Reliability analysis and verification method for turbine casing joint considering uncertainty

Abstract

The application provides a turbine casing connecting part reliability analysis and verification method considering uncertainty, and the method comprises the following steps: establishing a finite element analysis model of a turbine casing local connecting structure to realize the representation of connecting stiffness uncertainty; establishing a turbine casing structure uncertainty analysis model considering the connecting stiffness uncertainty; determining a failure mode of the turbine casing connecting part and defining a failure function function, and performing reliability analysis on the turbine casing structure; designing a characteristic simulation piece of the connecting part according to the turbine casing finite element analysis result; processing the characteristic simulation piece of the turbine casing connecting part and performing a fatigue test; obtaining the turbine casing finite element analysis result of the processed characteristic simulation piece, and verifying the processed characteristic simulation piece in combination with the dispersion of the fatigue life data. The application realizes the precision and engineering of the reliability analysis of the turbine casing connecting part, and improves the precision of the reliability evaluation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of reliability research of turbine casing, and particularly relates to a reliability analysis and verification method for a turbine casing connecting part considering uncertainty. BACKGROUND

[0002] The turbine casing is a key component in an aero-engine, mainly serving to support the turbine assembly and guide airflow. Its design requirements not only include bearing high temperature, high pressure and high mechanical load, but also ensuring the mutual cooperation and stable operation of various components during flight. Therefore, the structural reliability of the turbine casing is crucial to the overall performance and safety of the engine.

[0003] In the research status of the reliability analysis and verification method for the turbine casing structure considering the uncertainty of the connecting stiffness, the theoretical research first emphasizes the importance of probabilistic reliability analysis, and evaluates the probability of connection failure by statistically modeling factors such as material properties, connection strength and external load. At the same time, uncertainty analysis has become a popular topic, and researchers use sensitivity analysis and uncertainty propagation analysis to identify key factors affecting connection reliability. In terms of experimental research, the testing work of connection strength is also continuously deepening, and scholars conduct static loading, fatigue and environmental simulation experiments to establish the reliability of the connecting part under different conditions. In addition, structural health monitoring (SHM) technology is gradually applied to monitor the connection state in real time and predict the failure risk. In terms of the application of computer simulation, finite element analysis (FEA) has become the main means of connection reliability analysis. Researchers evaluate the stress and deformation of the turbine casing connecting part under complex loads by establishing a high-precision model of the connecting part.

[0004] Existing experimental and computational data show that the turbine casing connecting part is one of the most critical and dangerous parts of the entire turbine casing. This part bears huge mechanical stress and thermal load as well as extreme aerodynamic conditions. Under such complex working conditions, the uncertainty of the connecting stiffness of the turbine casing has a significant impact on the fatigue life of the entire casing. These uncertainty factors not only may lead to a decline in equipment performance, but also may cause more serious safety hazards. Therefore, it is necessary to conduct a systematic reliability analysis and verification of the connecting stiffness uncertainty of this part to ensure its safety and stability under actual working conditions, thereby ensuring the efficient operation and service life of the turbine casing. Therefore, when analyzing the reliability of the turbine casing, it is very important to establish a turbine casing structure uncertainty analysis model considering the uncertainty of the connecting stiffness.

[0005] To realize the establishment of the turbine casing structure uncertainty analysis model, it is necessary to create a characterization method for the uncertainty of the turbine casing connecting stiffness. However, at present, there is relatively little research on the characterization of the uncertainty of the turbine casing connecting stiffness at home and abroad, and no mature and effective uncertainty characterization method has been formed. SUMMARY

[0006] The present application aims to at least partially solve one of the problems in the related art.

[0007] To this end, a first object of the present application is to propose a method for analyzing and verifying the reliability of a turbine casing connection site taking into account uncertainties.

[0008] A second object of the present application is to propose a device for analyzing and verifying the reliability of a turbine casing connection site taking into account uncertainties.

[0009] A third object of the present application is to propose an electronic device.

[0010] A fourth object of the present application is to propose a computer-readable storage medium.

[0011] A fifth object of the present application is to propose a computer program product.

[0012] To achieve the above objects, a first aspect of the present application proposes a method for analyzing and verifying the reliability of a turbine casing connection site taking into account uncertainties, comprising:

[0013] establishing a finite element analysis model of a local connection structure of a turbine casing, and establishing an uncertainty analysis model of the local connection structure of the turbine casing based on the representation of uncertainties of the geometric dimensions, material properties and tightening torque of the connection structure, to realize the representation of connection stiffness uncertainties;

[0014] establishing a finite element analysis model of the overall turbine casing, and establishing a turbine casing structure uncertainty analysis model taking into account the connection stiffness uncertainties according to the connection stiffness uncertainties;

[0015] determining the failure mode of the turbine casing connection site based on the turbine casing structure uncertainty analysis model, and defining a functional function of failure to perform reliability analysis of the turbine casing structure;

[0016] extracting the stress state of the connection site and the force characteristics of the bolts according to the finite element analysis results of the turbine casing, and designing a feature simulation piece of the connection site based thereon;

[0017] machining the feature simulation piece of the turbine casing connection site, performing fatigue tests on the machined feature simulation piece, and obtaining the dispersion of fatigue life data;

[0018] obtaining the finite element analysis results of the machined feature simulation piece of the turbine casing, and combining the dispersion of the fatigue life data to verify the machined feature simulation piece.

[0019] Optionally, the finite element analysis model of the turbine casing local connection structure is established, and the uncertainty analysis model of the turbine casing local connection structure is established based on the uncertainty representation of the geometric size, material performance and tightening torque of the connection structure, so as to realize the uncertainty representation of the connection stiffness, including:

[0020] The uncertainty of the material performance of the connection part is represented using a probability model and existing material performance data, wherein the uncertainty of the material performance includes the elastic modulus and Poisson's ratio uncertainty of the bolt and nut;

[0021] The uncertainty of the geometric size of the connection part is represented using a probability model and tolerance data or measurement data of the geometric size, wherein the uncertainty of the geometric size includes the geometric tolerance uncertainty of the bolt and nut;

[0022] The uncertainty of the tightening torque is represented using a probability model and measured data of the torque wrench;

[0023] Based on the uncertainty representation of the above material performance, geometric size and tightening torque, a parameterized model of the turbine casing local connection structure is constructed;

[0024] The uncertainty analysis of the turbine casing local connection structure is performed using the parameterized model, so as to realize the uncertainty representation of the connection stiffness.

[0025] Optionally, the finite element analysis model of the overall turbine casing is established, and the turbine casing structure uncertainty analysis model considering the connection stiffness uncertainty is established according to the connection stiffness uncertainty, including:

[0026] The finite element analysis model of the overall turbine casing is established according to the actual service condition and boundary condition of the turbine casing;

[0027] The connection stiffness uncertainty is integrated into the finite element analysis model of the overall turbine casing, and the turbine casing structure uncertainty analysis model considering the connection stiffness uncertainty is constructed in combination with the uncertainty of the material performance, geometric size and service load of the turbine casing.

[0028] Optionally, the failure mode of the turbine casing connection part is determined based on the turbine casing structure uncertainty analysis model, and a failure function is defined for the reliability analysis of the turbine casing structure, including:

[0029] The stress state of the turbine casing connection part is analyzed according to the turbine casing uncertainty analysis model, and the failure mode is determined;

[0030] The failure function is defined, the failure mode of the turbine casing connection part is converted into a standard for reliability analysis, and then the reliability analysis of the turbine casing structure is performed.

[0031] Optionally, the stress state of the connecting part and the force characteristics of the bolt are extracted according to the finite element analysis result of the turbine casing, and a characteristic simulation piece of the connecting part is designed according to the stress state and the force characteristics.

[0032] The stress state of the connecting part and the force characteristics of the bolt are extracted according to the finite element analysis result of the turbine casing.

[0033] The characteristic simulation piece of the connecting part of the turbine casing is designed based on the principles of geometric similarity, stress distribution consistency, and bolt force characteristics consistency.

[0034] Optionally, the turbine casing finite element analysis result of the processed characteristic simulation piece is obtained, including:

[0035] The geometric size and material performance of the processed characteristic simulation piece are measured, and the tightening torque during connection is recorded.

[0036] The turbine casing finite element analysis result of the processed characteristic simulation piece is determined according to the measurement data and the recorded data.

[0037] To achieve the above purpose, the second aspect embodiment of the present application proposes a turbine casing connecting part reliability analysis and verification device considering uncertainty, including:

[0038] A first establishing module is configured to establish a finite element analysis model of a local connecting structure of a turbine casing, and establish an uncertainty analysis model of the local connecting structure of the turbine casing based on the uncertainty representation of the geometric size, material performance, and tightening torque of the connecting structure, so as to realize the representation of the connecting stiffness uncertainty.

[0039] A second establishing module is configured to establish a finite element analysis model of an overall turbine casing, and establish a turbine casing structure uncertainty analysis model considering the connecting stiffness uncertainty according to the connecting stiffness uncertainty.

[0040] A reliability analysis module is configured to determine the failure mode of the turbine casing connecting part based on the turbine casing structure uncertainty analysis model, and define a failure function to perform reliability analysis of the turbine casing structure.

[0041] A design module is configured to extract the stress state of the connecting part and the force characteristics of the bolt according to the finite element analysis result of the turbine casing, and design a characteristic simulation piece of the connecting part according to the stress state and the force characteristics.

[0042] A fatigue test module is configured to process a characteristic simulation piece of the turbine casing connecting part, perform a fatigue test on the processed characteristic simulation piece, and obtain the dispersion of fatigue life data.

[0043] A verification module is configured to obtain a turbine casing finite element analysis result of the machined feature mockup, and verify the machined feature mockup in combination with the dispersion of the fatigue life data.

[0044] To achieve the above object, the third aspect of the present application provides an electronic device, comprising: a processor, and a memory connected with the processor in communication;

[0045] The memory stores computer execution instructions.

[0046] The processor executes the computer execution instructions stored in the memory to implement the method according to any one of the first aspect.

[0047] To achieve the above object, the fourth aspect of the present application provides a computer readable storage medium, wherein the computer readable storage medium stores computer execution instructions, and the computer execution instructions are executed by a processor to implement the method according to any one of the first aspect.

[0048] To achieve the above object, the fifth aspect of the present application provides a computer program product, wherein the computer program is executed by a processor to implement the method according to any one of the first aspect.

[0049] The embodiments of the present application provide at least the following beneficial effects:

[0050] The present application establishes a characterization method for the uncertainty of the turbine casing connection stiffness, realizes the accurate analysis of the performance and failure mode of the local connection part of the turbine casing under complex working conditions, avoids the analysis result deviation caused by the insufficient research on the connection stiffness uncertainty in the traditional method, improves the reliability and accuracy of the performance prediction of the connection part, and through the finite element analysis model of the local connection structure of the turbine casing and the uncertainty analysis model of the overall structure, the local connection characteristics can be systematically integrated into the overall analysis model, thereby solving the problem of disconnection between local and overall analysis.

[0051] In addition, the present application combines numerical simulation with fatigue test, realizes the closed-loop process from theoretical analysis to experimental verification through the design of verification scheme and reliability analysis steps, avoids the limitation that a single method cannot accurately evaluate the connection performance and life, and improves the consistency between the model results and the actual working conditions. The method can identify the potential failure mode of the turbine casing connection part, evaluate the failure risk caused by uncertain factors (such as material performance, geometric size and tightening torque), thereby reducing the overall failure risk caused by the failure of the connection part.

[0052] Overall, by comprehensively considering the uncertainty of the connecting part under the complex working environment of the aero-engine (such as high temperature, high stress and fatigue load), the application can more accurately evaluate the performance and life of the turbine casing connecting part, provide important technical support for long-life and high-reliability engine structure design, and ultimately improve the overall safety and reliability of the aero-engine, providing a scientific basis for flight safety and engineering design optimization.

[0053] Additional aspects and advantages of the application will be set forth in part in the description that follows, and in part will become apparent to those skilled in the art upon examination of the following description and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0054] The above and / or additional aspects and advantages of the application will become apparent and be readily appreciated from the following description, including the accompanying drawings, in which:

[0055] Figure 1 A flowchart of a reliability analysis and verification method for a turbine casing connecting part considering uncertainty provided by an embodiment of the application;

[0056] Figure 2 A flowchart of a reliability analysis and verification method for a turbine casing connecting part considering uncertainty provided by an embodiment of the application;

[0057] Figure 3 A flowchart of a reliability analysis and verification method for a turbine casing connecting part considering uncertainty provided by an embodiment of the application;

[0058] Figure 4 A flowchart of a reliability analysis and verification method for a turbine casing connecting part considering uncertainty provided by an embodiment of the application;

[0059] Figure 5 A flowchart of a reliability analysis and verification method for a turbine casing connecting part considering uncertainty provided by an embodiment of the application;

[0060] Figure 6 A schematic diagram of a turbine rear casing inner ring connecting simulation piece provided by an embodiment of the application;

[0061] Figure 7 A structural schematic diagram of a reliability analysis and verification device for a turbine casing connecting part considering uncertainty provided by an embodiment of the application. DETAILED DESCRIPTION

[0062] Embodiments of the present application are described below in detail, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0063] Currently, domestic reliability research on turbine casings generally focuses on overall analysis, and there is a lack of research data considering connection uncertainty, while the safety of an aero-engine is crucial to flight safety. In view of this problem, the embodiments of the present application provide a turbine casing connection part reliability analysis and verification method considering uncertainty, which can identify and understand potential failure modes by in-depth analysis of the reliability of the turbine casing connection part, reduce the risk of failure caused by connection uncertainty, and thus improve the overall safety and reliability. In the actual working environment of an aero-engine, the connection part is affected by various factors such as temperature, stress and fatigue, and considering these uncertain factors helps to more comprehensively evaluate the connection performance and life, thereby providing engineers with more accurate information to make more reasonable design and maintenance decisions.

[0064] Figure 1 A flowchart of a turbine casing connection part reliability analysis and verification method considering uncertainty provided by the embodiments of the present application is shown in FIG. 1. As shown in FIG. 1, the method comprises the following steps: Figure 1

[0065] Step 101, a finite element analysis model of the local connection structure of the turbine casing is established, and an uncertainty analysis model of the local connection structure of the turbine casing is established based on the uncertainty representation of the geometric size, material performance and tightening torque of the connection structure, to realize the representation of the connection stiffness uncertainty.

[0066] In the embodiments of the present application, first, a finite element analysis model of the local connection structure of the turbine casing is established; then, by analyzing the material performance (such as elastic modulus, Poisson's ratio), geometric size (tolerance of bolts and nuts) and tightening torque (fluctuation in actual operation), an uncertainty analysis model of the connection part is constructed; finally, the parameterization modeling technology is used to represent the uncertainty of the connection stiffness.

[0067] Among them, the connection stiffness uncertainty refers to the uncertainty of the connection performance of the turbine casing caused by factors such as the nature, state and environmental changes of the connection part during the operation of the turbine casing assembly. This uncertainty can affect the overall performance, reliability and safety of the turbine casing.

[0068] ​Through this step, the foundation is laid for subsequent reliability analysis, the accuracy of the analysis is improved by quantifying the uncertainty factors, and the model deviation problem caused by multi-source uncertainty in the connection stiffness characterization process is solved.

[0069] Figure 2 A flowchart of a turbine casing connection part reliability analysis and verification method considering uncertainty provided by the embodiments of the present application is shown in FIG. 1. Figure 2 As shown in FIG. 1, step 101 further includes:

[0070] In step 201, the uncertainty of the material performance of the connection part is characterized using a probability model and existing material performance data, wherein the uncertainty of the material performance includes the elastic modulus and Poisson's ratio uncertainty of the bolt and nut.

[0071] In the embodiments of the present application, the elastic modulus and Poisson's ratio uncertainty of the connection part is characterized using a probability model and material performance data.

[0072] In step 202, the uncertainty of the geometric size of the connection part is characterized using a probability model and tolerance data or measurement data of the geometric size, wherein the uncertainty of the geometric size includes the geometric tolerance uncertainty of the bolt and nut.

[0073] In the embodiments of the present application, the geometric tolerance uncertainty of the bolt and nut is characterized in combination with the tolerance data or measurement data, and the geometric size has an important influence on the assembly accuracy and load distribution of the connection. This process needs to consider the influence of the machining error on the actual connection state.

[0074] In step 203, the uncertainty of the tightening torque is characterized using a probability model and measured data of the torque wrench.

[0075] In the embodiments of the present application, the statistical distribution characteristics of the tightening torque are characterized using the measured data (such as the torque wrench), and the random fluctuations in the installation process are considered.

[0076] In step 204, a parameterized model of the local connection structure of the turbine casing is constructed based on the above-described uncertainty characterization of the material performance, the geometric size and the tightening torque,

[0077] In the embodiments of the present application, the above-described three kinds of uncertainty are comprehensively considered to establish the parameterized finite element model of the local connection structure of the turbine casing.

[0078] In step 205, the uncertainty analysis of the local connection structure of the turbine casing is performed using the parameterized model to realize the uncertainty characterization of the connection stiffness.

[0079] In the embodiments of the present application, the uncertainty analysis is carried out using the parameterized model to calculate the statistical distribution characteristics of the connection stiffness.

[0080] Step 102, a finite element analysis model of the overall turbine casing is established, and a turbine casing structure uncertainty analysis model considering the connection stiffness uncertainty is established according to the connection stiffness uncertainty.

[0081] In the embodiment of the application, the uncertainty of the local connection stiffness is introduced into the finite element analysis model of the overall turbine casing, and various uncertainties of the material performance, geometric size and load of the turbine casing are comprehensively considered to establish the uncertainty analysis model of the overall structure.

[0082] Through this step, the model expansion from the local to the overall is realized, the influence of the uncertainty of the local connection stiffness can be reflected in the overall structure performance, the problem that the local characteristics cannot be integrated into the overall modeling in the traditional analysis is solved, and the accuracy of the overall model is improved.

[0083] Figure 3 The flowchart of the reliability analysis and verification method of the turbine casing connection part considering the uncertainty provided in the embodiment of the application is shown in FIG. 1. Figure 3 As shown in FIG. 1, step 102 further includes:

[0084] Step 301, a finite element analysis model of the overall turbine casing is established according to the actual service conditions and boundary conditions of the turbine casing.

[0085] In the embodiment of the application, the overall finite element analysis model is established according to the service conditions (such as load, temperature, etc.) and boundary conditions of the turbine casing.

[0086] Step 302, the connection stiffness uncertainty is integrated into the finite element analysis model of the overall turbine casing, and the turbine casing structure uncertainty analysis model considering the connection stiffness uncertainty is constructed in combination with the uncertainties of the material performance, geometric size and service load of the turbine casing.

[0087] In the embodiment of the application, the uncertainty of the local connection stiffness is input into the overall model to ensure the embodiment of the local uncertainty in the overall model, and the uncertainties of the material performance, geometric size and load are comprehensively considered to construct the uncertainty analysis model of the overall structure to generate the reliability analysis basis of the overall structure.

[0088] Step 103, the failure mode of the turbine casing connection part is determined based on the turbine casing structure uncertainty analysis model, and the failure function is defined to perform the reliability analysis of the turbine casing structure.

[0089] In the embodiment of the application, the stress state of the turbine casing connection part is analyzed through the uncertainty analysis model, the potential failure mode is identified, and the failure function is defined to convert the failure mode into a quantifiable mathematical expression as the basis for the reliability analysis.

[0090] The reliability analysis is a systematic method for evaluating the ability and probability of a system, component or product to operate reliably under certain conditions for a certain period of time. It aims to determine the performance and life of the system under predetermined conditions, identify possible failure modes and their causes, and provide the basis for design, testing and maintenance.

[0091] Through this step, a clear criterion is provided for reliability analysis, the problem of failure mode fuzzification in traditional failure analysis is solved, and the reliability of the overall structure of the turbine casing is quantitatively evaluated.

[0092] Figure 4 A flowchart of a reliability analysis and verification method for a turbine casing connection part considering uncertainty provided by an embodiment of the present application is shown in FIG. 1. As shown in FIG. 1, step 103 further includes: Figure 4

[0093] Step 401: According to the turbine casing uncertainty analysis model, the stress state of the turbine casing connection part is analyzed, and the failure mode is determined.

[0094] In the embodiment of the present application, the stress state of the connection part is analyzed according to the overall turbine casing uncertainty analysis model, and the potential failure mode is identified.

[0095] Step 402: Define the failure function, convert the failure mode of the turbine casing connection part into the standard of reliability analysis, and then perform the reliability analysis of the turbine casing structure.

[0096] In the embodiment of the present application, the failure function is defined, the failure mode (e.g., the life is less than a certain set value) of the turbine casing connection part is converted into the standard of reliability analysis, so as to carry out the reliability analysis of the turbine casing structure.

[0097] Step 104: According to the finite element analysis result of the turbine casing, the stress state of the connection part and the force characteristics of the bolt are extracted, and the characteristic simulation piece of the connection part is designed.

[0098] In the embodiment of the present application, the stress state of the connection part, the force characteristics of the bolt and other data are extracted, and the characteristic simulation piece is designed according to the principles of geometric similarity, stress distribution consistency and bolt force characteristics consistency, so as to simulate the actual service condition in the experiment.

[0099] Figure 5 A flowchart of a reliability analysis and verification method for a turbine casing connection part considering uncertainty provided by an embodiment of the present application is shown in FIG. 1. As shown in FIG. 1, step 103 further includes: Figure 5

[0100] Step 501: According to the finite element analysis result of the turbine casing, the stress state of the connection part and the force characteristics of the bolt are extracted.​​

[0101] In the embodiment of the present application, the stress state of the connecting part and the force characteristics of the bolt are extracted by using the finite element analysis results. The stress state refers to the stress distribution of the connecting part under service conditions, including the maximum stress position, stress concentration area and stress variation law; the force characteristics of the bolt include the preload, tensile force, shear force and other load characteristics of the bolt under loading conditions.

[0102] In step 502, a characteristic simulation piece for simulating the connecting part of the turbine casing is designed based on the principles of geometric similarity, stress distribution consistency and bolt force characteristics consistency.

[0103] In the embodiment of the present application, the characteristic simulation piece for simulating the connecting part of the turbine casing is designed based on the principles of geometric similarity, stress distribution consistency and bolt force characteristics consistency, so as to reproduce the actual service conditions of the connecting part in the experimental verification.

[0104] In step 105, the characteristic simulation piece of the turbine casing connecting part is processed, and the fatigue test is carried out on the processed characteristic simulation piece to obtain the dispersion of the fatigue life data.

[0105] In the embodiment of the present application, according to the design results in step 104, a batch of characteristic simulation pieces are processed, the geometric dimensions and material properties are measured, and the tightening torque during connection is recorded.

[0106] In addition, the fatigue test is carried out on the processed characteristic simulation piece to obtain the dispersion of the fatigue life data, so as to represent the actual life distribution characteristics of the connecting part

[0107] In step 106, the finite element analysis results of the processed characteristic simulation piece of the turbine casing are obtained, and the processed characteristic simulation piece is verified in combination with the dispersion of the fatigue life data.

[0108] In the embodiment of the present application, according to the measured and recorded data and the connection stiffness uncertainty obtained in step 101, and then according to the results of the turbine casing structure reliability analysis considering the connection stiffness uncertainty in steps 102 and 103, the finite element analysis results of the processed characteristic simulation piece of the turbine casing are obtained.

[0109] Finally, the finite element analysis results of the processed characteristic simulation piece are combined with the fatigue life test results to verify and calibrate the reliability analysis model of the overall turbine casing structure, so as to ensure that the model accurately represents the uncertainty of the connecting stiffness of the turbine casing, and to improve the accuracy of the structure reliability analysis.

[0110] In addition, in order to verify the effect of the embodiment of the present application, an example is provided as follows.

[0111] Embodiment 1

[0112] (1) Take the dangerous connection part of the inner ring of the high-pressure turbine rear casing as an example. First, establish a connection stiffness uncertainty characterization method for the local connection structure of the turbine casing. By analyzing the uncertainty of the geometric size, material properties and tightening torque of the connection structure, determine the probability distribution model (such as normal distribution, Weibull distribution, etc.) respectively, which lays the foundation for subsequent model establishment.

[0113] (2) Based on the connection stiffness uncertainty characterization of the high-pressure turbine rear casing inner ring connection part shown above, combined with the uncertainty of the material properties, geometric size and service load of the high-pressure turbine rear casing, establish a turbine casing structure uncertainty analysis model. This model fully considers the diversity of connection stiffness, and integrates different material property data and potential geometric deformation characteristics, further improving the analysis accuracy.

[0114] (3) Turbine casing local dangerous part calculation and simulation part design method:

[0115] I. Import the geometric model of the high-pressure turbine rear casing into the finite element calculation software, determine the load condition and material parameters, apply the load and set the constraint conditions. Divide the mesh and perform mesh independence test to ensure the calculation accuracy.

[0116] II. According to the geometric similarity principle in the simulation part design criteria, design the simulation part geometric model containing the geometric characteristics of the whole casing connection part (such as Figure 6 shown), which is an assembly containing bolt connection. The simulation part design fully considers the stress characteristics of the bolt connection, adopts the compression test piece form, and optimizes the structure to facilitate processing and testing. Through parameterized design, simplify the modeling process and reserve the model iteration window.

[0117] III. After completing the simulation part design, set the friction contact (friction coefficient is 0.1) between the bolt, lug and support plate in the finite element analysis, and perform mesh refinement on the bolt and lug connection parts. The total number of meshes is 710300. Apply -18000N load in x direction, and apply solid support boundary conditions to the lug clamping end. Calculate the load condition of the bolt cross section.

[0118] The results show that according to the load condition of the bolt cross section, the precise bolt y direction eccentricity can be ignored, the load results of finite element calculation can be well matched with the actual load situation, and it is proved that the simulation part design is reasonable and effective.

[0119] (4) After the simulation part is processed, the geometric dimensions and material properties of the dangerous connection structure of the inner ring of the high-pressure turbine rear casing are measured, and the tightening torque during connection is recorded. Based on the method of step 101, the uncertainty of the connection stiffness is characterized. In combination with the characterization of the connection stiffness uncertainty, the turbine casing structure reliability analysis considering the connection stiffness uncertainty is carried out, and the corresponding finite element calculation result is obtained. For the processed feature simulation part, fatigue test is carried out to obtain the dispersion of fatigue life data, and through the analysis of the dispersion of fatigue life data, the accuracy of the turbine casing structure reliability analysis model considering the connection stiffness uncertainty is verified, which provides effective technical support for the design of the high-pressure turbine rear casing structure.

[0120] In order to realize the above-mentioned embodiments, the application further provides a reliability analysis and verification device for a turbine casing connection part. Figure 7 A structure schematic diagram of a reliability analysis and verification device for a turbine casing connection part considering uncertainty provided by the embodiments of the application is shown in FIG. 1. Figure 7 As shown in the figure, the device comprises:

[0121] A first establishing module 100 is configured to establish a finite element analysis model of a turbine casing local connection structure, and establish an uncertainty analysis model of the turbine casing local connection structure based on the uncertainty characterization of the geometric dimensions, material properties and tightening torque of the connection structure, so as to realize the characterization of the connection stiffness uncertainty.

[0122] A second establishing module 200 is configured to establish a finite element analysis model of the whole turbine casing, and establish a turbine casing structure uncertainty analysis model considering the connection stiffness uncertainty according to the connection stiffness uncertainty.

[0123] A reliability analysis module 300 is configured to determine the failure mode of the turbine casing connection part based on the turbine casing structure uncertainty analysis model, and define a failure function to perform reliability analysis of the turbine casing structure.

[0124] A design module 400 is configured to extract the stress state of the connection part and the force characteristics of the bolt according to the finite element analysis result of the turbine casing, and design a feature simulation part of the connection part based on the stress state and the force characteristics.

[0125] A fatigue test module 500 is configured to process the feature simulation part of the turbine casing connection part, and perform fatigue test on the processed feature simulation part to obtain the dispersion of fatigue life data.

[0126] A verification module 600 is configured to obtain the finite element analysis result of the turbine casing of the processed feature simulation part, and verify the processed feature simulation part in combination with the dispersion of fatigue life data.

[0127] To achieve the above-mentioned embodiments, the present application further provides an electronic device, comprising: a processor, and a memory connected with the processor in communication; the memory stores computer execution instructions; the processor executes the computer execution instructions stored in the memory to realize the method provided by the foregoing embodiments.

[0128] To achieve the above-mentioned embodiments, the present application further provides a computer readable storage medium, wherein the computer readable storage medium stores computer execution instructions, and the computer execution instructions are executed by a processor to realize the method provided by the foregoing embodiments.

[0129] To achieve the above-mentioned embodiments, the present application further provides a computer program product, comprising a computer program, wherein the computer program is executed by a processor to realize the method provided by the foregoing embodiments.

[0130] The collection, storage, use, processing, transmission, provision and disclosure of user personal information involved in the present application comply with relevant laws and regulations and do not violate public order and good customs.

[0131] It should be noted that the personal information from the user should be collected for legal and reasonable purposes, and should not be shared or sold outside these legal uses. In addition, such collection / sharing should be carried out after the user's informed consent is received, including but not limited to informing the user to read the user agreement / user notice before the user uses the function, and signing the agreement / authorization including authorization of relevant user information. In addition, any necessary steps should be taken to protect and ensure access to such personal information data, and to ensure that other people with access to personal information data comply with their privacy policy and processes.

[0132] The present application is expected to provide embodiments in which the user can selectively prevent the use or access of personal information data. That is, the present disclosure is expected to provide hardware and / or software to prevent or block access to such personal information data. Once the personal information data is no longer needed, the risk is minimized by limiting data collection and deleting data. In addition, such personal information is de-identified, as applicable, to protect the privacy of the user.

[0133] In the foregoing detailed description, reference is made to descriptive terms such as "one embodiment", "some embodiments", "an example", "a specific example" or "some examples" etc. for describing various embodiments of the application. These descriptive terms are used for the purpose of the description and are not meant to limit or restrict the scope of the application. The use of these terms does not imply that the application is comprised of at least the described embodiments, or that the described embodiments are the only embodiments the application is comprised of. The scope of the application is not limited to the described embodiments, but is rather defined by the appended claims. In the description of the embodiments of the application, reference is made to the terms "one embodiment", "some embodiments", "an example", "a specific example" or "some examples" etc. which are meant to describe a particular feature, structure, material or characteristic included in at least one embodiment of the application. The illustrative description of these terms does not imply that the application is comprised of at least the described embodiments or that the described embodiments are the only embodiments the application is comprised of. In the description of the embodiments of the application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example described previously. Moreover, the described features, structures, materials or characteristics can be combined in any suitable manner in one or more embodiments or examples of the application. Furthermore, the described embodiments or examples of the application and the features thereof can be combined and combined in any suitable manner, without contradicting each other, by those skilled in the art.

[0134] Furthermore, the terms "first", "second", etc. are used herein only to describe a certain feature, structure, material, etc. and do not imply or suggest relative importance or a number of the indicated technical features. Thus, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "a plurality" is at least two, for example two, three, etc., unless otherwise explicitly specified.

[0135] Any process or method descriptions or descriptions of the flow diagrams described herein or otherwise described in this application can be understood as representing the steps of a method or process, including a computer program in which the functions of the steps are performed by executable instructions. The preferred embodiments of this application include additional implementations in which the steps of the method or process are performed by a computer program that is executed by a computer or a processor. The program instructions can be stored on a computer-readable medium that can be accessed by a computer or a processor. The described processes or methods can be performed by one or more computers or processors that form part of a computing device, which execute instructions, process data, receive data, transmit data, or a combination thereof. The computer or processor can include special purpose logic, memory to change the execution of instructions, or a combination of both. Any process or method described in this application can be understood as representing a module, segment, or portion of code that comprises one or more executable instructions for implementing the specified logic function or process. The scope of the preferred embodiments of this application includes additional implementations in which the functions of the steps are performed by a computer program that is executed by a computer or a processor.

[0136] The logic and / or steps represented in the flowcharts and / or described herein, for example, can be considered as a sequence of instructions to implement logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, apparatus, or device, such as a computer-based system, processor- based system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For purposes of this specification, a "computer-readable medium" can be any apparatus that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. The computer-readable medium can be a computer- readable storage medium or a computer-readable signal medium. The computer- readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium include the following: an electrical connection having one or more wires (electrical connections), a portable computer diskette (a magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, and a portable compact disc read-only memory (CDROM). In addition, the computer-readable medium can even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, for example, via optical scanning of the paper or other medium, then compiled, interpreted, or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.

[0137] It should be understood that aspects of the application can be implemented in hardware, software, firmware or combinations thereof. In the above embodiments, various steps or methods can be implemented in software or firmware that is stored in memory and executed by a suitable instruction execution system. As such, in some embodiments, specifically configured hardware can be used to implement at least some of the functionality described herein. For example, if implemented in hardware, the hardware can include any or a combination of the following: a discrete logic circuit having logic gates for implementing logic functions upon data signals, an application specific integrated circuit having appropriate combinational logic gates, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0138] Those of skill in the art would understand that information and signals can be represented using any of a variety of technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that can be referenced throughout the above description can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0139] In addition, each of the function units in each embodiment of the present application can be integrated in one processing module, or each unit can be physically present separately, or two or more units can be integrated in one module. The integrated module can be realized in the form of hardware or in the form of a software function module. When the integrated module is realized in the form of a software function module and sold or used as an independent product, it can also be stored in a computer readable storage medium.

[0140] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

[0141] It should be understood that the various forms of flow shown above can be reordered, added or deleted steps. For example, each step described in the present application can be executed in parallel, sequentially or in different order, as long as the desired results of the technical solutions of the present application can be achieved, which is not limited herein.

[0142] The above detailed description does not constitute a limitation on the scope of protection of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and replacements can be made according to design requirements and other factors. Any modifications, equivalent replacements and improvements within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A method for reliability analysis and verification of turbine casing connection parts considering uncertainties, characterized in that, Includes the following steps: A finite element analysis model of the local connection structure of the turbine casing is established, and an uncertainty analysis model of the local connection structure of the turbine casing is established based on the uncertainty characterization of the geometric dimensions, material properties and tightening torque of the connection structure, so as to realize the characterization of the uncertainty of the connection stiffness. A finite element analysis model of the overall turbine casing is established. Based on the connection stiffness uncertainty, a structural uncertainty analysis model of the turbine casing considering the connection stiffness uncertainty is established. Based on the uncertainty analysis model of the turbine casing structure, the failure modes of the turbine casing connection parts are determined, and the failure function is defined to conduct reliability analysis of the turbine casing structure. Based on the finite element analysis results of the turbine casing, the stress state of the connection part and the force characteristics of the bolts are extracted, and the characteristic simulation parts of the connection part are designed accordingly. A simulated feature part of the turbine casing connection area is machined, and fatigue tests are conducted on the machined simulated feature part to obtain the dispersion of fatigue life data; The finite element analysis results of the turbine casing of the machined feature simulation part are obtained, and the machined feature simulation part is verified by combining the dispersion of the fatigue life data.

2. The method according to claim 1, characterized in that, The finite element analysis model of the turbine casing's partial connection structure is established, and an uncertainty analysis model of the turbine casing's partial connection structure is established based on the uncertainty characterization of the connection structure's geometric dimensions, material properties, and tightening torque. This achieves the characterization of the connection stiffness uncertainty, including: The uncertainty of the material properties of the connection parts is characterized using probabilistic models and existing material property data, wherein the uncertainty of the material properties includes the uncertainty of the elastic modulus and Poisson's ratio of the bolts and nuts; The uncertainty of the geometric dimensions of the connection is characterized using probabilistic models and tolerance or measurement data of the geometric dimensions, wherein the uncertainty of the geometric dimensions includes the uncertainty of the geometric tolerances of the bolts and nuts; The uncertainty of tightening torque is characterized using a probabilistic model and measured data from a torque wrench; Based on the aforementioned uncertainty characterization of material properties, geometric dimensions, and tightening torque, a parametric model of the turbine casing local connection structure is constructed. The aforementioned parametric model is used to perform uncertainty analysis on the local connection structure of the turbine casing, thereby characterizing the uncertainty of the connection stiffness.

3. The method according to claim 2, characterized in that, The establishment of the finite element analysis model of the overall turbine casing, based on the connection stiffness uncertainty, includes establishing a turbine casing structural uncertainty analysis model considering the connection stiffness uncertainty, including: Based on the actual service conditions and boundary conditions of the turbine casing, a finite element analysis model of the entire turbine casing is established. The connection stiffness uncertainty is incorporated into the overall finite element analysis model of the turbine casing, and combined with the uncertainties of the turbine casing's material properties, geometric dimensions, and service loads, a structural uncertainty analysis model of the turbine casing considering the connection stiffness uncertainty is constructed.

4. The method according to claim 3, characterized in that, The determination of failure modes at turbine casing connection points based on the turbine casing structure uncertainty analysis model, and the definition of failure function functions for reliability analysis of the turbine casing structure, includes: Based on the aforementioned turbine casing uncertainty analysis model, the stress state of the turbine casing connection points is analyzed, and the failure mode is determined. The failure function is defined to transform the failure modes of the turbine casing connection into the standard for reliability analysis, and then the reliability analysis of the turbine casing structure is carried out.

5. The method according to claim 4, characterized in that, Based on the finite element analysis results of the turbine casing, the stress state of the connection area and the force characteristics of the bolts are extracted, and the characteristic simulation parts of the connection area are designed accordingly, including: Based on the finite element analysis results of the turbine casing, the stress state of the connection parts and the force characteristics of the bolts are extracted; Based on the principles of geometric similarity, consistent stress distribution, and consistent bolt stress characteristics, a characteristic simulation component was designed to simulate the connection part of the turbine casing.

6. The method according to claim 5, characterized in that, The acquisition of the finite element analysis results of the turbine casing of the simulated feature component being processed includes: Measure the geometric dimensions and material properties of the processed feature simulation part, and record the tightening torque during connection; Based on the measurement and recorded data, the finite element analysis results of the turbine casing of the machined feature simulation part were determined.

7. A device for reliability analysis and verification of turbine casing connection parts considering uncertainties, characterized in that, include: The first module is used to establish a finite element analysis model of the local connection structure of the turbine casing, and to establish an uncertainty analysis model of the local connection structure of the turbine casing based on the uncertainty characterization of the geometric dimensions, material properties and tightening torque of the connection structure, so as to realize the characterization of the uncertainty of the connection stiffness. The second module is used to establish a finite element analysis model of the overall turbine casing. Based on the connection stiffness uncertainty, a turbine casing structural uncertainty analysis model considering the connection stiffness uncertainty is established. The reliability analysis module is used to determine the failure modes of the turbine casing connection parts based on the turbine casing structure uncertainty analysis model, and to define the failure function to perform reliability analysis of the turbine casing structure. The design module is used to extract the stress state of the connection and the force characteristics of the bolts based on the finite element analysis results of the turbine casing, and to design the characteristic simulation parts of the connection. The fatigue testing module is used to process characteristic simulation parts of the turbine casing connection area, and to conduct fatigue tests on the processed characteristic simulation parts to obtain the dispersion of fatigue life data. The verification module is used to obtain the finite element analysis results of the turbine casing of the processed feature simulation part, and to verify the processed feature simulation part by combining the dispersion of the fatigue life data.

8. An electronic device, characterized in that, include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory to implement the method as described in any one of claims 1-6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method as described in any one of claims 1-6.

10. A computer program product, characterized in that, Includes a computer program that, when executed by a processor, implements the method of any one of claims 1-6.

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