CN106092274A - A kind of diaphragm gas meter rapid verification method based on auto-correlation algorithm - Google Patents
A kind of diaphragm gas meter rapid verification method based on auto-correlation algorithm Download PDFInfo
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- CN106092274A CN106092274A CN201610363841.8A CN201610363841A CN106092274A CN 106092274 A CN106092274 A CN 106092274A CN 201610363841 A CN201610363841 A CN 201610363841A CN 106092274 A CN106092274 A CN 106092274A
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- Prior art keywords
- calibrating
- signal
- gas meter
- diaphragm
- diaphragm gas
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
Abstract
The invention discloses a kind of diaphragm gas meter rapid verification method based on auto-correlation algorithm, the method particularly as follows: within a period of time equal interval sampling differential pressure signal gained signal numerical value is done autocorrelation analysis, it is possible to obtain tested table gyration period value thus be calculated revolution volume.Lower-capacity point calibrating time, according to big or middle flow spot check timing gained tested film table revolving body product value as calibrating standard ventilation, by 2～3 revolution volumes of gas time stop calibrating, the calculating ventilation of standard tabular value Yu tested film table obtain the error of indication.The present invention is greatly shortened the calibrating time while ensureing accuracy of measurement, improves the efficiency of diaphragm gas meter calibrating.
Description
Technical field
The present invention relates to diaphragm gas meter error of indication Calibration Technology field, particularly relate to one and pass through auto-correlation algorithm
Obtain diaphragm gas meter revolution volume with the method improving its error testing speed.
Background technology
Diaphragm gas meter is not only the measurement instrument of production development, trade settlement, and saves the energy, raising as a kind of
Economic benefit and the important tool of management level, need active response country " low-carbon (LC) is lived, saved energy and reduce the cost " to call.Therefore, no
Opinion is large, medium-sized enterprises or domestic consumer, and diaphragm gas meter all plays important role.The city that diaphragm gas meter is growing
Field demand, also to constantly improving China's diaphragm gas meter assay device and calibration method, promotes sending out of China's gas energetically
Exhibition is had higher requirement.
The traditional method of detecting gas meter mainly has: bell jar process, wet type table method, piston method and sonic nozzle method etc..But
These methods have a universal shortcoming exactly when carrying out lower-capacity point calibrating the used time the longest.In order to improve diaphragm gas meter
Calibrating efficiency, can by differential pressure method i.e. by detection gas meter, flow meter bellows internal round-trip movement parts motion conditions drive combustion gas
The pressure reduction of table inlet, outlet obtains equivalent revolution volume.During lower-capacity point calibrating, according to big or middle flow spot check timing gained
The revolving body product value of tested film table, as the standard ventilation of calibrating, stops calibrating during by 2～3 revolution volumes of gas, by
Standard tabular value obtains the error of indication with the calculating ventilation of tested film table.
The method of currently acquired diaphragm gas meter revolution volume is extremely limited, due to returning of differential pressure signal and diaphragm gas meter
Transhipment is dynamic has good dependency, and has had differential pressure biography at existing sonic nozzle standard calibrating device inlet, outlet
Sensor, uses the cycle of the differential pressure signal that the method for autocorrelation analysis draws to represent the revolution week of gas meter, flow meter again after can directly reading
Phase.Set forth herein a kind of revolution volume by auto-correlation algorithm acquisition diaphragm gas meter thus improve lower-capacity point calibrating speed
Method.
Summary of the invention
The present invention, in order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of membrane type based on auto-correlation algorithm
Gas meter, flow meter rapid verification method.
Correlation analysis is a kind of conventional voice time domain wave analyzing device, and it is defined by correlation function.Correlation function
Can be used to the time domain similarity measuring between signal.If two signals are entirely different, correlation function is close to zero；If two letters
Number waveform is identical, peak value will occurs at place advanced, delayed.Auto-correlation function can be used for studying signal itself, same such as waveform
Step property, periodicity etc..
Cross-correlation function for energy signal x (n) He y (n) is defined as:Its
Middle m, n are centrifugal pumps, represent m, the n moment.rxyM (), in the value in m moment, is equal to be remained stationary as by x (n) and y (n) moves to right m
Sampling period, then, two sampled sequences are multiplied in all corresponding moment value, then add and.If y (n)=x (n), then the most fixed
The cross-correlation function of justice becomes auto-correlation function:Cross-correlation function represents signal y
Waveform after (n) time delay m and the similarity degree of signal x (n) waveform.And auto-correlation function represent the waveform of signal x (n) and self
The similarity degree of the waveform x (n+m) after the m moment.
For energy signalI.e. rxx(0) equal to the energy of signal x (n) self.According to
The feature of power signal, rxx(0) will tend to infinitely great.Therefore, the auto-correlation function for power signal is defined as:If x (n) is periodic signal (periodic signal is power signal), its cycle is T,
For the auto-correlation function of x (n),
Therefore, the auto-correlation function of periodic signal is also the cycle, and cycle and original signal same cycle.
Owing to the gyration of differential pressure signal Yu diaphragm gas meter has good dependency, can be with autocorrelation analysis
The cycle of the differential pressure signal that method draws represents the gyration period of gas meter, flow meter, thus calculates revolution volume and be applied to diaphragm gas
In the rapid verification method of Watch Error.It specifically comprises the following steps that
1, record the differential pressure signal of diaphragm gas meter air inlet and gas outlet with a differential pressure pick-up, this pressure differential can
To promote the diaphragm of diaphragm gas meter measuring indoor sport, and valve actuating mechanism is driven to coordinate distribution so that diaphragm
Motion can be the most reciprocal carrying out.
2, the differential pressure signal obtaining step 1 carries out signal condition and A/D conversion is passed to a differential amplifier circuit
Again by a programmable amplifying circuit to reach the purpose of signal condition, then it is passed to an A/D module to complete differential pressure letter
Number to the conversion of voltage signal.
3, external data acquisition processing module, first samples to the voltage signal obtained by step 2, obtains discrete adopting
Sample value x (n) (in order to ensure that signal analysis must correctly is fulfilled for the sampling period of sampling thereom states).
4, voltage signal x (n) obtaining step 3 carries out autocorrelation analysis process.Auto-correlation function computing formula is:The waveform of available signal x (n) is with self waveform x's (n+m) after the m moment
Similarity degree, can draw r through emulationxxM () figure presents periodically, and at m=0, T, 2T, peak value occur, thus obtain
Go out the periodic signal T lain in x (n).
5, T gyration period by obtaining in step 4 is calculated revolution volume and to carry out diaphragm gas Watch Error quick
Calibrating: flow spot check timing, according to big or middle flow spot check timing gained tested film table revolving body product value as calibrating mark
Quasi-ventilation, stops calibrating during by 2～3 revolution volumes of gas, the calculating ventilation of standard tabular value with tested film table obtains
To the error of indication.
The technical solution adopted in the present invention is:
By above-mentioned principle, by external data acquisition processing module, within a period of time, equal interval sampling differential pressure signal is also
Gained signal numerical value is done autocorrelation analysis, it is possible to obtain tested table gyration period value thus be calculated revolution volume.Little
The timing of flow spot check, ventilates as the standard examined and determine according to the revolving body product value of big or middle flow spot check timing gained tested film table
Amount, stops calibrating during by 2～3 revolution volumes of gas, the calculating ventilation of standard tabular value Yu tested film table obtains indicating value
Error.
Compared with prior art, the invention has the beneficial effects as follows: in existing diaphragm gas meter indicating value based on sonic nozzle
On the basis of error verification device, can effectively be obtained the equivalent revolution volume of diaphragm gas meter by auto-correlation algorithm, by rill
Amount point calibrating volume is turned around by original least count dish, and (domestic table is usually 10dm3) it is reduced to a revolution volume (family
It is usually 0.9 1.2dm with table3), while ensureing accuracy of measurement, calibrating time is greatly shortened, improves membrane type combustion
The efficiency of gas meter calibrating.Correlation function mathematical formulae is simple, even if using low side single-chip microcomputer can also realize function algorithm, this is
Reduce system cost and provide favourable condition.
Accompanying drawing explanation
Fig. 1 is: large-capacity point differential pressure pick-up output figure；
Fig. 2 is: differential pressure signal x (n) does autocorrelation analysis figure.
Detailed description of the invention
The invention provides a kind of diaphragm gas meter error of indication calibration method.Below in conjunction with the accompanying drawings and embodiment to this
Invention further illustrates.Embodiment is that the present invention illustrates, and not limits this invention.
The revolution volume of diaphragm gas meter is the most basic unit of diaphragm gas meter metering.Want to shorten diaphragm gas meter
The lower-capacity point calibrating time, can realize by reducing the ventilation of minimum discharge point, i.e. the calibrating ventilation of this point be set
It is set to equivalent revolution volume.
Double chronometry is used to obtain the revolution volume of gas meter, flow meter: with a photoelectric sensor detection membrane type gas meter head
Reading digit wheel signal, then the differential pressure of air inlet and gas outlet is recorded with a differential pressure pick-up, this pressure differential can promote
The diaphragm of diaphragm gas meter is in metering indoor sport, and drives valve actuating mechanism to coordinate distribution so that the motion energy of diaphragm
The most reciprocal enough carrying out.
Before photoelectric sensor being fixed on gas meter, flow meter during calibrating, the reflecting sign on least count dish on tested table can be detected
Know.So when the counting character wheel of gas meter head often forwards at mark one time to, it is (right that photoelectric sensor will export a pulse
10dm is generally corresponded in Household diaphragm gas meter3).Gather the air inlet of existing sonic nozzle assay device, the difference of gas outlet
The differential pressure signal of pressure sensor output, the voltage that during large-capacity point, differential pressure pick-up output signal is corresponding is as shown in Figure 1.Pass through
With actual test, theory analysis all shows that differential pressure signal has good dependency, Ke Yiyong with the gyration of diaphragm gas meter
The cycle of the differential pressure signal that the method for autocorrelation analysis draws represents the gyration period of gas meter, flow meter.
First the differential pressure signal of acquisition is carried out signal condition and A/D conversion, i.e. first passes through differential amplifier circuit, then pass through
Programmable amplifying circuit, uses digital programmable gain instrumentation amplifier, can directly control to put according to signal peak by GPIO mouth
Big multiple.It is passed to A/D module again be connected by parallel interface mode with processor.A/D module BUSY pin is received
The external interrupt pin of STM32 is also configured to trailing edge and triggers, and thus can read data after converting in time.
Auto-correlation function according to periodic signal is also the cycle, and cycle and original signal are with cycle principle, by external
Digital sampling and processing, first to the above-mentioned signal sampling converted through signal condition and A/D, obtains dis-crete sample values x
(n) (in order to ensure that signal analysis must correctly is fulfilled for the sampling period of sampling thereom states).Then x (n) is asked auto-correlation letter
Number, as shown in Figure 2, it can be deduced that rxxM () figure presents periodically, and at m=0, T, 2T, peak value occur, thus disclose
Lie in the periodic signal in x (n).By being calculated revolution volume.
When flow point big or middle is examined and determine, industrial computer controls data collecting system and carries out data acquisition, by nozzle stagnation temperature
Degree, pressure obtain mass flow, then are calculated gas at effusion meter by ambient temperature, atmospheric pressure, effusion meter temperature, pressure
Density, thus obtain gas actual volume flow at effusion meter, i.e. standard volume flow, the stream then recorded with effusion meter
Amount contrasts, and draws verification result according to calibrating rule, calculates simultaneously and preserve the revolving body product value of tested table；Lower-capacity point
During calibrating, according to the revolving body product value of big or middle flow spot check timing gained tested film table as the standard ventilation of calibrating, logical
Stop calibrating when crossing 2～3 revolution volumes of gas, the calculating ventilation of standard tabular value Yu tested film table obtain the error of indication also
Do qualified judgement.
Claims (1)
1. a diaphragm gas meter rapid verification method based on auto-correlation algorithm, it is characterised in that: the method specifically include with
Lower step:
Step one: record the differential pressure signal of diaphragm gas meter air inlet and gas outlet, this pressure differential with a differential pressure pick-up
The diaphragm that can promote diaphragm gas meter is measuring indoor sport, and drives valve actuating mechanism to coordinate distribution so that diaphragm
Motion can be the most reciprocal carrying out；
Step 2: the differential pressure signal obtaining step one carries out signal condition and A/D conversion is passed to a differential amplification electricity
Road again by a programmable amplifying circuit to reach the purpose of signal condition, then be passed to an A/D module to complete differential pressure
Signal is to the conversion of voltage signal；
Step 3: external data acquisition processing module, first samples to the voltage signal obtained by step 2, obtains discrete
Sampled value x (n)；
Step 4: voltage signal x (n) obtaining step 3 carries out autocorrelation analysis process；Auto-correlation function computing formula is:The waveform of available signal x (n) is with self waveform x's (n+m) after the m moment
Similarity degree, can draw r through emulationxxM () figure presents periodically, and at m=0, T, 2T, peak value occur, thus obtain
Go out the periodic signal T lain in x (n)；
Step 5: be calculated revolution volume by T gyration period obtained in step 4 and to carry out diaphragm gas Watch Error fast
Speed calibrating: flow spot check timing, according to big or middle flow spot check timing gained tested film table revolving body product value as calibrating
Standard ventilation, stops calibrating, by the calculating ventilation of standard tabular value Yu tested film table during by 2～3 revolution volumes of gas
Obtain the error of indication.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610363841.8A CN106092274A (en) | 2016-05-27 | 2016-05-27 | A kind of diaphragm gas meter rapid verification method based on auto-correlation algorithm |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610363841.8A CN106092274A (en) | 2016-05-27 | 2016-05-27 | A kind of diaphragm gas meter rapid verification method based on auto-correlation algorithm |
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| CN106092274A true CN106092274A (en) | 2016-11-09 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108458765A (en) * | 2018-03-29 | 2018-08-28 | 威海拙诚燃气安全设备有限公司 | A kind of gas metering method |
| CN108775934A (en) * | 2018-07-20 | 2018-11-09 | 山东大学 | The indirect metering method of digitlization gas flow based on AMFD algorithms |
| CN108801373A (en) * | 2018-07-20 | 2018-11-13 | 山东大学 | The indirect metering method of gas flow based on gas pressure integral of pulse shape periodicity extraction algorithm |
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| CN201463953U (en) * | 2009-07-29 | 2010-05-12 | 重庆前卫仪表厂 | Film type gas meter with dramatic turning volume |
| CN103278220A (en) * | 2013-06-05 | 2013-09-04 | 中国计量学院 | Method for rapidly verifying intrinsic errors of membrane type gas meter and device thereof |
| CN203376035U (en) * | 2013-06-20 | 2014-01-01 | 浙江蓝宝石仪表科技有限公司 | Device for detecting fundamental errors of industrial membrane type gas meter |
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2016
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201463953U (en) * | 2009-07-29 | 2010-05-12 | 重庆前卫仪表厂 | Film type gas meter with dramatic turning volume |
| CN103278220A (en) * | 2013-06-05 | 2013-09-04 | 中国计量学院 | Method for rapidly verifying intrinsic errors of membrane type gas meter and device thereof |
| CN203376035U (en) * | 2013-06-20 | 2014-01-01 | 浙江蓝宝石仪表科技有限公司 | Device for detecting fundamental errors of industrial membrane type gas meter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108458765A (en) * | 2018-03-29 | 2018-08-28 | 威海拙诚燃气安全设备有限公司 | A kind of gas metering method |
| CN108775934A (en) * | 2018-07-20 | 2018-11-09 | 山东大学 | The indirect metering method of digitlization gas flow based on AMFD algorithms |
| CN108801373A (en) * | 2018-07-20 | 2018-11-13 | 山东大学 | The indirect metering method of gas flow based on gas pressure integral of pulse shape periodicity extraction algorithm |
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Application publication date: 20161109 |
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