Underground pipeline searching method and device based on multi-element frequency conversion vibration source
Through the combination of multiple variable frequency vibration sources and sensor arrays, the problem of signal attenuation and interference of underground pipeline pipe search method under different geological conditions is solved, and high-precision and high-reliability pipeline detection is achieved. It is suitable for a variety of media environments and simplifies the operation process.
Patent Information
- Application Number
- CN202510108933.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-23
- Publication Date
- 2025-05-06
AI Technical Summary
The existing underground pipeline pipe search method has severe signal attenuation and interference under different geological conditions, resulting in low detection accuracy and difficulty in adapting to various media environments. It has complex operation and high threshold.
Using a method of combining multiple variable frequency vibration sources and sensor arrays, by constructing a coordinate system and laying a sensor array, applying vibration signals with gradually increasing amplitude and frequency, determining the vibration source signals of specific amplitude and specific frequency, performing fast Fourier transformation and energy calculations, and accurately determining the pipeline direction.
It improves the effectiveness and stability of the signal, improves detection accuracy, and can accurately indicate the pipeline direction in different media environments, simplifies the result interpretation process, and reduces the difficulty of operation.
Smart Images
Figure CN119936964A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of underground pipeline locating, and in particular to an underground pipeline locating method and device based on a multi-element variable frequency vibration source. Background Art
[0002] At present, the main methods for finding pipelines are: machine camera detection method, geographic information system detection method, and sound wave detection method. The machine camera detection method mainly relies on the robot dog with an external camera to detect the pipeline. The operator observes and records the internal direction of the pipeline in real time, but the pipeline needs to be open, water-free, and unobstructed, and there are certain requirements for the diameter of the pipeline. The geographic information system detection method mainly uses GIS technology, combined with known pipeline data and geographic spatial data, to conduct spatial analysis and simulation of underground pipelines to help determine the location and direction of the pipeline. This method requires accurate pipeline drawing information within a certain range for assistance. However, during the construction of underground water supply pipelines, due to factors such as changes in pipeline planning plans and changes in construction team leaders, it is often difficult to ensure the accuracy of pipeline drawing information, resulting in a significant reduction in the accuracy of this method. At the same time, the use of this method requires certain professional knowledge and related skills to operate, which further limits the use of this method.
[0003] The acoustic wave detection method relies on acoustic wave transmitters and acoustic wave receivers to detect underground water supply pipes based on the characteristics of acoustic wave propagation in different media. However, this method must ensure the effective propagation of acoustic waves during use. Different soil or non-soil media require the use of corresponding types of acoustic wave generators. At the same time, the fluid inside the pipe must be emptied and the pipe must be unblocked to ensure the effectiveness and accuracy of the method. This condition also makes the application of this method extremely limited.
[0004] Therefore, different pipe materials, different pipe diameters, whether the pipe is empty, whether the pipe is blocked, and different media on the ground directly or indirectly limit the accuracy of underground pipe detection, resulting in misjudgment. The detection accuracy of traditional underground pipe detection methods is limited, and it is difficult to accurately determine the actual direction of the pipeline, especially under complex geological conditions (such as soil, rock, concrete ground, etc.); it is impossible to effectively distinguish between pipeline signals and interference signals from the surrounding medium, leading to misjudgment; in addition, the traditional underground pipe detection method has poor adaptability to different media and cannot work stably in a variety of environments. In summary, the market is in urgent need of an underground pipeline detection method and device that can adapt to a variety of media environments, with high accuracy and high reliability. Summary of the invention
[0005] In response to the above problems, a method and device for finding underground pipelines based on a multi-element variable frequency vibration source is provided. By constructing a coordinate system and arranging a sensor array, different directions are fully covered to ensure the comprehensiveness of signal acquisition. By applying a vibration signal with gradually increasing amplitude and frequency, and determining a vibration source signal with a specific amplitude and specific frequency, the problem of signal attenuation and interference under different geological conditions is solved, so that the system can find the most suitable vibration parameters for propagation in different medium environments, thereby improving the effectiveness and stability of the signal and thus improving the detection accuracy. By synchronously collecting the vibration signal S r ( t ) is converted into frequency domain signal by fast Fourier transform (FFT) X r ( w ), and calculate the energy of each sensor E r , combining the highest and second highest energy sensor positions to accurately determine and indicate the pipeline direction in a more intuitive way.
[0006] To achieve the above object, the technical solution adopted by the present invention is: a method for finding underground pipelines based on a multi-element variable frequency vibration source, comprising the following steps: Step 1: Take the multi-element variable frequency vibration source as the origin and the east direction as the x Axis, due north is y Axis Construction xoy Coordinate system; then take the multivariate variable frequency vibration source as the origin and the radius as r Even and symmetrical layout4 n +4 sensors for collecting vibration source signals form a sensor array; Step 2: Start the multi-element variable frequency vibration source, apply vibration signals with amplitudes and frequencies from small to large to the multi-element variable frequency vibration source through a signal generator to drive the multi-element variable frequency vibration source to generate vibrations, and when the sensor stably collects the multi-element variable frequency vibration signal, determine the specific amplitude and specific frequency of the vibration source signal corresponding to the multi-element variable frequency vibration source in a specific medium; Step 3: The sensor array synchronously collects the multivariate variable frequency vibration source from the distance r of 4 n +4 vibration signals in different directions S r ( t ): S r ( t )= Asin (2 πf * t )= Asin ( w * t ) in,r is the distance between the sensor and the multivariate frequency-converting vibration source; A It is the amplitude of the adjustable vibration source signal under a specific ground medium; f It is the frequency of the adjustable vibration source signal in a specific ground medium; w is the angular frequency of the adjustable vibration source signal in a specific ground medium; Step 4: For the vibration source signal in step 3 S r ( t ) to perform fast Fourier transform to obtain the corresponding signal frequency domain X r ( w ): in, t Indicates time; w is the angular frequency of the source signal; i is an imaginary unit; Step 5: Based on the signal frequency domain in step 4 X r ( w ) respectively calculate the 4 n +4 different azimuth sensor energy E r : Step 6: Connect the sensors with the highest energy and the second highest energy in the sensor array to the multi-element variable frequency vibration source respectively, so as to accurately obtain the actual underground direction of the pipeline to be tested.
[0007] Preferably, the vibration source signal of the specific amplitude and specific frequency in step 2 propagates along both sides of the wall of the pipeline to be measured or both sides of the fluid in the pipeline, and simultaneously radiates in an attenuated manner to all orientation sensors under the specific medium.
[0008] Preferably, the specific medium includes soil, rock, muddy soil, cement floor, brick and stone and asphalt pavement.
[0009] Preferably, the multi-element variable frequency vibration source is installed at the bottom of a fire hydrant, a pipeline valve or a surface of a metal pipeline.
[0010] Preferably, when the specific medium is soil, the vibration source signal is collected by inserting a leak detection rod into the ground by 15 cm and setting a sensor at the top of the leak detection rod.
[0011] Preferably, when the specific medium is not soil, the sensor is directly set at a corresponding position on the surface to collect the vibration source signal.
[0012] Preferably, the distance between the sensor and the multivariate variable frequency vibration source isr ≥0.3m.
[0013] Preferably, the distance between the sensor and the multivariate variable frequency vibration source is r is 1m.
[0014] Preferably, there are 8 sensors in the sensor array, which are respectively arranged in 8 directions: due east, due south, due west, due north, southeast, southwest, northwest, and northeast.
[0015] An underground pipeline search device based on a multi-element variable frequency vibration source comprises a signal generator, a multi-element variable frequency vibration source, a sensor for collecting a vibration source signal emitted by the multi-element variable frequency vibration source, and a data processing module for data processing; the signal generator generates a driving signal to drive the multi-element variable frequency vibration source to generate a vibration signal with amplitude and frequency from small to large, and when the sensors uniformly and symmetrically arranged with the multi-element variable frequency vibration source as the center can stably collect the multi-element variable frequency vibration signal, the specific amplitude and specific frequency of the vibration source signal corresponding to the multi-element variable frequency vibration source under a specific medium are determined; the vibration source signal propagates along both sides of the wall of the pipeline to be measured or both sides of the fluid in the pipeline, and at the same time radiates to each sensor under the specific medium in an attenuated manner, the sensor synchronously collects the vibration source signal, and outputs the collected vibration source signal to the data processing module, and the data processing module uses the underground pipeline search method to accurately output the actual underground direction of the pipeline to be measured.
[0016] Due to the adoption of the above technical solution, the present invention has the following beneficial effects.
[0017] (1) The present invention constructs a coordinate system and arranges a sensor array to comprehensively cover different directions, ensure the comprehensiveness of signal acquisition, and provide a basis for subsequent data analysis, so that the location of the pipeline can be determined more accurately. By applying a vibration signal with gradually increasing amplitude and specific frequency, and determining the technical means of specific amplitude and specific frequency, the problem of signal attenuation and interference under different geological conditions is solved, so that the system can find the most suitable vibration parameters for propagation in different medium environments, thereby improving the effectiveness and stability of the signal and further improving the detection accuracy.
[0018] (2) The present invention collects the vibration signal synchronously S r ( t ) is converted into frequency domain signal by fast Fourier transform (FFT) X r ( w ), and calculate the energy of each sensor E r, combined with the sensor positions with the highest and second highest energy, accurately determine and indicate the direction of the pipeline; by connecting the sensor positions with the highest and second highest energy to the vibration source to determine the direction of the pipeline, the problem that traditional methods are difficult to directly give the pipeline path is solved. This underground pipeline search method can intuitively and accurately point out the actual direction of the pipeline, greatly simplifying the interpretation process of the final result.
[0019] (3) The present invention solves the problems of uneven signal acquisition quality under different ground materials, different pipe materials, different pipe diameters, whether the pipe is empty and whether the pipe is blocked, by rationally arranging the position and distance of the sensor array and combining the confirmation method of specific amplitude and specific frequency for different media (such as soil, rock, cement floor, etc.). Regardless of soil or non-soil surface, pipe material, pipe diameter and whether the pipe is blocked or empty, effective signal acquisition can be guaranteed, thereby improving the scope of application and reliability of the system.
[0020] (4) By adopting a special device including a signal generator, a multi-element variable frequency vibration source, a sensor and a data processing module, the problem of inconvenient manual operation and high technical threshold is solved. The device realizes an automated and intelligent pipeline detection process, which not only improves work efficiency but also reduces the difficulty of operation, making it possible for non-professionals to use it. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The following is a detailed discussion of the making and application of the preferred embodiments of the present invention. However, it should be understood that the present invention provides many applicable inventive concepts that can be embodied in various specific environments. The specific embodiments discussed are only for the purpose of illustrating the specific ways of making and using the present invention, and do not limit the scope of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative work.
[0022] Figure 1 It is a schematic diagram of the linear underground pipeline search of the present invention.
[0023] Figure 2 It is a schematic diagram of the turning type underground pipeline tracing of the present invention. DETAILED DESCRIPTION
[0024] The following is a detailed discussion of the making and application of the preferred embodiments of the present invention. However, it should be understood that the present invention provides many applicable inventive concepts that can be embodied in various specific environments. The specific embodiments discussed are only intended to illustrate specific ways to make and use the present invention and do not limit the scope of the present invention.
[0025] The present invention constructs a coordinate system and arranges sensor arrays to comprehensively cover different directions, ensure the comprehensiveness of signal acquisition, and provide a basis for subsequent data analysis, so that the position of the pipeline can be determined more accurately; by applying vibration signals with gradually increasing amplitude and frequency and determining the technical means of specific amplitude and frequency, the problems of signal attenuation and interference under different geological conditions are solved, so that the system can find the most suitable vibration parameters for propagation in different medium environments, thereby improving the effectiveness and stability of the signal and further improving the detection accuracy. Example 1
[0026] like Figure 1 The linear schematic diagram of underground pipeline tracing based on a multi-element variable frequency vibration source shown in FIG. 1 includes the following steps: Step 1: Taking the multi-element variable frequency vibration source as the origin and taking the east direction as the x Axis, due north is y Axis Construction xoy Coordinate system; then with the multi-element variable frequency vibration source as the origin, 8 sensors for collecting vibration source signals are evenly and symmetrically arranged with a radius of 1m to form a sensor array, which are arranged in 8 directions of due east, due south, due west, due north, southeast, southwest, northwest and northeast. The amplitude of the vibration source signal is 1-10mm, and the frequency is 1Hz-1000Hz.
[0027] Among them, the multi-element variable frequency vibration source adopts a multi-element variable frequency vibration source coupling type with a magnetic base to be magnetically attracted to the bottom of the fire hydrant, pipeline valve or the surface of the metal pipe, and according to the material, pipe type and pipe diameter of different pipes, select the corresponding length of detachable soft magnetic strips to wrap the magnetic base of the multi-element variable frequency vibration source and the metal pipe, non-metallic pipe, fire hydrant, and pipeline valve bottom in a circular or cross-winding manner to perform secondary reinforcement to complete the installation of the multi-element variable frequency vibration source. The detachable soft magnetic strip of the corresponding length has a magnetic strength of 200 millitesla, a width of 15mm, and a thickness of 10mm, and the length is selected according to the size of the pipe diameter. The length of the soft magnetic strip is selected in the range of 300mm-1000mm.
[0028] When the non-metallic pipe is reinforced for the second time, the soft magnetic strip is used to reinforce the fire hydrant, the bottom of the pipe valve or the surface of the metal pipe by passing the soft magnetic strip of the corresponding length through the port of the magnetic base and wrapping around the circular metal pipe of the fire hydrant, the bottom of the pipe valve or the surface of the metal pipe for 3-5 circles. When the non-metallic pipe is reinforced for the second time, the soft magnetic strip is reinforced by wrapping around and winding.
[0029] When reinforcing the non-metallic pipe for the second time, first pass the soft magnetic strip of corresponding length through the port of the magnetic base, and use the circular winding method of winding around the circular diameter of the non-metallic pipe for 3-5 circles for preliminary reinforcement; on the outside of the circular winding soft magnetic strip, use an even number of soft magnetic strips of corresponding length to perform three-time cross-winding reinforcement on the magnetic base and the non-metallic pipe.
[0030] Step 2: Start the multi-element variable frequency vibration source, and apply vibration signals with amplitudes and frequencies from small to large to the multi-element variable frequency vibration source through a signal generator to drive the multi-element variable frequency vibration source to generate vibrations. When the sensor stably collects the multi-element variable frequency vibration signal, determine the specific amplitude and specific frequency of the vibration source signal corresponding to the multi-element variable frequency vibration source in a specific medium. The vibration source signal propagates along both sides of the wall of the pipeline to be measured or both sides of the fluid in the pipeline, and at the same time radiates in an attenuated manner to all orientation sensors in the specific medium. The specific medium includes soil, rock, mud soil, cement floor, brick and stone, and asphalt pavement.
[0031] When the specific medium is soil, the leakage detection rod is inserted into the ground 15 cm, and the sensor is set at the top of the leakage detection rod to collect the vibration source signal. When the specific medium is non-soil, the sensor is directly set at the corresponding position of the surface to collect the vibration source signal.
[0032] Step 3: The sensor array is used to synchronously collect vibration signals at 8 different locations 1m away from the multi-element variable frequency vibration source. S r ( t ): S r ( t )= Asin (2 πf * t )= Asin ( w * t ) in, r is the distance between the sensor and the multivariate frequency-converting vibration source; A It is the amplitude of the adjustable vibration source signal under a specific ground medium; f It is the frequency of the adjustable vibration source signal in a specific ground medium; w It is the angular frequency of the adjustable vibration source signal in a specific ground medium.
[0033] Step 4: For the vibration source signal in step 3 S r ( t ) to perform fast Fourier transform to obtain the corresponding signal frequency domain X r ( w ): in, t Indicates time; w is the angular frequency of the source signal; i Is an imaginary unit.
[0034] Step 5: Based on the signal frequency domain in step 4 X r ( w ) respectively calculate the energy of the eight sensors in different orientations in the sensor array E r : .
[0035] Step 6: Connect the sensors with the highest energy and the second highest energy in the sensor array to the multi-element variable frequency vibration source respectively, so as to accurately obtain the actual underground direction of the pipeline to be tested.
[0036] from Figure 1 It can be seen that among the eight directions of the sensor array at a distance of 1m from the multi-element variable frequency vibration source, the highest energy and the second highest energy are located in the northeast and southwest directions respectively. At the same time, the sensors located in the northeast and southwest directions are connected to the multi-element variable frequency vibration source respectively. It can be concluded that in this embodiment, the underground pipeline is a straight line passing through the multi-element variable frequency vibration source, i.e. the far point, and the direction is northeast.
[0037] The present invention collects the vibration signal synchronously S r ( t ) is converted into frequency domain signal by fast Fourier transform (FFT) X r ( w ), and calculate the energy of each sensor E r , combined with the sensor positions with the highest and second highest energy, accurately determine and indicate the direction of the pipeline; by connecting the sensor positions with the highest and second highest energy to the vibration source to determine the direction of the pipeline, the problem that traditional methods are difficult to directly give the pipeline path is solved. This underground pipeline search method can intuitively and accurately point out the actual direction of the pipeline, greatly simplifying the interpretation process of the final result. Example 2
[0038] like Figure 2 The linear schematic diagram of underground pipeline tracing based on multi-element variable frequency vibration source is shown. The following steps are included: Step 1: Take the multi-element variable frequency vibration source as the origin and the due east direction as the x Axis, due north is y Axis Construction xoyCoordinate system; then with the multi-element variable frequency vibration source as the origin, 8 sensors for collecting vibration source signals are evenly and symmetrically arranged with a radius of 0.3m to form a sensor array, which are arranged in 8 directions of due east, due south, due west, due north, southeast, southwest, northwest and northeast. The amplitude of the vibration source signal is 1-10mm, and the frequency is 1Hz-1000Hz.
[0039] Among them, the multi-element variable frequency vibration source adopts a multi-element variable frequency vibration source coupling type with a magnetic base to be magnetically attracted to the bottom of the fire hydrant, pipeline valve or the surface of the metal pipe, and according to the material, pipe type and pipe diameter of different pipes, select the corresponding length of detachable soft magnetic strips to wrap the magnetic base of the multi-element variable frequency vibration source and the metal pipe, non-metallic pipe, fire hydrant, and pipeline valve bottom in a circular or cross-winding manner to perform secondary reinforcement to complete the installation of the multi-element variable frequency vibration source. The detachable soft magnetic strip of the corresponding length has a magnetic strength of 200 millitesla, a width of 15mm, and a thickness of 10mm, and the length is selected according to the size of the pipe diameter. The length of the soft magnetic strip is selected in the range of 300mm-1000mm.
[0040] When the non-metallic pipe is reinforced for the second time, the soft magnetic strip is used to reinforce the fire hydrant, the bottom of the pipe valve or the surface of the metal pipe by passing the soft magnetic strip of the corresponding length through the port of the magnetic base and wrapping around the circular metal pipe of the fire hydrant, the bottom of the pipe valve or the surface of the metal pipe for 3-5 circles. When the non-metallic pipe is reinforced for the second time, the soft magnetic strip is reinforced by wrapping around and winding.
[0041] When reinforcing the non-metallic pipe for the second time, first pass the soft magnetic strip of corresponding length through the port of the magnetic base, and use the circular winding method of winding around the circular diameter of the non-metallic pipe for 3-5 circles for preliminary reinforcement; on the outside of the circular winding soft magnetic strip, use an even number of soft magnetic strips of corresponding length to perform three-time cross-winding reinforcement on the magnetic base and the non-metallic pipe.
[0042] Step 2: Start the multi-element variable frequency vibration source, and apply vibration signals with amplitudes and frequencies from small to large to the multi-element variable frequency vibration source through a signal generator to drive the multi-element variable frequency vibration source to generate vibrations. When the sensor stably collects the multi-element variable frequency vibration signal, determine the specific amplitude and specific frequency of the vibration source signal corresponding to the multi-element variable frequency vibration source in a specific medium. The vibration source signal propagates along both sides of the wall of the pipeline to be measured or both sides of the fluid in the pipeline, and at the same time radiates in an attenuated manner to all orientation sensors in the specific medium. The specific medium includes soil, rock, mud soil, cement floor, brick and stone, and asphalt pavement.
[0043] When the specific medium is soil, the leakage detection rod is inserted into the ground 15 cm, and the sensor is set at the top of the leakage detection rod to collect the vibration source signal. When the specific medium is non-soil, the sensor is directly set at the corresponding position of the surface to collect the vibration source signal.
[0044] Step 3: The sensor array synchronously collects vibration signals at 8 different directions at a distance of 0.3m from the multi-element variable frequency vibration source. S r ( t ): S r ( t )= Asin (2 πf * t )= Asin ( w * t ) in, r is the distance between the sensor and the multivariate frequency-converting vibration source; A It is the amplitude of the adjustable vibration source signal under a specific ground medium; f It is the frequency of the adjustable vibration source signal in a specific ground medium; w It is the angular frequency of the adjustable vibration source signal in a specific ground medium.
[0045] Step 4: For the vibration source signal in step 3 S r ( t ) to perform fast Fourier transform to obtain the corresponding signal frequency domain X r ( w ): in, t Indicates time; w is the angular frequency of the source signal; i Is an imaginary unit.
[0046] Step 5: Based on the signal frequency domain in step 4 X r ( w ) respectively calculate the 4 n +4 different azimuth sensor energy E r : .
[0047] Step 6: Connect the sensors with the highest energy and the second highest energy in the sensor array to the multi-element variable frequency vibration source respectively, so as to accurately obtain the actual underground direction of the pipeline to be tested.
[0048] from Figure 2 It can be seen that among the eight directions of the sensor array at a distance of 0.3m from the multi-element variable frequency vibration source, the highest energy and the second highest energy are located in the northeast and south directions respectively. At the same time, the sensors located in the northeast and south directions are connected to the multi-element variable frequency vibration source respectively. It can be concluded that in this embodiment, the underground pipeline is a turning type beyond the multi-element variable frequency vibration source, i.e., the far point, with part of the direction being northeast and the other part being south, and the two are divided by the multi-element variable frequency vibration source.
[0049] The present invention aims at different media (such as soil, rock, cement floor, etc.), through the reasonable layout of the position and distance of the sensor array, combined with the confirmation method of specific amplitude and specific frequency, to solve the problems of uneven signal acquisition quality under different ground materials, different pipe materials, different pipe diameters, whether the pipe is empty and whether the pipe is blocked. Regardless of whether it is soil or non-soil surface, the pipe material, pipe diameter and whether it is blocked or empty, it can ensure effective signal acquisition, thereby improving the scope of application and reliability of the system. Example 3
[0050] An underground pipeline search device based on a multi-element variable frequency vibration source comprises a signal generator, a multi-element variable frequency vibration source, a sensor for collecting a vibration source signal emitted by the multi-element variable frequency vibration source, and a data processing module for data processing; the signal generator generates a driving signal to drive the multi-element variable frequency vibration source to generate a vibration signal with amplitude and frequency ranging from small to large, and when the sensors uniformly and symmetrically arranged with the multi-element variable frequency vibration source as the center can stably collect the multi-element variable frequency vibration signal, the specific amplitude and specific frequency of the vibration source signal corresponding to the multi-element variable frequency vibration source under a specific medium are determined; the vibration source signal propagates along both sides of the wall of the pipeline to be measured or both sides of the fluid in the pipeline, and at the same time radiates to each sensor under the specific medium in an attenuated manner, the vibration source signal is synchronously collected by the sensor, and the collected vibration source signal is output to the data processing module.
[0051] The specific medium includes soil, rock, muddy soil, cement floor, masonry and asphalt pavement. When the specific medium is soil, the leakage detection rod is inserted into the ground by 15 cm, and the sensor is set at the top of the leakage detection rod to collect the vibration source signal. When the specific medium is non-soil, the sensor is directly set at the corresponding position of the surface to collect the vibration source signal.
[0052] The data processing module processes the vibration source signal synchronously collected by the sensor S r ( t ): S r ( t )= Asin (2 πf * t )= Asin ( w * t ) in, r is the distance between the sensor and the multivariate frequency-converting vibration source; A It is the amplitude of the adjustable vibration source signal under a specific ground medium; f It is the frequency of the adjustable vibration source signal in a specific ground medium; w It is the angular frequency of the adjustable vibration source signal in a specific ground medium.
[0053] The vibration source signal S r ( t ) to perform fast Fourier transform to obtain the corresponding signal frequency domain X r ( w ): in, t Indicates time; w is the angular frequency of the source signal; i Is an imaginary unit.
[0054] The signal is transformed into frequency domain X r ( w ) respectively calculate the energy of sensors at different positions in the sensor array E r : .
[0055] By connecting the sensors with the highest energy and the second highest energy in the sensor array to the multi-element variable frequency vibration source respectively, the actual underground direction of the pipeline to be tested can be accurately indicated.
[0056] The present invention solves the problems of inconvenient manual operation and high technical threshold by adopting a special device including a signal generator, a multi-element variable frequency vibration source, a sensor and a data processing module. The device realizes an automated and intelligent pipeline detection process, which not only improves work efficiency but also reduces the difficulty of operation, so that non-professionals can also use it.
[0057] Although the specification has been described in detail, it should be understood that various changes, substitutions and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. In addition, the specific embodiments described are not intended to limit the scope of the invention, and those of ordinary skill in the art can easily understand based on the present invention that currently existing or later to be developed processes, machines, manufactures, material compositions, means, methods, or steps can perform substantially the same functions as the embodiments of the present invention or obtain substantially the same results. Therefore, the appended claims are intended to include such processes, machines, manufactures, material compositions, means, methods or steps within their scope.
Claims
1. A method for finding underground pipelines based on a multi-element variable frequency vibration source, characterized in that: The following steps are involved: Step 1: Take the multi-element variable frequency vibration source as the origin and the east direction as the x Axis, due north is y Axis Construction xoy Coordinate system; then take the multivariate variable frequency vibration source as the origin and the radius as r Even and symmetrical layout4 n +4 sensors for collecting vibration source signals form a sensor array; Step 2: Start the multi-element variable frequency vibration source, apply vibration signals with amplitudes and frequencies from small to large to the multi-element variable frequency vibration source through a signal generator to drive the multi-element variable frequency vibration source to generate vibrations, and when the sensor stably collects the multi-element variable frequency vibration signal, determine the specific amplitude and specific frequency of the vibration source signal corresponding to the multi-element variable frequency vibration source in a specific medium; Step 3: The sensor array synchronously collects the multivariate variable frequency vibration source from the distance r of 4 n +4 vibration signals in different directions S r ( t ): S r ( t )= Asin (2 πf * t )= Asin ( w * t ) in, r is the distance between the sensor and the multivariate variable frequency vibration source; A It is the amplitude of the adjustable vibration source signal under a specific ground medium; f It is the frequency of the adjustable vibration source signal in a specific ground medium; w is the angular frequency of the adjustable vibration source signal in a specific ground medium; Step 4: For the vibration source signal in step 3 S r ( t ) to perform fast Fourier transform to obtain the corresponding signal frequency domain X r ( w ): in, t Indicates time; w is the angular frequency of the source signal; i is an imaginary unit; Step 5: Based on the signal frequency domain in step 4 X r ( w ) respectively calculate the 4 n +4 different orientation sensors' energy E r : Step 6: Connect the sensors with the highest energy and the second highest energy in the sensor array to the multi-element variable frequency vibration source respectively, so as to accurately obtain the actual underground direction of the pipeline to be tested.
2. The underground pipeline locating method based on multi-element variable frequency vibration source as claimed in claim 1, characterized in that: In step 2, the vibration source signal of the specific amplitude and specific frequency propagates along both sides of the wall of the pipeline to be measured or both sides of the fluid in the pipeline, and at the same time radiates in an attenuated manner to all orientation sensors under the specific medium.
3. The underground pipeline locating method based on multi-element variable frequency vibration source as claimed in claim 2, characterized in that: The specific media include soil, rock, muddy soil, cement ground, brick and stone and asphalt road surface.
4. The underground pipeline locating method based on a multi-element variable frequency vibration source as claimed in claim 1, characterized in that: The multi-element variable frequency vibration source is installed at the bottom of a fire hydrant, a pipeline valve or the surface of a metal pipeline.
5. The underground pipeline locating method based on multi-element variable frequency vibration source as claimed in claim 3, characterized in that: When the specific medium is soil, the vibration source signal is collected by inserting the leak detection rod into the ground by 15 cm and setting the sensor at the top of the leak detection rod.
6. The underground pipeline locating method based on multi-element variable frequency vibration source as claimed in claim 5, characterized in that: When the specific medium is not soil, the sensor is directly set at the corresponding position on the surface to collect the vibration source signal.
7. The underground pipeline locating method based on multi-element variable frequency vibration source as claimed in claim 6, characterized in that: The distance between the sensor and the multivariate frequency conversion vibration source r ≥0.3m.
8. The underground pipeline locating method based on multi-element variable frequency vibration source as claimed in claim 7, characterized in that: The distance between the sensor and the multivariate frequency conversion vibration source r is 1m.
9. The underground pipeline locating method based on multi-element variable frequency vibration source as claimed in claim 1, characterized in that: There are 8 sensors in the sensor array, which are respectively arranged in 8 directions: due east, due south, due west, due north, southeast, southwest, northwest, and northeast.
10. An underground pipeline locating device based on a multi-element variable frequency vibration source, characterized in that: The invention comprises a signal generator, a multi-element variable frequency vibration source, a sensor for collecting the vibration source signal emitted by the multi-element variable frequency vibration source, and a data processing module for data processing; the signal generator generates a driving signal to drive the multi-element variable frequency vibration source to generate a vibration signal with amplitude and frequency from small to large, and when the sensors evenly and symmetrically arranged with the multi-element variable frequency vibration source as the center can stably collect the multi-element variable frequency vibration signal, the specific amplitude and specific frequency of the vibration source signal corresponding to the multi-element variable frequency vibration source under a specific medium are determined; the vibration source signal propagates along both sides of the wall of the pipeline to be measured or both sides of the fluid in the pipeline, and at the same time radiates to each sensor under the specific medium in an attenuated manner, the vibration source signal is synchronously collected by the sensor, and the collected vibration source signal is output to the data processing module, and the data processing module adopts the underground pipeline search method as described in any one of claims 1-9 to accurately output the actual underground direction of the pipeline to be measured.