CN113500920B - A superconducting magnetic suspension shock absorption system and control method thereof - Google Patents
A superconducting magnetic suspension shock absorption system and control method thereof Download PDFInfo
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- 230000035939 shock Effects 0.000 title claims description 15
- 238000010521 absorption reaction Methods 0.000 title claims description 4
- 238000013016 damping Methods 0.000 claims abstract description 149
- 239000002887 superconductor Substances 0.000 claims abstract description 28
- 230000006698 induction Effects 0.000 claims abstract description 7
- 238000005339 levitation Methods 0.000 claims description 63
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 24
- 239000007788 liquid Substances 0.000 claims description 18
- 238000005265 energy consumption Methods 0.000 claims description 13
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- IJJWOSAXNHWBPR-HUBLWGQQSA-N 5-[(3as,4s,6ar)-2-oxo-1,3,3a,4,6,6a-hexahydrothieno[3,4-d]imidazol-4-yl]-n-(6-hydrazinyl-6-oxohexyl)pentanamide Chemical compound N1C(=O)N[C@@H]2[C@H](CCCCC(=O)NCCCCCC(=O)NN)SC[C@@H]21 IJJWOSAXNHWBPR-HUBLWGQQSA-N 0.000 description 2
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L13/00—Electric propulsion for monorail vehicles, suspension vehicles or rack railways; Magnetic suspension or levitation for vehicles
- B60L13/04—Magnetic suspension or levitation for vehicles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/03—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using magnetic or electromagnetic means
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- Control Of Vehicles With Linear Motors And Vehicles That Are Magnetically Levitated (AREA)
Abstract
The invention provides a superconducting magnetic suspension damping system and a control method thereof, which relate to the technical field of superconducting magnetic suspension and comprise a permanent magnet track, a suspension dewar, a superconductor block and a shunt damping system, wherein the superconductor block is arranged in the suspension dewar and is repelled with the permanent magnet track to provide suspension force for a train under the temperature environment provided by the suspension dewar; and the shunt damping system is arranged in the suspension dewar, the shunt damping system is arranged on the inner wall of the suspension dewar, when the train runs, the shunt damping system generates an induction magnetic field which is repulsive to the magnetic field of the permanent magnet track, the vertical stable assembly is arranged in the suspension dewar, the magnetic field gradient generated in the vertical direction by the permanent magnet track is utilized through electromagnetic induction, the vertical vibration of the train is reduced, the dynamic stability of the train is improved, and the comfort of the train using the embodiment is improved.
Description
Technical Field
The invention relates to the technical field of superconducting magnetic suspension, in particular to a superconducting magnetic suspension damping system and a control method thereof.
Background
Along with development of superconducting technology, the high-temperature superconducting magnetic levitation technology mainly characterized by no friction, low energy consumption and low pollution has great potential for becoming a novel high-speed rail transportation mode. The suspension system is used as a core subsystem of the high-temperature superconducting magnetic suspension system, and the performance of the suspension system determines the performance of the whole vehicle. The aspect of improving dynamic characteristics is mainly aimed at trains at present. But mainly adopts a damping component, such as an air spring, to connect the suspension frame and the vehicle body, but the structure is complex and is not beneficial to practical implementation.
Disclosure of Invention
The invention aims to provide a superconducting magnetic suspension damping system and a control method thereof so as to solve the problems. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
On one hand, the application provides a superconducting magnetic suspension damping system which comprises a permanent magnet track, a suspension dewar, a superconductor block and a shunt damping system, wherein the superconductor block is arranged in the suspension dewar, the superconductor block is repelled with the permanent magnet track to provide suspension force for a train under the temperature environment provided by the suspension dewar, the shunt damping system is arranged in the suspension dewar, the shunt damping system is arranged on the inner wall of the suspension dewar, and when the train is in a vibration working condition, the shunt damping system generates an induction magnetic field which is repelled with the magnetic field of the permanent magnet track.
Further, the shunt damping system comprises at least one vertical stable assembly, each vertical stable assembly comprises a first damping body and a first energy dissipation resistor, the first energy dissipation resistor is electrically connected with the first damping body, the first damping body and the first energy dissipation resistor are located below the liquid level of liquid nitrogen, and when a train runs, the first damping body cuts a permanent magnet track to generate a magnetic field component in the vertical direction.
The shunt damping system further comprises a first switch, a second switch and a power supply, wherein the first damping body is a coil, the power supply is connected in series with the first switch and then connected in parallel with the first damping body, and the first energy consumption resistor is connected in series with the second switch and then connected in parallel with the first damping body.
Further, the permanent magnet track comprises at least one vertical permanent magnet with a magnetization direction being a vertical direction, and the first damping body is arranged right above the vertical permanent magnet.
Further, a first damping body is arranged right above each vertical permanent magnet.
Further, the end face, close to the permanent magnetic track, of the first damping body and the end face, close to the permanent magnetic track, of the superconductor block are located on the same horizontal height.
Further, the shunt damping system comprises at least one rolling vibration stabilizing component, each rolling vibration stabilizing component comprises a second damping body and a second energy dissipation resistor, the second energy dissipation resistors are electrically connected with the second damping bodies, the second damping bodies and the second energy dissipation resistors are located below the liquid level of liquid nitrogen, and the second damping bodies cut the permanent magnet tracks to generate magnetic field components in the horizontal direction.
On the other hand, the application also provides a control method of the superconducting magnetic suspension damping system, which comprises the following steps:
Acquiring the running speed, running state and train levitation height of a train in real time, wherein the running state comprises vibration or stability;
According to the running speed, calculating to obtain the current speed state of the train, wherein the speed state comprises constant-speed running or non-constant-speed running;
Calculating to obtain first information according to the speed state, the running speed and the train levitation height, wherein the first information comprises an opening and closing state of a first switch, an opening and closing state of a second switch and an opening and closing state of a third switch;
and sending a first control command, wherein the first control command comprises a command for opening and closing a switch in the superconducting magnetic suspension damping system according to the first information.
Further, the acquiring the running speed in real time includes:
Acquiring second information, wherein the second information comprises the rigidity of a suspension system, the magnetic field strength of the suspension system, the mass of a train, the inductance value of a first damping body, the number of turns of the first damping body, the single-turn length of the first damping body, the inductance value of a second damping body, the number of turns of the second damping body and the single-turn length of the second damping body;
calculating according to the second information to obtain third information, wherein the third information comprises the resistance value of the first energy dissipation resistor and the resistance value of the second energy dissipation resistor;
And sending a second control command, wherein the second control command comprises a command for changing the resistance value of the first energy dissipation resistor and the resistance value of the second energy dissipation resistor in the shunt damping system based on the third information.
Further, the calculating to obtain the first information according to the speed state, the running speed and the train levitation height includes:
if the train levitation height is less than a first threshold value, the first information comprises that a first switch is closed, a second switch is opened and a third switch is opened;
if the running speed is greater than a threshold value and the speed state is uniform running, the first information comprises that the first switch is opened, the second switch is opened and the third switch is closed;
if the driving state is vibration, the first information includes that the first switch is opened, the second switch is closed, and the third switch is opened.
The beneficial effects of the invention are as follows:
According to the application, the vertical stable component is arranged in the suspension Dewar to cut the magnetic field component generated by the permanent magnet track in the vertical direction, so that the vertical vibration of the train is reduced, the dynamic stability of the train is improved, the comfort of using the train in the embodiment is improved, and the electric generation magnetism is added into the vertical balance component to generate the magnetic field which is generated by the permanent magnet track and is repelled when the suspension force is insufficient, thereby providing suspension force compensation, reducing the suspension force due to the AC loss in the vehicle-mounted superconducting magnet and improving the safety performance of using the train.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the embodiments of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related 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 superconducting magnetic levitation shock absorbing system according to the present application;
Fig. 2 is a schematic structural diagram of the suspension dewar according to the present application:
fig. 3 is a schematic circuit connection diagram of the vertical smoothing assembly according to the present application.
The figure shows that 1, a permanent magnet track, 11, a vertical permanent magnet, 2, a suspended Dewar, 3, a superconductor block, 41, a first damping body, 42, a first energy consumption resistor, 43, a second damping body, 44, a first switch, 45, a second switch, 46, a power supply, 47, a third switch and 5, liquid nitrogen are marked.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
Along with the further development of the magnetic levitation technology, a high-temperature superconducting magnetic levitation technology integrating a plurality of advantages is well developed, and the high-temperature superconducting magnetic levitation technology is required to be explained, so that the research on the application of a high-temperature superconducting magnetic levitation train system is more and more abundant, however, the previous research shows that the damping of the levitation system is lower, and the large-amplitude nonlinear vibration is easy to occur under the external interference. With further development of research and establishment of medium-long distance test lines, the permanent magnet track 1 used in the superconducting magnetic suspension system also has the problem of track irregularity which can greatly influence the running stability of a train under the condition of movement, particularly under the high-speed running working condition, similar to the traditional track traffic of railways and the like. Meanwhile, the track irregularity directly causes uneven track surface magnetic field along the running direction, the magnetic levitation train running above the permanent magnet track 1 inevitably experiences irregular changing magnetic field, alternating current loss and even internal temperature rise phenomenon occur in the vehicle-mounted superconducting magnet, train levitation force is reduced, train levitation height is reduced, driving safety is affected, permanent magnet magnetization is uneven (theoretical error of magnetization +/-1%), surface stripping, joint gaps, misplacement and other assembly errors are caused, and the high-temperature superconducting magnetic levitation train running above the permanent magnet track 1 can experience high-frequency alternating magnetic field excitation when running at high speed. Thereby, the magnetic flux flow and the creeping are captured inside the superconductor block 3, the energy loss mainly comprising hysteresis loss and less eddy current loss is caused, the damping generated by hysteresis is brought, and the riding comfort requirement of the engineering application of the magnetic levitation vehicle cannot be met. Based on the above, the present application provides the following embodiments to achieve improvement of dynamic characteristics of a system for the case where levitation force of a levitation system is reduced and vibration is liable to occur.
As shown in fig. 1, a superconducting magnetic levitation shock absorbing system is provided in this embodiment.
Referring to fig. 1, this embodiment is shown to include a permanent magnet track 1, a levitation dewar 2, a superconductor block 3, and a shunt damping system. The permanent magnet track 1 adopted in the embodiment adopts a Ha l bach array structure, wherein the permanent magnet track 1 comprises at least one vertical permanent magnet 11 with a vertical magnetization direction, more magnetic fields can be gathered above the track, a larger magnetic field can be provided for the superconductor block 3, and meanwhile, a required magnetic field can be provided for a shunt damping system. The adopted superconductor block 3 is made of YBCO high-temperature superconducting material. Specifically, in this embodiment, the superconductor 3 is disposed in the levitation dewar 2, the superconductor 3 is repelled with the permanent magnetic track 1 under the temperature environment provided by the levitation dewar 2 to provide levitation force for the train, specifically, the superconductor 3 is disposed on the bottom wall of the levitation dewar 2, and the shunt damping system is disposed in the levitation dewar 2, and the shunt damping system is disposed on the inner wall of the levitation dewar 2, so that when the train is in vibration condition, the shunt damping system is disposed on the train and moves along with the movement of the train, when the train is in vibration condition, i.e. when the magnetic field is not in compliance, the shunt damping system cuts an uneven magnetic field, thereby changing the magnetic flux of the shunt damping system, so that the shunt damping system generates an induction magnetic field which blocks the magnetic field change of the permanent magnetic track 1, i.e. generates an induction magnetic field which repels the magnetic field of the permanent magnetic track 1, thereby reducing the damping caused by the magnetic field non-uniformity of the permanent magnetic track 1, and improving riding comfort.
Specifically, referring to FIG. 1, in the present embodiment, the split damping system includes at least one vertical trim assembly. It should be noted that, the specific number of the vertical stability assemblies is selected according to the actual situation, and the selected number is determined according to the width of the permanent magnet track 1 and the length of the train, so in this embodiment, no specific limitation is made on the number of the vertical stability assemblies. In this embodiment, each vertical stabilizing assembly comprises a first damping body 41 and a first energy dissipation resistor 42 (not shown in the figure), specifically, in this embodiment, the first damping body 41 is preferably a coil, specifically, preferably, is wound by enameled wires, has high conductivity, is tightly and flatly wound, and can better bear force in interaction with the permanent magnet track 1, in this embodiment, the first energy dissipation resistor 42 is electrically connected with the first damping body 41, the first damping body 41 and the first energy dissipation resistor 42 are both located below the liquid level of the liquid nitrogen 5, and when the train is in a vibration working condition, the first damping body 41 cuts the permanent magnet track 1 to generate a magnetic field component in the vertical direction.
By the technical scheme, a coil-first energy dissipation resistor 42 circuit is formed, and when a train suspended above the permanent magnet track 1 runs through a magnetic field change area of the permanent magnet track 1, the position of the train relative to the track is changed. Under the condition that the coil is also in a changed magnetic field and generates magneto electricity, the coil plays the role of a generator, when induced current is generated, the system only has the resistance of the coil, and the resistance is limited, so that the current cannot be effectively consumed, and the current always exists in a circuit, when the first energy consumption resistor 42 is externally connected, the electric energy generated by each movement can be effectively converted into heat energy by the first energy consumption resistor 42, the energy conversion efficiency is improved, so that the movement energy of the magnetic field is relieved in a macroscopic sense, the movement energy is efficiently converted, and the damping movement generated by hysteresis is quite light.
However, the above arrangement fails to solve the problem that the track irregularity will directly cause uneven magnetic field on the surface of the track along the running direction, the floating car running above the permanent magnet track 1 will inevitably experience irregular changing magnetic field, resulting in ac loss and internal temperature rise phenomenon inside the vehicle-mounted superconducting magnet, resulting in reduced levitation force of the train, and lowering the levitation height of the train, which affects the driving safety, so in this embodiment, referring to fig. 3, the shunt damping system further comprises a first switch 44, a second switch 45 and a power supply 46, the first damping body 41 is a coil, the power supply 46 is connected in series with the first switch 44 and then connected in parallel with the first damping body 41, and the first energy dissipation resistor 42 is connected in series with the second switch 45 and then connected in parallel with the first damping body 41.
Through the above arrangement, the first switch 44 and the second switch 45 can respectively control whether the first damping body 41 is connected with the first energy dissipation component or the power supply 46, when the coil is externally connected with the power supply 46, a magnetic field can be excited due to the magnetic effect of current, and the generated magnetic field is related to the number of turns of the induction coil, the size of the energizing current and the distance from the point to the coil. In this case, the relationship between the magnetic field and the action of the magnetic field can be obtained by generating the magnetism electrically in this embodiment. The electromagnetic force generated can act on the high-temperature superconducting magnetic suspension system to play a role in suspension force and improve the suspension performance of the system. Compared with the method for inhibiting the height reduction of the superconductor block 3 in the prior art, although the problem of rotor height reduction is effectively inhibited, the method can only slow down the trend of suspension force reduction, but the embodiment can selectively compensate suspension force or slow down train vibration according to the actual condition of a train, namely, different external circuits of coils are selected, the operation height of the train can be stabilized and comfort is ensured according to requirements, and the safety performance and comfort of the train using the embodiment are improved.
In the present embodiment, however, by introducing the coil into the superconducting magnetic levitation system, it is possible to make the superconducting magnetic levitation system exert a larger levitation performance, and to exert the maximum energy efficiency for lifting the magnetic field generated by the first damping body 41, in the present embodiment, the first damping body 41 is disposed directly above the vertical permanent magnet 11. The coil and the permanent magnet track 1 can have the greatest acting force through the arrangement. And in order to make full use of each vertical permanent magnet 11, in the present embodiment, one first damping body 41 is provided directly above each vertical permanent magnet 11. Through the arrangement, the magnetic field above the vertical permanent magnet 11 is larger by matching with the permanent magnet track 1 with the Ha l bach array structure, and the larger magnetic field above the vertical permanent magnet 11 in the vertical magnetization direction can interact with the magnetic field generated by the first damping body 41 to form larger repulsive force, so that the levitation force of the shunt damping system is maximally improved. Meanwhile, the electromagnetic force generated by the first damping body 41 is similar to the acting force of the superconductor block 3 and the permanent magnetic track 1, and belongs to non-contact force, and has a plurality of similarities in the action characteristics.
Further, in order to raise the magnetic field generated by the first damping body 41 to exert the maximum energy efficiency, in this embodiment, the end face of the first damping body 41 close to the permanent magnetic track 1 is located at the same level as the end face of the superconductor block 3 close to the permanent magnetic track 1, in other words, since the first damping body 41 and the superconductor block 3 are placed on the same plane, the working height of the superconductor block 3 is the same as the working height of the current-carrying coil, it is known from the biot-savart law that the magnitude of the magnetic induction B generated by the current element at a certain point in space is inversely proportional to the square of the distance from the current element to the point, and therefore, when the superconductor block 3 reaches the maximum levitation force, the repulsive force value generated by the first damping body 41 and the permanent magnetic track 1 will also reach the maximum value. In addition, the first damping body 41 and the superconductor block 3 are both in the liquid nitrogen 5 environment, and the resistance value of the first damping body 41 is smaller than that at room temperature, so that joule heat generated by the first damping body 41 is also smaller, and the consumption of the liquid nitrogen 5 caused by heat generated by the first damping body 41 is also reduced for the same current intensity. And because the first damping body 41 and the superconductor block 3 are at the same height, the first damping body 41 can be maximally close to the surface of the permanent magnetic track 1, the first damping body 41 and the superconductor block 3 are both in the liquid nitrogen 5 environment, the resistance of the first damping body 41 can be reduced more than that at normal temperature, and a thinner wire diameter can be adopted relative to that at normal temperature. Therefore, for the first damping body 41 with the same volume, the first damping body 41 in the liquid nitrogen 5 environment can have more turns, so that the greater magnetic field utilization efficiency is obtained, and the greater damping is generated.
With the above arrangement, both the suspension force compensation and the vibration reduction are realized by the first damper 41, so in the present embodiment, when two functions are realized, it is not necessary to redesign the position of the first damper 41 or move the position thereof, but only by the first switch 44 and the second switch 45 in the present embodiment. And since the first damping body 41 and the magnetic field realize common levitation force compensation and shock absorption, this also greatly simplifies the structural form of the present embodiment, reduces the complexity of the system and increases the operability in practical cases.
In summary, the coil is introduced into the superconducting magnetic suspension system, so that the system is not complicated, the magnetic field of the track is fully utilized, and meanwhile, the resistance of the coil is lower and the heat generation is smaller due to the liquid nitrogen 5 environment of the superconducting magnetic suspension system.
Due to the first damping body 41 provided as described above, the rolling phenomenon occurring in the train cannot be well handled. Since the first damping body 41 can only cut the magnetic field component perpendicular to the permanent magnet track 1 and cannot process the magnetic field component parallel to the permanent magnet track 1, the horizontal component force caused by the magnetic field cannot be reduced when the rolling vibration phenomenon occurs in the train. In view of the above problems, in the present embodiment, the number of the split damping system at least one rolling vibration stabilizing assembly, specifically, the number of the rolling vibration stabilizing assemblies is determined according to the installation position of the rolling vibration stabilizing assembly and the length of the train, referring to fig. 2, in the present embodiment, the rolling vibration stabilizing assemblies are disposed on the side wall of the levitation dewar 2, and at least two rolling vibration stabilizing assemblies are disposed on the side wall of the levitation dewar 2, respectively, in order to maximize the use of the components of the permanent magnet rail 1 in the horizontal direction, and each rolling vibration stabilizing assembly includes a second damping body 43 and a second energy consumption resistor (not shown in the drawing), the second damping body 43 and the second energy consumption resistor are electrically connected to the second damping body 43, and the second damping body 43 and the second energy consumption resistor are all located under the liquid surface of the liquid nitrogen 5, and the second damping body 43 cuts the permanent magnet rail 1 to generate the magnetic field component in the horizontal direction. With the above arrangement, the second damping body 43 cuts the permanent magnetic track 1 to generate a magnetic field component in the horizontal direction, and when the magnetic field of the permanent magnetic track 1 changes, the second damping body 43 will perform the same function as the first damping body 41, which is not described in detail in the present application.
In this embodiment, through set up the vertical steady subassembly in the suspension Dewar 2 and cut the magnetic field component that permanent magnetism track 1 produced in vertical direction, reduce the train and shake in vertical, through set up the magnetic field component that the steady subassembly of rolling vibration cut permanent magnetism track 1 produced in the horizontal direction, reduce the train and shake in the level, thereby reach the purpose of firm train, promote the travelling comfort of using this embodiment train, through adding power 46 at vertical balance subassembly, through the electricity magnetism, produce the magnetic field that permanent magnetism track 1 repulses, thereby provide the levitation force compensation and because the inside alternating current loss that appears of on-vehicle superconducting magnet leads to the levitation force that reduces, promote the security performance of using this embodiment train.
Example 2:
in this embodiment, a method of using the superconducting magnetic levitation shock absorbing system of embodiment 1 is provided, and the superconducting magnetic levitation shock absorbing system of embodiment 1 is used.
Also, in the present embodiment, the vertical smoothing assembly further includes a third switch 47 and a load, specifically, in the present embodiment, the load refers to electric equipment including, but not limited to, a battery, an air conditioner, a lighting system, an air purifying system, and the like.
Specifically, in the present embodiment, step S100, step S200, step S300, step S400, step S500, step S600, and step S700 are included.
S100, acquiring second information, wherein the second information comprises suspension system rigidity, suspension system magnetic field strength, train quality, an inductance value of the first damping body 41, the number of turns of the first damping body 41, a single-turn length of the first damping body 41, an inductance value of the second damping body 43, the number of turns of the second damping body 43 and a single-turn length of the second damping body 43;
s200, calculating according to the second information to obtain third information, wherein the third information comprises the resistance value of the first energy dissipation resistor 42 and the resistance value of the second energy dissipation resistor;
Since the first damping body 41 and the first energy dissipation resistor 42 form a circuit and the second damping body 43 and the second energy dissipation resistor form a circuit, when the mass of the train is constant, the resistance of the circuit directly determines the damping effect of the system. The resistance value is too small, the electric energy cannot be effectively consumed, the damping effect is not obvious, the resistance value is too large, the circuit is equivalent to an open circuit state, and damping cannot be carried out. Therefore, it is particularly important to determine the resistance values of the first dissipative resistor 42 and the second dissipative resistor.
Wherein, the optimal resistance values of the first energy dissipation resistor 42 and the second energy dissipation resistor are calculated by the following formula:
Wherein R opt is an optimal resistance value, k is the rigidity of the magnetic suspension system, L is an inductance value, m is the mass of the train, and phi is the magnetic flux.
Wherein phi is related to the number of turns of the coil, the magnetic field strength of the permanent magnet track 1 and the length of a single turn of the coil, and the calculation formula is the prior art, and the application is not repeated.
S300, a second control command is sent, wherein the second control command comprises a command for changing the resistance value of the first energy dissipation resistor 42 and the resistance value of the second energy dissipation resistor in the shunt damping system based on third information.
S400, acquiring the running speed, running state and train levitation height of the train in real time, wherein the running state comprises vibration or stability;
It should be noted that, for those skilled in the art, the levitation height of the train obtained in this step may alternatively be the distance from the bottom of the train to the track, and the main purpose of this is to determine whether the height of the train is lowered.
S500, calculating to obtain the current speed state of the train according to the running speed, wherein the speed state comprises uniform running or non-uniform running;
s600, calculating to obtain first information according to the speed state, the running speed and the train levitation height, wherein the first information comprises an opening and closing state of the first switch 44, an opening and closing state of the second switch 45 and an opening and closing state of the third switch 47;
specifically, steps S610, S620, and S630 are also included in step S600.
S610, if the train levitation height is less than the first threshold value, the first information includes that the first switch 44 is closed, the second switch 45 is opened and the third switch 47 is opened.
It should be noted that, through the above logic judgment, when the levitation height of the train is lower than the threshold value, the superconductor of the train may overheat itself, the levitation force has already started to have a tendency of decreasing, if the train continues to run, the safety of the whole train cannot be ensured, so when the levitation height of the train is lower than the first threshold value, the levitation force compensation function of the shunt damping system can be started, so as to reduce the possibility of danger of the train. In this embodiment, the first threshold is 10mm.
S620, if the train levitation height is greater than the first threshold value and the speed is greater than the second threshold value and the driving state is uniform, the first information comprises that the first switch 44 is opened, the second switch 45 is opened and the third switch 47 is closed;
it should be noted that, when the train is running, that is, the second threshold value is 450km/h, the first damping body 41 will cut the magnetic field component in the vertical direction, along with the increase of the running speed of the train, the current frequency generated by exciting the first damping body 41 will be increased by the uneven magnetic field generated by the permanent magnetic track 1, and along with the increase of the frequency of the exciting current, the maximum value of the induced current generated by the electromagnetic coil increases first and then gradually becomes stable, and the value of the induced current intensity is considerable, so in the embodiment, by changing the current input area generated by the first damping body 41, the current is not consumed by the first energy consumption resistor 42 any more, and is provided for the load, so that the energy can be effectively recovered by using the unsmooth magnetic field, and the energy conversion efficiency is improved.
S620, if the driving state is vibration, the first information includes that the first switch 44 is opened, the second switch 45 is closed, and the third switch 47 is opened;
It will be appreciated that the damping is performed by the first energy dissipation resistor 42 and the second energy dissipation resistor in this step, i.e. when the train is traveling at a non-uniform speed. In actual operation, during non-uniform traveling, the electromagnetic excitation of the magnetic field to the first damping body 41 is unstable, and the current is unstable, so that if the load is connected again, the resistance value is too large, the circuit is equivalent to an open circuit state, and vibration reduction cannot be performed.
S700, a first control command is sent, wherein the first control command comprises a command for opening and closing a switch in the superconducting magnetic suspension damping system according to first information.
In summary, in this embodiment, by using the magnetic levitation shock absorbing system of embodiment 1, shock absorption, levitation force compensation and energy recovery of the magnetic levitation train can be effectively realized. The dynamic stability is improved, and meanwhile, the safety performance of the train is improved.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
The foregoing is merely illustrative embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present invention, and the invention should be covered. Therefore, the protection scope of the invention is subject to the protection scope of the claims.
Claims (7)
1.A control method of a superconducting magnetic levitation shock absorbing system, comprising:
Acquiring the running speed, running state and train levitation height of a train in real time, wherein the running state comprises vibration or stability;
According to the running speed, calculating to obtain the current speed state of the train, wherein the speed state comprises constant-speed running or non-constant-speed running;
calculating first information according to the speed state, the running speed and the train levitation height, wherein the first information comprises an opening and closing state of a first switch (44), an opening and closing state of a second switch (45) and an opening and closing state of a third switch (47);
a first control command is sent, wherein the first control command comprises a command for opening and closing a switch in the superconducting magnetic suspension damping system according to the first information;
The superconductive magnetic suspension damping system comprises a permanent magnet track (1), a suspension dewar (2), a superconductor block (3), a shunt damping system and a shunt damping system, wherein the superconductor block (3) is arranged in the suspension dewar (2), the superconductor block (3) is in repulsion with the permanent magnet track (1) to provide suspension force for a train under the temperature environment provided by the suspension dewar (2), the shunt damping system is arranged in the suspension dewar (2), the shunt damping system is arranged on the inner wall of the suspension dewar (2), when the train is in a vibration working condition, generates an induction magnetic field which is in repulsion with the magnetic field of the permanent magnet track (1), the shunt damping system comprises at least one vertical stable component, each vertical stable component comprises a first damping body (41) and a first energy consumption resistor (42), the first energy consumption resistor (42) is electrically connected with the first damping body (41), the first damping body (41) and the first energy consumption resistor (42) are positioned below a liquid nitrogen liquid level (5), when the train is in a vibration working condition, the shunt damping system (45) further comprises a first damping component (46) and a second damping component (45) which is arranged on the cutting power supply (45), the first damping body (41) is a coil; the power supply (46) is connected in series with the first switch (44) and then connected in parallel with the first damping body (41), the first energy consumption resistor (42) is connected in series with the second switch (45) and then connected in parallel with the first damping body (41), and the vertical stable assembly further comprises a third switch (47) and a load, wherein the third switch (47) is connected in series with the load and then connected in parallel with the first damping body (41).
2. The control method of the superconducting magnetic levitation shock absorbing system according to claim 1, wherein acquiring the traveling speed of the train in real time previously comprises:
Acquiring second information, wherein the second information comprises suspension system rigidity, suspension system magnetic field strength, train quality, an inductance value of a first damping body (41), a number of turns of the first damping body (41), a single-turn length of the first damping body (41), an inductance value of a second damping body (43), a number of turns of the second damping body (43) and a single-turn length of the second damping body (43);
Calculating according to the second information to obtain third information, wherein the third information comprises a resistance value of the first energy dissipation resistor (42) and a resistance value of the second energy dissipation resistor;
a second control command is sent, the second control command comprising a command to change a resistance value of the first dissipative resistor (42) and a resistance value of the second dissipative resistor in the shunt damping system based on the third information.
3. The method for controlling a superconducting magnetic levitation shock system according to claim 1, wherein the calculating first information according to the speed state, the traveling speed, and the levitation height of the train comprises:
if the train levitation height is less than a first threshold value, the first information comprises that a first switch (44) is closed, a second switch (45) is opened and a third switch (47) is opened;
if the travel speed is greater than a threshold and the speed state is uniform, the first information includes that the first switch (44) is open, that the second switch (45) is open, and that the third switch (47) is closed;
if the driving state is vibration, the first information includes that the first switch (44) is opened, that the second switch (45) is closed, and that the third switch (47) is opened.
4. The method for controlling a superconducting magnetic levitation shock absorbing system according to claim 1, wherein the permanent magnet track (1) comprises at least one vertical permanent magnet (11) with a magnetization direction being a vertical direction, and the first damping body (41) is disposed right above the vertical permanent magnet (11).
5. A control method of a superconducting magnetic levitation shock absorbing system according to claim 4, wherein a first damping body (41) is arranged right above each vertical permanent magnet (11).
6. The method for controlling a superconducting magnetic levitation shock absorbing system according to claim 1, wherein the end surface of the first damping body (41) close to the permanent magnet track (1) and the end surface of the superconductor block (3) close to the permanent magnet track (1) are located on the same horizontal level.
7. The method for controlling a superconducting magnetic levitation shock absorption system according to claim 1, wherein the shunt damping system comprises at least one rolling vibration stabilizing assembly, each rolling vibration stabilizing assembly comprises a second damping body (43) and a second energy dissipation resistor, the second energy dissipation resistors are electrically connected with the second damping bodies (43), the second damping bodies (43) and the second energy dissipation resistors are located below the liquid level of liquid nitrogen (5), and the second damping bodies (43) cut a permanent magnetic track (1) to generate a magnetic field component in the horizontal direction.
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