80 results about "Three dimensional stress" patented technology

The invention provides a deep tunnel excavation physical simulation test three-dimensional stress field real-time prediction method, and relates to the technical field of tunnel engineering. Comprising two stages of model construction and training and model use. In the model construction and training stage, a physical constraint reference model is constructed, and training optimization is completed; and in the model use stage, real-time prediction of a stress field of a deep engineering physical simulation test is realized through the trained and optimized model. The method has breakthrough advantages in the aspects of physical law constraint, real-time monitoring data fusion, training loss stability, boundary stress condition accuracy and the like, and is a high-reliability three-dimensional stress field prediction method oriented to a deep complex environment.

The invention relates to the technical field of hydraulic test of nickel alloy pipes, and discloses a hydraulic test system for a thin-wall nickel alloy pipe. According to the system, in the axial loading state of the thin-wall nickel alloy pipe, a closed water pressure cavity is established through an annular sealing clamp, and then strain distribution data on the surface of the pipe body is collected through a distributed optical fiber sensor array. And constructing a three-dimensional stress field reconstruction model based on the acquired strain distribution data, calculating an equivalent plastic deformation threshold value of the pipe body under different water pressure gradients, adjusting a water pressure loading curve slope parameter according to the equivalent plastic deformation threshold value, and generating a dynamic water pressure loading instruction. And the high-frequency pressure pulse generator executes the instruction, synchronously triggers the X-ray diffractometer to collect lattice distortion data of the tube body, inputs the data into the material microscopic damage evolution model, and outputs a microscopic defect spatial distribution map. And finally, material constitutive parameters of the three-dimensional stress field reconstruction model are corrected based on the atlas, closed-loop feedback control is formed, and multi-dimensional data acquisition and accurate management and control of the thin-wall nickel alloy pipe hydrostatic test are achieved.

The invention provides a coal mine roof dynamic monitoring and early warning method and system based on artificial intelligence, and relates to the field of coal mine safety, and the method comprises the steps: collecting a stress waveform and a displacement waveform of a coal mine roof, extracting stress loosening characteristics, and constructing a three-dimensional stress conduction strength field; identifying a stress sudden change transition point by using a recurrent neural network to form a stress conduction chain; analyzing a regional topology migration rule and extracting a stress field instability path; matching with historical data to determine a prediction window; and continuously verifying the instability path and generating a support reinforcement scheme. The coal mine roof instability risk can be predicted in advance, and the early warning accuracy and timeliness are improved.

The invention provides a data processing method and system based on intelligent construction, and relates to the technical field of intelligent construction.The method comprises the steps that viscosity, a temperature peak value, temperature and humidity and time delay distortion data in the solidification stage are collected in real time in the concrete pouring construction process, and a material stress relaxation model is constructed to calculate three-dimensional stress distribution; meanwhile, mapping sound wave time delay distortion data into a spatial topological graph, and extracting propagation anomaly features by using a space-time graph convolutional network; and generating a crack risk distribution diagram by fusing stress distribution and abnormal characteristics, and finally, accurately positioning a potential defect area according to risk gradient change. The early warning capability of concrete construction quality defects is improved.

The invention provides a machining cutter feeding speed control method and system.The method comprises the steps that a three-dimensional stress field, a temperature field and cutter micro-vibration characteristics of a cutter cutting area are collected through a preset sensor array, and real-time plastic deformation parameters of a workpiece material and machine tool spindle power fluctuation data are combined; forming a corresponding processing state sensing matrix; obtaining a machining constraint condition of the tool, and optimizing the initial particle swarm algorithm through the machining state sensing matrix and the constraint condition to generate a corresponding target particle swarm algorithm; a speed reference curve matched with the cutter is generated in real time through a target particle swarm algorithm, and cutting noise spectrum features are collected through a high-frequency sonic sensor; and performing conversion processing on the speed reference curve and the cutting noise spectrum characteristics to generate a feeding speed matched with the cutter in real time. The feeding speed can be accurately controlled, and the production efficiency is correspondingly improved.

The invention provides a novel multi-source information and damage coupled coal mine rock burst prediction method. The method comprises the following steps that rock mass fracture signals, a three-dimensional stress field and acoustic emission parameters are collected in real time through a micro-seismic monitoring array, an optical fiber stress sensor and a rock sound probe; an LSTM-attention fusion module is adopted to carry out spatio-temporal feature extraction on the collected multi-source data, an attention weight coefficient is generated, and a weighted fusion feature vector is output; calculating the rock mass damage degree based on a statistical damage mechanics Weibull distribution theory; based on the law of conservation of energy and the damage mechanics theory, a dynamic energy threshold function is constructed, the mining time effect and the rock mass damage state are incorporated into a quantitative evaluation system, and a dynamic energy accumulation rate threshold function is established by introducing a time accumulation effect and a damage coupling term; when the real-time energy accumulation rate is larger than or equal to the energy accumulation rate threshold value and the time derivative of the energy accumulation rate is larger than the sudden change threshold value, third-level early warning is triggered. According to the invention, advanced accurate early warning of the rock burst can be realized.

The invention relates to the technical field of grouting tests, in particular to a three-dimensional high-pressure splitting grouting test method, which comprises the following steps: laying a rock mass sample in a large cubic test box, and applying a stable three-dimensional stress field to the sample in three directions by using a multi-hydraulic cylinder array; grout is injected in a stress maintaining state, grouting pressure, grouting flow and hydraulic cylinder data are synchronously collected to generate a pressure-flow-time relation curve, and meanwhile the grout diffusion process is directly observed through a visual window. According to the method, boundary interference is effectively reduced through a large-size sample and uniform loading, so that slurry is naturally diffused in a stress environment close to a real stratum. The dynamic stress compensation technology maintains boundary stability, and ensures that splitting expansion is not influenced by artificial constraint. A pressure-flow-time curve is combined with visual observation, and the diffusion rule of slurry in a three-dimensional stress field is clearly presented. According to the method, a test means closer to reality is provided for the underground engineering grouting process, and the reliability of grouting parameter design is remarkably improved.

The invention relates to the technical field of engineering structure health monitoring and artificial intelligence, and discloses an offshore wind turbine tower drum base three-dimensional stress distribution prediction and visualization method, which comprises the following steps: generating batch working conditions by presetting a bending moment range and an interval, and calling a finite element software automation script to execute static analysis; node stress values are extracted and integrated into a structured training data set; customizing neural network training: constructing a full-connection network, and training a model by adopting a standardized preprocessing and early stop mechanism; generating an interactive cloud picture: generating a 3D stress cloud picture HTML (Hypertext Markup Language) file supporting rotation / zooming / data query based on a spatial interpolation algorithm and a Plotly tool, and automatically marking the coordinate and the numerical value of a maximum stress point; and end-to-end system deployment: packaging as a Flask Web application, and inputting a bending moment value by a user to generate an interactive cloud picture in real time. The stress analysis period is greatly shortened, the engineering application threshold is reduced, and rapid evaluation and remote cooperation of the offshore wind turbine tower drum base can be efficiently supported.

The invention provides a true triaxial stratified rock disturbance damage anisotropy model and a numeralization method, and the method comprises the following steps: S1, carrying out a true triaxial static test, and researching a peak intensity rule; s2, carrying out a true triaxial multistage disturbance test, and analyzing a disturbance critical intensity rule and anisotropic disturbance damage evolution characteristics; s3, establishing an anisotropic disturbance damage evolution equation; s4, constructing a stratified rock maximum failure constitutive equation under the true three-dimensional stress; s5, constructing a viscoelastic constitutive equation in which the true three-dimensional stress disturbance effect is introduced; s6, compiling the constitutive model established in S5 into a numeralization subprogram; s7, obtaining the maximum failure function parameter of the stratified rock in the peak state; s8, acquiring a three-dimensional disturbance yield function parameter of the stratified rock in a disturbance critical state; and S9, verifying the prediction effect and applicability of the model on the stratified rock disturbance deformation evolution. According to the invention, theoretical characterization of true three-dimensional stress, dynamic disturbance and spatial stratified coupling effect of stratified rock mass deformation and failure is realized.

The invention relates to the technical field of connectors, and provides a connector test damage detection method, a connector and an electric meter box, the detection method comprises the following steps: using an ultrasonic phased array probe to carry out full-matrix capture scanning on the connector subjected to a physical test so as to obtain internal ultrasonic original data; based on the internal ultrasonic original data, reconstructing a three-dimensional acoustic image by adopting a full focusing method, and calculating a first three-dimensional stress field according to the three-dimensional acoustic image; establishing a parameterized three-dimensional finite element model of the connector, and running explicit dynamics simulation on the parameterized three-dimensional finite element model to calculate a second three-dimensional stress field; performing voxel-to-voxel subtraction on the first three-dimensional stress field and the second three-dimensional stress field to generate a three-dimensional stress difference field; according to the local stress difference peak value in the three-dimensional stress difference field, whether damage exists in the connector or not is diagnosed, and the damage position is positioned. Therefore, the problem of testing stress damage in the connector is solved.

The invention discloses a three-dimensional failure criterion construction method considering bedding and three-dimensional stress and intermediate principal stress effect degradation, and the method comprises the steps: S1, obtaining rock strength data through true triaxial static tests under different bedding dip angles, direction angles and intermediate principal stress; s2, constructing a transverse isotropic strength characteristic function based on the spatial relationship between the bedding structure and the loading direction; s3, introducing an intermediate principal stress degradation parameter, and establishing a rock failure criterion considering three-dimensional stress and intermediate principal stress effect degradation; s4, constructing a three-dimensional failure criterion considering bedding space and three-dimensional stress and intermediate principal stress effect degradation; s5, determining model parameters by fitting static test data, and drawing a strength evolution curve; and S6, based on the three-dimensional failure criterion parameters, drawing a stratified rock strength prediction curve. According to the method, quantitative characterization of true three-dimensional stress, middle principal stress degradation and bedding three-dimensional space effect coupling of the strength of the layered rock is achieved for the first time.

The invention belongs to the technical field of oil and gas field exploration and development, and discloses a fractured-vuggy reservoir ground stress prediction method and system based on discrete elements and finite elements. And taking the obtained boundary stress direction and size as boundary conditions, and combining with a pre-constructed fusion model to obtain the three-dimensional stress of the research area, thereby completing the fracture-vuggy reservoir crustal stress prediction process. The construction process of the fusion model comprises the steps that firstly, a discrete fracture network model and a geomechanical grid model are established, then the discrete fracture network model and the geomechanical grid model are fused, after fusion, three-dimensional heterogeneous parameters are given to the fusion model, and the construction process of the fusion model is completed. The method can accurately and efficiently simulate the three-dimensional distribution rule of the current stress field of the fracture-vug type reservoir, and is of great significance to oil-gas exploration and development.

The invention discloses a cutting control method for a steel structure product, which comprises the following steps: collecting data of a steel structure, establishing a three-dimensional stress field according to the collected data of the steel structure, and generating a three-dimensional stress distribution diagram by the three-dimensional stress field; collecting the heat conductivity coefficient and the heat diffusivity of the steel, and establishing a heat conduction model according to the heat conductivity coefficient and the heat diffusivity; identifying a stress sensitive area according to the three-dimensional stress distribution diagram, and planning a cutting path according to the three-dimensional stress distribution diagram and the stress sensitive area; an active heat management system is designed, the active heat management system comprises a temperature sensor, a cooling liquid spraying device and a control system, and heat input and heat dissipation strategies can be more accurately designed by researching stress heat conduction characteristics, so that the phenomena of local overheating and heat stress concentration are reduced.

The invention relates to a finite element calculation method and system based on the local contact condition of a ball tile and a mushroom head, and the method comprises the following steps: S1, calculating the bottom pivot loads Bx, By and Bz of a miter gate, and calculating a horizontal resultant force B0 and an included angle beta between the B0 and the Bz; s2, creating a three-dimensional model of the ball tile and endowing material attributes; s3, creating a 2beta auxiliary model and endowing material attributes; s4, creating an assembly of the ball tile and the 2beta auxiliary model; s5, applying loads B0 and Bz on the outer surface of the ball tile; s6, completely constraining and fixing the non-contact surface of the 2beta auxiliary model; and S7, calculating and solving, and displaying the Mises three-dimensional stress nephogram of the ball tile in an isolated manner. According to the method, the 2 beta local contact area and the sliding / separation-free mode contact mode are adopted, the real working state of the bottom pivot is closer to, the defect that the result is too large due to the fact that only two parameters of the minimum thickness and the Poisson ratio of the top of the ball tile are considered in empirical formula calculation is overcome, the defect that the result is too small due to the fact that the result is too ideal under the complete constraint condition is overcome, and the calculation efficiency is improved. The calculation precision is improved.

The invention discloses a rock structure and three-dimensional stress-strain field evolution visualization method based on digital twinning. The rock digital twinborn model is constructed by fusing an in-situ loading CT scanning experiment, three-dimensional digital image correlation method (3D-DIC) surface deformation field measurement, digital volume image correlation method (DVC) internal deformation field measurement, digital modeling and numerical simulation technologies and methods. And obtaining mesomechanics parameters of the numerical model in real time, synchronously performing mirror image simulation, generating a four-dimensional dynamic body image with space-time continuity, and realizing visualization of the whole evolution process of the rock internal structure and the three-dimensional stress-strain field.

The present application relates to the technical field of structural stress precision measurement, and particularly relates to a steel structure stress monitoring method based on distributed optical fiber sensing, comprising the following steps: step 1: constructing a sensing optical fiber array in a steel structure node area; step 2: injecting an optical pulse into the sensing optical fiber array, and synchronously collecting Brillouin frequency shift signals and Raman scattering signals of each point; step 3: separating temperature and mechanical strain based on a reference optical fiber signal: globally compensating for temperature for a first optical fiber group, and compensating for a temperature gradient along an optical fiber path for a second optical fiber group; step 4: decomposing the compensated mechanical strain into multi-directional strain components according to the spatial orientation of the optical fiber, and reconstructing a three-dimensional stress field through strain component fusion; and step 5: dynamically determining damage risk according to a local stress concentration coefficient in the stress field and a change rate thereof. Through the temperature compensation technology, the influence of environmental temperature change on strain data is eliminated, and the reliability of the monitoring result is improved.

The present disclosure relates to a method and device for predicting a three-dimensional stress-strain curve by using an ultrasonic wave. More specifically, the method comprises the steps of: emitting an ultrasonic signal to a local area of a specimen with an ultrasonic transceiver to measure an ultrasonic signal; inputting the measured ultrasonic signal to an artificial intelligence model that has been trained to calculate and output a first parameter on the basis of an input ultrasonic signal; inputting the first parameter to a Ramberg-Osgood model when the first parameter calculated on the basis of the measured ultrasonic signal is output from the artificial intelligence model; scanning the ultrasonic transceiver to repeatedly perform each of the above steps for the next local area of the specimen when a second parameter calculated on the basis of the first parameter is output from the Ramberg-Osgood model; and visualizing a three-dimensional stress-strain curve for the entire area of the specimen when all the second parameters for the entire area of the specimen are collected.

The invention provides a non-contact chip interconnection structure stress test method and system, and relates to the technical field of chip testing, and the method comprises the steps: generating an energy source selection instruction based on the material attribute of a chip interconnection structure, applying a dynamic load, and synchronously collecting an original signal set which comprises a deformation response parameter and temperature field distribution; performing feature decoding on the deformation response parameter to generate a physical feature vector; reconstructing a three-dimensional stress tensor field according to the physical feature vector and the temperature field distribution, and performing position marking in the reconstructed three-dimensional stress tensor field to obtain a risk position coordinate set; generating a parameter optimization instruction based on the temperature rise distribution of the risk position coordinate set, feeding back the parameter optimization instruction, and performing parameter optimization; and carrying out dynamic function conversion and damage accumulation integration based on the three-dimensional stress tensor field after parameter optimization, and outputting a quantitative life and risk position coordinate set. According to the method, the accuracy, the reliability and the comprehensiveness of the stress test of the chip interconnection structure are remarkably improved.

A cylindrical side-wall core is acquired from an inner circumferential surface of a well at a predetermined depth from a ground surface. First, second and third measurement cross sections spaced apart in a longitudinal direction of the core are set. In each cross section, the length of the maximum diameter of the cross section where the amount of distortion relative to the diameter of a standard circle is largest and the length of the minimum diameter where the amount of distortion relative to the diameter of the standard circle is smallest are measured. Six independent components among stress tensors for defining three-dimensional stress elements are obtained using an equation representing a difference between maximum and minimum stresses acting on the side-wall core along each cross section and another equation representing the angle between the well excavation direction and the action direction of the maximum stress on each cross section.

The invention discloses a metal material stress distribution visualization method, system and device, and relates to the technical field of image generation, and the method comprises the steps: obtaining discrete stress-strain data points obtained through measurement of a metal material, building a biharmonic partial differential equation, and defining natural boundary conditions of the biharmonic partial differential equation; discretizing the biharmonic partial differential equation on the two-dimensional computational grid, and constructing and solving a linear equation set to obtain a basic stress distribution curved surface; constructing a fluctuation mode function containing sine and cosine functions, and performing linear superposition on the fluctuation mode function and the basic stress distribution curved surface to generate an enhanced stress distribution curved surface; calculating geometric attributes of the enhanced stress distribution curved surface, mapping the geometric attributes into optical rendering attributes, and generating a realistic three-dimensional stress distribution curved surface; the three-dimensional stress distribution curved surface and the contour line are displayed in an overlapped mode, and a three-dimensional stress distribution cloud picture of the metal material is output; the method effectively solves the technical limitation that a traditional two-dimensional chart is difficult to display the internal stress distribution state of the material.

The invention relates to the technical field of structure health monitoring, and discloses a boiler body and steel frame structure stress-strain monitoring system and an early warning method, and the system comprises an acoustic-electric bimodal high-temperature piezoelectric resonance sensor array, a signal demodulation unit, a health state diagnosis unit, a cloud analysis platform and an early warning generation unit. According to the invention, the instantaneous temperature is obtained by using the quasi-static capacitance calculated by the electrical modal response, the mechanical resonant frequency identified by using the acoustic modal response is combined with the instantaneous temperature and decoupling to obtain the real strain, and meanwhile, the connection state and the structure damage state of the sensor are diagnosed by using the quality factor of the acoustic modal and after temperature normalization. The cloud analysis platform reconstructs a three-dimensional stress field and predicts the residual life based on the real strain and damage state, and finally generates a graded early warning signal, thereby achieving the precise decoupling of high-temperature strain-temperature and the dual diagnosis of the system-structure, and improving the monitoring accuracy and reliability.

The application relates to a kind of all-around three-dimensional stress testing device and method based on liquid pressure transmission principle, which includes liquid cavity pressure transmission module, involves the deformation induction and stress calculation of each local azimuth, and stress pressure sensing module, which involves the all-around azimuth stress integrated calculation of target measuring point.The liquid cavity pressure transmission module and stress pressure sensing module can make three-dimensional stress calculation cover to each azimuth stress, reduce the stress measurement error caused by the difference of particle size, the anisotropy of soil body and the interference of soil deformation.The improvement of stress testing precision significantly improves the actual data testing efficiency of test, and provides convenience for the fine processing and analysis of soil stress testing data.

The application provides a deep and shallow buried division method and system of underground engineering based on tunnel excavation effect, and belongs to the technical field of computer-aided design. The scheme comprises the following steps: obtaining an initial ground stress field of a tunnel area; sampling the tunnel area, carrying out a conventional triaxial test, and obtaining a full stress-strain curve of surrounding rock; obtaining ground stress information of a given engineering section according to the initial ground stress field of the tunnel area, establishing a three-dimensional numerical model of the tunnel, carrying out numerical simulation by using a constitutive model considering strain softening, and obtaining a stress field after tunnel excavation; and based on the full stress-strain curve and the stress field after tunnel excavation, deep and shallow buried division is carried out. The scheme fully considers that the occurrence of tunnel disasters under strong tectonic stress is significantly affected by true three-dimensional stress, considers the tunnel excavation effect, carries out deep and shallow buried division based on the true three-dimensional stress field, provides clear suggestions for the selection of the constitutive model of surrounding rock in the design process, and provides clear guidance for support design.

This invention provides an adaptive optimization method for the synthesis of three-dimensional geostress at the intersection of three boreholes in high-altitude valleys, belonging to the field of geotechnical engineering and engineering geological data inversion technology. Based on multi-pore two-dimensional stress data, this invention constructs a system of linear equations for three-dimensional stress synthesis and performs data quality diagnosis based on the weighted least squares benchmark solution. Depending on the risk and severity of outliers, two optimization paths are adaptively selected: particle swarm optimization combined with Huber robust loss to suppress the influence of outliers, or Levenberg-Marquardt iteration combined with piecewise regularization and physical constraint penalties to ensure numerical stability and geological rationality. This invention achieves adaptive and robust solutions for three-dimensional geostress synthesis under complex terrain conditions, providing a more reliable geostress input for the stability evaluation of underground engineering in high-altitude valleys.

The present application relates to the technical field of three-dimensional graphics data processing, and particularly relates to a three-dimensional ground stress modeling method, system and storage medium. The method comprises the following steps: constructing a three-dimensional space grid model of a geological structure, and marking the spatial parameters of stratum, fault and fissure distribution; inputting the spatial parameters into a preset probabilistic mechanics model to generate a multi-scale fissure field; embedding the multi-scale fissure field into an initial tensor field of a preset three-dimensional stress field to generate continuous stress distribution data containing a crack propagation path through fracture evolution simulation; constructing a numerical updating strategy of fluid-solid coupling based on the continuous stress distribution data to solve the fluid pressure field and the solid stress field in a coupled manner and update the three-dimensional stress field. Through the fusion of multi-scale fissure analysis, fracture evolution tracking and fluid-solid coupling solution, the present application realizes the dynamic reconstruction and three-dimensional visualization of the stress field of the geological structure, and significantly improves the accuracy and expression ability of the ground stress distribution under complex geological conditions.

The invention relates to the field of a stress calculation method of an underground pipe column, in particular to a three-dimensional stress field real-time calculation and safety evaluation method and system of the underground pipe column, and the method comprises the steps: collecting underground multi-source data; three-dimensional stress calculation is carried out on the basis that the tubular column material is isotropic and the stress-strain relation conforms to the linear elasticity theory; correcting a safety assessment result by taking the yield strength as a constraint condition, calculating thermal stress according to the temperature change values of the well bottom and the well mouth, and correcting the total stress; radial stress is corrected by combining radial pressure difference caused by internal pressure and external pressure, thermal stress is corrected in real time according to temperature change values of a well bottom and a well mouth, corrosion rate is calculated according to change of corrosive gas content, and a stress distribution result is corrected; and performing risk grading and early warning according to the relationship between the total stress and the yield strength. According to the method, precise modeling and calculation are carried out on the superimposed effect of stress in different directions, and the calculation precision is remarkably improved.

This invention relates to a laser-based detection-based method for controlling the eccentricity of cable insulation layers, aiming to solve the problem of difficult eccentricity control caused by the unstable flow of molten polymer. The core scheme involves embedding a micro-stress sensor array in the extruder head to simultaneously collect multiple process parameters such as stress, temperature, pressure, and tension, integrating them into a multi-source raw dataset. A high spatiotemporal resolution dynamic stress field is reconstructed through spatiotemporal fusion, interpolation, and rheological correction. Furthermore, a physically meaningful three-dimensional stress fingerprint vector is extracted, and a response spectrum between stress and eccentricity evolution is constructed by combining historical calibration data, enabling real-time prediction of eccentricity trends. Based on the prediction results, servo-driven compensation adjustment is implemented in the extruder head to achieve dynamic feedforward control of concentricity, and model fine-tuning is performed based on laser detection feedback. This method improves the uniformity and process adaptability of insulation layer forming, and reduces the risk of eccentricity defects caused by fluctuations in operating conditions.

The application belongs to the technical field of stress field equipment for tunnel physical simulation test, and specifically discloses a complex stress field tunnel model test loading device and a test method. The device comprises a loading assembly arranged on the surface of a supporting plate, the loading assembly is attached to the surface of a tunnel physical model to be loaded, and the non-uniform stress field of the surface of the tunnel physical model to be tested is realized by adjusting the loading assembly under the action of external load. The loading assembly comprises a loading frame, a compression column and a unit ram. The surface of the loading frame is provided with mounting holes, the compression column is arranged in the mounting holes, and the end of the compression column close to the tunnel physical model to be tested is connected with the unit ram. The compression column is composed of micro-unit bodies with different elastic modulus ratios. The three-dimensional stress field required by the physical model test is obtained according to the real stress field of the tunnel engineering prototype through the similarity theory, and the three-dimensional stress field of the physical model is divided into units and normalized to determine the different elastic modulus ratios. The device can realize non-uniform loading of the complex stress field.

The application belongs to the technical field of long-term drift suppression of fiber-optic gyroscope zero bias and scale factor, and particularly relates to a long-term drift suppression method for equivalent sensitive area of a fiber coil. A homogenization, de-homogenization analysis idea and a finite element analysis approach are adopted to establish, verify and calibrate thermodynamic parameters of each non-metallic material of the fiber coil. A mathematical model of long-time drift of circumferential strain, radial strain and three-dimensional stress of a micro-element section of the fiber coil with time, temperature and other environmental conditions is calculated to obtain long-time drift of effective refractive index of each micro-element section. Finally, average long-time drift and dispersion characteristics of the effective refractive index of the fast axis of the fiber coil are obtained, so that long-time drift characteristics of the scale factor of the fiber-optic gyroscope are analyzed. In turn, according to the model, thermodynamic parameters and geometric proportions of each non-metallic material of the fiber coil are optimized to finally realize long-term drift suppression of the equivalent sensitive area of the fiber coil.

The invention discloses a camera for capturing a three-dimensional stress field of a structure. The camera comprises an image capturing device and a three-dimensional stress field acquisition algorithm. The image capturing device comprises a camera and a boundary condition extraction algorithm; the boundary condition extraction algorithm can accurately obtain the difference between the state space of the feature points and the initial state. A physical AI method is adopted in the three-dimensional stress field acquisition algorithm, structural three-dimensional stress field information is acquired through the change of a feature point state space, and global perception is achieved; the physical AI adopts a physical simulation mode to obtain the deformation characteristics of the structure, then the model is exported as a VTK file, and finally the edge deployment of the physical AI on the camera side is realized; gPU acceleration, multi-thread parallel computing and memory preloading schemes are adopted for edge deployment, it is ensured that the response time of edge computing nodes is at the millisecond level, and visualization of a three-dimensional stress field can be smoothly achieved.