CN117740204A - Multidirectional stress detection sensor and detection method - Google Patents
Multidirectional stress detection sensor and detection method Download PDFInfo
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Abstract
The application relates to the technical field of stress measurement, in particular to a multidirectional stress detection sensor and a detection method, wherein the stress detection sensor comprises: a magnetic yoke set, an exciting coil set and a magnetic sensor set; the first magnetic yoke and the second magnetic yoke of the magnetic yoke group are crossed, and two ends of the magnetic sensor group, the first magnetic yoke and the second magnetic yoke are positioned on the surface to be tested of the pipeline test piece; the first coil, the second coil, the third coil and the fourth coil of the excitation coil group are connected to two ends of the first magnetic yoke and the second magnetic yoke; the first magnetic sensor, the second magnetic sensor, the third magnetic sensor and the fourth magnetic sensor of the magnetic sensor group are respectively arranged at the midpoints of adjacent leg connecting lines of the first magnetic yoke and the second magnetic yoke; the fifth magnetosensitive sensor is arranged at the midpoint of the diagonal leg connecting line of the first magnetic yoke and the second magnetic yoke. The mode of current flowing into the coil is changed, and the magnetic field change is collected through the magnetic sensor group, so that the problem that the accurate measurement of multi-directional stress cannot be realized is solved.
Description
Technical Field
The application relates to the technical field of stress measurement, in particular to a multidirectional stress detection sensor and a detection method.
Background
The oil pipeline is one kind of pipeline system for conveying oil and natural gas and consists of mainly oil pipeline, oil conveying station and other auxiliary equipment. Compared with railway and highway oil transportation, the oil transportation pipeline has the characteristics of large transportation capacity, good tightness, low cost, high safety coefficient and the like. The petroleum and natural gas pipeline is made of metal, and is extremely easy to generate stress concentration under the conditions of self weight, internal and external load, material aging, external environment, pipeline structural displacement and other internal and external factors, so that the pipeline is broken, leaked and burst and other important safety accidents are caused. The oil pipeline inevitably generates stress in the preparation and use processes, and the working performance of the pipeline is changed in a stress highly concentrated area, so that brittle fracture is very easy to occur. Therefore, the stress concentration state of the pipeline can be timely, effectively and quickly identified, and corresponding solving measures can be adopted, so that safety accidents can be effectively prevented.
In the related art, the stress evaluation of the pipeline test piece is in a single axis or orthogonal direction, and when the stress direction is inconsistent with the orthogonal direction of the two axes, the stress evaluation value is inaccurate, so that the problem of stress distribution in the test piece is erroneously evaluated.
Disclosure of Invention
The application provides a multidirectional stress detection sensor and a detection method, which are used for solving the problem that accurate measurement of multidirectional stress cannot be realized.
A first aspect of the present application provides a multidirectional stress detection sensor, comprising: a magnetic yoke set, an excitation coil set and a magnetic sensor set;
the magnetic yoke group comprises a first magnetic yoke and a second magnetic yoke, the first magnetic yoke and the second magnetic yoke are mutually intersected, and the bottom of the magnetic sensor group and the two ends of the first magnetic yoke and the second magnetic yoke are positioned on the surface to be tested of the pipeline test piece; the excitation coil group comprises a first coil, a second coil, a third coil and a fourth coil; the first coil, the second coil, the third coil and the fourth coil are respectively connected to two ends of the first magnetic yoke and the second magnetic yoke; the magnetic sensor group comprises a first magnetic sensor, a second magnetic sensor, a third magnetic sensor, a fourth magnetic sensor and a fifth magnetic sensor; the first magnetic sensor, the second magnetic sensor, the third magnetic sensor and the fourth magnetic sensor are respectively arranged on the midpoints of adjacent leg connecting lines of the first magnetic yoke and the second magnetic yoke; the fifth magnetosensitive sensor is arranged at the midpoint of a diagonal leg connecting line of the first magnetic yoke and the second magnetic yoke.
The multidirectional stress detection sensor is characterized in that a plurality of directional magnetic fields are excited in a pipeline test piece by changing the mode of leading in current to the coils on the magnetic yoke group, and the magnetic field change is collected through the magnetic sensor groups arranged around the magnetic yoke group, so that the nondestructive detection of multidirectional stress is realized, and the problem that the accurate measurement of multidirectional stress cannot be realized is solved.
Optionally, the first magnetic yoke and the second magnetic yoke are both U-shaped magnetic yokes.
Optionally, the first yoke includes a first yoke leg, a first yoke connecting portion, and a second yoke leg, and two ends of the first yoke connecting portion are respectively connected to the first yoke leg and the second yoke leg; the second magnetic yoke comprises a third magnetic yoke leg, a second magnetic yoke connecting part and a fourth magnetic yoke leg, and two ends of the second magnetic yoke connecting part are respectively connected with the third magnetic yoke leg and the fourth magnetic yoke leg; the first yoke connecting portion and the second yoke connecting portion are intersected with each other.
The first yoke connection portion and the first yoke connection portion are intersected with each other so that the magnetic fields are not affected, and a multi-directional stress value is conveniently calculated.
Optionally, the first coil, the second coil, the third coil and the fourth coil are all connected with an ac power source, and are respectively sleeved with the first yoke leg, the second yoke leg, the third yoke leg and the fourth yoke leg in sequence.
The first coil, the second coil, the third coil and the fourth coil can generate an alternating magnetic field in the magnetic yoke set after being electrified with alternating current and form a magnetic loop with a pipeline test piece, so that the magnetic loop is convenient to detect rapidly and accurately.
Optionally, the first yoke leg with the interval of third yoke leg, the third yoke leg with the interval of second yoke leg, the second yoke leg with the interval of fourth yoke leg, the fourth yoke leg with the interval of first yoke leg is equal, is convenient for calculate the stress value more.
Optionally, the first magnetic yoke is not connected with the second magnetic yoke, and a gap is provided between the bottom surface of the first magnetic yoke connecting portion and the top surface of the second magnetic yoke connecting portion.
The gap may reduce the occurrence of coupling of the magnetic field between the first and second yokes.
A second aspect of the present application provides a multi-directional stress detection method applied to the multi-directional stress detection sensor of the first aspect, the method comprising:
exciting a third coil and a fourth coil, and reversing the third coil and the fourth coil excitation directions;
acquiring a first excitation voltage and a first excitation frequency;
collecting a first magnetic field signal and a second magnetic field signal through a fifth magneto-dependent sensor;
and calculating a first direction stress value according to the first excitation voltage, the first excitation frequency, the first magnetic field signal and the second magnetic field signal.
By the method, the multi-directional stress detection sensor can detect the first-direction stress value on the pipeline test piece, so that the pipeline test piece is not only faster and more accurate, but also is not damaged.
Optionally, the method further comprises:
exciting a first coil and a second coil, and enabling excitation directions of the first coil and the second coil to be opposite;
acquiring a second excitation voltage and a second excitation frequency;
collecting a first magnetic field signal and a second magnetic field signal through the fifth magneto-dependent sensor;
and calculating a second direction stress value according to the second excitation voltage, the second excitation frequency, the first magnetic field signal and the second magnetic field signal.
By the method, the multi-directional stress detection sensor can detect the stress value in the second direction on the pipeline test piece, so that the pipeline test piece is not only faster and more accurate, but also is not damaged.
Optionally, the method further comprises:
exciting the first coil, the second coil, the third coil and the fourth coil, and reversing the excitation directions of the first coil and the fourth coil with respect to the second coil and the third coil;
acquiring a third excitation voltage and a third excitation frequency;
collecting a third magnetic field signal and a fourth magnetic field signal through a first magnetic sensor and a second magnetic sensor;
and calculating a third directional stress value according to the third excitation voltage, the third excitation frequency, the third magnetic field signal and the fourth magnetic field signal.
By the method, the multi-directional stress detection sensor can detect the third-directional stress value on the pipeline test piece, so that the pipeline test piece is not only faster and more accurate, but also is not damaged.
Optionally, the method further comprises:
exciting the first coil, the second coil, the third coil and the fourth coil, and causing the second coil and the fourth coil to be excited in opposite directions to the first coil and the third coil;
acquiring a fourth excitation voltage and a fourth excitation frequency;
acquiring a fifth magnetic field signal and a sixth magnetic field signal through a third magnetic sensor and a fourth magnetic sensor;
and calculating a fourth direction stress value according to the fourth excitation voltage, the fourth excitation frequency, the fifth magnetic field signal and the sixth magnetic field signal.
By the method, the multidirectional stress detection sensor can detect the stress value in the fourth direction on the pipeline test piece, so that the pipeline test piece is not only faster and more accurate, but also is not damaged.
According to the technical scheme, the application provides a multidirectional stress detection sensor and a detection method, wherein the multidirectional stress detection sensor comprises: a magnetic yoke set, an excitation coil set and a magnetic sensor set; the magnetic yoke group comprises a first magnetic yoke and a second magnetic yoke, the first magnetic yoke and the second magnetic yoke are mutually intersected, and the bottom of the magnetic sensor group and the two ends of the first magnetic yoke and the second magnetic yoke are positioned on the surface to be tested of the pipeline test piece; the excitation coil group comprises a first coil, a second coil, a third coil and a fourth coil; the first coil, the second coil, the third coil and the fourth coil are respectively connected to two ends of the first magnetic yoke and the second magnetic yoke; the magnetic sensor group comprises a first magnetic sensor, a second magnetic sensor, a third magnetic sensor, a fourth magnetic sensor and a fifth magnetic sensor; the first magnetic sensor, the second magnetic sensor, the third magnetic sensor and the fourth magnetic sensor are respectively arranged on the midpoints of adjacent leg connecting lines of the first magnetic yoke and the second magnetic yoke; the fifth magnetosensitive sensor is arranged at the midpoint of a diagonal leg connecting line of the first magnetic yoke and the second magnetic yoke. The magnetic field is excited in the pipeline test piece by changing the mode of the current flowing into the coil, and the magnetic field change is acquired by the magnetic sensor group, so that the problem that the accurate measurement of multi-directional stress cannot be realized is solved.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic perspective view of a multi-directional stress detection sensor according to an embodiment of the present application;
FIG. 2 is a schematic perspective view of a magnetic yoke assembly of a multidirectional stress detection sensor according to an embodiment of the present application;
FIG. 3 is a schematic diagram illustrating a first direction stress magnetic field trend in the multi-direction stress detection method according to the embodiment of the present application;
FIG. 4 is a diagram illustrating a second direction stress magnetic field trend in the multi-directional stress detection method according to the embodiment of the present application;
FIG. 5 is a diagram illustrating the third direction stress magnetic field trend in the multi-direction stress detection method according to the embodiment of the present application;
fig. 6 is a schematic diagram illustrating a fourth direction stress magnetic field trend in the multi-direction stress detection method according to the embodiment of the present application.
Illustration of:
wherein 11-the first yoke; 111-first yoke legs; 112-a first yoke connection; 113-a second yoke leg; 12-a second yoke; 121-a third yoke leg; 122-a second yoke connection; 123-fourth yoke leg; 21-a first coil; 22-a second coil; 23-a third coil; 24-fourth coil; 31-a first magneto-dependent sensor; 32-a second magneto-dependent sensor; 33-a third magneto-dependent sensor; 34-a fourth magneto-dependent sensor; 35-fifth magneto-dependent sensor.
Detailed Description
Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the examples below do not represent all embodiments consistent with the present application. Merely as examples of systems and methods consistent with some aspects of the present application as detailed in the claims.
The oil pipeline is one kind of pipeline system for conveying oil and natural gas and consists of mainly oil pipeline, oil conveying station and other auxiliary equipment. Compared with railway and highway oil transportation, the oil transportation pipeline has the characteristics of large transportation capacity, good tightness, low cost, high safety coefficient and the like. The petroleum and natural gas pipeline is made of metal, and is extremely easy to generate stress concentration under the conditions of self weight, internal and external load, material aging, external environment, pipeline structural displacement and other internal and external factors, so that the pipeline is broken, leaked and burst and other important safety accidents are caused. The oil pipeline inevitably generates stress in the preparation and use processes, and the working performance of the pipeline is changed in a stress highly concentrated area, so that brittle fracture is very easy to occur. Therefore, the stress concentration state of the pipeline can be timely, effectively and quickly identified, and corresponding solving measures can be adopted, so that safety accidents can be effectively prevented.
In the related embodiment, the stress evaluation of the pipeline test piece is in a single axis or orthogonal direction, and when the stress direction is inconsistent with the orthogonal direction of the two axes, the stress evaluation value is inaccurate, so that the problem of stress distribution in the test piece is erroneously evaluated.
In order to solve the problem that accurate measurement of multi-directional stress cannot be achieved, referring to fig. 1, fig. 1 is a schematic diagram of a three-dimensional structure of a multi-directional stress detection sensor. Some embodiments of the present application provide a multidirectional stress detection sensor, comprising: a magnetic yoke set, an excitation coil set and a magnetic sensor set;
the magnetic yoke group comprises a first magnetic yoke 11 and a second magnetic yoke 12, the first magnetic yoke 11 and the second magnetic yoke 12 are intersected with each other, and the bottom of the magnetic sensor group and two ends of the first magnetic yoke 11 and the second magnetic yoke 12 are positioned on the surface to be tested of the pipeline test piece; the excitation coil group includes a first coil 21, a second coil 22, a third coil 23, and a fourth coil 24; the first coil 21, the second coil 22, the third coil 23 and the fourth coil 24 are connected to both ends of the first yoke 11 and the second yoke 12, respectively; the magnetic sensor group includes a first magnetic sensor 31, a second magnetic sensor 32, a third magnetic sensor 33, a fourth magnetic sensor 34, and a fifth magnetic sensor 35; the first magneto-dependent sensor 31, the second magneto-dependent sensor 32, the third magneto-dependent sensor 33 and the fourth magneto-dependent sensor 34 are respectively arranged at the midpoints of the adjacent leg wires of the first yoke 11 and the second yoke 12; the fifth magnetosensitive sensor 35 is disposed at the midpoint of the diagonal leg line of the first yoke 11 and the second yoke 12.
It should be understood that the multidirectional stress detection sensor is based on an electromagnetic principle, when alternating current is supplied to coils in a magnetic yoke group, each magnetic yoke in the magnetic yoke group and a pipeline test piece form a closed magnetic circuit, when stress exists in the pipeline test piece, the magnetic characteristics of the pipeline test piece change, and a magnetic sensor group arranged around the magnetic yoke can recognize the change of a space magnetic field so as to detect the stress in the pipeline test piece. The magnetic sensor in the magnetic sensor group is a triaxial magnetic sensor, and can measure magnetic fields in three orthogonal directions.
The multidirectional stress detection sensor is characterized in that a mode that a coil on a magnetic yoke group is connected with current is changed, a plurality of directional magnetic fields are excited in a pipeline test piece, and magnetic field changes are collected through a magnetic sensor group arranged around the magnetic yoke group, so that multidirectional stress detection is realized, and the problem that accurate measurement of multidirectional stress cannot be realized is solved.
In some embodiments, the first yoke 11 and the second yoke 12 can be arbitrarily adjusted in the crossing angle, so as to realize stress measurement in more directions.
In some embodiments, the first yoke 11 and the second yoke 12 are both U-shaped magnetic yokes.
It will be appreciated that the dimensions of the first yoke 11 and the second yoke 12 are different, and that the U-shaped magnetic yoke is more convenient for exciting a plurality of magnetic fields. In other embodiments, the first yoke 11 and the second yoke 12 may be gate-type magnetic yokes or arc-type magnetic yokes.
In some embodiments, referring to fig. 2, fig. 2 is a schematic perspective view of a yoke assembly of a multi-directional stress detection sensor. The first yoke 11 includes a first yoke leg 111, a first yoke connecting portion 112, and a second yoke leg 113, both ends of the first yoke connecting portion 112 being connected to the first yoke leg 111 and the second yoke leg 113, respectively; the second yoke 12 includes a third yoke leg 121, a second yoke connecting portion 122, and a fourth yoke leg 123, both ends of the second yoke connecting portion 122 being connected to the third yoke leg 121 and the fourth yoke leg 123, respectively; the first yoke connecting portion 112 and the second yoke connecting portion 122 cross each other.
The first yoke connection part 112 and the first yoke connection part 112 cross each other so as not to be affected between magnetic fields, and facilitate calculation of stress values in a plurality of directions.
In some embodiments, the first coil 21, the second coil 22, the third coil 23, and the fourth coil 24 are all connected to an ac power source and are sleeved with the first yoke leg 111, the second yoke leg 113, the third yoke leg 121, and the fourth yoke leg 123, respectively, in sequence.
The first coil 21, the second coil 22, the third coil 23 and the fourth coil 24 can generate an alternating magnetic field in the magnetic yoke set after alternating current is supplied, and form a magnetic loop with a pipeline test piece, so that rapid and accurate detection is facilitated.
In some embodiments, the spacing between the first yoke leg 111 and the third yoke leg 121, the spacing between the third yoke leg 121 and the second yoke leg 113, the spacing between the second yoke leg 113 and the fourth yoke leg 123, and the spacing between the fourth yoke leg 123 and the first yoke leg 111 are all equal, which is more convenient for calculating the stress value.
In some embodiments, the first yoke 11 and the second yoke 12 are not connected, and a gap is provided between the bottom surface of the first yoke connection portion 112 and the top surface of the second yoke connection portion 122.
The gap may reduce the occurrence of coupling of the magnetic field between the first and second yokes.
Some embodiments of the present application further provide a multi-directional stress detection method, which is applied to the multi-directional stress detection sensor, and the method includes:
exciting the third coil 23 and the fourth coil 24, and reversing the excitation directions of the third coil 23 and the fourth coil 24;
acquiring a first excitation voltage and a first excitation frequency;
collecting a first magnetic field signal and a second magnetic field signal by a fifth magneto-dependent sensor 35;
a first directional stress value is calculated based on the first excitation voltage, the first excitation frequency, the first magnetic field signal, and the second magnetic field signal.
It should be appreciated that the acquisition of the excitation voltage and the excitation frequency is related to the current excited by the ac power source, and that the stresses in the multiple directions are measured with the same excitation voltage and excitation frequency. When the stress in the X direction needs to be measured, excitation is applied to the third coil 23 and the fourth coil 24 By the ac power supply, and the excitation directions of the third coil 23 and the fourth coil 24 are opposite, so as to obtain the first excitation voltage V and the first excitation frequency f, and collect the first magnetic field signal Bx and the second magnetic field signal By of the fifth magnetosensitive sensor 35, and the magnetic field trend is shown in fig. 3, and fig. 3 is a schematic diagram of the first direction stress magnetic field trend in the multidirectional stress detection method.
By the method, the multi-directional stress detection sensor can detect the first-direction stress value on the pipeline test piece, so that the pipeline test piece is not only faster and more accurate, but also can not be damaged.
In some embodiments, the method further comprises:
exciting the first coil 21 and the second coil 22, and reversing the excitation directions of the first coil 21 and the second coil 22;
acquiring a second excitation voltage and a second excitation frequency;
collecting a first magnetic field signal and a second magnetic field signal by a fifth magneto-dependent sensor 35;
and calculating a second direction stress value according to the second excitation voltage, the second excitation frequency, the first magnetic field signal and the second magnetic field signal.
It should be understood that the second direction may be the Y direction, when the Y-direction stress needs to be measured, excitation is applied to the first coil 21 and the second coil 22 By the ac power source, and the excitation directions of the first coil 21 and the second coil 22 are opposite, so as to obtain the second excitation voltage V and the second excitation frequency f, and collect the first magnetic field signal Bx and the second magnetic field signal By of the fifth magneto-sensor 35, where the magnetic field trend is shown in fig. 4, and fig. 4 is a schematic diagram of the second direction stress magnetic field trend in a multi-direction stress detection method.
By the method, the multi-directional stress detection sensor can detect the stress value in the second direction on the pipeline test piece, so that the pipeline test piece is not only faster and more accurate, but also can not be damaged.
In some embodiments, the method further comprises:
exciting the first coil 21, the second coil 22, the third coil 23 and the fourth coil 24, and causing the first coil 21 and the fourth coil 24 to be excited in opposite directions to the second coil 22 and the third coil 23;
acquiring a third excitation voltage and a third excitation frequency;
collecting a third magnetic field signal and a fourth magnetic field signal by the first magnetic sensor 31 and the second magnetic sensor 32;
and calculating a third directional stress value according to the third excitation voltage, the third excitation frequency, the third magnetic field signal and the fourth magnetic field signal.
It should be appreciated that the third direction may be the X1 direction and that X1 may be 45 from the X axis.
When the stress in the X1 direction needs to be measured, excitation is applied to the first coil 21, the second coil 22, the third coil 23 and the fourth coil 24 By the ac power supply, and the excitation directions of the first coil 21 and the fourth coil 24 are opposite to those of the second coil 22 and the third coil 23, so as to obtain a third excitation voltage V and a third excitation frequency f, and collect third magnetic field signals Bx1 and fourth magnetic field signals By1 of the first magneto-sensor 31 and the second magneto-sensor 32, and the magnetic field trend is shown in fig. 5, and fig. 5 is a schematic diagram of the third direction stress magnetic field trend in the multi-directional stress detection method.
By the method, the multi-directional stress detection sensor can detect the third-directional stress value on the pipeline test piece, so that the pipeline test piece is not only faster and more accurate, but also can not be damaged.
In some embodiments, the method further comprises:
exciting the first coil 21, the second coil 22, the third coil 23 and the fourth coil 24, and making the second coil 22 and the fourth coil 24 excite in opposite directions to the first coil 21 and the third coil 23;
acquiring a fourth excitation voltage and a fourth excitation frequency;
acquiring a fifth magnetic field signal and a sixth magnetic field signal by the third magneto-dependent sensor 33 and the fourth magneto-dependent sensor 34;
and calculating a fourth direction stress value according to the fourth excitation voltage, the fourth excitation frequency, the fifth magnetic field signal and the sixth magnetic field signal.
It should be appreciated that the fourth direction may be the Y1 direction and Y1 may be 135 ° from the X axis.
When the Y1 direction stress needs to be measured, excitation is applied to the first coil 21, the second coil 22, the third coil 23 and the fourth coil 24 By the ac power supply, and the excitation directions of the second coil 22 and the fourth coil 24 are opposite to the excitation directions of the first coil 21 and the third coil 23, so as to obtain a fourth excitation voltage V and a fourth excitation frequency f, and collect fifth magnetic field signals Bx2 and sixth magnetic field signals By2 of the third magneto-dependent sensor 33 and the fourth magneto-dependent sensor 34, the magnetic field trend is shown in fig. 6, and fig. 6 is a schematic diagram of the fourth direction stress magnetic field trend in the multi-directional stress detection method.
By the method, the multidirectional stress detection sensor can detect the stress value in the fourth direction on the pipeline test piece, so that the pipeline test piece is not only faster and more accurate, but also is not damaged.
According to the technical scheme, the embodiment of the application provides a multidirectional stress detection sensor and a detection method, wherein the multidirectional stress detection sensor comprises: a magnetic yoke set, an excitation coil set and a magnetic sensor set; the magnetic yoke group comprises a first magnetic yoke 11 and a second magnetic yoke 12, the first magnetic yoke 11 and the second magnetic yoke 12 are intersected with each other, and the bottom of the magnetic sensor group and two ends of the first magnetic yoke 11 and the second magnetic yoke 12 are positioned on the surface to be tested of the pipeline test piece; the excitation coil group includes a first coil 21, a second coil 22, a third coil 23, and a fourth coil 24; the first coil 21, the second coil 22, the third coil 23 and the fourth coil 24 are connected to both ends of the first yoke 11 and the second yoke 12, respectively; the magnetic sensor group includes a first magnetic sensor 31, a second magnetic sensor 32, a third magnetic sensor 33, a fourth magnetic sensor 34, and a fifth magnetic sensor 35; the first magneto-dependent sensor 31, the second magneto-dependent sensor 32, the third magneto-dependent sensor 33 and the fourth magneto-dependent sensor 34 are respectively arranged at the midpoints of the adjacent leg wires of the first yoke 11 and the second yoke 12; the fifth magnetosensitive sensor 35 is disposed at the midpoint of the diagonal leg line of the first yoke 11 and the second yoke 12. The magnetic field is excited in the pipeline test piece by changing the mode of the current flowing into the coil, and the magnetic field change is collected by the magnetic sensor group, so that the problem that the accurate measurement of multi-directional stress cannot be realized is solved.
The foregoing detailed description of the embodiments is merely illustrative of the general principles of the present application and should not be taken in any way as limiting the scope of the invention. Any other embodiments developed in accordance with the present application without inventive effort are within the scope of the present application for those skilled in the art.
Claims (10)
1. A multidirectional stress detection sensor, comprising: a magnetic yoke set, an excitation coil set and a magnetic sensor set;
the magnetic yoke group comprises a first magnetic yoke (11) and a second magnetic yoke (12), the first magnetic yoke (11) and the second magnetic yoke (12) are mutually intersected, and the bottom of the magnetic sensor group, the two ends of the first magnetic yoke (11) and the two ends of the second magnetic yoke (12) are positioned on the surface to be tested of the pipeline test piece;
the excitation coil group comprises a first coil (21), a second coil (22), a third coil (23) and a fourth coil (24); the first coil (21), the second coil (22), the third coil (23) and the fourth coil (24) are respectively connected to two ends of the first magnetic yoke (11) and the second magnetic yoke (12);
the magnetic sensor group comprises a first magnetic sensor (31), a second magnetic sensor (32), a third magnetic sensor (33), a fourth magnetic sensor (34) and a fifth magnetic sensor (35); the first magnetic sensor (31), the second magnetic sensor (32), the third magnetic sensor (33) and the fourth magnetic sensor (34) are respectively arranged at the midpoints of adjacent leg connecting lines of the first magnetic yoke (11) and the second magnetic yoke (12); the fifth magneto-dependent sensor (35) is arranged at the midpoint of the diagonal leg line of the first yoke (11) and the second yoke (12).
2. The multidirectional stress detecting sensor according to claim 1, wherein the first yoke (11) and the second yoke (12) are both U-shaped magnetic yokes.
3. The multidirectional stress detection sensor according to claim 2, wherein the first yoke (11) includes a first yoke leg (111), a first yoke connecting portion (112), and a second yoke leg (113), both ends of the first yoke connecting portion (112) being connected to the first yoke leg (111) and the second yoke leg (113), respectively; the second magnetic yoke (12) comprises a third magnetic yoke leg (121), a second magnetic yoke connecting part (122) and a fourth magnetic yoke leg (123), and two ends of the second magnetic yoke connecting part (122) are respectively connected with the third magnetic yoke leg (121) and the fourth magnetic yoke leg (123); the first yoke connecting portion (112) and the second yoke connecting portion (122) intersect each other.
4. A multidirectional stress detecting sensor according to claim 3, wherein the first coil (21), the second coil (22), the third coil (23) and the fourth coil (24) are all connected to an ac power source and are sleeved with the first yoke leg (111), the second yoke leg (113), the third yoke leg (121) and the fourth yoke leg (123), respectively, in sequence.
5. A multidirectional stress-detecting sensor according to claim 3, wherein the spacing of the first yoke leg (111) from the third yoke leg (121), the spacing of the third yoke leg (121) from the second yoke leg (113), the spacing of the second yoke leg (113) from the fourth yoke leg (123), the spacing of the fourth yoke leg (123) from the first yoke leg (111) are all equal.
6. A multidirectional stress detecting sensor according to claim 3, wherein the first yoke (11) and the second yoke (12) are not connected, and a gap is provided between the bottom surface of the first yoke connecting portion (112) and the top surface of the second yoke connecting portion (122).
7. A multi-directional stress detection method applied to the multi-directional stress detection sensor of any of claims 1-6, the method comprising:
exciting a third coil (23) and a fourth coil (24), and reversing the excitation direction of the third coil (23) and the fourth coil (24);
acquiring a first excitation voltage and a first excitation frequency;
collecting a first magnetic field signal and a second magnetic field signal by a fifth magneto-dependent sensor (35);
and calculating a first direction stress value according to the first excitation voltage, the first excitation frequency, the first magnetic field signal and the second magnetic field signal.
8. The multi-directional stress detection method of claim 7, further comprising:
exciting a first coil (21) and a second coil (22), and reversing the excitation directions of the first coil (21) and the second coil (22);
acquiring a second excitation voltage and a second excitation frequency;
collecting a first magnetic field signal and a second magnetic field signal by the fifth magneto-dependent sensor (35);
and calculating a second direction stress value according to the second excitation voltage, the second excitation frequency, the first magnetic field signal and the second magnetic field signal.
9. The multi-directional stress detection method of claim 8, further comprising:
exciting the first coil (21), the second coil (22), the third coil (23) and the fourth coil (24), and causing the first coil (21) and the fourth coil (24) to be excited in opposite directions to the second coil (22) and the third coil (23);
acquiring a third excitation voltage and a third excitation frequency;
collecting a third magnetic field signal and a fourth magnetic field signal through a first magnetic sensor (31) and a second magnetic sensor (32);
and calculating a third directional stress value according to the third excitation voltage, the third excitation frequency, the third magnetic field signal and the fourth magnetic field signal.
10. The multi-directional stress detection method of claim 8, further comprising:
exciting the first coil (21), the second coil (22), the third coil (23) and the fourth coil (24), and causing the second coil (22) and the fourth coil (24) to be excited in opposite directions to the first coil (21) and the third coil (23);
acquiring a fourth excitation voltage and a fourth excitation frequency;
acquiring a fifth magnetic field signal and a sixth magnetic field signal by a third magnetic sensor (33) and a fourth magnetic sensor (34);
and calculating a fourth direction stress value according to the fourth excitation voltage, the fourth excitation frequency, the fifth magnetic field signal and the sixth magnetic field signal.
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