CN101216300A - Diameter measurement instrument metering method - Google Patents
Diameter measurement instrument metering method Download PDFInfo
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- CN101216300A CN101216300A CNA2008100520602A CN200810052060A CN101216300A CN 101216300 A CN101216300 A CN 101216300A CN A2008100520602 A CNA2008100520602 A CN A2008100520602A CN 200810052060 A CN200810052060 A CN 200810052060A CN 101216300 A CN101216300 A CN 101216300A
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- distance
- log
- records
- wheel
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Abstract
The invention discloses a metering method for a pipeline diameter detector, which comprises the following steps of: (1) at the beginning, respectively measuring the frequencies (f1, f2, ellipsis, fn,) of pulses outputted from metering wheels at regular intervals; (2) supposing tracking the No.1 metering wheel at the initial time when the speed differences among wheels are both zero, obtaining the frequencies of all pulses outputted from the metering wheels at tx time, calculating new speed difference variation deterioration values according to the formula of pix=(tx-tx-1)*(fix-f1x)*A+pix-1, if pix is smaller than zero, assigning zero to pix, and re-accumulating the speed difference variation deterioration values; if pix is larger than a threshold value, switching the tracking metering wheel to No.i metering wheel, and clearing all pix as zero; and if pix is larger than zero and smaller than the threshold value, continuing tracking the No.1 metering wheel. The inventive metering method for the pipeline diameter detector avoids errors arising from frequent switching the tracking metering wheel due to the fluctuation of speed difference, so as to improve the measurement accuracy.
Description
Technical field
The present invention relates to a kind of pipe detection device, particularly relate to a kind of driving range metering method of drift diameter instrument.
Background technology
Drift diameter instrument is the visual plant that detects pipe deforming, also claim the pipeline reducing diameter detecting device, its physical construction as shown in Figure 1, the outside of drift diameter instrument is columniform housing (1), in housing (1), be provided with electronic system storehouse (4), be equipped with in the electronic system storehouse (4) and be used for gathering, the electronic system (not shown) of processing and tracer signal, displacement transducer in the electronic system connects with umbrella stand (2) by mechanical transmission structure, the external stability of drift diameter instrument termination has leather cup (3), the flare structure, be evenly equipped with a plurality of wheels (6) of having the records of distance by the log in the outside of housing (1), the wheel (6) of having the records of distance by the log is connected with electronic system by cable, in housing (1) head ground marker signal receiving antenna (5) is installed, ground marker signal receiving antenna (5) is connected with electronic system by cable.
The detected pipe deforming information of drift diameter instrument must accurately be located just meaningfully, and positioning accuracy request promptly detects 1 kilometer pipeline less than 1 ‰, and the position at detected defective place and the distance of physical location must be less than 1m.Therefore, must carry the high-precision system that has the records of distance by the log of a cover in drift diameter instrument inside.The system that has the records of distance by the log and its reducing detection system collaborative work, the distance of record drift diameter instrument current location and starting point when detecting the caliber distortion, the electronic system of whole drift diameter instrument as shown in Figure 2, mainly comprise: receive the pulse signal of having the records of distance by the log, handle, and the signal after will handling sends the system that has the records of distance by the log of master controller to from the wheel of having the records of distance by the log; The working time of accurate recording drift diameter instrument electronic system when starting, and this temporal information is sent to the clock of master controller; Receive and handle being placed on the radio signal that the outer ground marker of pipeline sends, and the signal after will handling sends the ground marker signal receiving module of master controller to; Reception is also handled the pipeline reducing diameter signal that sends from displacement transducer, and the signal after will handling sends the reducing signal processing module of master controller to; Receive the information of having the records of distance by the log, temporal information, reducing information and land mark information that master controller sends, and store data-storage system in the nonvolatile memory into according to certain form; And the work that is used to coordinate the system of having the records of distance by the log, ground marker signal receiving module, clock and reducing signal processing module, and receive the data that they send, after being unified to handle, these data send to the master controller of data-storage system.
The system that has the records of distance by the log generally finishes the work of having the records of distance by the log by the wheel of having the records of distance by the log.Its ultimate principle is: when drift diameter instrument moves, the wheel of having the records of distance by the log is close on the inner-walls of duct, rotate along with the operation of drift diameter instrument, revolution is crossed certain angle (can be converted into certain distance according to this angle), the wheel of having the records of distance by the log just sends a pulse and gives the system that has the records of distance by the log, the system that has the records of distance by the log has the records of distance by the log according to the number of pulse and takes turns the distance that turns over, and then calculates the distance of drift diameter instrument walking.
But, be very insecure only by the wheel of having the records of distance by the log, this be because:
The first, under the situation of having only the wheel of having the records of distance by the log, break down in case in operational process, have the records of distance by the log to take turns, as: when stuck, the wheel no-output of having the records of distance by the log, then the mileage of back will not be recorded; And export when undesired (time few for a long time) when the pulse of the wheel output of having the records of distance by the log, the mileage that then writes down later is with incorrect.
The second, when drift diameter instrument runs to the pipeline place of threeway, in case the wheel of having the records of distance by the log falls into wherein and will stop operating very soon, and then the distance of threeway section will not be recorded, and can cause the error of having the records of distance by the log more greatly,
The 3rd, as if wheel accidental the skidding in rotation process of having the records of distance by the log, the wheel of having the records of distance by the log when skidding is to slide rather than rotation, and then does not export the pulse of having the records of distance by the log in sliding process, and this place's distance is not recorded, and increases the error of having the records of distance by the log;
The 4th, wheel is to be close on the inner-walls of duct owing to have the records of distance by the log, and when moving in the pipeline of long distance, work under bad environment, wearing and tearing takes place easily or defective occurs, and then the distance relation that causes original wheel of having the records of distance by the log to turn over angle and its representative changes, the increase error of having the records of distance by the log.
Therefore, in the system of having the records of distance by the log, adopt the wheel construction of having the records of distance by the log more.Each road of system's real time monitoring wheel of having the records of distance by the log is therefrom selected the wheel of having the records of distance by the log working properly in real time and is followed the tracks of and have the records of distance by the log, though have one undesired, also can obtain the correct pulse of having the records of distance by the log from other wheels of having the records of distance by the log, can reduce error greatly thus.
Traditional method for optimizing is after detecting the velocity contrast that occurs between the wheel of respectively having the records of distance by the log and reaching certain threshold value, therefrom directly selects fastest (it is generally acknowledged fastest be that pulse-losing is minimum), switches to then and follows the tracks of this fastest wheel of having the records of distance by the log.But, frequent switching will take place if selection of threshold is too small, owing to generally can lose 1 to 2 pulse of having the records of distance by the log during each the switching, so length can cause losing the pulse signal of having the records of distance by the log in a large number apart from work, increase the error of having the records of distance by the log, and the excessive a period of time that will lag behind just switches, and so also can lose the pulse of having the records of distance by the log in a large number.
Summary of the invention
In order to address the above problem, the object of the present invention is to provide the driving range metering method of the less drift diameter instrument of a kind of measuring error.
The objective of the invention is to be achieved through the following technical solutions:
A kind of driving range metering method of drift diameter instrument may further comprise the steps:
1) when beginning, system interval a period of time is measured once the have the records of distance by the log pulsed frequency of wheel output of each road, is respectively f1, f2 ... fn;
2) be located at initial time and follow the tracks of No. 1 wheel of having the records of distance by the log, this moment, respectively the velocity contrast between the wheel was 0, at t
xConstantly obtain the pulsed frequency f1 of all wheel outputs of having the records of distance by the log
x, f2
x... fn
x, deduct the pulsed frequency f1 that has the records of distance by the log and take turns that is following the tracks of with the wheel pulsed frequency of having the records of distance by the log of not following the tracks of
x, i.e. f2
x-f1
x, f3
x-f1
x... fn
x-f1
x, calculate new velocity contrast and change deterioration value, pi
x=(t
x-t
X-1) * (fi
x-f1
x) * A+pi
X-1, wherein: A is a coefficient, x is 〉=1 integer, t
0=0, pi
X-1Be the velocity contrast deterioration value that adds up before, its value is 0 when initial, if pi
x＜0, then with pi
xAssignment is 0, adds up velocity contrast deterioration value again; If pi
x＞threshold value, then switching is followed the tracks of to have the records of distance by the log to take turns and is the i number wheel of having the records of distance by the log, and all pi
xZero clearing; If 0＜pi
x＜threshold value then continues to follow the tracks of No. 1 wheel of having the records of distance by the log.
The driving range metering method of drift diameter instrument of the present invention is not the wheel of having the records of distance by the log that switches tracking immediately after velocity contrast occurring, but is arranged certain actuation time, and the length of this time is that it is just short more that velocity contrast worsens serious more actuation time by the decision of the deterioration situation of velocity contrast.Frequently switch having the records of distance by the log wheel and losing the error of the pulse of having the records of distance by the log of following the tracks of with regard to having avoided causing like this, thereby improved the accuracy of measuring by velocity contrast fluctuation.
Description of drawings
Fig. 1 is the structural representation of the drift diameter instrument among the present invention;
Fig. 2 is the electronic system architecture block diagram of the drift diameter instrument among the present invention;
Fig. 3 is the process flow diagram of the driving range metering method of drift diameter instrument of the present invention;
Fig. 4 is that the driving range metering method medium velocity difference of drift diameter instrument of the present invention worsens curve map.
Wherein:
1: housing 2: umbrella stand
3: leather cup 4: electronic system
5: land mark signal receiving antenna 6: the wheel of having the records of distance by the log
Embodiment
Be elaborated below in conjunction with the driving range metering method of accompanying drawing to drift diameter instrument of the present invention.
Fig. 3 is the process flow diagram of the driving range metering method of drift diameter instrument of the present invention.As shown in the figure, the driving range metering method of drift diameter instrument of the present invention may further comprise the steps:
When beginning, system interval a period of time is measured the pulsed frequency of the wheel of once respectively having the records of distance by the log.Be located at initial time and follow the tracks of No. 1 wheel of having the records of distance by the log, at this moment, because the speed of the wheel of respectively having the records of distance by the log is 0, so the velocity contrast between them is 0 (S10).At t
1Constantly obtain the pulsed frequency f1 of all wheel outputs of having the records of distance by the log
1... fn
1, this frequency size representative is had the records of distance by the log and is taken turns the speed (S11) that rotates, and deducts the pulsed frequency f1 of No. 1 wheel of following the tracks of of having the records of distance by the log with the pulsed frequency of the wheel of not following the tracks of of having the records of distance by the log
1, i.e. f2
1-f1
1, f3
1-f1
1... fn
1-f1
1(S12).Utilize formula pi then
x=(t
x-t
X-1) * (fi
x-f1
x) * A+pi
X-1Calculate the current velocity contrast of each wheel of having the records of distance by the log and change deterioration value (S13), in the formula:
Pi
x: i number the wheel of having the records of distance by the log changes the deterioration value at tx velocity contrast constantly;
T: time;
A: coefficient, this parameter are by pipe diameter, and parameters such as the wheel diameter of having the records of distance by the log determine, and its value is positive number;
X: integer for 〉=1;
Pi
X-1: at t
xThe velocity contrast of accumulative total changes the deterioration value constantly.
At t
1Constantly, pi
1=(t
1-t
0) * (fi
1-f1
1) * A+pi
0
Since when initial, t
0=0, pi
0=0, so pi
1=t
1* (fi
1-f1
1) * A.Compare pi
1Whether less than 0 (S14), if then with pi
1＜0, then with pi
1Assignment is 0, adds up velocity contrast deterioration value (S15) again, and this is because fi
1Compare f1
1Little a lot, obviously should continue to follow the tracks of the wheel (S10) of having the records of distance by the log for No. 1.If certain fi
1-f1
1Alter a great deal, for example: f2 suddenly
1-f1
1Value very big, then obtain a very big p2
1Value is judged p2
1Whether (S16), if p2 greater than threshold value (this value has pipe diameter equally, the wheel diameter of having the records of distance by the log, the parameter decisions such as wheel upper sensor spacing of having the records of distance by the log)
1＞threshold value is then with all p2
1Zero clearing is also switched No. 2 wheels (S17) of having the records of distance by the log of tracking, repeats above-mentioned driving range metering method (S18).If 0＜pi
1＜threshold value then continues to follow the tracks of No. 1 wheel (S10) of having the records of distance by the log.
Follow the tracks of in continuation under the situation of the wheel of having the records of distance by the log for No. 1, behind the elapsed time t, record the pulsed frequency f1 that each wheel is exported constantly at t2
2, f2
2... fn
2(S1
1), the pulsed frequency of the wheel of having the records of distance by the log that usefulness is not being followed the tracks of deducts the pulsed frequency f1 of No. 1 wheel of following the tracks of of having the records of distance by the log
2, i.e. f2
2-f1
2, f3
2-f1
2... fn
2-f1
1(S12), calculate t then
2Velocity contrast deterioration value constantly, that is: pi
2=(t
2-t
1) * (fi
2-f1
2) * A+pi
1Equally, if pi
2＜0 (S14) is then with pi
2Assignment is 0 (S15); If pi
2＞threshold value is then switched and is followed the tracks of the i number wheel of having the records of distance by the log, and all pi
2Zero clearing; If 0＜pi
2＜threshold value then continues to follow the tracks of No. 1 wheel of having the records of distance by the log.
The change curve of pi as shown in Figure 4, after velocity contrast occurring, system is not the wheel of having the records of distance by the log that switches tracking immediately, but arranged certain actuation time, the length of this time is that it is just short more that velocity contrast worsens serious more actuation time by the decision of the deterioration situation of velocity contrast.So just avoided causing frequent the having the records of distance by the log wheel and losing the error of the pulse of having the records of distance by the log of following the tracks of of switching by velocity contrast fluctuation.
Above-mentioned A value and threshold value determination method are as follows:
For improving the real-time of computing, adopt the short integer computing, threshold value generally is set as the integer about 60000.Time t is unit with the millisecond, frequency is unit with Hz, the following of A is limited to 1, the upper limit need be calculated according to limiting case actual in the engineering, the output frequency of wheel of for example having the records of distance by the log in the one-time detection engineering is 1000Hz to the maximum, and then limiting case is exactly that difference on the frequency reaches 1000Hz in 1ms, so carry out inverse operation according to the deterioration formula, A=60000/ (1 * 1000)=60, so the scope of A is exactly 1 to 60.If threshold value difference, the arithmetic unit difference selected for use then can suitably be revised.
Determine after the scope of A, can repeatedly test to determine the A value, also can determine the A value by emulation experiment by the pipeline of reality.Different A values is selected in experiment each time for use, and these values are to be spacedly distributed in the scope of A.Can tentatively determine optimum A value according to experimental result,, then can near this A value, carry out trace adjustment and continue experiment if need higher precision.After adopting driving range metering method of the present invention, carry out manual simulation's experiment, promptly send the pulse that the different wheel of having the records of distance by the log of multiple signals simulation is sent with the drift diameter instrument analogue system, and by setting the signal frequency that analogue system is sent different variations takes place often, inhomogeneous with simulation drift diameter instrument travelling speed, in pipeline, run into operating modes such as the point of slippage and threeway.Compare by the issued data and the detected distance of system of having the records of distance by the log at last and obtain following data:
Table 1 experimental data
| Send data mileage (m) | The pulse number that sends | The system that has the records of distance by the log output pulse number | The system-computed of having the records of distance by the log goes out distance (m) | Error (ten thousand/) |
| 400,000 | 41669704 | 41669657 | 399,994.3 | 0.14 |
| 400,000 | 41669704 | 41669658 | 399,994.7 | 0.13 |
| 400,000 | 41669704 | 41669655 | 399,995.7 | 0.11 |
| 300,000 | 31252278 | 31252235 | 299,998.3 | 0.06 |
| 300,000 | 31252278 | 31252231 | 299,995.1 | 0.16 |
| 300,000 | 31252278 | 31252244 | 299,999.3 | 0.02 |
From the table data as can be seen, adopt driving range metering method of the present invention after, detected distance is dwindled greatly with the error of actual range, thereby has significantly improved accuracy of detection.
Claims (1)
1. the driving range metering method of a drift diameter instrument is characterized in that may further comprise the steps:
1) when beginning, system interval a period of time is measured once the have the records of distance by the log pulsed frequency of wheel output of each road, is respectively f1, f2 ... fn;
2) be located at initial time and follow the tracks of No. 1 wheel of having the records of distance by the log, this moment, respectively the velocity contrast between the wheel was 0, at t
xConstantly obtain the pulsed frequency f1 of all wheel outputs of having the records of distance by the log
x, f2
x... fn
x, deduct the pulsed frequency f1 that has the records of distance by the log and take turns that is following the tracks of with the wheel pulsed frequency of having the records of distance by the log of not following the tracks of
x, i.e. f2
x-f1
x, f3
x-f1
x... fn
x-f1
x, calculate new velocity contrast and change deterioration value, pi
x=(t
x-t
X-1) * (fi
x-f1
x) * A+pi
X-1, wherein: A is a coefficient, x is 〉=1 integer, t
0=0, pi
X-1Be the velocity contrast deterioration value that adds up before, its value is 0 when initial, if pi
x＜0, then with pi
xAssignment is 0, adds up velocity contrast deterioration value again; If pi
x＞threshold value, then switching is followed the tracks of to have the records of distance by the log to take turns and is the i number wheel of having the records of distance by the log, and all pi
xZero clearing; If 0＜pi
x＜threshold value then continues to follow the tracks of No. 1 wheel of having the records of distance by the log.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100520602A CN101216300A (en) | 2008-01-14 | 2008-01-14 | Diameter measurement instrument metering method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100520602A CN101216300A (en) | 2008-01-14 | 2008-01-14 | Diameter measurement instrument metering method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101216300A true CN101216300A (en) | 2008-07-09 |
Family
ID=39622783
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100520602A Pending CN101216300A (en) | 2008-01-14 | 2008-01-14 | Diameter measurement instrument metering method |
Country Status (1)
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|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104567914A (en) * | 2013-10-24 | 2015-04-29 | 上海佳友市政建筑有限公司 | Pipeline track instrument provided with novel logging wheel |
| CN104567915A (en) * | 2013-10-24 | 2015-04-29 | 上海佳友市政建筑有限公司 | Inwardly-collected righting claw type pipeline track measuring meter with force-balancing log wheels |
-
2008
- 2008-01-14 CN CNA2008100520602A patent/CN101216300A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104567914A (en) * | 2013-10-24 | 2015-04-29 | 上海佳友市政建筑有限公司 | Pipeline track instrument provided with novel logging wheel |
| CN104567915A (en) * | 2013-10-24 | 2015-04-29 | 上海佳友市政建筑有限公司 | Inwardly-collected righting claw type pipeline track measuring meter with force-balancing log wheels |
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Open date: 20080709 |