Eddy current brake plate design method and device, computer equipment and storage medium

Abstract

The invention provides an eddy current brake plate design method and device, computer equipment and a storage medium, and the method comprises the steps that a brake acceleration index is determined based on the brake requirement of a magnetic suspension propulsion system, and the brake requirement comprises the operation speed and the brake time; calculating a target braking force corresponding to the braking acceleration index; braking force curves under different plate widths are simulated through electromagnetic simulation software, and the braking force curves are curves of braking force changing along with speed; selecting an optimal braking force curve from the braking force curves according to the target braking force; and the eddy current brake plate is designed based on the plate width corresponding to the optimal brake force curve. In the technical scheme provided by the invention, by simulating the braking force curves under different plate widths, the braking characteristics under different plate widths can be quickly and accurately known, so that the eddy current braking plate meeting the braking requirement is quickly designed, and the braking performance is improved.

Description

Technical Field

[0001] This invention relates to the field of magnetic levitation technology, specifically to a design method, device, computer equipment, and storage medium for an eddy current brake plate. Background Technology

[0002] Ultra-high-speed superconducting electric levitation systems possess characteristics such as high thrust, low loss, high power density, and high power factor, making them suitable for a wide range of applications in ultra-high-speed maglev transportation systems and aerospace electromagnetic launch systems. Meanwhile, the design of eddy current brake plates requires stricter control. Insufficient plate width may result in insufficient braking force, failing to meet the vehicle's braking requirements; excessive plate width significantly increases costs without significantly improving braking performance, making precise plate width design impossible and leading to poor braking performance. Summary of the Invention

[0003] In view of the above problems, embodiments of the present invention provide a method, apparatus, computer device and storage medium for designing eddy current brake plates, in order to solve the problem that the prior art cannot achieve precise design of the plate width, resulting in poor braking performance.

[0004] In a first aspect, embodiments of the present invention provide a method for designing an eddy current brake plate, the method comprising:

[0005] Based on the braking requirements of the magnetic levitation propulsion system, a braking acceleration index is determined, which includes operating speed and braking time.

[0006] Calculate the target braking force corresponding to the braking acceleration index;

[0007] Using electromagnetic simulation software, the braking force curves under different plate widths are simulated. The braking force curve is the curve of braking force changing with speed.

[0008] Based on the target braking force, the optimal braking force curve is selected from the braking force curve;

[0009] The eddy current brake plate is designed based on the plate width corresponding to the optimal braking force curve.

[0010] In one possible implementation, selecting the optimal braking force curve from the braking force curve based on the target braking force includes:

[0011] Based on the braking force curve, the corresponding braking force can be retrieved according to the vehicle's operating speed.

[0012] The braking force curve corresponding to the braking force that is less than the target braking force and is closest to the target braking force is taken as the optimal braking force curve.

[0013] In one possible implementation, the eddy current braking plate includes a trapezoidal plate and multiple rectangular plates; the trapezoidal plate and the multiple rectangular plates are located on the same central axis; multiple rectangular plates are sequentially connected to the side with the maximum width of the trapezoidal plate, and the width of the multiple rectangular plates increases sequentially.

[0014] In one possible implementation, as the plate width increases, the effective interaction area between the vehicle's magnetic field and the eddy current brake plate increases, the eddy current intensity increases, and the braking force increases accordingly.

[0015] In one possible implementation, the width of the rectangular plate adjacent to the trapezoidal plate is the same as the maximum width of the trapezoidal plate.

[0016] In one possible implementation, the eddy current brake plate is positioned parallel to the vehicle's direction of travel, and as the vehicle passes the eddy current brake plate, it passes sequentially through the trapezoidal plate and the plurality of rectangular plates.

[0017] Secondly, embodiments of the present invention provide an eddy current brake plate design device, the device comprising:

[0018] The determination module is used to determine the braking acceleration index based on the braking requirements of the magnetic levitation propulsion system, wherein the braking requirements include operating speed and braking time.

[0019] The calculation module is used to calculate the target braking force corresponding to the braking acceleration index;

[0020] The simulation module is used to simulate the braking force curves under different plate widths using electromagnetic simulation software. The braking force curve is the curve of braking force changing with speed.

[0021] The selection module is used to select the optimal braking force curve from the braking force curve based on the target braking force.

[0022] The design module is used to design the eddy current brake plate based on the plate width corresponding to the optimal braking force curve.

[0023] In one possible implementation, the selection module includes:

[0024] The query submodule is used to query the corresponding braking force based on the braking force curve and the vehicle's operating speed.

[0025] A sub-module is selected to identify the braking force curve that is smaller than the target braking force and closest to the target braking force as the optimal braking force curve.

[0026] Thirdly, embodiments of the present invention provide a computer device, the computer device including one or more processors; a memory; and one or more computer programs, wherein the one or more computer programs are stored in the memory, and the one or more computer programs include instructions that, when executed by the computer device, cause the computer device to perform the eddy current brake plate design method as described in the first aspect or any possible implementation of the first aspect.

[0027] Fourthly, embodiments of the present invention provide a computer-readable storage medium comprising a stored program, wherein, when the program is executed, it controls the device containing the computer-readable storage medium to perform the eddy current brake plate design method as described in the first aspect or any possible implementation thereof.

[0028] In the technical solution provided by the embodiments of the present invention, by simulating the braking force curves under different plate widths, the braking characteristics under different plate widths can be quickly and accurately understood, thereby quickly designing eddy current brake plates that meet braking requirements and improving braking performance.

[0029] In this embodiment of the invention, the vehicle is first braked by a trapezoidal plate, thereby avoiding excessive braking force at the initial stage of braking and reducing the risk of the superconducting magnet losing quench. Following the trapezoidal plate are multiple rectangular plates with progressively increasing widths to compensate for the decrease in braking force caused by reduced operating speed. This increases braking capability at low speeds, reduces the overall braking distance, and improves the braking performance of the eddy current brake plate. Attached Figure Description

[0030] Figure 1 This is a flowchart illustrating a design method for an eddy current brake plate provided in an embodiment of the present invention.

[0031] Figure 2 This is a schematic diagram of the traction curve of a magnetic levitation propulsion system provided in an embodiment of the present invention.

[0032] Figure 3 This is a schematic diagram of a braking force curve provided in an embodiment of the present invention.

[0033] Figure 4 This is a schematic diagram of an eddy current braking plate provided in an embodiment of the present invention.

[0034] Figure 5 This is a schematic diagram of a braking acceleration curve provided in an embodiment of the present invention.

[0035] Figure 6 This is a schematic diagram of a vehicle operating speed curve provided in an embodiment of the present invention.

[0036] Figure 7 This is a schematic diagram of a braking distance curve provided in an embodiment of the present invention.

[0037] Figure 8 This is a schematic diagram of the structure of an eddy current brake plate design device provided in an embodiment of the present invention.

[0038] Figure 9 This is a schematic diagram of a computer device provided in an embodiment of the present invention. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this invention clearer and more understandable, the invention will be further described below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0040] Figure 1 This is a flowchart illustrating a design method for an eddy current brake plate according to an embodiment of the present invention, as shown below. Figure 1 As shown, the method includes:

[0041] Step 101: Determine the braking acceleration index based on the braking requirements of the magnetic levitation propulsion system.

[0042] In this embodiment of the invention, the braking requirement includes operating speed and braking time. The braking acceleration index is the rate of change of speed required for the vehicle to reduce its operating speed to zero within the braking time to fulfill the braking requirement. For example, if the vehicle's current operating speed is 150 m / s and the braking time is 3 seconds, the braking requirement is to reduce the vehicle's operating speed from 150 m / s to 0 m / s within 3 seconds. In this case, the braking acceleration index is 50 m / s. 2 In practical applications, the number and value of braking acceleration indicators can be set based on the vehicle's common braking requirements, which can be referenced from the traction curve of the magnetic levitation propulsion system. This embodiment of the invention does not limit this.

[0043] Figure 2 A schematic diagram of the traction curve of a magnetic levitation propulsion system provided in an embodiment of the present invention, as shown below. Figure 2As shown, the horizontal axis of the traction curve represents time, and the vertical axis represents velocity. The traction curve illustrates the relationship between the vehicle's velocity and time at different operating stages, including acceleration (0–t3), constant speed (t3–t4), and deceleration (t4–t7). The acceleration stage includes acceleration-to-acceleration (0–t1), constant acceleration (t1–t2), and deceleration (t2–t3), while the deceleration stage includes acceleration-to-deceleration (t4–t5), constant deceleration (t5–t6), and deceleration (t6–t7). Based on the traction curve, the vehicle's common braking requirements are determined, and thus the braking acceleration index is determined. During the entire operation of the vehicle, the maximum operating speed is v. m For example, braking requirement is to reduce the vehicle's operating speed from its maximum operating speed v within the braking time. m When the temperature drops to zero, the braking time can be referenced to the time interval between t4 and t7.

[0044] Step 102: Calculate the target braking force corresponding to the braking acceleration index.

[0045] In this step, based on the law of acceleration, the target braking force is calculated according to the vehicle mass and braking acceleration index. The target braking force is the product of the vehicle mass and the braking acceleration index.

[0046] Step 103: Simulate the braking force curves under different plate widths using electromagnetic simulation software. The braking force curve is the curve of braking force changing with speed.

[0047] Figure 3 A schematic diagram of a braking force curve provided in an embodiment of the present invention, such as... Figure 3 As shown, the braking force curve has speed on the horizontal axis (m / s) and braking force on the vertical axis (N). Before the vehicle reaches the critical speed, the braking force increases with increasing speed. After the vehicle reaches the critical speed, i.e., in the high-speed region, the braking force tends to stabilize and remains essentially unchanged with increasing speed. For example, the critical speed is 210 m / s. Before the vehicle reaches the critical speed, the curve is divided into a linear region and a nonlinear region. In the linear region (0–60 m / s), the braking force increases approximately linearly with increasing speed. In the nonlinear region (60–210 m / s), the braking force increases nonlinearly with increasing speed, and the increase in braking force tends to level off with increasing speed.

[0048] Step 104: Select the optimal braking force curve from the braking force curves based on the target braking force.

[0049] In this step, based on the braking force curve, the corresponding braking force is retrieved according to the vehicle's operating speed. The braking force curve corresponding to the braking force that is less than the target braking force and closest to the target braking force is taken as the optimal braking force curve. For example, when the vehicle's operating speed is 150 m / s, the target braking force is 130,000 N. The braking force curve with the first plate width corresponds to 128,000 N at the same speed, the braking force curve with the second plate width corresponds to 131,000 N, and the braking force curve with the third plate width corresponds to 125,000 N. In this case, although the braking force of the second plate width at this operating speed is closest to the target braking force, it is greater than the target braking force. When the braking force is too large, the huge braking force will impact the superconducting magnet, which may cause the superconducting magnet to lose its superconducting property of zero resistance. It is difficult to recover quickly, which will affect the train's operating safety. Therefore, while ensuring driving safety, considering braking performance, the braking force curve of the first plate width is taken as the optimal braking force curve.

[0050] Step 105: Design the eddy current brake plate based on the plate width corresponding to the optimal braking force curve.

[0051] When a maglev train passes an eddy current brake plate at a certain speed, electromagnetic induction occurs between the brake plate and the vehicle's magnetic field, inducing eddy currents. The faster the vehicle travels, the faster the relative speed between the vehicle's magnetic field and the eddy current brake plate, the faster the magnetic field lines are cut, and the stronger the induced eddy currents, resulting in stronger braking force. Conversely, the slower the vehicle travels, the slower the relative speed between the vehicle's magnetic field and the eddy current brake plate, the slower the magnetic field lines are cut, and the weaker the induced eddy currents, resulting in weaker braking force.

[0052] In this embodiment of the invention, the eddy current brake plate includes a trapezoidal plate and multiple rectangular plates; the trapezoidal plate and the multiple rectangular plates are located on the same central axis. Multiple rectangular plates are sequentially connected to the side of the trapezoidal plate with the maximum width, and the width of the multiple rectangular plates increases sequentially. The width of the rectangular plates adjacent to the trapezoidal plate is the same as the maximum width of the trapezoidal plate. The eddy current brake plate is positioned parallel to the vehicle's direction of travel, and when the vehicle passes over the eddy current brake plate, it passes over the trapezoidal plate and the multiple rectangular plates sequentially.

[0053] Figure 4 This is a schematic diagram of an eddy current braking plate provided in an embodiment of the present invention, as shown below. Figure 4As shown, the description uses an eddy current brake plate consisting of a trapezoidal plate and three rectangular plates as an example. The trapezoidal plate and the three rectangular plates are located on the same central axis. The first rectangular plate 2, the second rectangular plate 3, and the third rectangular plate 4 are sequentially connected to the side of the trapezoidal plate 1 with its maximum width. The width of the first rectangular plate 2 is the same as the maximum width of the trapezoidal plate 1, and the widths of the first rectangular plate 2, the second rectangular plate 3, and the third rectangular plate 4 increase sequentially. As the plate width increases, the effective interaction area between the vehicle's magnetic field and the eddy current brake plate increases; that is, the area of ​​the eddy current brake plate within the magnetic field coverage increases, the eddy current intensity increases, and the braking force increases accordingly. Through the segmented design with gradually increasing plate width, the braking performance of the eddy current brake plate is improved to compensate for the decrease in braking force caused by the decrease in vehicle speed.

[0054] like Figure 4 As shown, the width of trapezoidal plate 1 increases uniformly between the minimum width (i.e., the width of the upper base plate of the trapezoidal plate) and the maximum width (i.e., the width of the lower base plate of the trapezoidal plate). When the vehicle passes over the eddy current brake plate, it first passes through the minimum width of trapezoidal plate 1. As the width of trapezoidal plate 1 gradually increases, the effective interaction area between the vehicle's magnetic field and trapezoidal plate 1 gradually increases. That is, the area of ​​the eddy current brake plate within the coverage of the vehicle's magnetic field gradually increases, the eddy current intensity gradually increases, and the braking force correspondingly gradually increases. This avoids excessive braking force in the initial stage of braking, which could cause a large impact on the superconducting magnet and reduce the risk of the superconducting magnet losing quench.

[0055] Figure 5 This is a schematic diagram of a braking acceleration curve provided in an embodiment of the present invention, as shown below. Figure 5 As shown, the horizontal axis of the braking acceleration curve represents time (in seconds), and the vertical axis represents braking acceleration, with gravitational acceleration g as a reference. Between 0 and 0.3 seconds, as the width of the trapezoidal brake plate gradually increases, the braking force gradually increases, and the braking acceleration continuously increases. After 2.5 seconds, as the vehicle's speed decreases, the induced eddy current intensity weakens, the generated braking force continuously decreases, and the braking performance continuously declines. At this point, increasing the width of the eddy current brake plate improves braking performance. The increase in plate width compensates for some of the decrease in braking force caused by the decrease in vehicle speed, keeping the braking acceleration within a certain range. After 3.5 seconds, the plate width no longer changes, and the braking acceleration rapidly decreases. Through the variable-width eddy current brake plate, good braking performance can be achieved throughout the entire braking process.

[0056] Figure 6 This is a schematic diagram of a vehicle operating speed curve provided in an embodiment of the present invention, such as... Figure 6As shown, the horizontal axis of the speed curve represents time in seconds (s), and the vertical axis represents speed in meters per second (m / s). Between 0 and 3.3 seconds, the speed decreases almost linearly. Between 3.3 and 4 seconds, the braking acceleration decreases rapidly, and the vehicle's speed gradually decreases until it reaches zero.

[0057] Figure 7 A schematic diagram of a braking distance curve provided in an embodiment of the present invention, as shown below. Figure 7 As shown, the horizontal axis of the braking distance curve represents time (seconds), and the vertical axis represents braking distance (meters). The braking distance continuously increases until the vehicle's speed reaches zero, at which point the braking distance stops increasing. Furthermore, as the vehicle's speed decreases, the rate of increase in braking distance gradually levels off.

[0058] In the technical solution provided by the embodiments of the present invention, by simulating the braking force curves under different plate widths, the braking characteristics under different plate widths can be quickly and accurately understood, thereby quickly designing eddy current brake plates that meet braking requirements and improving braking performance.

[0059] In this embodiment of the invention, the vehicle is first braked by a trapezoidal plate, thereby avoiding excessive braking force at the initial stage of braking and reducing the risk of the superconducting magnet losing quench. Following the trapezoidal plate are multiple rectangular plates with progressively increasing widths to compensate for the decrease in braking force caused by reduced operating speed. This increases braking capability at low speeds, reduces the overall braking distance, and improves the braking performance of the eddy current brake plate.

[0060] Figure 8 This is a schematic diagram of the structure of an eddy current brake plate design device provided in an embodiment of the present invention, as shown below. Figure 8 As shown, the device includes a determination module 11, a calculation module 12, a simulation module 13, a selection module 14, and a design module 15. The determination module 11 is used to determine the braking acceleration index based on the braking requirements of the magnetic levitation propulsion system, including operating speed and braking time. The calculation module 12 is used to calculate the target braking force corresponding to the braking acceleration index. The simulation module 13 is used to simulate the braking force curves under different plate widths using electromagnetic simulation software; the braking force curves are curves showing the change of braking force with speed. The selection module 14 is used to select the optimal braking force curve from the braking force curves based on the target braking force. The design module 15 is used to design the eddy current braking plate based on the plate width corresponding to the optimal braking force curve.

[0061] In this embodiment of the invention, the selection module 14 includes a query submodule and a selection submodule. The query submodule is used to query the corresponding braking force based on the braking force curve and the vehicle's operating speed; the selection submodule is used to select the braking force curve corresponding to the braking force that is less than the target braking force and closest to the target braking force as the optimal braking force curve.

[0062] In the technical solution provided by the embodiments of the present invention, by simulating the braking force curves under different plate widths, the braking characteristics under different plate widths can be quickly and accurately understood, thereby quickly designing eddy current brake plates that meet braking requirements and improving braking performance.

[0063] In this embodiment of the invention, the vehicle is first braked by a trapezoidal plate, thereby avoiding excessive braking force at the initial stage of braking and reducing the risk of the superconducting magnet losing quench. Following the trapezoidal plate are multiple rectangular plates with progressively increasing widths to compensate for the decrease in braking force caused by reduced operating speed. This increases braking capability at low speeds, reduces the overall braking distance, and improves the braking performance of the eddy current brake plate.

[0064] This invention provides a computer-readable storage medium including a stored program, wherein, when the program is running, it controls the device where the computer-readable storage medium is located to execute the steps of the above-described eddy current brake plate design method. For a detailed description, please refer to the above-described embodiments of the eddy current brake plate design method.

[0065] Figure 9 A schematic diagram of a computer device provided in an embodiment of the present invention, such as... Figure 9 As shown, the computer device 3 in this embodiment includes a processor 301, a memory 302, and a computer program 303 stored in the memory 302 and executable on the processor 301. When the processor 301 executes the computer program 303, it implements the steps in the various method embodiments described above. Alternatively, when the processor 301 executes the computer program 303, it implements the functions of each module / unit in the various device embodiments described above.

[0066] Computer device 3 can be an electronic device such as a desktop computer, laptop, handheld computer, or cloud computing device. Computer device 3 may include, but is not limited to, a processor 301 and a memory 302. Those skilled in the art will understand that... Figure 9 This is merely an example of computer device 3 and does not constitute a limitation on computer device 3. It may include more or fewer components than shown, or different components.

[0067] The processor 301 can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0068] The memory 302 can be an internal storage unit of the computer device 3, such as a hard disk or RAM of the computer device 3. The memory 302 can also be an external storage device of the computer device 3, such as a plug-in hard disk, SmartMedia Card (SMC), Secure Digital (SD) card, or Flash Card. The memory 302 can also include both internal and external storage units of the computer device 3. The memory 302 is used to store computer programs and other programs and data required by the electronic device.

[0069] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0070] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A design method for an eddy current brake plate, characterized in that, The method includes: Based on the braking requirements of the magnetic levitation propulsion system, a braking acceleration index is determined, which includes operating speed and braking time. Calculate the target braking force corresponding to the braking acceleration index; Using electromagnetic simulation software, the braking force curves under different plate widths are simulated. The braking force curve is the curve of braking force changing with speed. Based on the target braking force, the optimal braking force curve is selected from the braking force curve; The eddy current brake plate is designed based on the plate width corresponding to the optimal braking force curve.

2. The method according to claim 1, characterized in that, The step of selecting the optimal braking force curve from the braking force curve based on the target braking force includes: Based on the braking force curve, the corresponding braking force can be retrieved according to the vehicle's operating speed. The braking force curve corresponding to the braking force that is less than the target braking force and is closest to the target braking force is taken as the optimal braking force curve.

3. The method according to claim 1, characterized in that, The eddy current braking plate includes a trapezoidal plate and multiple rectangular plates; the trapezoidal plate and the multiple rectangular plates are on the same central axis; multiple rectangular plates are sequentially connected to the side with the maximum width of the trapezoidal plate, and the width of the multiple rectangular plates increases sequentially.

4. The method according to claim 3, characterized in that, As the width of the brake plate increases, the effective interaction area between the vehicle's magnetic field and the eddy current brake plate increases, the eddy current intensity increases, and the braking force increases accordingly.

5. The method according to claim 3, characterized in that, The width of the rectangular plate that follows the trapezoidal plate is the same as the maximum width of the trapezoidal plate.

6. The method according to claim 3, characterized in that, The eddy current brake plate is positioned parallel to the vehicle's direction of travel. When the vehicle passes the eddy current brake plate, it passes the trapezoidal plate and the plurality of rectangular plates in sequence.

7. A design device for an eddy current braking plate, characterized in that, The device includes: The determination module is used to determine the braking acceleration index based on the braking requirements of the magnetic levitation propulsion system, wherein the braking requirements include operating speed and braking time. The calculation module is used to calculate the target braking force corresponding to the braking acceleration index; The simulation module is used to simulate the braking force curves under different plate widths using electromagnetic simulation software. The braking force curve is the curve of braking force changing with speed. The selection module is used to select the optimal braking force curve from the braking force curve based on the target braking force. The design module is used to design the eddy current brake plate based on the plate width corresponding to the optimal braking force curve.

8. The apparatus according to claim 7, characterized in that, The selection module includes: The query submodule is used to query the corresponding braking force based on the braking force curve and the vehicle's operating speed. A sub-module is selected to identify the braking force curve that is smaller than the target braking force and closest to the target braking force as the optimal braking force curve.

9. A computer device, characterized in that, The computer device includes one or more processors; a memory; and one or more computer programs, wherein the one or more computer programs are stored in the memory, and the one or more computer programs include instructions that, when executed by the computer device, cause the computer device to perform the eddy current brake plate design method according to any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the device containing the computer-readable storage medium to perform the eddy current brake plate design method as described in any one of claims 1-6.

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