CN1220062C - Detecting method of current meter and its detection mounting equipment - Google Patents
Detecting method of current meter and its detection mounting equipment Download PDFInfo
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- CN1220062C CN1220062C CN 03113096 CN03113096A CN1220062C CN 1220062 C CN1220062 C CN 1220062C CN 03113096 CN03113096 CN 03113096 CN 03113096 A CN03113096 A CN 03113096A CN 1220062 C CN1220062 C CN 1220062C
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Abstract
On the basis of counting a large amount of experimental data and aiming at problems in regular groove detection method, the present invention simplifies and optimizes the key problems in technology of the detection. A method for detecting current meters comprises the following steps: friction resistance moment in a current meter is detected by a moment instrument; the additional coefficient standard C#-[B] value of a detection formula of the detected current meter is adopted as the intercept of the detection formula; an optimal speed V#-[i] is regulated and selected; the detected current meter is arranged on the lower part of a measuring rod and is fixed to a detection vehicle; the axial direction of the regulated instrument is detected visually by a laser direction finder; the speed V#-[i] of the detection vehicle, the number R#-[i] of output signals of the instrument and corresponding time T#-[i] are detected; the rotation speed n#-[i] of the current meter is calculated; the other point coordinate of the detection formula is determined; the slope value K#-[1] of the detection formula is calculated. The present invention simplifies a detection program and optimizes a speed point, the fluid dynamics performance of the measuring rod and the orientating function of instrument installation, so water undulation in detection, detection workload and staff and labor intensity are reduced.
Description
Technical field
The present invention relates to a kind of calibration method of rivers hydrologic survey current meter, and the employed instrument calibrating of this method erecting equipment.
Background technology
Current meter is the important instrument of rivers hydrologic survey, in order to guarantee the accurate of instrument metering, need detect, examine and determine current meter.Existing current meter calibration method of China and erecting equipment are to carry out according to Ministry of Water Resources's standard " calibrating of SD145 straight line open channel transfer minor current meter " relevant regulations.
1. current meter is examined and determine erecting equipment
Current meter calibrating mounting means hangs for the measuring staff formula, most of installation method that adopts is, current meter is fixed on the measuring staff end portion earlier, connect transmission cable, with the instrument predetermined measuring point depth of water place of straight line open channel tank of submerging, then, the measuring staff middle part is bearing in the sill supporting sleeve, top is fixed in the axle sleeve hole of entablature, and the visual instrument axis is parallel with the axis of straight line open channel, tightens up with screw at last.The measuring staff that current meter is installed normally, it partly is rectangular cross section that current meter is installed in the lower end; It is elliptical section that water section is gone in the centre; The wiring of current meter signal output cable is along the measuring staff outside.
2. current meter calibration method
The current meter calibration method is in the straight line open channel, use the relative motion of object principle, promptly the current that move in the rivers are assumed to be impounded body in the straight line open channel of laboratory, and be installed in the water fixed current meter on the point position during flow measurement, then conversely it is installed on the measuring staff of calibrating car, places on the static water body point position of straight line open channel.When calibrating, along orbital motion, the current meter that is fixed on the measuring staff is promptly done relative motion with hydrostatic to the calibrating car with a series of speed.Thereby can detect a series of speed V
i, and in corresponding time T
iThe revolution R of interior current meter
i, the instrument rotation speed n is:
n＝R/T (1)
According to the SD145 standard code, in current meter tested the speed range ability, from about 0.10m/s low speed to about 4～5m/s at a high speed, evenly laying was no less than 12 speed points, according to the data of above-mentioned detection and calculating, can get one group of experiment measuring point N
i(n
i, V
i), can obtain the current meter calibration equation by data processing in view of the above:
V＝Kn+C (2)
K is a current meter calibration equation principal parameter in the formula, also claims rotor waterpower pitch; C is an additional coefficient.
3. gauging error
By national standard " GB/T1126 rotating element current meter " regulation, rotary propeller type and cup-type current meter calibration equation error be not more than respectively ± and 1.8% and ± 2.0%.Its new product of the instrument of above-mentioned two kinds of patterns dispatch from the factory calibrating company standard and old instrument maintenance standard verification be respectively ± 1.2% and ± 1.5%.
4. straight line open channel current meter is examined and determine the problem that exists in erecting equipment and the calibration method at present
Many and concentrate in task, and under the situation it is pressed for time, above-mentioned current meter examines and determine that following problem just looms large in erecting equipment and the calibration method.
(1) water fluctuation is big
The measuring staff section of current meter calibrating erecting equipment is ellipse and rectangle, and hydrodynamic characteristics is relatively poor, and choke water the measuring staff front portion, and rear portion vortex, current meter signal-transmitting cable hang in the water, the disturbance water body, and therefore, the water fluctuation that causes during calibrating is big.
(2) water fluctuation makes the calibrating achievement have certain error
In each driving verification process, when current meter and impounded body were done relative motion, instrument itself, installation measuring staff and signal-transmitting cable etc. evoked water fluctuation, produce flow velocity increment ± Δ V, and it strengthens with the increase of calibrating speed and number of times.Cell wall repeatedly reflects and superposition water fluctuation simultaneously, and speed increment ± Δ V value is increased, and the direction complexity.At this moment affacting the epitrochanterian actual speed V of current meter, is not the calibrating vehicle speed V that above-mentioned calibrating principle is supposed
i, but V=V
i± Δ V.Because the desirable condition of the water body absolute rest that the hydrostatic reference operating condition of groove detecting method in calibrating can not meet in theory fully to be supposed, but calibrating vehicle speed V
iTherefore standard input V as the instrument calibrating, is certainly existing certain gauging error in the calibrating.
(3) measuring staff rigidity is poor
For reducing the water fluctuation degree, the measuring staff cross dimensions is all less than normal, and again because of streamlined not good enough, when examining and determine at a high speed, measuring staff rigidity is poor, and instrument produces skew, influences instrument and runs well.
(4) instrument is installed directed
Instrument shaft is to should be parallel with straight line open channel center line during calibrating, orientation is installed in instrument calibrating does not at present have tangible datum line as reference, all is with worker's experience visual instrument axis and open channel center line almost parallel, therefore, its accuracy is relatively poor, and each one vision has certain difference.
(5) production efficiency is low
The SD145 standard code:
1) the measuring point number is no less than 12.
2) the hydrostatic time long, in low speed when calibrating,, it is static relatively that the water surface should keep; When examining and determine at a high speed, also should there be the suitable hydrostatic time between every measuring point.
3), limited the raising of throughput rate in view of afore mentioned rules.
(6) calibrating speed height
1) cause that water fluctuation is big, the flow velocity increment increases, and causes the hydrostatic time lengthening of low speed calibrating next time.
2) owing to the limited length of straight line open channel, stopping element is short, and the worker is for fearing car accident, stress when examining and determine at a high speed.
3) calibrating overall height speed operation mechanical wear is big, need often safeguard, overhaul, in case car accident.
(7) calibrating operation cost height
Because the calibrating measuring point is many, program is numerous and diverse, the maintenance of equipment task is heavy, the hydrostatic time is long, the staff is many, therefore, the calibrating running cost is big, the cost height.
Summary of the invention
The present invention will provide a kind of new current meter calibration method, and the employed new calibrating erecting equipment of this method, and new technical scheme will be simplified the program and the step of detection method in the prior art significantly, improve detection efficiency, improve its condition of work.Specifically, technical matters to be solved by this invention has:
1. water fluctuation in the minimizing verification process to reduce speed increment, is avoided producing bigger error;
2. optimize measuring staff flow dynamics and instrument orientating function is installed;
3. simplify calibrating procedure to reduce workload, reach the purpose of increasing efficiency by downsizing payrolls;
4. reduce the operation management expense, promptly reduce the calibrating cost;
5. simplify the calibration equation calculation procedure;
6. alleviate worker's labour intensity, and mental burden.
For addressing the above problem, the present invention is based on a large amount of experiments of theoretical direction, and the practical experience of summary China over more than 50 year: current meter manufacturing accuracy, instrument performance, and current meter calibration equipment, technology etc. all improve a lot, more than 10 ten thousand instruments that statistics accumulative total is produced, hundreds of thousands sortie calibrating data shows that calibration equation slope near linear is very bright and clear altogether.In view of the above, to overhauling the calibrating of old instrument, can simplify.At the above-mentioned a series of problems in the conventional groove detecting method, relevant major technique key in traditional current meter calibration method is simplified, optimized.The calibration method of rivers hydrologic survey current meter provided by the invention may further comprise the steps:
(1) quotes calibration equation additional coefficient standard value C in the tested current meter product technology standard
B
(2) determine experimental formula low speed sit up straight punctuate (0, C
B);
(3) according to calibrating groove characteristic analysis-by-synthesis, determine favor speed V
i
(4) detect the current meter inner friction moment with moment instrument;
(5) detected current meter is installed in the measuring staff bottom;
(6) current meter is put in the water gently, measuring staff is installed on the calibrating car, make instrument be in predetermined depth of water place;
(7) axial orientation of adjustment instrument;
(8) detect the speed V that examines and determine car
i, instrument output signal count R
iAnd last T accordingly
i
(9) press the rotation speed n that formula (1) is calculated current meter
i
(10) by following experimental formula (3) calculating K
1Value.
Use equipment of the prior art, also can finish the calibrating of current meter according to method of the present invention, and can partly reach the purpose of invention, but can not finish whole task of the present invention, so the present invention also provides above method employed new calibrating erecting equipment.Current meter calibrating erecting equipment comprises: on the calibrating car current meter is installed measuring staff and signal cable are installed, it is characterized in that: the cross section of measuring staff is streamlined.The prioritization scheme of this equipment has: (1) signal-transmitting cable is arranged on measuring staff inside; (2) be provided with the laser orientation device, this laser orientation device is fixed on the inspection vehicle, and its laser beam transmit direction is a vertical line, and this vertical line is parallel with the measuring staff center line, and the plane of both formations and the axially parallel of straight line open channel.When using calibrating erecting equipment of the present invention, calibration method also can have following prioritization scheme:
Another purpose to calibrating is the sensitivity of calibrating instrument, i.e. instrument starting rotating speed V
0, examination instrument low-speed performance, as long as this use frictional resistance in the moment instrument detecting instrument.
The present invention and traditional calibration method at first are to have simplified the calibrating measuring point relatively, only need examine and determine N time under a velocity stage, and according to calibrating groove characteristic, under good situation, the calibrating car only need come and go each calibrating of driving once, can obtain examining and determine achievement.That is: a check point only is set in the calibrating procedure.The preferred speed point speed of institute is lower, and the measuring staff that the current meter calibrating is installed is streamlined, signal-transmitting cable cloth is made as built-in, current meter is installed axis orientation basis of reference, survey method with device, so just, reduced the influence of water fluctuation, the required time of hydrostatic is greatly reduced the calibrating achievement; The instrument installation direction is comparatively accurate, thereby, help examining and determine the quality of achievement; From the operation management angle, calibrating, calculation procedure letter, workload is little, work efficiency is high, light labor intensity, staff are few, the calibrating cost is low.
Owing to the present invention relates to the standardization issue of instrument, met existing technical standard fully so need to discuss calibration method of the present invention.Determine that it is according to following steps that the present invention meets existing technical standard:
1. according to current meter performance and calibration equipment, tank characteristic, by analysis-by-synthesis, preferred best calibrating velocity stage:
(1) when examining and determine flow velocity less than 0.3m/s low speed, external interference such as water fluctuation, calibrating car vibration etc. very easily influences the operate as normal of instrument, and gauging error is bigger.
(2) calibrating car travelling speed rate of change δ, when vehicle velocity V≤0.5m/s low speed, δ≤0.8%～2.0%, and normal with the vibration of certain frequency and the vibrations of intermittence in calibrating car operational process, very unfavorable to current meter in the operate as normal of low regime; When V 〉=0.5m/s middle and high when speed, calibrating car travelling speed good stability, the δ value is little one times during than slow running.The water flow dynamic energy that the current meter rotor obtains is bigger, and flow speed stability, reliable operation.
(3) at a high speed calibrating, water fluctuation is big, the flow velocity increment is big, through cell wall repeatedly reflect, superposition, the direction complexity, therefore, more than V 〉=3m/s, calibrating achievement error may be bigger.
(4) examine and determine the huge fluctuation of the water body that causes at a high speed and need the very long hydrostatic time, influence production efficiency.
(5) calibrating overall height speed operation, equipment attrition, maintenance increase operational and administrative expenses.
(6) high speed traveling calibrating driving worker spirit is comparatively nervous.
According to above-mentioned analysis, preferred optimum velocity level should be abandoned upper and lower end speed, and is advisable with middling speed.According to the tank characteristic, the cell body size and the unrestrained equipment performance that disappears can be determined by experiment.Test calibrating factually and show, general scale calibrating groove with middling speed on the lower side end speed be good, for large-scale calibrating groove, and have the unrestrained measure that well disappears, also can be high slightly, to improve work efficiency.Preferred speed point coordinate is (n
1i, V
1i).
2. optimize calibration equation low side anchor point
The intersection point C of extensions and ordinate V axle is an instrument calibration equation additional coefficient under the straight-line equation, also is one of principal parameter of low-speed performance, it and instrumental sensitivity, i.e. and instrument internal resistance has substantial connection.Therefore, frictional resistance is up to standard in the instrument that detects, and can adopt standard C
BValue.In view of the above, can determine C according to tested current meter technical target of the product
BValue.So, preferred calibration equation low speed end anchor point coordinate be (0, C
B).
3. experimental formula
By above-mentioned analysis, optimal speed point and anchor point can get experimental formula:
4. optimize the current meter calibrating measuring staff is installed
According to Hydrodynamics Theory, be streamlined to the measuring staff section optimization, and the current meter signal-transmitting cable changed into built-in, improving fluidised form, reduce water resistance and water fluctuation.
5. optimize the axial installation and locating method of current meter
The worker is axially consistent with the calibration tank axis with naked eyes estimations current meter, and strict theory should be the travel empirical method of track of calibrating car, is optimized for device survey datum target orientation.
Description of drawings
Fig. 1 is calibrating car and current meter calibrating erecting equipment structural representation;
Fig. 2 installs the measuring staff structural representation for the current meter calibrating;
Fig. 3 is a measuring staff cross section enlarged diagram.
Embodiment
1. current meter calibrating erecting equipment of the present invention
Shown in Figure 1 current meter calibrating erecting equipment structure comprises: measuring staff 4, measuring staff low-drag cowl 11, signal-transmitting cable 7, entablature 3, fixed cover 5, gib screw 6, sill 8, supporting sleeve 10, fulcrum post 9, laser orientation device 2, current meter 12, calibrating car 1.Entablature 3 and sill 8 are separately fixed on the upper and lower support of calibrating car 1 rear vehicle, testedly decide the bottom that current meter 12 is installed in measuring staff 4, fulcrum post 9 is contained on the cylinder at measuring staff 4 middle parts, below it is low slightly, a flat section is arranged, the Kong Youyi notch of supporting sleeve 10, the flat section of measuring staff 4 is put into from notch, and its cylindrical and supporting sleeve 10 holes match, fulcrum post 9 promptly is bearing on the upper surface of supporting sleeve 10, and Fig. 2 installs A to zoomed-in view for Fig. 1 measuring staff.The top cylindrical sleeve of measuring staff 4 is in fixed cover 5, laser orientation device 2 is fixed on the entablature 3, the light beam plumb line of laser is parallel with the center line of measuring staff 4, and both constitute plane and straight line open channel axially parallel, when tested decide current meter adjustment direction after, the gib screw 6 on the promptly available fixed cover 5 is fixing with measuring staff 4.
Figure 3 shows that the cutaway view Amplified image of Fig. 1 at the I-I section, its structure is measuring staff 4, measuring staff low-drag cowl 11, signal-transmitting cable 7, rivet 13.Measuring staff 4 structure collectivities require: 1. enough rigidity; 2. streamlined section preferably; 3. construction easily; 4. in light weight; 5. easy to loading and unloading.
In view of the above, measuring staff 4 is made by the good material of bending strength, and is fairshaped main part with measuring staff 4, and its section length is 2/3 of streamlined section longitudinal axis L, and measuring staff low-drag cowl 11 length are L/3.Respectively there is a small stair both sides, rear portion of measuring staff 4 sections, and 11 embeddings of measuring staff low-drag cowl are used rivet 13 riveteds thereon.For ease of construction, the streamlined section size is to simplify the about R3mm of front end roundlet arc by the symmetry machine wing section curve of standard, the about R40mm of circular arc broad in the middle, the back is smoothly to link to each other near straight line, and the wing chord length L is 6 times of the thick B of the wing, and maximum ga(u)ge Bmax is from front end 1/3 place.
2. current meter calibration method of the present invention
Extract 4 of certain commonly used model current meters of present national discharge site as the indefiniteness case study on implementation, calibration method and feasibility are described.
(1) № 0101 instrument verification step is as follows:
1) quotes calibration equation additional coefficient standard value in the tested current meter technical target of the product, this model current meter C
B=0.0070m/s.
2) determine experimental formula (3) low side anchor point coordinate (0, C
B).
3) according to certain calibrating groove characteristic analysis-by-synthesis, determine favor speed V
i=0.9m/s.
4) detect the current meter inner friction moment with moment instrument.
5) current meter 12 that will be examined and determine is installed in measuring staff 4 bottoms.
6) put into current meter 12 in the tank water lightly, make the flat section at measuring staff 4 middle parts put the notch of supporting sleeve 10 into, measuring staff 4 is fallen, vertically up carry again, the cylinder on its top is packed in the hole of fixed cover 5, then, transfer make its middle part cylindrical sleeve in the hole of supporting sleeve 10, and fulcrum post 9 is shelved on its upper surface, and current meter 12 is in predetermined depth of water place, connects the input end of segment count simultaneously with signal-transmitting cable 7.
7) axial location of the tested current meter 12 of adjustment is positioned under the light beam of laser orientation device 3 its oar head, tightens up gib screw 6 then.
8) start the calibrating car, accelerate to and preset favor speed V
1i=0.9m/s.
9) enter stable section, detection signal is counted R=200r, the about 50s of time T, and when R reached predetermined number of revolutions, counter showed actual measurement flow velocity V automatically
1iEtc. parameter, as subordinate list 1, sequence number 1 shows: actual speed V
1=0.8991m/s, n
1=3.6485r/s, K
1=0.2445m.Standard value with the conventional calibrating of this instrument, calculating
Identical.
10) calibrating car about 10m that continues to advance, then, the current meter that will be examined and determine 180 ° of directions of turning round lentamente.
11) continue by the calibrating of above-mentioned (9) to (10) step, sequence number 2 shows: actual speed V
1=0.8989m/s, rotation speed n
1=3.6559r/s, K
1=0.2440m.With the K that examines and determine for the first time
1Value deviation only 0.20% with the conventional calibrating of this instrument, standard value deviations=0.20% that calculates, satisfies technical requirement.With 2 K
1Value is average as the calibrating achievement.This instrument calibrating finishes.
12) will examine and determine car and open, and unload instrument, and carefully and lentamente instrument is left the water to calibrating groove originating terminal.
13) next frame current meter is installed, is undertaken, can continuously examine and determine by above-mentioned steps.
3. feasibility checking
(1) repeatability calibrating
Feasibility with № 101, № 102, № 103, № 104 instruments repeatability calibrating achievement checking current meter calibration method of the present invention.Every instrument comes and goes by above-mentioned verification step (9)～(10) to be examined and determine 9 times, and totally 18 sorties are examined and determine achievement, shown in subordinate list 1～4.K
1Value and this standard of instruments value
Deviation luffing peace is respectively: 0.00%～0.74%, 0.00%～0.74%, 0.00%～0.47%, 0.21%～0.49% and 0.27,0.26,0.16,0.29%.All meet the requirements.Overall average is 0.24%.
(2) calculate with the inventive method according to a conventional method with the conventional calibrating data of current meter
1) calibration equation K value deviation
Carry out the repeated experiment calibrating with above-mentioned 4 instruments by equipment, the method for SD145 standard code.For ease of analysis, the comparison of data, the condition of every its each calibrating of instrument is all identical.Experiment calibrating mode is: every instrument is divided into time calibrating of 8 groups, and each group time is generally 3h in short time, repeat continuously to examine and determine 3 times, after a period of time, examines and determine the 2nd group time again, and it is inferior to have examined 8 groups successively by this, totally 24 sorties.Least square method with existing technology routine is calculated every the every sortie calibration equation of instrument COEFFICIENT K respectively
0, C
0Value, and the average of adding up every instrument 24 sorties respectively
Use the standard value of the inventive method experiment calibrating achievement as this instrument of evaluation with this.Utilize the routine of every calibrating of above-mentioned 4 instruments 24 sorties to examine and determine same data simultaneously, calculate by the inventive method: in speed series, get V
1A speed point in=0.8～1.0m/s scope; These 4 instruments are detected under the situation up to standard at inner friction moment, adopt calibration equation additional coefficient standard value C
BKnown this instrument product technology standard C
B=0.0070m/s; Calculate the K of the each calibrating of each instrument respectively by formula (3)
1Value.See attached list 5～8.
With conventional least square method and the comparative statistics of the inventive method calculating achievement shown in table 1,2.
K value and standard value that two kinds of methods of table 1 are calculated one by one
Deviation and phase mutual deviation
By table 1 as seen, two kinds of achievements that method is calculated one by one, its luffing, average are all much smaller than this standard of instruments technical indicator, and deviation is also very little between the achievement of two kinds of method calculating, and 4 instrument overall averages only are 0.15%, can ignore fully.
The average that above-mentioned 4 instruments calculate with conventional least square method and the inventive method respectively
And deviations is as shown in table 2.The achievement that two kinds of methods are calculated is very approaching, between deviations=-0.04%～-0.12%, average out to-0.06%.
Average and the deviation of the calibration equation K value that two kinds of methods of table 2 are calculated
2) calibration equation C value deviation
Calibration equation C average C with the conventional calibrating of above-mentioned 4 instruments, calculating
0Be standard, check the inventive method and adopt standard value C
BThe deviation of=0.0070m/s, as shown in table 3.
Table 3 the inventive method adopts standard value C
BWith conventional least square method C
0Deviation
| C mean value computation method and deviation | Instrument number № | Absolute value is average | |||
| 101 | 102 | 103 | 104 | ||
| Conventional least square method C 0 m/s | 0.0069 | 0.0071 | 0.0071 | 0.0077 | 0.0072 |
| Standard value deviations % of the present invention | 1.4 | -1.4 | 1.4 | 9.1 | 3.3 |
By table 3 as seen, the inventive method adopts standard value C
B, itself and the average C that examines and determine, calculates by the frame instrument
0Very approaching, mean deviation only is 3.3%.
3) calibrating achievement discreteness
The achievement discreteness is represented its average relative scatter absolute value δ with the achievement of every each time of instrument calibrating.More than 4 same calibration methods of instrument and data, adopt conventional least square method and the inventive method result of calculation, the achievement discreteness is as shown in table 4.
Table 4 the inventive method and conventional least square method calculating achievement discreteness
| The calibrating coefficient | Computing method | Instrument number № | On average | ||||
| 101 | 102 | 103 | 104 | ||||
| K | Least square method δ K0 ％ | 0.21 | 0.15 | 0.22 | 0.21 | 0.20 | |
| The inventive method δ K1 ％ | 0.29 | 0.18 | 0.16 | 0.20 | 0.21 | ||
| C | Least square method | δ C0 ％ | 14.2 | 12.1 | 19.9 | 9.3 | 13.9 |
| δ C0max ％ | 42.0 | 38.0 | 39.4 | 22.1 | 35.4 | ||
As seen from the above table, the K value discreteness that conventional least square method and the inventive method are calculated with same calibrating data is consistent basically, on average is respectively 0.20% and 0.21%; And C value conventional method is bigger by the discreteness of frame calibrating, average out to 13.9%, maximum average out to 35.4%; And C of the present invention
BThe value discreteness is the deviation of the standard value shown in the table 3 and this instrument average just, on average and maximum be 3.3%.
4) current meter is open-air than surveying calibrating
Its principle of the inventive method also can be applicable to the open-air ratio of current meter and surveys calibrating, and different is: 1. than surveying frame replacement calibrating measuring staff is installed with current meter; 2. standard input speed V
iBe to use the measured flow velocity of the reference current metre that is installed together side by side with tested current meter to replace the calibrating car speed of travelling; 3. for eliminating the difference of natural flow turbulence and cross direction profiles, it is inferior to increase survey, and is surveying a time half instrument transposition.
Undertaken than surveying calibrating, verification result: K by 9 discharge sites of 20 instruments in large, medium and small river, the whole nation
1Value and conventional calibration tank calibrating achievement deviation average out to 0.53% meet China's " hydrologic survey standard " requirement.
Therefore, discharge site adopts current meter calibration method of the present invention, and its principle is feasible, so also ought belong to protection scope of the present invention.
(3) experiment calibrating checking conclusion
More than experiment calibrating checking achievement error all is to adopt 1 velocity stage all much smaller than the technical indicator of SD145 standard code and examine and determine achievement at every turn, only examines and determine 1 time.Actual production calibrating running then is with 1 velocity stage, and the calibrating car comes and goes respectively to be examined and determine 1 time, promptly examines and determine the data averages as this instrument calibrating achievement with 2 times, by the mathematical statistics analysis, will further increase its fiduciary level.This shows that the improvement innovation of current meter calibration method of the present invention and calibrating erecting equipment thereof is feasible as monitoring householder method in the current meter calibrating.
| Sequence number № | Calibrating vehicle velocity V m/s | Instrument rotation speed n r | Waterpower pitch K 1 m | K 1Value deviation K 1-K 0/ K 0 ％ |
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | 0.8991 0.8989 0.8994 0.8994 0.8987 0.8989 0.8993 0.8994 0.8989 0.8993 0.8988 0.8993 0.8992 0.8996 0.8994 0.8992 0.8998 0.8996 | 3.6485 3.6559 3.6668 3.6628 3.6628 3.6668 3.6677 3.6688 3.6747 3.6742 3.6519 3.6519 3.6519 3.6512 3.6519 3.6534 3.6519 3.6523 | 0.2445 0.2440 0.2434 0.2436 0.2434 0.2432 0.2433 0.2432 0.2427 0.2430 0.2442 0.2443 0.2443 0.2445 0.2444 0.2442 0.2445 0.2444 | 0.00 -0.20 -0.45 -0.37 -0.45 -0.53 -0.49 -0.53 -0.74 -0.51 -0.12 -0.08 -0.08 0.00 -0.04 -0.12 0.00 -0.04 |
| On average | 0.8992 | 0.2438 | 0.27* |
Annotate: absolute value is average: K
0=0.2445m
Subordinate list 2 № 102 instruments calibrating outcome tables of the present invention
| Sequence number № | Calibrating vehicle velocity V m/s | Instrument rotation speed n r | Waterpower pitch K 1 m | K 1Value deviation K 1-K 0/ K 0 ％ |
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | 0.8991 0.8989 0.8994 0.8994 0.8987 0.8989 0.8993 0.8994 0.8989 0.8993 0.8988 0.8993 0.8992 0.8996 0.8994 0.8972 0.8998 0.8996 | 3.6430 3.6403 3.6452 3.8632 3.6452 3.6400 3.6544 3.6630 3.6452 3.6474 3.6630 3.6585 3.6608 3.6585 3.6483 3.6530 3.6608 3.6519 | 0.2449 0.2450 0.2448 0.2436 0.2446 0.2450 0.2442 0.2436 0.2447 0.2446 0.2435 0.2439 0.2437 0.2440 0.2446 0.2430 0.2439 0.2444 | 0.04 0.08 0.00 -0.49 -0.08 0.08 -0.25 -0.49 -0.04 -0.08 -0.53 -0.37 -0.45 -0.33 -0.08 -0.74 -0.37 -0.16 |
| On average | 0.8991 | 0.2442 | 0.26* |
Annotate: absolute value is average: K
0=0.2448m
Annotate: the * absolute value is average: K
0=0.2547m
Subordinate list 4 № 104 instruments calibrating outcome table
| Sequence number № | The calibrating vehicle velocity V 1 m/s | The instrument rotation speed n 1 r | Waterpower pitch K 1 m | K 1Value deviation K 1-ΔK 1/ K 0 ％ |
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | 0.8989 0.8989 0.8989 0.8991 0.8991 0.8991 0.8991 0.8991 0.8992 0.8990 0.8994 0.8994 0.8994 0.8994 0.8993 0.8996 0.8998 0.8990 | 3.6810 3.6810 3.6810 3.6832 3.6832 3.6810 3.6810 3.6810 3.6832 3.6900 3.6878 3.6900 3.6900 3.6900 3.6923 3.6946 3.6946 3.6810 | 0.2423 0.2423 0.2423 0.2422 0.2422 0.2424 0.2424 0.2424 0.2422 0.2417 0.2420 0.2418 0.2418 0.2418 0.2417 0.2416 0.2416 0.2423 | -0.21 -0.21 -0.21 -0.25 -0.25 -0.16 -0.16 -0.16 -0.25 -0.45 -0.33 -0.41 -0.41 -0.41 -0.45 -0.49 -0.49 -0.21 |
| On average | 0.8992 | 0.2420 | 0.29 * |
Annotate: the * absolute value is average: K
0=0.2428m
The conventional calibrating data of table 5 № 101 instruments is calculated with least square method and the inventive method respectively
| 7 | 19 | 0.2445 | 0.0080 | 0.28 | 0.00 | 15.9 | 0.2454 | 0.37 | 0．37 |
| 20 | 0.2446 | 0.0066 | 0.29 | 0.04 | -4.3 | 0.2440 | -0.2O | -0.25 | |
| 21 | 0.2446 | 0.0071 | 0.32 | 0.04 | 2.9 | 0.2440 | -0.20 | -0.25 | |
| 8 | 22 | 0.2449 | 0.0075 | 0.34 | 0.16 | 8.7 | 0.2453 | 0.33 | 0.16 |
| 23 | 0.2449 | 0.0073 | 0.35 | 0.16 | 5.8 | 0.2451 | 0.25 | 0.08 | |
| 24 | 0.2448 | 0.0073 | 0.44 | 0.12 | 5.8 | 0.2440 | -0.20 | -0.33 | |
| On average | 0.2445 | 0.0069 | 0.40 | 0.21 ★ | 14.2 ★ | 0.2444 | 0.29 ★ | 0.18 ★ |
Annotate:
★Absolute value is average
The calibration equation principal parameter that least square method is calculated is average
The average C of additional coefficient
0=0.0069m/s.
It is average that the inventive method is calculated the calibration equation principal parameter
The conventional calibrating data of subordinate list 6 № 102 instruments is calculated with least square method and the inventive method respectively
| 3 | 7 | 0.2454 | 0.0060 | 0.65 | 0.25 | -15.4 | 0.2445 | -0.12 | -0.37 |
| 8 | 0.2454 | 0.0078 | 0.63 | 0.25 | 9.9 | 0.2451 | 0.12 | -0.12 | |
| 9 | 0.2453 | 0.0070 | 0.57 | 0.20 | -1.4 | 0.2445 | -0.12 | -0.33 | |
| 4 | 10 | 0.2444 | 0.0064 | 0.35 | -0.16 | -9.9 | 0.2442 | -0.25 | -0.04 |
| 11 | 0.2445 | 0.0057 | 0.33 | -0.12 | -19.7 | 0.2443 | -0.20 | -0.08 | |
| 12 | 0.2443 | 0.0076 | 0.41 | -0.20 | 7.0 | 0.2442 | -0.25 | -0.04 | |
| 5 | 13 | 0.2445 | 0.0085 | 0.63 | -0.12 | 19.7 | 0.2443 | -0.20 | -0.08 |
| 14 | 0.2445 | 0.0087 | 0.35 | -0.12 | 22.5 | 0.2442 | -0.25 | -0.12 | |
| 15 | 0.2445 | 0.0082 | 0.59 | -0.12 | 15.5 | 0.2441 | -0.29 | -0.16 | |
| 6 | 16 | 0.2453 | 0.0074 | 0.23 | 0.20 | 4.2 | 0.2448 | 0.00 | 0.20 |
| 17 | 0.2452 | 0.0084 | 0.25 | 0.16 | 18.3 | 0.2453 | 0.20 | 0.04 | |
| 18 | 0.2448 | 0.0062 | 0.44 | 0.00 | -12.7 | 0.2442 | -0.25 | -0.25 | |
| 7 | 19 | 0.2446 | 0.0080 | 0.40 | -0.08 | 12.7 | 0.2445 | -0.12 | -0.04 |
| 20 | 0.2449 | 0.0070 | 0.39 | 0.04 | -1.4 | 0.2451 | 0.12 | 0.08 | |
| 21 | 0.2448 | 0.0073 | 0.48 | 0.00 | 2.8 | 0.2450 | 0.08 | 0.08 | |
| 8 | 22 | 0.2447 | 0.0060 | 0.46 | -0.04 | -15.5 | 0.2444 | -0.16 | -0.12 |
| 23 | 0.2446 | 0.0073 | 0.50 | -0.08 | 2.8 | 0.2445 | -0.12 | 0.04 | |
| 24 | 0.2445 | 0.0073 | 0.61 | -0.12 | 2.8 | 0.2445 | -0.12 | 0.00 | |
| On average | 0.2448 | 0.0071 | 0.44 | 0.15 * | 12.1 * | 0.2445 | 0.18 * | 0.12 * |
Annotate:
*Absolute value is average
The calibration equation principal parameter that least square method is calculated is average
The average C of additional coefficient
0=0.0071m/s.
It is average that the inventive method is calculated the calibration equation principal parameter
The conventional calibrating data of subordinate list 7 № 103 instruments is calculated with least square method and the inventive method respectively
| 7 | 19 | 0.2549 | 0.0043 | 0.22 | 0.08 | 39.4 | 0.2548 | 0.04 | -0.04 |
| 20 | 0.2547 | 0.0056 | 0.34 | 0.00 | -21.1 | 0.2544 | -0.12 | -0.12 | |
| 21 | 0.2548 | 0.0054 | 0.53 | 0.04 | -23.9 | 0.2547 | 0.00 | -0.04 | |
| 8 | 22 | 0.2551 | 0.0075 | 0.32 | 0.16 | 5.6 | 0.2547 | 0.00 | -0.16 |
| 23 | 0.2550 | 0.0067 | 0.29 | 0.13 | -5.6 | 0.2546 | -0.04 | -0.16 | |
| 24 | 0.2533 | 0.0097 | 0.54 | -0.55 | 36.6 | 0.2537 | -0.39 | 0.16 | |
| On average | 0.2547 | 0.0071 | 0.42 | 0.22 * | 19.9 * | 0.2546 | 0.16 * | 0.15 |
Annotate:
*Absolute value is average
The calibration equation principal parameter that least square method is calculated is average
The average C of additional coefficient
0=0.0071m/s.
It is average that the inventive method is calculated the calibration equation principal parameter
The conventional calibrating data of subordinate list 8 № 104 instruments is calculated with least square method and the inventive method respectively
| 3 | 7 | 0.2434 | 0.0066 | 0.64 | 0.25 | -14.3 | 0.2419 | -0.37 | -0.62 |
| 8 | 0.2436 | 0.0062 | 0.38 | 0.33 | -19.5 | 0.2426 | -0.08 | -0.41 | |
| 9 | 0.2434 | 0.0072 | 0.36 | 0.25 | -6.5 | 0.2425 | -0.12 | -0.37 | |
| 4 | 10 | 0.2431 | 0.0070 | 0.42 | 0.12 | -9.1 | 0.2428 | 0.00 | -0.12 |
| 11 | 0.2437 | 0.0067 | 0.40 | 0.37 | -13.0 | 0.2430 | 0.08 | -0.29 | |
| 12 | 0.2437 | 0.0073 | 0.53 | 0.37 | -5.2 | 0.2437 | 0.37 | 0.00 | |
| 5 | 13 | 0.2425 | 0.0090 | 0.42 | -0.12 | 16.9 | 0.2426 | -0.08 | 0.04 |
| 14 | 0.2420 | 0.0090 | 0.21 | -0.32 | 16.9 | 0.2423 | -0.21 | 0.12 | |
| 15 | 0.2420 | 0.0075 | 0.57 | -0.32 | -2.6 | 0.2422 | -0.25 | 0.08 | |
| 6 | 16 | 0.2426 | 0.0085 | 0.22 | -0.08 | 10.4 | 0.2429 | 0.04 | 0.12 |
| 17 | 0.2426 | 0.0076 | 0.28 | -0.08 | -1.3 | 0.2427 | -0.04 | 0.04 | |
| 18 | 0.2426 | 0.0071 | 0.16 | -0.08 | -7.8 | 0.2422 | -0.25 | 0.16 | |
| 7 | 19 | 0.2426 | 0.0087 | 0.46 | -0.08 | 13.0 | 0.2427 | -0.04 | 0.04 |
| 20 | 0.2428 | 0.0080 | 0.44 | 0.00 | 3.9 | 0.2426 | -0.08 | -0.08 | |
| 21 | 0.2428 | 0.0077 | 0.32 | 0.00 | 0.0 | 0.2428 | 0.00 | 0.00 | |
| 8 | 22 | 0.2431 | 0.0081 | 0.54 | 0.12 | 5.2 | 0.2431 | 0.12 | 0.00 |
| 23 | 0.2431 | 0.0079 | 0.34 | 0.12 | 2.6 | 0.2439 | 0.04 | 0.33 | |
| 24 | 0.2432 | 0.0080 | 0.28 | 0.16 | 3.9 | 0.2433 | 0.21 | 0.00 | |
| On average | 0.2428 | 0.0077 | 0.39 | 0.21 * | 9.3 * | 0.2427 | 0.20 * | 0.15 * |
Annotate:
*Absolute value is average
The calibration equation principal parameter that least square method is calculated is average
The average C of additional coefficient
0=0.0077m/s.
It is average that the inventive method is calculated the calibration equation principal parameter
Claims (5)
1. the calibration method of a current meter may further comprise the steps:
(1) quotes calibration equation additional coefficient standard value C in the tested current meter product technology standard
B
(2) determine that experimental formula low speed sits up straight punctuate: O, C
B
(3) according to calibrating groove characteristic analysis-by-synthesis, determine favor speed V
i
(4) detect the current meter inner friction moment with moment instrument;
(5) detected current meter is installed in the measuring staff bottom;
(6) current meter is put in the water gently, measuring staff is fixed on the calibrating car;
(7) axial orientation of adjustment instrument;
(8) detect the speed V that examines and determine car
i, instrument output signal R
iAnd last T accordingly
i
(9) rotation speed n of calculating current meter
i
(10) calculate K
1Value.
2, according to the calibration method of the described current meter of claim 1, it is characterized in that: a check point only is set in the calibrating procedure.
3, according to the calibration method of claim 1 or 2 described current meters, it is characterized in that: the axial orientation of adjustment instrument is to adopt the laser orientation device.
4, the employed current meter calibrating of the described calibration method of a kind of claim 1 erecting equipment is equipped with current meter fixedly measuring staff and signal-transmitting cable on the calibrating car, and it is characterized in that: the cross section of measuring staff is streamlined.
5, according to the described current meter calibrating of claim 4 erecting equipment, it is characterized in that: the signal-transmitting cable wiring is arranged on measuring staff inside.
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|---|---|---|---|
| CN 03113096 CN1220062C (en) | 2003-04-01 | 2003-04-01 | Detecting method of current meter and its detection mounting equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03113096 CN1220062C (en) | 2003-04-01 | 2003-04-01 | Detecting method of current meter and its detection mounting equipment |
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| CN1220062C true CN1220062C (en) | 2005-09-21 |
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Cited By (2)
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| CN101251548B (en) * | 2008-04-02 | 2010-09-08 | 水利部南京水利水文自动化研究所 | Method for designing rotary oar current meter norm edit value slow speed straight line formula |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101251548B (en) * | 2008-04-02 | 2010-09-08 | 水利部南京水利水文自动化研究所 | Method for designing rotary oar current meter norm edit value slow speed straight line formula |
| CN102207513A (en) * | 2011-03-15 | 2011-10-05 | 水利部南京水利水文自动化研究所 | Method for calibrating rotor current meter |
| CN102207513B (en) * | 2011-03-15 | 2012-04-18 | 水利部南京水利水文自动化研究所 | Method for calibrating rotor current meter |
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|---|---|
| CN1474187A (en) | 2004-02-11 |
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