414 results about "Elastic plastic" patented technology

The invention discloses an electric arc additive manufacturing temperature field and stress field real-time reconstruction method, which comprises the following steps of: 1, constructing a sequential coupling finite element model in which heat conduction analysis and thermoelastic-plastic mechanical analysis are combined on the basis of process parameters of an electric arc additive manufacturing process and three-dimensional geometry of parts, generating a multi-physical field coupling data set among heat flux density, temperature and stress; step 2, constructing and training a neural network model based on a multi-physics field coupling data set, and realizing mapping from heat flux density to temperature and stress; 3, dynamically optimizing heat source model parameters in combination with real-time monitoring data and process parameters in the electric arc additive manufacturing process; and 4, based on the optimized heat source model parameters and the trained neural network model, real-time reconstruction of a temperature field and a stress field in the electric arc additive manufacturing process is achieved. According to the invention, the requirements of rapid sensing and intelligent regulation and control of temperature and stress states on an additive manufacturing site are met.

The invention relates to the technical field of geomechanical simulation of tunnel engineering, in particular to a tunnel surrounding rock water immersion weakening fluid-solid coupling simulation method and system.The method comprises the steps that mechanical parameters and seepage parameters of typical tunnel surrounding rock materials are obtained, and then an evolution equation of water immersion equivalent strain along with time is constructed; constructing a water immersion equivalent strain-seepage parameter dynamic correlation model based on the evolution equation and the seepage parameters; a seepage-stress coupling elastic-plastic damage constitutive model is constructed on the basis of a water immersion equivalent strain dynamic evolution model, and coupling circulation of a seepage-stress-damage field under the influence of water immersion degradation is represented on the basis of the seepage-stress coupling elastic-plastic damage constitutive model. The technical blank that bidirectional strong coupling of a seepage field and a mechanical field under water immersion response cannot be realized in the prior art is filled, and a high-precision simulation technical scheme is provided for stability analysis of tunnel surrounding rock in a water-rich environment.

The invention discloses a landslide construction simulation method based on finite elements, particularly relates to the field of construction simulation, and realizes whole-process dynamic simulation through GTS-NX software. Firstly, a three-dimensional finite element model is established based on geological exploration data, a Mohr-Coulomb elastic-plastic constitutive model is adopted, and the bulk modulus and the shear modulus are calculated through the elastic modulus and the Poisson's ratio. The initial ground stress is simulated by adopting a self-weight stress field method, and the initial displacement influence is eliminated by adopting a displacement difference method. In construction process simulation, the unit passivation / activation technology is adopted to accurately reproduce the excavation and support time sequence, and cyclic calculation of excavation-stress release-support-balance is achieved. In nonlinear analysis, superposition of an elastic stress field and a plastic stress field is considered, and an unloading influence factor is introduced to correct anisotropy of a deformation modulus. A safety coefficient is calculated through a strength reduction method, a multi-working-condition evaluation system is established, a monitoring data fusion and parameter inversion mechanism is developed, and a three-level early warning system is formed.

The invention relates to the technical field of computer-aided engineering, in particular to a nonlinear efficient iterative solving method for thermal strain load, which is used for solving an obtained finite element equation by using a modified Newton-Raphson method and comprises the following steps of: firstly, establishing a geometric model to be analyzed and performing grid division; the method comprises the following steps: firstly, setting a model to be analyzed, then setting boundary conditions and temperature field change conditions of the model to be analyzed, finally, inputting the conditions into an algorithm solver, solving a nonlinear equation set, iteratively inputting a load continuously according to a modified Newton-Raphson method in the solving process, calculating node displacement until convergence, and solving stress-strain conditions in the welding process according to a material constitutive relation. In the solving process, by judging the size of the two norms of the displacement increment obtained in the adjacent increment step heuristic stage, the convergence of nonlinear solving of the structure is enhanced through the calculation mode, and the solving speed of the nonlinear problem in the thermal elastic-plastic constitutive structure is increased.

The invention relates to the technical field of structural design and strength evaluation of nuclear fusion devices, and discloses an elastic-plastic analysis and strength verification method, device and equipment under multiple working conditions and a medium. Firstly, basic parameters, unit partitions and conditional constraints of a target structure are obtained; next, based on basic parameters, unit partitions and conditional constraints, static nonlinear solution is carried out, a target data set and a load-displacement curve are obtained, different stress stages are abstracted into a continuous gravity loading path, the strength and deformation of multiple working conditions are synchronously evaluated through a set of elastic-plastic analysis process, and the dynamic performance of the gravity loading path is improved. The method is not limited to linear elasticity checking calculation of a single working condition any more, and the actual stress state of the structure is reflected more truly. Then, an allowable gravity amplification factor is determined based on the load-displacement curve. Further, a safety strength elastoplasticity result and a high-risk region are determined based on an allowable gravity amplification coefficient, a target data set, and a load-displacement curve. And finally, based on the high-risk area and a preset reinforcement rule, obtaining a reinforcement scheme.

The invention provides a concrete elastic-plastic damage constitutive model construction method and system, belongs to the field of computers, and solves the problems that in the prior art, an integral or gradient enhanced regularization method is adopted to establish a non-local constitutive model, but the two methods require relatively fine finite element grid division, and numerical value implementation is very difficult. Comprising the following steps: 1, determining a damage variable, nominal stress, effective stress and an elastic-plastic damage stress-strain relationship, and decomposing the effective stress according to tension and compression characteristics; 2, in the effective stress space, a concrete elastic-plastic damage constitutive model is established; and step 3, based on an energy regularization method, determining a tensile damage variable, a compression damage variable and a corresponding stress-strain relationship, and in combination with a plastic loading and unloading rule, constructing a concrete elastic-plastic damage constitutive model based on energy regularization. The invention provides the construction method of the PC box girder concrete elastic-plastic damage constitutive model under the non-uniform constraint, and the application range is wide.

The invention discloses an integrated fan pneumatic-hydrodynamic-servo-elastic-plastic coupling analysis system and method, and belongs to the technical field of offshore fan numerical simulation calculation. According to the method, a coupling model of an offshore wind turbine under the environment load effect is established, a rotor cabin assembly is simulated through a multi-body dynamics method, and interaction of a supporting structure and pile soil is simulated through a finite element method. By introducing a prediction correction loose coupling algorithm, joint simulation between a multi-body system and a finite element system is realized. The method is not only suitable for coupling dynamic response analysis of the offshore wind turbine under the action of conventional wind wave load, but also suitable for elastic-plastic coupling analysis of the offshore wind turbine under the action of extreme typhoon load or earthquake load. In addition, the method not only can be used for coupling analysis of the offshore wind turbine of a traditional steel supporting structure, but also is suitable for integrated coupling analysis of the wind turbine of a novel steel-concrete structure on land or on the sea.

The invention discloses a finite element simulation method for evaluating the reliability of a battery structure, a product and a storage medium. The method comprises the following steps: constructing a battery finite element model comprising a shell and a sealing structure; defining elastoplastic material properties for the shell; applying a pressure load for simulating internal gas production and / or a mechanical load for simulating external impact; after solving, extracting a plastic strain result of the sealing structure area; and evaluating the integrity of the sealing function based on the result. According to the method, the elastic-plastic model is adopted, the limitation that a calculation result is distorted after a material is yielded in traditional linear simulation is overcome, and the plastic failure risk can be accurately predicted; meanwhile, a sealing function failure criterion based on plastic strain is innovatively established, and the problem that sealing performance evaluation of key connection structures such as riveting cannot be achieved is solved. According to the method, a systematic and quantitative safety boundary defining tool is provided for the battery structure design, and the reliability and efficiency of the design are remarkably improved.

The invention relates to a partition loading drilling gas extraction dynamic simulation experiment device and method, and belongs to the field of coal mine safety. The device comprises an experiment cylinder body, a loading device and an air supply device. A hole sealing section confining pressure pressurizing device, an extraction section confining pressure pressurizing device and an axial pressurizing device are arranged in the experiment cylinder body, and the influence of coal body elasticoplastic deformation on permeability is truly reflected by accurately distinguishing stress loading of a hole sealing section and stress loading of an extraction section; the method comprises the following steps: analyzing a stress state, formulating an experimental scheme, preparing an experimental sample, simulating a loading experiment and analyzing experimental data. By combining drilling construction simulation and negative pressure extraction testing, gas emission rules and leakage characteristics under different hole sealing materials, processes and extraction parameters are systematically analyzed. The technology can accurately test the gas emission rule and the air leakage characteristic of drill holes with different hole sealing processes and hole sealing parameters under negative pressure extraction, and provides a scientific basis for optimizing the gas extraction process and improving the extraction efficiency.

The invention provides an elastic-plastic unified description method and system for nonlinear characteristics of surrounding rock considering medium-principal stress, and belongs to the technical field of computer aided design. The method comprises the following steps: carrying out a true triaxial mechanical property test on surrounding rock to obtain a surrounding rock total stress-strain curve, extracting characteristic stress points of the stress-strain curve, and carrying out stage division on the stress-strain curve; constructing a characteristic yield surface in the stress space based on the characteristic stress points; based on the staged characteristics of the stress-strain curve, plastic deformation capacity characterization functions of different stages are constructed respectively, and the plastic deformation capacity characterization functions are used for describing the plastic deformation capacity of the stress-strain curve; and constructing a nonlinear hardening-softening equation to describe evolution characteristics of the characteristic yield surface. According to the scheme, the nonlinear characteristics of the stress-strain curve can be more comprehensively and accurately described under different minimum principal stresses and medium principal stresses.

A rock mass cavern seismic dynamic stability analysis method considering layer vibration degradation comprises the following steps: determining transverse isotropic elastic mechanical behaviors, strength criteria and plastic potential functions of a layered rock mass, and constructing an elastic-plastic degradation constitutive model of the layered rock mass; determining a stratified rock mass layer surface strength parameter calculation formula under the earthquake action, determining a stratified rock mass rock mass strength parameter calculation formula, and establishing a stratified rock mass strength parameter evolution rule considering the layer surface vibration degradation effect; defining a layer damage degree index, and constructing a layered rock mass damage degree evaluation index under the earthquake action; and calculating the earthquake stability safety degree coefficient of the rock mass underground cavern, and determining the earthquake stability safety degree interval of the rock mass underground cavern. According to the method, the layer vibration degradation effect is considered, the safety evaluation result is more accurate, the application range is wide, the principle is simple, the physical significance is clear, the earthquake stability of the rock mass underground cavity is effectively analyzed, and the method has good practical engineering application prospects.

The invention discloses a soft tissue constitutive parameter calibration method in a soft tissue-skeleton bird body model for bird strike simulation, and the method comprises the construction of a soft tissue-skeleton bird body finite element model and finite element reverse analysis based on flat bird strike. Dividing wing bones, leg bones and head and neck parts in the bones of the bird body into hexahedral unit grids, dividing wishbones, pecking bones, fossil protrusions and ribs into shell units, and dividing soft tissues into SPH particles; further obtaining bone elastic-plastic constitutive parameters through a static compression test, and endowing the bone units with the bone elastic-plastic constitutive parameters; an objective function is set as a mean square error between a flat plate center point pressure-time curve obtained by a real bird body impact flat plate test and corresponding curve data calculated by soft tissue-skeleton bird body impact flat plate finite element simulation, and soft tissue constitutive model parameters are inversely calibrated by adopting a genetic algorithm; and model and material parameter support is provided for bird strike simulation of a high-fidelity aircraft structure.

The invention discloses a welding thermal stress simulation method, device, equipment and medium based on a crystal plasticity finite element, and relates to the technical field of welding thermal stress finite element simulation. The method comprises the steps that a sample is prepared according to a specific multi-phase metal material, and phase distribution and crystal orientation information of a two-dimensional plane of the material are obtained through a metallographic experiment; and a three-dimensional multi-grain model is constructed based on the two-dimensional information. According to the method, a crystal plastic constitutive model is adopted to describe the flowing behavior of the material at high temperature, crystal slippage and polycrystal interaction are considered, the influence on the material performance is reflected from the microstructure evolution level, and the problem that the influence on the macroscopic mechanical performance of a microstructure is difficult to capture in welding multiphase metal material simulation is solved; two-dimensional representation is obtained through a metallographic experiment, the Young modulus and rigidity matrix parameters are accurately calculated by combining forward stretching and shear simulation, the rigidity matrix precision is improved, a temperature field area is divided, stress evolution and residual stress are calculated by combining a thermal-elastic-plastic model, and the welding thermal stress calculation precision is improved.

The invention belongs to the technical field of rock mechanical property research, and discloses a rock elastic-plastic damage constitutive model establishment method considering freeze-thaw strength and compaction effect, and the method comprises the following steps: proposing a concept of freeze-thaw strength to comprehensively reflect the freeze-thaw damage degrees of rock at different freeze-thaw temperatures and durations; performing a freeze-thaw test and a triaxial compression test on the rock test piece, recording test data in the triaxial compression test process, drawing a stress-strain curve based on the test data, and constructing a yield function and a hardening rule of the rock test piece based on the strength characteristic parameters of the freeze-thaw rock; establishing a rock elastic-plastic damage constitutive equation considering the freeze-thaw effect and the compaction effect; and determining a parameter expression of the rock elastic-plastic damage constitutive model based on an elastic-plastic theory in combination with freeze-thaw rock triaxial compression test data. According to the technical scheme, the compaction stage and the volume deformation of the frozen-thawed rock can be reflected, and the method has the advantages of being wide in application range and high in prediction precision.

A method for quantitative evaluation of gas seal performance of an annular blowout preventer is provided. The equivalent average contact pressure of the tubing-rubber core sealing surface is acquired based on the principle of equivalent seal contact energy, the tubing-rubber core microscopic contact state is simulated by using elastic-plastic normal flattening contact between the rigid smooth flat plate and the uniformly distributed spherical micro-convex body rough plate, the actual contact area of the single spherical micro-convex body under the equivalent average contact pressure of tubing-rubber core sealing surface is acquired, and then the circumferential width and average height of the microscopic leakage channel at the tubing-rubber core contact interface are acquired, the gas leakage volume rate of gas through the tubing-rubber core interface is acquired by using the parallel plate model in hydrodynamics, and the gas leakage volume rate is compared to the allowable gas leakage volume rate.

The invention relates to the technical field of precision spring manufacturing and automatic control, in particular to a spring forming online control system and method. The system comprises a dynamic modeling module, a disturbance observation module, an impedance decoupling module and a trajectory correction module. The system calculates disturbance torque by constructing a mechanical transmission dynamics reference model and collecting servo parameters; the core of the method is to decouple a material deformation impedance component representing transient rheological characteristics of a wire rod from a disturbance torque, generate a position correction instruction based on an elastic-plastic compensation model, and dynamically adjust a forming track in a current period; according to the invention, the servo motor is multiplexed as a virtual probe, the hysteresis of visual detection is eliminated, the strength fluctuation of the wire rod can be effectively handled, and the product consistency is obviously improved.

The invention discloses a shale reservoir fracturing casing deformation calculation method, and relates to the technical field of shale oil and gas development. The method comprises the following steps: fusing microseism, logging, rock core and drilling and logging data, and constructing a fracture network-geomechanics coupling model; calculating a direction cosine matrix according to the fracture three-dimensional stress and the inclination angle, evaluating an activation risk, and screening out high-risk fractures; the triangular mesh boundary element solves the slippage as a displacement boundary, and an eight-node hexahedron elastic-plastic casing mesh is utilized to iteratively calculate a casing variable and draw a cloud picture; and a micro-seismic data real-time iteration model is newly added along with construction, and the perforation cluster distance, the fracturing scale, the displacement and the well spacing are dynamically optimized. According to the method, a large amount of on-site microseismic data is fully utilized, reservoir fracture fine description and slippage risk analysis are achieved, shaft multi-point casing variable prediction is completed, and key technical support is provided for deep shale gas development fracturing scheme decision and risk avoidance.

A numerical simulation method for the integrity of cement sheath systems in oil and gas wells under alternating temperature and pressure is characterized by the use of extended finite element method (XFEM), concrete damage plasticity model theory, Cohesive element method, and bilinear traction separation criterion, based on elastoplastic theory and plastic damage theory. This method can simulate not only the failure process of the cement sheath-casing interface under alternating temperature and pressure and characterize the mechanical behavior of interface failure, but also the failure process of the cement sheath itself and characterize its mechanical behavior. By comprehensively analyzing the failure behavior of the cement sheath system integrity in oil and gas wells, this method enables a realistic evaluation, prediction, and diagnosis of the integrity of the casing-cement sheath-casing assembly system under alternating temperature and pressure, which helps optimize cement slurry systems, improve cementing quality, and prevent cement sheath integrity failure. This invention is applicable to the field of oil and gas drilling and production engineering technology.

The invention provides a regulation and control method and system for hole wall instability of a horizontal drill hole in a high ground stress environment, and belongs to the technical field of horizontal drilling. The method comprises the steps that a high ground stress hole wall instability model based on elastic-plastic damage mechanics is established, and a high ground stress correction coefficient, a dynamic damage variable and a multi-field coupling equation are introduced into the model; model parameters are corrected in real time based on measurement while drilling data, and the hole wall stability is dynamically predicted; according to the prediction result, the model prediction error can be greatly reduced through the method, the progressive damage process of the rock mass in the high ground stress environment can be accurately described, and the technical problem of inaccurate prediction of a traditional static model is solved. By correcting model parameters in real time and dynamically adjusting a wall protection strategy, the hole wall instability accident rate is reduced, and the drilling operation safety is remarkably improved.

The invention belongs to the technical field of modular buildings, and particularly relates to a simplified modeling and optimal design method for a transverse connection node of a modular building. Comprising the steps that 1, parameters of a test piece are obtained, modeling is conducted through a layered shell unit, key calculation data are obtained, and a constitutive relation of a double-node unit is constructed; step 2, establishing an elastic-plastic finite element model of the high-rise modular shear wall structure; 3, carrying out elastic-plastic analysis on the model, recording structural response, and calculating damage parameters; and 4, judging whether to adjust the component design parameters or not according to the damage parameter limit value. According to the method, a double-node unit constitutive structure of bending / shearing behaviors is constructed through layered shell simulation data, a damage evaluation model under multistage earthquakes is established, the reinforcement ratio and the post-cast section width are optimized based on the damage overrun degree, and a closed loop of the construction model, structural analysis, damage evaluation and parameter optimization is formed. And a design platform with adjustable and controllable anti-disaster performance is provided for the high-rise modular building.

The invention discloses a spiral bevel gear elastic-plastic fluid dynamic lubrication contact analysis and calculation method, device and equipment and a medium, and relates to the technical field of gear detection. Calculating the elastic deformation of the tooth surface in the gear meshing process based on the elastohydrodynamic parameters; calculating the tooth surface roughness distribution of the gear; constructing a mixed time-varying thermal elastohydrodynamic lubrication model of the spiral bevel gear according to the elastic deformation and the tooth surface roughness distribution; on the basis of a mixed time-varying thermal elastohydrodynamic lubrication model of the spiral bevel gear, subsurface stress field analysis and tooth surface morphology updating are introduced, bidirectional coupling iterative calculation of plastic deformation and lubrication behaviors is carried out, and a coupling solving result of a pressure field, oil film thickness distribution and a temperature field in a tooth surface contact area is obtained. According to the method, the influence of elastohydrodynamic lubrication on the contact stress is considered, and the accuracy of spiral bevel gear elastoplastic hydrodynamic lubrication contact analysis is improved.

The present invention discloses a method and related device for optimizing additive manufacturing process parameters based on deformation analysis, relating to the field of additive manufacturing technology. The method comprises: constructing a thermo-solid coupling model based on the heterogeneous material parameters, structural characteristic parameters, and preset processing parameters of a target workpiece; constructing a melt channel model based on the preset processing parameters and structural characteristic parameters to generate a structural mesh of the target workpiece; performing temperature field distribution analysis based on the structural mesh in combination with a heat source model; performing thermodynamic simulation of the deposition process based on the structural mesh and combining it with the thermo-solid coupling model to perform elastic-plastic strain analysis; performing stress-deformation analysis of the workpiece during laser additive manufacturing based on elastic-plastic strain components and temperature field distribution data; and optimizing preset processing parameters based on the stress-deformation data in combination with a multi-objective function to perform laser additive manufacturing of the workpiece. The present invention improves the reliability of processing parameter optimization and effectively enhances the quality of laser additive manufacturing of the workpiece.

The invention provides a laser cladding process parameter determination method based on finite element analogue simulation, and relates to the technical field of surface treatment. Comprising the following steps: importing a substrate material and a cladding layer material into finite element three-dimensional software to construct a corresponding finite element model; setting laser power, a preset temperature and a scanning path of the finite element model to obtain a finite element model of a variable process parameter set; performing finite element simulation by utilizing the final finite element model, and acquiring stress-strain data corresponding to each process parameter by utilizing a nonlinear heat conduction equation and an elastic-plastic stress-strain equation; and determining an optimal process parameter combination according to the stress-strain data. The method solves the problems that in the prior art, laser cladding Ni-60% WC composite powder lacks a systematic and accurate process parameter determination method when applied to the 45 steel surface, so that cracks, air holes and other defects are prone to being generated in a coating, and the comprehensive performance is difficult to stably improve.

The invention discloses an elastic-plastic parameter intelligent inversion method and system based on cloud theory expansion, and belongs to the field of hydraulic engineering intelligent computation.The inversion method comprises the following specific steps that I, an earth and rockfill dam three-dimensional finite element model is established, an elastic-plastic constitutive model is integrated, and meanwhile a monitoring point is selected as an inversion response reference point; iI, acquiring to-be-identified parameters and a change range of the elastic-plastic constitutive model, and constructing a high-dimensional parameter space; according to the method, a stable high-precision inversion effect can be kept in a high-dimensional parameter space, the problems that a traditional method is low in calculation efficiency and prone to falling into local optimum in a complex parameter space are solved, it is guaranteed that the average error of static inversion is lower than 5%, the goodness of fit between dynamic response prediction and actually measured data reaches 90% or above, and the method is suitable for large-scale popularization and application. And the precision and the efficiency of the full-life-cycle safety evaluation of the earth and rockfill dam are obviously improved.

The invention provides a fluid-solid-heat dynamic simulation method for impeller blade particle impact based on multi-physics field coupling, the physics field in the method comprises a fluid field, a heat transfer field and a structure field, coupling simulation is carried out through data exchange among different software, and the process of particle impact on an impeller blade is calculated and analyzed. The method mainly comprises the following steps: importing an impeller model grid file into FLUENT software, setting a turbulence model and the like, setting parameters such as the density and the viscosity parameter of air fluid along with the temperature change, the rotating speed of a fluid domain and the like, and setting the flow speed and the temperature parameter of an air inlet; in EDEM software, parameters such as the material, the number and the particle generation of particles are set; a UDF script is read in the FLUENT software, a coupling switch of the EDEM software is turned on, and bidirectional coupling simulation of data exchange is carried out; and importing the obtained temperature change range into an elastic-plastic thermal coupling material model of LS-DYNA software, and carrying out explicit dynamic simulation by taking the obtained particle movement speed as the initial speed of the particles impacting the impeller.

The invention provides a flanged shaft welding process numerical simulation method and system based on a combined heat source model, and the method comprises the steps: 1, building a combined heat source model; 2, on the basis of a thermal-elastic-plastic theory, a three-dimensional finite element model for flange shaft welding is established according to the combined heat source model; and 3, numerical simulation is conducted on the flange shaft welding process based on the three-dimensional finite element model, and a temperature field, a deformation field and welding residual stress generated in the welding process are analyzed through a sequential coupling analysis method. According to the flanged shaft welding process numerical simulation method and system based on the combined heat source model, a complex molten pool is simulated based on the combined heat source model of an actual weld joint fusion line, the simulation result is more accurate, then the subsequent temperature field analysis result is more accurate, mechanical analysis is more accurate, and further, the simulation result is more accurate. And subsequent simulation results are more suitable for actual welding process guidance.

The invention discloses an intelligent prediction method for welding deformation of a steel bridge deck based on physical-virtual double-domain collaboration and CNN-LSTM fusion modeling, relates to the technical field of welding process optimization and intelligent manufacturing, and aims to solve the problem that traditional welding deformation control mainly depends on empirical formula derivation and finite element thermoelastic-plastic analysis. However, the former is difficult to accurately reflect a nonlinear relation of a complex welding condition, and the latter has the problems of high computing resource consumption, low modeling efficiency and the like, and particularly, the prediction precision and the real-time performance are difficult to meet intelligent manufacturing requirements in the face of a multi-welding-seam coupling effect and a large-scale structure. The invention provides an intelligent prediction method for welding deformation of a steel bridge deck based on physical-virtual double-domain cooperation and CNN-LSTM fusion modeling, and the method comprises the steps: deeply fusing the dynamic mapping capability of the physical-virtual double-domain cooperation and the spatial-temporal feature modeling advantages of a CNN-LSTM fusion model, and synchronously integrating an NSGA-II algorithm to construct a process optimization closed-loop system; and high-precision prediction and process dynamic optimization of the welding deformation of the steel bridge deck are realized.

The invention belongs to the technical field of pressure vessel structure analysis, and particularly relates to an intelligent reduced basis finite element method for rapidly analyzing the deformation behavior of a pressure vessel. According to the method, a finite element method is improved by adopting a reduced basis method, an online and offline combined solution mode is developed, after design parameters such as a structure size, a load type and size, material attributes and the like are preset, a reduced basis space is obtained by adopting an offline solution mode, and then a mapping relation between a reduced basis solution and a finite element solution is established; according to the method, order reduction of a finite element model is achieved, the degree of freedom of a problem is reduced, the calculation amount needed by solving a linear algebraic equation set through a traditional finite element method is greatly reduced while the precision is guaranteed, a Gaussian process regression method is further introduced to describe the elastic-plastic deformation behavior of the pressure vessel, and therefore the deformation behavior of the pressure vessel is rapidly solved.

The invention discloses a wearable monitoring bracelet for preeclampsia early warning, and relates to the technical field of wearable monitoring bracelets.The wearable monitoring bracelet comprises a monitoring bracelet body, a touch control circular screen is arranged in the middle of the top face of the monitoring bracelet body, and splicing end blocks are fixedly connected to the two ends of the monitoring bracelet body; the end parts of the two splicing end blocks are both provided with expansion splicing boxes, the interior of the expansion splicing box at the tail end of the monitoring bracelet main body is filled with an installation elastic rubber box, and one side of the interior of the installation elastic rubber box is provided with a gas pressure intensity sensor. Meanwhile, a universal splicing structure is utilized at the splicing part of the expansion splicing box and the splicing end block, so that a sensor in the expansion splicing box can be replaced as required, and the monitoring bracelet can be used for specially and accurately detecting other vital signs while detecting eclampsia symptoms; and the use safety and smoothness of the monitoring bracelet are further improved.

The invention discloses a heavy haul railway tunnel disease inversion evaluation method, and relates to the technical field of tunnel safety. Comprising the following steps: generating 216 working conditions by adopting an L27 (38) orthogonal table according to 8 types of key variables; establishing a tunnel three-dimensional elastic-plastic damage model based on an ABAQUS platform, wherein the tunnel three-dimensional elastic-plastic damage model is coupled with a dynamic load, a temperature field and a seepage field; inputting 216 working conditions into the three-dimensional elastic-plastic damage model of the tunnel to obtain structural response data; analyzing the structure response data through a Python script, and extracting key features; constructing a disease label data set based on the key features; and constructing a deep learning forward model and a deep learning inversion model containing physical constraints. The technical problems that in the prior art, data sets under the influence of multiple factors are lacked, and an inversion model lacks physical constraints are solved.