CN113720500B - Stress monitoring sensor and method for steel structure - Google Patents
Stress monitoring sensor and method for steel structure Download PDFInfo
- Publication number
- CN113720500B CN113720500B CN202111014809.6A CN202111014809A CN113720500B CN 113720500 B CN113720500 B CN 113720500B CN 202111014809 A CN202111014809 A CN 202111014809A CN 113720500 B CN113720500 B CN 113720500B
- Authority
- CN
- China
- Prior art keywords
- stress
- sensor
- magnetic
- steel structure
- monitoring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 81
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 47
- 239000010959 steel Substances 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000008859 change Effects 0.000 claims description 12
- 230000005389 magnetism Effects 0.000 claims description 10
- 239000000725 suspension Substances 0.000 claims description 9
- 230000005358 geomagnetic field Effects 0.000 claims description 8
- 230000007704 transition Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000011900 installation process Methods 0.000 claims description 2
- 238000004458 analytical method Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000009659 non-destructive testing Methods 0.000 abstract description 2
- 206010016256 fatigue Diseases 0.000 description 13
- 238000001514 detection method Methods 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 9
- 239000000835 fiber Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 230000006698 induction Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 206010017472 Fumbling Diseases 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/12—Measuring force or stress, in general by measuring variations in the magnetic properties of materials resulting from the application of stress
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
Landscapes
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The invention is applicable to the technical field of nondestructive testing, and provides a stress monitoring sensor and a method for a steel structure. The invention obtains the stress parallel direction magnetic signal and the vertical direction magnetic signal through the stress monitoring sensor, defines a new characteristic quantity gamma for monitoring, provides a key parameter for the analysis of the stress magnetic signal, can acquire and analyze various signals, can better distinguish noise and obtain better signal-to-noise ratio, and provides a new scheme for monitoring the stress and fatigue damage of the steel structure in the whole, thereby improving the production and life safety.
Description
Technical Field
The invention belongs to the technical field of nondestructive testing, and particularly relates to a stress monitoring sensor and a method for a steel structure.
Background
Steel structures such as steel bridges, cranes, large engineering and production equipment, high-speed rail stations and the like are important infrastructures of national economy, and the safety of the steel structures is of great importance. However, these steel structures inevitably suffer from fatigue damage, the only difference being the extent of the damage. In the case where the fatigue damage is not found, if the fatigue damage is left to develop, a serious safety accident may be finally generated. Therefore, it is necessary to detect and monitor the stress and fatigue damage of the steel structure, providing basic data for further maintenance.
At present, the fatigue damage of the steel structure is based on deformation. That is, on the basis of deformation, the stress is calculated by theory, and then the fatigue damage is calculated by load spectrum and the like. Specifically, there are two methods, namely, a fiber grating method and a strain gauge method. The fiber grating method adopts FBG grating, which is tightly attached to the surface of the monitored object to be used as a sensor for monitoring. And calculating the local deformation of the monitored object by the characteristic quantity change of the laser in the fiber grating. The strain gauge method adopts an electric patch which is tightly attached to the surface of a monitored object. When the monitoring object transmits local strain, the resistance (conductance) of the strain gauge changes accordingly. By monitoring this change in resistance or conductance, the surface deformation can be known in turn. The local stress can be obtained by calculation after knowing the deformation, as in the fiber grating method.
The fiber grating method and the strain gage method are used for obtaining the internal stress by monitoring the local deformation of the steel structure and then carrying out theoretical calculation. This approach has certain limitations in principle: firstly, not all stresses correspond to deformations, in some cases the steel structure may not appear deformed, but its stresses have accumulated to a very great extent, so that sudden failure of the steel structure occurs, in which case the fiber grating method and the strain gauge method do not monitor its stresses well; secondly, there is also a correspondence between local deformation and stress. Local deformations, in particular local, surface deformations, do not represent local stresses inside the monitored object; again, both methods are based on the amount of change in deformation, and their stress cannot be obtained until no new change occurs, in other words they do not have the capability of stress tracing; finally, the data obtained by the two methods are related to field operation, and under the condition that different testers adopt different processes, very different data can be obtained, particularly when surface fixing is carried out, the obtained data has relatively large variability due to the influence of environmental factors such as materials, air temperature and the like.
Disclosure of Invention
In view of the foregoing, an object of the present invention is to provide a stress monitoring sensor and a method for a steel structure, which aim to solve the foregoing technical problems.
The invention adopts the following technical scheme:
The stress monitoring sensor for the steel structure comprises a base, wherein a magnetic sensor is arranged at the central position in the base, a pair of or two pairs of sensor arms are symmetrically arranged on the base by taking the magnetic sensor as a center, each sensor arm comprises a horizontal magnetism gathering part, a suspension connecting part and a transition part positioned between the two parts, the position of the horizontal magnetism gathering part is lower than that of the suspension connecting part, and the suspension connecting part is inserted into the base.
Further, the horizontal magnetism gathering part is of a plane fan-shaped structure, and the transition part is of an arc-shaped structure as a whole.
Further, the base is internally provided with a horizontal hollow channel penetrating through the base aiming at the position of each pair of sensor arms, the magnetic sensor is positioned at the middle position of the horizontal hollow channel, and the suspended connecting part of each sensor arm is inserted into the corresponding horizontal hollow channel.
Further, the stress monitoring sensor is a single-axis sensor, the sensor arms are provided with a pair, and the magnetic sensor is a one-dimensional magnetic sensor.
Further, the stress monitoring sensor is a double-shaft sensor, two pairs of sensor arms are arranged vertically, and the magnetic sensor is a two-dimensional magnetic sensor.
In another aspect, the method for stress monitoring of a steel structure comprises the steps of:
installing a stress monitoring sensor on the surface of the steel structure to be monitored, so that a pair of sensor arms of the stress monitoring sensor are positioned on two sides of a stress concentration line of the steel structure to be monitored;
The stress monitoring sensor acquires the magnetic field intensity parallel to the stress direction and perpendicular to the stress direction;
the change in the characteristic quantity gamma value, which is the ratio of the magnetic field intensity parallel to the stress direction to the magnetic field intensity perpendicular to the stress direction, is monitored.
Further, the specific installation process of the stress monitoring sensor is as follows:
Temporarily shielding the geomagnetic field;
Moving the stress monitoring sensor within the shielded range such that the absolute value of the reading in one direction is the largest and the absolute value of the reading in the other direction is the smallest among the magnetic field strengths parallel to the stress direction and perpendicular to the stress direction;
Fixing a stress magnetic sensor on the surface of the monitored steel structure, and connecting peripheral auxiliary devices;
And removing the geomagnetic field shield.
Further, the process of shielding the geomagnetic field is as follows: a monitoring area is defined on the surface of the monitored steel structure, and a shielding range is defined on the surface of the monitored steel structure by using a shielding magnetic fence.
Furthermore, the shielding magnetic fence is in a truncated cone shape with an opening at the upper part and a large opening at the lower part.
The beneficial effects of the invention are as follows: the invention expands the stress magnetic signal of the surface area of the monitored steel structure from the original monitoring point to the monitoring surface, thereby being more accurate than the traditional stress monitoring sensor; meanwhile, in the design of the sensor arm, the stress magnetic signal amplitude is increased by adopting the magnetism gathering principle, so that the stress monitoring sensor has higher sensitivity; meanwhile, two single-axis or double-axis stress monitoring sensors are used for obtaining stress parallel-direction magnetic signals and perpendicular-direction magnetic signals, a new characteristic quantity gamma is defined for monitoring, a key parameter is provided for analysis of the stress magnetic signals, multiple signal acquisition and analysis modes can be performed, noise can be resolved, and a better signal-to-noise ratio is obtained; in the whole, the invention provides a new scheme for monitoring the stress and fatigue damage of the steel structure, and can improve the production and life safety.
Drawings
FIG. 1 is a block diagram of a stress monitoring sensor provided by an embodiment of the present invention;
FIG. 2 is a block diagram of another stress monitoring sensor provided in an embodiment of the present invention;
FIG. 3 is a schematic diagram of H/, H' ";
fig. 4 is a block diagram of a shielded magnetic fence.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In order to illustrate the technical scheme of the invention, the following description is made by specific examples.
Magnetic memory detection technology has long been in progress, as early as the end of the last century, russian scientist Du Bofu taught that when a power plant was overhauled, a pressure-bearing pipeline was found to produce a magnetic signal after a period of operation. Through long-term fumbling, they relate such magnetic signals to stresses and have formed a technique for detecting device stresses and fatigue damage, known as magnetic memory detection. There are several theoretical explanations later, including force-magnetic interactions, stress energy and magnetic energy conversion, etc. However, the magnetic memory technology is generally used as a detection technology, namely, a detection field, and is manually operated periodically or in one time. Typically a probe is manually operated to perform a one-or two-dimensional scan over the surface of the device. This is currently a magnetic memory detection technique that cannot be used for monitoring stress and fatigue damage at a fixed location.
Therefore, based on the actual needs, the magnetic memory detection technology is developed into a monitoring technology, and the sensor needs to be redesigned and a new physical quantity is proposed. The stress monitoring sensor provided by the embodiment can realize stress monitoring.
As shown in fig. 1 and 2, the stress monitoring sensor for a steel structure provided in this embodiment includes a base 1, a magnetic sensor 2 is installed at a central position in the base 1, a pair of or two pairs of sensor arms 3 are symmetrically installed on the base 1 with the magnetic sensor 2 as a center, the sensor arms 3 include a horizontal magnetism collecting portion 31, a suspension connecting portion 32, and a transition portion 33 located therebetween, the position of the horizontal magnetism collecting portion 31 is lower than the suspension connecting portion 32, and the suspension connecting portion 32 is inserted into the base 1.
FIG. 1 shows a single axis stress monitoring sensor with a pair of sensor arms and a one-dimensional magnetic sensor. FIG. 2 shows a dual axis stress monitoring sensor with two pairs of sensor arms arranged vertically, the magnetic sensor being a two-dimensional magnetic sensor. The invention relates to a stress and fatigue damage monitoring scheme of a magnetic induction technology, which can monitor fatigue damage of a steel structure through two vertically arranged single-axis stress monitoring sensors or one double-axis stress monitoring sensor.
As shown in fig. 1 and 2, a sensor arm of the stress monitoring sensor is made of a soft magnetic material with high magnetic conductivity, the specific shape of the sensor arm is composed of three parts, the first part is a horizontal magnetism collecting part, the first part is used for being attached to the surface of a monitored steel structure, and the shape of the sensor arm is a plane sector; the second part is a suspended connecting part, is generally rectangular and is inserted into the base, the vertical section is rectangular, and the general width and thickness dimension can be designed to be 6mm or 2mm; the third part is a transition part between the two parts, and the whole part is of an arc-shaped structure.
In the illustration, the positions of the two sensor arms of each pair are provided with horizontal hollow channels penetrating through the base 1, the magnetic sensor 2 is positioned in the middle of the horizontal hollow channels, and the suspended connecting part 32 of each sensor arm 3 is inserted into the corresponding horizontal hollow channel. The base is made of plastic, the sensor arms are symmetrically inserted into the hollow pipeline, and a gap of about 10mm is reserved at the middle position of the hollow pipeline, namely the distance between the pair of sensor arms, and the sensor arms are used for installing the magnetic sensor so as to read information such as the size of the stress magnetic signal under the change of time, load and the like. For a single-axis stress monitoring sensor, a one-dimensional magnetic sensor is arranged in the middle, and a sensitive axis of the sensor is parallel to a sensor arm of the single-axis stress monitoring sensor; for a biaxial stress monitoring sensor, a two-dimensional magnetic sensor is arranged in the middle, and two sensitive axes of the two-dimensional magnetic sensor are parallel to two pairs of sensor arms of the biaxial stress monitoring sensor. For the fixation of the system itself, a base with a hollow channel is used for fixing the sensor arm, after which the sensitive axis of the magnetic sensor is aligned and finally encapsulated, the base is not shown encapsulated, but can be encapsulated by a cover plate.
The stress monitoring sensor designed by the embodiment can acquire the stress magnetic signal, and after the stress magnetic signal is acquired, the stress magnetic signal needs to be analyzed. At present, the characteristic quantity of the stress magnetic signal is developed for detection, and the stress magnetic signal related to stress detection mainly has four physical quantities: peak-to-valley of stress magnetic signal, background signal intensity, gradient, zero crossing. All four signals are variations of distance. That is, these four physical quantities are quantities that are acquired by the stress magnetic sensor during detection and that vary with the surface distance at the surface of the object to be detected. If the stress magnetic sensor itself does not move but is fixed at one point, the four physical quantities described above cannot be obtained. Therefore, for stress monitoring of fixed locations of steel structures, new physical quantities need to be studied and proposed to characterize the stress magnetic signals of the fixed points.
For a uniaxial stress magnetic sensor, a magnetic sensor mounted in the central gap will read the magnetic field flux through both sensor arms. Of course, because the vertical cross-sectional area of the sensor arm is constant, this measure is the stress magnetic signal at the gap, which can be measured in terms of the magnetic field strength H (t). The magnetic field strength is similar to the background signal in the traditional magnetic memory detection, and is also a magnetic field signal, and is closely related to the internal stress and fatigue damage. However, unlike the magnetic memory technology, the magnetic field intensity H (t) signal is collected by the horizontal magnetic concentration part having the magnetic concentration function to collect the S-pole and N-pole signals on the left and right sides of the stress concentration line. Meanwhile, because of the communication function of the sensor arms, a magnetic circuit in the air is formed at two sides of the stress concentration line of the monitored object, so that the concentration, amplification, collection and measurement of stress magnetic signals are convenient.
In the case of using a dual-axis sensor, two stress magnetic signals H ∥ (t) and H ⊥ (t) can be directly obtained, and the distribution indicates the magnetic field strength signal that varies with time in the parallel direction and the perpendicular direction of the stress. From practical experience, it is known that the direction of the internal principal stresses is generally perpendicular to the stress concentrating line. So, as shown in fig. 3, the two sensor arms across the stress riser are typically measured as H ∥ (t), while along the two sensor arms along the stress riser are typically measured as H ⊥ (t). Based on the stress magnetic sensor described above. The embodiment of the invention provides a new characteristic quantity gamma value which is defined as the ratio of the magnetic field intensity parallel to the stress direction to the magnetic field intensity perpendicular to the stress direction. For example, γ (t) =h ∥/H⊥, which may be defined as H ⊥/H∥.
Gamma (t) is a time-varying quantity and is not a physical quantity based on scanning over the surface of the object to be monitored. Where H ∥ represents the magnetic field strength parallel to the stress direction, and H ⊥ represents the magnetic field strength perpendicular to the stress direction. Meanwhile, gamma is a dimensionless physical quantity at a fixed position, and compared with H ∥ or H ⊥ alone, the ratio can better represent the change of the detected object, in particular the change of long-term stability.
The embodiment of the invention provides a specific stress monitoring method, which comprises the following steps:
S1, installing a stress monitoring sensor on the surface of a steel structure to be monitored, so that a pair of sensor arms of the stress monitoring sensor are positioned on two sides of a stress concentration line of the steel structure to be monitored.
The method comprises the steps of firstly finding a stress concentration line of a steel structure to be monitored.
In order to temporarily shield the geomagnetic field, a specific shielding process needs to determine a monitoring area on the surface of the monitored steel structure, and the area is more representative and the data is more stable as the area is much larger than the monitoring range of the strain gauge and the fiber bragg grating. The shielding magnetic fence shown in fig. 4 is used for enclosing a shielding range on the surface of the monitored steel structure, for example, a small circular area is enclosed, and the diameter of the area is required to be about 200 mm. The shielding magnetic fence is in a truncated cone shape with upper and lower openings and small upper and large lower, and is convenient for operating the stress monitoring sensor in the shielding magnetic fence.
Then moving the stress monitoring sensor within the shielding range so that the absolute value of the reading in one direction is the largest and the absolute value of the reading in the other direction is the smallest in the magnetic field intensity parallel to the stress direction and perpendicular to the stress direction; because of the directionality of the magnetic signal, the absolute value is used here to calculate, irrespective of the sign of the signal reading. For using two uniaxial stress monitoring sensors, it is necessary to ensure perpendicularity of the two uniaxial stress monitoring sensors during movement. This problem can be avoided for a dual axis stress monitoring sensor where both detection directions are already perpendicular. It is therefore preferred to employ a biaxial stress monitoring sensor.
The stress magnetic sensor is then fixed to the surface of the monitored steel structure, and peripheral auxiliary devices such as a power supply, an AD conversion acquisition unit, a data storage and transmission unit and the like are connected. Because the stress magnetic sensor reads magnetic signals, is not local deformation of the monitored object, and does not need polishing, surface treatment and pasting, various fixing modes such as binding and adsorption can be adopted, and the stress magnetic sensor can be pasted, but does not need polishing paint.
And finally, removing the geomagnetic field shielding, and beginning to record data, wherein the step of tracing and analyzing the existing stress magnetic signals.
S2, the stress monitoring sensor acquires the magnetic field intensity parallel to the stress direction and perpendicular to the stress direction.
And S3, monitoring the change of a characteristic quantity gamma value, wherein the characteristic quantity gamma value is the ratio of the magnetic field intensity parallel to the stress direction to the magnetic field intensity perpendicular to the stress direction, and the ratio can be H ∥/H⊥ or H ⊥/H∥ as described above. And the subsequent early warning or judgment is carried out by monitoring the change trend of the gamma value of the characteristic quantity, for example, the change trend exceeds the expected value, or the gamma value exceeds the threshold range, and the like, and a specific monitoring scheme can be formulated according to the actual.
In summary, the invention provides a stress and fatigue damage monitoring scheme based on the magnetic induction technology for steel structures by adopting the advanced magnetic induction technology. The invention expands the monitoring range through the design of the magnetic circuit, and simultaneously increases the signal intensity to obtain more stable stress magnetic signals. The invention also provides a method for determining the stress magnetic signal direction on site, which is used for obtaining the magnetic signal in the parallel stress parallel direction and the magnetic signal in the perpendicular stress parallel direction, namely the magnetic field intensity in the two directions, obtaining a new characteristic quantity gamma and providing a key parameter for the analysis of the stress magnetic signal. In general, the technical scheme of the invention can be used as the supplement of the existing fiber bragg grating sensor and the strain gauge sensor.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (7)
1. The stress monitoring sensor for the steel structure is characterized by comprising a base, wherein a magnetic sensor is arranged in the center of the base, one or two pairs of sensor arms are symmetrically arranged on the base by taking the magnetic sensor as a center, each sensor arm comprises a horizontal magnetism gathering part, a suspension connecting part and a transition part positioned between the two parts, the position of the horizontal magnetism gathering part is lower than that of the suspension connecting part, and the suspension connecting part is inserted into the base; the horizontal magnetism gathering part is of a plane fan-shaped structure, and the whole transition part is of an arc-shaped structure; the base is internally provided with a horizontal hollow channel penetrating through the base aiming at the position of each pair of sensor arms, the magnetic sensor is positioned at the middle position of the horizontal hollow channel, and the suspended connecting part of each sensor arm is inserted into the corresponding horizontal hollow channel.
2. The stress monitoring sensor for steel structures of claim 1 wherein the stress monitoring sensor is a single axis sensor, the sensor arms have a pair, and the magnetic sensor is a one-dimensional magnetic sensor.
3. The stress monitoring sensor for steel structures of claim 1, wherein the stress monitoring sensor is a dual-axis sensor, the sensor arms are arranged in two pairs and vertically, and the magnetic sensor is a two-dimensional magnetic sensor.
4. A stress monitoring method for a steel structure, characterized in that the method employs a stress monitoring sensor according to any of claims 1-3, the method comprising the steps of:
installing a stress monitoring sensor on the surface of the steel structure to be monitored, so that a pair of sensor arms of the stress monitoring sensor are positioned on two sides of a stress concentration line of the steel structure to be monitored;
The stress monitoring sensor acquires the magnetic field intensity parallel to the stress direction and perpendicular to the stress direction;
the change in the characteristic quantity gamma value, which is the ratio of the magnetic field intensity parallel to the stress direction to the magnetic field intensity perpendicular to the stress direction, is monitored.
5. The method for monitoring the stress of a steel structure according to claim 4, wherein the specific installation process of the stress monitoring sensor is as follows:
Temporarily shielding the geomagnetic field;
Moving the stress monitoring sensor within the shielded range such that the absolute value of the reading in one direction is the largest and the absolute value of the reading in the other direction is the smallest among the magnetic field strengths parallel to the stress direction and perpendicular to the stress direction;
Fixing a stress magnetic sensor on the surface of the monitored steel structure, and connecting peripheral auxiliary devices;
And removing the geomagnetic field shield.
6. The method for monitoring stress of steel structure according to claim 5, wherein the process of shielding geomagnetic field is as follows: a monitoring area is defined on the surface of the monitored steel structure, and a shielding range is defined on the surface of the monitored steel structure by using a shielding magnetic fence.
7. The method for monitoring the stress of a steel structure according to claim 6, wherein the shielding magnetic fence is in a shape of a truncated cone with a top opening and a bottom opening being smaller and larger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111014809.6A CN113720500B (en) | 2021-08-31 | 2021-08-31 | Stress monitoring sensor and method for steel structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111014809.6A CN113720500B (en) | 2021-08-31 | 2021-08-31 | Stress monitoring sensor and method for steel structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113720500A CN113720500A (en) | 2021-11-30 |
| CN113720500B true CN113720500B (en) | 2024-07-05 |
Family
ID=78679978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111014809.6A Active CN113720500B (en) | 2021-08-31 | 2021-08-31 | Stress monitoring sensor and method for steel structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113720500B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106979835A (en) * | 2016-01-18 | 2017-07-25 | 西红柿科技（武汉）有限公司 | A kind of magnetic memory signal collection device and stress real-time monitoring system |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9310803D0 (en) * | 1993-05-21 | 1993-07-14 | Atomic Energy Authority Uk | Stress measurement |
| US6441530B1 (en) * | 2000-12-01 | 2002-08-27 | Petersen Technology Corporation | D.C. PM motor with a stator core assembly formed of pressure shaped processed ferromagnetic particles |
| ITTO20030774A1 (en) * | 2003-10-03 | 2005-04-04 | Fiat Ricerche | PRESSURE SENSOR DEVICE, ITS PROCEDURE |
| CN100570355C (en) * | 2007-06-08 | 2009-12-16 | 北京工业大学 | Method and device for determining stress based on magnetic flux leakage measurement |
| JP2009294062A (en) * | 2008-06-05 | 2009-12-17 | Hitachi Ltd | Magnetic signal measuring method and magnetic signal measuring instrument |
| WO2011085400A1 (en) * | 2010-01-11 | 2011-07-14 | Magcanica, Inc. | Magnetoelastic force sensors, transducers, methods, and systems for assessing bending stress |
| EP2602595B1 (en) * | 2011-12-08 | 2016-03-02 | PolyResearch AG | Active mechanical force sensor |
| CN204065016U (en) * | 2014-08-26 | 2014-12-31 | 湘潭宏远电子科技有限公司 | A kind of ferromagnetic tubes inner wall corrosion the cannot-harm-detection device |
| RU2585796C1 (en) * | 2014-12-12 | 2016-06-10 | Общество с ограниченной ответственностью "Энергодиагностика" (ООО "Энергодиагностика") | Method for quality control of articles |
| CN104697677B (en) * | 2015-03-09 | 2017-10-03 | 中国科学院宁波材料技术与工程研究所 | A kind of piezomagnetic strain gauge |
| CN106996955B (en) * | 2016-01-26 | 2019-10-08 | 西红柿科技（武汉）有限公司 | A kind of magnetic memory detection device for curved surface |
| CN106768507B (en) * | 2017-03-21 | 2019-12-06 | 武汉工程大学 | Magnetic memory clamping device, leakage detection device and method using same |
| CN108555910B (en) * | 2018-04-19 | 2021-08-03 | 湖北工业大学 | Rotational force control system and control method of magnetic robot for HVDC transmission line |
| US11287340B2 (en) * | 2018-07-02 | 2022-03-29 | Flexiv Ltd. | Multi-axis force and torque sensor and robot having the same |
| CN109540351A (en) * | 2018-12-03 | 2019-03-29 | 沈阳工业大学 | A kind of Magnetic Memory experimental provision for creating dynamic magnetic field environment |
| CN111289606B (en) * | 2020-03-31 | 2023-06-02 | 西安工程大学 | A magnetic effect stress detection system and method based on the existing magnetism of structural steel |
| CN113049672B (en) * | 2021-01-22 | 2023-07-14 | 马勇男 | Self-adaptive curved surface magnetic memory detection method |
-
2021
- 2021-08-31 CN CN202111014809.6A patent/CN113720500B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106979835A (en) * | 2016-01-18 | 2017-07-25 | 西红柿科技（武汉）有限公司 | A kind of magnetic memory signal collection device and stress real-time monitoring system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113720500A (en) | 2021-11-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103048102B (en) | A kind of state evaluating method of beam bridge | |
| CA2548938C (en) | Apparatus and method for detection of defects using flux leakage techniques | |
| CN203785700U (en) | Oversized concrete floor construction period temperature and contraction monitoring device | |
| JP3416875B2 (en) | Civil engineering / construction structure condition inspection system and sensor-integrated device used therefor | |
| CN111457889B (en) | Method for monitoring subway tunnel settlement through optical fiber static level | |
| CN109556774A (en) | The non-destructive monitoring system and monitoring method of residual stress in ferromagnetic steel | |
| CN103046524A (en) | Piezocone penetration test probe for probing underground magnetic field intensity | |
| CN204302226U (en) | A kind of magnet sensor arrangement detected for magnetic memory two-dimensional | |
| CN205861459U (en) | A kind of rock sample transverse strain Multi point measuring apparatus | |
| CN209459692U (en) | A kind of temperature stress monitoring device of road surface structare layer | |
| CN109341508B (en) | In-service steel rail web thickness non-contact detection device and method | |
| CN109813800A (en) | It is sensed based on optical fiber magnetic and combines collection magnetic surface scanning cannula defect inspection method and device | |
| CN212747877U (en) | Digital bridge detection system | |
| CN113720500B (en) | Stress monitoring sensor and method for steel structure | |
| CN203249889U (en) | Metal pipeline corrosion detection device | |
| CN112432694B (en) | Industrial plant power monitoring method based on distributed optical fiber sensor | |
| CN109459163A (en) | A kind of temperature stress monitoring device of road surface structare layer | |
| CN103954296B (en) | A kind of FWD laser calibrating equipment | |
| CN109323684A (en) | A kind of inclination measurement system and its tilt measurement | |
| CN210346585U (en) | Detection apparatus suitable for goat shows pole | |
| CN113176337A (en) | Pile soil rigidity in-situ monitoring method, test system and test equipment | |
| CN209605762U (en) | Plate thickness on-line measuring device | |
| KR100609259B1 (en) | Fuel rod testing device | |
| CN102831665B (en) | Power transmission tower intensity and vibration off-line intelligent routing inspection system and early warning method thereof | |
| CN115096486B (en) | Force measurement and displacement type friction pendulum support and sensor replacement method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |