CN116153041B - Pull rod emergency early warning system for superconducting magnet - Google Patents
Pull rod emergency early warning system for superconducting magnet Download PDFInfo
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- CN116153041B CN116153041B CN202310402458.9A CN202310402458A CN116153041B CN 116153041 B CN116153041 B CN 116153041B CN 202310402458 A CN202310402458 A CN 202310402458A CN 116153041 B CN116153041 B CN 116153041B
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B31/00—Predictive alarm systems characterised by extrapolation or other computation using updated historic data
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/182—Level alarms, e.g. alarms responsive to variables exceeding a threshold
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F6/04—Cooling
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
Abstract
The application relates to the technical field of superconducting magnets, and discloses a pull rod emergency early warning system for a superconducting magnet, which comprises the following components: the information acquisition module is used for acquiring basic characteristic information, and the processing module is used for carrying out data analysis based on the basic characteristic information; setting a preset tensile force F based on the relation between the real-time cold mass and the preset cold mass; setting an emergency early warning level based on the relation between the real-time tension and the preset tension; setting a correction coefficient based on the relation between the length L of the pull rod and the preset length to correct the emergency early warning grade; when the cold mass operation is in a preset temperature range, calculating cold shrinkage stress, calculating temperature difference stress, and setting a warning message grade based on the relation between the temperature difference stress and the preset temperature difference stress; and the output module is used for outputting early warning information, wherein the early warning information comprises emergency early warning grade information and warning message grade information. The application pre-warns the fracture of the pull rod in advance, and avoids the influence of the sudden fracture of the pull rod on the work of the superconducting magnet.
Description
Technical Field
The application relates to the technical field of superconducting magnets, in particular to a pull rod emergency early warning system for a superconducting magnet.
Background
In superconducting magnets, the hanging structure composed of tie rods mainly serves to limit the degree of freedom of the cold mass. When the magnet system works normally, the pull rod is mainly stressed by the dead weight and the cold shrinkage force of the cold mass and the pretightening force applied in the installation process. In the transportation process, the pull rod can bear dynamic loads in different directions, so that the stress condition on the pull rod is very complex.
Fracture may occur when the tension rod is stressed far less than the yield stress, which is generally referred to as fatigue fracture, and is the most common form of failure of the tension rod. Most of fatigue fracture of the pull rod happens suddenly, and obvious characteristics are difficult to detect. If the pull rod is broken, the Dewar can be in direct contact with the cold screen and the 300K outer sleeve, the possibility of heat leakage is increased, and potential safety hazards such as overtime are easily caused.
Disclosure of Invention
The application provides a pull rod emergency early warning system for a superconducting magnet, which is used for early warning the breakage of the pull rod in advance and avoiding the influence of the sudden breakage of the pull rod on the work of the superconducting magnet.
In order to achieve the above object, the present application provides the following solutions: the application provides a pull rod emergency early warning system for a superconducting magnet, which comprises the following components: the information acquisition module is used for acquiring basic characteristic information, wherein the basic characteristic information comprises a cold mass M, a tensile force applied to the pull rod, a cold end temperature TL of the pull rod, a warm end temperature TN of the pull rod and a length L of the pull rod;
the processing module is used for carrying out data analysis based on the basic characteristic information; comprises a step of setting a preset tension F based on the relation between the real-time cold mass and the preset cold mass; setting an emergency early warning level based on the relation between the real-time tension and the preset tension; setting a correction coefficient based on the relation between the length L of the pull rod and the preset length to correct the emergency early warning grade; when the cold mass operation is in a preset temperature range, calculating cold shrinkage stress by adopting an approximate calculation method, and performing finite element analysis to calculate temperature difference stress; setting a warning message grade based on the relation between the temperature difference stress and the preset temperature difference stress;
and the output module is used for outputting early warning information, wherein the early warning information comprises emergency early warning grade information and warning message grade information.
In one embodiment, the preset tension force F is set based on a relationship between the real-time cold mass and the preset cold mass; presetting a preset cold mass matrix M0, and setting M0 (M1, M2, M3 and M4), wherein M1 is a first preset cold mass, M2 is a second preset cold mass, M3 is a third preset cold mass, and M4 is a fourth preset cold mass, wherein M1 is more than M2 and less than M3 is more than M4; presetting a preset tension matrix F0, and setting F0 (F1, F2, F3 and F4), wherein F1 is a first preset tension, F2 is a second preset tension, F3 is a third preset tension, F4 is a fourth preset tension, and F1 is less than F2 and less than F3 and less than F4;
setting a preset tensile force F according to the relation between the cold mass M and each preset cold mass: when M is smaller than M1, selecting the first preset tension F1 as the preset tension F; when M1 is less than or equal to M2, selecting the second preset tension F2 as the preset tension F; when M2 is less than or equal to M3, selecting the third preset tension F3 as the preset tension F; and when M3 is less than or equal to M4, selecting the fourth preset tension F4 as the preset tension F.
In one embodiment, the emergency pre-warning level is set based on a relationship between the real-time tension and the preset tension; presetting a preset emergency early warning level matrix G0, and setting G0= (G1, G2, G3 and G4), wherein G1 is a first preset emergency early warning level, G2 is a second preset emergency early warning level, G3 is a third preset emergency early warning level, G4 is a fourth preset emergency early warning level, and G1 is less than G2 and less than G3 is less than G4;
setting an emergency early warning grade G according to the relation between the real-time tension f and each preset tension: when f=f1, selecting the first preset emergency early warning level G1 as an emergency early warning level G; when f=f2, selecting the second preset emergency early warning level G2 as an emergency early warning level G; when f=f3, selecting the third preset emergency early warning level G3 as the emergency early warning level G; when f=f4, the fourth preset emergency pre-warning level G4 is selected as the emergency pre-warning level G.
In one embodiment, setting a correction coefficient based on the relationship between the length L of the pull rod and the preset length of the pull rod to correct the emergency early warning level; presetting a preset pull rod length matrix L0, and setting L0 (L1, L2, L3 and L4) for the preset pull rod length matrix L0, wherein L1 is a first preset pull rod length, L2 is a second preset pull rod length, L3 is a third preset pull rod length, L4 is a fourth preset pull rod length, and L1 is more than L2 and less than L3 and less than L4; presetting a preset correction coefficient matrix ai, and setting ai (a 1, a2, a3 and a 4) for the preset correction coefficient matrix ai, wherein a1 is a first preset correction coefficient, a2 is a second preset correction coefficient, a3 is a third preset correction coefficient, a4 is a fourth preset correction coefficient, and a1 is more than a2 and less than a3 and less than a4;
selecting an ith preset correction coefficient according to the relation between the length L of the pull rod and the length of each preset pull rod to correct the emergency early warning grade G, wherein i=1, 2,3 and 4; when L is smaller than L1, the first preset correction coefficient a1 is selected to correct the emergency early warning grade G, and the corrected emergency early warning grade is G x a1; when L1 is less than or equal to L2, the second preset correction coefficient a2 is selected to correct the emergency early warning grade G, and the corrected emergency early warning grade is G.a2; when L2 is less than or equal to L3, the third preset correction coefficient a3 is selected to correct the emergency early warning grade G, and the corrected emergency early warning grade is G.a3; when L3 is less than or equal to L4, the fourth preset correction coefficient a4 is selected to correct the emergency early warning grade G, and the corrected emergency early warning grade is G.a4.
In one embodiment, when the warning message level is set based on the relationship between the temperature differential stress and the preset temperature differential stress; presetting a preset temperature difference stress matrix W0, and setting W0= (W1, W2, W3 and W4), wherein W1 is a first preset temperature difference stress, W2 is a second preset temperature difference stress, W3 is a third preset temperature difference stress, and W4 is a fourth preset temperature difference stress, wherein W1 is less than W2 and less than W3 is less than W4; presetting a preset warning message grade matrix Y0, and setting Y0= (Y1, Y2, Y3 and Y4), wherein Y1 is a first preset warning message grade, Y2 is a second preset warning message grade, Y3 is a third preset warning message grade, Y4 is a fourth preset warning message grade, and Y1 is more than Y2 and less than Y3 and less than Y4;
setting a warning message grade Y according to the relation between the temperature difference stress W and each preset temperature difference stress: when W is less than W1, selecting the first preset warning message grade Y1 as a warning message grade Y; when W1 is less than or equal to W2, selecting the second preset warning message grade Y2 as a warning message grade Y; when W2 is less than or equal to W3, selecting the third preset warning message grade Y3 as a warning message grade Y; and when W3 is less than or equal to W4, selecting the fourth preset warning message grade Y4 as the warning message grade Y.
In one embodiment, the processing module is further configured to set a correction coefficient based on a relationship between a low-temperature time and a preset low-temperature time to correct the warning message level; setting low-temperature early warning based on the relation between the cold end temperature TL of the pull rod and a preset low temperature; and setting high-temperature early warning based on the relation between the temperature TN of the warm end of the pull rod and the preset high temperature.
In one embodiment, when the warning message level is corrected by setting a correction coefficient based on the relationship between the low-temperature time and the preset low-temperature time; presetting a preset low-temperature time matrix T0, and setting T0 (T1, T2, T3 and T4) for the preset low-temperature time matrix T0, wherein T1 is a first preset low-temperature time, T2 is a second preset low-temperature time, T3 is a third preset low-temperature time, T4 is a fourth preset low-temperature time, and T1 is more than T2 and less than T3 and less than T4; presetting a preset correction coefficient matrix bi, and setting bi (b 1, b2, b3 and b 4) for the preset correction coefficient matrix bi, wherein b1 is a first preset correction coefficient, b2 is a second preset correction coefficient, b3 is a third preset correction coefficient, b4 is a fourth preset correction coefficient, and b1 is more than b2 and less than b3 and less than b4;
selecting an ith preset correction coefficient according to the relation between the low-temperature time T and each preset low-temperature time to correct the warning message grade Y, wherein i=1, 2,3 and 4; when T is smaller than T1, the first preset correction coefficient b1 is selected to correct the warning message grade Y, and the corrected warning message grade is Y x b1; when T1 is less than or equal to T2, selecting the second preset correction coefficient b2 to correct the warning message grade Y, wherein the corrected warning message grade is Y x b2; when T2 is less than or equal to T3, selecting the third preset correction coefficient b3 to correct the warning message grade Y, wherein the corrected warning message grade is Y x b3; when T3 is less than or equal to T4, the fourth preset correction coefficient b4 is selected to correct the warning message grade Y, and the corrected warning message grade is Y x b4.
In one embodiment, the information acquisition module comprises a tension acquisition device, wherein the tension acquisition device is used for acquiring tension applied to the pull rod; the temperature detection device is used for acquiring the cold end temperature TL of the pull rod and the warm end temperature TN of the pull rod; the pull rod stretching amount measuring device is used for obtaining the length L of the pull rod.
In one embodiment, the tie rod is a titanium alloy material.
In one embodiment, the processing module is further configured to count a usage time t of the pull rod, and set a discard time of the pull rod based on a relationship between the usage time and a preset time.
The application has the technical effects that: setting an emergency early warning level based on the relation between the real-time tension and the preset tension; setting a correction coefficient based on the relation between the length L of the pull rod and the preset length to correct the emergency early warning grade, so as to realize early warning of the breakage of the pull rod; and setting a warning message grade based on the relation between the temperature difference stress and the preset temperature difference stress, and carrying out early warning on the pull rod fracture again. The superconducting magnet is prevented from being broken suddenly during operation, so that load distribution unbalance of the pull rod is caused, stability of the superconducting magnet is affected, and potential safety hazards of the superconducting magnet are caused.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a pull rod emergency pre-warning system for a superconducting magnet according to an embodiment of the present application.
Detailed Description
The following describes in further detail the embodiments of the present application with reference to the drawings and examples. The following examples are illustrative of the application and are not intended to limit the scope of the application.
In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
In superconducting magnet systems, the main function of the tie-rods is to fix the magnet, liquid helium vessel, cold shield, etc. When the magnet system works normally, the main stress of the pull rod for fixing the liquid helium container is from the dead weight and the cold contraction force of the system and the pretightening force applied in the installation process, and the pull rod is subjected to dynamic loading forces from different directions in the transportation process.
As shown in fig. 1, the present embodiment discloses a pull rod emergency pre-warning system for a superconducting magnet, including: the information acquisition module is used for acquiring basic characteristic information, wherein the basic characteristic information comprises a cold mass M, a tensile force applied to the pull rod, a cold end temperature TL of the pull rod, a warm end temperature TN of the pull rod and a length L of the pull rod;
the processing module is used for carrying out data analysis based on the basic characteristic information; comprises a step of setting a preset tension F based on the relation between the real-time cold mass and the preset cold mass; setting an emergency early warning level based on the relation between the real-time tension and the preset tension; setting a correction coefficient based on the relation between the length L of the pull rod and the preset length to correct the emergency early warning grade; when the cold mass operation is in a preset temperature range, calculating cold shrinkage stress by adopting an approximate calculation method, and performing finite element analysis to calculate temperature difference stress; setting a warning message grade based on the relation between the temperature difference stress and the preset temperature difference stress;
and the output module is used for outputting early warning information, wherein the early warning information comprises emergency early warning grade information and warning message grade information.
It will be appreciated that in the above embodiments, the cold mass M includes the mass of the magnet, the liquid helium vessel and the liquid helium; the cold end of the pull rod is connected with the liquid helium container, the warm end of the pull rod is connected with the vacuum container, the temperature TL of the cold end of the pull rod is approximately equal to the temperature of the outer surface of the liquid helium container, and the temperature TN of the warm end of the pull rod is approximately equal to the temperature of the outer surface of the vacuum container; the pulling force applied to the pull rod is the sum of the detected pulling force, namely the gravity of the cold mass, the cold shrinkage force during low-temperature operation, the force caused by transportation or impact acceleration (the change of the force on the pull rod when the magnet has acceleration in a certain direction) and the pretightening force.
Setting a preset tensile force F based on the relation between the real-time cold mass and the preset cold mass; setting an emergency early warning level based on the relation between the real-time tension and the preset tension; setting a correction coefficient based on the relation between the length L of the pull rod and the preset length to correct the emergency early warning grade, so that the accuracy of determining the emergency early warning grade is improved; the accuracy of setting the warning message grade is improved by setting the warning message grade based on the relation between the temperature difference stress and the preset temperature difference stress. The early warning of the breakage of the pull rod is realized through the emergency early warning grade information and the warning message grade information, and the influence of the sudden breakage of the pull rod on the work of the superconducting magnet is avoided.
In some embodiments, the preset tension force F is set based on a relationship between the real-time cold mass and the preset cold mass; presetting a preset cold mass matrix M0, and setting M0 (M1, M2, M3 and M4), wherein M1 is a first preset cold mass, M2 is a second preset cold mass, M3 is a third preset cold mass, and M4 is a fourth preset cold mass, wherein M1 is more than M2 and less than M3 is more than M4; presetting a preset tension matrix F0, and setting F0 (F1, F2, F3 and F4), wherein F1 is a first preset tension, F2 is a second preset tension, F3 is a third preset tension, F4 is a fourth preset tension, and F1 is less than F2 and less than F3 and less than F4;
setting a preset tensile force F according to the relation between the cold mass M and each preset cold mass: when M is smaller than M1, selecting the first preset tension F1 as the preset tension F; when M1 is less than or equal to M2, selecting the second preset tension F2 as the preset tension F; when M2 is less than or equal to M3, selecting the third preset tension F3 as the preset tension F; and when M3 is less than or equal to M4, selecting the fourth preset tension F4 as the preset tension F.
It will be appreciated that in the above embodiments, by data analysis of various types of superconducting magnets, it is determined that the relationship between the cold mass M and the tension force to which the tie rod is subjected is such that the greater the cold mass M, the greater the tension force to which the tie rod is subjected. And setting a preset tension force F according to the relation between the cold mass M and each preset cold mass, and improving the accuracy of the determination of the preset tension force F.
Specifically, a preset cold mass matrix M0 is preset, M0 (1, 2,3, 4) is set, wherein 1 is a first preset cold mass, 2 is a second preset cold mass, 3 is a third preset cold mass, 4 is a fourth preset cold mass, and 1 is more than 2 and less than 3 and less than 4, and the unit is ton; presetting a preset tension matrix F0 and setting F0 (3000,6000,9000,12000), wherein 3000 is a first preset tension, 6000 is a second preset tension, 9000 is a third preset tension, 12000 is a fourth preset tension, 3000 is more than 6000 and less than 9000 is less than 12000, and N is a unit;
setting a preset tensile force F according to the relation between the cold mass M and each preset cold mass: when M is less than 1, selecting the first preset tension 3000 as a preset tension F; when M is more than or equal to 1 and less than 2, selecting the second preset tension 6000 as a preset tension F; when M is more than or equal to 2 and less than 3, selecting the third preset tension 9000 as a preset tension F; when M is more than or equal to 3 and less than 4, the fourth preset tension 12000 is selected as the preset tension F.
It should be noted that the solution of the above preferred embodiment is only one specific implementation manner proposed by the present application, and those skilled in the art may select other preset cold mass matrix M0 and preset tensile force F0 according to actual situations, which does not affect the protection scope of the present application.
In some embodiments, the emergency alert level is set based on a relationship between the real-time tension and the preset tension; presetting a preset tension matrix F0, and setting F0= (F1, F2, F3 and F4), wherein F1 is a first preset tension, F2 is a second preset tension, F3 is a third preset tension, and F4 is a fourth preset tension, wherein F1 is less than F2 and less than F3 and less than F4; presetting a preset emergency early warning level matrix G0, and setting G0= (G1, G2, G3 and G4), wherein G1 is a first preset emergency early warning level, G2 is a second preset emergency early warning level, G3 is a third preset emergency early warning level, G4 is a fourth preset emergency early warning level, and G1 is less than G2 and less than G3 is less than G4;
setting an emergency early warning grade G according to the relation between the real-time tension f and each preset tension: when f=f1, selecting the first preset emergency early warning level G1 as an emergency early warning level G; when f=f2, selecting the second preset emergency early warning level G2 as an emergency early warning level G; when f=f3, selecting the third preset emergency early warning level G3 as the emergency early warning level G; when f=f4, the fourth preset emergency pre-warning level G4 is selected as the emergency pre-warning level G.
It can be understood that in the above embodiment, the emergency early warning level G is set according to the relationship between the real-time tension f and each preset tension, so that the accuracy of setting the emergency early warning level G is improved.
It should be noted that, the scheme of the above preferred embodiment is only one specific implementation manner provided by the present application, and a person skilled in the art may select other preset tension matrix F0 and emergency pre-warning level matrix G0 according to actual situations, which does not affect the protection scope of the present application.
In some specific embodiments, setting a correction coefficient based on the relationship between the length L of the pull rod and the preset pull rod length to correct the emergency early warning level; presetting a preset pull rod length matrix L0, and setting L0 (L1, L2, L3 and L4) for the preset pull rod length matrix L0, wherein L1 is a first preset pull rod length, L2 is a second preset pull rod length, L3 is a third preset pull rod length, L4 is a fourth preset pull rod length, and L1 is more than L2 and less than L3 and less than L4; presetting a preset correction coefficient matrix ai, and setting ai (a 1, a2, a3 and a 4) for the preset correction coefficient matrix ai, wherein a1 is a first preset correction coefficient, a2 is a second preset correction coefficient, a3 is a third preset correction coefficient, a4 is a fourth preset correction coefficient, and a1 is more than a2 and less than a3 and less than a4;
selecting an ith preset correction coefficient according to the relation between the length L of the pull rod and the length of each preset pull rod to correct the emergency early warning grade G, wherein i=1, 2,3 and 4; when L is smaller than L1, the first preset correction coefficient a1 is selected to correct the emergency early warning grade G, and the corrected emergency early warning grade is G x a1; when L1 is less than or equal to L2, the second preset correction coefficient a2 is selected to correct the emergency early warning grade G, and the corrected emergency early warning grade is G.a2; when L2 is less than or equal to L3, the third preset correction coefficient a3 is selected to correct the emergency early warning grade G, and the corrected emergency early warning grade is G.a3; when L3 is less than or equal to L4, the fourth preset correction coefficient a4 is selected to correct the emergency early warning grade G, and the corrected emergency early warning grade is G.a4.
It can be understood that in the above embodiment, the i-th preset correction coefficient is selected according to the relationship between the length L of the pull rod and the length of each preset pull rod to correct the emergency early warning level G, so as to further improve the accuracy of setting the emergency early warning level G.
Specifically, because the process of stretch breaking includes four stages of an elastic stage, a yield stage, a strengthening stage, and a necking (breaking) stage; the preset correction factor increases with the deepening of the stretch-break phase, wherein the correction factors of the yield phase, the strengthening phase and the necking (breaking) phase are greater than 1. If L is in the range of 2-8mm, 5mm is the beginning of the yielding stage, a preset pull rod length matrix L0 is preset for the situation, and L0 (2 mm,5mm,7mm and 8 mm) is set for the preset pull rod length matrix L0, wherein 2mm is the first preset pull rod length, 5mm is the second preset pull rod length, 7mm is the third preset pull rod length, 8mm is the fourth preset pull rod length, and 2mm is less than 5mm and less than 7mm is less than 8mm; presetting a preset correction coefficient matrix ai, and setting ai (0.9,1,1.1,1.2) for the preset correction coefficient matrix ai, wherein 0.9 is a first preset correction coefficient, 1 is a second preset correction coefficient, 1.1 is a third preset correction coefficient, 1.2 is a fourth preset correction coefficient, and 0.9 is more than 1 and less than 1.1 is less than 1.2;
selecting an ith preset correction coefficient according to the relation between the length L of the pull rod and the length of each preset pull rod to correct the emergency early warning grade G, wherein i=1, 2,3 and 4; when L is less than 2mm, the first preset correction coefficient 0.9 is selected to correct the emergency early warning grade G, and the corrected emergency early warning grade G is 0.9; when L is less than or equal to 2mm and less than 5mm, the second preset correction coefficient 1 is selected to correct the emergency early warning grade G, and the corrected emergency early warning grade is G1; when L is more than or equal to 5mm and less than 7mm, the third preset correction coefficient 1.1 is selected to correct the emergency early warning grade G, and the corrected emergency early warning grade G is 1.1; when L is more than or equal to 7mm and less than 8mm, the fourth preset correction coefficient 1.2 is selected to correct the emergency early warning grade G, and the corrected emergency early warning grade G is 1.2.
It should be noted that, the solution of the above preferred embodiment is only one specific implementation manner proposed by the present application, and a person skilled in the art may select other preset pull rod length matrix L0 and preset correction coefficient matrix ai according to actual situations, which does not affect the protection scope of the present application.
In some embodiments, when the warning message level is set based on the relationship of the differential thermal stress to the preset differential thermal stress; presetting a preset temperature difference stress matrix W0, and setting W0= (W1, W2, W3 and W4), wherein W1 is a first preset temperature difference stress, W2 is a second preset temperature difference stress, W3 is a third preset temperature difference stress, and W4 is a fourth preset temperature difference stress, wherein W1 is less than W2 and less than W3 is less than W4; presetting a preset warning message grade matrix Y0, and setting Y0= (Y1, Y2, Y3 and Y4), wherein Y1 is a first preset warning message grade, Y2 is a second preset warning message grade, Y3 is a third preset warning message grade, Y4 is a fourth preset warning message grade, and Y1 is more than Y2 and less than Y3 and less than Y4;
setting a warning message grade Y according to the relation between the temperature difference stress W and each preset temperature difference stress: when W is less than W1, selecting the first preset warning message grade Y1 as a warning message grade Y; when W1 is less than or equal to W2, selecting the second preset warning message grade Y2 as a warning message grade Y; when W2 is less than or equal to W3, selecting the third preset warning message grade Y3 as a warning message grade Y; and when W3 is less than or equal to W4, selecting the fourth preset warning message grade Y4 as the warning message grade Y.
It can be understood that in the above embodiment, the preset temperature range is a temperature at which both the cold mass and the pull rod generate cold shrinkage, and because the vacuum container is strong enough, the pull rod installation position is hardly changed, which inevitably causes the pull rod to be stretched at a low temperature to generate a cold shrinkage force, and the cold shrinkage force includes a pull rod stress caused by the cold mass shrinkage, and the cold shrinkage stress of the pull rod itself is negligible because of the small deformation of the cold mass. Therefore, the cold shrinkage force of the pull rod is calculated to obtain the temperature difference stress, and the warning message grade Y is set according to the relation between the temperature difference stress W and each preset temperature difference stress, so that the accuracy of setting the warning message grade Y can be improved.
It should be noted that the solution of the above preferred embodiment is only one specific implementation manner proposed by the present application, and those skilled in the art may select other preset temperature difference stress matrix W0 and preset warning message level matrix Y0 according to actual situations, which does not affect the protection scope of the present application.
In some specific embodiments, the processing module is further configured to set a correction coefficient to correct the warning message level based on a relationship between a low temperature time and a preset low temperature time; setting low-temperature early warning based on the relation between the cold end temperature TL of the pull rod and a preset low temperature; and setting high-temperature early warning based on the relation between the temperature TN of the warm end of the pull rod and the preset high temperature.
It can be understood that in the above embodiment, the low-temperature early warning is set based on the relationship between the cold end temperature TL of the pull rod and the preset low temperature, and the working state of the liquid helium container is early warned; and setting high-temperature early warning based on the relation between the warm end temperature TN of the pull rod and the preset high temperature, and carrying out early warning on the working state of the vacuum container.
In some embodiments, when the warning message level is corrected by setting a correction coefficient based on a relationship between a low temperature time and a preset low temperature time; presetting a preset low-temperature time matrix T0, and setting T0 (T1, T2, T3 and T4) for the preset low-temperature time matrix T0, wherein T1 is a first preset low-temperature time, T2 is a second preset low-temperature time, T3 is a third preset low-temperature time, T4 is a fourth preset low-temperature time, and T1 is more than T2 and less than T3 and less than T4; presetting a preset correction coefficient matrix bi, and setting bi (b 1, b2, b3 and b 4) for the preset correction coefficient matrix bi, wherein b1 is a first preset correction coefficient, b2 is a second preset correction coefficient, b3 is a third preset correction coefficient, b4 is a fourth preset correction coefficient, and b1 is more than b2 and less than b3 and less than b4;
selecting an ith preset correction coefficient according to the relation between the low-temperature time T and each preset low-temperature time to correct the warning message grade Y, wherein i=1, 2,3 and 4; when T is smaller than T1, the first preset correction coefficient b1 is selected to correct the warning message grade Y, and the corrected warning message grade is Y x b1; when T1 is less than or equal to T2, selecting the second preset correction coefficient b2 to correct the warning message grade Y, wherein the corrected warning message grade is Y x b2; when T2 is less than or equal to T3, selecting the third preset correction coefficient b3 to correct the warning message grade Y, wherein the corrected warning message grade is Y x b3; when T3 is less than or equal to T4, the fourth preset correction coefficient b4 is selected to correct the warning message grade Y, and the corrected warning message grade is Y x b4.
It can be understood that in the above embodiment, the cold shrink force does not act on the pull rod immediately, so the longer the preset temperature range of the pull rod body is, the larger the effect of the cold shrink force on the pull rod is, so the i-th preset correction coefficient is selected according to the relationship between the low temperature time T and each preset low temperature time to correct the warning message grade Y, so as to improve the accuracy of setting the warning message grade Y.
It should be noted that, the scheme of the above preferred embodiment is only one specific implementation manner proposed by the present application, and a person skilled in the art may select other preset low-temperature time matrix T0 and preset correction coefficient matrix bi according to actual situations, which does not affect the protection scope of the present application.
In some embodiments, the information acquisition module includes a tension acquisition device, where the tension acquisition device is configured to acquire a tension applied to the tension rod; the temperature detection device is used for acquiring the cold end temperature TL of the pull rod and the warm end temperature TN of the pull rod; the pull rod stretching amount measuring device is used for obtaining the length L of the pull rod.
It will be appreciated that in the above embodiments, the tension collecting device, the temperature detecting device and the tension measuring device are all of the prior art.
In some embodiments, the tie rod is a titanium alloy material.
It will be appreciated that in the above embodiments, titanium alloys refer to a wide variety of alloying metals made from titanium and other metals. The titanium alloy has high heat strength, can still maintain the required strength at medium temperature, can work for a long time at 450-500 ℃, and has high specific strength at 150-500 ℃; the low-temperature performance is good, and the mechanical properties of the titanium alloy can be maintained at low temperature and ultralow temperature. Titanium alloys with good low temperature properties and extremely low interstitial elements, such as TA7, can also maintain a certain plasticity at-253 ℃. Therefore, the pull rod made of the titanium alloy material can meet the use requirement of the pull rod.
In some embodiments, the processing module is further configured to count a usage time t of the pull rod, and set a discard time of the pull rod based on a relationship between the usage time and a preset time.
It will be appreciated that in the above embodiment, the longer the use time of the tie rod, the greater the possibility of breakage, so the time to discard the tie rod is set based on the relationship between the use time and the preset time, and the possibility of breakage of the tie rod is reduced.
It should be understood that, although the steps in the flowcharts of the embodiments of the present application are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in various embodiments may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor do the order in which the sub-steps or stages are performed need to be sequential, but may be performed in rotation or alternating with at least a portion of the sub-steps or stages of other steps or steps.
Those of ordinary skill in the art will appreciate that: the above is only a preferred embodiment of the present application, and the present application is not limited thereto, but it is to be understood that the present application is described in detail with reference to the foregoing embodiments, and modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (6)
1. A tie rod emergency alert system for a superconducting magnet, comprising:
the information acquisition module is used for acquiring basic characteristic information, wherein the basic characteristic information comprises a cold mass M, a tensile force applied to the pull rod, a cold end temperature TL of the pull rod, a warm end temperature TN of the pull rod and a length L of the pull rod;
the processing module is used for carrying out data analysis based on the basic characteristic information; comprises a step of setting a preset tension F based on the relation between the real-time cold mass and the preset cold mass; setting an emergency early warning level based on the relation between the real-time tension and the preset tension; setting a correction coefficient based on the relation between the length L of the pull rod and the preset length to correct the emergency early warning grade; when the cold mass operation is in a preset temperature range, calculating cold shrinkage stress by adopting an approximate calculation method, and performing finite element analysis to calculate temperature difference stress; setting a warning message grade based on the relation between the temperature difference stress and the preset temperature difference stress;
the output module is used for outputting early warning information, wherein the early warning information comprises emergency early warning grade information and warning message grade information;
setting a preset tensile force F based on the relation between the real-time cold mass and the preset cold mass;
presetting a preset cold mass matrix M0, and setting M0 (M1, M2, M3 and M4), wherein M1 is a first preset cold mass, M2 is a second preset cold mass, M3 is a third preset cold mass, and M4 is a fourth preset cold mass, wherein M1 is more than M2 and less than M3 is more than M4;
presetting a preset tension matrix F0, and setting F0 (F1, F2, F3 and F4), wherein F1 is a first preset tension, F2 is a second preset tension, F3 is a third preset tension, F4 is a fourth preset tension, and F1 is less than F2 and less than F3 and less than F4;
setting a preset tensile force F according to the relation between the cold mass M and each preset cold mass:
when M is smaller than M1, selecting the first preset tension F1 as the preset tension F;
when M1 is less than or equal to M2, selecting the second preset tension F2 as the preset tension F;
when M2 is less than or equal to M3, selecting the third preset tension F3 as the preset tension F;
when M3 is less than or equal to M4, selecting the fourth preset tension F4 as the preset tension F;
setting an emergency early warning level based on the relation between the real-time tension and the preset tension;
presetting a preset emergency early warning level matrix G0, and setting G0= (G1, G2, G3 and G4), wherein G1 is a first preset emergency early warning level, G2 is a second preset emergency early warning level, G3 is a third preset emergency early warning level, G4 is a fourth preset emergency early warning level, and G1 is less than G2 and less than G3 is less than G4;
setting an emergency early warning grade G according to the relation between the real-time tension f and each preset tension:
when f=f1, selecting the first preset emergency early warning level G1 as an emergency early warning level G;
when f=f2, selecting the second preset emergency early warning level G2 as an emergency early warning level G;
when f=f3, selecting the third preset emergency early warning level G3 as the emergency early warning level G;
when f=f4, selecting the fourth preset emergency early warning level G4 as the emergency early warning level G;
setting a correction coefficient based on the relation between the length L of the pull rod and the preset length of the pull rod, and correcting the emergency early warning level;
presetting a preset pull rod length matrix L0, and setting L0 (L1, L2, L3 and L4) for the preset pull rod length matrix L0, wherein L1 is a first preset pull rod length, L2 is a second preset pull rod length, L3 is a third preset pull rod length, L4 is a fourth preset pull rod length, and L1 is more than L2 and less than L3 and less than L4;
presetting a preset correction coefficient matrix ai, and setting ai (a 1, a2, a3 and a 4) for the preset correction coefficient matrix ai, wherein a1 is a first preset correction coefficient, a2 is a second preset correction coefficient, a3 is a third preset correction coefficient, a4 is a fourth preset correction coefficient, and a1 is more than a2 and less than a3 and less than a4;
selecting an ith preset correction coefficient according to the relation between the length L of the pull rod and the length of each preset pull rod to correct the emergency early warning grade G, wherein i=1, 2,3 and 4;
when L is smaller than L1, the first preset correction coefficient a1 is selected to correct the emergency early warning grade G, and the corrected emergency early warning grade is G x a1;
when L1 is less than or equal to L2, the second preset correction coefficient a2 is selected to correct the emergency early warning grade G, and the corrected emergency early warning grade is G.a2;
when L2 is less than or equal to L3, the third preset correction coefficient a3 is selected to correct the emergency early warning grade G, and the corrected emergency early warning grade is G.a3;
when L3 is less than or equal to L4, the fourth preset correction coefficient a4 is selected to correct the emergency early warning grade G, and the corrected emergency early warning grade is G.a4;
setting a warning message grade based on the relation between the temperature difference stress and the preset temperature difference stress;
presetting a preset temperature difference stress matrix W0, and setting W0= (W1, W2, W3 and W4), wherein W1 is a first preset temperature difference stress, W2 is a second preset temperature difference stress, W3 is a third preset temperature difference stress, and W4 is a fourth preset temperature difference stress, wherein W1 is less than W2 and less than W3 is less than W4;
presetting a preset warning message grade matrix Y0, and setting Y0= (Y1, Y2, Y3 and Y4), wherein Y1 is a first preset warning message grade, Y2 is a second preset warning message grade, Y3 is a third preset warning message grade, Y4 is a fourth preset warning message grade, and Y1 is more than Y2 and less than Y3 and less than Y4;
setting a warning message grade Y according to the relation between the temperature difference stress W and each preset temperature difference stress:
when W is less than W1, selecting the first preset warning message grade Y1 as a warning message grade Y;
when W1 is less than or equal to W2, selecting the second preset warning message grade Y2 as a warning message grade Y;
when W2 is less than or equal to W3, selecting the third preset warning message grade Y3 as a warning message grade Y;
and when W3 is less than or equal to W4, selecting the fourth preset warning message grade Y4 as the warning message grade Y.
2. The tie rod emergency alert system for a superconducting magnet according to claim 1, wherein the processing module is further configured to set a correction coefficient to correct the alert message level based on a relationship between a low temperature time and a preset low temperature time; setting low-temperature early warning based on the relation between the cold end temperature TL of the pull rod and a preset low temperature; and setting high-temperature early warning based on the relation between the temperature TN of the warm end of the pull rod and the preset high temperature.
3. The tie rod emergency pre-warning system for a superconducting magnet according to claim 2, wherein a preset low temperature time matrix T0 is preset, for which T0 (T1, T2, T3, T4) is set, wherein T1 is a first preset low temperature time, T2 is a second preset low temperature time, T3 is a third preset low temperature time, T4 is a fourth preset low temperature time, and T1 < T2 < T3 < T4;
presetting a preset correction coefficient matrix bi, and setting bi (b 1, b2, b3 and b 4) for the preset correction coefficient matrix bi, wherein b1 is a first preset correction coefficient, b2 is a second preset correction coefficient, b3 is a third preset correction coefficient, b4 is a fourth preset correction coefficient, and b1 is more than b2 and less than b3 and less than b4;
selecting an ith preset correction coefficient according to the relation between the low-temperature time T and each preset low-temperature time to correct the warning message grade Y, wherein i=1, 2,3 and 4;
when T is smaller than T1, the first preset correction coefficient b1 is selected to correct the warning message grade Y, and the corrected warning message grade is Y x b1;
when T1 is less than or equal to T2, selecting the second preset correction coefficient b2 to correct the warning message grade Y, wherein the corrected warning message grade is Y x b2;
when T2 is less than or equal to T3, selecting the third preset correction coefficient b3 to correct the warning message grade Y, wherein the corrected warning message grade is Y x b3;
when T3 is less than or equal to T4, the fourth preset correction coefficient b4 is selected to correct the warning message grade Y, and the corrected warning message grade is Y x b4.
4. The pull rod emergency pre-warning system for a superconducting magnet according to claim 1, wherein the information acquisition module comprises a tension acquisition device for acquiring tension applied to the pull rod; the temperature detection device is used for acquiring the cold end temperature TL of the pull rod and the warm end temperature TN of the pull rod; the pull rod stretching amount measuring device is used for obtaining the length L of the pull rod.
5. The tie rod emergency alert system for a superconducting magnet according to claim 1, wherein the tie rod is a titanium alloy material.
6. The tie rod emergency pre-warning system for a superconducting magnet according to claim 1, wherein the processing module is further configured to count a usage time t of the tie rod, and set a discard time of the tie rod based on a relationship between the usage time and a preset time.
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