Dynamic performance testing device and measuring method for permanent magnet track of high-temperature superconducting magnetic levitation system
By designing a test device for high-temperature superconducting magnetolev system, using vibration tables and sensors to simulate external excitation, the problem of difficult to test the dynamic response and drift of the low-temperature Dewar in the prior art is solved, and the low-temperature Dewar is achieved in different directions Accurate measurement and analysis of dynamic responses.
Patent Information
- Application Number
- CN202411257357.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-09
- Publication Date
- 2025-01-17
AI Technical Summary
During operation, the high-temperature superconducting magnetolev system causes vehicle vibration due to irregular magnetic field and load imbalance of permanent magnet tracks. It is difficult for the existing technology to effectively test the dynamic response and drift of low-temperature Dewar under different external excitations.
A test device including linear bearing slide module, external excitation module, mobile platform module and suspension module was designed. The external excitation was simulated by the excitation platform, and the dynamics of low-temperature Dewar were measured using acceleration sensors and laser displacement sensors. Characteristic parameters and drift phenomena realize the test of dynamic response of low-temperature Dewar in horizontal and vertical directions.
Through the combination of linear bearing slide module and mobile platform module of 'H' type structure, mechanical dynamic stability and testing accuracy are improved, and the dynamic response and drift of low-temperature Dewar can be accurately measured in horizontal and vertical directions. Effectively analyze the frequency response characteristics and damping effects under external excitation.
Smart Images
Figure CN119321878A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of high-temperature superconducting maglev technology, and in particular to a dynamic performance testing device and a measuring method for a permanent magnet track of a high-temperature superconducting maglev system. Background Art
[0002] High temperature superconducting (HTS) materials have great commercial value and have received much attention in engineering applications around the world. Due to the magnetic flux pinning effect, the HTS magnetic levitation system can maintain self-stabilizing suspension without any control or power supply system. During operation, the vehicle vibration is inevitably caused by the irregular magnetic field on the surface of the permanent magnet track (PMG) and the imbalance of the load.
[0003] In order to study the dynamic response and drift phenomenon of the low-temperature dewar when subjected to external excitation on different PMGs, the present invention provides a dynamic performance testing device and a measuring method for the permanent magnet track of a high-temperature superconducting maglev system. Based on an external excitation platform, the low-temperature dewar and the permanent magnet track are enabled to achieve relative motion, thereby indirectly simulating the dynamic response of the low-temperature dewar when subjected to different external excitations. Summary of the invention
[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a dynamic performance testing device and a measuring method for a permanent magnet track of a high-temperature superconducting maglev system, which can effectively test the dynamic response of a low-temperature dewar in the horizontal and vertical directions when subjected to different external excitations.
[0005] To achieve the above object, the present invention adopts the following technical solutions: High-temperature superconducting maglev system permanent magnet track dynamic performance test device, including linear bearing slider module, external excitation module, mobile platform module and suspension module; The linear bearing slider module comprises a horizontal linear bearing slider module and a vertical linear bearing slider module which are connected to each other to form an H-shaped structure, and two ends of the horizontal optical axis track in the horizontal linear bearing slider module are respectively fixed with vertical direction sliders through optical axis adapters, and the two vertical direction sliders are respectively slidably connected to the corresponding vertical optical axis tracks in the vertical linear bearing slider module; The external excitation module includes an excitation platform, a track base and a permanent magnet track, and the permanent magnet track and the track base are fixed on the excitation platform in sequence from top to bottom; The suspension module includes a low-temperature dewar, a high-temperature superconducting material, an acceleration sensor and a load platform. The high-temperature superconducting material is located inside the low-temperature dewar, the load platform is connected to the top of the low-temperature dewar, and the acceleration sensor is located above the low-temperature dewar and connected to the load platform; the low-temperature dewar is located directly above the permanent magnet track, and the low-temperature dewar is slidably connected to the horizontal optical axis track through a horizontal slider; The mobile platform module is connected to a sensor connector via a fixing plate, a laser displacement sensor is fixed to the sensor connector, and the mobile platform module can drive the laser displacement sensor to move and position in the horizontal and vertical directions; When the cryogenic dewar is in a free suspension state, the mobile platform module pulls the cryogenic dewar through a thin wire. After the cryogenic dewar is stable, the thin wire is cut to perform a free vibration experiment. The permanent magnet track is controlled by the excitation table to vibrate horizontally or vertically, so that the cryogenic dewar undergoes a forced vibration experiment, indirectly simulating the dynamic response of the cryogenic dewar when it is affected by external excitation. The dynamic characteristic parameters of the cryogenic dewar and the drift phenomenon of the cryogenic dewar are measured by acceleration sensors and laser displacement sensors.
[0006] Furthermore, the permanent magnet track is fixed on the track base through a track fixing plate, and the track base is fixed on the excitation table through an epoxy resin plate.
[0007] Furthermore, the horizontal optical axis track is provided with a horizontal constraint member for limiting horizontal displacement, and the vertical optical axis track is provided with a vertical constraint member for limiting vertical displacement.
[0008] Furthermore, the mobile platform module is composed of a horizontal screw nut module and a vertical screw nut module, and the horizontal screw nut module and the vertical screw nut module are respectively driven by corresponding stepping motors.
[0009] Furthermore, the acceleration sensor is connected to the load platform via a sensor connecting plate, and the sensor connecting plate is made of low-temperature resistant heat-insulating material.
[0010] Furthermore, the permanent magnet track is formed by arranging permanent magnets in a Halbach array structure in the transverse direction.
[0011] The test method of the high-temperature superconducting maglev system permanent magnet track dynamic performance test device of the present invention comprises the following steps: S1: The high-temperature superconducting material is arranged at the bottom of the low-temperature Dewar according to a preset arrangement, and is locked by a pressure plate so that the permanent magnet track is directly opposite to the low-temperature Dewar; S2: Fix the vertical height of the cryogenic Dewar according to the preset field cooling height through the lifting platform; S3: Inject liquid nitrogen into the low-temperature Dewar to ensure that the high-temperature superconducting material is completely immersed in the liquid nitrogen and perform field cooling on the high-temperature superconducting material; S4: Wait until the high-temperature superconducting material completely enters the superconducting state, remove the lifting platform, make the low-temperature Dewar in a free suspension state, and wait for five minutes for relaxation; S5: Use horizontal restraints or vertical restraints to restrain the cryogenic dewar in the horizontal direction or vertical direction, start the mobile platform module, pull the cryogenic dewar through a thin wire, and raise the cryogenic dewar by a certain distance; S6: After the cryogenic dewar is stable, the thin wire is cut to excite the cryogenic dewar, and the dynamic characteristic parameters of the cryogenic dewar are measured using an acceleration sensor, wherein the dynamic characteristic parameters include frequency response characteristics, damping and dynamic stiffness, etc.; S7: Repeat steps S1 to S4 S8: Start the mobile platform module and align the laser displacement sensor with the center of the cryogenic dewar; S9: Turn on the vibration table, select vertical or horizontal vibration, half or full wave waveform, frequency range of 0~600Hz, vibration time of 0~100min, and use laser displacement sensor to measure the frequency response characteristics of the low temperature Dewar under the influence of external excitation and the drift phenomenon of the low temperature Dewar; S10: After the experiment is completed, the collected data is saved.
[0012] By adopting the above technical solution, the present invention has the following beneficial effects: 1. The linear bearing slider module with "H" structure has higher mechanical and dynamic stability, which enables the cryogenic dewar to move in the horizontal and vertical directions at the same time. The constraints applied to the optical axis guide rail can make the cryogenic dewar move in only one direction; the friction coefficient between the components of the linear bearing slider module is small, which effectively ensures the test accuracy; 2. The cryogenic dewar is pulled by the mobile platform module, and then the pulling thin wire is cut to make the cryogenic dewar perform a free vibration experiment, and the dynamic response characteristics of the system can be observed. The permanent magnet track is controlled by the excitation table to vibrate horizontally and vertically, so that the cryogenic dewar moves on the vertical linear bearing slider module and the horizontal linear bearing slider module, simulating the forced vibration of the cryogenic dewar, and the drift of the system caused by external excitation can be observed. In addition, by placing the acceleration sensor on the load platform on the top of the cryogenic dewar, the damping effect of the cryogenic dewar in the two-axis direction when it is stimulated by the outside world can be analyzed. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments: Figure 1 is a horizontal schematic diagram of the measuring device of the present invention; Figure 2 It is a forward schematic diagram of the measuring device of the present invention; Figure 3 It is a top view schematic diagram of the suspension module when it vibrates; Figure 4 It is a forward schematic diagram of the measuring device of the present invention when vibrating. DETAILED DESCRIPTION
[0014] Example 1: Figure 1-4 As shown, the dynamic performance testing device of the permanent magnet track of the high-temperature superconducting magnetic levitation system of the present invention includes a linear bearing slider module 1, an external excitation module 2, a mobile platform module 3 and a suspension module 4.
[0015] The linear bearing slider module 1 includes a horizontal linear bearing slider module and a vertical linear bearing slider module connected to each other to form an H-shaped structure. The two ends of the horizontal optical axis track 101 in the horizontal linear bearing slider module are respectively fixed with vertical direction sliders 103 through the optical axis adapter 102. The two vertical direction sliders 103 are respectively slidably connected to the corresponding vertical optical axis tracks 104 in the vertical linear bearing slider module; wherein the optical axis adapter 102 is a part connecting the horizontal and vertical directions in the linear bearing slider module 11, so that the linear bearing slider module 1 forms an "H"-shaped structure. The linear bearing slider module 1 is fixed on the bracket 108 as a whole through the optical axis guide rail support 107.
[0016] The external excitation module 2 includes an excitation table 204 (electromagnetic), a track base 203 and a permanent magnet track 201. The permanent magnet track 201 and the track base 203 are fixed on the excitation table 204 in sequence from top to bottom, wherein the permanent magnet track 201 is fixed on the track base 203 through a track fixing plate 202, and the track base 203 is fixed on the excitation table 204 through an epoxy resin plate.
[0017] The suspension module 4 includes a low-temperature dewar 403, a high-temperature superconducting material 404, an acceleration sensor 401 and a load platform 402. The high-temperature superconducting material 404 is located inside the low-temperature dewar 403, the load platform 402 is connected to the top of the low-temperature dewar 403, and the acceleration sensor 401 is located above the low-temperature dewar 403 and connected to the load platform 402; the low-temperature dewar 403 is located directly above the permanent magnet track 201, and the low-temperature dewar 403 is slidably connected to the horizontal optical axis track 101 through a horizontal slider 109; The mobile platform module 3 is connected to a sensor connector 302 via a fixing plate 301, and a laser displacement sensor 303 is fixed to the sensor connector 302. The mobile platform module 3 can drive the laser displacement sensor 303 to move and position in the horizontal and vertical directions. When the cryogenic dewar 403 is in a free suspension state, the mobile platform module 3 pulls the cryogenic dewar 403 through a thin wire, and after the cryogenic dewar 403 is stable, the thin wire is cut to perform a free vibration experiment. The permanent magnet track 201 is controlled by the excitation table 204 to vibrate horizontally or vertically, so that the cryogenic dewar 403 performs a forced vibration experiment, which indirectly simulates the dynamic response of the cryogenic dewar 403 when it is affected by external excitation, and measures the dynamic characteristic parameters of the cryogenic dewar 403 and the drift phenomenon of the cryogenic dewar 403 through the acceleration sensor 401 and the laser displacement sensor 303.
[0018] A horizontal constraint 105 for limiting horizontal displacement is disposed on the horizontal optical axis track 101 , and a vertical constraint 106 for limiting vertical displacement is disposed on the vertical optical axis track 104 .
[0019] The mobile platform module 3 is composed of a horizontal screw nut module and a vertical screw nut module, and the horizontal screw nut module and the vertical screw nut module are driven by corresponding stepper motors respectively. The mobile platform module 3 uses two pairs of vertically cross-connected screw nut pairs, which is a conventional technology, and the specific structure and principle are not repeated here.
[0020] The acceleration sensor 401 is connected to the load platform 402 via a sensor connection plate. The sensor connection plate is made of low-temperature resistant heat-insulating material to prevent the acceleration sensor 401 from being affected by low temperature during long-term testing, thereby effectively ensuring the test accuracy.
[0021] The permanent magnet track 201 is formed by arranging permanent magnets in a Halbach array structure in the transverse direction.
[0022] The horizontal direction mentioned in the present invention refers to the X-axis direction in the drawings, and the vertical direction refers to the Z-axis direction in the drawings.
[0023] Embodiment 2: A test method using the dynamic performance test device of the permanent magnet track of a high-temperature superconducting maglev system of the present invention, the test method comprising the following steps: S1: The high temperature superconducting material 404 is arranged at the bottom of the low temperature Dewar 403 according to a preset arrangement, and is locked by a pressing plate so that the permanent magnet track 201 is directly opposite to the low temperature Dewar 403; S2: Fix the vertical height of the low temperature Dewar 403 according to the preset field cooling height through the lifting platform; S3: injecting liquid nitrogen into the low-temperature Dewar 403 to ensure that the high-temperature superconducting material 404 is completely immersed in the liquid nitrogen, and performing field cooling on the high-temperature superconducting material 404; S4: Wait until the high-temperature superconducting material 404 completely enters the superconducting state, remove the lifting platform, and make the low-temperature Dewar 403 in a free suspension state, and wait for five minutes for relaxation; S5: Use the horizontal restraint 105 or the vertical restraint 106 to restrain the low temperature dewar 403 in the horizontal direction or vertical direction, start the mobile platform module 3, pull the low temperature dewar 403 by the thin wire, and raise the low temperature dewar 403 by a certain distance; S6: After the cryogenic dewar 403 is stable, the thin wire is cut off to excite the cryogenic dewar 403, and the dynamic characteristic parameters of the cryogenic dewar 403 are measured by using the acceleration sensor 401, wherein the dynamic characteristic parameters include frequency response characteristics, damping and dynamic stiffness, etc.; S7: Repeat steps S1 to S4 S8: Start the mobile platform module 3 and align the laser displacement sensor 303 with the center of the cryogenic dewar 403; S9: Turn on the vibration table 204, select vertical or horizontal vibration, the waveform is half or full wave, the frequency is 0-600 Hz, the vibration time is 0-100 min, and the laser displacement sensor 303 is used to measure the frequency response characteristics of the low temperature dewar 403 under the influence of external excitation and the drift phenomenon of the low temperature dewar 403; S10: After the experiment is completed, the collected data is saved.
[0024] Example 3: Figure 3-Figure 4 As shown, the permanent magnet track 201 is fixed on the excitation table 204 through the permanent magnet track 201 base 203. By adjusting the parameters of the electromagnetic excitation table 204, the vibration direction is selected, the waveform is half or full wave, the frequency is 0~600Hz, and the vibration time is 0~100min. The vibration of the excitation table 204 drives the permanent magnet track 201 to vibrate to simulate the relative movement of the low-temperature dewar 403 when it is stimulated by the outside world. Due to the pinning effect of the high-temperature superconducting material 404 in the low-temperature dewar 403, the low-temperature dewar 403 begins to produce different degrees of movement, and the linear bearing slider module 1 is used to realize the movement of the model in the X-axis and Z-axis.
[0025] The above describes a specific embodiment of the present invention, but those skilled in the art should understand that this is only an example. Those skilled in the art can make various changes or modifications to this embodiment without departing from the principle and essence of the present invention, but these changes and modifications will fall within the scope of protection of the present invention.
Claims
1. High-temperature superconducting maglev system permanent magnet track dynamic performance test device, characterized by: It includes linear bearing slider module, external excitation module, mobile platform module and suspension module; The linear bearing slider module comprises a horizontal linear bearing slider module and a vertical linear bearing slider module which are connected to each other to form an H-shaped structure, and two ends of the horizontal optical axis track in the horizontal linear bearing slider module are respectively fixed with vertical direction sliders through optical axis adapters, and the two vertical direction sliders are respectively slidably connected to the corresponding vertical optical axis tracks in the vertical linear bearing slider module; The external excitation module includes an excitation platform, a track base and a permanent magnet track, and the permanent magnet track and the track base are fixed on the excitation platform in sequence from top to bottom; The suspension module includes a low-temperature dewar, a high-temperature superconducting material, an acceleration sensor and a load platform. The high-temperature superconducting material is located inside the low-temperature dewar, the load platform is connected to the top of the low-temperature dewar, and the acceleration sensor is located above the low-temperature dewar and connected to the load platform; the low-temperature dewar is located directly above the permanent magnet track, and the low-temperature dewar is slidably connected to the horizontal optical axis track through a horizontal slider; The mobile platform module is connected to a sensor connector via a fixing plate, a laser displacement sensor is fixed to the sensor connector, and the mobile platform module can drive the laser displacement sensor to move and position in the horizontal and vertical directions; When the cryogenic dewar is in a free suspension state, the mobile platform module pulls the cryogenic dewar through a thin wire. After the cryogenic dewar is stable, the thin wire is cut to perform a free vibration experiment. The permanent magnet track is controlled by the excitation table to vibrate horizontally or vertically, so that the cryogenic dewar undergoes a forced vibration experiment, indirectly simulating the dynamic response of the cryogenic dewar when it is affected by external excitation. The dynamic characteristic parameters of the cryogenic dewar and the drift phenomenon of the cryogenic dewar are measured by acceleration sensors and laser displacement sensors.
2. The dynamic performance test device for permanent magnet track of high temperature superconducting maglev system according to claim 1 is characterized in that: The permanent magnet track is fixed on the track base through a track fixing plate, and the track base is fixed on the excitation platform through an epoxy resin plate.
3. The dynamic performance test device for permanent magnet track of high temperature superconducting maglev system according to claim 1 is characterized in that: The horizontal optical axis track is provided with a horizontal constraint member for limiting horizontal displacement, and the vertical optical axis track is provided with a vertical constraint member for limiting vertical displacement.
4. The dynamic performance test device for permanent magnet track of high temperature superconducting maglev system according to claim 1, characterized in that: The mobile platform module consists of a horizontal screw nut module and a vertical screw nut module, and the horizontal screw nut module and the vertical screw nut module are driven by corresponding stepping motors respectively.
5. The dynamic performance test device for permanent magnet track of high temperature superconducting maglev system according to claim 1, characterized in that: The acceleration sensor is connected to the load platform via a sensor connecting plate, and the sensor connecting plate is made of low-temperature resistant heat-insulating material.
6. The dynamic performance test device for permanent magnet track of high temperature superconducting maglev system according to claim 1, characterized in that: The permanent magnet track is formed by arranging permanent magnets in a Halbach array structure in the transverse direction.
7. The method for testing the dynamic performance test device of the permanent magnet track of a high temperature superconducting maglev system according to any one of claims 1 to 6, characterized in that: The test method comprises the following steps: S1: The high-temperature superconducting material is arranged at the bottom of the low-temperature Dewar according to a preset arrangement, and is locked by a pressure plate so that the permanent magnet track is directly opposite to the low-temperature Dewar; S2: Fix the vertical height of the cryogenic Dewar according to the preset field cooling height through the lifting platform; S3: Inject liquid nitrogen into the low-temperature Dewar to ensure that the high-temperature superconducting material is completely immersed in the liquid nitrogen and perform field cooling on the high-temperature superconducting material; S4: Wait until the high-temperature superconducting material completely enters the superconducting state, remove the lifting platform, make the low-temperature Dewar in a free suspension state, and wait for five minutes for relaxation; S5: Use horizontal restraints or vertical restraints to restrain the cryogenic dewar in the horizontal direction or vertical direction, start the mobile platform module, pull the cryogenic dewar through a thin wire, and raise the cryogenic dewar by a certain distance; S6: After the cryogenic dewar is stable, the thin wire is cut off to excite the cryogenic dewar, and the dynamic characteristic parameters of the cryogenic dewar are measured using an acceleration sensor, wherein the dynamic characteristic parameters include frequency response characteristics, damping and dynamic stiffness; S7: Repeat steps S1 to S4 S8: Start the mobile platform module and align the laser displacement sensor with the center of the cryogenic dewar; S9: Turn on the vibration table, select vertical or horizontal vibration, half or full wave waveform, frequency range of 0~600Hz, vibration time of 0~100min, and use laser displacement sensor to measure the frequency response characteristics of the low temperature Dewar under the influence of external excitation and the drift phenomenon of the low temperature Dewar; S10: After the experiment is completed, the collected data is saved.