Pump impeller fatigue analysis method and device, storage medium and electronic equipment

Abstract

The invention relates to a pump impeller fatigue analysis method and device, a storage medium and electronic equipment, in particular to the technical field of oil-submerged pumps, and the method comprises the steps that impeller structure data and impeller operation environment data of an impeller of an oil-submerged pump are obtained, and the impeller operation environment data comprise oil medium data; static stress analysis and harmonic response analysis are conducted on the impeller according to the impeller structure data and the impeller operation environment data, the average stress and stress amplitude of the impeller are obtained, fatigue analysis points corresponding to the impeller are determined, and the fatigue analysis points at least comprise the maximum static stress point of the impeller and the maximum dynamic stress point of the impeller; drawing a fatigue strength graph of the impeller according to the average stress and the stress amplitude of the impeller, and determining a safety coefficient corresponding to the fatigue analysis point based on the fatigue strength graph; and checking the fatigue strength of the impeller according to the safety coefficient, and generating a fatigue analysis result of the impeller running in the oil medium. According to the invention, the operation safety analysis of the impeller in the oil medium can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of submersible pumps, and particularly relates to a pump wheel fatigue analysis method and device, a storage medium and an electronic device. BACKGROUND

[0002] With the application of pump products in a wider field, the running environment thereof is a complex environment of multiple physical fields. In some important products, the working time is long, the running environment is harsh, and the product safety level is high. The submersible pump impeller (may be referred to as a pump wheel) is an important component in the product. When designing and analyzing, the structural fatigue problem of the product needs to be considered. Accurate prediction of fatigue life is an important condition for ensuring long-term safe operation of the impeller.

[0003] At present, the related art usually only performs fatigue analysis based on the geometric structure of the pump wheel, and ignores the significant influence of the running environment on the fatigue performance. SUMMARY

[0004] Therefore, the present application provides a pump wheel fatigue analysis method and device, a storage medium and an electronic device, which mainly aims to solve the technical problem that the related art usually only performs fatigue analysis based on the geometric structure of the pump wheel and ignores the significant influence of the running environment on the fatigue performance.

[0005] In a first aspect, the present application provides a pump wheel fatigue analysis method, which comprises the following steps: obtaining impeller structure data and impeller running environment data of an impeller of a submersible pump, wherein the impeller running environment data comprises oil medium data; performing static stress analysis and harmonic response analysis on the impeller according to the impeller structure data and the impeller running environment data, obtaining average stress and stress amplitude of the impeller, and determining fatigue analysis points corresponding to the impeller, wherein the fatigue analysis points at least include a maximum static stress point of the impeller and a maximum dynamic stress point of the impeller; drawing a fatigue strength diagram of the impeller according to the average stress and the stress amplitude of the impeller, and determining a safety factor corresponding to the fatigue analysis points based on the fatigue strength diagram; performing fatigue strength checking on the impeller according to the safety factor, and generating a fatigue analysis result of the impeller running in the oil medium.

[0006] In a second aspect, the present application provides a pump wheel fatigue analysis device, which comprises the following steps: The obtaining module is configured to obtain impeller structure data and impeller running environment data of an impeller of a submersible pump, wherein the impeller running environment data comprises oil medium data; perform static stress analysis and harmonic response analysis on the impeller according to the impeller structure data and the impeller running environment data, obtain average stress and stress amplitude of the impeller, and determine fatigue analysis points corresponding to the impeller, wherein the fatigue analysis points at least include a maximum static stress point of the impeller and a maximum dynamic stress point of the impeller; The determination module is configured to draw a fatigue strength diagram of the impeller based on the average stress and stress amplitude of the impeller, and determine the safety factor corresponding to the fatigue analysis point based on the fatigue strength diagram; The generation module is configured to perform fatigue strength verification on the impeller based on the safety factor and generate fatigue analysis results of the impeller operating in oil medium.

[0007] Thirdly, this application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method of the first aspect.

[0008] Fourthly, this application provides an electronic device, including a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, wherein the processor executes the computer program to implement the method of the first aspect.

[0009] Fifthly, this application provides a computer program product, including a computer program that, when executed by a processor, implements the method of the first aspect.

[0010] By employing the above technical solution, this application provides a pump impeller fatigue analysis method. Compared with existing related technologies, this application first obtains impeller structure data and impeller operating environment data of the submersible pump, including oil medium data. Then, based on the impeller structure data and impeller operating environment data, static stress analysis and harmonic response analysis are performed on the impeller to obtain the impeller's average stress and stress amplitude, and the corresponding fatigue analysis points are determined. The fatigue analysis points include at least the impeller's maximum static stress point and maximum dynamic stress point. Next, a fatigue strength diagram of the impeller is drawn based on the impeller's average stress and stress amplitude, and the safety factor corresponding to the fatigue analysis points is determined based on the fatigue strength diagram. Finally, the fatigue strength of the impeller is checked based on the safety factor, generating fatigue analysis results of the impeller operating in the oil medium. In this way, this application combines impeller structural data and impeller operating environment data to perform fatigue analysis on the impeller, considering the significant impact of the operating environment on the impeller's fatigue performance. Based on the average stress and stress amplitude obtained from static stress analysis and harmonious response analysis, a fatigue strength diagram is drawn, and multiple fatigue analysis points are determined. The fatigue strength is checked by analyzing the safety factors of multiple fatigue analysis points through the fatigue strength diagram, generating fatigue analysis results of the impeller operating in oil medium, so as to assess the fatigue risk of multiple key locations, improve the reliability of impeller fatigue analysis, and realize the safety analysis of submersible pump impeller operating in oil medium.

[0011] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0012] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 A schematic flowchart of a pump wheel fatigue analysis method provided in an embodiment of this application is shown; Figure 2(a) shows a schematic diagram of an example computational fluid dynamics (CFD) model provided in an embodiment of this application; Figure 2(b) shows a schematic diagram of an example fluid model provided in an embodiment of this application; Figure 3(a) shows a schematic diagram of blade displacement in the X direction according to an embodiment of this application; Figure 3(b) shows a schematic diagram of the blade displacement in the Y direction according to an embodiment of this application; Figure 3(c) shows a schematic diagram of the blade Z-direction displacement of an example provided in an embodiment of this application; Figure 4(a) shows a frequency domain diagram of multi-part pressure pulsation of an impeller blade, as provided in an embodiment of this application. Figure 4(b) shows a frequency domain diagram of multi-part pressure pulsation of an impeller shaft disk according to an embodiment of this application; Figure 4(c) shows a frequency domain diagram of multi-part pressure pulsation of an example impeller cover provided in an embodiment of this application; Figure 5 This illustration shows a schematic diagram of the security factor of an example provided in an embodiment of this application; Figure 6 This document illustrates a flowchart of an example fatigue verification analysis provided in an embodiment of this application. Figure 7 A schematic diagram of a pump wheel fatigue analysis device provided in an embodiment of this application is shown. Detailed Implementation

[0015] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0016] Current fatigue analysis techniques typically rely solely on the pump impeller's geometry and material properties, neglecting the significant impact of the operating environment (such as media characteristics, temperature, pressure, multiphase flow conditions, and corrosive components) on fatigue performance. However, the actual service life of pump impellers varies considerably under different operating conditions. For instance, in high-temperature, high-sand-content, or corrosive oil wells, the fatigue strength of the material decreases significantly, and the crack initiation and propagation rates accelerate. Analyzing solely based on the structure without coupling the dynamic effects of the actual operating environment on load characteristics (such as pressure pulsation amplitude and frequency) and material properties (such as fatigue limit and elastic modulus) leads to overly idealized fatigue life predictions, drastically reducing the accuracy and engineering applicability of the analysis results. Therefore, there is an urgent need to establish a fatigue analysis method for submersible pump impellers operating in oil media to improve the reliability of life assessment and the robustness of design.

[0017] To address the issue that current fatigue analysis techniques often rely solely on pump impeller geometry, neglecting the significant impact of the operating environment on fatigue performance, this embodiment provides a pump impeller fatigue analysis method. Figure 1 As shown, the method includes: Step 101: Obtain the impeller structure data and impeller operating environment data of the submersible pump.

[0018] The impeller operating environment data may include oil medium data to perform fatigue analysis on the impeller's operation in the oil medium.

[0019] In some embodiments, to conduct high-fidelity simulation analysis (such as fluid-structure interaction, fatigue life assessment, etc.) of the impeller of an Electrical Submersible Pump (ESP), impeller structural data and impeller operating environment data can be obtained based on impeller design drawings, impeller design requirements, and other data. This data is used to determine the geometry and materials of the impeller, as well as the operating conditions and media of the impeller's operating environment. This information can be used to analyze the safety of the ESP impeller operating in oil media. The operating environment affects the load characteristics. Combining the operating environment data with the analysis can make the impeller fatigue analysis results more consistent with actual engineering.

[0020] Specifically, impeller structure data may include impeller geometric parameters and impeller material properties; impeller geometric parameters may include the number of blades, the number of guide vanes, the inlet diameter, the outlet diameter, the hub diameter, the blade wrap angle, the blade thickness distribution, the impeller cover / disc structure, the axial length, and the surface roughness; impeller material properties may include density, elastic modulus, Poisson's ratio, yield strength, ultimate tensile strength, fatigue limit, and coefficient of thermal expansion. Impeller operating environment data may include operating condition parameters, oil medium data, and downhole environmental parameters; operating condition parameters may include rotational speed, flow rate, head, operating time, and start-stop frequency; oil medium data may include the density, dynamic viscosity, kinematic viscosity, sound velocity, and bulk modulus of the multiphase mixture delivered by the submersible pump (which can be simplified to single-phase oil analysis); downhole environmental parameters may include well temperature, well pressure, and media corrosivity.

[0021] Step 102: Based on the impeller structure data and impeller operating environment data, perform static stress analysis and harmonious response analysis on the impeller to obtain the average stress and stress amplitude of the impeller, and determine the corresponding fatigue analysis points of the impeller.

[0022] The fatigue analysis points may include, but are not limited to, the maximum static stress point and the maximum dynamic stress point of the impeller.

[0023] In some embodiments, an impeller model can be created based on impeller structure data. Based on the impeller model, static stress analysis is performed under constant loads (such as centrifugal force or steady-state fluid pressure) to calculate the stress and displacement response of the impeller structure and obtain the mean stress. The mean stress can be a constant component in the stress cycle, reflecting the weakening effect of long-term static load on fatigue. Harmonic response analysis is performed under harmonic excitation (such as periodic pressure pulsation) to calculate the steady-state dynamic stress response of the impeller structure in the frequency domain and obtain the stress amplitude. The stress amplitude can be an alternating component in the stress cycle, reflecting the fatigue damage caused by alternating loads.

[0024] Accordingly, based on the static stress analysis and harmonic response analysis results of the impeller, key locations for impeller fatigue analysis and evaluation can be selected as fatigue analysis points. These fatigue analysis points can include at least one analysis point (also called an observation point or node), such as the maximum static stress point, the maximum dynamic stress point, analysis points in stress concentration areas (e.g., small fillets, hole edges), or analysis points in manufacturing weak areas (weld seams, casting defect locations). The maximum static stress point can be the location with the highest von Mises stress in the static stress analysis, typically at the blade root or hub transition area; the maximum dynamic stress point can be the location with the highest dynamic stress amplitude in the harmonic response analysis.

[0025] Step 103: Draw the fatigue strength diagram of the impeller based on the average stress and stress amplitude of the impeller, and determine the safety factor corresponding to the fatigue analysis point based on the fatigue strength diagram.

[0026] In some embodiments, a fatigue strength diagram is plotted based on the impeller's average stress and stress amplitude. For example, a Goodman diagram can be plotted, defining a coordinate system with the horizontal axis representing average stress and the vertical axis representing stress amplitude. A Goodman failure criterion line is plotted based on the impeller's average stress and stress amplitude. Then, based on this diagram, the coordinates of each fatigue analysis point in the diagram are determined. The distance between the fatigue analysis point and the failure boundary is determined based on the coordinates and the Goodman failure criterion line. The safety factor of each fatigue analysis point is calculated, and the fatigue risk at multiple key locations is assessed to improve the reliability of impeller fatigue analysis.

[0027] Step 104: Perform fatigue strength verification on the impeller based on the safety factor, and generate fatigue analysis results of the impeller operating in oil medium.

[0028] In some embodiments, the allowable safety factor for the impeller's operation in the oil medium is first determined based on the impeller's application requirements and safety standards. Then, the safety factor calculated for each fatigue analysis point is compared with the allowable safety factor to check whether fatigue failure will occur at each fatigue analysis point within the design life. If the safety factor of a fatigue analysis point does not meet the allowable safety factor, optimization suggestions are provided for that point or its corresponding area to strengthen or modify the design, such as optimizing the structural design, changing materials, or adjusting operating conditions, until each fatigue analysis point meets the allowable safety factor. Based on the safety factor analysis results of each fatigue analysis point and the corresponding optimization suggestions, the fatigue analysis results of the impeller in the oil medium are generated. In this way, by analyzing multiple fatigue analysis points based on the safety factor, it is possible to clarify which areas meet the fatigue strength requirements and which areas need optimization, ensuring that the submersible pump impeller meets the design requirements and achieving safety analysis of the submersible pump impeller's operation in the oil medium.

[0029] By applying the technical solution of this application embodiment, this embodiment first obtains the impeller structure data and impeller operating environment data of the submersible pump impeller, including oil medium data; then, based on the impeller structure data and impeller operating environment data, static stress analysis and harmonious response analysis are performed on the impeller to obtain the impeller's average stress and stress amplitude, and the corresponding fatigue analysis points of the impeller are determined. These fatigue analysis points include at least the impeller's maximum static stress point and maximum dynamic stress point; next, a fatigue strength diagram of the impeller is drawn based on the impeller's average stress and stress amplitude, and the safety factor corresponding to the fatigue analysis points is determined based on the fatigue strength diagram; finally, the impeller is analyzed based on the safety factor. Fatigue strength verification is performed to generate fatigue analysis results for the impeller operating in oil medium. This embodiment combines impeller structural data and impeller operating environment data to perform fatigue analysis on the impeller, considering the significant impact of the operating environment on the impeller's fatigue performance. Based on the average stress and stress amplitude obtained from static stress analysis and harmonious response analysis, a fatigue strength diagram is drawn, and multiple fatigue analysis points are determined. The safety factor of multiple fatigue analysis points is analyzed through the fatigue strength diagram to verify the fatigue strength, generating fatigue analysis results for the impeller operating in oil medium. This assesses the fatigue risk at multiple key locations, improves the reliability of impeller fatigue analysis, and realizes the safety analysis of the submersible pump impeller operating in oil medium.

[0030] Furthermore, as a refinement and extension of the specific implementation of the above embodiments, in order to fully illustrate the implementation of this embodiment, optionally, static stress analysis and harmonic response analysis are performed on the impeller based on the impeller structure data and impeller operating environment data to obtain the average stress and stress amplitude of the impeller. Specifically, this may include: constructing a fluid model and a three-dimensional fluid-structure interaction model corresponding to the impeller based on the oil flow field corresponding to the oil medium data and the impeller structure data; using the fluid model to perform steady-state flow field analysis and steady-state stress analysis on the impeller to obtain the average stress of the impeller; and performing wet harmonic response analysis on the impeller based on the three-dimensional fluid-structure interaction model to obtain the stress amplitude of the impeller.

[0031] In some embodiments, the oil flow field refers to the spatial and temporal distribution of the flow state of the oil medium surrounding the submersible pump impeller during operation. This includes the field distribution of physical quantities such as velocity, pressure, density, and viscosity, and can be divided into steady flow fields (which do not change with time) and unsteady flow fields (which contain pulsations). This provides fluid loads (such as pressure distribution) for impeller fatigue analysis, reflecting phenomena such as flow separation, backflow, and impact that affect impeller performance and lifespan. Correspondingly, the fluid model can be a collection of computational domains, meshes, governing equations, and boundary conditions used for numerical simulation of the oil flow field. Specifically, it may include the geometric domain, mesh, governing equations, fluid properties, boundary conditions, and solver corresponding to the impeller, serving as the basis for fluid-structure interaction (FSI) simulation. A three-dimensional fluid-structure interaction model can include a fluid domain corresponding to the oil medium and a solid domain corresponding to the impeller, and realize an integrated simulation model for bidirectional transfer of physical quantities at the interface between the two. It is used to study the interaction between the fluid and the impeller structure. Specifically, it can include a fluid model, an impeller model, a coupling interface, a solution strategy, etc., forming a multi-physics integrated system. It can be used to perform wet modal analysis (considering the fluid's added mass), carry out unsteady fluid-structure interaction simulation, obtain real dynamic loads and damping, capture the interaction between the oil medium and the impeller, and support high-precision impeller fatigue life prediction.

[0032] Specifically, impeller structural data and impeller operating environment data can be obtained based on the impeller's basic dimensions, the impeller's environmental medium, and the characteristics of the operating medium for modeling. Specifically, a three-dimensional model is performed based on the impeller's geometric dimensions. Simultaneously, considering the oil medium environment, steady-state flow field analysis is conducted, analyzing the steady-state pressure of the flow field at the impeller's location. Considering the centrifugal force at the operating speed and the steady-state pressure, steady-state stress analysis of the impeller is performed to obtain the impeller's average stress. Considering the mass and sound velocity of the oil medium, wet modal calculations of fluid-structure interaction are performed on the impeller to obtain its modal displacements. These modal displacements are then used as boundary conditions to apply to the fluid model for unsteady analysis, obtaining the fluid medium damping ratio and transient pressure pulsations.

[0033] Optionally, a fluid model can be used to perform steady-state flow field analysis and steady-state stress analysis on the impeller to obtain the average stress of the impeller. Specifically, this may include: performing steady-state flow field analysis on the impeller using a fluid model to analyze the steady-state pressure of the impeller flow field; and performing steady-state stress analysis on the impeller based on the centrifugal force at the impeller operating speed and the steady-state pressure of the flow field to obtain the average stress of the impeller.

[0034] In some embodiments, steady flow field analysis can be performed based on fluid modeling to obtain steady-state flow field pressure. The steady-state flow field is then applied as a loading condition to the impeller channel and blade surface, and the rotational speed is applied in the form of centrifugal force. In cylindrical coordinates, axial and circumferential constraints are applied to the shaft hole, and steady-state stress analysis of the impeller is performed to obtain the average stress of the impeller.

[0035] Optionally, wet harmonic response analysis of the impeller can be performed based on a three-dimensional fluid-structure interaction model to obtain the stress amplitude of the impeller. Specifically, this may include: performing wet modal analysis of the impeller using a three-dimensional fluid-structure interaction model to obtain the modal displacements of the impeller; applying the modal displacements as boundary conditions to the fluid model for unsteady flow field analysis to obtain the fluid medium damping ratio and time-domain pressure pulsation value corresponding to the impeller; performing Fourier transform on the time-domain pressure pulsation value to obtain the corresponding frequency-domain pressure pulsation value, which is used as the harmonic load for the harmonic response analysis of the impeller; and performing wet harmonic response analysis based on the fluid medium damping ratio and frequency-domain pressure pulsation to obtain the stress amplitude of the impeller.

[0036] It should be noted that the modes obtained without considering the influence of the surrounding liquid when determining the intrinsic modes are called dry modes, while those that take the influence of the surrounding liquid into account are called wet modes.

[0037] In some embodiments, the impeller and the surrounding flow field are considered simultaneously to establish a three-dimensional fluid-structure interaction model, perform wet modal analysis of the impeller, and extract modal displacements.

[0038] Optionally, dynamic control equations for modal analysis can be constructed to quantify the relationship between the mechanical parameters and vibration response parameters of the fluid-structure interaction system, and to accurately extract the modal characteristics of the impeller (such as natural frequency and modal displacement), providing key input data for subsequent wet harmonic response analysis and unsteady fluid calculations.

[0039] For example, the dynamic governing equations can be expressed as differential equations: ; In the formula, This can represent the structural mass matrix corresponding to the impeller. This can represent the structural damping matrix corresponding to the impeller. This can represent the structural stiffness matrix corresponding to the impeller. This can represent the time-varying external force load function corresponding to the impeller. It can represent the nodal displacement vector corresponding to the impeller. It can represent the nodal velocity vector corresponding to the impeller. It can represent the nodal acceleration vector corresponding to the impeller.

[0040] In the structural modal analysis of the impeller, the influence of external forces does not need to be considered. Therefore, the dynamic governing equations of the modal analysis can be expressed as: ; Correspondingly, if we consider the liquid working environment of the impeller structure, its modal analysis kinetic governing equations can be expressed as: ; In the formula, This can represent the added mass matrix of the liquid (such as oil or water) corresponding to the impeller. This can represent the liquid-induced additional damping matrix corresponding to the impeller. It can represent the liquid-added stiffness matrix corresponding to the impeller.

[0041] Optionally, the stiffness matrix of the impeller can be represented by Young's modulus, and the mass matrix of the impeller can be represented by density. Due to the liquid's... The value itself is very small and the calculation can be ignored. Considering the liquid working environment of the impeller structure, its modal analysis dynamic governing equation can be expressed as: ; Correspondingly, the undamped natural frequency can be expressed as: ; In the formula, It can represent the undamped natural frequency of the impeller when it vibrates freely without a medium or damping. k It can represent the stiffness of the impeller. M It can indicate the metal mass of the impeller.

[0042] The undamped natural frequency of water can be expressed as: ; In the formula, This can represent the undamped natural frequency of the impeller's free vibration in an undamped medium. k It can represent the stiffness of the impeller. M It can indicate the metal mass of the impeller. It can represent the added mass of the water medium on the vibration of the impeller structure.

[0043] Furthermore, the damped natural frequency of the impeller can be expressed as: ; In the formula, The damping ratio coefficient, This can represent the undamped natural frequency of the impeller. It can represent the damped natural frequency of the impeller.

[0044] In some embodiments, modal displacements can be used as boundary conditions and applied to the fluid model to perform unsteady fluid calculations, obtaining the fluid medium damping ratio and time-domain pressure pulsation values. Specifically, during impeller vibration, the fluid consumes work, which consumes energy. This damping ratio, resulting from the work consumed by fluid damping, can be the fluid medium damping ratio, which can be obtained through fluid-solid coupling calculations.

[0045] Optional, fluid damping power consumption It can be calculated using the following formula: ; In the formula, is the start time of one vibration period of the impeller, is the vibration period, is the pressure, is the vibration velocity, is the normal unit vector, is the surface area.

[0046] Loss factor η can be defined as:[[ID=二十一]] [[ID=二十二]] ; In the formula, can be the maximum kinetic energy within one vibration period of the impeller.

[0047] Fluid medium damping ratio ξ The calculation formula can be expressed as: ; In the formula, is the damping coefficient, m can be the total mass of the system, such as the mass of the impeller itself M and the added mass of the fluid sum.

[0048] Specifically, the Fourier method based on energy theory is used to solve the fluid medium damping ratio, and it can be solved in combination with the CFD model. Exemplarily, the CFD model is shown in Figure 2(a). The blade modal vibration mode can be used as the motion boundary condition of the blade Blade, the inlet condition Inlet is the total temperature and total pressure, and the outlet condition Outlet is the mass flow rate. The computational domain adopts the rotating coordinate system model, and the computational domain is set as the rotating domain; the period, frequency, and vibration mode of the blade vibration are extracted through modal analysis and loaded into the fluid model, as shown in Figure 2(b). The blade motion affects the flow field through the multi-layer dynamic mesh technology, and the modal vibration mode is loaded into the fluid nephogram, as shown in Figure 3. Among them, Figure 3(a), Figure 3(b), and Figure 3(c) respectively show the displacement in the X direction (Displacement X Component), displacement in the Y direction (Displacement Y Component), and displacement in the Z direction (Displacement Z Component) of the blade (R1 Blade) when vibrating in the fluid, with the unit of meter (m).

[0049] In some embodiments, based on the fluid medium damping ratio, unsteady flow field analysis can be performed on the impeller and outlet blade model, considering the interference effect of the outlet stator blade. After the calculation results are stable, multiple periods of stable results are selected, and then the time-domain pressure pulsation value (transient pulsation pressure) acting on the impeller blade is obtained.

[0050] Optionally, the time-domain pressure pulsation value can be... x ( r Perform a Fourier transform to obtain the frequency domain pressure pulsation value. X ( k Specifically, since the actual sampled signal (fluid transient calculation result) is discrete, and the sample length of the sampled signal (the period length of the transient calculation) is finite, a discrete algorithm for Fourier transform needs to be used when performing Fourier transform on the digital vibration signal. The expression for the discrete Fourier transform can be: ; ; In the formula, Equivalent to , Equivalent to , r This can be the sequence number of the sampling time. k It can be the index of a frequency point. N Δ can be the sample length of the sampled signal. t It can be the time sampling interval, Δ It can be a frequency resolution.

[0051] For example, the hydraulic unsteady calculation uses the result of steady calculation as the initial condition, and can take 126 phase angles to calculate a total of 4 cycles of data. The pressure pulsation of each node of the impeller blades, rear cover plate and front cover plate is extracted. Through Fourier transform, the time domain pressure pulsation is converted into frequency domain pressure pulsation as the harmonic load for harmonic response analysis. Accordingly, Figure 4(a) shows the frequency domain diagram of pressure pulsation in multiple parts of the impeller blade, displaying the pressure pulsation amplitude of nodes 1-50 of the blade at different frequencies (e.g., rotational frequency, 1st pass frequency, 2nd pass frequency, 3rd pass frequency). The node coordinates corresponding to different nodes can be represented by three-dimensional coordinates (X, Y, Z). Node coordinates may include: (X: 1, Y: 36, Z: 5.23e+04), (X: 18, Y: 35, Z: 4.849e+04), (X: 18, Y: 10, Z: 4.85e+04), (X: 36, Y: 26, Z: 1.022e+04), (X: 54, Y: 27, Z: 54, Y: 27, Z: 54, Y: 26, Z: 54, Y: 27 ... 1125), for example, X can represent the node number, Y can represent the order, and Z can represent the pressure pulse amplitude. Accordingly, Figure 4(b) shows the frequency domain diagram of multi-part pressure pulsation of the impeller shaft disk, showing the pressure pulsation amplitude of the 200th-300th node of the shaft disk at different frequencies. The node coordinates may include: (X: 1, Y: 288, Z: 5.038e+04), (X: 18, Y: 279, Z: 1.097e+05), (X: 36, Y: 290, Z: 2.266e+04), (X: 54, Y: 299, Z: 8471); Figure 4(c) shows the frequency domain diagram of multi-part pressure pulsation of the impeller cover disk, showing the pressure pulsation amplitude of the 1001st-1100th node of the cover disk at different frequencies. The node coordinates may include: (X: 1, Y: 1093, Z: 6.6398e+04), (X: 18, Y: 1082, Z: 1.671e+05), (X: 36, Y: 1096, Z: 3.707e+04), (X: 54, Y: 1099, Z: 1.64e+04).

[0052] Furthermore, the effect of fluid-structure interaction and modal damping ratio can be considered, and the frequency domain pressure pulsation can be used as the loading condition to perform wet harmonic response analysis and obtain the stress amplitude.

[0053] Optionally, step 103 may specifically include: determining the fatigue type of the impeller based on the number of pressure cycles of the impeller; drawing a fatigue strength diagram based on the fatigue type, according to the average stress and stress amplitude; and determining the safety factor corresponding to the fatigue analysis point based on the coordinates of the fatigue analysis point and the coordinates of the fatigue strength diagram.

[0054] In some embodiments, the number of pressure cycles of the impeller can be calculated based on the impeller's design life (hours) and operating speed. If the number of pressure cycles exceeds a preset range, the fatigue type of the impeller and the corresponding analysis method can be determined.

[0055] For example, the blades rotate 7 times per revolution, and the impeller has 7 pressure cycles over a 60-year service life: ; This method of assessment can determine that the impeller fatigue type is high-cycle fatigue, and impeller fatigue analysis can be performed based on the SN curve and Goodman curve. In some embodiments, the fatigue limit for infinite life can be determined based on the SN curve of the impeller material, and a fatigue strength diagram can be plotted by combining this with the tensile strength of the impeller at the design temperature.

[0056] Optionally, the safety factor corresponding to the fatigue analysis point is determined based on the coordinates of the fatigue analysis point and the coordinates of the fatigue strength diagram. Specifically, this may include: obtaining the projected coordinates of the fatigue analysis point in different directions on the fatigue strength curve of the fatigue strength diagram; and determining the safety factor corresponding to the fatigue analysis point based on the ratio of the coordinates of the fatigue analysis point to the projected coordinates in different directions. The safety factor includes at least a horizontal safety factor, a vertical safety factor, and a radial safety factor.

[0057] The fatigue strength diagram may include a Goodman diagram. For example, the fatigue strength can be checked using the safety factor method based on the Goodman line equation. The Goodman line equation based on the safety factor can be expressed as: ; In the formula, σ a The stress amplitude of the impeller is obtained from wet harmonic response analysis (the peak value of dynamic stress fluctuation). σ m The average stress of the impeller is obtained from steady-state stress analysis (static foundation stress). The fatigue limit for the impeller material at its infinite lifespan. S u The fatigue limit (tensile strength) of the impeller material, and the allowable safety factor. n It can be 1.5.

[0058] Correspondingly, the formula for calculating the safety factor corresponding to the fatigue analysis point can be expressed as: ; In the formula, This can represent the safety factor corresponding to the fatigue analysis point. S e This can be the average stress corresponding to the fatigue analysis point. This can be the stress amplitude corresponding to the fatigue analysis point.

[0059] For example, the Goodman curve has the horizontal axis coordinates as (Sm, 0) and the vertical axis coordinates as (0, Sa). At the design temperature, Sm is 685 MPa. According to the material's Sm-Sm curve, the fatigue limit Sa for infinite life is 93.7 MPa. The Goodman plot is drawn based on these data, as shown below. Figure 5 As shown, the fatigue strength curve representing the endurance limit is illustrated. Furthermore, based on this curve, the projected coordinates of the fatigue analysis points on the fatigue strength curve in different directions can be obtained. Based on these projected coordinates, formulas for calculating the safety factor in different directions can be constructed, which can be expressed as: , , ; In the formula, It can represent the horizontal projection coordinates of the fatigue analysis point on the Goodman line, and it can represent the allowable average stress on the Goodman line corresponding to the same stress amplitude as the fatigue analysis point. This can represent the horizontal distance from the fatigue analysis point to the vertical axis. This can represent the horizontal safety factor corresponding to the fatigue analysis point; It can represent the vertical projection coordinates of the fatigue analysis point on the Goodman line, and it can represent the allowable stress amplitude on the Goodman line corresponding to the average stress at the fatigue analysis point. It can represent the vertical distance from the fatigue analysis point to the horizontal axis. This can represent the vertical safety factor corresponding to the fatigue analysis point; on the Goodman line, the intersection of the radial extension of the fatigue analysis point and the origin with the Goodman line can be obtained first. This can represent the radial distance between the intersection point and the origin. It can represent the radial distance between the fatigue analysis point and the origin. It can represent the radial safety factor corresponding to the fatigue analysis point.

[0060] For example, the point of maximum stress during impeller static stress analysis and the point of maximum dynamic stress corresponding to the peak frequency of the frequency response curve during harmonic response analysis can be selected as the points of investigation. Then, based on the impeller steady-state analysis and harmonic response analysis results for each point, the position of each point on the Goodman diagram is determined. Finally, the safety factor is calculated using the formulas corresponding to different directions to determine whether the impeller meets the design requirements.

[0061] Optionally, step 104 may specifically include: verifying the fatigue strength of the impeller by comparing the safety factor with the allowable safety factor, and obtaining the comparison results of the fatigue analysis points; generating the fatigue analysis results of the impeller running in the oil medium based on the comparison results, and using the fatigue analysis results to determine whether the impeller meets the impeller design requirements.

[0062] In some embodiments, the safety factor of each fatigue analysis point in different directions can be calculated, and the different safety factors can be compared with the allowable safety factor to determine whether each fatigue analysis point meets the safety standard. This process needs to cover all key examination points and ultimately determine whether the impeller meets the design requirements.

[0063] As one possible implementation method, such as Figure 6 As shown, the simulation process for fatigue analysis of a submersible pump impeller can include the following steps: fluid modeling based on the flow field and mesh generation; steady-state flow field analysis to extract the steady-state pressure field; steady-state stress analysis of the impeller using the steady-state pressure field as a loading condition to extract the mean stress; correspondingly, a three-dimensional fluid-structure interaction model of the impeller can be established based on two-dimensional drawings and sector division; wet modal analysis of the impeller can be performed to extract modal displacements; CFD unsteady calculations can be performed in conjunction with fluid modeling to extract the fluid damping ratio and time-domain pressure pulsation values ​​(time-domain pulsation values); the time-domain pulsation values ​​can be converted into frequency-domain pulsation values; harmonic response analysis can be performed considering the fluid medium to extract the stress amplitude; finally, fatigue verification can be performed based on the mean stress and stress assignment.

[0064] For example, if fatigue verification detects that all fatigue analysis points meet the requirements, the fatigue analysis result of the impeller operating in the oil medium can be generated and described as: "The fatigue strength of the impeller operating in the oil medium meets the design requirements. The horizontal, vertical, and radial safety factors of each test point are not lower than the allowable safety factor, and high-cycle fatigue safe operation with a design life of 60 years can be achieved." If at least one fatigue analysis point is detected as not meeting the requirements, the generated fatigue analysis result can be described as: "The fatigue strength of the impeller operating in the oil medium does not meet the design requirements. The XX safety factor (e.g., radial safety factor) of XX test point (e.g., blade root) is lower than the allowable safety factor, and there is a risk of high-cycle fatigue failure. It is necessary to optimize the impeller structure (e.g., thicken the weak parts) or adjust the operating parameters (e.g., reduce the speed)."

[0065] Compared with related technologies, this embodiment can combine impeller structure data and impeller operating environment data to perform fatigue analysis on the impeller. It considers the significant impact of the operating environment on the impeller's fatigue performance, and draws a fatigue strength diagram based on the average stress and stress amplitude obtained from static stress analysis and harmonious response analysis. It also identifies multiple fatigue analysis points and verifies the fatigue strength by analyzing the safety factors of multiple fatigue analysis points through the fatigue strength diagram. This generates fatigue analysis results for the impeller operating in oil medium, assesses the fatigue risk at multiple key locations, improves the reliability of impeller fatigue analysis, realizes safety analysis of submersible pump impeller operating in oil medium, and compares multi-dimensional safety factors with allowable safety factors based on the fatigue strength diagram. This ensures that the impeller has sufficient safety margin under the static average stress, dynamic stress amplitude, and their coupling effect in oil medium, ultimately guaranteeing its long-term operational safety in high-cycle fatigue scenarios and improving the accuracy of submersible pump impeller fatigue life prediction.

[0066] Furthermore, embodiments of this application provide a pump impeller fatigue analysis device, such as... Figure 7 As shown, the device includes: an acquisition module 31, a determination module 32, and a generation module 33.

[0067] The acquisition module 31 is configured to acquire impeller structure data and impeller operating environment data of the submersible pump impeller, including oil medium data; based on the impeller structure data and impeller operating environment data, static stress analysis and harmonious response analysis are performed on the impeller to acquire the average stress and stress amplitude of the impeller, and the fatigue analysis points corresponding to the impeller are determined. The fatigue analysis points include at least the maximum static stress point and the maximum dynamic stress point of the impeller. The module 32 is configured to draw a fatigue strength diagram of the impeller based on the average stress and stress amplitude of the impeller, and determine the safety factor corresponding to the fatigue analysis point based on the fatigue strength diagram; The generation module 33 is configured to perform fatigue strength verification on the impeller based on the safety factor and generate fatigue analysis results of the impeller operating in the oil medium.

[0068] In some embodiments, the acquisition module 31 is specifically configured to construct a fluid model and a three-dimensional fluid-structure interaction model of the oil flow field corresponding to the impeller based on the oil medium data and the impeller structure data; perform steady flow field analysis and steady-state stress analysis on the impeller using the fluid model to obtain the average stress of the impeller; and perform wet harmonic response analysis on the impeller based on the three-dimensional fluid-structure interaction model to obtain the stress amplitude of the impeller.

[0069] In some embodiments, the acquisition module 31 is specifically configured to perform steady flow field analysis on the impeller using a fluid model, analyze the steady-state pressure of the impeller flow field, and perform steady-state stress analysis on the impeller based on the centrifugal force at the impeller operating speed and the steady-state pressure of the flow field to obtain the average stress of the impeller.

[0070] In some embodiments, the acquisition module 31 is further configured to perform wet modal analysis of the impeller using a three-dimensional fluid-structure interaction model to obtain the modal displacements of the impeller; apply the modal displacements as boundary conditions to the fluid model for unsteady flow field analysis to obtain the fluid medium damping ratio and time-domain pressure pulsation value corresponding to the impeller; perform Fourier transform on the time-domain pressure pulsation value to obtain the frequency-domain pressure pulsation value corresponding to the time-domain pressure pulsation value, and use the frequency-domain pressure pulsation value as the harmonic load for the harmonic response analysis of the impeller; and perform wet harmonic response analysis based on the fluid medium damping ratio and frequency-domain pressure pulsation to obtain the stress amplitude of the impeller.

[0071] In some embodiments, the determining module 32 is specifically configured to determine the fatigue type of the impeller based on the number of pressure cycles of the impeller; draw a fatigue strength diagram based on the fatigue type, according to the average stress and stress amplitude; and determine the safety factor corresponding to the fatigue analysis point based on the coordinates of the fatigue analysis point and the coordinates of the fatigue strength diagram.

[0072] In some embodiments, the determining module 32 is specifically configured to obtain the projected coordinates of the fatigue analysis point in different directions on the fatigue strength curve in the fatigue strength diagram; and to determine the safety factor corresponding to the fatigue analysis point based on the ratio of the coordinates of the fatigue analysis point to the projected coordinates in different directions, wherein the safety factor includes at least a horizontal safety factor, a vertical safety factor, and a radial safety factor.

[0073] In some embodiments, the determining module 32 is specifically configured to perform fatigue strength verification on the impeller by comparing the safety factor with the allowable safety factor, and obtain the comparison results of fatigue analysis points; generate fatigue analysis results of the impeller running in the oil medium based on the comparison results, and use the fatigue analysis results to determine whether the impeller meets the impeller design requirements.

[0074] It should be noted that other corresponding descriptions of the functional units involved in the pump wheel fatigue analysis device provided in this application embodiment can be found by referring to... Figure 1 The corresponding descriptions in [the document] will not be repeated here.

[0075] Based on the above, Figure 1 As illustrated in the example, correspondingly, embodiments of this application also provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-described... Figure 1 The example method shown.

[0076] Based on the above, Figure 1 As illustrated, correspondingly, embodiments of this application also provide a computer program product, including a computer program that, when executed by a processor, implements the above-described... Figure 1 The example method shown.

[0077] Based on this understanding, the technical solutions of the embodiments of this application can be embodied in the form of a software product. The software product can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, mobile hard drive, etc.) and includes several instructions to cause a computer device (such as a personal computer, server, or network device, etc.) to execute the methods of various implementation scenarios of this application.

[0078] Based on the above, Figure 1 The method shown, and Figure 7 To achieve the above objectives, the present application also provides an electronic device, comprising a storage medium and a processor; the storage medium for storing a computer program; and the processor for executing the computer program to implement the above-described virtual device embodiments. Figure 1 The method shown.

[0079] Optionally, the aforementioned electronic device may also include a user interface, a network interface, a camera, radio frequency (RF) circuitry, sensors, audio circuitry, a Wi-Fi module, etc. The user interface may include a display screen, an input unit, etc.

[0080] Those skilled in the art will understand that the physical device structure provided in this embodiment does not constitute a limitation on the physical device, and may include more or fewer components, or combine certain components, or have different component arrangements. The storage medium may also include an operating system and a network communication module. The operating system is a program that manages the hardware and software resources of the aforementioned physical device, supporting the operation of information processing programs and other software and / or programs. The network communication module is used to enable communication between the various components within the storage medium, as well as communication with other hardware and software in the information processing physical device.

[0081] Through the above description of the embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus necessary general-purpose hardware platforms, or it can be implemented by hardware. This application can combine impeller structure data and impeller operating environment data to perform fatigue analysis on the impeller, considering the significant influence of the operating environment on the impeller fatigue performance. Based on the average stress and stress amplitude obtained from static stress analysis and harmonious response analysis, a fatigue strength diagram is drawn, and multiple fatigue analysis points are determined. The fatigue strength is checked by analyzing the safety factors of multiple fatigue analysis points through the fatigue strength diagram, generating fatigue analysis results of the impeller operating in oil medium, so as to assess the fatigue risk of multiple key locations, improve the reliability of impeller fatigue analysis, realize the safety analysis of submersible pump impeller operating in oil medium, and compare the multi-dimensional safety factor with the allowable safety factor based on the fatigue strength diagram to ensure that the impeller has sufficient safety margin under the static average stress, dynamic stress amplitude and the coupling effect of the two in oil medium, ultimately ensuring its long-term operating safety in high-cycle fatigue scenarios and improving the accuracy of submersible pump impeller fatigue life prediction.

[0082] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the term "comprising" or any other variations thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0083] The above are merely specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to these embodiments, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method of pump wheel fatigue analysis, characterized by, The method comprises the following steps: obtaining impeller structure data of an impeller of a submersible pump and impeller operating environment data, wherein the impeller operating environment data comprises oil medium data; performing static stress analysis and harmonic response analysis on the impeller according to the impeller structure data and the impeller operating environment data, obtaining average stress and stress amplitude of the impeller, and determining fatigue analysis points corresponding to the impeller, wherein the fatigue analysis points at least include a maximum static stress point of the impeller and a maximum dynamic stress point of the impeller; drawing a fatigue strength diagram of the impeller according to the average stress and the stress amplitude of the impeller, and determining a safety factor corresponding to the fatigue analysis points based on the fatigue strength diagram; performing fatigue strength checking on the impeller according to the safety factor, and generating a fatigue analysis result of the impeller operating in the oil medium.

2. The method of claim 1, wherein, The method of performing static stress analysis and harmonic response analysis on the impeller according to the impeller structure data and the impeller operating environment data, and obtaining the average stress and the stress amplitude of the impeller comprises the following steps: constructing a fluid model and a three-dimensional fluid-structure coupling model of an oil flow field corresponding to the impeller according to the oil medium data and the impeller structure data; performing flow field steady analysis and steady stress analysis on the impeller by using the fluid model, and obtaining the average stress of the impeller; performing wet-state harmonic response analysis on the impeller based on the three-dimensional fluid-structure coupling model, and obtaining the stress amplitude of the impeller.

3. The method of claim 2, wherein, The method of performing flow field steady analysis and steady stress analysis on the impeller by using the fluid model, and obtaining the average stress of the impeller comprises the following steps: performing flow field steady analysis on the impeller by using the fluid model, and analyzing steady-state pressure of the flow field of the impeller; performing steady stress analysis on the impeller according to centrifugal force of the operating speed of the impeller and the steady-state pressure of the flow field, and obtaining the average stress of the impeller.

4. The method of claim 1, wherein, The method of performing wet-state harmonic response analysis on the impeller based on the three-dimensional fluid-structure coupling model, and obtaining the stress amplitude of the impeller comprises the following steps: performing fluid-structure coupling wet modal analysis on the impeller by using the three-dimensional fluid-structure coupling model, and obtaining modal displacement of the impeller; loading the modal displacement as a boundary condition to the fluid model to perform unsteady flow field analysis, and obtaining fluid medium damping ratio and time-domain pressure pulsation value corresponding to the impeller; performing Fourier transform on the time-domain pressure pulsation value, and obtaining frequency-domain pressure pulsation value corresponding to the time-domain pressure pulsation value, wherein the frequency-domain pressure pulsation value is used as harmonic load of the harmonic response analysis of the impeller; performing wet-state harmonic response analysis based on the fluid medium damping ratio and the frequency-domain pressure pulsation, and obtaining the stress amplitude of the impeller.

5. The method of claim 1, wherein, The method of drawing a fatigue strength diagram of the impeller according to the average stress and the stress amplitude of the impeller, and determining a safety factor corresponding to the fatigue analysis points based on the fatigue strength diagram comprises the following steps: determining a fatigue type of the impeller according to a pressure cycle number of the impeller; drawing the fatigue strength diagram according to the average stress and the stress amplitude based on the fatigue type; determining the safety factor corresponding to the fatigue analysis points according to coordinates of the fatigue analysis points and coordinates of the fatigue strength diagram.

6. The method of claim 5, wherein, The safety factor corresponding to the fatigue analysis point is determined according to the coordinates of the fatigue analysis point and the coordinates of the fatigue strength diagram, and the safety factor includes at least a horizontal safety factor, a vertical safety factor, and a radial safety factor. The projection coordinates of the fatigue analysis point in different directions on the fatigue strength curve in the fatigue strength diagram are obtained. The safety factor corresponding to the fatigue analysis point is determined according to the ratio of the coordinates of the fatigue analysis point to the projection coordinates in the different directions, and the safety factor includes at least a horizontal safety factor, a vertical safety factor, and a radial safety factor.

7. The method of claim 1, wherein, The fatigue strength of the impeller is checked according to the safety factor, and a fatigue analysis result of the impeller running in the oil medium is generated, and the fatigue analysis result is used to determine whether the impeller meets the design requirements of the impeller. The fatigue strength of the impeller is checked by comparing the safety factor with the allowable safety factor, and a comparison result of the fatigue analysis point is obtained. The fatigue analysis result of the impeller running in the oil medium is generated according to the comparison result, and the fatigue analysis result is used to determine whether the impeller meets the design requirements of the impeller.

8. A pump wheel fatigue analysis apparatus characterized by comprising: The method comprises the following steps: The obtaining module is configured to obtain impeller structure data and impeller operating environment data of an impeller of a submersible pump, wherein the impeller operating environment data includes oil medium data; the impeller structure data and the impeller operating environment data are used to perform static stress analysis and harmonic response analysis on the impeller, to obtain average stress and stress amplitude of the impeller, and to determine fatigue analysis points corresponding to the impeller, wherein the fatigue analysis points include at least a maximum static stress point of the impeller and a maximum dynamic stress point of the impeller; The determining module is configured to draw a fatigue strength diagram of the impeller according to the average stress and the stress amplitude of the impeller, and to determine a safety factor corresponding to the fatigue analysis points based on the fatigue strength diagram; The generating module is configured to check the fatigue strength of the impeller according to the safety factor, and to generate a fatigue analysis result of the impeller running in the oil medium.

9. A computer readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to implement the method of any one of claims 1 to 7.

10. An electronic device comprising a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, characterized in that, The processor executes the computer program to implement the method of any one of claims 1 to 7.

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