CN116519183A - System and method for measuring stress of large-sized magnet coil supporting mechanism - Google Patents
System and method for measuring stress of large-sized magnet coil supporting mechanism Download PDFInfo
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- CN116519183A CN116519183A CN202310306984.5A CN202310306984A CN116519183A CN 116519183 A CN116519183 A CN 116519183A CN 202310306984 A CN202310306984 A CN 202310306984A CN 116519183 A CN116519183 A CN 116519183A
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- 230000007246 mechanism Effects 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000001133 acceleration Effects 0.000 claims abstract description 47
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 238000011156 evaluation Methods 0.000 claims abstract description 5
- 230000003139 buffering effect Effects 0.000 claims description 17
- 238000007599 discharging Methods 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000013016 damping Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 238000013213 extrapolation Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 238000011160 research Methods 0.000 abstract description 9
- 230000001052 transient effect Effects 0.000 abstract description 5
- 238000012360 testing method Methods 0.000 description 16
- 238000004088 simulation Methods 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 4
- 230000006698 induction Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000001105 regulatory effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
- G01L5/0038—Force sensors associated with force applying means applying a pushing force
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
A system and a method for measuring stress of a large-sized magnet coil supporting mechanism belong to the field of space magnet coil research. The system comprises a control module, a data acquisition module and a control module, wherein the control module is used for controlling the pulse current and the pulse voltage of the magnet coil, sending a trigger signal to the data acquisition module and setting characteristic parameters of the magnet coil; the data acquisition module is used for acquiring acceleration data output by the acceleration measurement module under the given pulse current and voltage conditions; the acceleration measuring module is used for being fixed on the coil body or the supporting buffer mechanism and outputting a data set of the maximum acceleration of the coil to be detected; and the analysis output module is used for obtaining a data set of the force born by the support buffer structure according to the maximum acceleration data set, extrapolating one by one to calculate the maximum acting force born by the support buffer structure, then obtaining the average value, and finally generating an evaluation report. The invention obtains the maximum acting force of the supporting buffer mechanism based on the acceleration data of the large magnet under the condition of small current transient discharge.
Description
Technical Field
The invention belongs to the field of space magnet coil research, and particularly relates to a system and a method for measuring stress of a large magnet coil supporting mechanism.
Background
The space plasma environment ground simulation and research system is mainly used for researching the basic physical process of the space plasma environment, the characteristics of the extreme plasma environment and related physical processes, such as the research of the magnetic layer top three-dimensional magnetic reconnection problem, the research of the magnetic storm phenomenon, the research of the wave-particle interaction mechanism and the like. The research result of the system has quite important guiding significance for the related research of space physics, improving the understanding of people on space plasma environment and the safety design of spacecrafts.
In the system, 6 kinds of 18 coils are used to realize the magnetic field environment simulation of the earth magnetic layer, wherein the magnetic field environment simulation comprises 4 magnetic sheath polar field coils, 4 magnetic sheath annular field coils, 6 magnetic layer top-level control coils, 1 dipole field coil, 2 magnetic disturbance coils and 1 magnetic mirror field coil (the magnetic mirror field coil is formed by connecting two sub-coils in series and is regarded as one coil). The magnetic field environment of the three-dimensional asymmetric magnetic reconnection experiment requires the mutual matching of the 6 coils, wherein the magnetic sheath pole direction coil, the magnetic sheath ring direction coil and the dipole field coil are matched to generate a background magnetic field, and the magnetic layer top configuration control coil is used for regulating and controlling the distribution of the magnetic field. When the problem of wave-particle interaction is studied, a background magnetic field is constructed by matching a dipole magnetic field coil and a magnetic disturbance coil; when the problem of earth magnetic tail magnetic reconnection is studied, a background magnetic field is constructed by matching a dipole field coil and a magnetic mirror field coil. According to the requirements of a near-earth space plasma environment simulation experiment, the magnetic sheath coil set needs to generate a magnetic field with the magnetic induction intensity of 100G-200G at a position about 0.4 m-1 m away from the surface of the coil set; the dipole field coil needs to generate a magnetic field with magnetic induction intensity of not less than 400G at a position 2 m away from the center of the coil; the magnetic disturbance coil generates a disturbance magnetic field with magnetic induction intensity not less than 100G at the position 2 meters away from the horizontal plane of the central point of the coil in the test area; when 2 series sub-coils of the magnetic mirror field coil are coaxially and symmetrically distributed up and down and are 3m apart, a magnetic field with magnetic induction intensity not less than 200G is required to be generated at the intersection point of the central axes of the two coils and the middle plane.
It can be seen that when the coil assembly is matched to provide a magnetic field environment for a simulation experiment of a near-earth space plasma, the coil itself is subjected to electromagnetic force due to mutual inductance, which presents challenges and requirements for the supporting and buffering mechanism thereof, and to evaluate and verify the performance of the supporting and buffering mechanism of the coil, the acting force born by the supporting and buffering mechanism at the maximum discharge current of the coil needs to be measured. For most magnet coil application scenarios, the coil volume and discharge current are small, so the requirements for the support mechanism are not high. In most plasma physics research devices, the coil is of a structure externally arranged on the vacuum tank, which is quite easy for the design and implementation of a coil fixing and supporting scheme, so that the stress of a coil supporting mechanism during discharge is not required to be measured and monitored generally. And to the condition that the coil is built-in the vacuum tank, and the current that the coil was led to when carrying out the experiment can reach hundreds kiloamperes, transient electromagnetic impact force is very big, and its reliability that supports fixed establishment is relatively lower, need monitor the atress condition of the supporting mechanism of coil. Therefore, how to test the acting force born by the magnet coil supporting and buffering mechanism in actual discharging by adopting a simple, efficient and relatively accurate test system and test method is a very engineering problem, and the solution of the problem can also provide technical reference for other fields with the requirement of measuring the electromagnetic force born by a workpiece.
Disclosure of Invention
The invention aims to solve the problem that the stress of a large-sized magnet coil supporting and buffering mechanism can not be measured under the transient discharge condition, and provides a measuring system and an indirect measuring method for acting force born by the magnet coil supporting and buffering mechanism when a plasma discharge experiment is carried out in a space plasma environment ground simulation device, and meanwhile, the invention provides a data reference for evaluating the reliability and the stability of the coil supporting mechanism.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the system comprises a control module, a data acquisition module, an acceleration measurement module and an analysis output module;
the control module is used for controlling the pulse current and the voltage of the magnet coil, sending a trigger signal to the data acquisition module and setting the characteristic parameters of the magnet coil;
the data acquisition module is used for acquiring acceleration data output by the acceleration measurement module under the given pulse current and voltage conditions;
the acceleration measuring module is used for being fixed on the coil body or the supporting buffer mechanism and outputting a data set of the maximum acceleration of the coil to be detected;
and the analysis output module is used for obtaining a data set of the force born by the support buffer structure according to the maximum acceleration data set, extrapolating one by one to calculate the maximum acting force born by the support buffer structure, then taking the average value, and finally generating an evaluation report.
In the invention, the measuring system comprises an acceleration sensor, a data acquisition card and an upper computer. The acceleration sensor is fixed on the coil supporting mechanism, is connected into the data acquisition card through a BNC wire, performs discharge control on the magnet coil through the upper computer, and obtains an acceleration curve in acceleration sensor control software.
Further, the characteristic parameters refer to the mass of the coil to be tested, the number of the supporting points, the area of the supporting points and the maximum acting force born by the supporting buffer mechanism.
A measuring method of a measuring system for stress of a large magnet coil supporting mechanism comprises the following steps:
the method is based on a acting force measuring system of a magnet coil supporting buffer mechanism, does not need to use theoretical maximum discharge current of the magnet coil for experiments, and is based on the magnitude of the acting force measured by relatively smaller discharge currentExtrapolation is carried out to obtain the stress of the magnet coil supporting buffer mechanism under the condition of maximum discharge current. Taking a magnetic sheath coil as an example, fastening an accelerator sensor on a magnet coil, discharging the magnet coil with a certain voltage and current by adopting a magnet power supply, collecting acceleration signals, filtering signal noise after measuring acceleration data to obtain an oscillating acceleration change curve, and selecting a maximum value a of the acceleration after filtering max As the calculation basis of the stress of the supporting buffer mechanism, the calculation formula is as follows:
F＝m·a max (1)
wherein F is the maximum buffering force (N) of the support buffering mechanism to the magnet, m is the mass (kg) of the magnet coil, a max Is the maximum acceleration (g) acquired;
with theoretical maximum discharge current I of the magnet max Comparing the actual discharge current I t Square η= (I) of ratio max /I t ) 2 As the extrapolation coefficient, the value of the maximum damping force of the coil support damping mechanism is obtained as follows:
F max ＝η·F (2)。
compared with the prior art, the invention has the beneficial effects that: by adopting the testing system and the testing method for the acting force of the magnet supporting and buffering mechanism, the maximum acting force of the supporting and buffering mechanism can be obtained based on the acceleration data of the large magnet under the condition of small-current transient discharge, and the problem that the coil supporting and buffering mechanism can not be tested for the acting force under the severe working condition of transient large-current discharge is solved. In addition, the nondestructive indirect measurement method can relatively accurately evaluate and monitor the performance of the supporting buffer mechanism of the large-sized magnet coil, and provides a technical basis for other similar devices with measurement requirements. The method for acquiring the acting force of the magnet to support the buffer mechanism under the condition of maximum discharge current has great significance for evaluating the performances of the support and buffer mechanism.
Drawings
FIG. 1 is a schematic diagram of a test system for supporting and buffering the stress of a large magnet coil in accordance with the present invention;
fig. 2 is a schematic diagram of a testing flow of the stress of the large magnet coil supporting and buffering mechanism of the present invention.
Detailed Description
The following further illustrates the technical solution of the present invention through the drawings and the embodiments, but is not limited thereto, and all modifications and equivalents of the technical solution of the present invention are included in the protection scope of the present invention without departing from the spirit and scope of the technical solution of the present invention.
Example 1:
as shown in fig. 1, a testing system for a large magnet coil supporting buffer mechanism, the system comprising:
the control module 1 can set the size of the discharge current and the discharge voltage sent by the magnet coil to be detected through the control module 1, send trigger signals to the magnet power supply control system and the data acquisition module 2 of the test system, and can set the quality, the number of supporting points, the area of the supporting points, the maximum acting force born by the supporting buffer mechanism and other characteristic parameters of the coil to be tested through the control module 1.
The data acquisition module 2 can acquire acceleration data of the supporting buffer mechanism through the data acquisition card under different discharge conditions set by the magnet coil to be detected, and extract and output a maximum acceleration value.
The acceleration measuring module 3 can measure the acceleration data of the buffer mechanism supported by the coil to be detected under the corresponding discharge condition through an acceleration sensor with the sensitivity of 50 Mv/g.
The analysis output module 4 can extrapolate the average value of the maximum acting force born by the support buffer structure under the set discharge condition of the magnet according to the maximum acceleration data output by the data acquisition module 2, and generate an evaluation report according to the characteristic parameters such as the supporting point, the supporting point area and the like of the support mechanism.
Example 2:
as shown in fig. 2, a method for testing the stress of a large magnet coil supporting and buffering mechanism is provided, wherein the method adopts a testing system for testing the stress of the large magnet coil supporting and buffering mechanism, a control module (an upper computer) in the testing system is in communication connection with a data acquisition device and an acceleration measurement device, and the method comprises the following steps:
step S1: the acceleration sensor is fastened at a proper position on the magnet coil to be detected and is in communication connection with the data acquisition module;
step S2: inputting test parameters into a control module according to the mass of the magnet coil to be tested, the number of supporting points, the area of the supporting points and the maximum bearing force of the supporting buffer mechanism;
step S3: discharging the magnet coil with a certain voltage and current, and testing for multiple times under different discharging conditions;
step S4: collecting acceleration signals output by an acceleration sensor under different discharge parameters;
step S5: noise filtering is carried out on acceleration signals collected under different discharge parameters, and a band-pass filter (0-100 Hz) is selected;
step S6: extracting the maximum acceleration value of the supporting buffer mechanism under different discharge parameters from the filtered acceleration data;
step S7: according to the input test parameters and the collected maximum acceleration values, extrapolating the maximum acting force born by the supporting buffer mechanism under different discharge parameters, and taking an average value;
step S8: and generating a stress evaluation report of the magnet supporting buffer mechanism according to the extrapolation result.
Claims (3)
1. A measuring system of large-scale magnet coil supporting mechanism atress, its characterized in that: the system comprises a control module, a data acquisition module, an acceleration measurement module and an analysis output module;
the control module is used for controlling the pulse current and the voltage of the magnet coil, sending a trigger signal to the data acquisition module and setting the characteristic parameters of the magnet coil;
the data acquisition module is used for acquiring acceleration data output by the acceleration measurement module under the given pulse current and voltage conditions;
the acceleration measuring module is used for being fixed on the coil body or the supporting buffer mechanism and outputting a data set of the maximum acceleration of the coil to be detected;
and the analysis output module is used for obtaining a data set of the force born by the support buffer structure according to the maximum acceleration data set, extrapolating one by one to calculate the maximum acting force born by the support buffer structure, then taking the average value, and finally generating an evaluation report.
2. A large magnet coil support mechanism stress measurement system according to claim 1, wherein: the characteristic parameters refer to the mass of the coil to be tested, the number of the supporting points, the area of the supporting points and the maximum acting force born by the supporting buffer mechanism.
3. A method of measuring a force-bearing measurement system using the large magnet coil support mechanism of claim 1 or 2, characterized in that: the method comprises the following steps:
fastening an accelerator sensor on a magnet coil, discharging the magnet coil with a certain voltage and current by using a magnet power supply, collecting acceleration signals, filtering signal noise after measuring acceleration data to obtain an oscillating acceleration change curve, and selecting a maximum value a of the filtered acceleration max As the calculation basis of the stress of the supporting buffer mechanism, the calculation formula is as follows:
F＝m·a max (1)
wherein F is the maximum buffering force (N) of the support buffering mechanism to the magnet, m is the mass (kg) of the magnet coil, a max Is the maximum acceleration (g) acquired;
with theoretical maximum discharge current I of the magnet max Comparing the actual discharge current I t Square η= (I) of ratio max /I t ) 2 As the extrapolation coefficient, the value of the maximum damping force of the coil support damping mechanism is obtained as follows:
F max ＝η·F (2)。
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310306984.5A CN116519183A (en) | 2023-03-27 | 2023-03-27 | System and method for measuring stress of large-sized magnet coil supporting mechanism |
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| CN202310306984.5A CN116519183A (en) | 2023-03-27 | 2023-03-27 | System and method for measuring stress of large-sized magnet coil supporting mechanism |
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- 2023-03-27 CN CN202310306984.5A patent/CN116519183A/en active Pending
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