58 results about "Finite element algorithm" patented technology

The invention relates to the technical field of electronic manufacturing equipment, in particular to an adaptive thermal compensation system and method for a high-precision mounting head of a chip mounter, and the system comprises a temperature-deformation sensing unit, a thermal-mechanical coupling analysis unit, a dynamic compensation control unit, and a closed-loop execution unit. The temperature-deformation sensing unit collects temperature and deformation data of multiple parts of the mounting head in real time, the thermal-mechanical coupling analysis unit reconstructs a three-dimensional temperature field based on a finite element algorithm, the thermal expansion distribution quantity is dynamically calculated, the problem of rough model of traditional single-point temperature measurement is solved, and the measurement precision is improved. The dynamic compensation control unit predicts the thermal drift amount in the future 5 ms through online parameter identification and a long-short-term memory network model, a compensation strategy is adaptively adjusted in combination with the motion working condition, the closed-loop execution unit decomposes the compensation amount into displacement and torsion correction instructions, accurate offset of thermal deformation is achieved, and a whole-process thermal compensation closed loop is constructed. The precision stability of the mounting head in a complex thermal environment is improved, and the production efficiency is improved.

The invention relates to a system and method for preparing a surgical suture with controllable knotting force based on a slipknot, and the method comprises the steps: weaving a slipknot controller with a specific topological structure at the tail end of the surgical suture, inputting the required knotting force into a preset force calculation system based on a finite element algorithm, and carrying out the calculation to obtain a preset force; the force control stretching device loads the preset force to the prefabricated force bearing end of the slipknot controller until the slipknot controller reaches the preset load, and preparation of the operation suture with the controllable knotting force is completed. The knotting force can be accurately controlled in the actual suture knotting operation, and tissue cutting and ischemia caused by too large knotting force and tissue leakage caused by too small knotting force are avoided. In the suturing process, clear mechanical signals can be provided for surgeons, the consistency and accuracy of knotting operation are improved, and low-age doctors can complete high-quality knotting.

The invention provides a parallel iteration solving method and system for an electromagnetic finite element equation set, and relates to the technical field of electromagnetic finite elements, and the method comprises the steps: constructing a to-be-solved electromagnetic finite element equation set # imgabs0 #; dividing the electromagnetic finite element equation set into a plurality of calculation sub-tasks, and distributing a sub-matrix block # imgabs 1 # and a sub-right-end item vector # imgabs 2 # of the sub-tasks to each process in the super computer; by means of the initialized Hoseholder-GMRES algorithm, the processes are subjected to subtask calculation in parallel, and the local optimal solution # imgabs3 # of each process is obtained; summarizing the local optimal solution # imgabs4 # of each process to obtain an optimal solution # imgabs5 # of the electromagnetic finite element equation set; according to the method, the electromagnetic finite element, the Householder-GMRES algorithm and parallel computing are combined, and the solving efficiency of the linear equation set of the electromagnetic finite element is improved by utilizing a parallel optimization technology.

The invention discloses a sag simulation method and device for a power transmission conductor. The method relates to the field of power data information processing, and comprises the following steps: determining a to-be-deployed target area of a power transmission conductor, obtaining topographic information and meteorological information of the target area, and obtaining attribute information of the power transmission conductor; receiving end point position information of the power transmission conductor deployed in the target area input by a user, and constructing a three-dimensional space model of the power transmission conductor based on the end point position information and the topographic information; constructing a multi-field coupling model of the power transmission conductor based on the three-dimensional space model, the meteorological information and the attribute information; converting the multi-field coupling model into a finite element model to obtain a plurality of mutually connected sub-regions, and solving an equilibrium state of the finite element model through a preset nonlinear finite element algorithm to obtain a node value of each sub-region; and constructing a sag simulation result of the transmission conductor through the node value of each sub-region. Through the method and the device, the problem of relatively low accuracy of sag simulation of the transmission conductor in related technologies is solved.

The control device comprises a control module, an ice melting power supply module, a boundary switch, a short circuit switch and an ice melting switch, the boundary switch, the short circuit switch, the ice melting switch and a protection switch are arranged on a high-voltage cable, and the control module sequentially drives the boundary switch, the short circuit switch, the ice melting switch and the protection switch to execute state switching through action instructions. The conduction control of the ice melting loop is realized; the control module integrates a finite element algorithm function, collects current, voltage and temperature distribution parameters in an ice melting loop in real time, and dynamically corrects ice melting current parameters through three-dimensional electromagnetic-thermal coupling field simulation; setting a parametric modeling unit, and calculating an optimal voltage regulation gear based on a heat balance equation and a Joule heat effect to realize adaptive voltage regulation; the demarcation switch, the short circuit switch and the ice melting switch are arranged, the effect of cable short circuit heating ice melting is achieved by sequentially controlling the on-off states of all the switches, finite element real-time simulation and parameterization voltage regulation decision are combined, and the cable ice melting efficiency, reliability and safety are remarkably improved.

The invention belongs to the field of electromagnetic field numerical solution, and particularly provides a finite element mesh adaptive method for network parameter analysis of a multi-port microwave device, which comprises the following steps: firstly, establishing a geometric structure of the multi-port microwave device, setting simulation frequency, excitation and boundary conditions, and establishing an electromagnetic simulation model; secondly, performing preliminary division and finite element electromagnetic simulation calculation on a computational domain by adopting a tetrahedral mesh to obtain a numerical solution corresponding to each group of excitation, and synthesizing results based on a posterior error estimation method for posterior error estimation; and finally, according to a posterior error indication grid encryption parameter, carrying out simulation calculation again after encryption, and repeating the process until the solution meets the precision requirement. In conclusion, by combining the characteristics of a finite element algorithm and the characteristics of an error estimation algorithm, in the microwave device network parameter analysis process, multiple sets of excited numerical solutions are comprehensively used for posterior error estimation and grid adaptive encryption indication, so that the analysis precision of network parameters is improved.

The invention relates to the technical field of dynamic simulation teaching, in particular to a dynamic simulation teaching system for urban and rural space planning, which comprises a data acquisition unit, an enhanced analysis unit and a multi-modal feedback processing unit. The method comprises the following steps: calculating the load deformation quantity of a component through a finite element algorithm, generating a ventilation efficiency cloud picture and a shadow coverage rate curve in combination with a computational fluid mechanics model and a ray tracing algorithm, analyzing a user operation instruction to trigger stress over-limit early warning, and realizing force feedback and multi-physics field data visualization through VR equipment. The problems of insufficient multi-source data fusion and lack of physical authenticity in traditional teaching are solved, dynamic physical verification and interactive teaching of a planning scheme are realized, and the planning decision ability and engineering practice cognition of students are improved.

The invention provides a method and system for controlling a comb for promoting hair growth based on ultrasonic waves, and the method comprises the steps: simulating vibration wave propagation and interference modes under different comb tooth geometrical shapes and arrangement modes through a finite element algorithm, and obtaining a target phase difference range between adjacent comb teeth; a laser Doppler vibration meter is adopted to obtain vibration waves of the comb tooth group in a resonance frequency parameter range, the distribution condition of a superposition area and a counteracting area of the vibration waves is analyzed, and the modulation frequency of local vibration intensity is determined; a scalp bionic acoustic model is built according to acoustic impedance characteristics of human scalp, local vibration intensity modulation frequency is input into the scalp bionic acoustic model, propagation attenuation of ultrasonic waves in the scalp is simulated, and random sampling simulation is performed on sound field distribution in the scalp.

The invention relates to the technical field of geophysical electromagnetic data exploration, in particular to a three-dimensional time-frequency domain electromagnetic joint inversion method based on a finite element algorithm. The method comprises the following steps: respectively acquiring time domain and frequency domain electromagnetic observation data of a to-be-measured region; dividing a to-be-measured region to obtain a non-structural tetrahedral mesh to construct a time-frequency domain inversion initial model; performing forward modeling calculation on the time-frequency domain inversion initial model to obtain time domain and frequency domain electromagnetic response data; obtaining a time domain electromagnetic data residual error and a frequency domain electromagnetic data residual error, respectively obtaining corresponding adaptive weights, and establishing a joint inversion objective function; performing iterative solution on the joint inversion target function, and calculating an update vector of the inversion initial model; and iteratively updating the initial inversion model until a set condition is met, and completing the time-frequency domain electromagnetic joint inversion. According to the method, the accuracy of three-dimensional inversion is effectively improved through joint inversion, so that the practical effect of three-dimensional inversion is enhanced.

The invention relates to the technical field of antennas, and discloses a simulation analysis method, device and equipment for a whole vehicle antenna and a storage medium, and the method comprises the steps: building a vehicle body model of a vehicle and an antenna model of a vehicle-mounted antenna; importing the vehicle body model and the antenna model into simulation software, and setting simulation parameters of the simulation software; based on a bounce ray algorithm solver and a finite element algorithm solver in simulation software, carrying out simulation analysis on the antenna model and the vehicle body model by adopting an equivalent source technology to obtain a simulation result and exporting the simulation result; and under the condition that the simulation result is consistent with the actual test result, taking the simulation result as a simulation analysis result of the vehicle-mounted antenna. According to the method, the antenna is replaced with the result obtained by solving the antenna through the finite element algorithm solver, further solving is conducted on the vehicle body model, the simulation result is obtained, and compared with simulation analysis conducted through a single algorithm, calculation resources are saved, analysis time is shortened on the basis that the precision of the simulation result is guaranteed, and therefore calculation efficiency is improved.

The invention discloses a gradient combination anti-crack diaphragm wall concrete self-constraint stress optimization design method. The method comprises the following steps: firstly, constructing a BIM three-dimensional structure model comprising material performance, temperature gradient and stress state through three-dimensional laser scanning and core sample detection; then, carrying out stress partitioning based on the model, and calculating a self-constraint stress value and a stress transfer attenuation coefficient of each partition; then establishing an expanding agent proportion optimization model, simulating stress redistribution under different doping amount gradients by adopting a finite element algorithm, and screening a minimum effective doping amount meeting a stress homogenization index; and after the anti-cracking effect is verified through dynamic simulation, a final matching scheme is output. According to the method, the BIM technology and the material gradient design are combined, precise control over the concrete self-constraint stress of the underground diaphragm wall and active optimization of the crack resistance are achieved, the technical problem that traditional homogeneous material design is difficult to adapt to complex stress distribution is solved, and the durability and safety of the underground diaphragm wall structure are remarkably improved.

The invention discloses a polycrystalline material microstructure crack evolution simulation and mechanical property prediction method and system. The method comprises the following steps: establishing a voronoi geometric model of a polycrystalline material containing grain characteristics and microstructure defect characteristics; carrying out spatial distribution modeling on the mechanical property parameters of the polycrystalline material based on a probability statistics theory; importing the voronoi geometric model of the polycrystalline material into a multi-physics field simulation software platform, establishing a complete simulation geometric model for crack prediction based on a phase field fracture theory, and performing phase field solution; setting corresponding material parameters according to the material attributes; and setting corresponding boundary conditions in simulation software to simulate a four-point bending experiment, solving a phase field fracture control equation by utilizing a finite element algorithm, capturing a change rule of a crack propagation path, and recording key mechanical data. According to the method, the polycrystalline Voronoi model is constructed, spatial distribution modeling is carried out on the mechanical parameters of the material in combination with the probability statistics theory, and the non-uniform characteristic of the actual material can be reflected more truly.

The invention relates to the field of laser welding quality monitoring, in particular to a copper-aluminum heterogeneous material laser welding mechanical property prediction model. Comprising the steps that a multi-source data acquisition module acquires laser power, scanning speed and the like in real time through a sensor array; the physical mechanism modeling module is based on a multi-physics field coupling finite element algorithm, utilizes a self-adaptive heat source unit to dynamically compensate copper-aluminum heat conductivity difference, and simulates temperature field and residual stress evolution; the data driving prediction module adopts a dual-channel deep neural network, a first channel inputs a process parameter vector, a second channel inputs a molten pool geometric feature and a thermal cycle vector, and prediction values of tensile strength, elongation and hardness are jointly output through a feature fusion layer; and the online decision feedback module compares the predicted strength with a safety threshold value, generates a process parameter correction instruction through Bayesian optimization, and drives an execution mechanism to perform closed-loop control. A physical mechanism and dynamic feature capture are fused, the problem of high cost of a traditional trial and error method is solved, and prediction precision and process stability are synchronously improved.

The invention discloses a data-driven SOEC electric pile variable-scale modeling simulation method and a data-driven SOEC electric pile variable-scale modeling simulation system. The method comprises the following operation steps of: establishing a three-dimensional multi-physical field coupling model of the SOEC single electrolytic tank; establishing an electrolytic tank agent model based on the SOEC single electrolytic tank three-dimensional multi-physics field coupling model; establishing a three-dimensional geometric model of the SOEC stack; defining multiple physical fields in the stack and setting an agent model, and establishing a three-dimensional multi-physical field coupling model of the SOEC stack; based on a finite element algorithm, SOEC electrolytic cell-pile variable-scale simulation is carried out, and the accuracy of the model is verified by combining pile performance experiment data; and the pile numerical simulation model and the intelligent optimization algorithm are combined to realize optimization of the pile operation parameters and structure. While the model calculation precision and accuracy are ensured, the model calculation amount can be effectively reduced, and the calculation efficiency is improved; on the premise that hardware computing power is not changed, modeling simulation of a larger-scale galvanic pile can be efficiently achieved.

The embodiment of the application provides a kind of high temperature contact-corrosion coupling model construction method, determine the type of high temperature contact corrosion and corrosion internal mechanism;Build force-chemical coupling theory model;Solve the force-chemical coupling theory model using finite element algorithm;Based on the result obtained by solving, build high temperature contact-corrosion coupling finite element model.The scheme, based on irreversible thermodynamics, establishes a force-chemical full-coupling high-temperature oxidation corrosion theory model considering the interaction of contact pressure, reactant (gaseous) diffusion and chemical reaction;The high-temperature corrosion model is realized by finite element using the pre-set UEL module, which can accurately simulate the corrosion evolution law, corrosion morphology characteristics, chemical reaction dynamic process in the contact area during high-temperature contact corrosion process, and the change of contact pressure with reaction process.Meanwhile, it can also accurately present the distribution of stress, strain, contact pressure, reactant and product concentration and other physical fields.

The invention relates to a tooth model attachment removal method based on a harmonic function and a finite element algorithm, which comprises the following steps of: firstly, preprocessing boundary conditions, obtaining internal and external rectangles of a definition domain through a bounding box algorithm, and obtaining boundary conditions of the internal and external rectangles through inverse projection mapping; and simply connecting the boundary of the original triangular mesh with the boundary of the circumscribed maximum rectangle. And for a finite element algorithm, a rectangular grid point interpolation method is adopted as a boundary condition, so that the rectangular boundary condition is closer to an original triangular grid boundary condition, and a rectangular curved surface is reconstructed through a method of everywhere reconciliation on a finite curved surface. And finally, converting the reconstructed curved surface into a relatively regular triangular mesh curved surface through Delou inner triangulation. Compared with an original triangular mesh, the function of removing the tooth model accessories is completed. By removing excessive wrinkles of tooth model accessories and gingiva, the real form of teeth is restored, and a solid foundation is built for subsequently realizing the design of an orthodontic scheme.

The application provides a metal mask and a pattern selection method, device and storage medium thereof. The pattern selection method comprises: processing n different transition region images to obtain corresponding n groups of pattern design parameters for representing the pattern distribution state of the transition region; determining minimum equivalent regions based on the n groups of pattern design parameters, performing mechanical simulation on each minimum equivalent region by using a finite element algorithm to obtain n groups of material properties corresponding to n different metal masks; performing mechanical simulation on the n different metal masks by using the finite element algorithm based on the n groups of material properties to obtain n groups of first deformation variables corresponding to the n different metal masks; determining at least one group of target first deformation variables from the n groups of first deformation variables, and outputting a transition region image corresponding to the target first deformation variable. The computer simulation test method can shorten the product development cycle, reduce the manufacturing cost and improve the research and development efficiency.

The invention discloses a spacecraft structure deformation geometric reconstruction technology based on a PCL point cloud library, and the technology comprises the steps: 1, carrying out the calculation of the deformation of a spacecraft in a stress state through employing a finite element algorithm, so as to obtain a corresponding deformation result file; and 2, carrying out point cloud extraction on the deformation result file, and carrying out geometric reconstruction based on a PCL point cloud library to obtain a deformed geometric entity model. The invention provides a spacecraft structure deformation geometric reconstruction technology based on a PCL point cloud library. A deformation finite element grid is converted into watertight entity geometry through geometric reconstruction, the export format is the international STEP standard, structure modification and grid division can be conducted again through conventional engineering software such as machinery and mechanics, and a watertight three-dimensional geometric model is provided.

The invention discloses a hole cluster design scheme optimization method based on perforation hole sand inlet amount, which comprises the following steps: firstly, obtaining sand fracturing analogue simulation key parameters, then establishing a shale gas horizontal well sand fracturing sleeve internal fluid and sand particle flow mathematical model based on the key parameters, and then designing a plurality of different hole cluster schemes. The method comprises the following steps: establishing a corresponding geometric model, carrying out grid division on each model to obtain a numerical simulation grid, establishing a numerical calculation format of sand-carrying fluid flow in a casing in a horizontal well sand fracturing process by adopting a finite element algorithm, carrying out analogue simulation, and obtaining the sand inlet amount of a single hole of a shaft in a steady state; and finally, according to calculation results of the sand feeding amount of the single hole of different hole cluster design methods, a hole cluster design scheme with the most uniform sand feeding amount of the single hole is optimized. According to the method, the uniformity degree of the sand feeding amount of a single hole in the sand fracturing process is fully considered, the hole cluster scheme is designed based on the uniformity degree of the sand feeding amount of the single hole, and the sand fracturing effect can be improved.

The invention discloses a high-precision ground optical testing system and method for a spacecraft primary mirror profile, and relates to the technical field of spacecraft optical testing, and the system comprises a truss assembly, a primary mirror, a sensing assembly, a vibration exciter, a demodulator and a computer. The vibration exciter is used for loading exciting force to the truss assembly; the sensing assembly is used for collecting strain signals of the truss assembly and the primary mirror. The demodulator is used for demodulating the truss assembly strain signal and the primary mirror strain signal respectively; and the computer is used for carrying out displacement field inversion on the truss assembly strain demodulation signal by adopting a Ko displacement theory algorithm, carrying out displacement field inversion on the primary mirror strain demodulation signal by adopting an inverse finite element algorithm, and superposing a truss assembly inversion result and a primary mirror inversion result to obtain a form reconstruction result, so that form reconstruction of the spacecraft primary mirror structure is realized. According to the invention, the accuracy of displacement field measurement can be improved, and the structural form reconstruction of the spacecraft primary mirror can be accurately realized.

Embodiments of the present application provide a battery electrochemical-mechanical multi-physical field coupling method and device. The method comprises: constructing a gradient weighted smooth field based on the battery data; constructing an equation weak form of an electrochemical field and an equation weak form of a mechanical field based on the gradient weighted smooth field; and constructing a coupling relationship between the electrochemical field and the mechanical field based on the equation weak form of the electrochemical field and the equation weak form of the mechanical field. In this way, the numerical defects of low calculation precision of the finite element algorithm can be solved, and higher calculation precision can be obtained by using low-order tetrahedral elements, thereby greatly reducing the calculation time while ensuring the calculation precision.

The present invention relates to the technical field of electronic manufacturing equipment, and more specifically, to an adaptive thermal compensation system and method for a high-precision placement head of a chip placement machine. The system comprises a temperature-deformation sensing unit, a thermal-mechanical coupling analysis unit, a dynamic compensation control unit, and a closed-loop execution unit. The system uses the temperature-deformation sensing unit to collect temperature and deformation data of multiple components of the placement head in real time. The thermal-mechanical coupling analysis unit reconstructs a three-dimensional temperature field based on a finite element algorithm and dynamically calculates the thermal expansion distribution, solving the model coarseness problem of traditional single-point temperature measurement. The dynamic compensation control unit uses online parameter identification and a long-short-term memory network model to predict the amount of thermal drift within the next 5 milliseconds, and adaptively adjusts the compensation strategy based on motion conditions. The closed-loop execution unit decomposes the compensation amount into displacement and torsion correction instructions to achieve precise offset of thermal deformation, construct a full-process thermal compensation closed loop, improve the precision and stability of the placement head in complex thermal environments, and enhance production efficiency.

The embodiment of the invention provides a construction method of a high-temperature contact-corrosion coupling model. The construction method comprises the following steps: determining a high-temperature contact corrosion type and a corrosion internal mechanism; constructing a force-chemical coupling theory model; solving the force-chemical coupling theoretical model by adopting a finite element algorithm; and constructing a high-temperature contact-corrosion coupling finite element model based on a result obtained by solving. According to the scheme, based on irreversible thermodynamics, a mechanical-chemical full-coupling high-temperature oxidation corrosion theoretical model considering interaction of contact pressure, reactant (gaseous) diffusion and chemical reaction is established; the preset UEL module is used for performing finite element implementation on the high-temperature corrosion model, and the corrosion evolution rule, the corrosion morphology characteristics and the chemical reaction dynamic process of the contact area in the high-temperature contact corrosion process and the change of the contact pressure along with the reaction process can be accurately simulated. Meanwhile, the distribution conditions of various physical fields such as stress, strain, contact pressure, reactant and product concentration and the like can be accurately presented.

The present application relates to a method, device, and computer equipment for post-construction reconstruction of a landslide dam based on physical mechanisms and survey and monitoring data. The method comprises: establishing a landslide dam model of the landslide dam, and obtaining a material parameter set, a borehole data set, and a real dam body deformation data set of the landslide dam; determining the stratum boundary variation range in the landslide dam model based on the material parameter set, the borehole data set, and a finite element algorithm, and determining an initial stratum variation curve within the stratum boundary variation range; predicting dam body deformation based on the initial stratum variation curve and the finite element algorithm, obtaining a predicted dam body deformation data set, and calculating the loss between the predicted dam body deformation data set and the real dam body deformation data set until the loss meets a preset loss condition; and determining the initial stratum variation curve corresponding to the current round of predicted dam body deformation data set as the stratum variation curve. The present method can improve the accuracy of the post-construction reconstruction method of a landslide dam based on physical mechanisms and survey and monitoring data.

The invention discloses a cable structure tension simulation method based on a cooling method, which is a calculation method for simulating the traction tension process of a cable structure in LS-DYNA software by adopting an explicit dynamic nonlinear finite element algorithm by introducing a tool cable with a temperature material attribute into a cable structure finite element model and utilizing the cooling method. Traction tension of a cable structure is a process from loosening to tensioning and is a strong nonlinear process with ultra-large displacement and even mechanism displacement, and a finite element method for a conventional structure is based on a small deformation theory and cannot solve the tension simulation problem of the cable structure. The tool cable is introduced into the tensioning end of the cable structure, the tool cable is made of a temperature material and endowed with a large elastic modulus, the tool cable is cooled, the length of the tool cable is gradually shortened under the action of the temperature, so that the real cable structure tensioning process is simulated, and when the length of the tool cable is close to 0, the tool cable is in a tensioning in-place state. The tool cable introduced in the method fits the actual tensioning process, the whole-process construction process from ground pavement to high-altitude in-place is simulated, the linear expansion coefficient, the elastic modulus, the internal force and the like of the tool cable do not need to be consistent with the actual one and only need to meet the simulation requirement, and the internal force, deformation and the like of the cable structure are the results needing to be focused on.

The present application relates to the technical field of geophysical electromagnetic data exploration, in particular to a three-dimensional time-frequency domain electromagnetic joint inversion method based on finite element algorithm. The method obtains time domain and frequency domain electromagnetic observation data of the region to be measured respectively; the region to be measured is profiled to obtain a non-structural tetrahedral mesh to construct a time-frequency domain inversion initial model; the time-frequency domain inversion initial model is forward calculated to obtain time domain and frequency domain electromagnetic response data; time domain electromagnetic data residuals and frequency domain electromagnetic data residuals are obtained, and their corresponding adaptive weights are obtained respectively to establish a joint inversion objective function; the joint inversion objective function is iteratively solved to calculate the update vector of the inversion initial model; the inversion initial model is iteratively updated until the set condition is reached, and the time-frequency domain electromagnetic joint inversion is completed. The present application effectively improves the accuracy of three-dimensional inversion through joint inversion, thereby enhancing the practical effect of three-dimensional inversion.

The invention discloses an overhead ground wire loss assessment method based on an improved finite element algorithm, belongs to the technical field of overhead ground wire loss assessment, and utilizes a mesh refinement technology to improve the approximation precision of a finite element analysis result; by using a double-variable dimension reduction method, approximate processing of a structural interval stiffness matrix is effectively simplified; the inverse matrix of the structural interval stiffness matrix is solved through Neumann series, an explicit expression of interval displacement response is obtained, and the calculation convergence speed is increased. According to the overhead ground wire loss assessment method based on the improved finite element algorithm, the problems of calculation efficiency, precision, complexity and boundary condition processing of an existing assessment method are solved, and balance of calculation precision and efficiency is achieved; the method is especially suitable for processing nonlinearity and uncertainty problems related to a plurality of interval parameters, and an efficient and accurate solution is provided for loss evaluation of the overhead ground wire.

The invention provides a deep rock hydraulic coupling constitutive model and finite element simulation method. The method comprises the steps that a first relation is determined according to the equivalent bulk modulus of a multiphase medium composite material; determining a second relationship according to the multiphase medium deformation coordination relationship; constructing a coupling equation based on the first relation and the second relation; obtaining a yield criterion and a flow rule according to a Drucker-Prager criterion; obtaining a plastic multiplier according to a consistency principle and a flow rule, and updating the stiffness matrix according to the plastic multiplier; determining coupling equation model parameters through a deep rock mechanical hydraulic coupling test; and performing language writing on the coupling equation through a programming language to obtain a finite element model. According to the method, the dynamic coupling effect among the porosity, the water pressure and the stress environment is quantified, the programming language is combined, secondary development of a finite element algorithm is achieved, and the safety of engineering design and the reliability of safety evaluation are improved.

The invention discloses an intelligent substation noise control system and method based on a composite low-frequency noise reduction structure, and relates to the technical field of intelligent substation noise control, and the method comprises the following steps: building a disturbance response model based on a perturbation finite element algorithm, and predicting a low-frequency standing wave mode; controlling the distribution of the composite low-frequency noise reduction structure based on a low-frequency standing wave mode to carry out noise control; the disturbance response model is constructed by solving an established multi-state finite element matrix; the multi-state finite element matrix comprises a unit rigid matrix, a unit mass matrix and a boundary unit matrix obtained based on parameter perturbation; according to parameter perturbation, effective disturbance variables are screened through boundary low-frequency coherence characteristics, and the problem that when a finite element algorithm is used for predicting the standing wave mode of the transformer substation, boundary disturbance caused by change of the operation state of equipment cannot be reflected, and consequently standing wave mode prediction is not accurate enough is solved.

The invention discloses a hyperboloid cross cable net shape-finding analysis and modular ring truss structure construction method, which comprises the following steps of: analyzing a static balance state of a cable net by adopting a nonlinear finite element algorithm based on a geometric model and a pretension force of a current iteration round; obtaining an internal force value and a node deformation coordinate of each cable section, calculating a standard deviation and a variable coefficient of internal force distribution according to the standard deviation and the variable coefficient, if the standard deviation and the variable coefficient are not converged to a threshold value, analyzing the influence of node coordinate change on the cable force through a sensitivity matrix, solving an optimal coordinate adjustment amount, updating a geometric model, synchronously adjusting a pre-tension force, starting a new round of iteration, and cyclically performing the process, and the standard deviation and the variable coefficient both meet the convergence requirements. And finally, outputting an optimized cable net geometrical shape and an internal force distribution result, and providing an accurate basis for actual construction. According to the technical scheme, the overall process efficiency of the double-curved-surface crossed cable net structure from digital design to industrial construction can be systematically improved.