value is replaced, the interim integrated flow after calculating is filled in main integrated flow, faces
When integrated flux reset, start main integrated flux metering, stop temporary cumulative flow metering.
When number of times B value in above-mentioned 8 secondary data initial datas, is equal to 3 times or is equal to 4 times,
If AVX≥0.75AV8Set up, be defined as initial data and lose, start backoff algorithm：Will with B value G-value below
This B value is replaced, and the interim integrated flow after calculating is filled in main integrated flow, interim integrated flow resets, starts main accumulation
The metering of flow, stops the metering of temporary cumulative flow.
Otherwise, it determines for closing valve, this 8 secondary data is abandoned, interim integrated flow resets.
When number of times B value in above-mentioned 8 secondary data, is more than or equal to 5 times, confirm to have closed valve, this 8 secondary data is lost
Abandon, interim integrated flow resets.
With reference to embodiment, the present invention is further illustrated.
Assume the transit time ultrasonic ripple calorimeter of DN20 is carried out under 50 degree of water temperatures with the flow detection of conventional flow point, use
Fairly simple mode judging the concordance of flow error, detects 3 times altogether, obtains 3 error value, maximum error with
The difference of little error is exactly the concordance of meter flow error.The time of detection is 1 minute every time, and the normal volume of detection is 50
Rise, the every 250 milliseconds sampled data Δ T psecs obtaining the propagation time difference in 1 ultrasound wave concurrent-countercurrent in water.And instantaneously flow
The transformational relation of amount q and Δ T has talked about (see formula (6)), that is, in the foregoing description：Q=K × Δ T (m3/ h), wherein,
K value under 50 degree of water temperatures for the transit time ultrasonic ripple calorimeter of DN20 is 10, then q=10 × Δ T (m3/h).
The present invention it is critical only that the process in valve opening and pass valve for the ultrasonic calorimeter.Below by way of with existing common side
Method in valve opening and closes the conforming contrast of valve time error, verifies effectiveness of the invention and superiority.Assume in 3 detection process
In, only the raw measurement data Δ T in valve opening and pass valve is different, and the raw measurement data in detection process is phase
With, line justification just can be simply entered in comparison by such manner very much.The Δ T data of all measurements is presented herein below, in order such as
Under：
Explanation：In commonsense method, if the value of Δ T is less than 500 psecs or negative value it is believed that being exceptional value, other data
The calculating of equal integrated flow.
(1) measurement contrast for the first time.
Data during valve opening is shown in Table 2, is the initial data of 16 Time Continuous, from the Ith row high order end of table 2 to the IIth row
Low order end.
Table 2：
| Ⅰ | -60 | 262 | 6456 | 8598 | -91 | -114 | -133 | 45 |
| Ⅱ | -48 | -136 | 89980 | 108990 | 1372660 | 145320 | 186570 | 208954 |
Pilot process is to enter normal metering phase, and initial data herein omits to be disregarded.
The data closing valve is shown in Table 3, is the initial data of 16 Time Continuous, from the Ith row high order end to the IIth row of table 3
Right-hand member.
Table 3：
| Ⅰ | 237690 | 236583 | 236295 | 238775 | 237338 | 237694 | 237582 | 237139 |
| Ⅱ | -156 | -189 | 24850 | -110 | 21840 | 13360 | -80 | -56 |
In valve opening with when closing valve, the bulking value of many meters is 0.52 liter according to commonsense method.
According to the present invention in valve opening with when closing valve, the bulking value of many meters is：0 liter.
(2) second measurement data.
Data during valve opening is shown in Table 4, is the initial data of 16 Time Continuous, from the Ith row high order end of table 4 to the IIth row
Low order end.
Table 4：
| Ⅰ | -60 | -80 | -85 | -100 | -91 | -114 | -133 | 45 |
| Ⅱ | -48 | -136 | 89980 | 108990 | 1372660 | 145320 | 186570 | 208954 |
Pilot process is to enter normal metering phase, and initial data herein omits to be disregarded.
The data closing valve is shown in Table 5, is the initial data of 16 Time Continuous, from the Ith row high order end to the IIth row of table 5
Right-hand member.
Table 5：
| Ⅰ | 237690 | 236583 | 236295 | 238775 | 237338 | 237694 | 237582 | 237139 |
| Ⅱ | -156 | -179 | -120 | -110 | -50 | -90 | -80 | -56 |
In valve opening with when closing valve, the bulking value of many meters is 0 liter according to commonsense method.
According to the present invention in valve opening with when closing valve, the bulking value of many meters is：0 liter.
(3) third time measurement data.
Data during valve opening is shown in Table 6, is the initial data of 16 Time Continuous, from the Ith row high order end of table 6 to the IIth row
Low order end.
Table 6：
| Ⅰ | 780 | 890 | 759 | 689 | -91 | -114 | -133 | 45 |
| Ⅱ | -48 | -136 | 89980 | 108990 | 1372660 | 145320 | 186570 | 208954 |
Pilot process is to enter normal metering phase, and initial data herein omits to be disregarded.
The data closing valve is shown in Table 7, is the initial data of 16 Time Continuous, from the Ith row high order end to the IIth row of table 3
Right-hand member.
Table 7：
In valve opening with when closing valve, the bulking value of many meters is 0.7 liter according to commonsense method.
According to the present invention in valve opening with when closing valve, the bulking value of many meters is：0 liter.
Can be seen that from the testing results of above three times：
1st, according to the maximum saltus step that commonsense method calculates 3 times it is：At most once the volume of many meters is 0.7 liter, and minimum is once
The volume of many meters is 0 liter, and the normal volume of measurement is 50 liters, then according to the flow error of the calculated meter of commonsense method
Concordance be 1.4%.
2nd, according to the maximum saltus step that the inventive method calculates 3 times it is：At most once the volume of many meters is 0 liter, and minimum is once
Volume be 0 liter, the normal volume of measurement is 50 liters, then according to the flow error of the calculated meter of the inventive method
Concordance is 0.0%.
As can be seen here, 1.4% (concordance can be improved by the concordance of the flow error of ultrasonic calorimeter of the present invention
Error bigger explanation concordance is bad.
Claims (5)
1. a kind of improve the conforming method of transit time ultrasonic ripple heat quantity flow measurement error it is characterised in that the method bag
Include valve opening determination methods and close valve determination methods,
Defining original data set is M original data storage continuous in time in a circulation array；Initial data is every
The sampled data of the propagation time difference in the 250 milliseconds of ultrasound wave being done concurrent-countercurrents in water；Effectively raw value is designated as
G, invalid raw value is designated as B, and described invalid raw value is the biography representing in ultrasound wave concurrent-countercurrent in water
Broadcast the feelings that time difference is negative value less than the propagation time difference occurring in concurrent-countercurrent in exception or water in 500 psecs, measurement process
Condition；Main integrated flux is ensureing flow in the case of normally being measured, every 250 milliseconds of flow volume done cumulative
Value；Temporary cumulative flow is cannot to guarantee flow in the case of normally being measured, every 250 milliseconds of flow volume done
Accumulated value；Define AVPIt is in normal metering process, the sliding average of the nearest M continuous initial data being G-value；Definition
AVXFor closing under valve or abnormality processing flow process, the meansigma methodss of G-value in continuous N initial data；
(1) valve opening determination methods；
Step 1, original data set resets, and puts total data for B value；Stop main integrated flux metering, stop temporary cumulative flow
Metering；Start to detect initial data；
Step 2, when current initial data is detected for G-value, starts temporary cumulative flow measurement, stops main flow totalizer
Amount, starts the judgement of valve opening；This metric results is charged to temporary cumulative flow, current initial data is put into original simultaneously
Data set；
Step 3, the more N number of initial data of continuous reading, if this N number of initial data is G-value, that is, get continuous N+1 tool
There is the initial data of G-value, be then judged as valve opening, N+1 temporary cumulative flow measurement of acquisition is filled into main integrated flux metering
In, temporary cumulative flow resets, and flow enters normal metering, starts main integrated flux metering, stops temporary cumulative effusion meter
Amount；Wherein, N and M is necessary for positive integer, and (N+1)/M=75%, M >=8；
(2) valve determination methods are closed；
Step 4, is carried out in normal metering process in flow, when original data set 1 B value of appearance or the current G-value of appearance are less than
During the half of a front G-value, start the judgement closing valve；Stop the metering of main integrated flux, start the metering of temporary cumulative flow；
Continuously read M-1 up-to-date initial data again, each metric results are counted temporary cumulative flow, simultaneously by this initial data
Put into original data set；
Step 5, obtains described AVPValue and described AVXValue；
Step 6, when in original data set, initial data is more than 60% for the ratio of B value, or when original number in original data set
It is 30%～60% and A according to the ratio for B valueVX＜ 0.75AVPDuring establishment, then it is judged as closing valve, this institute promising B value is original
Data abandons, and temporary cumulative flow is reset.
2. the raising conforming method of transit time ultrasonic ripple heat quantity flow measurement error according to claim 1, it is special
Levy and be, when current initial data is detected in described step 2 for B value, go to step 1, re-start the judgement of valve opening.
3. the raising conforming method of transit time ultrasonic ripple heat quantity flow measurement error according to claim 1, it is special
Levy and be, have one for B value in the continuous N number of initial data reading in described step 3, then judge it is not valve opening, remove interim
Integrated flux measures, and goes to step 1, re-starts the judgement of valve opening.
4. the raising conforming method of transit time ultrasonic ripple heat quantity flow measurement error according to claim 1, it is special
Levy and be, in described step 6 when in original data set initial data for B value ratio be less than 30% when, start abnormality processing stream
Journey, confirms as the saltus step of flow, starts backoff algorithm, and that is, with B value, this B value is replaced by G-value below, temporarily tiring out after calculating
Meter flow fills in main integrated flow, and temporary cumulative flow resets, and starts the metering of main integrated flux, stops temporary cumulative flow
Metering.
5. the raising conforming method of transit time ultrasonic ripple heat quantity flow measurement error according to claim 1, it is special
Levy and be, in described step 6 when in original data set initial data be 30%～60% it is determined that for original for the ratio of B value
Loss of data, starts abnormality processing flow process；If AVX≥0.75AVPIt is determined that losing for initial data during establishment, starting and compensating
This B value is replaced by algorithm with B value G-value below, the interim integrated flow after calculating is filled in main integrated flow, tires out temporarily
Meter flow resets, and starts the metering of main integrated flux, stops the metering of temporary cumulative flow.
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| CN107255438B (en) * | 2017-04-25 | 2023-05-26 | 中国计量大学 | Simple micro-angle change measuring device for reflecting sheet of ultrasonic water meter |
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