Vibration analysis method, device and equipment of generator stator and storage medium

Abstract

The invention relates to a vibration analysis method and device of a generator stator, equipment and a storage medium. The method comprises the steps of determining electromagnetic force of the generator stator based on a structural model of the generator stator; decomposing based on the electromagnetic force of the generator stator to obtain a plurality of force wave load components; the force wave load component comprises a plurality of load values distributed along the circumferential direction of the generator stator; and applying the plurality of force wave load components to the structural model of the generator stator to obtain the vibration response of the generator stator. According to the method, a plurality of force waves are superposed to simulate the rotation effect of the force waves in the actual operation process, the accurate load used for transient analysis is generated, the input load can be more accurate, and therefore the calculation result can truly reflect the dynamic response of the iron core along with time and space distribution; an analysis result is closer to an actual measurement result, and the reliability is higher.

Description

Technical Field

[0001] The present application relates to the technical field of generators, and in particular to a vibration analysis method, device, equipment, and storage medium for a generator stator. Background Art

[0002] The stator core is a crucial component of a hydro-generator, and its electromagnetic vibration can affect its operating efficiency. Existing techniques for analyzing the electromagnetic vibration of a hydro-generator's stator core primarily employ steady-state harmonic response analysis. This method applies simple harmonic excitation of a specified frequency and amplitude to calculate the structure's steady-state response. However, this method fails to accurately reflect the dynamic effects of electromagnetic forces on the stator core during actual operation, resulting in significant discrepancies between the analysis results and actual conditions. Summary of the Invention

[0003] The embodiments of the present application provide a vibration analysis method, apparatus, device and storage medium for a generator stator to solve the above-mentioned problems.

[0004] To achieve the above objectives, according to a first aspect of the present application, a vibration analysis method for a generator stator is provided, comprising:

[0005] The method comprises:

[0006] determining the electromagnetic force of the generator stator based on a structural model of the generator stator;

[0007] Decomposing the electromagnetic force of the generator stator to obtain a plurality of force wave load components; the force wave load components include a plurality of load values distributed along the circumferential direction of the generator stator;

[0008] The multiple force wave load components are applied to the structural model of the generator stator to obtain the vibration response of the generator stator.

[0009] Optionally, the electromagnetic force is a radial electromagnetic force of the generator stator at a preset position,

[0010] The electromagnetic force based on the generator stator is decomposed to obtain multiple force wave load components, including:

[0011] Based on the radial electromagnetic force, harmonic analysis is performed along the circumferential direction of the preset position to obtain multiple force wave load components corresponding to different circumferential petal numbers. The frequencies and amplitudes of the multiple force wave load components are different, wherein the circumferential petal number refers to the number of times the electromagnetic force wave is repeated within the circumference of the preset position.

[0012] Optionally, applying the multiple force wave load components to the structural model of the generator stator to obtain the vibration response of the generator stator includes:

[0013] Based on the waveform parameters of each of the force wave load components, determining at least one first force wave load component whose waveform parameters are greater than a preset parameter threshold; wherein the waveform parameters include the amplitude and / or frequency of the force wave load component,

[0014] The at least one first force wave load component is applied to the structural model of the generator stator to obtain a vibration response of the generator stator.

[0015] Optionally, applying the at least one first force wave load component to the structural model of the generator stator to obtain a vibration response of the generator stator includes:

[0016] determining at least one target force wave load component applied within a preset time period based on each of the first force wave load components, so as to determine a first vibration response of each node in the structural model within the preset time period based on the target force wave load component;

[0017] Obtaining a periodic second vibration response of the node based on a target load value in a target force wave load component required to be applied to each node;

[0018] A vibration response of the generator stator is obtained according to the first vibration response and the second vibration response.

[0019] Optionally, determining at least one target force wave load component applied within a preset time period based on each of the first force wave load components includes:

[0020] Determining a target number of circumferential petals for each component in the structural model based on the structural model of the generator stator;

[0021] determining at least one target force wave load component corresponding to a target number of circumferential petals of each of the components from the plurality of first force wave load components;

[0022] Within a preset time period, the at least one target force wave load component is applied to a component corresponding to the structural model to obtain a vibration response of the generator stator.

[0023] Optionally, the method further includes:

[0024] Establishing a finite element model of the generator stator based on geometric parameters of the generator stator;

[0025] Meshing the finite element model to obtain a first mesh of a plurality of components of the generator stator and a plurality of first nodes on the first mesh;

[0026] encrypting a first mesh of a target component among the multiple components to obtain a second mesh of the target component and a plurality of second nodes on the second mesh;

[0027] A structural model of the generator stator is obtained based on the plurality of first nodes and the plurality of second nodes.

[0028] Optionally, the vibration response of the generator stator includes at least one of displacement, velocity, and acceleration of multiple nodes in the structural model.

[0029] According to a second aspect of the present application, an embodiment of the present application further provides a vibration analysis device for a generator stator, the device comprising:

[0030] An electromagnetic module, configured to determine the electromagnetic force of the generator stator based on a structural model of the generator stator;

[0031] a decomposition module, configured to decompose the electromagnetic force of the generator stator to obtain a plurality of force wave load components; the force wave load components include a plurality of load values distributed along the circumferential direction of the generator stator;

[0032] A response module is used to apply the multiple force wave load components to the structural model of the generator stator to obtain the vibration response of the generator stator.

[0033] According to the third aspect of the present application, an embodiment of the present application also provides a computer-readable storage medium on which a computer program is stored, and the computer-readable storage medium stores instructions, which, when executed by a computer, enable the computer to implement any one of the vibration analysis methods for the generator stator provided in the embodiments of the present application.

[0034] According to a fourth aspect of the present application, an embodiment of the present application further provides an electronic device, including:

[0035] a memory having a computer program stored thereon;

[0036] A processor is used to execute the computer program in the memory to implement any one of the vibration analysis methods for the generator stator provided in the embodiments of the present application.

[0037] Some embodiments of the present specification include at least the following beneficial effects: through data processing, the electromagnetic analysis result data is converted into multiple circumferential petal numbers of force wave load components, and the multiple force wave load components have different frequencies and amplitudes. The multiple force waves are superimposed to simulate the rotation effect of the force waves in the actual operation process, and generate accurate loads for transient analysis, which can make the load input of the vibration analysis more accurate, and thus make the calculation results can truly reflect the dynamic response of the iron core distributed over time and space, and the analysis results are closer to the measured results and more reliable.

[0038] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0040] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.

[0041] Figure 1 is an application scenario diagram of the vibration analysis method of the generator stator according to some embodiments of this specification;

[0042] Figure 2 is an exemplary flow chart of a vibration analysis method for a generator stator according to some embodiments of this specification;

[0043] Figure 3 is an exemplary schematic diagram of superimposed force wave loads according to some embodiments of this specification;

[0044] Figure 4 is an exemplary schematic diagram showing a circumferential petal number of 2 according to some embodiments of this specification;

[0045] Figure 5 is an exemplary schematic diagram showing a circumferential petal number of 4 according to some embodiments of this specification;

[0046] Figure 6 is an exemplary schematic diagram of a structural model of a generator stator according to some embodiments of this specification;

[0047] Figure 7 is an exemplary schematic diagram of a displacement time history of a node according to some embodiments of this specification;

[0048] Figure 8 is an exemplary schematic diagram of a dynamic response spectrum of a node according to some embodiments of this specification;

[0049] Figure 9 is a schematic structural diagram of a vibration analysis device for a generator stator according to some embodiments of this specification;

[0050] Figure 10 This is a structural diagram of an electronic device according to some embodiments of this specification. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only 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 those skilled in the art without creative work are within the scope of protection of the present application.

[0052] In order to facilitate understanding of the implementation scheme provided in the embodiment of the present application, the relevant application background of the vibration analysis method of the generator stator provided in the embodiment of the present application is first explained.

[0053] Currently, traditional methods for analyzing the electromagnetic vibration of a hydro-generator's stator core rely on steady-state harmonic response analysis, which applies simple harmonic excitation with a single amplitude and frequency, or with a single amplitude and varying frequencies, to determine the vibration response. However, when the outer side of the motor's stator core is connected to the base via dovetail bars, the structure and electromagnetic force distribution are relatively complex. Electromagnetic force is not a simple static force, but rather manifests as a spatial rotating force wave that varies with time and space. The electromagnetic force function is affected not only by time but also by spatial position. Steady-state harmonic response analysis, which treats the electromagnetic force as a constant value applied to the stator core, ignores the rotational characteristics of the force wave and the effects of multiple force waves superimposed. This method fails to accurately reflect the specific impact of the electromagnetic force wave on the motor structure, resulting in significant deviations from actual results and difficulty meeting the requirements of high-precision, high-performance motor design.

[0054] In view of this, some embodiments of the present specification provide a vibration analysis method for a generator stator, which obtains multiple force wave load components with different frequencies and amplitudes by decomposition, and superimposes multiple force wave load components to simulate the rotation effect of the force wave during actual operation, which helps to reflect the dynamic response of the iron core with time and space distribution, so that the analysis results are closer to the actual measured results and more reliable.

[0055] Figure 1 This is an application scenario diagram of the vibration analysis method of the generator stator shown in some embodiments of this specification.

[0056] Some embodiments of this specification can be applied to various fields such as the design, manufacture, and maintenance of generator stators. For example, by designing and optimizing the generator stator through the system and method of this application, it can be ensured that the generator stator has higher safety and reliability during use.

[0057] like Figure 1 As shown, the application scenario of the vibration analysis method of the generator stator may include terminal equipment.

[0058] The terminal device is used to process information and / or data from other components or external data sources (e.g., cloud data centers). The terminal device can execute program instructions based on this data, information, and / or processing results to perform one or more functions described in this application. For example, the terminal device can obtain data uploaded by the terminal (e.g., information about the generator stator).

[0059] In some embodiments, the terminal device may include one or more sub-processing devices (e.g., a single-chip processing device or a multi-chip processing device). By way of example only, the terminal device may include a central processing unit (CPU), an application-specific integrated circuit (ASIC), a graphics processing unit (GPU), a digital signal terminal device (DSP), a field-programmable gate array (FPGA), a micro terminal device, or any combination thereof.

[0060] In some embodiments, the terminal device can be connected to a network to communicate with other components (e.g., a user terminal, a storage device). In some embodiments, the terminal device can be integrated or included in other components (e.g., a user terminal). For example, the terminal device can be a computing device installed in the user terminal.

[0061] In some embodiments, the terminal device is responsible for real-time control and management of the entire generator stator production process. In some embodiments, the terminal device may also include a storage device for storing data, instructions, and / or any other information. For example, the storage device may store stator core design parameters such as air gap size, core thickness, winding layout, etc.

[0062] It is worth noting that the application scenario of the generator stator vibration analysis method is provided for illustrative purposes only and is not intended to limit the scope of this specification. Those skilled in the art will appreciate that various variations and modifications can be made based on the description of this specification. For example, the application scenario may also include databases, information sources, and the like. For another example, the application scenario may be implemented on other devices to achieve similar or different functions. However, such variations and modifications do not deviate from the scope of this specification.

[0063] Figure 2 is an exemplary flow chart of a vibration analysis method for a generator stator according to some embodiments of this specification. In some embodiments, process 200 can be executed based on a terminal device. Figure 2 As shown, the process 200 includes the following steps.

[0064] Step 210 : determining the electromagnetic force of the generator stator based on the structural model of the generator stator.

[0065] The structural model of the generator stator refers to the mathematical description and modeling of the geometric shape, size, material properties and connection relationship between the various components of the generator stator.

[0066] In some embodiments, the structural model of the generator stator may be composed of components such as an iron core, a winding, a frame, and an insulating material.

[0067] In some embodiments, an electromagnetic field model of the stator winding and core can be established based on Maxwell's equations and electromagnetic field theory, and an analytical method can be used to calculate the electromagnetic force density. For example, a preset formula can be used to calculate the electromagnetic force density distribution of the current in the generator stator in the magnetic field.

[0068] In some embodiments, a finite element method (such as ANSYS, Maxwell, etc.) may be used to perform electromagnetic field simulation and calculate the electromagnetic force density distribution.

[0069] Finite element analysis (FEA) is a method used to perform computer simulations of generator stators or other structures, yielding a series of data and conclusions. For example, FEA results can include the generator stator's stress distribution and vibration response. Stress distribution reflects the magnitude of stress generated by various components of the generator stator.

[0070] In some embodiments, the generator stator electromagnetic analysis can be performed. Based on Maxwell stress tensor theory, the electromagnetic force density per unit area can be calculated using the equivalent area magnetic tension. For example, the radial component of the radial electromagnetic force density is where σ r is the radial electromagnetic force density, B r is the radial magnetic flux density, B tis the circumferential magnetic flux density, μ0 is the air magnetic permeability.

[0071] In some embodiments, the radial electromagnetic force at a specific position along the circumference of the air gap can be determined as F r，node =∫ S，node σ r ds, where F r，node It refers to the radial electromagnetic force at a specific location (e.g., radius r).

[0072] Step 220 , decomposing the electromagnetic force of the generator stator to obtain a plurality of force wave load components; the force wave load components include a plurality of load values distributed along the circumferential direction of the generator stator.

[0073] Force wave load components refer to the multiple force wave components with different frequencies and spatial distributions obtained by decomposing the electromagnetic force. Each force wave load component corresponds to a specific frequency and spatial distribution pattern.

[0074] The load value is the magnitude of the force wave load component at a specific location or frequency. The load value is a measure of the specific value of the electromagnetic force at a specific point and frequency.

[0075] In some embodiments, multiple load values of the force wave load component may be distributed along the circumferential direction of the stator to form a force wave distribution diagram.

[0076] In some embodiments, the electromagnetic force contains multiple frequency components, such as the fundamental frequency, frequency harmonic components (such as double frequency, quadruple frequency, etc.) and harmonic components caused by asymmetric load or winding defects. The electromagnetic force can be decomposed into multiple force wave load components by mathematical methods (such as Fourier decomposition), and each force wave load component corresponds to a specific frequency and / or amplitude.

[0077] In some embodiments, based on the radial electromagnetic force at a specific position along the circumferential direction of the air gap, the radial electromagnetic force can be decomposed into multiple force wave load components by mathematical methods (such as Fourier decomposition).

[0078] Step 230: Apply multiple force wave load components to the structural model of the generator stator to obtain the vibration response of the generator stator.

[0079] The vibration response of a generator stator refers to the dynamic reaction of its components to external excitation (e.g., electromagnetic or mechanical forces). This includes changes in physical quantities such as displacement, velocity, acceleration, stress, and strain of the stator core, windings, and frame.

[0080] Displacement response refers to the displacement change of each generator stator component relative to its static position during vibration. Velocity response refers to the velocity change of each generator stator component during vibration. Acceleration response refers to the acceleration change of each generator stator component during vibration. Stress response refers to the stress change generated by each generator stator component during vibration.

[0081] In some embodiments, each of the multiple force wave load components may be applied to a structural model of the generator stator to obtain a vibration response of the generator stator.

[0082] In some embodiments, preset force wave load components among the multiple force wave load components may be applied to the structural model of the generator stator separately or in a superimposed manner to obtain a vibration response of the generator stator.

[0083] The preset force wave load component may be a force wave load component that satisfies a preset condition. For example, the preset force wave load may be a low-order force wave load component, a force wave load component of a circumferential petal number with an amplitude exceeding 80% of the total energy.

[0084] In some embodiments, multiple force wave load components may be superimposed, and the superimposed force wave load may be applied to a structural model of the generator stator to obtain a vibration response of the generator stator.

[0085] For example, multiple force wave load components, a single force wave load component is Where A is the amplitude of the force wave load component, ω is the frequency of the force wave load component, is the phase of the force wave load component. Multiple force wave load components are superimposed to obtain the superimposed force wave load u, such as n is the number of decomposed force wave load components.

[0086] Figure 3 is an exemplary schematic diagram of the superimposed force wave load according to some embodiments of this specification. In some embodiments, as Figure 3 The figure shows the result of superimposing the wave load components with 4 and 8 circular petals.

[0087] In some embodiments of this specification, by decomposing the electromagnetic force into multiple force wave load components and considering their distribution along the circumferential direction, the dynamic behavior of the generator stator in actual operation can be simulated more accurately, which helps to consider the rotational effect of the force wave and obtain a more accurate vibration response of the generator stator.

[0088] In some embodiments, the electromagnetic force is a radial electromagnetic force of the generator stator at a preset position.

[0089] Based on the decomposition of the electromagnetic force of the generator stator, multiple force wave load components are obtained, including:

[0090] Based on the radial electromagnetic force, harmonic analysis is performed along the circumferential direction of the preset position to obtain multiple force wave load components corresponding to different circumferential petal numbers. The frequencies and amplitudes of the multiple force wave load components are different. Among them, the circumferential petal number refers to the number of times the electromagnetic force wave is repeated within the circumference of the preset position.

[0091] The radial electromagnetic force is the electromagnetic force perpendicular to the air gap surface during the operation of the generator stator.

[0092] A preset location is a pre-selected area within the generator stator geometry for analyzing vibration responses. The preset location may include, but is not limited to, the stator air gap, winding ends, core slots, and other locations.

[0093] In some embodiments, a preset cross-section of the stator (e.g., the cross-section at the air gap) can be selected as a preset position. At the preset cross-section, the radial electromagnetic force along the circumferential direction is determined, and the radial electromagnetic force is decomposed into multiple force wave load components using Fourier transform (FFT) or other harmonic analysis methods.

[0094] The air gap is the space between the generator's stator and rotor, where electromagnetic forces primarily act. Analyzing a specific cross-section of the air gap reveals the distribution of electromagnetic forces.

[0095] Figure 4 This is an exemplary schematic diagram showing a circumferential petal number of 2 according to some embodiments of this specification.

[0096] For example, a force wave load component with a circumferential petal number of 2 indicates that the force wave corresponding to the force wave load component is repeated twice in the circumferential direction of the preset position.

[0097] Figure 5 This is an exemplary schematic diagram showing that the number of circumferential petals is 4 according to some embodiments of this specification.

[0098] For example, a force wave load component with a circumferential petal number of 4 indicates that the force wave corresponding to the force wave load component is repeated 4 times in the circumferential direction of the preset position.

[0099] In some embodiments of this specification, by decomposing the radial electromagnetic force into multiple force wave load components, the distribution characteristics of the electromagnetic force in the circumferential direction can be more accurately described. Through multiple force wave load functions in the circumferential direction, the rotation effect of the force wave is realized, which helps to more accurately predict the vibration response of the stator.

[0100] In some embodiments, applying multiple force wave load components to a structural model of a generator stator to obtain a vibration response of the generator stator includes:

[0101] Based on the waveform parameters of each force wave load component, at least one first force wave load component having a waveform parameter greater than a preset parameter threshold is determined; wherein the waveform parameters include the amplitude and / or frequency of the force wave load component,

[0102] At least one first force wave load component is applied to the structural model of the generator stator to obtain a vibration response of the generator stator.

[0103] Waveform parameters are parameters that describe the characteristics of the force wave load components.

[0104] Amplitude refers to the maximum value of the load component of the force wave and indicates the strength of the force.

[0105] Frequency refers to the repetition frequency of the load component of the force wave, which indicates the number of times the force wave is repeated per unit time.

[0106] Preset parameter thresholds are pre-set threshold conditions used to screen force wave load components. When the waveform parameters (amplitude or frequency) of a force wave load component exceed the preset parameter thresholds, the force wave load component significantly affects the vibration response. Preset amplitude and frequency thresholds can be set based on design requirements or experience.

[0107] In some embodiments, the waveform parameters of all force wave load components can be compared with preset parameter thresholds to screen out force wave load components with amplitudes and / or frequencies greater than the corresponding preset parameter thresholds as first force wave load components.

[0108] In some embodiments, the screened multiple first force wave load components can be applied to the structural model of the generator stator through finite element analysis software (such as ANSYS Workbench, etc.) to perform transient response analysis and calculate the vibration response of the stator under the multiple first force wave load components, including displacement, stress, and strain.

[0109] For example, only when the amplitude of a certain force wave load component exceeds a preset amplitude threshold, or the frequency of a certain force wave load component is close to the natural frequency of the generator stator structure, it is determined as the first force wave load component, which helps to more accurately predict and control vibration problems that may occur during motor operation.

[0110] In some embodiments of the present specification, accurately identifying and analyzing force wave load components that significantly affect the vibration response of the generator stator helps optimize the generator design, reduce vibration and noise, and improve operational reliability.

[0111] In some embodiments, applying at least one first force wave load component to a structural model of a generator stator to obtain a vibration response of the generator stator includes:

[0112] determining at least one target force wave load component applied within a preset time period based on each first force wave load component, so as to determine a first vibration response of each node in the structural model within the preset time period based on the target force wave load component;

[0113] Based on the target load value in the target force wave load component required to be applied to each node, a periodic second vibration response of the node is obtained;

[0114] The vibration response of the generator stator is obtained according to the first vibration response and the second vibration response.

[0115] The preset time period is the time range used for analysis. The preset time period is related to the time step (time interval). For example, in a transient response analysis, the preset time period is from 0 to 1 second, with a time step of 0.01 seconds.

[0116] The target force wave load component is a force wave component selected from the first force wave load component and used for performing vibration analysis within a preset time period.

[0117] The first vibration response refers to the vibration response of the generator stator obtained by numerical simulation (such as finite element analysis) after the target force wave load component is applied to the structural model of the generator stator at the same time step within a preset time period.

[0118] The second vibration response refers to a periodic vibration response of a certain node obtained by applying a target load value in a target force wave load component to a certain node within a preset time period.

[0119] In some embodiments, the preset time period includes multiple time steps, the target force wave load component is a sine wave or a cosine wave, and the multiple target force wave load components are superimposed to obtain a total force wave load. Based on the total force wave load and the position of each node in the circumferential direction, the target load value of each node at different time steps is obtained.

[0120] In some embodiments, the force wave load component is a sine wave distributed along the circumferential direction of the generator stator, and the total force wave load is a functional load obtained by superimposing multiple electromagnetic waves, and the shape is multiple sine waves distributed along the circumference.

[0121] In some embodiments, for a preset time step, based on the target load value of each node, the load is applied to the corresponding nodes respectively through finite element analysis software (such as ANSYS Workbench, etc.) to obtain the vibration response of multiple nodes of the generator stator at the preset time step.

[0122] The preset time step may be any time step within the preset time period.

[0123] In some embodiments, the above method can be used to obtain first vibration responses of multiple nodes of the generator stator at a preset time step.

[0124] The target node can be any node.

[0125] In some embodiments, for multiple preset time periods, a target load sequence of the target node is determined based on multiple target force wave load components and the position of the target node in the circumferential direction. The target load sequence includes the target load value of the target node at each time step within the preset time period.

[0126] Each target load value in the target load sequence is periodically applied to the target node in sequence to obtain a periodic second vibration response of the target node.

[0127] For example, a program for applying target force wave load values to the iron core for transient analysis is written in APDL assembly language, and electromagnetics and structures are coupled to complete transient dynamic response analysis. For example, for the nodes on the inner surface of the iron core, the written program is applied to the nodes of the component. The node application process is implemented through two loops. The inner loop is a spatial loop, which analyzes the different target force wave load values of different nodes at each moment, in the form of multiple sine waves distributed along the circumference. The outer loop is a time loop, which analyzes the different target force wave load values of the same node at different moments, and realizes the rotation effect of the force wave by superposition of multiple force waves. For example, by applying it by inserting commands in ANSYS Workbench, the combination of ANSYS Workbench and APDL language can be realized more conveniently, the respective advantages of Workbench and ANSYS can be reflected, and the calculation results are more intuitive.

[0128] In some embodiments of this specification, the first vibration response and the second vibration response are combined to obtain the overall vibration response of the generator stator, which can accurately analyze the vibration characteristics of the generator stator under complex loads, and help to subsequently optimize the design of the generator electronics and reduce vibration and noise.

[0129] In some embodiments, determining at least one target force wave load component applied within a predetermined time period based on each first force wave load component includes:

[0130] Based on the structural model of the generator stator, determine the target number of circumferential petals for each component in the structural model;

[0131] Determining at least one target force wave load component corresponding to a target number of circumferential petals of each component from the plurality of first force wave load components;

[0132] Within a preset time period, at least one target force wave load component is applied to a corresponding component of the structural model to obtain a vibration response of the generator stator.

[0133] Different components of the generator stator (such as the stator core, stator winding, slot wedges, etc.) have different geometric structures and electromagnetic characteristics, and different components correspond to different target circumferential petal numbers.

[0134] In some embodiments, all components of the generator stator correspond to the same one or more circumferentially divided force wave load components.

[0135] In some embodiments, different components of the generator stator correspond to force wave load components with different circumferential petal numbers. For example, node 1 corresponds to force wave load components with circumferential petal numbers of 2 and 4, and node 2 corresponds to force wave load components with circumferential petal numbers of 4 and 6.

[0136] In some embodiments, modal analysis can be performed to determine the natural frequency and mode shape of each component, thereby obtaining the number of circumferential petals corresponding to each component. A mode shape is a spatial distribution diagram that describes the relative displacement of each point on a component at a certain natural frequency.

[0137] In some embodiments, the target number of circumferential petals of each component can be obtained based on the component characteristics of each component through a preset model.

[0138] Component features are used to describe the characteristics of a component. For example, component features may include parameters such as the component's natural frequency, geometric shape, and mode shape.

[0139] In some embodiments, the preset model is a machine learning model. For example, the preset model may include any one or combination of a convolutional neural network (CNN) model, a neural network (NN) model, or other customized model structures.

[0140] In some embodiments, the input of the preset model includes component features, and the output may include a target number of circumferential petals corresponding to the component.

[0141] In some embodiments, the preset model can be trained based on a large number of labeled training samples through various feasible methods. For example, parameter updates can be performed based on the gradient descent method. An exemplary training process includes: inputting multiple labeled training samples into the initial preset model, constructing a loss function based on the labels and the results of the initial preset model, and iteratively updating the parameters of the initial preset model based on the loss function through gradient descent or other methods. When the preset conditions are met, the model training is completed, and a trained preset model is obtained. The preset conditions may include convergence of the loss function, the number of iterations reaching a threshold, etc.

[0142] In some embodiments, the training sample includes at least sample component features. The training sample can be obtained based on historical data.

[0143] In some embodiments, the label may include the number of sample circumference petals corresponding to the training sample. The label may be obtained through automatic or manual annotation.

[0144] In some embodiments of this specification, by applying the target force wave load component to the corresponding component and performing transient response analysis, the vibration response of the stator within a preset time period is obtained, and the dynamic behavior of the generator stator under the action of the most influential target force wave load component can be accurately analyzed.

[0145] In some embodiments, the method further comprises:

[0146] Based on the geometric parameters of the generator stator, a finite element model of the generator stator is established;

[0147] Meshing the finite element model to obtain a first mesh of a plurality of components of the generator stator and a plurality of first nodes on the first mesh;

[0148] encrypting a first mesh of a target component among the multiple components to obtain a second mesh of the target component and a plurality of second nodes on the second mesh;

[0149] A structural model of the generator stator is obtained based on the plurality of first nodes and the plurality of second nodes.

[0150] Finite element models are numerical calculation models used to simulate and analyze the mechanical behavior of the actual structure of a generator stator. For example, a finite element model is a tool for digitally simulating parameters such as the generator stator's geometry, material properties, constraints, and load distribution.

[0151] In some embodiments, a finite element model of the generator stator can be established based on finite element analysis software, including but not limited to ANSYS, ABAQUS, etc.

[0152] In some embodiments, a geometric model of the generator stator can be created; the geometric model can be divided (e.g., meshing, etc.) to obtain a finite number of units, which can be one-dimensional (e.g., rods), two-dimensional (e.g., shell elements), or three-dimensional (e.g., solid elements); material properties are assigned to each unit, such as elastic modulus, Poisson's ratio, thermal conductivity, tensile strength, etc.; boundary conditions and load application: boundary conditions of the geometric model (e.g., fixed end, free end, periodicity, etc.) and loads acting on the collective model (e.g., force, pressure, temperature change, etc.) are obtained to simulate the interaction between the generator stator and the surrounding environment in actual application scenarios, and to determine the finite element model of the generator stator.

[0153] Figure 6 is an exemplary schematic diagram of a structural model of a generator stator according to some embodiments of this specification.

[0154] In some embodiments, a three-dimensional geometric model of the generator stator can be established, including the base, core and connecting parts (the established three-dimensional geometric model is as follows: Figure 6 As shown in the figure, the mesh of key areas such as the core is densified.

[0155] It's important to note that in structural analysis software such as ANSYS Workbench, the contact relationships, mesh, and boundary conditions of the geometric model must be determined. The inner surface of the core must be meshed and components defined to facilitate APDL load application. Components can be bodies, surfaces, lines, elements, and so on. Defining components facilitates subsequent loading. A mesh is called an element, and the vertices on an element are called nodes.

[0156] In some embodiments, the geometric model may be divided based on initial parameters to obtain a plurality of first meshes. The initial parameters may be initially determined parameters for dividing the meshes, for example, the initial parameters may include the size of the mesh, the shape of the mesh, etc.

[0157] The first mesh is the result of the initial mesh division, which is used for preliminary analysis. The mesh shape of the first mesh includes tetrahedron, hexahedron, quadrilateral, triangle, etc.

[0158] The first node can be a vertex on the first mesh and is the basic point for calculation and solution in finite element analysis. Each node has its own coordinates and degrees of freedom (such as displacement, velocity, acceleration, etc.).

[0159] In some embodiments, the mesh density of the target component may be adjusted based on the mesh adjustment parameter to obtain a second mesh of the target component and a plurality of second nodes on the second mesh.

[0160] The second grid is a grid obtained by encrypting the first grid. The first grid and the second grid are at least partially different in shape, size, density, etc.

[0161] Mesh adjustment parameters refer to the parameter values used to adjust the mesh parameters used when meshing the finite element model. Mesh parameters can include the number of meshes and the size of the meshes.

[0162] In some embodiments, a corresponding grid adjustment parameter may be generated based on the response deviation being greater than a preset deviation threshold. Different response deviations correspond to different grid adjustment parameters. For example, a higher response deviation corresponds to a higher grid adjustment parameter.

[0163] Response deviation refers to the deviation between the vibration response of the target component and the preset vibration response.

[0164] The preset vibration response may be determined based on experiments or experience.

[0165] In some embodiments, the size of the first grid of the target component may be adjusted based on the grid adjustment parameter, and the finite element model of the generator stator may be divided based on the size of the second grid using a finite element analysis method in a manner similar to the above.

[0166] In some embodiments of this specification, the encrypted second grid contains more units and nodes, which can more accurately describe the dynamic behavior of the winding end. After encryption processing, a structural model containing detailed grid and node information of all components is obtained, which can be used for transient response analysis, etc. to evaluate the dynamic behavior of the stator, which helps to improve the accuracy and reliability of vibration analysis.

[0167] In some embodiments, the vibration response of the generator stator includes at least one of displacement, velocity, and acceleration of a plurality of nodes in the structural model.

[0168] In some embodiments, through transient response analysis, the response of each node on the core can be calculated, including the results of displacement, velocity, acceleration, etc. changing with time. Figure 7 As shown; the dynamic response spectrum of a point in the core is as follows Figure 8 shown.

[0169] Figure 7 is an exemplary schematic diagram of the displacement time history of a node according to some embodiments of this specification.

[0170] In some embodiments, the displacement time history of a node of the generator stator is as follows: Figure 7 The horizontal axis represents time (in seconds, s) and the vertical axis represents the displacement value of the node (in millimeters, mm). Figure 7The curve in shows the periodic change of the displacement of the node over time. The waveform has some irregular fluctuations in the initial stage and then gradually tends to stable periodic fluctuations.

[0171] Figure 8 is an exemplary schematic diagram of a dynamic response spectrum of a node according to some embodiments of this specification.

[0172] In some embodiments, the spectrum response of a node of the generator stator is as follows: Figure 8 As shown in the figure, the amplitude is different at different frequencies. The horizontal axis represents the frequency (in Hertz, Hz), and the vertical axis represents the amplitude (in millimeters, mm). Figure 8 As shown, there is a large peak at 100 Hz, indicating that the amplitude is the largest at 100 Hz, and the amplitudes of other frequencies are relatively small. This can be used to analyze the frequency characteristics of vibrations, sound waves, or other periodic signals.

[0173] It should be noted that the above description of the relevant processes is for illustration and purpose only and does not limit the scope of application of this specification. For those skilled in the art, various modifications and changes can be made to the processes under the guidance of this specification. However, such modifications and changes are still within the scope of this specification.

[0174] Figure 9 It is a structural schematic diagram of a vibration analysis device for a generator stator according to some embodiments of this specification.

[0175] like Figure 9 As shown, one or more embodiments of this specification also provide a schematic structural diagram of a vibration analysis device for a generator stator. The vibration analysis device for a generator stator may include:

[0176] The electromagnetic module 901 is used to determine the electromagnetic force of the generator stator based on the structural model of the generator stator;

[0177] A decomposition module 902 is configured to decompose the electromagnetic force of the generator stator to obtain a plurality of force wave load components; the force wave load components include a plurality of load values distributed along the circumferential direction of the generator stator;

[0178] The response module 903 is used to apply multiple force wave load components to the structural model of the generator stator to obtain the vibration response of the generator stator.

[0179] Among them, the electromagnetic module 901, the decomposition module 902, and the response module 903 can be used to respectively execute the corresponding embodiments of the above-mentioned generator stator vibration analysis method. For the specific implementation methods of these modules and more details, please refer to the corresponding method parts, which will not be repeated here.

[0180] The specific implementation of the above operations can be found in the previous embodiments and will not be repeated here.

[0181] Figure 10 This is a structural diagram of an electronic device according to some embodiments of this specification.

[0182] The embodiment of the present application also provides an electronic device 1000, which may include one or more processors 1001 of processing cores, one or more computer-readable storage media memories 1002, a power supply 1003, an input unit 1004 and other components. Those skilled in the art will understand that Figure 10 The electronic device structure shown in the figure does not constitute a limitation of the electronic device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange components differently.

[0183] Processor 1001 is the vibration analysis center of the generator stator. It utilizes various interfaces and circuits to connect the various components of the entire electronic device. By running or executing software programs and / or modules stored in memory 1002 and accessing data stored in memory 1002, it performs various functions of the electronic device and processes data, thereby providing overall monitoring of the electronic device. It will be understood that processor 1001 communicates with the controller through signal transmission. Optionally, processor 1001 may include one or more processing cores. Preferably, processor 1001 may integrate an application processor and a modem processor, wherein the application processor primarily handles the operating system, user interface, and application programs, while the modem processor primarily handles wireless communications. It will be understood that the modem processor may not be integrated into processor 1001.

[0184] The memory 1002 can be used to store software programs and modules. The processor 1001 executes various functional applications and data processing by running the software programs and modules stored in the memory 1002. The memory 1002 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area may store data created according to the use of the electronic device, etc. In addition, the memory 1002 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage device. Accordingly, the memory 1002 may also include a memory controller to provide the processor 1001 with access to the memory 1002.

[0185] In some embodiments of the present application, the vibration analysis device of the generator stator can be implemented in the form of a computer program. The computer program can be used in Figure 10The electronic device is operated on the electronic device shown. The memory of the electronic device may store the various program modules that constitute the vibration analysis device for the generator stator. The computer program composed of the various program modules causes the processor to execute the steps of the vibration analysis method for the generator stator of each embodiment of the present application described in this specification.

[0186] The electronic device includes a processor, memory, and a network interface connected via a system bus. The processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operating system and computer program in the non-volatile storage medium to run. The network interface of the electronic device is used to communicate with external electronic devices via a network connection. When executed by the processor, the computer program implements a vibration analysis method for a generator stator.

[0187] The electronic device also includes a power supply 1003 for supplying power to various components. Preferably, the power supply 1003 can be logically connected to the processor 1001 via a power management system, thereby enabling the power management system to manage charging, discharging, and power consumption. The power supply 1003 can also include one or more DC or AC power supplies, a recharging system, a power failure detection circuit, a power converter or inverter, a power status indicator, and other arbitrary components.

[0188] The electronic device may further include an input unit 1004, which may be configured to receive input digital or character information and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.

[0189] Although not shown, the electronic device may further include a display unit, etc., which will not be described in detail here. Specifically, in this embodiment, the processor 1001 in the electronic device loads executable files corresponding to one or more application processes into the memory 1002 according to computer instructions. The processor 1001 then runs the application stored in the memory 1002 to implement various functions, such as the generator stator vibration analysis method described in various embodiments of the present application in this specification.

[0190] Those skilled in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be accomplished by instructions, or by controlling related hardware through instructions. The instructions may be stored in a computer-readable storage medium and loaded and executed by a processor.

[0191] In specific implementation, the above units or structures can be implemented as independent entities, or can be arbitrarily combined to implement as the same or several entities. The specific implementation of the above units or structures can refer to the previous method embodiments and will not be repeated here.

[0192] It should be noted that Figure 10 This is only one implementation of the electronic device 1000 provided in the embodiment of the present application. In actual applications, the electronic device 1000 may also include more or fewer components, which is not limited here.

[0193] It should be understood that the various schemes of the embodiments of the present application can be reasonably combined and used, and the explanations or descriptions of the various terms appearing in the embodiments can be referenced or explained with each other in the various embodiments, without limitation to this.

[0194] It should also be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0195] Based on the above embodiments and the same concept, an embodiment of the present application further provides a computer-readable storage medium, which stores a computer program. When the computer program runs on a computer, the computer executes the method provided in the above embodiments.

[0196] Based on the above embodiments and the same concept, an embodiment of the present application further provides a computer program product, which includes a computer program or instructions. When the computer program or instructions are run on a computer, the computer executes the method provided in the above embodiments.

[0197] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0198] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0199] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. Although the descriptions of each embodiment in the embodiments of the present application have different focuses, for parts that are not described in detail in a certain embodiment, please refer to the relevant embodiments of other embodiments. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A vibration analysis method for a generator stator, characterized in that: The method comprises: determining the electromagnetic force of the generator stator based on a structural model of the generator stator; Decomposing the electromagnetic force of the generator stator to obtain a plurality of force wave load components; the force wave load components include a plurality of load values distributed along the circumferential direction of the generator stator; The multiple force wave load components are applied to the structural model of the generator stator to obtain the vibration response of the generator stator.

2. The method according to claim 1, characterized in that The electromagnetic force is the radial electromagnetic force of the generator stator at a preset position. The electromagnetic force based on the generator stator is decomposed to obtain multiple force wave load components, including: Based on the radial electromagnetic force, harmonic analysis is performed along the circumferential direction of the preset position to obtain multiple force wave load components corresponding to different circumferential petal numbers. The frequencies and amplitudes of the multiple force wave load components are different, wherein the circumferential petal number refers to the number of times the electromagnetic force wave is repeated within the circumference of the preset position.

3. The method according to claim 2, characterized in that Applying the multiple force wave load components to the structural model of the generator stator to obtain the vibration response of the generator stator includes: Based on the waveform parameters of each of the force wave load components, determining at least one first force wave load component whose waveform parameters are greater than a preset parameter threshold; wherein the waveform parameters include the amplitude and / or frequency of the force wave load component, The at least one first force wave load component is applied to the structural model of the generator stator to obtain a vibration response of the generator stator.

4. The method according to claim 3, characterized in that Applying the at least one first force wave load component to the structural model of the generator stator to obtain a vibration response of the generator stator includes: determining at least one target force wave load component applied within a preset time period based on each of the first force wave load components, so as to determine a first vibration response of each node in the structural model within the preset time period based on the target force wave load component; Obtaining a periodic second vibration response of the node based on a target load value in a target force wave load component required to be applied to each node; A vibration response of the generator stator is obtained according to the first vibration response and the second vibration response.

5. The method according to claim 4, characterized in that The determining, based on each of the first force wave load components, at least one target force wave load component applied within a preset time period comprises: Determining a target number of circumferential petals for each component in the structural model based on the structural model of the generator stator; determining at least one target force wave load component corresponding to a target number of circumferential petals of each of the components from the plurality of first force wave load components; Within a preset time period, the at least one target force wave load component is applied to a component corresponding to the structural model to obtain a vibration response of the generator stator.

6. The method according to claim 4, characterized in that The method further comprises: Establishing a finite element model of the generator stator based on geometric parameters of the generator stator; Meshing the finite element model to obtain a first mesh of a plurality of components of the generator stator and a plurality of first nodes on the first mesh; encrypting a first mesh of a target component among the multiple components to obtain a second mesh of the target component and a plurality of second nodes on the second mesh; A structural model of the generator stator is obtained based on the plurality of first nodes and the plurality of second nodes.

7. The method according to claim 1, characterized in that The vibration response of the generator stator includes at least one of displacement, velocity, and acceleration of a plurality of nodes in the structural model.

8. A vibration analysis device for a generator stator, characterized in that: The device comprises: An electromagnetic module, configured to determine the electromagnetic force of the generator stator based on a structural model of the generator stator; a decomposition module, configured to decompose the electromagnetic force of the generator stator to obtain a plurality of force wave load components; the force wave load components include a plurality of load values distributed along the circumferential direction of the generator stator; A response module is used to apply the multiple force wave load components to the structural model of the generator stator to obtain the vibration response of the generator stator.

9. An electronic device, characterized in that: include: a memory having a computer program stored thereon; A processor, configured to execute the computer program in the memory to implement the steps of the method according to any one of claims 1 to 7.

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 steps of the method according to any one of claims 1 to 7 are implemented.

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