Nuclear magnetic coil vibration analysis method and device, electronic equipment and storage medium

Abstract

The invention relates to a nuclear magnetic coil vibration analysis method and device, electronic equipment and a storage medium, and the method comprises the steps: carrying out the mesh generation of a coil geometric model of a nuclear magnetic coil, obtaining a finite element model, carrying out the modal analysis of the finite element model, and obtaining a modal simulation result. Under the condition that the error rate of the modal simulation result and the simulation test result is smaller than a first preset threshold value, the target electromagnetic force generated in the working state is applied to the finite element model, harmonic response analysis is carried out, and a harmonic response simulation result close to the real working state of the nuclear magnetic coil can be obtained; therefore, vibration analysis can be carried out on the nuclear magnetic coil based on the harmonic response simulation result, and a data basis is provided for optimization of the nuclear magnetic coil due to the fact that simulation analysis is carried out on vibration of the nuclear magnetic coil.

Description

Technical Field

[0001] The present application relates to the technical field of nuclear magnetic coil vibration simulation, and in particular to a nuclear magnetic coil vibration analysis method, device, electronic equipment and storage medium. Background Art

[0002] Magnetic resonance imaging technology has important applications in medical diagnosis. However, during operation, the MRI coil will vibrate due to the electromagnetic force. This vibration will not only affect the imaging quality and generate noise, but may also damage the MRI equipment. Therefore, how to effectively simulate and analyze the vibration characteristics of the MRI coil has become an urgent problem to be solved. Summary of the invention

[0003] The present application provides a nuclear magnetic coil vibration analysis method, device, electronic device and storage medium to solve the technical problem of how to simulate and analyze the vibration of a nuclear magnetic coil.

[0004] In a first aspect, the present application provides a method for analyzing nuclear magnetic coil vibration, the method comprising:

[0005] Establish the coil geometry model of the MRI coil;

[0006] Meshing the coil geometric model to generate a finite element model;

[0007] Performing modal analysis on the finite element model to obtain modal simulation results;

[0008] When the error rate between the modal simulation result and the simulation test result is less than a first preset threshold, a target electromagnetic force is applied to the finite element model and a harmonic response analysis is performed to obtain a harmonic response simulation result; wherein the target electromagnetic force is the electromagnetic force generated by the nuclear magnetic coil in a working state;

[0009] A vibration analysis is performed on the nuclear magnetic coil according to the harmonic response simulation result.

[0010] Optionally, a coil geometry model of a nuclear magnetic coil is established, including:

[0011] Establishing a first geometric model based on the dimensions and material parameters of the nuclear magnetic coil;

[0012] Obtaining boundary conditions and load conditions of the nuclear magnetic coil; wherein the boundary conditions are used to characterize the equivalent connection mode of the nuclear magnetic coil, and the load conditions are used to characterize the target electromagnetic force;

[0013] The boundary condition and the load condition are input into the first geometric model to obtain the coil geometric model.

[0014] Optionally, when the error rate between the modal simulation result and the simulation test result is less than a first preset threshold, applying a target electromagnetic force to the finite element model and performing a harmonic response analysis to obtain a harmonic response simulation result includes:

[0015] Obtaining simulation test results of the nuclear magnetic coil;

[0016] Calculating the error rate between the modal simulation result and the simulation test result;

[0017] When the error rate is less than the first preset threshold, a target electromagnetic force is applied to the finite element model and a harmonic response analysis is performed to obtain a harmonic response simulation result.

[0018] Optionally, applying a target electromagnetic force to the finite element model and performing a harmonic response analysis to obtain a harmonic response simulation result includes:

[0019] Applying the target electromagnetic force to the finite element model simulation;

[0020] The harmonic response analysis of the finite element model is performed using the modal superposition method to obtain the harmonic response simulation result.

[0021] Optionally, performing vibration analysis on the nuclear magnetic coil according to the harmonic response simulation result includes:

[0022] Obtaining a working modal test result of the nuclear magnetic coil;

[0023] When the error rate between the harmonic response simulation result and the working modal test result is less than a second preset threshold, identifying a critical frequency value in the harmonic response simulation result; wherein, at the critical frequency value, the vibration amplitude of the nuclear magnetic coil is the largest;

[0024] The critical frequency value is used as the vibration analysis result.

[0025] Optionally, after identifying the critical frequency value in the harmonic response simulation result, the method further comprises:

[0026] Based on the critical frequency value, adjusting the structural parameters and / or material parameters of the coil geometric model; wherein the structural parameters include at least one of the external dimensions and boundary conditions;

[0027] When the adjustment is completed, the step of meshing the coil geometric model to generate a finite element model is re-executed, and then the step of performing vibration analysis on the nuclear magnetic coil according to the harmonic response simulation result is performed.

[0028] Optionally, adjusting the structural parameters and / or material parameters of the coil geometric model based on the critical frequency value includes:

[0029] Analyze the structural influence weight and material influence weight of the critical frequency value;

[0030] If the structural influence weight is greater than the preset weight, adjusting the structural parameters of the coil geometric model;

[0031] If the material influence weight is greater than the preset weight, the material parameters of the coil geometric model are adjusted; wherein the material parameters include at least one of a material ratio and a material type.

[0032] In a second aspect, the present application provides a nuclear magnetic coil vibration analysis device, the device comprising:

[0033] A geometric model building module is used to build a coil geometric model of a nuclear magnetic coil;

[0034] A finite element model generation module, used for meshing the coil geometric model to generate a finite element model;

[0035] A modal analysis module, used to perform modal analysis on the finite element model to obtain modal simulation results;

[0036] A harmonic response analysis module, configured to apply a target electromagnetic force to the finite element model and perform a harmonic response analysis to obtain a harmonic response simulation result when the error rate between the modal simulation result and the simulation test result is less than a first preset threshold value; wherein the target electromagnetic force is the electromagnetic force generated by the nuclear magnetic coil in a working state;

[0037] A vibration analysis module is used to perform vibration analysis on the nuclear magnetic coil according to the harmonic response simulation result.

[0038] In a third aspect, the present application provides an electronic device, including a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other via the communication bus;

[0039] Memory, used to store computer programs;

[0040] The processor is used to implement the nuclear magnetic coil vibration analysis method described in any embodiment of the first aspect when executing the program stored in the memory.

[0041] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the nuclear magnetic coil vibration analysis method as described in any embodiment of the first aspect is implemented.

[0042] The above-mentioned technical solution provided by the embodiment of the present application has the following advantages over the prior art: the method provided by the embodiment of the present application establishes a coil geometry model of the nuclear magnetic coil; meshes the coil geometry model to generate a finite element model; performs modal analysis on the finite element model to obtain modal simulation results; when the error rate between the modal simulation results and the simulation test results is less than a first preset threshold, applies a target electromagnetic force to the finite element model and performs a harmonic response analysis to obtain a harmonic response simulation result; wherein the target electromagnetic force is the electromagnetic force generated by the nuclear magnetic coil in a working state; and performs a vibration analysis on the nuclear magnetic coil according to the harmonic response simulation result. The method meshes the coil geometry model of the nuclear magnetic coil to obtain a finite element model, performs modal analysis on the finite element model to obtain a modal simulation result, and when the error rate between the modal simulation result and the simulation test result is less than a first preset threshold, applies the target electromagnetic force generated in the working state to the finite element model and performs a harmonic response analysis, so as to obtain a harmonic response simulation result close to the actual working state of the nuclear magnetic coil, thereby performing a vibration analysis on the nuclear magnetic coil based on the harmonic response simulation result. Since the vibration simulation analysis of the nuclear magnetic coil is realized, a data basis is provided for the optimization of the nuclear magnetic coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0044] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0045] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0046] Figure 1 A system architecture diagram of a nuclear magnetic coil vibration analysis method provided in one embodiment of the present application;

[0047] Figure 2 A schematic flow chart of a nuclear magnetic coil vibration analysis method provided in one embodiment of the present application;

[0048] Figure 3 A schematic flow chart of a nuclear magnetic coil vibration analysis method provided in another embodiment of the present application;

[0049] Figure 4 A schematic diagram of the structure of a nuclear magnetic coil vibration analysis device provided in one embodiment of the present application;

[0050] Figure 5 A schematic diagram of the structure of an electronic device provided for one embodiment of the present application. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0052] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0053] In order to solve the technical problem of how to simulate and analyze the vibration of a nuclear magnetic coil in the prior art, the present application provides a nuclear magnetic coil vibration analysis method, device, electronic device and storage medium, which can realize the simulation analysis of the vibration of the nuclear magnetic coil and provide a data basis for the optimization of the nuclear magnetic coil.

[0054] The first embodiment of the present application provides a method for analyzing nuclear magnetic coil vibration. The method can be applied to Figure 1 The system architecture shown includes at least a data acquisition module 101 and a simulation analysis module 102 , and the data acquisition module 101 and the simulation analysis module 102 establish a communication connection.

[0055] Next, based on the system architecture, the nuclear magnetic coil vibration analysis method is described in detail, such as Figure 2 , the nuclear magnetic coil vibration analysis method includes:

[0056] Step 201, establishing a coil geometry model of a nuclear magnetic resonance coil.

[0057] In one embodiment, a coil geometry model of a nuclear magnetic coil is established, including: establishing a first geometry model based on the outer dimensions and material parameters of the nuclear magnetic coil; obtaining boundary conditions and load conditions of the nuclear magnetic coil; wherein the boundary conditions are used to characterize the equivalent connection mode of the nuclear magnetic coil, and the load conditions are used to characterize the target electromagnetic force; and inputting the boundary conditions and load conditions into the first geometry model to obtain the coil geometry model.

[0058] In this embodiment, a first geometric model can be established based on the outer dimensions and material parameters of the nuclear magnetic coil. The outer dimensions can be the design dimensions of the nuclear magnetic coil or the dimensions actually measured, without limitation. The material parameters can be the types of materials used in the nuclear magnetic coil and the ratio of each type of material. The first geometric model established based on the outer dimensions and material parameters of the nuclear magnetic coil can truly simulate the nuclear magnetic coil, and further, obtain the boundary conditions and load conditions of the nuclear magnetic coil, wherein the boundary conditions can be, for example, the internal connection mode between the layers of the coil, and the external connection mode between the coil and the whole nuclear magnetic equipment, such as the internal coil layers can be bound contact, and the external can be fixed by connecting parts, etc., without limitation, and the equivalent connection mode of the nuclear magnetic coil can be simulated by the boundary conditions, and the load condition can be the electromagnetic force generated by the nuclear magnetic coil in the working state, such as the target electromagnetic force. Specifically, the electromagnetic force may include the distribution and magnitude of the electromagnetic force, for example, the force on all nodes of the entire coil layer when working. For example, if the coil layer includes 4000 nodes, the electromagnetic force may be composed of the X, Y, and Z axis coordinates of the 4000 points and the X-direction force, Y-direction force, and Z-direction force of each of the 4000 points. The magnitude of the specific electromagnetic force may be obtained by electromagnetic simulation or by calculating various parameters of the actual device without limitation. By inputting the boundary conditions and load conditions into the first geometric model, a coil geometric model equivalent to a real nuclear magnetic coil may be obtained.

[0059] Step 202: mesh the coil geometry model to generate a finite element model.

[0060] The coil geometry model can be meshed using finite element analysis software to generate a finite element model.

[0061] Since the denser the meshing, the higher the calculation accuracy, but the corresponding amount of calculation will also increase, it is necessary to reasonably control the density of meshing while ensuring accuracy. For example, meshing can be comprehensively considered and reasonably planned according to the geometric shape of the coil, material properties, and calculation requirements. For example, the mesh of the coil layer of the nuclear magnetic coil can be encrypted to improve the calculation accuracy, and the mesh density of the filling layer of the nuclear magnetic coil can be appropriately reduced to improve the calculation speed. Furthermore, meshing can be combined with geometric shapes. For example, for the coil layer, the geometric shape of the coil needs to be clarified, including parameters such as the diameter, length, and number of turns of the coil. Mesh encryption should be performed between turns of the coil and in areas with high current density to improve calculation accuracy. For the filling layer, the electromagnetic properties of the filling material, such as conductivity and magnetic permeability, should be considered, which will affect the fineness of the meshing. For uniform material areas, coarser meshes can be used; for material interfaces or gradient change areas, mesh encryption can be performed. It should be understood that after the meshing is completed, the mesh quality can be checked to ensure the reliability and calculation accuracy of the mesh.

[0062] Step 203: Perform modal analysis on the finite element model to obtain modal simulation results.

[0063] Modal analysis of the finite element model can be performed to analyze parameters such as the natural frequency and vibration mode of the nuclear magnetic coil in a non-working state. The modal simulation results obtained can represent the natural frequency and vibration mode of the nuclear magnetic coil.

[0064] Step 204, when the error rate between the modal simulation result and the simulation test result is less than a first preset threshold, apply a target electromagnetic force to the finite element model and perform a harmonic response analysis to obtain a harmonic response simulation result; wherein the target electromagnetic force is the electromagnetic force generated by the nuclear magnetic coil in a working state.

[0065] The harmonic response simulation results may include, for example, analysis results such as vibration amplitude, acceleration, displacement, and stress distribution obtained through harmonic response analysis, without limitation.

[0066] In one embodiment, when the error rate between the modal simulation results and the simulation test results is less than a first preset threshold, a target electromagnetic force is applied to the finite element model and a harmonic response analysis is performed to obtain a harmonic response simulation result, including: obtaining the simulation test results of the nuclear magnetic coil; calculating the error rate between the modal simulation results and the simulation test results; when the error rate is less than a first preset threshold, a target electromagnetic force is applied to the finite element model and a harmonic response analysis is performed to obtain a harmonic response simulation result.

[0067] In this embodiment, in order to determine the rationality of the modal simulation results obtained by modal analysis, the simulation test results of the nuclear magnetic coil can be obtained, wherein the simulation test results can be static parameter collection of the real nuclear magnetic coil, for example, using a vibration hammer to knock, and collecting simulation test results, such as collecting the natural frequency and vibration mode of the nuclear magnetic coil, and calculating the error rate between the modal simulation results and the simulation test results. The simulation test results can be used as a benchmark, and the difference between the first natural frequency in the modal simulation results and the second natural frequency in the simulation test results and the ratio of the second natural frequency are used as the error rate. If the error rate is less than a first preset threshold, such as less than 10%, it means that the simulation effect of the modal simulation results obtained by the modal analysis is good, and the natural frequency and vibration mode of the nuclear magnetic coil obtained by the modal simulation are close to the true value.

[0068] In one embodiment, a target electromagnetic force is applied to a finite element model and a harmonic response analysis is performed to obtain a harmonic response simulation result, including: applying a target electromagnetic force to the finite element model in a simulated manner; and performing a harmonic response analysis on the finite element model using a modal superposition method to obtain a harmonic response simulation result.

[0069] In this embodiment, when performing harmonic response analysis on the finite element model, a target electromagnetic force can be applied to the nuclear magnetic coil in the finite element model. The target electromagnetic force can reflect the electromagnetic force of the nuclear magnetic coil in the actual working state, which can be obtained through electromagnetic simulation or actual calculation. The electromagnetic force of the nuclear magnetic coil in the actual working state includes the magnitude and direction of the electromagnetic force of each node of the coil. During the harmonic response analysis, the target electromagnetic force can be applied to each node according to the magnitude and direction of the electromagnetic force corresponding to the node, ensuring the simulation of the working scene of the real nuclear magnetic coil, and using the modal superposition method to perform harmonic response analysis on the finite element model to obtain the harmonic response simulation result.

[0070] Step 205: Perform vibration analysis on the nuclear magnetic coil according to the harmonic response simulation result.

[0071] The method meshes the coil geometry model of the nuclear magnetic coil to obtain a finite element model, performs modal analysis on the finite element model to obtain a modal simulation result, and when the error rate between the modal simulation result and the simulation test result is less than a first preset threshold, applies the target electromagnetic force generated in the working state to the finite element model and performs a harmonic response analysis, so as to obtain a harmonic response simulation result close to the actual working state of the nuclear magnetic coil, thereby performing a vibration analysis on the nuclear magnetic coil based on the harmonic response simulation result. Since the vibration simulation analysis of the nuclear magnetic coil is realized, a data basis is provided for the optimization of the nuclear magnetic coil.

[0072] In one embodiment, vibration analysis of a nuclear magnetic coil is performed based on a harmonic response simulation result, including: obtaining an operating modal test result of the nuclear magnetic coil; identifying a critical frequency value in the harmonic response simulation result when an error rate between the harmonic response simulation result and the operating modal test result is less than a second preset threshold; wherein, at the critical frequency value, the vibration amplitude of the nuclear magnetic coil is the largest; and using the critical frequency value as the vibration analysis result.

[0073] In this embodiment, when performing vibration analysis on the nuclear magnetic coil according to the harmonic response simulation results, the rationality of the harmonic response simulation results can be judged first. For example, the working modal test results of the nuclear magnetic coil are obtained. When the error rate between the harmonic response simulation results and the working modal test results is less than the second preset threshold, the rationality of the harmonic response simulation results can be considered normal. At this time, the critical frequency values ​​in the harmonic response simulation results are identified and the critical frequency values ​​are used as the vibration analysis results. The harmonic response simulation results may include, for example, the vibration amplitude, acceleration, displacement, stress distribution and other parameters obtained by the harmonic response analysis, and the working modal test results also include the corresponding vibration amplitude, acceleration, displacement, stress distribution and other parameters. Taking the vibration amplitude as an example, the error rate between the harmonic response simulation results and the working modal test results is calculated. The working modal test results can be used as a benchmark, and the difference between the first critical frequency of the vibration amplitude in the harmonic response simulation results and the second critical frequency of the vibration amplitude in the working modal test results and the ratio of the second critical frequency are used as the error rate between the harmonic response simulation results and the working modal test results. If the error rate is less than the second preset threshold, such as less than 10%, it means that the simulation effect of the vibration amplitude in the harmonic response simulation results obtained by the harmonic response analysis is good, and the error rate comparisons of the other parameters are similar, which will not be repeated.

[0074] In one embodiment, after identifying the critical frequency value in the harmonic response simulation result, the method further includes: adjusting the structural parameters and / or material parameters of the coil geometry model based on the critical frequency value; wherein the structural parameters include at least one of the external dimensions and boundary conditions; and re-meshing the coil geometry model after the adjustment is completed to generate a finite element model, until the step of performing vibration analysis on the nuclear magnetic coil according to the harmonic response simulation result.

[0075] In this embodiment, after identifying the critical frequency value in the harmonic response simulation result, the structural parameters, material parameters and other parameters of the coil geometry model can be adjusted based on the critical frequency value to optimize the coil geometry model. After the optimization is completed, the nuclear magnetic coil vibration analysis method in this embodiment is re-executed to re-perform vibration analysis, such as optimizing material parameters to obtain a better material ratio, or optimizing structural parameters, etc., without limitation.

[0076] In one embodiment, based on the critical frequency value, the structural parameters and / or material parameters of the coil geometry model are adjusted, including: analyzing the structural influence weight and material influence weight of the critical frequency value; if the structural influence weight is greater than the preset weight, adjusting the structural parameters of the coil geometry model; if the material influence weight is greater than the preset weight, adjusting the material parameters of the coil geometry model; wherein the material parameters include at least one of material ratio and material type.

[0077] In this embodiment, the critical frequency value can be analyzed to determine the structural influence weight and material influence weight that affect the critical frequency value. The preset weight can be a predetermined weight. If the influence weight exceeds the preset weight, it means that the corresponding parameter needs to be adjusted. For example, the preset weight is 40%. If the structural influence weight is 70%, it is necessary to adjust the structural parameters of the coil-combined model, such as adjusting the outer dimensions of the MRI coil, or adjusting the internal connection method between the coil layers of the MRI coil or the external connection method between the coil and the entire MRI equipment, etc. If the material influence weight is 65%, it is necessary to adjust the material parameters of the MRI coil, such as adjusting the material ratio of the currently used materials, or choosing to replace one of the materials with other materials, etc., without restriction.

[0078] In one embodiment, after performing vibration analysis on the nuclear magnetic coil according to the harmonic response simulation result, the method further includes: generating a vibration analysis report according to the result of the vibration analysis.

[0079] In this embodiment, after performing vibration analysis on the nuclear magnetic coil according to the harmonic response simulation results, a vibration analysis report can also be generated according to the results of the vibration analysis, so as to facilitate obtaining various analysis parameters in the vibration analysis process and facilitate engineers to further optimize the nuclear magnetic coil.

[0080] In a specific embodiment, the nuclear magnetic coil vibration analysis method is as follows Figure 3 ,include:

[0081] Establish a physical model of the MRI coil structure;

[0082] Simplified physical model of nuclear magnetic coil;

[0083] Application of MRI coil materials;

[0084] MRI coil grid drawing;

[0085] If the meshing is unsuccessful, the step of simplifying the physical model of the nuclear magnetic coil is re-executed; if the meshing is successful, the step of setting the connection relationship is executed;

[0086] Setting of connection relationship;

[0087] Set the modal order;

[0088] Get the modal results;

[0089] The modal simulation results are compared with the test results. If the error is greater than 10%, the step of comparing the modal simulation results with the test results is repeated. If the error is less than 10%, the step of applying and setting the harmonic response load conditions is repeated.

[0090] Application and setting of harmonic response load conditions;

[0091] The harmonic response simulation results are post-processed and compared with the test results. If the error is greater than 10%, the steps of simplifying the physical model of the nuclear magnetic coil are re-executed to optimize the physical model of the nuclear magnetic coil. If the error is less than 10%, the vibration analysis of the nuclear magnetic coil can be performed based on the harmonic response simulation results.

[0092] In this embodiment, the vibration characteristics of the nuclear magnetic coil during operation can be accurately simulated, thereby providing data support for optimal design and fault diagnosis.

[0093] In the above-mentioned embodiments of the present application, by judging whether the error rate between the modal simulation results and the simulation test results is less than a first preset threshold value, the rationality of the modal simulation results can be ensured, and the modal simulation results close to the actual non-working state of the nuclear magnetic coil can be obtained. By judging whether the error rate between the harmonic response simulation results and the working modal test results is less than a second preset threshold value, the rationality of the harmonic response simulation results can be ensured, so that the harmonic response simulation results close to the actual working state of the nuclear magnetic coil can be obtained, and then the vibration analysis of the nuclear magnetic coil can be performed based on the harmonic response simulation results. Since accurate simulation analysis of the vibration of the nuclear magnetic coil is realized, a data basis is provided for the optimization of the nuclear magnetic coil.

[0094] Based on the same technical concept, the second embodiment of the present application provides a nuclear magnetic coil vibration analysis device, such as Figure 4 , the device comprises:

[0095] A geometric model building module 401 is used to build a coil geometric model of a nuclear magnetic coil;

[0096] A finite element model generation module 402 is used to perform meshing on the coil geometric model to generate a finite element model;

[0097] A modal analysis module 403 is used to perform modal analysis on the finite element model to obtain modal simulation results;

[0098] The harmonic response analysis module 404 is used to apply a target electromagnetic force to the finite element model and perform a harmonic response analysis to obtain a harmonic response simulation result when the error rate between the modal simulation result and the simulation test result is less than a first preset threshold value; wherein the target electromagnetic force is the electromagnetic force generated by the nuclear magnetic coil in a working state;

[0099] The vibration analysis module 405 is used to perform vibration analysis on the nuclear magnetic coil according to the harmonic response simulation result.

[0100] The device meshes the coil geometry model of the nuclear magnetic coil to obtain a finite element model, performs modal analysis on the finite element model to obtain a modal simulation result, and when the error rate between the modal simulation result and the simulation test result is less than a first preset threshold, applies the target electromagnetic force generated in the working state to the finite element model and performs a harmonic response analysis, so as to obtain a harmonic response simulation result close to the actual working state of the nuclear magnetic coil, thereby performing a vibration analysis on the nuclear magnetic coil based on the harmonic response simulation result. Since the vibration simulation analysis of the nuclear magnetic coil is realized, a data basis is provided for the optimization of the nuclear magnetic coil.

[0101] like Figure 5 As shown, an embodiment of the present application provides an electronic device, including a processor 111, a communication interface 112, a memory 113 and a communication bus 114, wherein the processor 111, the communication interface 112, and the memory 113 communicate with each other through the communication bus 114.

[0102] Memory 113, used for storing computer programs;

[0103] In one embodiment of the present application, the processor 111 is used to execute the program stored in the memory 113 to implement the nuclear magnetic coil vibration analysis method provided by any of the above method embodiments, including:

[0104] Establish the coil geometry model of the MRI coil;

[0105] Meshing the coil geometric model to generate a finite element model;

[0106] Performing modal analysis on the finite element model to obtain modal simulation results;

[0107] When the error rate between the modal simulation result and the simulation test result is less than a first preset threshold, a target electromagnetic force is applied to the finite element model and a harmonic response analysis is performed to obtain a harmonic response simulation result; wherein the target electromagnetic force is the electromagnetic force generated by the nuclear magnetic coil in a working state;

[0108] A vibration analysis is performed on the nuclear magnetic coil according to the harmonic response simulation result.

[0109] The communication bus mentioned in the above terminal can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The communication bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, only one thick line is used in the figure, but it does not mean that there is only one bus or one type of bus.

[0110] The communication interface is used for communication between the above terminal and other devices.

[0111] The memory may include a random access memory (RAM) or a non-volatile memory, such as at least one disk memory. Optionally, the memory may also be at least one storage device located away from the aforementioned processor.

[0112] The above-mentioned processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0113] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the nuclear magnetic coil vibration analysis method provided by any of the aforementioned method embodiments is implemented.

[0114] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0115] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a general hardware platform, and of course, by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the relevant technology can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0116] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0117] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. In the description, the suffixes such as "module", "component" or "unit" used to represent the elements are only used to facilitate the description of the present application and have no specific meaning in themselves. Therefore, "module", "component" or "unit" can be used in a mixed manner.

[0118] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A method for analyzing nuclear magnetic coil vibration, characterized in that: The method comprises: Establish the coil geometry model of the MRI coil; Meshing the coil geometric model to generate a finite element model; Performing modal analysis on the finite element model to obtain modal simulation results; When the error rate between the modal simulation result and the simulation test result is less than a first preset threshold, a target electromagnetic force is applied to the finite element model and a harmonic response analysis is performed to obtain a harmonic response simulation result; wherein the target electromagnetic force is the electromagnetic force generated by the nuclear magnetic coil in a working state; A vibration analysis is performed on the nuclear magnetic coil according to the harmonic response simulation result.

2. The method according to claim 1, characterized in that: Establish the coil geometry model of the MRI coil, including: Establishing a first geometric model based on the dimensions and material parameters of the nuclear magnetic coil; Obtaining boundary conditions and load conditions of the nuclear magnetic coil; wherein the boundary conditions are used to characterize the equivalent connection mode of the nuclear magnetic coil, and the load conditions are used to characterize the target electromagnetic force; The boundary condition and the load condition are input into the first geometric model to obtain the coil geometric model.

3. The method according to claim 1, characterized in that When the error rate between the modal simulation result and the simulation test result is less than a first preset threshold, applying a target electromagnetic force to the finite element model and performing a harmonic response analysis to obtain a harmonic response simulation result includes: Obtaining simulation test results of the nuclear magnetic coil; Calculating the error rate between the modal simulation result and the simulation test result; When the error rate is less than the first preset threshold, a target electromagnetic force is applied to the finite element model and a harmonic response analysis is performed to obtain a harmonic response simulation result.

4. The method according to claim 3, characterized in that Applying a target electromagnetic force to the finite element model and performing a harmonic response analysis to obtain a harmonic response simulation result, including: Applying the target electromagnetic force to the finite element model simulation; The harmonic response analysis of the finite element model is performed using the modal superposition method to obtain the harmonic response simulation result.

5. The method according to claim 1, characterized in that Performing vibration analysis on the nuclear magnetic coil according to the harmonic response simulation result includes: Obtaining a working modal test result of the nuclear magnetic coil; When the error rate between the harmonic response simulation result and the working modal test result is less than a second preset threshold, identifying a critical frequency value in the harmonic response simulation result; wherein, at the critical frequency value, the vibration amplitude of the nuclear magnetic coil is the largest; The critical frequency value is used as the vibration analysis result.

6. The method according to claim 5, characterized in that After identifying the critical frequency values ​​in the harmonic response simulation results, the method further includes: Based on the critical frequency value, adjusting the structural parameters and / or material parameters of the coil geometric model; wherein the structural parameters include at least one of the external dimensions and boundary conditions; When the adjustment is completed, the step of meshing the coil geometric model to generate a finite element model is re-executed, and then the step of performing vibration analysis on the nuclear magnetic coil according to the harmonic response simulation result is performed.

7. The method according to claim 6, characterized in that Based on the critical frequency value, adjusting the structural parameters and / or material parameters of the coil geometric model includes: Analyze the structural influence weight and material influence weight of the critical frequency value; If the structural influence weight is greater than the preset weight, adjusting the structural parameters of the coil geometric model; If the material influence weight is greater than the preset weight, the material parameters of the coil geometric model are adjusted; wherein the material parameters include at least one of a material ratio and a material type.

8. A nuclear magnetic coil vibration analysis device, characterized in that: The device comprises: A geometric model building module is used to build a coil geometric model of a nuclear magnetic coil; A finite element model generation module, used for meshing the coil geometric model to generate a finite element model; A modal analysis module, used to perform modal analysis on the finite element model to obtain modal simulation results; A harmonic response analysis module, configured to apply a target electromagnetic force to the finite element model and perform a harmonic response analysis to obtain a harmonic response simulation result when the error rate between the modal simulation result and the simulation test result is less than a first preset threshold value; wherein the target electromagnetic force is the electromagnetic force generated by the nuclear magnetic coil in a working state; A vibration analysis module is used to perform vibration analysis on the nuclear magnetic coil according to the harmonic response simulation result.

9. An electronic device, characterized in that: It includes a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other through the communication bus; Memory, used to store computer programs; The processor is used to implement the nuclear magnetic coil vibration analysis method described in any one of claims 1 to 7 when executing the program stored in the memory.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the nuclear magnetic coil vibration analysis method as described in any one of claims 1 to 7 is implemented.

Images