CN106989282B - Virtual sound wave detection method and system for pipeline leakage - Google Patents
Virtual sound wave detection method and system for pipeline leakage Download PDFInfo
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- CN106989282B CN106989282B CN201710344106.7A CN201710344106A CN106989282B CN 106989282 B CN106989282 B CN 106989282B CN 201710344106 A CN201710344106 A CN 201710344106A CN 106989282 B CN106989282 B CN 106989282B
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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
- F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
Abstract
The invention relates to a virtual sound wave detection method for pipeline leakage, which comprises the following steps: a conduit upstream pressure signal and a conduit downstream pressure signal are obtained. And converting the pipeline upstream pressure signal and the pipeline downstream pressure signal into a pipeline upstream virtual sound wave signal and a pipeline downstream virtual sound wave signal. And if abnormal signals are detected in the virtual sound wave signals at the upstream of the pipeline and the virtual sound wave signals at the downstream of the pipeline, performing leakage positioning and alarming. The virtual sound wave signal is obtained by establishing a discretization mathematical model of the sound wave signal transmitter and taking the measured pressure signal as input. On the premise of not actually installing the sound wave signal transmitter, high-sensitivity detection of pipeline leakage is realized.
Description
Technical Field
The invention relates to the field of pipeline leakage detection, in particular to a method and a system for detecting pipeline leakage by virtual sound waves.
Background
In the pipeline leakage monitoring, a negative pressure wave method and a sound wave method are two methods which are most widely applied at home and abroad at present, the engineering implementation is simple and convenient, the cost is low, and the method has a perfect theoretical basis and rich field application examples. The acoustic wave method has high sensitivity and positioning accuracy for leak detection. The negative pressure wave principle is suitable for leak detection with obvious pressure drop, has low leak detection sensitivity and large positioning error, and can realize real-time monitoring of pressure change in the pipeline conveying process. If the pressure transmitter and the sound wave signal transmitter are simultaneously installed at two ends of the pipeline, the equipment cost and the information resource expenditure are increased. In the process of pipeline transportation, if on the premise of not actually installing the sound wave signal transmitter, the pressure real-time monitoring can be realized, the high-sensitivity detection of leakage can be realized, the system cost and information communication resources can be saved, and the practical application value is huge.
Disclosure of Invention
Therefore, it is necessary to provide a virtual acoustic wave detection method for pipeline leakage, aiming at the problem that the traditional scheme cannot realize real-time monitoring of pressure and high-sensitivity detection of leakage.
A virtual sound wave detection method for pipeline leakage comprises the following steps:
acquiring a pipeline upstream pressure signal and a pipeline downstream pressure signal;
converting the pipeline upstream pressure signal and the pipeline downstream pressure signal into a pipeline upstream virtual acoustic signal and a pipeline downstream virtual acoustic signal;
and if abnormal signals are detected in the pipeline upstream virtual sound wave signal and the pipeline downstream virtual sound wave signal, performing leakage positioning and alarming.
In one embodiment, the converting the pipe upstream pressure signal and the pipe downstream pressure signal into a pipe upstream virtual acoustic signal and a pipe downstream virtual acoustic signal includes:
establishing a mathematical model of the acoustic signal transmitter and discretizing;
and inputting the actually measured pressure signal into a mathematical model of the sound wave signal transmitter to obtain a virtual sound wave signal.
In one embodiment, the converting the pipe upstream pressure signal and the pipe downstream pressure signal into a pipe upstream virtual acoustic signal and a pipe downstream virtual acoustic signal includes:
establishing a mathematical model of the acoustic wave signal transmitter, wherein the mathematical model of the acoustic wave signal transmitter comprises the following steps: the device comprises three submodels, namely an acoustic wave sensor mathematical model, a charge amplification circuit mathematical model and a signal conditioning and transmitting circuit mathematical model;
converting the pipeline upstream pressure signal and the pipeline downstream pressure signal into a pipeline upstream charge signal and a pipeline downstream charge signal through the acoustic wave sensor mathematical model;
amplifying and converting the pipeline upstream charge signal and the pipeline downstream charge signal into a pipeline upstream voltage signal and a pipeline downstream voltage signal through the charge amplification circuit mathematical model;
and converting the pipeline upstream voltage signal and the pipeline downstream voltage signal into 4-20mA standard current signals through the signal conditioning and transmitting circuit mathematical model, and outputting the standard current signals, wherein the standard current signals are converted through a sampling resistor to obtain a pipeline upstream virtual sound wave signal and a pipeline downstream virtual sound wave signal.
In one embodiment, the converting, by the mathematical model of the signal conditioning and transmitting circuit, the pipeline upstream voltage signal and the pipeline downstream voltage signal into 4-20mA standard current signals for output, and converting, by sampling resistors, the pipeline upstream virtual acoustic wave signal and the pipeline downstream virtual acoustic wave signal respectively includes:
amplifying the pipeline upstream voltage signal and the pipeline downstream voltage signal to obtain an amplified pipeline upstream voltage signal and an amplified pipeline downstream voltage signal;
performing low-pass filtering processing on the amplified pipeline upstream voltage signal and the amplified pipeline downstream voltage signal to obtain a filtered pipeline upstream voltage signal and a filtered pipeline downstream voltage signal;
and performing voltage/current conversion and transmission processing on the filtered pipeline upstream voltage signal and the filtered pipeline downstream voltage signal to obtain a pipeline upstream 4-20mA standard current output signal and a pipeline downstream 4-20mA standard current output signal, and respectively converting through a sampling resistor to obtain a pipeline upstream virtual sound wave signal and a pipeline downstream virtual sound wave signal.
In one embodiment, converting the pipe upstream pressure signal and the pipe downstream pressure signal into a pipe upstream virtual acoustic signal and a pipe downstream virtual acoustic signal comprises:
establishing a sound wave signal transmitter mathematical model and discretizing to obtain a discretization mathematical model H (z), H (z) H of the sound wave signal transmitter1(z)*HA(z), wherein the acoustic signal transmitter mathematical model comprises an acoustic sensor mathematical model and a signal transmitter mathematical model, H1(z) is the discretized transfer function of the acoustic wave sensor, HA(z) is the discretized transfer function of the signal transmitter circuitry;
obtaining a virtual acoustic wave signal by a pressure-acoustic wave conversion formula y (z) ═ p (z) × h (z), where p (z) is a pipe upstream pressure signal or a pipe downstream pressure signal, and y (z) is a pipe upstream virtual acoustic wave signal or a pipe downstream virtual acoustic wave signal.
In one embodiment, if an abnormal signal is detected in both the pipeline upstream virtual acoustic signal and the pipeline downstream virtual acoustic signal, leakage positioning and alarming are performed.
A virtual acoustic detection system for pipeline leaks, comprising:
the pressure acquisition device is used for acquiring a pipeline upstream pressure signal and a pipeline downstream pressure signal;
the acoustic signal transmitter mathematical model is used for converting the pipeline upstream pressure signal and the pipeline downstream pressure signal into a pipeline upstream virtual acoustic signal and a pipeline downstream virtual acoustic signal through the acoustic signal transmitter mathematical model;
and the abnormal signal detection, leakage positioning and alarm device is used for performing leakage positioning and alarm if the pipeline upstream virtual sound wave signal and the pipeline downstream virtual sound wave signal both detect abnormal signals.
In one embodiment, the acoustic signal transmitter mathematical model comprises:
the method comprises the following steps that (1) an acoustic wave sensor mathematical model, a charge amplifier mathematical model and a signal conditioning and transmitting circuit mathematical model are adopted;
the acoustic wave sensor mathematical model is used for converting a pipeline upstream pressure signal and a pipeline downstream pressure signal into a pipeline upstream charge signal and a pipeline downstream charge signal;
the charge amplification circuit mathematical model is used for amplifying and converting a pipeline upstream charge signal and a pipeline downstream charge signal into a pipeline upstream voltage signal and a pipeline downstream voltage signal;
the signal conditioning and transmitting circuit mathematical model is used for converting the pipeline upstream voltage signal and the pipeline downstream voltage signal into pipeline upstream 4-20mA standard current and pipeline downstream 4-20mA standard current output signals, and respectively converting the signals through sampling resistors to obtain a pipeline upstream virtual sound wave signal and a pipeline downstream virtual sound wave signal.
In one embodiment, the signal conditioning transmitter circuit mathematical model comprises:
the device comprises a first signal amplifying unit, a signal filtering unit and a signal transmitting unit;
the first signal amplification unit is used for amplifying the pipeline upstream voltage signal and the pipeline downstream voltage signal to obtain an amplified pipeline upstream voltage signal and an amplified pipeline downstream voltage signal;
the signal filtering unit is used for carrying out low-pass filtering processing on the amplified pipeline upstream voltage signal and the amplified pipeline downstream voltage signal to obtain a filtered pipeline upstream voltage signal and a filtered pipeline downstream voltage signal;
and the signal transmitting unit is used for performing voltage/current conversion and transmission processing on the filtered pipeline upstream voltage signal and the filtered pipeline downstream voltage signal to obtain a pipeline upstream 4-20mA standard current and a pipeline downstream 4-20mA standard current output signal, and respectively converting through a sampling resistor to obtain a pipeline upstream virtual sound wave signal and a pipeline downstream virtual sound wave signal.
In one embodiment, the signal conditioning and transmitting module further includes:
and the second signal amplification unit is used for carrying out second amplification processing on the filtered pipeline upstream voltage signal and the filtered pipeline downstream voltage signal.
The pipeline leakage virtual sound wave detection method is provided. A conduit upstream pressure signal and a conduit downstream pressure signal are obtained. And converting the pipeline upstream pressure signal and the pipeline downstream pressure signal into a pipeline upstream virtual sound wave signal and a pipeline downstream virtual sound wave signal. And if the pipeline upstream virtual sound wave signal and the pipeline downstream virtual sound wave signal both detect abnormal signals, performing leakage positioning and alarming. The method comprises the steps of converting a measured pressure signal into a virtual sound wave signal, and then carrying out abnormal signal detection, leakage positioning and alarming on the virtual sound wave signal. Namely, the measured pressure signal is used as input to obtain a virtual sound wave signal, and then abnormal signal detection, leakage positioning and alarm are carried out on the virtual sound wave signal. On the premise of not actually installing the sound wave signal transmitter, high-sensitivity detection of pipeline leakage is realized.
Drawings
FIG. 1 is a flow chart of a virtual acoustic wave detection method for detecting pipeline leakage according to an embodiment of the present invention;
fig. 2 is a schematic block diagram illustrating a principle of acquiring a virtual acoustic wave signal in a method for detecting a virtual acoustic wave leakage of a pipeline according to an embodiment of the present invention;
FIG. 3a is a time domain waveform diagram of the pressure of the pipeline leakage virtual sound wave detection method under the normal working condition of the pipeline section according to an embodiment of the present invention;
FIG. 3b is a time domain waveform of a virtual acoustic wave signal derived from the pressure signal of FIG. 3a according to an embodiment of the present invention;
FIG. 4a is a time domain waveform diagram of the pressure of the pipeline leakage virtual sound wave detection method under the abnormal working condition of the pipeline section according to an embodiment of the present invention;
FIG. 4b is a time domain waveform of a virtual acoustic wave signal derived from the pressure signal of FIG. 4a according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a virtual acoustic wave detection system for detecting pipeline leakage according to an embodiment of the present invention.
The reference numbers illustrate:
virtual acoustic wave detection system 10 for pipeline leakage
Acoustic signal transmitter mathematical model 200
Leak location and alarm device 300
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the method for detecting a pipeline leakage virtual acoustic wave according to the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the embodiments described herein are merely illustrative of the invention, and are not intended to limit the invention, such as the type of acoustic wave sensor, the configuration of the signal transmitter circuit, and the parameters of the components in the circuit.
Referring to fig. 1, a method for detecting a pipeline leakage by virtual sound waves includes the following steps:
s102, acquiring a pipeline upstream pressure signal and a pipeline downstream pressure signal;
one pressure acquisition device 100 is installed upstream of the pipe and downstream of the pipe, respectively. The pressure signals upstream of the pipeline and downstream of the pipeline are continuously monitored in real time by the pressure acquisition device 100. Upstream of the pipe may be understood as a position at a distance from the outlet of the pump and downstream of the pipe may be understood as a position at a distance from the inlet of the tank. The specific distance can be set according to the length of the pipeline.
S104, converting the pipeline upstream pressure signal and the pipeline downstream pressure signal into a pipeline upstream virtual sound wave signal and a pipeline downstream virtual sound wave signal;
and establishing a mathematical model 200 of the acoustic wave signal transmitter. The acoustic signal transmitter mathematical model 200 can be obtained through experimental modeling or mechanism modeling. Different acoustic wave sensors are selected and different circuit design concepts are possessed, different charge amplification and signal conditioning transmitting circuit structures and electrical parameters can be obtained, and different mathematical models are finally obtained. The acoustic signal transmitter mathematical model 200 is established for the purpose of the application. The acoustic signal transmitter mathematical model 200 can realize conversion from a measured pressure signal to a virtual acoustic signal.
And S106, if abnormal signals are detected in the pipeline upstream virtual sound wave signal and the pipeline downstream virtual sound wave signal, performing leakage positioning and alarming.
And detecting whether the virtual sound wave signals at the upstream of the pipeline and the virtual sound wave signals at the downstream of the pipeline contain abnormal signals. The specific detection judgment method and the leak location method may be one of various methods.
In the embodiment, a method for detecting pipeline leakage by using virtual sound waves is provided. And obtaining a virtual sound wave signal by taking the actually measured pressure signal as input through a mathematical model of the sound wave signal transmitter. And then carrying out abnormal signal detection, leakage positioning and alarming on the virtual sound wave signals. On the premise of not actually installing the sound wave signal transmitter, high-sensitivity detection of pipeline leakage is realized. In this embodiment, the design idea of converting a pressure signal into a virtual sound wave signal is applied, and the concrete mathematical model of the sound wave signal transmitter and the obtaining method thereof are not required to be consistent. Any design concept applied to convert a pressure signal into a virtual acoustic signal is within the scope of the present application.
In one embodiment, the virtual acoustic wave detection method for pipeline leakage comprises the following steps:
s202, installing a pressure transmitter with the same type and the same precision grade at two ends of the pipeline respectively.
The two ends of the pipeline are the initial station and the final station of the pipeline, namely the upstream of the pipeline and the downstream of the pipeline. The mounting position of the pressure transmitter may be set at a distance from the upstream outlet of the pipe and the downstream inlet of the pipe. And installing the same-type pressure transmitters with the same precision grade to obtain the virtual sound wave signals with the same precision grade according to the obtained pressure transmitter signals.
And S204, establishing a sound wave signal transmitter mathematical model 200. The acoustic wave signal transmitter is characterized by specifically selecting an acoustic wave sensor and a designed signal transmitter circuit for the acoustic wave signal transmitter in engineering practice. And establishing a sound wave signal transmitter mathematical model 200 and discretizing to obtain a discretization mathematical model H (z) of the sound wave signal transmitter.
The transfer function of the acoustic wave sensor is H1(s) the transfer function of the signal transmitter circuitry is HA(s). An acoustic signal transducer mathematical model 200 is created from the acoustic sensor and signal transducer circuitry and discretized. Obtaining a transfer function H (z) H of the mathematical model 200 of the acoustic signal transmitter1(z)*HA(z)。
And S206, continuously monitoring the pressure signals of the first station and the last station of the pipeline in real time in a certain sampling period. And (3) each frame (containing N point data, wherein N is a positive integer) of the pressure signals P (z) of the first station and the last station of the pipeline is obtained and is used as the input of the discretization mathematical model of the acoustic wave signal transmitter. Virtual acoustic wave signals y (z) of the first station and the last station of the pipeline are obtained by a pressure-acoustic wave conversion formula y (z) p (z) x h (z), respectively.
And S208, detecting abnormal signals of the virtual sound wave signals of the first station and the last station of the pipeline. And if the virtual sound wave signals of the first station and the last station of the pipeline contain abnormal signals, further performing leakage positioning and alarming.
In the embodiment, a virtual sound wave detection method for pipeline leakage is provided, and a virtual sound wave signal is obtained by establishing a discretization mathematical model of a sound wave signal transmitter and taking an actually measured pressure signal as input. On the premise of not actually installing the sound wave signal transmitter, high-sensitivity detection of pipeline leakage is realized.
In order to more clearly illustrate the present invention, the method for detecting a pipe leakage by virtual sound wave according to the present invention is further described below with reference to a specific example. Embodiments of the present invention may be implemented in any programming language and operate on a corresponding computer.
The composition structure of the acoustic signal transmitter in the block diagram is schematically illustrated according to the virtual acoustic signal acquisition principle in the pipeline leakage virtual acoustic detection method shown in fig. 2. Sensitivity K of acoustic wave sensors53480pC/MPa replaces the mathematical model of the acoustic wave sensor; when the total gain of the voltage primary amplification circuit, the voltage secondary amplification circuit and the V/I conversion circuit is K-6; the passband frequency is 0.03-20.4 Hz; discretized sampling frequency fsWhen the frequency is 100Hz, the discretization mathematical model of the corresponding acoustic signal transmitter is as follows:
according to the flow chart shown in fig. 1, the pipeline pressure actually collected on site is used as input, and the input is input into a pressure-sound wave conversion formula y (z) ═ p (z) × h (z), so as to obtain a corresponding virtual sound wave signal. And when detecting that the virtual sound wave signals of the first station and the last station of the pipeline contain abnormal signals, performing leakage positioning and alarming. Fig. 3a is a measured pressure signal obtained under normal operating conditions. Fig. 3b is a normal virtual acoustic signal obtained by passing the pressure signal through the above pressure-acoustic conversion formula under the normal working condition. Fig. 4a shows the measured pressure signal obtained under abnormal conditions. Fig. 4b is an abnormal virtual acoustic signal obtained by passing the pressure signal through the above pressure-acoustic conversion formula under the abnormal working condition. (in fig. 3a, 3b, 4a and 4b, the length N of one frame signal is 9000, and the sampling resistance is 250 ohms for 2 minutes of historical data and 1 minute of measured data).
In one embodiment, the converting the pipe upstream pressure signal and the pipe downstream pressure signal into a pipe upstream virtual acoustic signal and a pipe downstream virtual acoustic signal includes:
establishing a mathematical model of the acoustic signal transmitter and discretizing;
and inputting the actually measured pressure signal into a mathematical model of the sound wave signal transmitter to obtain a virtual sound wave signal.
In this embodiment, the mathematical model 200 of the acoustic wave signal transmitter includes: the device comprises an acoustic wave sensor mathematical model, a charge amplification circuit mathematical model and a signal conditioning and transmitting circuit mathematical model. The acoustic signal transducer mathematical model 200 is employed to effect conversion from a measured pressure signal to a virtual acoustic signal.
In one embodiment, the converting the pipe upstream pressure signal and the pipe downstream pressure signal into a pipe upstream virtual acoustic signal and a pipe downstream virtual acoustic signal includes:
establishing a mathematical model of the acoustic wave signal transmitter, wherein the mathematical model of the acoustic wave signal transmitter comprises the following steps: the device comprises three submodels, namely an acoustic wave sensor mathematical model, a charge amplification circuit mathematical model and a signal conditioning and transmitting circuit mathematical model;
converting the pipeline upstream pressure signal and the pipeline downstream pressure signal into a pipeline upstream charge signal and a pipeline downstream charge signal through the acoustic wave sensor mathematical model;
amplifying and converting the pipeline upstream charge signal and the pipeline downstream charge signal into a pipeline upstream voltage signal and a pipeline downstream voltage signal through the charge amplification circuit mathematical model;
and converting the pipeline upstream voltage signal and the pipeline downstream voltage signal into a pipeline upstream standard 4-20mA output signal and a pipeline downstream standard 4-20mA output signal through the signal conditioning and transmitting circuit mathematical model, and converting the signals through a sampling resistor to obtain a pipeline upstream virtual sound wave signal and a pipeline downstream virtual sound wave signal respectively.
In one embodiment, the converting the pipeline upstream voltage signal and the pipeline downstream voltage signal into a pipeline upstream virtual acoustic wave signal and a pipeline downstream virtual acoustic wave signal by the signal conditioning transmitting circuit mathematical model includes:
amplifying the pipeline upstream voltage signal and the pipeline downstream voltage signal to obtain an amplified pipeline upstream voltage signal and an amplified pipeline downstream voltage signal;
performing low-pass filtering processing on the amplified pipeline upstream voltage signal and the amplified pipeline downstream voltage signal to obtain a filtered pipeline upstream voltage signal and a filtered pipeline downstream voltage signal;
and performing voltage/current conversion and transmission processing on the filtered pipeline upstream voltage signal and the filtered pipeline downstream voltage signal to obtain a pipeline upstream standard 4-20mA output signal and a pipeline downstream standard 4-20mA output signal, and respectively converting through a sampling resistor to obtain a pipeline upstream virtual sound wave signal and a pipeline downstream virtual sound wave signal.
Converting the pipe upstream pressure signal and the pipe downstream pressure signal into a pipe upstream virtual acoustic signal and a pipe downstream virtual acoustic signal, comprising:
establishing a sound wave signal transmitter mathematical model 200 and discretizing to obtain a discretization mathematical model H (z), H (z) of the sound wave signal transmitter1(z)*HA(z), wherein the acoustic signal transducer mathematical model 200 comprises an acoustic sensor and signal transducer circuit mathematical model, H1(z) is the discretized transfer function of the acoustic wave sensor, HA(z) is the discretized transfer function of the signal transmitter circuitry;
obtaining a virtual acoustic wave signal by a pressure-acoustic wave conversion formula y (z) ═ p (z) × h (z), where p (z) is a pipe upstream pressure signal or a pipe downstream pressure signal, and y (z) is a pipe upstream virtual acoustic wave signal or a pipe downstream virtual acoustic wave signal.
In one embodiment, if the virtual acoustic wave signal at the upstream of the pipeline and the virtual acoustic wave signal at the downstream of the pipeline both detect that an abnormal signal is contained, leakage positioning and alarming are carried out.
Referring to fig. 5, a virtual acoustic wave detection system 10 for pipeline leakage includes:
a pressure acquisition device 100 for acquiring a pipeline upstream pressure signal and a pipeline downstream pressure signal;
the acoustic signal transmitter mathematical model 200 is used for converting the pipeline upstream pressure signal and the pipeline downstream pressure signal into a pipeline upstream virtual acoustic signal and a pipeline downstream virtual acoustic signal through the acoustic signal transmitter mathematical model 200;
the abnormal signal detecting and leakage positioning and alarming device 300 performs leakage positioning and alarming when an abnormal signal is detected in both the pipeline upstream virtual acoustic signal and the pipeline downstream virtual acoustic signal.
In one embodiment, the acoustic signal transmitter mathematical model 200 includes:
the device comprises an acoustic wave sensor mathematical model, a charge amplification circuit mathematical model and a signal conditioning and transmitting circuit mathematical model;
the acoustic wave sensor mathematical model is used for converting a pipeline upstream pressure signal and a pipeline downstream pressure signal into a pipeline upstream charge signal and a pipeline downstream charge signal;
the charge amplification circuit mathematical model is used for amplifying and converting a pipeline upstream charge signal and a pipeline downstream charge signal into a pipeline upstream voltage signal and a pipeline downstream voltage signal;
the signal conditioning and transmitting circuit mathematical model is used for converting the pipeline upstream voltage signal and the pipeline downstream voltage signal into a pipeline upstream standard 4-20mA output signal and a pipeline downstream standard 4-20mA output signal, and respectively converting the signals through a sampling resistor to obtain a pipeline upstream virtual sound wave signal and a pipeline downstream virtual sound wave signal.
In one embodiment, the signal conditioning transmitter circuit mathematical model comprises:
the device comprises a first signal amplifying unit, a signal filtering unit and a signal transmitting unit;
the first signal amplification unit is used for amplifying the pipeline upstream voltage signal and the pipeline downstream voltage signal to obtain an amplified pipeline upstream voltage signal and an amplified pipeline downstream voltage signal;
the signal filtering unit is used for carrying out low-pass filtering processing on the amplified pipeline upstream voltage signal and the amplified pipeline downstream voltage signal to obtain a filtered pipeline upstream voltage signal and a filtered pipeline downstream voltage signal;
and the signal transmitting unit is used for performing voltage/current conversion and transmission processing on the filtered pipeline upstream voltage signal and the filtered pipeline downstream voltage signal to obtain a pipeline upstream standard 4-20mA output signal and a pipeline downstream standard 4-20mA output signal, and respectively converting through a sampling resistor to obtain a pipeline upstream virtual sound wave signal and a pipeline downstream virtual sound wave signal.
In one embodiment, the signal conditioning transmitter circuit mathematical model further comprises:
and the second signal amplification unit is used for carrying out second amplification processing on the filtered pipeline upstream voltage signal and the filtered pipeline downstream voltage signal.
In one embodiment, the pipe leak detection system 10 further comprises: abnormal signal detection, leakage positioning and alarming devices.
And the abnormal signal detection, leakage positioning and alarm device is used for performing leakage positioning and early warning when abnormal signals are detected in the pipeline upstream virtual sound wave signal and the pipeline downstream virtual sound wave signal.
The sensor type, the transmitter circuit composition structure and the corresponding electrical parameters of the acoustic wave signal transmitter provided by the embodiment of the invention can be changed according to the actual application or expected use of the acoustic wave sensor type, the circuit composition structure and the response characteristics, and the corresponding sampling frequency can also be changed.
Finally, it should be noted that it is obvious that various changes and modifications can be made to the present invention by those skilled in the art without departing from the spirit and scope of the present invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. A virtual sound wave detection method for pipeline leakage is characterized by comprising the following steps:
acquiring a pipeline upstream pressure signal and a pipeline downstream pressure signal;
converting the pipeline upstream pressure signal and the pipeline downstream pressure signal into a pipeline upstream virtual acoustic signal and a pipeline downstream virtual acoustic signal;
if the pipeline upstream virtual sound wave signal and the pipeline downstream virtual sound wave signal both detect abnormal signals, performing leakage positioning and alarming;
the converting the pipe upstream pressure signal and the pipe downstream pressure signal into a pipe upstream virtual acoustic signal and a pipe downstream virtual acoustic signal comprises:
establishing a mathematical model H(s), H(s) H of the sound wave signal transmitter1(s)×HA(s), wherein the acoustic signal transmitter mathematical model comprises a mathematical model of an acoustic sensor and signal transmitter circuitry, H1(s) is the transfer function of the acoustic wave sensor, HA(s) is a transfer function of the signal transmitter circuitry; and discretizing H(s) to obtain discretized mathematical model H (z), H (z) H1(z)*HA(z) wherein H1(z) is the discretized transfer function of the acoustic wave sensor, HA(z) A discretized transfer function for the signal transmitter circuitry;
obtaining a virtual acoustic wave signal by a pressure-acoustic wave conversion formula y (z) ═ p (z) × h (z), where p (z) is a pipe upstream pressure signal or a pipe downstream pressure signal, and y (z) is a pipe upstream virtual acoustic wave signal or a pipe downstream virtual acoustic wave signal.
2. The method for virtual acoustic pipe leak detection as set forth in claim 1, wherein said converting said pipe upstream pressure signal and said pipe downstream pressure signal into a pipe upstream virtual acoustic signal and a pipe downstream virtual acoustic signal comprises:
establishing a mathematical model of the acoustic wave signal transmitter, wherein the mathematical model of the acoustic wave signal transmitter comprises the following steps: the device comprises three submodels, namely an acoustic wave sensor mathematical model, a charge amplification circuit mathematical model and a signal conditioning and transmitting circuit mathematical model;
converting the pipeline upstream pressure signal and the pipeline downstream pressure signal into a pipeline upstream charge signal and a pipeline downstream charge signal through the acoustic wave sensor mathematical model;
amplifying and converting the pipeline upstream charge signal and the pipeline downstream charge signal into a pipeline upstream voltage signal and a pipeline downstream voltage signal through the charge amplification circuit mathematical model;
and converting the pipeline upstream voltage signal and the pipeline downstream voltage signal through the signal conditioning and transmitting circuit mathematical model to obtain a pipeline upstream 4-20mA standard current output signal and a pipeline downstream 4-20mA standard current output signal, and converting through a sampling resistor to obtain a pipeline upstream virtual sound wave signal and a pipeline downstream virtual sound wave signal respectively.
3. The method for detecting pipeline leakage virtual sound wave according to claim 2, wherein the converting the pipeline upstream voltage signal and the pipeline downstream voltage signal into a pipeline upstream 4-20mA standard current output signal and a pipeline downstream 4-20mA standard current output signal through the signal conditioning and transmitting circuit mathematical model, and respectively converting the pipeline upstream virtual sound wave signal and the pipeline downstream virtual sound wave signal through sampling resistors comprises:
amplifying the pipeline upstream voltage signal and the pipeline downstream voltage signal to obtain an amplified pipeline upstream voltage signal and an amplified pipeline downstream voltage signal;
performing low-pass filtering processing on the amplified pipeline upstream voltage signal and the amplified pipeline downstream voltage signal to obtain a filtered pipeline upstream voltage signal and a filtered pipeline downstream voltage signal;
and performing voltage/current conversion transmission processing on the filtered pipeline upstream voltage signal and the filtered pipeline downstream voltage signal to obtain a pipeline upstream 4-20mA standard current output signal and a pipeline downstream 4-20mA standard current output signal, and respectively converting through a sampling resistor to obtain a pipeline upstream virtual sound wave signal and a pipeline downstream virtual sound wave signal.
4. A virtual acoustic detection system for pipeline leaks, comprising:
the pressure acquisition device is used for acquiring a pipeline upstream pressure signal and a pipeline downstream pressure signal;
the acoustic signal transmitter mathematical model is used for converting the pipeline upstream pressure signal and the pipeline downstream pressure signal into a pipeline upstream virtual acoustic signal and a pipeline downstream virtual acoustic signal through the acoustic signal transmitter mathematical model; the acoustic signal transmitter mathematical model converts the pipeline upstream pressure signal and the pipeline downstream pressure signal into a pipeline upstream virtual acoustic signal and a pipeline downstream virtual acoustic signal through the acoustic signal transmitter mathematical model, and the acoustic signal transmitter mathematical model comprises the following steps: establishing a mathematical model H(s), H(s) H of the sound wave signal transmitter1(s)×HA(s), wherein the acoustic signal transmitter mathematical model comprises a mathematical model of an acoustic sensor and signal transmitter circuitry, H1(s) is the transfer function of the acoustic wave sensor, HA(s) is a transfer function of the signal transmitter circuitry; and discretizing H(s) to obtain discretized mathematical model H (z), H (z) H1(z)*HA(z) wherein H1(z) is the discretized transfer function of the acoustic wave sensor, HA(z) is the discretized transfer function of the signal transmitter circuitry; obtaining a virtual acoustic wave signal by a pressure-acoustic wave conversion formula y (z) ═ p (z) × h (z), where p (z) is a pipe upstream pressure signal or a pipe downstream pressure signal, and y (z) is a pipe upstream virtual acoustic wave signal or a pipe downstream virtual acoustic wave signal;
and the abnormal signal detection and leakage positioning and alarming device is used for performing leakage positioning and alarming when abnormal signals are detected in the pipeline upstream virtual sound wave signal and the pipeline downstream virtual sound wave signal.
5. The virtual acoustic pipe leak detection system of claim 4, wherein the acoustic signal transmitter mathematical model comprises:
the device comprises an acoustic wave sensor mathematical model, a charge amplification circuit mathematical model and a signal conditioning and transmitting circuit mathematical model;
the acoustic wave sensor mathematical model is used for converting a pipeline upstream pressure signal and a pipeline downstream pressure signal into a pipeline upstream charge signal and a pipeline downstream charge signal;
the charge amplification circuit mathematical model is used for amplifying and converting a pipeline upstream charge signal and a pipeline downstream charge signal into a pipeline upstream voltage signal and a pipeline downstream voltage signal;
the signal conditioning and transmitting circuit mathematical model is used for converting the pipeline upstream voltage signal and the pipeline downstream voltage signal into a pipeline upstream 4-20mA standard current output signal and a pipeline downstream 4-20mA standard current output signal, and respectively converting the signals through sampling resistors to obtain a pipeline upstream virtual sound wave signal and a pipeline downstream virtual sound wave signal.
6. The virtual acoustic pipe leak detection system of claim 5, wherein the signal conditioning transmitter circuit mathematical model comprises:
the device comprises a first signal amplifying unit, a signal filtering unit and a signal transmitting unit;
the first signal amplification unit is used for amplifying the pipeline upstream voltage signal and the pipeline downstream voltage signal to obtain an amplified pipeline upstream voltage signal and an amplified pipeline downstream voltage signal;
the signal filtering unit is used for carrying out low-pass filtering processing on the amplified pipeline upstream voltage signal and the amplified pipeline downstream voltage signal to obtain a filtered pipeline upstream voltage signal and a filtered pipeline downstream voltage signal;
and the signal transmitting unit is used for performing voltage/current conversion transmitting processing on the filtered pipeline upstream voltage signal and the filtered pipeline downstream voltage signal to obtain a pipeline upstream 4-20mA standard current output signal and a pipeline downstream 4-20mA standard current output signal, and respectively converting through a sampling resistor to obtain a pipeline upstream virtual sound wave signal and a pipeline downstream virtual sound wave signal.
7. The virtual acoustic pipe leak detection system of claim 6, wherein the signal conditioning transmitter circuit mathematical model further comprises:
and the second signal amplification unit is used for carrying out second amplification processing on the filtered pipeline upstream voltage signal and the filtered pipeline downstream voltage signal.
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