CN108444557A - A kind of NEW ADAPTIVE measurement method of ultrasonic flowmeter - Google Patents
A kind of NEW ADAPTIVE measurement method of ultrasonic flowmeter Download PDFInfo
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- CN108444557A CN108444557A CN201810222369.5A CN201810222369A CN108444557A CN 108444557 A CN108444557 A CN 108444557A CN 201810222369 A CN201810222369 A CN 201810222369A CN 108444557 A CN108444557 A CN 108444557A
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- time difference
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/667—Arrangements of transducers for ultrasonic flowmeters; Circuits for operating ultrasonic flowmeters
Abstract
The present invention relates to a kind of NEW ADAPTIVE measurement methods of ultrasonic flowmeter.The present invention proposes a kind of self-adapting measuring method with adjust automatically measurement period, and this method is based on time difference change rate, the quick tracking changed with change of fluid may be implemented.The present invention can save power consumption relative to traditional measurement method, while improve measuring accuracy.
Description
Technical field
The present invention relates to a kind of surveys of the NEW ADAPTIVE of ultrasonic flowmeter metering field more particularly to ultrasonic flowmeter
Amount method.
Background technology
The continuous popularization and application of ultrasonic technology, ultrasonic flowmeter development is very fast, is measured in this flowmeter
Period it is particularly significant, it is related to the precision and power problems of flowmeter.
In traditional flow-measuring method, due to the easy fluctuation of fluids within pipes, measurement period is fixed, if measured
Cycle T is arranged too small, can improve metering accuracy, but can increase power consumption, reduce the service life；If measurement period is too big,
Measuring accuracy can be caused to decline.Therefore, the selection of a measurement period affects the precision of entire flowmeter, if selection is bad,
It can influence the work of whole system.Deficiency based on traditional measurement method, the present invention are proposed with dynamic self-adapting measurement period side
Method is particularly important.
Invention content
The purpose of the present invention is more can accurately measure the flow velocity of fluid, increase the precision of measurement, while reducing stream
The power consumption of gauge proposes that a kind of NEW ADAPTIVE measurement method of ultrasonic flowmeter, specific technical solution are as follows：
A kind of NEW ADAPTIVE measurement method of ultrasonic flowmeter, it is necessary first to acquisition time difference sample, if (Δ t)1、
(Δt)2……(Δt)nFor n measurement sample, (Δ t)t、(Δt)t-1For adjacent time difference sample data twice, (Δ t)tFor
This time difference measured, (Δ t)t-1The time difference measured for the last time；T0For system initial measurement period, TnxFor under
One-shot measurement period, i.e. this time interval for measuring measurement next time, TcrtFor this measurement period, i.e. last time measures this
The time interval of secondary measurement；The time difference change rate measured twice is：
Wherein dt is time difference changing value,For time difference change rate；
If dtmaxIndicate that the time difference changes maximum value, if the absolute value of adjacent time of measuring difference changing value is less than twice
dtmax, then water meter can continue to continue to measure with the period；If using this time difference change rateThe time difference becomes next time for prediction
RateAnd calculate measurement period T next timenx, then must satisfy following relational expression
It can obtain：
Using in formula (3), maximum rapid fluid tracking cycle is as measurement period next time, i.e.,：
If EmaaFor the minimum average B configuration absolute error of sample time difference, then：
Wherein,For sample (Δ t)1、(Δt)2……(Δt)nAverage value.EmaaIt can be with the variation of reflecting time difference
Rate works as EmaaIt is smaller, illustrate that time difference variation is smaller, fluid is more stable；Work as EmaaIt is bigger, illustrate that the time difference changes bigger, fluid
Disturbance is big.It is demonstrated experimentally that using EmaaInstead of dtmax, preferably effect can be obtained, formula (5) can transform to：
As can be seen that work as fluid stable, | (Δ t)t-(Δt)i-1| special hour, time difference change rateAlso can very little, by
Formula (6) obtains measurement period T next timenxProbability Area is infinitely great, the possibility not measured occurs；Opposite, if flow disturbance
Greatly, time difference changing value | (Δ t)i-(Δt)i-1| it can become very big, time difference change rateAlso it can become larger, lead to TnxTend to nothing
It is poor small, with the frequency measurement being exceedingly fast, increase power consumption, or even entanglement occur.
To solve the above-mentioned problems, the bound that measurement period is set is needed.If TmaxFor maximum measurement period, TminFor most
Small measurement period, works as Tnx＜ TminOr Tnx＞ TminWhen, it is believed that exceed present scope, and works as Tnx＜ TminWhen by TnxBecome new
Tmin, work as Tnx＞ TminWhen by TnxBecome new Tmin, and calculated as measurement period next time；If Tnx＞ 0.5TminOr
Tnx＜ 0.5TminWhen, by TnxAs new TminOr Tmax；By measuring Tmax-TminIt may determine that and remove the steady of a period of time fluid
Qualitative situation.
Compared with traditional measurement method, the present invention can adjust measurement period T according to flow velocity, improve the essence of measurement
Degree：Simultaneously according to the change of measurement period T, the workload of flowmeter can be adjusted, the power consumption of flowmeter is further decreased.
Description of the drawings
When considered in conjunction with the accompanying drawings, it by referring to following detailed description, better understood when of the invention and easy
It learns the adjoint advantage of many of which, but attached drawing described herein is used to provide further understanding of the present invention, constitutes this
A part for invention, illustrative examples of the invention and explanation are not constituted for explaining the present invention to the improper of the present invention
It limits, wherein：
Fig. 1 is adaptive measuring cycle methods structural schematic diagram of the present invention.
Fig. 2 is adaptive measuring cycle methods flow diagram of the present invention.
Fig. 3 is fluid stable state measurement contrast schematic diagram of the present invention.
Fig. 4 is flow disturbance state measurement contrast schematic diagram of the present invention.
Specific implementation mode
Below in conjunction with the accompanying drawings, it is further illustrated the present invention with embodiment.But this embodiment is merely illustrative, this hair
Bright protection domain is not limited by this embodiment.
As shown in Figure 1, when system starts, a preset measurement period is given, concurrent-countercurrent trip is and then measured and gets over
Time calculates time difference and stores；Calculated time difference is stored in a self-defined buffering area and for next
Secondary comparison, calculates flow later；Since measuring second, last measurement data and the data that buffering area is kept in are carried out
Compare, calculate time difference change rate, and feedback adjustment measurement period, the variation of time difference is quickly tracked, convection current is reached
The effect that speed quickly tracks.
A kind of NEW ADAPTIVE measurement method of ultrasonic flowmeter, as shown in Fig. 2, the reality of adaptive measuring cycle methods
Now step is：
Step 1) first, it initializes and gives a measurement period, n time difference sample is measured with the measurement period, respectively
For (Δ t)1、(Δt)2……(Δt)n, customized buffering area is put into the form of array；The value of n according to required precision and
It is fixed, generally take 30-80 to be advisable；
Step 2) then, minimum average B configuration absolute error E is calculated according to formula (5)maa, and according to (Δ t)1、(Δt)i-1With
TcrtValue, time difference change rate is calculated according to formula (1)
Step 3) next, calculating measurement period T next time according to formula (3)nx, and to TnxJudged, with Tmin
And TmaxCompare, if go beyond the scope or 1/2 in range within, to the minimax period again assignment；
Step 4) finally, with TnxNew time difference is carried out for measurement period to measure, and new time difference data is put into
Queue updates buffering area, replaces original legacy data；
Step 4) recalculate Emaa, multiple correlation of laying equal stress on step.
In order to verify the difference of self-adapting measuring method and conventional method, on experimental bench, often used using Q3 flow point as
Test point, temperature are 25 DEG C, and the two methods initialization survey period is 1s, and the buffer length of self-adapting measuring method is set as
48, to being measured respectively under fluid stable state and state of disturbance, analysis comparison is carried out respectively to two methods.
Fig. 3 is in 2.5m3The measurement points line chart of two methods under/h stable states.The secondary time of measuring is set as 30
Second, during this period of time, the measurement period of traditional measurement is fixed, therefore is measured 30 times altogether, and adaptive measuring is steady due to fluid
It is fixed, pendulous frequency is reduced automatically, is measured 16 times altogether, fewer than traditional measurement 14 measurements, from figure 3, it can be seen that two kinds of sides
The time difference registration that method measures is high, and two curves, two curve maximums differ or so 3 nanoseconds, therefore two methods exist
Measurement accuracy under stable state is similar, but adaptive method reduces the workload of CPU, reduces power consumption.
Fig. 4 is flow disturbance state measurement points distribution map.By the control to valve, valve is cut between on off operating mode
It changes, fluid is made to be in state of disturbance, time of measuring is set as 10 seconds, and the pendulous frequency of traditional measurement is 10 times, since flow is disturbed
Dynamic larger, fluid is unstable, and self-adapting measuring method reduces measurement period, increases pendulous frequency, measures 24 times altogether, than passing
Measurement method of uniting measures 14 times more.From fig. 4, it can be seen that the experiment curv difference of two methods is larger, time difference maximum reaches
To 7 nanoseconds or so, the generation of this difference is to lead to measurement process since traditional measurement cannot track fluid state well
In missed the transformation of state, to increase measurement error or even generate measuring error.
Self-adapting measuring method based on the time difference effectively can change adjustment measurement period according to the time difference, compare
Traditional measurement method has a clear superiority, and is in particular in following two points：1, when fluid stable, time difference change rate is low, with
Lower measurement frequency carries out time difference measurement and measures the information such as fluid flow rate and flow, under the premise of ensureing precision,
Reduce power consumption；2, in flow disturbance, time difference change rate is high, improves measurement frequency accurately to track fluid and converts feelings
Condition both can guarantee the real-time tracking of fluid state, also improve the accuracy of measuring, avoid measuring error, reduce meter
Measure error.Therefore, self-adapting measuring method has good meter characteristic.
The description of the above examples is only intended to facilitate the understand of the core idea of the present invention；Meanwhile for the general of this field
Technical staff, according to the thought of the present invention, there will be changes in the specific implementation manner and application range, in conclusion
The content of the present specification should not be construed as limiting the invention.
Claims (4)
1. a kind of NEW ADAPTIVE measurement method of ultrasonic flowmeter, it is characterised in that firstly the need of acquisition time difference sample,
If (Δ t)1、(Δt)2……(Δt)nFor n measurement sample, (Δ t)i、(Δt)i-1For adjacent time difference sample data twice,
(Δt)iTime difference, (the Δ t) measured for thisi-1The time difference measured for the last time；T0For the system initial measurement period,
TnxFor measurement period next time, i.e. this time interval for measuring measurement next time, TcrtFor this measurement period, i.e. last time surveys
Measure the time interval of this measurement；The time difference change rate measured twice is：
Wherein dt is time difference changing value,For time difference change rate.
2. a kind of NEW ADAPTIVE measurement method of ultrasonic flowmeter, it is characterised in that set dtmaxIndicate that time difference variation is maximum
Value, if the absolute value of adjacent time of measuring difference changing value is less than dt twicemax, then flowmeter can continue to continue to measure with the period；
If using this time difference change ratePredict time difference change rate next timeAnd calculate measurement period T next timenx,
It then must satisfy following relational expression
It can obtain：
Using in above formula, maximum rapid fluid tracking cycle is as measurement period next time, i.e.,：
。
3. a kind of NEW ADAPTIVE measurement method of ultrasonic flowmeter, it is characterised in that set EmaaFor the minimum of sample time difference
Mean absolute error, then：
Wherein,For sample (Δ t)1、(Δt)2……(Δt)nAverage value.EmaaCan with the change rate of reflecting time difference, when
EmaaIt is smaller, illustrate that time difference variation is smaller, fluid is more stable；Work as EmaaIt is bigger, illustrate that the time difference changes bigger, flow disturbance
Greatly.It is demonstrated experimentally that using EmaaInstead of dtmax, preferably effect can be obtained, i.e.,：
As can be seen that work as fluid stable, | (Δ t)i-(Δt)i-1| special hour, time difference change rateAlso can very little, by above formula
Obtain measurement period T next timenxProbability Area is infinitely great, the possibility not measured occurs；Opposite, if flow disturbance is big, when
Between poor changing value | (Δ t)i-(Δt)i-1| it can become very big, time difference change rateAlso it can become larger, lead to TnxTend to be infinitely small,
With the frequency measurement being exceedingly fast, increase power consumption, or even entanglement occur.To solve the above-mentioned problems, it needs that the upper of measurement period is arranged
Lower limit.
4. T according to claim 3nx, it is characterised in that set TmaxFor maximum measurement period, TminFor minimum measurement period,
Work as Tnx＜ TminOr Tnx＞ TminWhen, it is believed that exceed present scope, and works as Tnx＜ TminWhen by TnxBecome new Tmin, work as Tnx＞
TminWhen by TnxBecome new Tmin, and calculated as measurement period next time；If Tnx＞ 0.5TminOr Tnx＜ 0.5Tmin
When, by TnxAs new TminOr Tmax；By measuring Tmax-TminIt may determine that the stability of fluid in a period of time.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115950495A (en) * | 2023-02-09 | 2023-04-11 | 青岛鼎信通讯科技有限公司 | Ultrasonic water meter measuring frequency adjusting method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115950495A (en) * | 2023-02-09 | 2023-04-11 | 青岛鼎信通讯科技有限公司 | Ultrasonic water meter measuring frequency adjusting method |
| CN115950495B (en) * | 2023-02-09 | 2023-06-09 | 青岛鼎信通讯科技有限公司 | Ultrasonic water meter measurement frequency adjusting method |
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Application publication date: 20180824 |