CN101968162B - Pipeline leakage positioning system and method based on collaborative detection with negative pressure wave and sound wave - Google Patents
Pipeline leakage positioning system and method based on collaborative detection with negative pressure wave and sound wave Download PDFInfo
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Abstract
The invention relates to pipeline leakage positioning system and method based on collaborative detection with negative pressure wave and sound wave, which belong to the technical field of fault diagnosis of a petroleum transmission pipeline. Leakage points in a pipeline are detected based on a conventional negative pressure wave technology, an upper computer and a pressure detection lower computer are arranged in two dispatching rooms at the front and rear ends of a long petroleum transmission pipeline and lower computers for sound wave signal detection are arranged on the long petroleum transmission pipeline at an interval of 0.5-1km. The invention has the advantages that by using the collaborative detection with the negative pressure wave and the sound wave, the invention can position the leakage points of the pipeline precisely and lower the false report rate effectively; because a GPRS technology is adopted for communication, the invention is free from paving lines, has low cost and is convenient to move. The positioning system benefits the avoidance of large data volume transmission and the improvement of the communication efficiency. The positioning method used by the upper computer is simple and easy to use.
Description
Technical field
The invention belongs to oil pipeline fault diagnosis technology field, particularly a kind of pipe leakage positioning system and method based on suction wave and sound wave synergic detection.
Background technology
At present, domestic test fluid conveyance conduit leakage technology mainly adopts the suction wave detection method, and the suction wave that it produces during according to pipe leakage detects the generation of leaking, and comes leakage is positioned according to the time difference and the velocity of wave that different pressure transducers receives signal.Negative pressure wave method is commonly used on the long distance pipeline, and it is little to have calculated amount, and is highly sensitive, the characteristics that can check rapidly and report to the police.But suction wave detection method bearing accuracy is not high, and very easily operate as normal (like turn on pump, pump etc. is transferred in the termination of pumping) generation of pumping plant is reported by mistake.The sonic detection method is when tube wall take place to leak, and sends the sound of oil spout, and this sound can transmit to both sides along tube wall fast, utilizes sonic sensor to detect the due in that leakage point sends oil spout sound, also can position the leak position.Sonic detection method bearing accuracy is higher, but because acoustic signals is propagated on tube wall, it is very fast to decay, and makes this method that positive effect can only just be arranged in limited distance.
Summary of the invention
To the deficiency of prior art, the present invention provides a kind of pipe leakage positioning system and method based on suction wave and sound wave synergic detection.Adopt suction wave and sound wave synergic to detect, can accurately locate, effectively reduce rate of false alarm simultaneously the pipe leakage point; Communication modes adopts the radio communication unit technology, and cost is low, conveniently moving; Avoid the big data quantity transmission, improved the efficient of communication.
The present invention is based on the conventional ducted leakage point of suction wave technology for detection; In the control room, first last two station of a pipeline, establish host computer and pressure detection slave computer; Every separated 0.5km～1km establishes acoustic signals and detects slave computer on pipeline, and described acoustic signals detects slave computer and comprises electric supply installation, sonic sensor, signal condition unit, signal processing unit, GPS module and GPRS module; Described host computer comprises industrial computer and uninterrupted power source; Described pressure detection slave computer is intelligent high-speed real time data sampling device and pressure transducer;
Wherein electric supply installation connects sonic sensor, signal condition unit and signal processing unit; The sonic sensor output terminal connects the input end of signal condition unit; The output terminal of signal condition unit connects the input end of signal processing unit; GPS module output terminal connects the input end of signal processing unit; The signal processing unit output terminal connects the input end of GPRS module, and GPRS module data transmission terminal sends pipe leakage information to industrial computer, and uninterrupted power source connects industrial computer, intelligent high-speed real time data sampling device and pressure transducer; The input end of pressure transducer output terminal connection of intelligent high-speed real-time sampling apparatus, the output terminal of intelligent high-speed real time data sampling device connects input end of industrial control machine.
It is the intelligent high-speed real time data sampling device of the patent of invention of 03133458X that described intelligent high-speed real time data sampling device adopts application number.
The method that the pipe leakage positioning system that detects based on suction wave and sound wave synergic positions, carry out according to the following steps:
Step 1: detect the decline flex point that suction wave produces in the pipeline through pressure transducer, confirm whether pipeline leaks the Position Approximate with leakage point, promptly judge to leak and occur in any two acoustic signals and detect between the slave computers;
Step 2: host computer nearby detects slave computer through the GPRS module to leakage point both sides acoustic signals nearby and sends the request of reception acoustic signals, and awaits a response;
Step 3: after acoustic signals detection slave computer was received control signal, signal processing unit began deal with data and sends the data after handling through the GPRS module to described host computer;
Step 4: host computer receives acoustic signals and detects the internal memory that data that slave computer sends over deposit industrial computer in, leakage point is accurately located and on display, shows according to localization method.
The signal processing unit in the step 3 wherein, the step of its deal with data is following:
Wherein the localization method in the step 4 is following, and when the GPRS transmission mode that adopts based on ICP/IP protocol, under normal condition, host computer can receive that two acoustic signals that take place to leak detect the data that slave computer sends over, according to following formula:
Calculate the size of
;
expression n bugle call ripple input slave computer is apart from the distance of initial station host computer in the formula;
expression n-1 bugle call ripple input slave computer is apart from the distance of initial station host computer;
expression leakage point is apart from the distance of n bugle call ripple input slave computer;
expression leakage point is apart from the distance of n+1 bugle call ripple input slave computer; The velocity of propagation of
expression suction wave in pipeline;
expression sound wave is along the velocity of propagation of tube wall;
expression acoustic signals arrives the moment of n bugle call ripple input slave computer;
expression acoustic signals arrives the moment of n+1 bugle call ripple input slave computer; The decline flex point that
expression initial station suction wave produces constantly;
representes pinpoint leakage information;
When wireless telecommunications occur unusually, only receive that the individual signals acoustic signals detects the slave computer data sent, when the initial station host computer is only received n bugle call ripple input slave computer data sent, according to following formula:
Can accurately calculate the size of
; And when initial station host computer when only receiving n+1 bugle call ripple input slave computer data sent, according to following formula:
Can accurately calculate the size of
, other situation in like manner.
Advantage of the present invention: the present invention adopts suction wave and sound wave synergic to detect, and can accurately locate the pipe leakage point, effectively reduces rate of false alarm simultaneously; Communication modes adopts the GPRS technology, need not laying-out, and cost is low, conveniently moving; Positioning system has been avoided the big data quantity transmission, has improved the efficient of communication; The localization method that host computer uses is simple and easy to use.
Description of drawings
Fig. 1 is a structured flowchart of the present invention;
Fig. 2 is signal condition of the present invention unit and signal processing unit catenation principle figure;
Fig. 3 is a localization method process flow diagram of the present invention;
Fig. 4 is the prescribed form of data transmission of the present invention.
Embodiment
The present invention combines accompanying drawing and embodiment to specify.
Present embodiment: it is GUGSU36 that the GPS module is selected model for use; It is Q2403A that the GPRS module is selected model for use; It is that Lance LC0107 series vibration transducer SN3563 cooperates the LC0207 constant current source to use that sonic sensor is selected model for use; It is ROSEMOUNT 3051 GP3A2B21AB4M5D1 differential pressure transmitters that pressure transducer is selected model for use; It is TMS 320F2812 that signal processing unit adopts model; It is the intelligent high-speed real time data sampling device of the patent of invention of 03133458X that intelligent high-speed real time data sampling device adopts application number.
Pipeline length is 360m in the present embodiment, and wherein host computer 140m is the simulated leakage position from the initial station.Add an acoustic signals detection slave computer along pipeline is every at a distance from 90m, like this, just respectively having an acoustic signals to detect slave computer apart from head and end 90m position.
The present invention, as shown in Figure 1, wherein acoustic signals detection slave computer comprises electric supply installation, sonic sensor, signal condition unit, signal processing unit, GPS module and GPRS module; Described host computer and uninterrupted power source; Described pressure detection slave computer is intelligent high-speed real time data sampling device and pressure transducer;
The connection of this system: as shown in Figure 2; Electric supply installation connects sonic sensor feeder ear, signal condition unit feeder ear and signal processing unit feeder ear; Be sonic sensor, signal condition unit and signal processing unit power supply; The sonic sensor data output end connects the input end DIN1～DIN6 of signal condition unit; The output terminal INA0 of signal condition unit～INA5 connects the input end ADCINA0～ADCINA5 of signal processing unit, the geographical data bus terminal that is connected signal processing unit with the time data output terminal of GPS module, for positioning system provide accurate lock in time information; Signal processing unit SCIRXD and SCITXD output terminal are connected the TXD and the RXD input end of GPRS module respectively; GPRS module data transmission terminal sends pipe leakage information to industrial computer; The output terminal of industrial computer connects display; Uninterrupted power source connects industrial computer, intelligent high-speed real time data sampling device and pressure transducer, the input end of pressure transducer output terminal connection of intelligent high-speed real-time sampling apparatus, and the output terminal of intelligent high-speed real time data sampling device connects input end of industrial control machine.
The course of work of this positioning system: pressure transducer is gathered pressure signal and is deposited database in; And sonic sensor is gathered acoustic signals and is got into signal processing unit after through signal condition unit filtering processing and amplifying; Conversion deposits RAM in through A/D, stamps time tag simultaneously.When oil pipeline take place to leak; Can cause the partial fluid material damage; Cause that local density reduces to form suction wave and transmits to two ends; The decline flex point mistiming that produces through the suction wave that detects the oil pipeline two ends and suction wave transmission velocity of wave can be confirmed the approximate location of leaking, and have also just confirmed to leak into the end to occur between which two acoustic signals detection slave computer.At this moment, the GPRS module of host computer nearby detects the request of slave computer transmitting and receiving data to two acoustic signals of appointment, and awaits a response; After acoustic signals detection slave computer is received control signal; The enabling signal processing unit; Stop the sonic sensor image data, and begin from the RAM of signal processing unit, to take out sonic data one by one according to the time inverted order and do the small echo denoising, the warning value that the amplitude of the sonic data after will handling then and operating mode are set relatively; Seek the first point of amplitude less than warning value, this moment corresponding promptly thinks that sonic sensor receives because the sound due in that pipe leakage produces.Employing sort signal processing mode has confirmed fast that simply because the sound that pipe leakage produces arrives the moment of sonic sensor, the big data quantity of having avoided adopting traditional audiolocation mode to cause transmits, and has improved the efficient of communication.After this, this time corresponding and amplitude information transformat are according to the rules passed to wireless communication module with bus mode and send to host computer.Wireless communication mode adopts the GPRS communication modes based on ICP/IP protocol, and in the packet that sends, stamps time tag and device label.Host computer receives acoustic signals and detects slave computer data sent bag; Become time and amplitude data to deposit the internal memory of industrial computer in through protocol conversion; Calculating the leakage point position accurately according to location algorithm shows on display; And start radio communication unit once more locating information is sent on responsible official's mobile phone with the note form, at last all warning messages and related data are write database in order to inquiry.
The concrete function of each module and realizing as follows:
Sonic sensor is collected extraneous various acoustic signals, requires the sensitivity of sensor and sampling rate enough high, and power consumption simultaneously is low as far as possible, is installed on the oil pipeline and can collects the sound that leakage point sends, and convert acoustical signal to electric signal.The model that adopts in the system is Lance LC0107 series vibration transducer SN3563, cooperates the LC0207 constant current source to use.
The GPS module be each component units of system provide accurate lock in time information, select the GPS GUGSU36 of Henan stars at dawn in the system for use.
The signal condition unit mainly is responsible for carrying out filtering to the electric signal of sonic sensor output and is amplified, and goes out sound frequency range and the signal to noise ratio (S/N ratio) that leakage liquid friction tube wall sends according to the operating mode of reality and the analysis data deducibility that obtains.Can effectively improve signal to noise ratio (S/N ratio) through setting filtering frequency range and enlargement factor, the most of noise of filtering.
Signal processing unit mainly is a dsp board, and the simulating signal of signal condition unit output converts digital signal to through the A/D that carries on the dsp board, and deposits RAM in, stamps time tag simultaneously, and the RAM here plays the effect of metadata cache.When radio communication unit was received the control signal that host computer sends, DSP utilized the processing of IE to data, under the conventional state, and the strategy that DSP takes only storage not handle to data.Take out sonic data from RAM one by one according to the time inverted order earlier and do the small echo denoising; Take the signal amplitude after handling to make comparisons again with the warning value of setting by operating mode in advance; Obtain the data of first amplitude less than warning value; This data point time information corresponding and amplitude information are preserved, like this, just accomplished the process of whole signal Processing.
The GPRS module is selected Q2403A for use.Compare with other wireless communication mode, it is wide that the GPRS technology has the access scope, and transfer rate is high; Advantage such as always online; In order to prevent transmission delay, packet loss and multiple arrangement send to control desk and produce the situation that data are obscured, and wireless communication mode is based on ICP/IP protocol; And require the data of transmission transformat packing according to the rules to transmit, to guarantee that the data that host computer receives are situation of a substation signal supervisory instrument of unique identification.
As shown in Figure 4, be the prescribed form of data transmission, it is the information of acoustic wave packet owing to the leakage generation of appointment that verification head and verification tail tag have been known packet, device number expression is which signal supervisory instrument on this pipeline; The control signal that receives can only select 0 and 1,0 expression initial station to transmit control signal, and 1 expression terminal transmits control signal; Temporal information and amplitude information are data point time information corresponding and the amplitude information that signal processing unit obtains.
Native system is by the host computer that is positioned at first last two stations and detect slave computers along several acoustic signals of piping arrangement and constitute.Host computer whenever will carry out cycle detection to each acoustic signals device at a distance from 6 hours, and the content of detection comprises: the communication situation of judgment means and host computer if connect interruption or not smooth, rebulids connection; Whether the time of judging each pick-up unit is consistent, with GPS system carried out time calibration at set intervals.Simultaneously, device itself also has self-checking function, and the GPRS module is in holding state when not sending data, to save electric energy.Have only when acoustic signals detects the control signal that slave computer receives that host computer sends, just can log-on data transmission terminal transmission packet; The GPRS module of pick-up unit can become holding state again automatically after host computer is accomplished Data Receiving.
Detect based on suction wave and sound wave synergic, mean to have only and report to the police and sound wave is reported to the police satisfiedly simultaneously, assert that just pipeline really leaks when suction wave.Know by theory; Sound wave will be much larger than the velocity of propagation of suction wave in pipeline along the velocity of propagation of tube wall, therefore, and in the ordinary course of things; Arrive the decline flex point moment of the moment of pick-up unit when acoustic signals occurring greater than the upward suction wave generation of standing; Promptly take place to leak at first to be detected by the suction wave flex point, this situation promptly is a kind of unusual, and this is not leakage alarm unusually.Utilize these two types of moment can also distinguish operating mode and leakage alarm.When negative pressure wave method detects pipe leakage; Not only can calculate the approximate location of leakage; Simultaneously, can also calculate the roughly moment of taking place to leak, roughly approaching if acoustic signals arrives the moment of pick-up unit with the moment of leaking through the generation that calculates; Just think effective leakage alarm, otherwise assert it is operating mode.Above-mentioned theory is the problem of resolution system wrong report to a certain extent.
The method that the pipe leakage positioning system that detects based on suction wave and sound wave synergic positions, carry out according to the following steps: as shown in Figure 3,
Step 2: host computer nearby detects slave computer through the GPRS module to leakage point both sides acoustic signals nearby and sends the request of reception acoustic signals, and awaits a response; After acoustic signals detection slave computer was received control signal, signal processing unit began deal with data and sends the data after handling through the GPRS module to described host computer;
Step 4: host computer receives acoustic signals and detects the internal memory that data that slave computer sends over deposit industrial computer in; Leakage point is accurately located and on display, show according to localization method; The vibration that sound wave produces is 5232m/s along the velocity of propagation of water wall; Through calculating, confirm that the position location is 140.6m.
Claims (1)
1. pipe leakage localization method that detects based on suction wave and sound wave synergic; The positioning system that this method adopted; The ducted leakage point of suction wave technology for detection based on routine; In the control room, first last two station of a pipeline, establish host computer and pressure detection slave computer; Every separated 0.5km～1km establishes acoustic signals and detects slave computer on pipeline, and described acoustic signals detects slave computer and comprises electric supply installation, sonic sensor, signal condition unit, signal processing unit, GPS module and GPRS module; Described host computer and uninterrupted power source; Said pressure detection slave computer is intelligent high-speed real time data sampling device and pressure transducer;
Wherein electric supply installation connects sonic sensor, signal condition unit and signal processing unit; The sonic sensor output terminal connects the input end of signal condition unit; The output terminal of signal condition unit connects the input end of signal processing unit; GPS module output terminal connects the input end of signal processing unit; The signal processing unit output terminal connects the input end of GPRS module, and GPRS module data transmission terminal sends pipe leakage information to industrial computer, and uninterrupted power source connects industrial computer, intelligent high-speed real time data sampling device and pressure transducer; The input end of pressure transducer output terminal connection of intelligent high-speed real-time sampling apparatus, the output terminal of intelligent high-speed real time data sampling device connects input end of industrial control machine;
It is characterized in that: this method is carried out according to the following steps:
Step 1: detect the decline flex point that suction wave produces in the pipeline through pressure transducer, confirm whether pipeline leaks the Position Approximate with leakage point, promptly judge to leak and occur in any two acoustic signals and detect between the slave computers;
Step 2: host computer nearby detects slave computer through the GPRS module to leakage point both sides acoustic signals nearby and sends the request of reception acoustic signals, and awaits a response;
Step 3: after acoustic signals detection slave computer was received control signal, signal processing unit began deal with data and sends the data after handling through the GPRS module to described host computer;
The step of signal processing unit processes data is following:
Step 1, stop the sonic sensor image data, and begin from storage unit, to take out sonic data one by one and do the small echo denoising according to the time inverted order;
Step 2, the signal amplitude that takes out after handling successively compare with the warning value of being set by operating mode in advance, obtain the point of first amplitude less than warning value, and this point is corresponding constantly as the moment that is arrived the acoustic signals pick-up unit by the sound wave that leaks generation;
Step 3, this corresponding time of point and amplitude information are passed to the GPRS module with bus mode;
Step 4, restart the sonic sensor image data;
Step 4: host computer receives acoustic signals and detects the internal memory that data that slave computer sends over deposit industrial computer in, leakage point is accurately located and on display, shows according to localization method;
Said localization method is following: when the GPRS transmission mode that adopts based on ICP/IP protocol, under normal condition, host computer can receive that two acoustic signals that take place to leak detect the data that slave computer sends over, according to following formula:
Calculate X
nSize; L in the formula
N+1Expression n bugle call ripple input slave computer is apart from the distance of initial station host computer; L
nExpression n-1 bugle call ripple input slave computer is apart from the distance of initial station host computer; X
nThe expression leakage point is apart from the distance of n bugle call ripple input slave computer; X
N+1The expression leakage point is apart from the distance of n+1 bugle call ripple input slave computer; v
pThe velocity of propagation of expression suction wave in pipeline; v
vThe expression sound wave is along the velocity of propagation of tube wall; T
nThe expression acoustic signals arrives the moment of n bugle call ripple input slave computer; T
N+1The expression acoustic signals arrives the moment of n+1 bugle call ripple input slave computer; T
1The decline flex point that expression initial station suction wave produces constantly; X
nRepresent pinpoint leakage information;
When wireless telecommunications occur unusually, only receive that the individual signals acoustic signals detects the slave computer data sent, when the initial station host computer is only received n bugle call ripple input slave computer data sent, according to following formula:
Can accurately calculate X
nSize; And when initial station host computer when only receiving n+1 bugle call ripple input slave computer data sent, according to following formula:
Can accurately calculate X
nSize, other situation are in like manner.
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