CN101968162A - 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 transport pipeline fault diagnosis technology field, particularly a kind of pipe leakage navigation system and method based on suction wave and sound wave synergic detection.
Background technique
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 of different pressure transducer received signals.Negative pressure wave method is commonly used on the long distance pipeline, and it is little to have amount of calculation, and is highly sensitive, the characteristics that can check rapidly and report to the police.But suction wave detection method Location accuracy is not high, and very easily proper functioning (as 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 fast along tube wall, utilizes sonic sensor to detect the due in that leakage point sends oil spout sound, also can position the leak position.Sonic detection method Location 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
At the deficiencies in the prior art, the invention provides a kind of pipe leakage navigation 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 maneuvering room, first and last two station of a pipeline, establish upper-position unit and Pressure testing lower-position unit, establish acoustic signals every 0.5km～1km and detect lower-position unit on pipeline, described acoustic signals detects lower-position unit and comprises power supply unit, sonic sensor, signal condition unit, signal processing unit, GPS module and GPRS module; Described upper-position unit comprises process control machine and uninterruptable power source; Described Pressure testing lower-position unit is intelligent high-speed real time data sampling device and pressure transducer;
Wherein power supply unit 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, GPRS module data transmission terminal sends pipe leakage information to process control machine, uninterruptable power source connects process control machine, intelligent high-speed real time data sampling device and pressure transducer, the pressure transducer output terminal connects the input end of intelligent high-speed real time data sampling device, and 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 navigation 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 by pressure transducer, determine whether pipeline leaks the Position Approximate with leakage point, promptly judge to leak and occur in any two acoustic signals and detect between the lower-position units;
Step 2: upper-position unit nearby detects lower-position unit by 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 lower-position unit was received control signal, signal processing unit began processing data and passes through the data of GPRS module after described upper-position unit sends processing;
Step 4: upper-position unit receives acoustic signals and detects the internal memory that data that lower-position unit sends over deposit process control machine in, leakage point is accurately located and shows on display device according to localization method.
The signal processing unit in the step 3 wherein, the step of its processing data is as follows:
Step 1, stop the sonic sensor image data, and begin from storage unit, to take out acoustic wave 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 detection device 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.
Wherein the localization method in the step 4 is as follows, and when the GPRS transmission means that adopts based on ICP/IP protocol, under normal state, upper-position unit can receive that two acoustic signals that take place to leak detect the data that lower-position unit sends over, according to following formula:
Calculate
Size; In the formula
Expression n bugle call ripple input lower-position unit is apart from the distance of initial station upper-position unit;
Expression n-1 bugle call ripple input lower-position unit is apart from the distance of initial station upper-position unit;
The expression leakage point is apart from the distance of n bugle call ripple input lower-position unit;
The expression leakage point is apart from the distance of n+1 bugle call ripple input lower-position unit;
The velocity of propagation of expression suction wave in pipeline;
The expression sound wave is along the velocity of propagation of tube wall;
The expression acoustic signals arrives the moment of n bugle call ripple input lower-position unit;
The expression acoustic signals arrives the moment of n+1 bugle call ripple input lower-position unit;
The decline flex point that expression initial station suction wave produces constantly;
Represent pinpoint leakage information;
When wireless telecommunications occur unusually, only receive that the individual signals acoustic signals detects the data that lower-position unit is sent, when the initial station upper-position unit is only received the data that n bugle call ripple input lower-position unit sends, according to following formula:
Can accurately calculate
Size; And when the initial station upper-position unit is only received the data that n+1 bugle call ripple input lower-position unit sends, according to following formula:
Can accurately calculate
Size, other situations are 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; Navigation system has been avoided the big data quantity transmission, has improved the efficient of communication; The localization method that upper-position unit 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 flow chart of the present invention;
Fig. 4 is the prescribed form of data transmission of the present invention.
Embodiment
The present invention reaches embodiment in conjunction with the accompanying drawings and is described in detail.
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 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 is long for 360m in the present embodiment, is the simulated leakage position from initial station upper-position unit 140m wherein.Add an acoustic signals along pipeline every 90m and detect lower-position unit, like this, just respectively have an acoustic signals to detect lower-position unit in distance head and end 90m position.
The present invention, as shown in Figure 1, wherein acoustic signals detection lower-position unit comprises power supply unit, sonic sensor, signal condition unit, signal processing unit, GPS module and GPRS module; Described upper-position unit and uninterruptable power source; Described Pressure testing lower-position unit is intelligent high-speed real time data sampling device and pressure transducer;
The connection of this system: as shown in Figure 2, power supply unit connects the 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 navigation 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 process control machine, the output terminal of process control machine connects display device, uninterruptable power source connects process control machine, intelligent high-speed real time data sampling device and pressure transducer, the pressure transducer output terminal connects the input end of intelligent high-speed real time data sampling device, and the output terminal of intelligent high-speed real time data sampling device connects input end of industrial control machine.
The working procedure of this navigation system: pressure transducer is gathered pressure signal and is deposited database in, and sonic sensor collection acoustic signals enters signal processing unit after amplifying processing by the signal condition unit filtering, conversion deposits RAM in through A/D, stamps time tag simultaneously.When oil transport 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, decline flex point time difference that produces by the suction wave that detects the oil transport pipeline two ends and suction wave transmission velocity of wave can be determined the approximate location of leaking, and have also just determined to leak into the end to occur in which two acoustic signals and detect between the lower-position units.At this moment, the GPRS module of upper-position unit nearby detects the request of lower-position unit transmitting and receiving data to two acoustic signals of appointment, and awaits a response; After acoustic signals detection lower-position unit is received control signal, the actuating signal processing unit, stop the sonic sensor image data, and begin from the RAM of signal processing unit, to take out acoustic wave data one by one and do the small echo denoising according to the time inverted order, the warning value that the amplitude of the acoustic wave 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 determined 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 acoustic location 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 upper-position unit.Wireless communication mode adopts the GPRS communication modes based on ICP/IP protocol, and stamps time tag and device label in the packet that sends.Upper-position unit receives acoustic signals and detects the packet that lower-position unit is sent, become time and amplitude data to deposit the internal memory of process control machine in by protocol conversion, calculating the leakage point position accurately according to location algorithm shows on display device, and start radio communication unit once more locating information is sent on Line Leader'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 being achieved as follows:
Sonic sensor is collected extraneous various acoustic signals, requires the sensitivity of sensor and sample rate enough high, and power consumption simultaneously is low as far as possible, is installed on the oil transport pipeline and can collects the sound that leakage point sends, and acoustic signal is converted to electrical signal.The model that adopts in the system is Lance LC0107 series vibration transducer SN3563, cooperates the LC0207 [constant to use.
The GPS module for 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 is responsible for that mainly the electrical signal of sonic sensor output is carried out filtering and is amplified, and goes out sound frequency range and the signal to noise 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 by setting filtering frequency range and magnification factor, the most of noise of filtering.
Signal processing unit mainly is a dsp board, and the analogue 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 data buffer memory.When radio communication unit was received the control signal that upper-position unit 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 acoustic wave 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 finished 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, the transfer rate height, advantage such as always online, in order to prevent transmission delay, packet loss and multiple arrangement send to operating console 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 upper-position unit receives are situations 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, and 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 upper-position unit that is positioned at first and last two stations and detect lower-position units along several acoustic signals of piping layout and constitute.Upper-position unit will carry out cycle detection to each acoustic signals device every 6 hours, and the content of detection comprises: the communication situation of judgment means and upper-position unit if connect interruption or not smooth, rebulids connection; Whether the time of judging each detection device is consistent, with GPS system carried out time calibration at set intervals.Simultaneously, device proper 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 lower-position unit receives that upper-position unit sends, just can log-on data transmission terminal transmission packet; The GPRS module of detection device can become holding state again automatically after upper-position unit is finished the data reception.
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, in the ordinary course of things, arrive the decline flex point moment of the moment of detection device 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 this two class constantly 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, if it is roughly approaching with the moment of leaking by the generation that calculates that acoustic signals arrives the moment of detection device, 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 navigation 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 1, leak when pipeline, the pressure transducer of pipeline first and last end detects pressure and descends, computing time is poor, the velocity of propagation of suction wave in water is 1051.1m/s, the sample rate of pressure signal is 50Hz, and the detected time difference is 100ms, goes out the approximate location of leakage by above data rough calculation, the approximate location of leaking is apart from pipeline head end 127m, occurs between two acoustic signals detection lower-position units thereby determine to leak;
Step 2: upper-position unit nearby detects lower-position unit by 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 lower-position unit was received control signal, signal processing unit began processing data and passes through the data of GPRS module after described upper-position unit sends processing;
Step 3, lower-position unit begin to analyze data, and the information package that analyzes is dealt on the upper-position unit by the GPRS module, and the time difference is
2.9ms, the sample rate that acoustic signals detects lower-position unit is 10000Hz;
Step 4: upper-position unit receives acoustic signals and detects the internal memory that data that lower-position unit sends over deposit process control machine in, leakage point is accurately located and on display device, show according to localization method, the vibration that sound wave produces is 5232m/s along the velocity of propagation of water wall, by calculating, determine that the position location is 140.6m.
Claims (4)
1. pipe leakage navigation system that detects based on suction wave and sound wave synergic, the ducted leakage point of suction wave technology for detection based on routine, in the maneuvering room, first and last two station of a pipeline, establish upper-position unit and Pressure testing lower-position unit, it is characterized in that: establish acoustic signals every 0.5km～1km and detect lower-position unit on pipeline, described acoustic signals detects lower-position unit and comprises power supply unit, sonic sensor, signal condition unit, signal processing unit, GPS module and GPRS module; Described upper-position unit and uninterruptable power source; Described Pressure testing lower-position unit is intelligent high-speed real time data sampling device and pressure transducer;
Wherein power supply unit 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, GPRS module data transmission terminal sends pipe leakage information to process control machine, uninterruptable power source connects process control machine, intelligent high-speed real time data sampling device and pressure transducer, the pressure transducer output terminal connects the input end of intelligent high-speed real time data sampling device, and the output terminal of intelligent high-speed real time data sampling device connects input end of industrial control machine.
2. adopt the described method that positions based on the pipe leakage navigation system of suction wave and sound wave synergic detection of claim 1, it is characterized in that: carry out according to the following steps:
Step 1: detect the decline flex point that suction wave produces in the pipeline by pressure transducer, determine whether pipeline leaks the Position Approximate with leakage point, promptly judge to leak and occur in any two acoustic signals and detect between the lower-position units;
Step 2: upper-position unit nearby detects lower-position unit by 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 lower-position unit was received control signal, signal processing unit began processing data and passes through the data of GPRS module after described upper-position unit sends processing;
Step 4: upper-position unit receives acoustic signals and detects the internal memory that data that lower-position unit sends over deposit process control machine in, leakage point is accurately located and shows on display device according to localization method.
3. by the described method that positions based on the pipe leakage navigation system of suction wave and sound wave synergic detection of claim 2, it is characterized in that: signal processing unit in the described step 3, the step of its processing data is as follows:
Step 1, stop the sonic sensor image data, and begin from storage unit, to take out acoustic wave 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 detection device 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.
4. by the described method that positions based on the pipe leakage navigation system of suction wave and sound wave synergic detection of claim 2, it is characterized in that: the localization method in the described step 4 is as follows, when the GPRS transmission means that adopts based on ICP/IP protocol, under normal state, upper-position unit can receive that two acoustic signals that take place to leak detect the data that lower-position unit sends over, according to following formula:
Calculate
Size; In the formula
Expression n bugle call ripple input lower-position unit is apart from the distance of initial station upper-position unit;
Expression n-1 bugle call ripple input lower-position unit is apart from the distance of initial station upper-position unit;
The expression leakage point is apart from the distance of n bugle call ripple input lower-position unit;
The expression leakage point is apart from the distance of n+1 bugle call ripple input lower-position unit;
The velocity of propagation of expression suction wave in pipeline;
The expression sound wave is along the velocity of propagation of tube wall;
The expression acoustic signals arrives the moment of n bugle call ripple input lower-position unit;
The expression acoustic signals arrives the moment of n+1 bugle call ripple input lower-position unit;
The decline flex point that expression initial station suction wave produces constantly;
Represent pinpoint leakage information;
When wireless telecommunications occur unusually, only receive that the individual signals acoustic signals detects the data that lower-position unit is sent, when the initial station upper-position unit is only received the data that n bugle call ripple input lower-position unit sends, according to following formula:
Can accurately calculate
Size; And when the initial station upper-position unit is only received the data that n+1 bugle call ripple input lower-position unit sends, according to following formula:
Can accurately calculate
Size, other situations are in like manner.
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