Turbine case connection part reliability analysis and verification method considering uncertainty

Abstract

The invention provides a turbine case connection part reliability analysis and verification method considering uncertainty, and the method comprises the steps: building a finite element analysis model of a local connection structure of a turbine case, and achieving the representation of the uncertainty of connection rigidity; establishing a turbine casing structure uncertainty analysis model considering the connection rigidity uncertainty; determining a failure mode of the turbine case connecting part, defining a failure performance function, and performing reliability analysis on the turbine case structure; according to the finite element analysis result of the turbine case, designing a feature simulation piece of the connection part; processing a characteristic simulation part of the turbine case connecting part and carrying out a fatigue test; and obtaining a finite element analysis result of the turbine case of the processed characteristic simulation piece, and verifying the processed characteristic simulation piece in combination with the dispersibility of the fatigue life data. According to the method, the precision and engineering of the reliability analysis of the connection part of the turbine case are realized, and the precision of reliability evaluation is improved.

Description

Technical Field

[0001] The present application relates to the technical field of reliability research of turbine casings, and in particular to a reliability analysis and verification method of turbine casing connection parts taking uncertainty into consideration. Background Art

[0002] The turbine case is a key component in an aircraft engine. Its main function is to support the turbine assembly and guide the airflow. Its design requirements not only require it to withstand high temperatures, high pressures, and high mechanical loads, but also ensure the coordination and stable operation of various components during flight. Therefore, the structural reliability of the turbine case is crucial to the overall performance and safety of the engine.

[0003] In the current status of the research on reliability analysis and verification methods of turbine casing structures considering the uncertainty of connection stiffness, 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 loads. At the same time, uncertainty analysis has become a hot topic, and researchers use sensitivity analysis and uncertainty propagation analysis to identify key factors affecting connection reliability. In terms of experimental research, the testing of connection strength is also deepening. Scholars conduct experiments such as static loading, fatigue and environmental simulation to establish the reliability of connection parts under different conditions. In addition, structural health monitoring (SHM) technology is gradually being applied to monitor the connection status in real time and predict the risk of failure. In terms of the application of computer simulation, finite element analysis (FEA) has become the main means of connection reliability analysis. Researchers establish a high-precision model of the turbine casing connection to evaluate its stress and deformation under complex loads.

[0004] Existing experimental and computational data show that the turbine casing connection is one of the most critical and dangerous parts of the entire turbine casing. This part is subjected to huge mechanical stress and thermal load as well as extreme aerodynamic conditions. Under such complex working conditions, the uncertainty of the connection stiffness of the turbine casing has a significant impact on the fatigue life of the entire casing. These uncertain factors may not only lead to a decline in equipment performance, but may also cause more serious safety hazards. Therefore, it is necessary to conduct a systematic reliability analysis and verification of the uncertainty of the connection stiffness 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 conducting reliability analysis on the turbine casing, it is very important to establish a turbine casing structural uncertainty analysis model that takes into account the uncertainty of the connection stiffness.

[0005] In order to establish a turbine casing structural uncertainty analysis model, it is necessary to create a characterization method for the uncertainty of turbine casing connection stiffness. However, there is a lack of research on the characterization of turbine casing connection stiffness uncertainty at home and abroad, and a mature and effective uncertainty characterization method has not been formed. Summary of the invention

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

[0007] To this end, the first objective of the present application is to propose a reliability analysis and verification method for turbine casing connection parts taking uncertainty into account.

[0008] The second objective of the present application is to propose a reliability analysis and verification device for turbine casing connection parts taking uncertainty into account.

[0009] The third objective of the present application is to provide an electronic device.

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

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

[0012] To achieve the above-mentioned purpose, the first embodiment of the present application proposes a reliability analysis and verification method of a turbine casing connection part considering uncertainty, including:

[0013] Establish a finite element analysis model of the local connection structure of the turbine casing, and 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 to achieve the characterization of the uncertainty of the connection stiffness;

[0014] Establishing a finite element analysis model of the entire turbine casing, and establishing a turbine casing structural uncertainty analysis model that takes into account the connection stiffness uncertainty according to the connection stiffness uncertainty;

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

[0016] 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 based on them;

[0017] Processing characteristic simulation parts of the turbine casing connection part, carrying out fatigue tests on the processed characteristic simulation parts, and obtaining the dispersion of fatigue life data;

[0018] The finite element analysis result of the turbine casing of the processed characteristic simulation part is obtained, and the processed characteristic simulation part is verified in combination with the dispersion of the fatigue life data.

[0019] Optionally, the finite element analysis model of the local connection structure of the turbine casing is established, and the 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 to achieve the characterization of the uncertainty of the connection stiffness, including:

[0020] Characterizing the uncertainty of material properties of the connection parts using a probabilistic model and existing material property data, wherein the uncertainty of the material properties includes the uncertainty of elastic modulus and Poisson's ratio of the bolt and nut;

[0021] Characterizing the uncertainty of geometric dimensions of the connection part using a probability model and tolerance data or measurement data of geometric dimensions, wherein the uncertainty of the geometric dimensions includes the uncertainty of geometric tolerances of bolts and nuts;

[0022] The uncertainty of tightening torque is characterized using probabilistic models and measured data of torque wrenches;

[0023] Based on the uncertainty characterization of the above-mentioned material properties, geometric dimensions and tightening torque, a parametric model of the local connection structure of the turbine casing is constructed;

[0024] The parameterized model is used to perform uncertainty analysis on the local connection structure of the turbine casing, thereby achieving uncertainty characterization of the connection stiffness.

[0025] Optionally, the establishing of the finite element analysis model of the entire turbine casing, based on the connection stiffness uncertainty, establishing a turbine casing structural uncertainty analysis model that takes into account the connection stiffness uncertainty, comprises:

[0026] According to the actual service conditions and boundary conditions of the turbine casing, a finite element analysis model of the entire turbine casing is established;

[0027] The connection stiffness uncertainty is integrated into the overall finite element analysis model of the turbine casing, and combined with the uncertainty of the material properties, geometric dimensions and service loads of the turbine casing, a turbine casing structural uncertainty analysis model that takes into account the connection stiffness uncertainty is constructed.

[0028] Optionally, determining the failure mode of the turbine casing connection part based on the turbine casing structure uncertainty analysis model and defining the failure function to perform reliability analysis of the turbine casing structure include:

[0029] Analyzing the stress state of the connection part of the turbine casing according to the uncertainty analysis model of the turbine casing, and determining the failure mode;

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

[0031] Optionally, the extracting of the stress state of the connection part and the force characteristics of the bolts according to the finite element analysis results of the turbine casing, and designing the characteristic simulation parts of the connection part based on the extracted stress state of the connection part and the force characteristics of the bolts, comprises:

[0032] Extracting the stress state of the connection part and the force characteristics of the bolts according to the finite element analysis results of the turbine casing;

[0033] Based on the principles of geometric similarity, consistency of stress distribution and consistency of bolt force characteristics, a characteristic simulation part is designed to simulate the connection part of the turbine casing.

[0034] Optionally, the obtaining of a finite element analysis result of a turbine casing of the processed characteristic simulation part includes:

[0035] Measuring the geometrical dimensions and material properties of the processed characteristic simulation parts, and recording the tightening torque during connection;

[0036] Based on the measured data and the recorded data, the finite element analysis results of the turbine casing of the machined feature simulation part are determined.

[0037] To achieve the above-mentioned purpose, the second embodiment of the present application proposes a reliability analysis and verification device for a turbine casing connection part taking uncertainty into consideration, comprising:

[0038] The first establishment module is used to establish a finite element analysis model of the local connection structure of the turbine casing, and 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 achieve the characterization of the uncertainty of the connection stiffness;

[0039] The second establishment module is used to establish a finite element analysis model of the entire turbine casing, and according to the connection stiffness uncertainty, establish a turbine casing structural uncertainty analysis model that takes into account the connection stiffness uncertainty;

[0040] A reliability analysis module, used to determine the failure mode of the turbine casing connection part based on the turbine casing structure uncertainty analysis model, and define the failure function to perform reliability analysis of the turbine casing structure;

[0041] The design module is used to extract the stress state of the connection part 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 part based on them;

[0042] A fatigue test module is used to process characteristic simulation parts of the turbine casing connection part, and to carry out fatigue tests on the processed characteristic simulation parts to obtain the dispersion of fatigue life data;

[0043] The verification module is used to obtain the finite element analysis result of the turbine casing of the processed characteristic simulation part, and verify the processed characteristic simulation part in combination with the dispersion of the fatigue life data.

[0044] To achieve the above-mentioned purpose, the third aspect of the present application provides an electronic device, including: a processor, and a memory communicatively connected to the processor;

[0045] The memory stores computer-executable instructions;

[0046] The processor executes the computer-executable instructions stored in the memory to implement the method as described in any one of the first aspects.

[0047] To achieve the above-mentioned purpose, the fourth aspect embodiment of the present application proposes a computer-readable storage medium, in which computer-readable storage medium is stored computer execution instructions, and when the computer execution instructions are executed by a processor, they are used to implement the method as described in any one of the first aspects.

[0048] To achieve the above-mentioned purpose, the fifth aspect of the present application proposes a computer program product, which implements any method in the first aspect when executed by a processor.

[0049] The technical solution provided by the embodiments of the present application brings at least the following beneficial effects:

[0050] This application establishes a method for characterizing the uncertainty of the turbine casing connection stiffness, thereby achieving accurate analysis of the performance and failure modes of the local connection parts of the turbine casing under complex working conditions, avoiding the deviation in analysis results caused by insufficient research on the uncertainty of connection stiffness in traditional methods, and improving the reliability and accuracy of the performance prediction of the connection parts. By proposing a finite element analysis model of the local connection structure of the turbine casing and an 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, this application combines numerical simulation with fatigue testing, and through the design verification scheme and reliability analysis steps, realizes a closed-loop process from theoretical analysis to experimental verification, avoiding the limitation that a single method is difficult to accurately evaluate the connection performance and life, and improving the consistency between the model results and the actual working conditions. This method can identify the potential failure modes of the turbine casing connection, evaluate the failure risks caused by uncertain factors (such as material properties, geometric dimensions and tightening torque), and thus reduce the overall failure risk caused by failure of the connection.

[0052] In general, by comprehensively considering the uncertainty of the connection parts under the complex working environment of aircraft engines (such as high temperature, high stress and fatigue load), this application can more accurately evaluate the performance and life of the turbine casing connection parts, and provide important technical support for the design of long-life, high-reliability engine structures, ultimately improving the overall safety and reliability of aircraft engines, and providing a scientific basis for flight safety and engineering design optimization.

[0053] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0055] Figure 1 A schematic flow chart of a reliability analysis and verification method for a turbine casing connection part taking uncertainty into consideration provided in an embodiment of the present application;

[0056] Figure 2 A schematic flow chart of a reliability analysis and verification method for a turbine casing connection part taking uncertainty into consideration provided in an embodiment of the present application;

[0057] Figure 3 A schematic flow chart of a reliability analysis and verification method for a turbine casing connection part taking uncertainty into consideration provided in an embodiment of the present application;

[0058] Figure 4 A schematic flow chart of a reliability analysis and verification method for a turbine casing connection part taking uncertainty into consideration provided in an embodiment of the present application;

[0059] Figure 5 A schematic flow chart of a reliability analysis and verification method for a turbine casing connection part taking uncertainty into consideration provided in an embodiment of the present application;

[0060] Figure 6 A schematic diagram of a turbine rear casing inner ring connection simulation component provided in an embodiment of the present application;

[0061] Figure 7 A schematic diagram of the structure of a reliability analysis and verification device for a turbine casing connection part taking uncertainty into consideration provided in an embodiment of the present application. DETAILED DESCRIPTION

[0062] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0063] At present, domestic research on the reliability of turbine casings usually focuses on their overall analysis, and research data that considers connection uncertainty is relatively scarce, while the safety of aircraft engines is crucial to flight safety. To address this issue, an embodiment of the present application provides a reliability analysis and verification method for turbine casing connection parts that considers uncertainty. By conducting an in-depth analysis of the reliability of turbine casing connection parts, potential failure modes can be identified and understood, reducing the risk of failure caused by connection uncertainty, thereby improving overall safety and reliability. In the actual working environment of aircraft engines, connection parts are affected by many factors, such as temperature, stress, and fatigue. Considering these uncertain factors helps to more comprehensively evaluate connection performance and life, thereby providing engineers with more accurate information to make more reasonable design and maintenance decisions.

[0064] Figure 1 A flow chart of a reliability analysis and verification method for a turbine casing connection part considering uncertainty provided in an embodiment of the present application. Figure 1 As shown, the method comprises the following steps:

[0065] Step 101, establish a finite element analysis model of the local connection structure of the turbine casing, and 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 to achieve the characterization of the uncertainty of the connection stiffness.

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

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

[0068] This step lays the foundation for subsequent reliability analysis, improves the accuracy of the analysis by quantifying uncertainty factors, and solves the model deviation problem caused by multi-source uncertainty in the connection stiffness characterization process.

[0069] Figure 2 A flow chart of a reliability analysis and verification method for a turbine casing connection part considering uncertainty provided in an embodiment of the present application is shown in FIG. Figure 2 As shown, step 101 also includes:

[0070] Step 201 , using a probability model and existing material property data to characterize the uncertainty of material properties of a connection part, wherein the uncertainty of material properties includes the uncertainty of elastic modulus and Poisson's ratio of bolts and nuts.

[0071] In the embodiments of the present application, a probability model and material property data are used to characterize the uncertainty of the elastic modulus and Poisson's ratio of the connection part.

[0072] Step 202 : using a probability model and tolerance data or measurement data of geometric dimensions to characterize the uncertainty of geometric dimensions of the connection part, wherein the uncertainty of geometric dimensions includes the uncertainty of geometric tolerances of bolts and nuts.

[0073] In the embodiments of the present application, the geometric tolerance uncertainty of the bolts and nuts is characterized by combining tolerance data or measurement data. The geometric dimensions have an important influence on the assembly accuracy and load distribution of the connection. The process needs to consider the influence of the processing error on the actual connection state.

[0074] Step 203: Use the probability model and the torque wrench measured data to characterize the uncertainty of the tightening torque.

[0075] In the embodiments of the present application, measured data (such as torque wrench) is used to characterize the statistical distribution characteristics of the tightening torque, taking into account random fluctuations during the installation process.

[0076] Step 204: Based on the uncertainty representations of the material properties, geometric dimensions and tightening torque, a parameterized model of the local connection structure of the turbine casing is constructed.

[0077] In the embodiment of the present application, the above three uncertainties are combined to establish a parametric finite element model of the local connection structure of the turbine casing.

[0078] Step 205 , using the parameterized model to perform uncertainty analysis on the local connection structure of the turbine casing, to achieve uncertainty characterization of the connection stiffness.

[0079] In the embodiment of the present application, a parameterized model is used to carry out uncertainty analysis and calculate the statistical distribution characteristics of the connection stiffness.

[0080] Step 102, establishing a finite element analysis model of the entire turbine casing, and establishing a turbine casing structural uncertainty analysis model that takes into account the uncertainty of the connection stiffness according to the uncertainty of the connection stiffness.

[0081] In an embodiment of the present application, the uncertainty of the local connection stiffness is introduced into the finite element analysis model of the entire turbine casing, and the uncertainty analysis model of the overall structure is established by comprehensively considering the various uncertainties of the material properties, geometric dimensions and loads of the turbine casing.

[0082] Through this step, the model is expanded from local to global, so that the uncertainty effect of local connection stiffness can be reflected in the overall structural performance, solving the problem that local characteristics cannot be integrated into overall modeling in traditional analysis and improving the accuracy of the overall model.

[0083] Figure 3 A flow chart of a reliability analysis and verification method for a turbine casing connection part considering uncertainty provided in an embodiment of the present application is shown in FIG. Figure 3 As shown, step 102 also includes:

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

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

[0086] Step 302, integrating the connection stiffness uncertainty into the overall finite element analysis model of the turbine casing, and combining the uncertainty of the material properties, geometric dimensions and service loads of the turbine casing to construct a turbine casing structural uncertainty analysis model that takes into account the connection stiffness uncertainty.

[0087] In an embodiment of the present application, the uncertainty of the local connection stiffness is input into the overall model to ensure that the local uncertainty is reflected in the overall model, and the uncertainty of material properties, geometric dimensions and loads is integrated to construct an uncertainty analysis model of the overall structure to generate a reliability analysis basis for the overall structure.

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

[0089] In the embodiment of the present application, an uncertainty analysis model is used to analyze the stress state of the turbine casing connection, identify potential failure modes, and define failure function functions to convert failure modes into quantifiable mathematical expressions as a basis for reliability analysis.

[0090] Reliability analysis is a systematic method used to evaluate the ability and probability of a system, component or product to operate reliably under specific conditions and 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 a basis for design, testing and maintenance.

[0091] This step provides clear criteria for reliability analysis, solves the problem of fuzzy failure modes in traditional failure analysis, and quantitatively evaluates the reliability of the overall structure of the turbine casing.

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

[0093] Step 401 , analyzing the stress state of the connection part of the turbine casing according to the uncertainty analysis model of the turbine casing, and determining the failure mode.

[0094] In the embodiment of the present application, based on the overall turbine casing uncertainty analysis model, the stress state of the connection parts is analyzed to identify potential failure modes.

[0095] Step 402, defining a failure function, converting the failure mode of the turbine casing connection portion into a reliability analysis standard, and then performing a reliability analysis of the turbine casing structure.

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

[0097] Step 104, based on the finite element analysis results of the turbine casing, extract the stress state of the connection part and the force characteristics of the bolts, and use them to design the characteristic simulation parts of the connection part.

[0098] In the embodiments of the present application, data such as the stress state of the connection part and the force characteristics of the bolts are extracted, and characteristic simulation parts are designed based on the principles of geometric similarity, consistency of stress distribution and consistency of bolt force characteristics, so as to simulate actual service conditions in the experiment.

[0099] Figure 5 A flow chart of a reliability analysis and verification method for a turbine casing connection part considering uncertainty provided in an embodiment of the present application is shown in FIG. Figure 5 As shown, step 104 also includes:

[0100] Step 501, extracting the stress state of the connection part and the force characteristics of the bolts according to the finite element analysis results of the turbine casing.

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

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

[0103] In the embodiments of the present application, based on the principles of geometric similarity, consistency of stress distribution, and consistency of bolt force characteristics, characteristic simulation parts are designed to simulate the connection parts of the turbine casing, so as to reproduce the actual service conditions of the connection parts in experimental verification.

[0104] Step 105, processing characteristic simulation parts of the turbine casing connection part, carrying out fatigue tests on the processed characteristic simulation parts, and obtaining the dispersion of fatigue life data.

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

[0106] In addition, fatigue tests are carried out on the processed characteristic simulation parts to obtain the dispersion of fatigue life data, thereby characterizing the actual life distribution characteristics of the connection parts.

[0107] Step 106, obtaining the finite element analysis result of the turbine casing of the processed characteristic simulation part, and verifying the processed characteristic simulation part in combination with the dispersion of fatigue life data.

[0108] In an embodiment of the present application, the connection stiffness uncertainty is obtained based on the measured and recorded data and step 101, and then the turbine casing structure reliability analysis results considering the connection stiffness uncertainty are carried out according to steps 102 and 103, thereby obtaining the turbine casing finite element analysis results of the machined characteristic simulation parts.

[0109] Finally, the finite element analysis results of the machined feature simulation parts are combined with the fatigue life test results to verify and calibrate the reliability analysis model of the overall turbine casing structure to ensure that the model accurately represents the uncertainty of the turbine casing connection stiffness, thereby improving the accuracy of the reliability analysis of the structure.

[0110] In addition, in order to verify the effect of the embodiment of the present application, the present application also proposes an example, as shown below.

[0111] Example 1

[0112] (1) Taking the dangerous connection part of the inner ring of the high-pressure turbine rear casing as an example, the uncertainty characterization method of the connection stiffness of the local connection structure of the turbine casing is first established. By analyzing the uncertainty of the geometric dimensions, material properties and tightening torque of the connection structure, its probability distribution model (such as normal distribution, Weibull distribution, etc.) is determined respectively, laying the foundation for the subsequent model establishment.

[0113] (2) Based on the uncertainty characterization of the connection stiffness of the inner ring connection of the high-pressure turbine rear casing shown above, combined with the uncertainty of the material properties, geometric dimensions and service loads of the high-pressure turbine rear casing, a turbine casing structural uncertainty analysis model is established. This model comprehensively considers the diversity of connection stiffness and integrates different material performance data and potential geometric deformation characteristics to further improve the analysis accuracy.

[0114] (3) Calculation of local dangerous parts of turbine casing and design method of simulation parts:

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

[0116] Ⅱ. According to the geometric similarity principle in the simulation design criteria, design the simulation geometric model including the geometric features of the entire casing connection part (such as Figure 6 The geometric model is an assembly with bolted connections. The simulation part design fully considers the stress characteristics of the bolted connection and adopts the form of a compression test part. At the same time, the structure is optimized for processing and testing. Through parametric design, the modeling process is simplified and a window for model iteration is reserved.

[0117] III. After completing the simulation design, set the friction contact between the bolt, lug and support plate in the finite element analysis (friction coefficient is 0.1), and mesh the connection between the bolt, lug and support plate to a total of 710300 meshes. Apply a load of -18000N in the x direction, and apply a fixed support boundary condition to the clamping end of the lug to calculate the load on the bolt section.

[0118] The results show that according to the loading conditions of the bolt section, the eccentricity of the precision bolt in the y direction can be ignored, and the loading results calculated by finite element method are in good agreement with the actual loading conditions, which proves that the design of the simulation component is reasonable and effective.

[0119] (4) After the simulation parts are 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 respectively, and the tightening torque during connection is recorded. Based on the method of step 101, the uncertainty of the connection stiffness is characterized. Combined with the characterization of the connection stiffness uncertainty, a reliability analysis of the turbine casing structure considering the uncertainty of the connection stiffness is carried out to obtain the corresponding finite element calculation results. For the processed characteristic simulation parts, fatigue tests are carried out to obtain the dispersion of fatigue life data. Through the analysis of the fatigue life dispersion data, the accuracy of the turbine casing structure reliability analysis model considering the uncertainty of the connection stiffness is verified, which provides effective technical support for the design of the high-pressure turbine rear casing structure.

[0120] In order to implement the above-mentioned embodiment, the present application also proposes a reliability analysis and verification device for the connection part of the turbine casing. Figure 7 A schematic diagram of a reliability analysis and verification device for a turbine casing connection part considering uncertainty provided in an embodiment of the present application. Figure 7 As shown, the device comprises:

[0121] The first building module 100 is used to build a finite element analysis model of the local connection structure of the turbine casing, and to build an uncertainty analysis model of the local connection structure of the turbine casing based on uncertainty characterization of geometric dimensions, material properties and tightening torque of the connection structure, so as to realize the characterization of connection stiffness uncertainty;

[0122] The second building module 200 is used to build a finite element analysis model of the entire turbine casing, and to build a turbine casing structural uncertainty analysis model taking into account the connection stiffness uncertainty according to the connection stiffness uncertainty;

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

[0124] The design module 400 is used to extract the stress state of the connection part and the force characteristics of the bolts according to the finite element analysis results of the turbine casing, and design the characteristic simulation parts of the connection part based on them;

[0125] Fatigue test module 500, used to process characteristic simulation parts of turbine casing connection parts, conduct fatigue tests on the processed characteristic simulation parts, and obtain the dispersion of fatigue life data;

[0126] The verification module 600 is used to obtain the finite element analysis results 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] In order to implement the above embodiments, the present application also proposes an electronic device, comprising: a processor, and a memory communicatively connected to the processor; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory to implement the method provided by the above embodiments.

[0128] In order to implement the above embodiments, the present application also proposes a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the methods provided by the above embodiments.

[0129] In order to implement the above embodiments, the present application also proposes a computer program product, including a computer program, which implements the methods provided by the above embodiments when executed by a processor.

[0130] The collection, storage, use, processing, transmission, provision and disclosure of user personal information involved in this application are in compliance with relevant laws and regulations and do not violate public order and good morals.

[0131] It should be noted that personal information from users should be collected for legitimate and reasonable purposes and should not be shared or sold outside of these legitimate uses. In addition, such collection / sharing should be carried out after receiving the user's informed consent, including but not limited to notifying the user to read the user agreement / user notice and sign the agreement / authorization including authorization of relevant user information before the user uses the function. In addition, any necessary steps should be taken to protect and safeguard access to such personal information data and ensure that others who have access to personal information data comply with its privacy policy and procedures.

[0132] The present application is expected to provide an implementation scheme for users to selectively block 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 can be minimized by limiting data collection and deleting the data. In addition, when applicable, such personal information is de-identified to protect the privacy of the user.

[0133] In the description of the aforementioned embodiments, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0134] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0135] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0136] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0137] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0138] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0139] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0140] The storage medium mentioned above may 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 can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

[0141] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this application can be executed in parallel, sequentially or in different orders, as long as the expected results of the technical solution of this application can be achieved, and this document is not limited here.

[0142] The above specific implementations do not constitute a limitation on the protection scope of this application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this application should be included in the protection scope of this application.

Claims

1. A reliability analysis and verification method for turbine casing connection parts considering uncertainty, characterized in that: The following steps are involved: Establish a finite element analysis model of the local connection structure of the turbine casing, and 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 to achieve the characterization of the uncertainty of the connection stiffness; Establishing a finite element analysis model of the entire turbine casing, and establishing a turbine casing structural uncertainty analysis model that takes into account the connection stiffness uncertainty according to the connection stiffness uncertainty; Determining the failure mode of the turbine casing connection part based on the turbine casing structure uncertainty analysis model, and defining the failure function to perform 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 based on them; Processing characteristic simulation parts of the turbine casing connection part, carrying out fatigue tests on the processed characteristic simulation parts, and obtaining the dispersion of fatigue life data; The finite element analysis result of the turbine casing of the processed characteristic simulation part is obtained, and the processed characteristic simulation part is verified in combination with the dispersion of the fatigue life data.

2. The method according to claim 1, characterized in that: The finite element analysis model of the local connection structure of the turbine casing is established, and the 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 to achieve the characterization of the uncertainty of the connection stiffness, including: Characterizing the uncertainty of material properties of the connection parts using a probabilistic model and existing material property data, wherein the uncertainty of the material properties includes the uncertainty of elastic modulus and Poisson's ratio of the bolt and nut; Characterizing the uncertainty of geometric dimensions of the connection part using a probability model and tolerance data or measurement data of geometric dimensions, wherein the uncertainty of the geometric dimensions includes the uncertainty of geometric tolerances of bolts and nuts; The uncertainty of tightening torque is characterized using probabilistic models and measured data of torque wrenches; Based on the uncertainty characterization of the above-mentioned material properties, geometric dimensions and tightening torque, a parametric model of the local connection structure of the turbine casing is constructed; The parameterized model is used to perform uncertainty analysis on the local connection structure of the turbine casing, thereby achieving uncertainty characterization of the connection stiffness.

3. The method according to claim 2, characterized in that The method of establishing a finite element analysis model of the entire turbine casing and establishing a turbine casing structural uncertainty analysis model taking into account the uncertainty of the connection stiffness according to the uncertainty of the connection stiffness comprises: According to 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 integrated into the overall finite element analysis model of the turbine casing, and combined with the uncertainty of the material properties, geometric dimensions and service loads of the turbine casing, a turbine casing structural uncertainty analysis model that takes into account the connection stiffness uncertainty is constructed.

4. The method according to claim 3, characterized in that: The method of determining the failure mode of the turbine casing connection part based on the turbine casing structure uncertainty analysis model and defining the failure function to perform reliability analysis of the turbine casing structure includes: Analyzing the stress state of the connection part of the turbine casing according to the uncertainty analysis model of the turbine casing, and determining the failure mode; The failure function is defined, and the failure mode of the turbine casing connection is converted into the reliability analysis standard, and then the reliability analysis of the turbine casing structure is carried out.

5. The method according to claim 4, characterized in that The method of extracting the stress state of the connection part and the force characteristics of the bolts according to the finite element analysis results of the turbine casing and designing the characteristic simulation parts of the connection part includes: Extracting the stress state of the connection part and the force characteristics of the bolts according to the finite element analysis results of the turbine casing; Based on the principles of geometric similarity, consistency of stress distribution and consistency of bolt force characteristics, a characteristic simulation part is designed to simulate the connection part of the turbine casing.

6. The method according to claim 5, characterized in that The step of obtaining the finite element analysis result of the turbine casing of the processed characteristic simulation part comprises: Measuring the geometrical dimensions and material properties of the processed characteristic simulation parts, and recording the tightening torque during connection; Based on the measured data and the recorded data, the finite element analysis results of the turbine casing of the machined feature simulation part are determined.

7. A reliability analysis and verification device for turbine casing connection parts considering uncertainty, characterized in that: include: The first establishment module is used to establish a finite element analysis model of the local connection structure of the turbine casing, and 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 achieve the characterization of the uncertainty of the connection stiffness; The second establishment module is used to establish a finite element analysis model of the entire turbine casing, and according to the connection stiffness uncertainty, establish a turbine casing structural uncertainty analysis model that takes into account the connection stiffness uncertainty; A reliability analysis module, used to determine the failure mode of the turbine casing connection part based on the turbine casing structure uncertainty analysis model, and 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 part 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 part based on them; A fatigue test module is used to process characteristic simulation parts of the turbine casing connection part, and to carry out 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 result of the turbine casing of the processed characteristic simulation part, and verify the processed characteristic simulation part in combination with 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-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the method according to any one of claims 1 to 6.

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

10. A computer program product, characterized in that The invention comprises a computer program, which implements the method according to any one of claims 1 to 6 when being executed by a processor.

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