CN108916660B - Water leakage point detection method based on Hall flowmeter - Google Patents
Water leakage point detection method based on Hall flowmeter Download PDFInfo
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- CN108916660B CN108916660B CN201810259310.3A CN201810259310A CN108916660B CN 108916660 B CN108916660 B CN 108916660B CN 201810259310 A CN201810259310 A CN 201810259310A CN 108916660 B CN108916660 B CN 108916660B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
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Abstract
The invention relates to a detection method based on a Hall flowmeter water leakage point, which is suitable for water supply of a constant-diameter pipeline, a Hall flowmeter is arranged at a water supply point, Hall trigger time intervals are acquired through the Hall flowmeter, the detection method is stopped after water supply amount is enough to fill the whole pipeline, a series of Hall trigger time interval data T0, T1, T2, T3 … …, Tn-1 and Tn are acquired, fast Fourier change is carried out on a data string to obtain frequency domain sequence data T0 ', T1 ', T2 ', T3 ', … …, Tn-1 ' and Tn ', then the second half segment value is changed into 0, after the high frequency part is completely removed, Fourier inverse change is carried out on T0 ', T1 ', T2 ', T3 ' … …, Tn-1 ' and Tn ' to obtain new number series T0, T1, T2, T3 … …, Tn-1, Tx < [ (Tx-2+ Tx-1/2 + Tx + x) ] in a search sequence, and all Tx + Tx-1 < (Tx-2+ 1/2) < ') And (3) obtaining a new number sequence X1 and X2 … Xt by taking value points, searching the maximum value Xk of the sequence X1 and X2 … Xt, and finding the corresponding number sequence number TZ of the Xk in T0, T1, T2, T3 … …, Tn-1 and Tn, wherein the distance from the Xk to a water supply point (Z/n) L is the position of a water leakage point, and L is the total length of the water pipe.
Description
Technical Field
The invention relates to the technical field of water supply, in particular to a water leakage point detection method based on a Hall flowmeter.
Background
When water leakage occurs at the rear end of the pipeline, the water leakage distance cannot be detected directly through equipment of a water supply point so as to reduce the detection time. The time waste can be greatly reduced only by the manual visit at the rear end, and due to the reasons of attractiveness and the like and special requirements, the existing water supply pipelines are all arranged to be hidden, the difficulty of the manual visit at the rear end is increased, and a method capable of directly finding the water leakage position is needed.
Disclosure of Invention
The invention aims to solve the technical problem of providing a Hall flowmeter-based water leakage point detection method, which can obtain Hall trigger time interval data through a Hall flowmeter, directly inquire the distance from a water leakage point to a water supply point through analyzing the data, and further find the specific position of the water leakage point.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the detection method based on the water leakage point of the Hall flowmeter is characterized by comprising the following steps: the method is suitable for the water supply state of the constant-diameter pipeline, and the Hall flowmeter is arranged at the water supply point, and the method comprises the following specific steps:
step 1, measuring the total length of a water supply pipeline to be L;
step 2, a Hall flowmeter is arranged at a water outlet pipe of the water supply point and used for measuring Hall trigger time intervals;
and 3, starting water supply, stopping after the water supply amount is enough to fill the whole pipeline, and recording a series of time point data t through the Hall flow meter0,t1,t2……tn-1,tn；
Step 4, carrying out fast Fourier transform on the time point data string to obtain frequency domain sequence data t0',t1',t2',t3'……tn-1',tn'；
Step 5, mixing tn/2To t0' the data is rewritten to 0, the high frequency part is totally removed, and a brand new number sequence t is obtained0”,t1”,t2”,t3”……tn-1”,tn”；
Step 6, for t0”,t1”,t2”,t3”……tn-1”,tn"Fourier inverse transform to obtain new series T0, T1, T2, T3 … … Tn-1, Tn;
step 7, searching Tx in the sequence<[(Tx-2+Tx-1)/2]And Tx<[(Tx+2+Tx+1)/2]Obtaining new numerical sequences X1, X2 … Xt by taking the value points of all the X;
step 8, searching the maximum value Xk of the sequence X1, X2 … Xt;
step 9, finding out the corresponding sequence numbers Tz of Xk corresponding to T0, T1, T2, T3 … …, Tn-1 and Tn;
and 10, the length distance from the water supply point (z/n) to L is the position of the water leakage point.
The Hall flowmeter is a turbine Hall flowmeter.
The Hall trigger average time interval is the time length used by the turbine in the turbine Hall flowmeter to rotate for one circle.
Said continuously variable time interval t0,t1,t2……tn-1,tnThe time spent by the Hall flowmeter in each revolution of the turbine in the Hall flowmeter is continuously and sequentially recorded under the condition of water pressure change.
The detection method based on the Hall flowmeter water leakage point can achieve the following beneficial effects:
first, the sequence t0”,t1”,t2”,t3”……tn-1”,tn"is a frequency domain sequence, obtained by dividing tn2To t0' data ofRewriting to 0, and eliminating all high-frequency parts, so that the curve obtained by performing Fourier inverse change on the data in the step 6 is smoother, and the calculation accuracy can be improved.
Secondly, a minimum value point in the curve is found in step 8, which indicates that the flow rate suddenly increases when water flows to the point, and thus the situation of water leakage is proved to occur.
Detailed Description
The invention is further described below with reference to specific preferred embodiments.
The detection method based on the water leakage point of the Hall flowmeter is characterized by comprising the following steps: the method is suitable for the water supply state of the constant-diameter pipeline, and the Hall flowmeter is arranged at the water supply point, and the method comprises the following specific steps:
step 1, measuring the total length of a water supply pipeline to be L;
step 2, a Hall flowmeter is arranged at a water outlet pipe of the water supply point and used for measuring Hall trigger time intervals;
and 3, starting water supply, stopping after the water supply amount is enough to fill the whole pipeline, and recording a series of time point data t through the Hall flow meter0,t1,t2……tn-1,tn；
Step 4, carrying out fast Fourier transform on the time point data string to obtain frequency domain sequence data t0',t1',t2',t3'……tn-1',tn'；
Step 5, mixing tn/2To t0' the data is rewritten to 0, the high frequency part is totally removed, and a brand new number sequence t is obtained0”,t1”,t2”,t3”……tn-1”,tn”；
Step 6, for t0”,t1”,t2”,t3”……tn-1”,tn"Fourier inverse transform to obtain new series T0, T1, T2, T3 … … Tn-1, Tn;
step 7, searching Tx in the sequence<[(Tx-2+Tx-1)/2]And Tx<[(Tx+2+Tx+1)/2]OfTaking a value point by X to obtain a new numerical sequence X1, X2 … Xt;
step 8, searching the maximum value Xk of the sequence X1, X2 … Xt;
step 9, finding out the corresponding sequence numbers Tz of Xk corresponding to T0, T1, T2, T3 … …, Tn-1 and Tn;
and 10, the length distance from the water supply point (z/n) to L is the position of the water leakage point.
In this embodiment, the hall flowmeter is a turbine hall flowmeter.
In this embodiment, the average time interval of the hall triggers is the time length used by the turbine in the turbine hall flowmeter to rotate for one circle.
In the present embodiment, the time interval t is continuously varied0,t1,t2……tn-1,tnThe time spent by the Hall flowmeter in each revolution of the turbine in the Hall flowmeter is continuously and sequentially recorded under the condition of water pressure change.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to those skilled in the art may occur to persons skilled in the art without departing from the spirit and scope of the present invention.
Claims (4)
1. The detection method based on the water leakage point of the Hall flowmeter is characterized by comprising the following steps: the method is suitable for the water supply state of the constant-diameter pipeline, and the Hall flowmeter is arranged at the water supply point, and the method comprises the following specific steps:
step 1, measuring the total length of a water supply pipeline to be L;
step 2, a Hall flowmeter is arranged at a water outlet pipe of the water supply point and used for measuring Hall trigger time intervals;
and 3, starting water supply, stopping after the water supply amount is enough to fill the whole pipeline, and recording a series of time point data t through the Hall flow meter0,t1,t2……tn-1,tn；
Step 4, aiming at the series of time pointsCarrying out fast Fourier transformation on the data string to obtain frequency domain sequence data t0',t1',t2',t3'……tn-1',tn'；
Step 5, mixing tn/2To t0' the data is rewritten to 0, the high frequency part is totally removed, and a brand new number sequence t is obtained0”,t1”,t2”,t3”……tn-1”,tn”；
Step 6, for t0”,t1”,t2”,t3”……tn-1”,tn"Fourier inverse transform to obtain new series T0, T1, T2, T3 … … Tn-1, Tn;
step 7, searching Tx in the sequence<[(Tx-2+Tx-1)/2]And Tx<[(Tx+2+Tx+1)/2]Obtaining new numerical sequences X1, X2 … Xt by taking the value points of all the X;
step 8, searching the maximum value Xk of the sequence X1, X2 … Xt;
step 9, finding out the corresponding sequence numbers Tz of Xk corresponding to T0, T1, T2, T3 … …, Tn-1 and Tn;
and 10, the length distance from the water supply point (z/n) to L is the position of the water leakage point.
2. The Hall flowmeter based water leakage point detection method as claimed in claim 1, wherein: the Hall flowmeter is a turbine Hall flowmeter.
3. The Hall flowmeter based water leakage point detection method as claimed in claim 2, wherein: the Hall trigger average time interval is the time length used by the turbine in the turbine Hall flowmeter to rotate for one circle.
4. The Hall flowmeter based water leakage point detection method according to claim 3, characterized in that: continuously variable time interval t0,t1,t2……tn-1,tnFor the Hall flow meter to continuously and sequentially record each turbine in the Hall flow meter under the condition of water pressure changeTime taken for one week of rotation.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE3607913C1 (en) * | 1986-03-10 | 1987-08-13 | Fraunhofer Ges Forschung | Method for locating leaks in pipelines |
| US6860286B2 (en) * | 2002-07-29 | 2005-03-01 | Duc T. Doan | Water supply system for multiple dwelling units |
| CN1164886C (en) * | 2002-12-10 | 2004-09-01 | 西安交通大学 | Oil gas pipeline leak intelligent on line monitoring method based on distribution type optical fibre sensor |
| CN100374776C (en) * | 2006-04-14 | 2008-03-12 | 北京工业大学 | Apparatus and method for monitoring pipeline leakage based on distributed optical fiber acoustic sensing technology |
| WO2011103032A2 (en) * | 2010-02-18 | 2011-08-25 | US Seismic Systems, Inc. | Optical detection systems and methods of using the same |
| CN202041494U (en) * | 2010-12-31 | 2011-11-16 | 山东工商学院 | Landfill leak detection data acquiring system |
| CN102563361A (en) * | 2012-01-18 | 2012-07-11 | 中国石油大学(华东) | Device and method for detecting and positioning leakage of gas transmission pipeline based on conventional data and sound wave signals |
| CN106764468B (en) * | 2017-01-05 | 2019-01-15 | 北京埃德尔黛威新技术有限公司 | A kind of leakage early warning system and adaptive spectrum noise-eliminating method |
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