Cutter head fatigue life calculation method and system, electronic equipment and storage medium

Abstract

The invention discloses a cutterhead fatigue life calculation method and system, electronic equipment and a storage medium, and the method comprises the steps: dividing a cutterhead construction process into a plurality of working conditions according to geological parameters, sequentially carrying out discrete element simulation analysis and finite element simulation analysis for each working condition, and obtaining a finite element simulation result of each sub-model under the working condition; therefore, the fatigue damage value of each cutter and the cutter head body under the working condition can be calculated, and finally, the fatigue life of the cutter head is calculated by integrating the fatigue damage values of each cutter and the cutter head body under all working conditions, so that the method is more suitable for the actual construction condition of the cutter head, and the calculation accuracy of the fatigue life of the cutter head is greatly improved. Moreover, on-site construction parameters are utilized to verify the discrete element simulation calculation result, so that the accuracy of the discrete element simulation result is ensured, the finite element simulation analysis result is closer to the actual condition in the cutterhead construction process, and the calculation accuracy of fatigue damage and fatigue life is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cutter head fatigue life calculation, and in particular, to a cutter head fatigue life calculation method and system, an electronic device, and a computer-readable storage medium. Background Art

[0002] Currently, the fatigue analysis of the cutter head components of tunneling machines can be roughly divided into the following two categories: fatigue analysis based on a prediction model and fatigue analysis based on an experimental device. Among them, the prediction model is established in the following ways: based on the mechanical property parameters and fatigue life parameters of the cutter head specimen, a life prediction model based on the neural network method is established, or a fatigue crack propagation life model is established based on finite element analysis and a synthetic load spectrum. For example, the Chinese patent application with the publication number CN115859818A discloses a cutter head fatigue life prediction method for a shield machine based on laser cladding technology. It uses the laser cladding process to machine various coatings on the surface of the preheated cutter head, prepares coating metallographic specimens, obtains microhardness data, statistically analyzes the mechanical property parameter data and fatigue life parameter data of the specimens, and constructs a cutter head fatigue life prediction model based on the neural network method; the Chinese patent application with the publication number CN111737901A discloses a cutter head fatigue life prediction method. It determines the damage tolerance based on the finite element analysis of the cutter head, obtains the synthetic load spectrum and the rain flow counting matrix, and calculates the fatigue crack propagation life. However, the fatigue analysis methods based on the prediction model are all calculated based on the theoretical model, and the obtained values are all prediction values. They are not calculated based on the on-site data of the cutter head, and the influence of the actual construction process is not fully considered. There is a large gap between the prediction value and the actual fatigue life of the cutter head. In addition, the process of fatigue analysis based on the experimental device is to conduct a fatigue test on a certain part of the cutter head component through the experimental device to obtain the fatigue damage law. For example, the Chinese patent application with the publication number CN109374268A discloses a fatigue stress and life test method for the cutter head of a shield machine / TBM. It obtains the relationship between stress strain and triaxial force through the reciprocating alternating load and triaxial loading force of the test device and the fatigue testing machine, and obtains the fatigue damage law. However, the fatigue analysis method based on the experimental device only represents the fatigue life of the test component under the experimental conditions, and is not calculated based on the actual load of the on-site cutter head. There is also a large gap between it and the actual fatigue life of the cutter head. Summary of the Invention

[0003] The present invention provides a cutter head fatigue life calculation method and system, an electronic device, and a computer-readable storage medium, which can improve the accuracy of cutter head fatigue life calculation.

[0004] According to one aspect of the present invention, there is provided a method for calculating the fatigue life of a cutter head, including the following:

[0005] Obtain the cutter head geometric features of different roadheader products, geological parameters and construction parameters during the construction process of the cutter head, and divide the construction process of the cutter head into multiple working conditions according to the geological parameters;

[0006] Construct a 3D model of the cutter head based on the cutter head geometric features;

[0007] Under any working condition, construct a discrete element simulation model according to the 3D model of the cutter head, geological parameters and construction parameters, and conduct discrete element simulation calculations, and verify the discrete element simulation calculation results with the on-site construction parameters;

[0008] Conduct finite element analysis based on the 3D model of the cutter head and the discrete element simulation calculation results to obtain the finite element simulation results of each cutter sub-model and the cutter head body sub-model;

[0009] For the remaining working conditions, repeat the above steps to obtain the finite element simulation results of each cutter sub-model and the cutter head body sub-model under all working conditions;

[0010] Calculate the fatigue life of the cutter head based on the finite element simulation results of each cutter sub-model and the cutter head body sub-model under all working conditions.

[0011] Furthermore, the process of verifying the discrete element simulation calculation results with the on-site construction parameters includes the following content:

[0012] Obtain the actual total thrust and actual total torque in the on-site construction parameters, compare them with the simulated total thrust and simulated total torque obtained from the discrete element simulation calculation respectively. If the error values between the actual total thrust and the simulated total thrust and between the actual total torque and the simulated total torque are both less than the preset threshold, it is determined that the discrete element simulation calculation results are verified.

[0013] Furthermore, the process of conducting finite element analysis based on the 3D model of the cutter head and the discrete element simulation calculation results to obtain the finite element simulation results of each cutter sub-model and the cutter head body sub-model includes the following content:

[0014] Construct a finite element simulation model of the cutter head based on the 3D model of the cutter head, and conduct finite element simulation with the discrete element simulation calculation results as the simulation input to obtain the finite element simulation results of the cutter head global model;

[0015] Divide the finite element simulation model of the cutter head into the cutter head body sub-model and each cutter sub-model based on the cutter head geometric features, and keep the meshes of each sub-model unchanged;

[0016] Conduct finite element simulation on each sub-model, and verify the simulation accuracy of each sub-model with the finite element simulation results of the cutter head global model;

[0017] Refine the meshes of each sub-model, and conduct finite element simulation again to obtain the finite element simulation results of each cutter sub-model and the cutter head body sub-model.

[0018] Furthermore, the process of calculating the fatigue life of the cutter head based on the finite element simulation results of each cutter sub-model and the cutter head body sub-model under all working conditions includes the following:

[0019] Under each working condition, conduct fatigue calculation based on the finite element simulation results of each cutter sub-model and the cutter head body sub-model to obtain the fatigue damage values of each cutter and the cutter head body under each working condition. Accumulate the fatigue damage values of each cutter and the cutter head body under each working condition to obtain the cumulative fatigue damage values of each cutter and the cutter head body at the excavated mileage. Determine the overall fatigue damage value of the cutter head based on the cumulative fatigue damage values of each cutter and the cutter head body, and determine the fatigue damage limit value based on the overall fatigue damage value of the cutter head and calculate the fatigue life of the cutter head.

[0020] Furthermore, determine the overall fatigue damage value of the cutter head based on the following formula:

[0021] D = max(D a1 ,..., D ai , D b1 ,..., D bj , D c1 ,..., D cm , D d )

[0022] where D represents the overall fatigue damage value of the cutter head, D ai represents the cumulative fatigue damage value of the i-th hob, D bj represents the cumulative fatigue damage value of the j-th cutter, D cm represents the cumulative fatigue damage value of the m-th scraper, and D d represents the cumulative fatigue damage value of the cutter head body.

[0023] Furthermore, it also includes the following:

[0024] Obtain the on-site geological parameters and on-site construction parameters during the actual excavation process of the cutter head. Based on the on-site geological parameters and on-site construction parameters, sequentially perform the above discrete element simulation calculation steps, finite element analysis steps, and cutter head fatigue life calculation steps to obtain the latest overall fatigue damage value of the cutter head and the cutter head fatigue life, as well as the corrected finite element model and cutter fatigue analysis model.

[0025] Furthermore, it also includes the following:

[0026] After the cutter head experiences fatigue failure or the construction is completed, a full life cycle database of the cutter head is established by counting the overall fatigue damage value of the cutter head, the fatigue life of the cutter head, on-site construction parameters, the geometric characteristics of the cutter head, on-site geological parameters, the modified finite element model, and the tool fatigue analysis model.

[0027] In addition, the present invention also provides a cutter head fatigue life calculation system, including:

[0028] A historical data acquisition module, which is used to acquire the geometric characteristics of the cutter head of different roadheader products, the geological parameters and construction parameters during the construction of the cutter head, and divide the construction process of the cutter head into multiple working conditions according to the geological parameters;

[0029] A cutter head three-dimensional model construction module, which is used to construct a cutter head three-dimensional model based on the geometric characteristics of the cutter head;

[0030] A discrete element simulation calculation module, which is used to construct a discrete element simulation model and perform discrete element simulation calculations according to the cutter head three-dimensional model, geological parameters and construction parameters under any working condition, and verify the discrete element simulation calculation results with on-site construction parameters;

[0031] A finite element simulation analysis module, which is used to perform finite element analysis based on the cutter head three-dimensional model and the discrete element simulation calculation results to obtain the finite element simulation results of each tool sub-model and the cutter head body sub-model;

[0032] A cutter head fatigue life calculation module, which is used to calculate the cutter head fatigue life based on the finite element simulation results of each tool sub-model and the cutter head body sub-model under all working conditions.

[0033] In addition, the present invention also provides an electronic device, including a processor and a memory. A computer program is stored in the memory, and the processor is used to execute the steps of the above method by calling the computer program stored in the memory.

[0034] In addition, the present invention also provides a computer-readable storage medium for storing a computer program for calculating the fatigue life of the cutter head. The computer program executes the steps of the above method when running on a computer.

[0035] The present invention has the following beneficial effects:

[0036] The method for calculating the fatigue life of the cutter head of the present invention takes into account that the construction loads of the cutter head during actual construction vary under different geological conditions and at different tunneling mileage. Therefore, the construction process of the cutter head is first divided into multiple working conditions according to geological parameters. After performing discrete element simulation analysis and finite element simulation analysis for each working condition in sequence, the finite element simulation results of each cutter sub-model and the cutter head body sub-model under this working condition are obtained, so that the fatigue damage values of each cutter and the cutter head body under this working condition can be calculated. Finally, the fatigue life of the cutter head is calculated by comprehensively considering the fatigue damage values of each cutter and the cutter head body under all working conditions. By calculating the fatigue damage values in segments during the construction process of the cutter head and then comprehensively calculating the fatigue life of all segments, it is more in line with the actual construction situation of the cutter head, and greatly improves the accuracy of calculating the fatigue life of the cutter head. Moreover, the discrete element simulation calculation results are verified using on-site construction parameters to ensure the accuracy of the discrete element simulation results, thereby improving the accuracy of the finite element analysis, making the finite element simulation analysis results closer to the actual situation during the construction process of the cutter head, and further improving the calculation accuracy of fatigue damage and fatigue life.

[0037] In addition, the cutter head fatigue life calculation system of the present invention also has the above advantages.

[0038] In addition to the purposes, features, and advantages described above, the present invention has other purposes, features, and advantages. The following will refer to the drawings to further elaborate on the present invention in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0040] Figure 1 is a schematic flow chart of the method for calculating the fatigue life of the cutter head according to the preferred embodiment of the present application;

[0041] Figure 2 is Figure 1 a sub-flow chart of step S4 in

[0042] Figure 3 is another schematic flow chart of the method for calculating the fatigue life of the cutter head according to the preferred embodiment of the present application;

[0043] Figure 4 is another schematic flow chart of the method for calculating the fatigue life of the cutter head according to the preferred embodiment of the present application;

[0044] Figure 5 is a schematic module structure diagram of the cutter head fatigue life calculation system according to another embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0046] Referring to Figure 1 , a preferred embodiment of the present application provides a method for calculating the fatigue life of a cutter head, including the following content:

[0047] Step S1: Obtain the cutter head geometric features, geological parameters, and construction parameters during the construction process of different roadheader products, and divide the cutter head construction process into multiple working conditions according to the geological parameters;

[0048] Step S2: Construct a three-dimensional model of the cutter head based on the cutter head geometric features;

[0049] Step S3: Under any working condition, construct a discrete element simulation model according to the three-dimensional model of the cutter head, geological parameters, and construction parameters, and perform discrete element simulation calculations, and verify the discrete element simulation calculation results using the on-site construction parameters;

[0050] Step S4: Perform finite element analysis based on the three-dimensional model of the cutter head and the discrete element simulation calculation results to obtain the finite element simulation results of each tool sub-model and the cutter head body sub-model;

[0051] Step S5: For the remaining working conditions, repeat the above steps to obtain the finite element simulation results of each tool sub-model and the cutter head body sub-model under all working conditions;

[0052] Step S6: Calculate the fatigue life of the cutter head based on the finite element simulation results of each tool sub-model and the cutter head body sub-model under all working conditions.

[0053] It can be understood that for the cutterhead fatigue life calculation method of this embodiment, considering that the construction loads of the cutterhead during actual construction are different under different geological conditions and different tunneling mileage, the cutterhead construction process is first divided into multiple working conditions according to geological parameters. After performing discrete element simulation analysis and finite element simulation analysis for each working condition in sequence, the finite element simulation results of each cutter sub-model and the cutterhead body sub-model under this working condition are obtained. Thus, the fatigue damage values of each cutter and the cutterhead body under this working condition can be calculated. Finally, the cutterhead fatigue life is calculated by comprehensively considering the fatigue damage values of each cutter and the cutterhead body under all working conditions. By calculating the fatigue damage values in segments during the cutterhead construction process and then comprehensively calculating the fatigue life of all segments, it is more in line with the actual construction situation of the cutterhead, greatly improving the accuracy of cutterhead fatigue life calculation. Moreover, the discrete element simulation calculation results are verified using on-site construction parameters, ensuring the accuracy of the discrete element simulation results, thereby improving the accuracy of finite element analysis, making the finite element simulation analysis results closer to the actual situation during the cutterhead construction process, and further improving the calculation accuracy of fatigue damage and fatigue life.

[0054] It can be understood that in step S1, according to the differences in roadheader products (such as shield machines, TBMs, vertical shafts, inclined shafts, etc.), the cutterhead geometric features, geological parameters, and construction parameters during the cutterhead construction process of each roadheader product are collected. Among them, the cutterhead geometric features include the number of hob cutters i, the number of disc cutters j, the number of scrapers m, the cutterhead body, the cutterhead structure form, etc., the geological parameters include soil and rock material parameters, and the construction parameters include burial depth, slope, total thrust force, total torque, etc. Since the construction parameters of the roadheader are different under different geological conditions, and even when tunneling in the same formation, the geological parameters may change at different mileage, then the construction parameters will also change. Therefore, in the present invention, the cutterhead construction process is divided into k working conditions according to geological parameters, and different geological parameters and construction parameters correspond to different working conditions.

[0055] It can be understood that in step S2, a general three-dimensional modeling software is used to construct a three-dimensional model of the cutterhead including components such as the cutterhead body, hob cutters, disc cutters, and scrapers based on the cutterhead geometric features according to the type of roadheader product. It is required that the three-dimensional model of the cutterhead can truly reflect the actual structure of the cutterhead. After the three-dimensional model of the cutterhead is exported as stl and step format files respectively, they are saved.

[0056] It can be understood that in step S3, for any working condition, a discrete element simulation model is established by using the construction parameters and geological parameters obtained in step S1 and the three-dimensional cutterhead model constructed in step S2. After the discrete element simulation calculation is completed, the loads on the cutterhead body and each cutter are obtained through the post-processing module, and then the total simulation thrust force F and the total simulation torque T received by the cutterhead model as a whole are calculated through load accumulation calculation. To ensure the accuracy of the simulation calculation, the present invention also verifies the discrete element simulation calculation results by using the on-site construction parameters. Among them, the process of verifying the discrete element simulation calculation results by using the on-site construction parameters includes the following content:

[0057] Obtain the actual total thrust force and the actual total torque in the on-site construction parameters, compare them with the total simulation thrust force and the total simulation torque obtained by discrete element simulation calculation respectively. If the error values between the actual total thrust force and the total simulation thrust force and between the actual total torque and the total simulation torque are both less than the preset threshold value, it is determined that the discrete element simulation calculation results pass the verification.

[0058] Specifically, collect the actual total thrust force F of the cutterhead in the on-site construction parameters of the roadheader product 现 and the actual total torque T 现 , compare them with the total simulation thrust force F and the total simulation torque T respectively and calculate the error value e. If the error values between the actual total thrust force and the total simulation thrust force and between the actual total torque and the total simulation torque are both less than the preset threshold value ε, it is considered that the accuracy of the discrete element simulation calculation results is relatively high and the next step of analysis can be carried out. If the error values between the actual total thrust force and the total simulation thrust force and between the actual total torque and the total simulation torque are not both less than the preset threshold value ε, it is considered that the accuracy of the discrete element simulation calculation results is relatively low, and the total simulation thrust force F and the total simulation torque T obtained by simulation are unreasonable. Then, the discrete element simulation model needs to be corrected, such as adjusting the material parameters of the soil and rock, correcting the contact model, etc. After further simulation calculation to obtain the total simulation thrust force F and the total simulation torque T and ensuring that the error value result e < ε, it is considered that the discrete element simulation results are effectively verified and the next step of analysis is started. Among them, the preset threshold value ε is determined according to the engineering characteristics and the numerical size recorded at the construction site, and can be specifically set according to actual needs and is not specifically limited here.

[0059] It can be understood that the present invention verifies the discrete element simulation calculation results by using the actual total thrust force and the actual total torque of the cutterhead during on-site construction, ensures the accuracy of the discrete element simulation results, is beneficial to improving the accuracy of the subsequent finite element analysis, makes the finite element simulation analysis results closer to the actual situation during the cutterhead construction process, and further improves the calculation accuracy of fatigue damage and fatigue life

[0060] It can be understood that, as Figure 2As shown, in the step S4, the process of performing finite element analysis based on the three-dimensional model of the cutterhead and the discrete element simulation calculation results to obtain the finite element simulation results of each cutter sub-model and the cutterhead body sub-model includes the following:

[0061] Step S41: Construct a finite element simulation model of the cutterhead based on the three-dimensional model of the cutterhead, and perform finite element simulation with the discrete element simulation calculation results as the simulation input to obtain the finite element simulation results of the cutterhead global model;

[0062] Step S42: Divide the finite element simulation model of the cutterhead into the cutterhead body sub-model and each cutter sub-model based on the geometric characteristics of the cutterhead, and keep the meshes of each sub-model unchanged;

[0063] Step S43: Perform finite element simulation on each sub-model, and verify the simulation accuracy of each sub-model by using the finite element simulation results of the cutterhead global model;

[0064] Step S44: Refine the meshes of each sub-model, perform finite element simulation again to obtain the finite element simulation results of each cutter sub-model and the cutterhead body sub-model.

[0065] Specifically, first, import the step format three-dimensional model file of the cutterhead in step S2 into the finite element analysis software to establish a finite element simulation model of the cutterhead, and use the cutterhead loads (i.e., the total simulation thrust F and the total simulation torque T) verified by the on-site construction parameters in step S3 as the simulation input, and perform finite element simulation to obtain the finite element simulation results of the cutterhead global model.

[0066] Then, divide the finite element simulation model of the cutterhead into various sub-models such as the hob sub-model 1,... hob sub-model i, the cutter sub-model 1,... cutter sub-model j, the scraping cutter sub-model 1,... scraping cutter sub-model m, and the cutterhead body sub-model according to the geometric characteristics of the cutterhead obtained in step S1, define the boundaries of each sub-model, and keep the meshes of each sub-model unchanged.

[0067] Next, set the displacement driving variables of each analysis step in each sub-model according to the finite element simulation results of the cutterhead global model, and set the boundary conditions (loads, constraints, etc.) of the sub-model, perform finite element simulation on each sub-model to obtain the finite element simulation results of each sub-model. Then compare the finite element simulation results of each sub-model with the finite element simulation results of the cutterhead global model. If the simulation results of the two are consistent, it means that the simulation accuracy of the sub-model meets the requirements.

[0068] Finally, refine the meshes of each sub-model and perform finite element simulation again to obtain the fine finite element simulation results of each cutter sub-model and the cutterhead body sub-model.

[0069] It can be understood that in the present invention, the global cutterhead model is first constructed and globally finite element simulated, then the global finite element model of the cutterhead is divided into each cutter sub-model and the cutterhead body sub-model, and the simulation accuracy of each sub-model is verified by using the finite element simulation results of the global cutterhead model. Finally, after the mesh of each sub-model is refined and finite element simulation is carried out again, more accurate finite element simulation results of each cutter sub-model and the cutterhead body sub-model can be obtained, greatly improving the accuracy of the finite element simulation, thereby improving the accuracy of subsequent fatigue analysis and fatigue life calculation.

[0070] It can be understood that in the step S5, for the remaining working conditions, the above steps S3 and S4 are repeatedly executed, and accurate finite element simulation results of each cutter sub-model and the cutterhead body sub-model under all working conditions can be obtained.

[0071] It can be understood that in the step S6, the process of calculating the fatigue life of the cutterhead based on the finite element simulation results of each cutter sub-model and the cutterhead body sub-model under all working conditions includes the following:

[0072] Under each working condition, fatigue calculation is carried out based on the finite element simulation results of each cutter sub-model and the cutterhead body sub-model to obtain the fatigue damage values of each cutter and the cutterhead body under each working condition. The fatigue damage values of each cutter and the cutterhead body under each working condition are accumulated to obtain the cumulative fatigue damage values of each cutter and the cutterhead body at the excavated mileage. Based on the cumulative fatigue damage values of each cutter and the cutterhead body, the overall fatigue damage value of the cutterhead is determined, and based on the overall fatigue damage value of the cutterhead, the fatigue damage limit value is determined and the fatigue life of the cutterhead is calculated.

[0073] Specifically, under each working condition, the finite element simulation results are grouped according to the construction parameters in the cutterhead propulsion state and the non-propulsion state (such as the segment assembly stage of the shield equipment and the step-changing stage of the TBM equipment). Based on the propulsion state and the non-propulsion state, the stress amplitude, the mean stress and the fatigue calculation are carried out. The finite element simulation results of each cutter sub-model and the cutterhead body sub-model are imported into the fatigue analysis software, and the fatigue damage values of each cutter and the cutterhead body corresponding to each working condition can be calculated. Then, the fatigue damage values under each working condition are linearly accumulated, and the cumulative fatigue damage values of each cutter and the cutterhead body at the excavated mileage can be calculated. Specifically, see Table 1.

[0074] Table 1. Cumulative fatigue damage values of each cutter and the cutterhead body

[0075]

[0076] Then, the overall fatigue damage value of the cutterhead is determined based on the following formula:

[0077] D = max(Da1 ,..., D ai , D b1 ,..., D bj , D c1 ,..., D cm , D d )

[0078] Among them, D represents the fatigue damage value of the entire cutterhead, D ai represents the cumulative fatigue damage value of the i-th hob, D bj represents the cumulative fatigue damage value of the j-th cutter, D cm represents the cumulative fatigue damage value of the m-th scraper, D d represents the cumulative fatigue damage value of the cutterhead body. Finally, the fatigue damage limit value is determined according to the fatigue damage value of the entire cutterhead, and the cutterhead fatigue life L is calculated. Among them, the fatigue damage value of the entire cutterhead can be directly used as the fatigue damage limit value, or a correction coefficient can be multiplied on the basis of the fatigue damage value of the entire cutterhead as the fatigue damage limit value. In addition, the calculation formula of the cutterhead fatigue life belongs to the prior art and will not be elaborated here.

[0079] It can be understood that the present invention takes into account that the construction loads of the cutterhead during actual construction are different under different geological conditions and different tunneling mileage. Therefore, the cutterhead construction process is first divided into multiple working conditions according to geological parameters. After performing discrete element simulation analysis and finite element simulation analysis for each working condition in turn, the finite element simulation results of each tool sub-model and the cutterhead body sub-model under this working condition are obtained, so that the fatigue damage values of each tool and the cutterhead body under this working condition can be calculated. Finally, the cutterhead fatigue life is calculated by comprehensively considering the fatigue damage values of each tool and the cutterhead body under all working conditions. By calculating the fatigue damage value in segments during the cutterhead construction process and then comprehensively calculating the fatigue life of all segments, it is more in line with the actual construction situation of the cutterhead and greatly improves the accuracy of calculating the cutterhead fatigue life.

[0080] In addition, as Figure 3 shown, the cutterhead fatigue life calculation method further includes the following content:

[0081] Step S7: Obtain the on-site geological parameters and on-site construction parameters during the actual tunneling process of the cutterhead. Based on the on-site geological parameters and on-site construction parameters, perform the above discrete element simulation calculation step, finite element analysis step, and cutterhead fatigue life calculation step in turn to obtain the latest fatigue damage value of the entire cutterhead and the cutterhead fatigue life, as well as the corrected finite element model and tool fatigue analysis model.

[0082] Specifically, obtain the on-site geological parameters and on-site construction parameters during the actual tunneling process of the cutter head. Using the on-site geological parameters and on-site construction parameters as inputs, repeat the above steps S3 to S6 to obtain the latest fatigue damage value and fatigue life of the entire cutter head. Additionally, the global model and sub-model of the cutter head in the finite element analysis, as well as the cutter head fatigue analysis model, can be corrected, further improving the accuracy of the cutter head fatigue life calculation. The calculation results are closer to the actual fatigue life of the cutter head and have higher credibility.

[0083] In addition, as Figure 4 shown, the cutter head fatigue life calculation method further includes the following:

[0084] Step S8: After the cutter head experiences fatigue failure or the construction is completed, count the fatigue damage value of the entire cutter head, the cutter head fatigue life, on-site construction parameters, cutter head geometric features, on-site geological parameters, the corrected finite element model, and the tool fatigue analysis model, and then establish a cutter head full-life cycle database.

[0085] Specifically, after the cutter head experiences fatigue failure or the construction is completed, count the latest fatigue damage value of the entire cutter head, the latest cutter head fatigue life, on-site construction parameters, cutter head geometric features, on-site geological parameters, the corrected finite element model, and the tool fatigue analysis model (collectively referred to as cutter head model M k ). Classify them according to geological parameters, cutter head structure form, tool parameters, fatigue damage value, fatigue life, etc. to form a cutter head full-life cycle database for a certain project, as shown in Table 2 specifically.

[0086] Table 2. Cutter head full-life cycle database for a certain project

[0087]

[0088] In addition, after accumulating a large amount of data during the construction process of multiple projects, a cutter head full-life cycle database for each project can be formed respectively, and then the data of each database can be merged to form a large cutter head full-life cycle database. Subsequently, predictive maintenance, reverse design, cost accounting, and construction parameter optimization can be carried out based on the large cutter head full-life cycle database. Among them, predictive maintenance refers to comparing the on-site geological parameters obtained through geological exploration and the on-site construction parameters with the data in the large database to obtain the cutter head fatigue damage value (tool and cutter head body damage value), thereby predicting the cutter head life and formulating a maintenance (tool replacement) plan; reverse design refers to selecting a reasonable cutter head structure form according to the geological exploration information combined with the large cutter head full-life cycle database to maximize the fatigue life of the cutter head and realize the guiding role of the database in cutter head design; cost accounting refers to calculating the number of tools required for the entire construction project through the cutter head structure form and the geological parameters of the construction project, combined with the large cutter head full-life cycle database, and then forming a cutter head plan for the construction project according to the cutter head structure form and the required number of tools, comparing the costs of different cutter head plans, and selecting the minimum cost as the final cutter head plan to achieve a reasonable matching relationship between cutter head life and cost; construction parameter optimization refers to selecting reasonable construction parameters through the large cutter head full-life cycle database according to the geological exploration information and the cutter head structure form, and optimizing the parameters according to the real-time geological parameters to maximize the construction efficiency.

[0089] In addition, as Figure 5 shown, another embodiment of the present invention further provides a cutter head fatigue life calculation system, preferably adopting the above-mentioned cutter head fatigue life calculation method, including:

[0090] A historical data acquisition module, configured to acquire the cutter head geometric features, geological parameters, and construction parameters during the construction process of different roadheader products, and divide the cutter head construction process into multiple working conditions according to the geological parameters;

[0091] A cutter head three-dimensional model construction module, configured to construct a cutter head three-dimensional model based on the cutter head geometric features;

[0092] A discrete element simulation calculation module, configured to construct a discrete element simulation model and perform discrete element simulation calculations according to the cutter head three-dimensional model, geological parameters, and construction parameters under any working condition, and verify the discrete element simulation calculation results using the on-site construction parameters;

[0093] A finite element simulation analysis module, configured to perform finite element analysis based on the cutter head three-dimensional model and the discrete element simulation calculation results to obtain the finite element simulation results of each tool sub-model and the cutter head body sub-model;

[0094] A cutter head fatigue life calculation module, configured to calculate the cutter head fatigue life based on the finite element simulation results of each tool sub-model and the cutter head body sub-model under all working conditions.

[0095] It can be understood that for the cutter head fatigue life calculation system of this embodiment, considering that the construction loads of the cutter head during actual construction vary under different geological conditions and different tunneling mileage, the cutter head construction process is first divided into multiple working conditions according to geological parameters. After performing discrete element simulation analysis and finite element simulation analysis for each working condition in sequence, the finite element simulation results of each cutter sub-model and the cutter head body sub-model under this working condition are obtained, so that the fatigue damage values of each cutter and the cutter head body under this working condition can be calculated. Finally, the cutter head fatigue life is calculated by comprehensively considering the fatigue damage values of each cutter and the cutter head body under all working conditions. By calculating the fatigue damage values in segments during the cutter head construction process and then comprehensively calculating the fatigue life of all segments, it is more in line with the actual construction situation of the cutter head, greatly improving the accuracy of cutter head fatigue life calculation. Moreover, the discrete element simulation calculation results are verified using on-site construction parameters, ensuring the accuracy of the discrete element simulation results, thereby improving the accuracy of the finite element analysis, making the finite element simulation analysis results closer to the actual situation during the cutter head construction process, and further improving the calculation accuracy of fatigue damage and fatigue life.

[0096] In addition, the cutter head fatigue life calculation system further includes:

[0097] A fatigue life correction module, configured to obtain the on-site geological parameters and on-site construction parameters during the actual tunneling process of the cutter head, and sequentially perform the above-mentioned discrete element simulation calculation steps, finite element analysis steps, and cutter head fatigue life calculation steps based on the on-site geological parameters and on-site construction parameters, to obtain the latest fatigue damage value and cutter head fatigue life of the entire cutter head, as well as the corrected finite element model and cutter fatigue analysis model.

[0098] In addition, the cutter head fatigue life calculation system further includes:

[0099] A full life cycle database construction module, configured to, after the cutter head experiences fatigue failure or the construction is completed, establish a cutter head full life cycle database by statistically analyzing the fatigue damage value of the entire cutter head, cutter head fatigue life, on-site construction parameters, cutter head geometric features, on-site geological parameters, corrected finite element model, and cutter fatigue analysis model.

[0100] It can be understood that each module of the system embodiment of the present invention corresponds to each step of the above method embodiment, so the specific working principles of each module will not be elaborated here, and reference can be made to the above method embodiment accordingly.

[0101] In addition, another embodiment of the present invention further provides an electronic device, including a processor and a memory. A computer program is stored in the memory, and the processor is configured to execute the steps of the method as described above by calling the computer program stored in the memory.

[0102] In addition, another embodiment of the present invention further provides a computer-readable storage medium for storing a computer program for calculating the fatigue life of a cutter head, and the computer program executes the steps of the method as described above when running on a computer.

[0103] The forms of common computer-readable storage media generally include: floppy disks, flexible disks, hard disks, magnetic tapes, any other magnetic media, CD-ROMs, any other optical media, punch cards, paper tapes, any other physical media with a pattern of holes, random access memories (RAMs), programmable read-only memories (PROMs), erasable programmable read-only memories (EPROMs), flash erasable programmable read-only memories (FLASH-EPROMs), any other memory chips or cartridges, or any other media readable by a computer. Instructions can further be transmitted or received by a transmission medium. The term transmission medium can include any tangible or intangible medium that can be used to store, encode, or carry instructions for execution by a machine, and includes digital or analog communication signals or the intangible medium that facilitates the communication of the above instructions. The transmission medium includes coaxial cables, copper wires, and optical fibers, which include the wires of a bus for transmitting a computer data signal.

[0104] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memories, CD-ROMs, optical memories, etc.) containing computer-usable program code. The solutions in the embodiments of the present application can be implemented using various computer languages. For example, object-oriented programming languages such as Java and interpreted scripting languages such as JavaScript.

[0105] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to the processors of general-purpose computers, special-purpose computers, embedded processors, or other programmable data processing devices to generate a machine, so that the instructions executed by the processors of the computer or other programmable data processing devices generate for realizing in the process Figure 1 one process or multiple processes and / or blocksFigure 1 means for the functions specified in one or more boxes.

[0106] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce a manufacture including an instruction means that implements the functions specified in one Figure 1 process or more processes and / or boxes Figure 1 means for the functions specified in one or more boxes.

[0107] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, so that the instructions executed on the computer or other programmable apparatus provide steps for implementing the functions specified in one Figure 1 process or more processes and / or boxes Figure 1 means for the functions specified in one or more boxes.

[0108] Although the preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concepts. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present application.

[0109] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these changes and variations.

[0110] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for calculating the fatigue life of a cutter head, characterized in that, It includes the following: Obtain the cutterhead geometric features of different roadheader products, geological parameters and construction parameters during the construction process of the cutterhead, and divide the construction process of the cutterhead into multiple working conditions according to the geological parameters; Construct a 3D model of the cutterhead based on the cutterhead geometric features; Under any working condition, construct a discrete element simulation model according to the cutterhead 3D model, geological parameters and construction parameters, conduct discrete element simulation calculations, and verify the discrete element simulation calculation results using the on-site construction parameters; Conduct finite element analysis based on the cutterhead 3D model and the discrete element simulation calculation results to obtain the finite element simulation results of each cutter sub-model and the cutterhead body sub-model; For the remaining working conditions, repeat the above steps to obtain the finite element simulation results of each cutter sub-model and the cutterhead body sub-model under all working conditions; Based on the finite element simulation results of each cutter sub-model and the cutterhead body sub-model under all working conditions, calculate the fatigue life of the cutterhead.

2. The cutter head fatigue life calculation method according to claim 1, wherein, The process of verifying the discrete element simulation calculation results using the on-site construction parameters includes the following: Obtain the actual total thrust and actual total torque in the on-site construction parameters, compare them with the simulated total thrust and simulated total torque obtained from the discrete element simulation calculations respectively. If the error values between the actual total thrust and the simulated total thrust and between the actual total torque and the simulated total torque are both less than the preset threshold, it is determined that the discrete element simulation calculation results are verified.

3. The cutter head fatigue life calculation method according to claim 1, characterized in that The process of conducting finite element analysis based on the cutterhead 3D model and the discrete element simulation calculation results to obtain the finite element simulation results of each cutter sub-model and the cutterhead body sub-model includes the following: Construct a cutterhead finite element simulation model based on the cutterhead 3D model, and use the discrete element simulation calculation results as the simulation input for finite element simulation to obtain the finite element simulation results of the cutterhead global model; Divide the cutterhead finite element simulation model into the cutterhead body sub-model and each cutter sub-model based on the cutterhead geometric features, and keep the meshes of each sub-model unchanged; Conduct finite element simulation on each sub-model, and verify the simulation accuracy of each sub-model using the finite element simulation results of the cutterhead global model; Refine the meshes of each sub-model and conduct finite element simulation again to obtain the finite element simulation results of each cutter sub-model and the cutterhead body sub-model.

4. The cutter head fatigue life calculation method according to claim 1, characterized in that The process of calculating the fatigue life of the cutterhead based on the finite element simulation results of each cutter sub-model and the cutterhead body sub-model under all working conditions includes the following: Under each working condition, conduct fatigue calculations based on the finite element simulation results of each cutter sub-model and the cutterhead body sub-model to obtain the fatigue damage values of each cutter and the cutterhead body under each working condition. Accumulate the fatigue damage values of each cutter and the cutterhead body under each working condition to obtain the cumulative fatigue damage values of each cutter and the cutterhead body at the excavated mileage. Determine the overall fatigue damage value of the cutterhead based on the cumulative fatigue damage values of each cutter and the cutterhead body, determine the fatigue damage limit value based on the overall fatigue damage value of the cutterhead, and calculate the fatigue life of the cutterhead.

5. The cutter head fatigue life calculation method according to claim 4, wherein Determine the overall fatigue damage value of the cutterhead based on the following formula: D = max(D a1 ,..., D ai , D b1 ,..., D bj , D c1 ,..., D cm , D d ) Among them, D represents the fatigue damage value of the entire cutter head, D ai represents the cumulative fatigue damage value of the i-th hob, D bj represents the cumulative fatigue damage value of the j-th cutter, D cm represents the cumulative fatigue damage value of the m-th scraper, D d represents the cumulative fatigue damage value of the cutter head body.

6. The cutter head fatigue life calculation method according to claim 1, characterized in that It also includes the following: Obtain the on-site geological parameters and on-site construction parameters during the actual tunneling process of the cutter head. Based on the on-site geological parameters and on-site construction parameters, successively perform the above discrete element simulation calculation steps, finite element analysis steps, and cutter head fatigue life calculation steps to obtain the latest fatigue damage value and cutter head fatigue life of the entire cutter head, as well as the corrected finite element model and tool fatigue analysis model.

7. The method for calculating the fatigue life of the cutter head according to claim 6, wherein It also includes the following content: After the cutter head shows fatigue failure or after the construction is completed, establish a cutter head full-life cycle database after statistically analyzing the fatigue damage value of the entire cutter head, cutter head fatigue life, on-site construction parameters, cutter head geometric characteristics, on-site geological parameters, corrected finite element model, and tool fatigue analysis model.

8. A cutter head fatigue life calculation system, characterized in that, It includes: A historical data acquisition module, which is used to obtain the cutter head geometric characteristics, geological parameters, and construction parameters during the cutter head construction process of different roadheader products, and divide the cutter head construction process into multiple working conditions according to the geological parameters; A cutter head three-dimensional model construction module, which is used to construct a cutter head three-dimensional model based on the cutter head geometric characteristics; A discrete element simulation calculation module, which is used to construct a discrete element simulation model and perform discrete element simulation calculations according to the cutter head three-dimensional model, geological parameters, and construction parameters under any working condition, and verify the discrete element simulation calculation results using the on-site construction parameters; A finite element simulation analysis module, which is used to perform finite element analysis based on the cutter head three-dimensional model and the discrete element simulation calculation results to obtain the finite element simulation results of each tool sub-model and cutter head body sub-model; A cutter head fatigue life calculation module, which is used to calculate the cutter head fatigue life based on the finite element simulation results of each tool sub-model and cutter head body sub-model under all working conditions.

9. An electronic device, characterized in that, It includes a processor and a memory. The memory stores a computer program. The processor is used to execute the steps of the method according to any one of claims 1 to 7 by calling the computer program stored in the memory.

10. A computer-readable storage medium for storing a computer program for calculating the fatigue life of a cutter head, characterized in that, When the computer program runs on a computer, it executes the steps of the method according to any one of claims 1 to 7.

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