871 results about "Finite element software" patented technology

The invention provides a metal material surface difference analysis method which comprises the following steps: calculating Gibbs free energy at different temperatures by adopting a thermodynamic model according to chemical components and an initial microstructure of a material, and drawing a time-temperature-transformation curve of the material through phase diagram analysis software, obtaining a grain growth kinetic parameter and a recrystallization temperature interval; inputting data information of strength, hardness and toughness in different application scenes by utilizing the established multi-objective optimization model, and searching optimal grain size distribution through a genetic algorithm to obtain an optimal microstructure for balancing various performance indexes; according to the optimal microstructure, a heat treatment process route is reversely designed, finite element software is adopted to simulate temperature field and stress field distribution in the heat treatment process, and control parameters of heating, heat preservation and cooling are determined through iterative optimization.

The invention provides a segmental bridge wind vibration performance evaluation method and system, and relates to the technical field of segmental bridge wind vibration performance. Laser scanning is used for obtaining geometric parameters of a segmental bridge and collecting material characteristics, the geometric parameters and the material characteristics are imported into finite element software, a basic model is established, and boundary conditions are set; modal analysis is executed in finite element software, the natural vibration frequency and the vibration mode are calculated through a Lanczos method, and basic data are provided for wind load analysis; simulating a wind load by using a Davenport wind spectrum, setting a wind speed and a wind direction, and then applying the wind speed and the wind direction to the model; finally, the wind load condition is adjusted, the performance of the bridge under different wind loads is tested, and the displacement, acceleration and stress distribution of the bridge are analyzed and calculated through dynamic response to complete the wind vibration performance evaluation of the segmental bridge.

The invention belongs to the technical field of constructional engineering, and particularly relates to a method for calculating flexural capacity of a CFRP (carbon fiber reinforced plastic) reinforced wood formwork system, which comprises the following steps: acquiring structural parameters of the CFRP reinforced wood formwork system, simulating mechanical properties of the CFRP reinforced wood formwork system by adopting finite element software, and determining the maximum distance between adjacent wood beams in the CFRP reinforced wood formwork system; based on the structural parameters of the CFRP reinforced wood formwork system, the stress-strain relation between wood and the carbon fiber cloth is calculated, and a calculation expression of the bending bearing capacity of the wood beam based on the CFRP reinforced wood formwork system is established; and calculating the flexural capacity of the wood beams under the maximum spacing of the adjacent wood beams by combining the calculation expressions of the maximum spacing of the adjacent wood beams and the flexural capacity of the wood beams in the CFRP reinforced wood template system. The flexural capacity of the CFRP material reinforced wood formwork system can be accurately and conveniently calculated, and then the method is applied to safety evaluation of wood components in wood structure buildings.

The invention relates to an impact fatigue finite element simulation method considering a scale effect, and belongs to the technical field of material damage failure simulation analysis. According to the invention, a constitutive model suitable for advanced materials and materials prepared by an advanced process is established, static characteristics, dynamic characteristics, scale effects and damage evolution processes of the materials are combined, and impact damage and impact fatigue processes of the advanced materials can be effectively simulated; a non-localization cross-scale constitutive method is adopted, the efficiency requirement of engineering finite element simulation can be met, meanwhile, localization non-uniform modeling is compatible so as to face more accurate scientific research calculation, and good balance is achieved between precision and efficiency; by means of the method, integrated calculation in commercial finite element software can be achieved, impact damage and fatigue simulation considering the material scale effect can be more efficiently conducted, and application of advanced materials in the aerospace field impact and reciprocating impact load environment is promoted.

The invention provides an analysis method and system for dynamic fracture of a quasi-brittle material. The method is used for solving the technical problem that an existing method is insufficient in dynamic fracture capturing capacity in quasi-brittle materials. The method comprises the following steps: constructing a representative volume element RVE of a quasi-brittle material with two embedded fracture planes; a dual-scale model of the RVE is constructed, the dual-scale model comprises a macroscale sub-model and a mesoscale sub-model, and the crack traction force and the displacement jump increment in the mesoscale sub-model meet the rate-dependent cohesive friction law; identifying the parameters of the dual-scale model; and embedding the dual-scale model into finite element software to simulate the dynamic fracture of the quasi-brittle material. The contained mesoscale crack plane has the key characteristics of the dynamic fracture behavior of the quasi-brittle material, and has remarkable advantages compared with a classical empirical model.

The invention discloses a risk determination method and system based on engineering structure failure, relates to the technical field of engineering risk determination, and comprises the steps of establishing an engineering geometric model of an engineering structure by utilizing finite element software, and providing a reliable basis for subsequent assessment of stress concentration coefficients and failure probabilities. And evaluating the fatigue life of the engineering structure according to the stress concentration coefficient, and generating the overall fatigue life of the engineering structure by combining information such as the stress concentration coefficient, the dangerous area type and the fatigue life of the dangerous area. And evaluating the failure probability and the failure criticality of each failure mode, and considering the correlation between the failure modes to obtain an accurate failure probability. The risk value of the engineering structure failure mode is generated based on the fatigue life, the failure probability and the failure criticality, the influence of the fatigue life on the risk of the engineering structure is added, the accuracy and adaptability of risk determination of the engineering structure failure are improved, and safe and stable operation of the engineering structure is ensured.

The invention discloses a vibration noise analysis method for a combined box girder bridge with an axle coupling effect, and belongs to the technical field of bridge engineering. The method comprises the following steps: S1, establishing a train-track-bridge coupled vibration model of a high-speed railway steel-concrete combined box girder bridge, and compiling a train-track-bridge coupled vibration simulation analysis program based on a Matlab language and Ansys finite element software; s2, establishing a low-frequency noise prediction model in the steel-concrete combined box girder bridge of the high-speed railway, and obtaining a low-frequency noise radiation rule of a bridge structure; s3, establishing a medium-high noise prediction model of the steel-concrete combined box girder bridge of the high-speed railway, and performing numerical simulation on medium-high frequency radiation noise of a bridge structure; and S4, analyzing the influence parameters of the vibration noise of the steel-concrete combined box girder bridge of the high-speed railway in combination with the models established in the steps S1 to S3. The technical scheme is used for analyzing vibration and noise conditions of the steel-concrete composite beam applied to the field of railroad bridges.

The invention relates to a landslide motion analysis method based on unmanned aerial vehicle remote sensing aerial survey and three-dimensional geological modeling, which comprises the following steps: acquiring high-resolution topographic data of a landslide hidden danger area by utilizing a laser scanner technology carried by an unmanned aerial vehicle, and calculating landslide instability failure ranges and stability coefficients under different scenes by utilizing finite element Geostudio software; and taking the stability coefficient as a reduction coefficient of a rock-soil body strength parameter, then determining the rock-soil body strength parameter under different scenes in discrete element PFC software, and realizing three-dimensional failure motion process analysis of the landslide under different scenes by using discrete elements. According to the invention, through PFC software, landslide occurrence scales under different rainfall and earthquake scenes and motion characteristics of landslides of different scales after instability can be compared; large deformation under the fluid-solid coupling condition can be effectively simulated, rock-soil body strength parameters under different rainfall (or earthquake) scenes can be determined, and the landslide three-dimensional motion process under different scenes can be carried out.

The invention provides a digital twinning method of multi-source heterogeneous data feedback mapping for track structure long-term service state evaluation. The method comprises the following steps: burying fiber grating sensors, stress-strain sensors and the like in a track structure and a lining to obtain data, and performing ballastless track damage condition simulation and vehicle dynamics response analysis under the action of basic deformation by adopting finite element software and multi-body dynamics software to form a simulation calculation result library; establishing a three-dimensional virtual model of structures such as a long-section ballastless track and a lining on site, respectively carrying out result correspondence and result correction on a simulation result library and the three-dimensional model by adopting a feedback coupling mapping correction method, and carrying out coupling feedback mapping verification between different simulation calculation results and actually measured data; accurate reflection and real-time visual presentation of stress characteristics of a track structure under the influence of large deformation of a foundation are achieved, and meanwhile real-time prediction and reasonable evaluation are conducted on changes of the stress state of the track structure.

The invention relates to the technical field of geotechnical engineering soil parameters, in particular to an HSS model parameter determination method based on static cone penetration cone tip resistance, which comprises the following steps: simulating a pore expansion behavior in finite element software to obtain the ultimate pressure of pore expansion; establishing the relationship between the ultimate pressure of pore expansion and the resistance of the cone tip of the static sounding; performing numerical simulation on HSS model parameters on the basis of the relationship between the ultimate pressure of pore expansion and static sounding cone tip resistance to obtain a series of HSS model parameters and corresponding static sounding cone tip resistance values, and determining the relationship between the HSS model parameters and the static sounding cone tip resistance by using a neural network model; and determining the required HSS model parameters according to the relationship between the HSS model parameters and the static sounding cone tip resistance. According to the method, the determination accuracy of the HSS model parameters is improved by establishing the relation between the HSS model parameters and the static sounding cone tip resistance.

The invention discloses a rapid reconstruction method, device and equipment for a soil mass freeze-thaw hydrothermal field and a storage medium, and the method comprises the steps: building a one-dimensional soil column frost heaving-thaw collapse calculation model through finite element software, carrying out the simulation calculation to obtain a soil mass one-dimensional freeze-thaw transient temperature field and a moisture field, and obtaining a source domain data set containing the position, time, temperature and saturation; the position and time in the source domain data set serve as input, temperature and saturation serve as output, a deep neural network is established, and a loss function comprises data loss and physical loss and also relates to a temperature field and a moisture field; training the source task model to obtain neural network parameters; and training the target task model. On the basis of numerical simulation and deep transfer learning, the problem of multi-field coupling under the background of machine learning is solved, and meanwhile, the generalization performance of the model is improved, so that rapid reconstruction of the transient temperature field and the moisture field of the one-dimensional frost heaving-thaw collapse test of the soil body under the condition of sparse measuring points is realized.

The invention discloses a deep learning-based staged tension prestress long-term loss prediction method, which belongs to the field of deep learning, solves the problem of poor prediction result robustness of a traditional prestress measurement method, and comprises the following steps: obtaining bridge original data based on a standard drawing set and a bridge design specification; based on the construction environment conditions and the concrete age, concrete material attributes are calculated; based on bridge original data and concrete material attributes, finite element software is used for simulating prestressed reinforcement staged tensioning processes under different working conditions, and a bridge prestressed reinforcement staged tensioning loss data set is generated; and constructing a prestress loss prediction model based on the multi-layer perceptron neural network, processing the staged tensioning loss data set of the bridge prestressed reinforcement based on the prestress loss prediction model, and outputting a prediction result of long-term loss caused by shrinkage and creep of the prestressed reinforcement. According to the method, the stress loss of the prestressed reinforcement can be effectively predicted, and the prediction robustness and accuracy are improved.

The invention belongs to the field of composite material structure optimization design, and particularly relates to a modeling method of a variable stiffness composite material laminated plate based on a finite element. The method comprises the following steps: defining parameters of a composite laminated plate model; compiling a script file by utilizing a programming language, and dividing a quadrilateral grid; calculating geometric coordinates of the unit center points; calculating the fiber direction angle of each unit under the central point coordinate layer by layer and fiber by fiber, taking the fiber direction angle as the fiber direction angle of the corresponding unit in the current paving layer, and updating the fiber paving layer number of the unit; defining material attributes; defining boundary conditions and loads; generating a calculation input file from the finite element model, and submitting the calculation input file to corresponding finite element software for analysis so as to realize finite element automatic modeling of the variable-stiffness composite laminated plate; according to the method, the problems that variable-angle laying layers need to be input one by one, and efficiency is low are solved, and finite element automatic modeling of the porous structure and the bent plate can be achieved.

The invention discloses a composite material microcosmic failure analysis method based on a micromechanical failure theory. The method comprises the following steps: obtaining performance parameters of each component of a composite material according to a composite material component performance test; establishing a finite element mesoscopic RVE model; the rigidity of the interface between the fiber and the matrix is reversely deduced through fitting of experimental data of a macroscopic experiment; applying a periodic boundary condition to the finite element mesoscopic RVE model; a load is applied to the finite element mesoscopic RVE model through ABAQUS finite element software, the failure behavior of the composite material in a complex stress state is simulated, and the stress-strain relation and the mesoscopic failure rule of the composite material in different loading modes are predicted. The method can be applied to composite material mesoscopic failure simulation analysis in axial, transverse and off-axis load, thermal load and composite load forms, can more accurately predict the mesoscopic failure rule of the composite material, and has important significance on research and application of the composite material.

The invention discloses a turbine part elastic digital twinning virtual-real interaction method combining geometric features and Fourier neural operators. The method comprises the following steps: S1, setting material attributes and boundary conditions; s2, finite element data generation and format conversion; s3, constructing and training a prediction model based on a geometric perception Fourier operator; and S4, model prediction and verification. According to the method, finite element software and AI prediction are combined, the turbine parts are subjected to self-defined Fourier transform and geometric coding technologies, the problems that an existing turbine part analysis method is complex in calculation and complex geometric features are effectively processed are solved, a traditional elastic analysis method is optimized, and the method has the advantages of being high in reliability and high in reliability. The method is a technology for improving the analysis precision while reducing the calculation complexity, and is suitable for solving complex geometrical shapes and physical phenomena. The method has a wide application prospect, and can provide efficient calculation support for design optimization, performance evaluation and fault detection.

The invention discloses a method for establishing a microcosmic finite element model of a reinforced fiber concrete structure, and belongs to the technical field of concrete microcosmic model.The method comprises the steps that an MATLAB language is combined with ANSYS / LS-DYNA finite element software for analog simulation to obtain a four-phase finite element model of the reinforced concrete structure, and according to the method, reinforcing steel bars meeting requirements are arranged in a preset area; aggregate and fiber are put in the putting area, it is ensured that the aggregate, the fiber and the steel bars do not invade one another, modeling is conducted on a large number of fibers, accurate modeling is conducted on the directionally-arranged steel bars, the aggregate with different particle sizes is put into the modeling system, and the defect that the aggregate, the steel bars and the aggregate invade one another is overcome; the simulation model is very close to a real concrete structure, the model generation time is short, and the model precision is high.

The invention discloses a structural dynamic response obtaining method for a fixed offshore wind turbine. The method comprises the following steps: establishing an initial finite element model according to related model data of a fixed offshore wind turbine to be tested, correcting the initial finite element model in combination with obtained actually measured modal parameters, and solving a vibration mode function based on the corrected finite element model; solving kinetic energy and potential energy of the to-be-tested wind driven generator structure; and according to the obtained structural kinetic energy and potential energy, a mass matrix, a stiffness matrix and a damping matrix are constructed based on an Euler-Lagrange equation and a basic kinetic equation, so that a dimensionality-reduced structural kinetic model of the offshore wind turbine is established, an inherent frequency value is obtained through solving, and the dynamic response is obtained. The method effectively overcomes the defects that a model is established depending on finite element software to solve the dynamic response in the prior art, and has the advantages that the modeling process is simple, the solving time is short, multi-field coupling load application can be met, and the control technology is easy to implement.

The invention provides a bearing / heat exchange integrated outer duct heat exchanger structure and a design method thereof. The design method mainly comprises the steps of heat exchanger three-dimensional modeling design, computational fluid dynamics optimization design and steady-state thermal stress analysis, three-dimensional modeling software is used for designing an inner flow channel structure and an outer fin structure of an outer duct air heat exchanger, and finite element software is imported. The method comprises the following steps: dividing grids, establishing a finite element model, setting a turbulence model, adding boundary conditions of the external duct heat exchanger, performing fluid flow and heat transfer simulation in the heat exchanger to obtain a fluid dynamic model of the external duct heat exchanger, transmitting temperature field simulation data to the finite element model, and performing steady-state thermal stress simulation to obtain a stress distribution nephogram. And structural performance evaluation is performed in combination with strength analysis. According to the method, the simulation efficiency can be improved on the premise that the simulation precision is not lost, organic combination of design / performance is achieved, and theoretical guidance is provided for structural design of the bearing / heat exchange integrated outer duct heat exchanger.

The invention discloses a concrete arch dam global structural mechanical parameter zoning rapid inversion method, and relates to the technical field of dam operation safety monitoring and management, and the method comprises the steps: building a dam body and foundation three-dimensional finite element model through finite element software according to engineering design and monitoring data, and building a foundation three-dimensional finite element model according to damming material mechanical parameter information; partitioning the three-dimensional finite element model, analyzing the sensitivity of mechanical parameters of each region, determining sensitive mechanical parameters influencing the deformation of the concrete arch dam, and carrying out self-adaptive intelligent sampling on the sensitive mechanical parameters according to a sensitivity analysis result, and constructing a deep learning agent model reflecting a nonlinear relationship between the sensitive mechanical parameters of the dam and the deformation of each monitoring point, and carrying out deep learning inversion on the elastic modulus of the dam body and the deformation modulus of the bedrock. According to the invention, the method can efficiently and accurately invert and determine the structural mechanical parameters of the arch dam in the actual operation period, and provides a good basis for the safety analysis of the dam.

The invention discloses a state evaluation and fault early warning method and system based on superconducting current limiter modeling, an electromagnetic heat multi-physical field coupling model of a superconducting current limiter is constructed based on finite element software, and the method comprises the following steps: constructing a three-dimensional geometric structure of a solenoid-shaped superconducting current limiter, and setting a peripheral electromagnetic environment boundary; establishing an electromagnetic field control equation based on a Maxwell equation set and the nonlinear resistivity characteristic of the superconducting material, and coupling a solid heat transfer control equation to form a multi-physical field interaction model; optimizing grid division to balance calculation precision and solving efficiency; body parameters of the superconducting current limiter including the initial critical current Ic0 and the critical temperature Tc and working condition parameters including the environment temperature and the transmission current It are input, the parameters are dynamically adjusted according to the actual operation scene, and the voltage U at the two ends during normal operation is calculated through a model; by collecting voltage measured values Up at the two ends of the superconducting current limiter during actual operation in real time, whether the voltage measured values Up exceed a threshold value set according to the voltage U or not is judged, and an early warning mechanism is triggered.

The invention belongs to the technical field of direct shear-seepage tests of rock joints, and discloses a numerical test method for direct shear-seepage of rock joints under different boundary conditions, which comprises the following steps of: establishing a joint surface numerical model by using finite element software, and performing tests for simulating joint shear mechanical behaviors by applying different boundary conditions. And the contact state and the opening distribution of the joint surface under different shear displacements are obtained, so that the shear stress evolution mechanism of the joint surface is better revealed, and the mechanical behavior of the rough joint surface in the shear process is accurately expressed. According to the method, the evolution law of mechanical properties in the joint shearing process can be reflected, the influence of shearing deformation on the joint seepage characteristics can be reflected, joint opening data distribution is imported into programming software to be processed, a joint seepage numerical model is constructed, then multi-physics field simulation analysis software is imported, and the joint seepage performance is improved. The flow velocity, the osmotic pressure and the streamline distribution characteristics in the flowing process are calculated, so that the joint permeability characteristics are analyzed.

The invention discloses a rusty metal wire fatigue life calculation method, device and equipment, and the method comprises the steps: building a finite element calculation model of a real corrosion surface, calculating a stress concentration region of the real corrosion surface, determining the position, size and crack propagation direction of a dangerous corrosion pit, defining a damage evolution criterion and a damage criterion, and calculating the fatigue life of the rusty metal wire. And a criterion program is embedded in finite element software for calculation, and the fatigue crack initiation life and extension life of the rusted metal wire are obtained. And a CM-EIFS extrapolation method is combined with the fatigue crack initiation and propagation model to respectively calculate the fatigue crack initiation life and propagation life of the rusted metal wire, and the fatigue crack initiation life and propagation life are compared with the calculation result of the finite element calculation model to verify the correctness of the fatigue life calculated by the rusted metal wire model. By establishing the finite element calculation model considering the corrosion morphology and the crack initiation life, the calculation result of the fatigue life of the rusted metal wire is closer to the actual situation, the calculation is simple and convenient, and the precision is high.

The invention discloses a lightning stroke attachment point calculation method of a complex surface flat plate structure, and aims to overcome the defects of an existing lightning stroke attachment point numerical calculation method, and on the basis that finite element software is utilized to construct a typical needle plate model based on an electric field model method, an electrode is moved downwards to simulate the thunder and lightning development process under first guidance. A pilot / corona onset criterion is established based on short-gap discharge and material corona discharge theories, a numerical simulation algorithm is provided for evaluating the lightning protection design of a complex surface flat plate structure, the determination accuracy of the attachment points of the flat plate structure with similar surface material conductivity, complex surface microstructure and no salient points is improved, the attachment point simulation algorithm is optimized, and the method is suitable for application and popularization. And tedious and high-cost test links are effectively avoided.

The invention provides a corrosion fatigue crack propagation life prediction method based on an environmental damage model, and the method comprises the steps: building a corrosion fatigue damage model according to a fatigue damage model considering the effects of maximum stress and plastic strain and the influence of an environmental factor Cenv; carrying out a low-cycle fatigue test and a corrosion fatigue crack propagation test by utilizing the low-cycle fatigue sample and the compact tensile sample to respectively obtain low-cycle fatigue data and corrosion fatigue crack propagation rates under different stress ratios; the damage model is written into a subprogram in a USDFLD user subprogram interface provided by finite element software ABAQUS, corrosion fatigue crack propagation simulation is carried out, and the corrosion fatigue crack propagation rate of the standard compact tensile sample under different stress ratios is predicted. The influence of a fatigue damage model and an environmental factor Cenv is taken into consideration, finite element simulation is carried out in combination with a USDFLD subprogram of finite element software ABAQUS, and corrosion fatigue crack propagation simulation of the structure is achieved. The method is high in universality and easy to master and implement.

The invention provides a method and a system for predicting residual compression strength of a carbon fiber composite material after lightning stroke, and belongs to the technical field of electric digital data processing. According to the method, by considering the pyrolysis degree of the lightning stroke CFRP composite material, the non-linear mechanical property parameters related to the pyrolysis degree actually measured based on the test and the thermal and mechanical damage results predicted based on the electric-thermal-mechanical multi-physics field coupling model are calculated; an actually measured nonlinear mechanical property thermal damage factor and a mechanical damage factor caused by impact damage are introduced into a constitutive relation of the CFRP composite material, and a finite element simulation method capable of quantitatively predicting the residual compression strength after lightning stroke is established by virtue of finite element software ABAQUS; the problems that in the prior art, the influence mechanism of lightning stroke damage on the mechanical property of the CFRP composite material is not clear, and a simulation modeling method capable of being directly used for calculating and predicting the residual compression strength after lightning stroke is lacked are solved.

The invention relates to the technical field of building construction, and discloses a cantilever type multi-layer large-span steel reinforced concrete wall active anti-cracking construction method which comprises the following steps: step 1, carrying out optimization calculation through finite element software; secondly, a supporting jig frame is installed; step 3, mounting a cantilever support; fourthly, pouring is conducted in different areas; 5, the orthogonal truss is poured; and sixthly, layered pouring is conducted. Through all-working-condition stress simulation analysis, reasonable construction procedures of all stages of the steel reinforced concrete cantilever wall are optimized, through the arranged locking unit and the arranged limiting unit, the construction efficiency and safety are improved, meanwhile, the supporting operation procedures are reduced, the efficiency is improved, meanwhile, the cantilever wall fully considers the tension and compression area, and the construction cost is reduced. The pressed area is poured in advance in a stepped mode, and the pulled area is poured later, so that the cracking risk of the cantilever type multi-layer large-span steel reinforced concrete wall is effectively weakened, and the construction safety and stability of all stages of the structure are guaranteed.

The invention discloses a high-formwork optimization design method and system based on BIM and finite element analysis, and the method comprises the steps: S100, building a three-dimensional BIM model of a main body structure, and creating an intelligent parameterization frame body family which is mapped with a main body structure family and has a self-verification function; s200, importing a parameterized family and linking the main body model, generating a plurality of groups of frame body arrangement schemes through spatial topology analysis, and performing a three-dimensional collision test after optimization; s300, setting dynamic boundary constraints and construction loads in stages, and generating a geometric and mechanical integrated data packet; s400, data packet parameters are automatically mapped to finite element software through a plug-in, models are built in stages, multi-working-condition analysis is carried out, if the parameters exceed the limit, frame body parameters are modified, iterative optimization is carried out until the parameters meet the standard, and a result is synchronized to a three-dimensional BIM model; and S500, a construction drawing is automatically generated, and visual disclosure and high formwork monitoring point selection are carried out. According to the method, design, computational analysis and construction application data linkage and closed-loop management from design to construction to monitoring are achieved, and the high formwork design efficiency and safety are improved.

The invention relates to a spinning method for an internal tooth-shaped transmission part, which comprises the following steps: in finite element software, establishing a model of a plate-shaped blank and a spinning tool which are the same as those of an actually processed transmission part, and carrying out drawing spinning simulation processing on the plate-shaped blank by using the spinning tool to obtain a cylindrical blank subjected to simulation forming; then a model of the spinning tool is used for conducting single-pass spinning simulation machining on the cylindrical blank, and the simulation rolling reduction needed by the tooth height of the inner tooth profile of the transmission part is determined; and drawing spinning and single-pass spinning are adopted, the transmission part is actually machined by using the rolling reduction, and the transmission part with the inner tooth shape is obtained. Compared with a traditional extrusion, broaching and composite forming method, the spinning method for producing the internal tooth-shaped transmission part has the advantages that the fiber flow direction of an original blank is reserved, the surface quality of the part is high, and the production efficiency is improved.

The present invention relates to the technical field of reactor vibration analysis, and specifically to a vibration state simulation monitoring system for dry-type reactors, the system comprising: assembling parts into a reactor model through the assembly function of drawing software; a model import module, used to import the drawn reactor model into finite element software, and set parameters in each part; a modal analysis module, used to determine and analyze the vibration characteristics of the reactor structure; a diagnosis module, used to obtain the vibration response characteristics of the reactor under power-on conditions according to the vibration characteristics of each part, and find out the vibration signal with obvious fault characteristics. The model of the relationship between the reactor fault and each characteristic quantity of its vibration signal established by the present invention can obtain the vibration characteristics of the reactor during the fault latent period from the model, so as to study the direct or indirect relationship between its latent characteristics and the fault characteristics, and adjust the relevant parameters of the reactor in advance, so as to prevent the occurrence of faults to a certain extent.

The invention provides a fan tower structure optimization method based on finite element analysis, and belongs to the technical field of structure optimization. The method comprises the steps that 1, the design requirement of a target fan tower is obtained, and a three-dimensional finite element model of the target fan tower is established; 2, linear stress analysis is conducted on the three-dimensional finite element model through finite element software, and areas prone to fatigue are recognized; 3, by adjusting prestress structure parameters of the three-dimensional finite element model, iterative optimization is carried out until an area prone to fatigue reaches the aims of fatigue resistance and safety, and a first model is generated; 4, predicting the performance of the first model in a preset service life period by using a fatigue analysis method to obtain a prediction result; and 5, performing inverse optimization on the first model according to a prediction result, and adjusting model parameters of the first model to generate an optimal model. The tower structure is optimized, the tower strength is improved, and the cost is reduced.