477 results about "Fiber orientation" patented technology

The invention discloses a method for testing mechanical properties of a carbon fiber reinforced composite material based on image recognition, and relates to the technical field of material tests.The method comprises the steps that a carbon fiber sample of a fiber laying layer is prepared, the width tolerance is controlled through laser cutting, and speckle patterns are sprayed on the surface; training a U-Net + + neural network based on the collected macro / micro image, and analyzing the dynamic change of the fiber angle in real time; fusing the acquired macro / micro image with the dynamic change of the fiber angle, and constructing a constitutive equation of dynamic fiber orientation distribution; and importing the constitutive equation into a finite element model, iteratively optimizing the fiber-matrix interface strength parameters through inversion calculation, performing blind test verification on the sample by using the optimized finite element model, and outputting a cross-scale correlation test report. According to the method, an interface strength parameter is subjected to inversion iteration optimization through a finite element model, a macro-micro strain field, a fiber slip angle and an interface damage parameter are integrated through a cross-scale correlation test report, and full-chain data support is provided for a composite material structure.

The invention discloses a computer numerical simulation method, system and equipment for a composite material, particularly relates to the technical field of analog simulation, and is used for solving the problem of simulation distortion caused by neglecting the randomness of a microstructure in the prior art. The method comprises the following steps: acquiring microstructure image data of a composite material, extracting fiber arrangement direction and pore distribution parameters, and generating a fiber direction probability density function and a pore topological relation; constructing a non-uniform grid model constrained by a local coordinate system according to the fiber direction probability density function; identifying a weak connection area based on a pore topological relation and marking nodes; applying dynamic decoupling constraint to the weak connection area, wherein the dynamic decoupling constraint comprises initial rigidity and rigidity attenuation rate; applying an external load to the model and calculating a real-time stress coefficient of the weak connection area; dynamically adjusting the constraint parameter through threshold judgment and iterative correction until the stress coefficient is converged; and finally, outputting a corrected macroscopic mechanical property result.

The invention provides a recycled carbon fiber quality detection method based on machine vision, and the method comprises the steps: obtaining a surface image of a carbon fiber bundle through a machine vision method, and carrying out the preprocessing of the image, including image denoising and enhancement; for the preprocessed surface image of the carbon fiber bundle, extracting the morphological characteristics of the fiber bundle, including fiber bundle surface texture and fiber orientation distribution, for representing the morphological change of the fiber bundle under the reciprocating bending stress; acquiring a scattered light intensity distribution image on the surface of the carbon fiber bundle, and extracting spatial distribution characteristics of scattered light intensity through an image segmentation method, including uniformity and continuity of scattered light intensity distribution; if the fracture risk exists, positioning the identified high-risk area, and collecting image data of the high-risk area; according to the high-risk area image data, scattered light intensity distribution characteristics are extracted, a quantitative relation between scattered light intensity space distribution and the fiber bundle fracture risk is established, and a quantitative index for evaluating the fiber bundle fracture risk is obtained.

The invention relates to the technical field of degradable flowerpots, in particular to a plant fiber mould pressing flowerpot and a manufacturing method of the plant fiber mould pressing flowerpot. 10 to 20 parts of a composite binder; wherein the plant fiber comprises at least one of straw and wheat straw, and the length of the straw and the wheat straw is 5-10 mm; the composite binder comprises the following components in parts by weight: 60-80 parts of modified urea-formaldehyde resin; 15 to 25 parts of epoxy resin; according to the plant fiber flowerpot, the plant fiber flowerpot with the height of 15 cm or above is successfully manufactured, and the industry blank is filled up; balanced strength distribution from bottom to top is achieved through fiber orientation and gradient density forming. The composite binder system obviously reduces the water absorption rate of the flowerpot and prolongs the service life of the product; the degradation speed is accurately controlled by regulating and controlling the ratio of the plant fibers to the binder.

The invention discloses a melt spinning cooling system which comprises a spinning box, a cooling cylinder section, a first heating assembly, a second heating unit and a recovery part, the first heating assembly outputs trace hot nitrogen, anti-oxidation protection of melt trickles is achieved, the oxidation risk possibly caused by direct contact of a traditional cooling medium is avoided, and the cooling efficiency is improved. Meanwhile, the second heating unit is matched to regulate and control the temperature of the cooling cylinder section, so that the whole-process temperature accurate control from oxidation prevention to high-temperature natural cooling and the high-temperature natural cooling and cold air supply-free operation process are realized, and the solidification orientation length and process of the melt trickle can be actively lengthened by combining gradient process temperature control; different from the defect of insufficient orientation caused by too fast cooling in the prior art, key conditions are provided for optimization of a fiber orientation structure; due to the coaxially stacked cooling cylinder sections and nitrogen recovery operation, a stable cooling environment is constructed, fiber shaking is avoided, the nitrogen utilization rate and the environmental safety are improved, and the process stability and economical efficiency are balanced.

The invention relates to an intelligent wind power blade defect identification method based on phased array detection, which aims at the anisotropic characteristic of a wind power blade glass fiber reinforced composite material, and can flexibly adjust the sound beam angle, effectively penetrate through the material and inhibit the scattering of an ultrasonic signal through a low-frequency linear array probe with characteristic parameters and an electronic focusing technology. Defects in different directions such as impurities perpendicular to layers, cracks in the fiber direction, wrinkles and the like can be accurately detected, meanwhile, by combining wavelet packet transformation noise reduction and a feature extraction algorithm, the distinguishing capacity of defect echoes and noise in complex materials is remarkably improved, the method is adaptive to complex structures and material characteristics of wind power blades, the application range of the detection technology is expanded, and the detection efficiency is improved. An ultrasonic phased array detection technology and an intelligent algorithm (a K-means clustering algorithm and a YOLOv8 target detection model) are deeply fused, the limitation that traditional detection depends on manual analysis is broken through, and a full-process automatic detection system of data acquisition, feature extraction and intelligent recognition is constructed.

A set of panels including a locking device for locking a first edge portion of a first panel to a second edge portion of a second panel. The locking device includes a horizontal locking device and a vertical locking device. The vertical locking device includes a separate tongue arranged in an insertion groove of the first edge portion and a tongue groove provided in the second edge portion. In a vertically locked state of the first and second edge portions, an abutment member provided at a longitudinal end portion of the separate tongue cooperates with a stop surface of the second edge portion, and a locking portion of the separate tongue cooperates with the tongue groove at a locking surface arranged in a wood-based body layer including wood fibres mainly oriented along a first fibre direction.

The invention relates to the technical field of medical instruments, in particular to a multi-layer ultra-light hernia patch which comprises a large-mesh electrostatic spinning tissue ingrowth layer, a mesh woven base material layer and an anti-adhesion layer which are sequentially connected in a stacked mode. Wherein after the large-mesh electrostatic spinning tissue ingrowth layer is implanted into a human body, a cell microenvironment can be better simulated, cell adhesion, differentiation and migration are facilitated, uniform distribution of newborn cells in the fiber direction of an electrospinning membrane is promoted, granulation tissues uniformly ingrow in a defect part, and the electrospinning fiber membrane and the tissues are cooperatively repaired; secondly, the middle layer can provide supporting performance and mechanical performance of the patch in the early stage for the patch, the defects of the electrospinning fiber membrane in the supporting performance and the mechanical performance are overcome, the long-term implantation amount of the patch after later degradation is greatly reduced, and the foreign body sensation is obviously reduced; the anti-adhesion layer also adopts the electrostatic spinning technology, and the anti-adhesion effect is achieved by selecting materials and regulating and controlling the porosity, the aperture and the fiber diameter of the electrospun fiber membrane.

The invention discloses an ultrasonic orthogonal scanning measurement method for mechanical properties of a fiber reinforced composite material. The method comprises the following steps: aiming at a composite material unidirectional plate to be detected, fixing receiving (transmitting) points on the surface of one side of a material, positioning the transmitting (receiving) points on the surface of the other side of the material, performing linear scanning along any two orthogonal directions, and recording transmission quasi longitudinal wave and quasi transverse wave time domain waveform signals which are acquired by combining each pair of transmitting and receiving points and are propagated along different paths; establishing an acoustic model for quantitatively describing the quantitative relationship between the ultrasonic trend and the independent elastic constant, thickness and fiber direction angle of the to-be-tested fiber reinforced resin matrix composite so as to simulate an ultrasonic data acquisition experiment and generate a corresponding simulated ultrasonic data set; and updating the independent elastic constant, the thickness and the fiber direction angle value of the composite material by taking the similarity degree between ultrasonic data sets obtained by experiments and simulation as a target function. According to the invention, multi-parameter high-precision in-situ nondestructive measurement of mechanical properties, thickness and fiber orientation of materials can be synchronously realized.

A process for foam forming webs is described herein. A foamed suspension of fibers is fed into a mixing chamber and then directed through a narrow constriction where the velocity of the foamed suspension of fibers is increased. From the narrow constriction, the foamed suspension of fibers enters a forming chamber which causes the foamed suspension of fibers to rapidly decrease in velocity. In one embodiment, for example, the foamed suspension of fibers undergoes a hydraulic jump resulting in significant fiber reorientation. Through the process, fiber orientation can be controlled. For example, webs can be produced that have comparable fiber orientation in the machine direction in comparison to the cross-machine direction.

The invention relates to the technical field of composite material repair, in particular to a short carbon fiber technology-based composite material rapid repair method, which comprises the following steps of short carbon fiber pretreatment; preparing a resin matrix; preparing spraying slurry; cleaning the damaged area by laser; scanning the unmanned aerial vehicle; layering and synchronous curing; evaluating the quality of the coating; a chopped fiber spraying technology is applied to the aspect of composite material damage repair, repair time is shortened, cost is reduced, interface bonding strength and fiber orientation are optimized, and the problem that the mechanical property recovery rate of the repaired material is low due to the fact that interlayer stripping or fiber orientation mismatching is prone to occurring in a repair area is solved. And the method can be used for rapidly detecting the thickness of the bubble defect, is suitable for efficient, accurate and light-weight repair of the damage of the CFRP, and is particularly suitable for on-site rapid maintenance scenes.

The invention provides a prepreg thickness uniformity analysis method based on deep learning, and the method comprises the steps: obtaining fiber orientation staggering data in a prepreg multi-layer lamination process, collecting a fiber angle distribution image, and generating a first fiber distribution diagram; extracting fiber orientation staggering characteristics from the first fiber distribution diagram, and separating different angle regions to obtain fiber angle distribution; analyzing the non-uniform resin flow condition according to the fiber angle distribution, and generating a resin flow distribution diagram containing the positions of resin extrusion tiny bulges; based on the resin flow distribution diagram, in combination with gradual adjustment data of lamination pressure of multiple layers of prepregs from low to high, simulating the influence of pressure change on the interlayer fitting degree, and generating a first fitting degree distribution diagram fused with resin flow information; based on the defect position and severity distribution map, combining real-time thickness measurement data to predict thickness distribution deviation caused by interaction of tiny protrusions and bubbles, and generating a first thickness distribution map;

The invention provides a continuous fiber reinforced composite material mould pressing numerical simulation method and system, and the method comprises the steps: S1, building a mould pressing simulation parameterized model based on numerical simulation secondary development by using a programming script; s2, based on the established model, creating an interactive plug-in interface by using a dialog box constructor; s3, the simulation parameters are input into the plug-in to run mould pressing simulation, and a mould pressing simulation result is obtained; s4, establishing a performance analysis model and a warping analysis model according to a mould pressing simulation result and an asymmetrical grid mapping method; and S5, setting corresponding boundary conditions according to actual working conditions, and completing structural performance analysis and warping analysis by using the performance analysis model and the warping analysis model. According to the method, the formed fiber orientation and wrinkle information is mapped into the performance analysis model by using the asymmetrical grid mapping, a set of complete analysis process from manufacturing to response is constructed, and the prediction precision is remarkably improved.

The invention relates to the technical field of equipment processing, in particular to a ship board processing equipment control method and system.The method comprises the steps that the fiber rolling direction of a board to be processed is detected, and an initial processing track is generated in combination with a target contour; inputting the initial processing track into a fiber-track coupling model, and outputting a notch quality prediction parameter; and optimizing an initial processing track according to the cut quality prediction parameters, generating a tear-resistant processing track and controlling an execution mechanism to operate. According to the method, on the basis of coupling of material mechanical properties and machining dynamics, the prediction precision and the local response identification capability are remarkably improved, the notch quality defect caused by small-angle cutting, excessive curvature or vibration excitation is effectively avoided, a scientific basis is provided for trajectory optimization, and the method is suitable for large-scale popularization and application. And the stability and the flexible control capability in the machining process are improved, the cleanliness and the structural integrity of a final plate notch are remarkably improved, and the good industrial application value and the good popularization prospect are achieved.

The invention provides a preparation method of a low-interface thermal resistance carbon fiber composite material based on a low magnetic field orientation technology and carbon fiber orientation equipment. The preparation method comprises the following steps: performing surface modification on short carbon fibers by adopting a non-magnetic carbon fiber surface modifier; mixing and dispersing the surface-modified short carbon fiber, liquid silicone rubber and an auxiliary agent to obtain a carbon fiber composite material; calendaring the carbon fiber composite material to a specified thickness, coating the surface of a rotating table with the carbon fiber composite material for rotary orientation, and preliminarily adjusting the distribution of carbon fibers in the carbon fiber composite material; performing orientation arrangement on the carbon fibers in the carbon fiber composite material again by combining a gradient magnetic field lower than 1T with ultrasonic vibration, wherein the vibration direction of the ultrasonic vibration is consistent with the direction of the magnetic field; and carrying out heating curing molding on the oriented carbon fiber composite material to obtain the low-interface thermal resistance carbon fiber composite material. By regulating and controlling fiber arrangement in stages and combining ultrasonic vibration auxiliary dispersion, carbon fiber dominant direction arrangement is effectively achieved, and the magnetic field intensity requirement is lowered.

The invention discloses an evolution and optimization method of an orientation structure of PAN fibers in a thermal stabilization process, and belongs to the technical field of fiber thermal stabilization optimization processes. Aiming at the problem of how to optimize an orientation structure in the stabilization and carbonization process of converting PAN fibers into carbon fibers at present, the method comprises the following steps: setting a temperature rise program in a fiber oxidation process; establishing an integral fitting process of a typical XRD two-dimensional diffraction pattern of the PAN fiber; calculating the grain size, the interplanar spacing, the crystallinity and the orientation degree; testing the influence of different applied tensions on the fiber shrinkage behavior; the temperature, the tension / strain and the oxidation duration are analyzed by adopting an orthogonal experimental design method, and optimal parameters are selected to complete optimization. The orientation evolution process of the PAN fiber, the oxidized fiber and the carbon fiber is provided, the microstructure change rule of the PAN fiber in the whole drafting-heating process is disclosed in real time by adopting the in-situ two-dimensional X-ray diffraction technology, and technical reference is provided for development of the high-performance carbon fiber.

The invention discloses a white matter microstructure calculation system and method based on multi-shell diffusion-weighted imaging, and the system comprises a data collection module which is used for obtaining diffusion-weighted imaging and structural image magnetic resonance scanning of a testee; the first data processing module is used for obtaining individual fiber orientation distribution and generating a public template of group-specific fiber orientation distribution at the same time; the second data processing module is used for co-registering the individual fiber orientation distribution diagrams to a common template and segmenting the fiber orientation distribution to obtain white matter microstructure indexes of a whole brain level; the third data processing module is used for obtaining a white matter microstructure index of each anatomical fiber bundle level; and the fourth data processing module is used for obtaining a whole brain fiber streamline based on probabilistic fiber bundle tracking and spherical deconvolution information filtering, and generating a white matter microstructure index of a network level in combination with a prior brain map. By adopting the technical scheme of the invention, quantitative calculation and analysis of the white matter microstructure change of the brain are realized.

The present invention discloses a bionic gradient spiral structure composite laminate and a design and preparation method, belonging to the technical field of composite materials. The composite laminate of the present invention comprises a plurality of fiber spiral units coaxially stacked along the thickness direction; the fiber spiral units are stacked layer by layer through carbon fiber prepreg, and each laid fiber layer is rotated by the same angle compared with the fiber direction of the previous layer, and finally a cumulative rotation of 180° is a unit cycle; different fiber spiral units have different rotation angles. The present invention adjusts the out-of-plane impact damage characteristics and damage distribution of the composite laminate through the synergistic effect of fiber spiral units with different rotation angles, thereby improving the out-of-plane impact resistance of the composite laminate.

The present invention provides an artificial dura mater and a preparation method thereof, and relates to the technical field of medical repair materials. The artificial dura mater is mainly composed of a degradable repair membrane layer and an anti-seepage protective layer composited on the degradable repair membrane layer, wherein: the degradable repair membrane layer is composited by a plurality of fiber-oriented sheets, and the orientation direction of the oriented fibers in the fiber-oriented sheets is consistent. The oriented fibers with the same orientation direction are conducive to the attachment of cells, have high biocompatibility, and have good repair and regeneration effects; at the same time, the patch composited by fiber-oriented sheets with different orientation directions in the present application has better mechanical strength. In addition, the anti-seepage protective layer can play a good anti-seepage role, and can also prevent fibroblasts, muscles, and vascular tissue cells from growing into the artificial dura mater to cause adhesion. Therefore, the artificial dura mater of the present application has the advantages of high biocompatibility, good mechanical strength, and excellent anti-seepage and adhesion performance.

The present invention relates to the technical field of concrete material monitoring. Disclosed are a method for monitoring fibers inside concrete, a system, a medium, and a product. The method comprises: acquiring concrete to be monitored; using a capacitance sensor to measure a capacitance value of the concrete to be monitored; inputting the capacitance value of the concrete to be monitored into a dielectric constant calculation formula to obtain a dielectric constant of the concrete to be monitored; acquiring a dielectric constant of target concrete and a dielectric constant of fiber-free concrete; and inputting the dielectric constant of the concrete to be monitored, the dielectric constant of the target concrete and the dielectric constant of the fiber-free concrete into a prediction model to obtain a measurement fiber orientation efficiency coefficient of the concrete to be monitored, and using the measurement fiber orientation efficiency coefficient as a monitoring result of the concrete to be monitored. The present invention can achieve accurate, rapid, and quantitative monitoring of fibers inside concrete.

The invention relates to the technical field of meat slitting optimization, in particular to an intelligent mutton slitting path optimization method and system.The method comprises the following steps that three-dimensional grids and muscle fiber data are obtained, geometry and fiber vectors are fused to calculate an optimal cutting vector field, cutting consistency areas are divided through K-means clustering, and then the optimal cutting vector field is obtained; and determining a regional reference attitude to optimize an internal path, and finally connecting each regional path by using spherical linear interpolation to generate a global cutting path. According to the method, a cutting vector field is generated through fusion of a three-dimensional surface grid and a muscle fiber tensor field and weighting of a geometric normal and a fiber direction, a shape and an internal structure are considered in planning, and continuous smooth transition is formed based on direction similarity clustering and attitude transition trajectory spherical interpolation. And direction coordination and movement coherence of global cutting are kept between areas, deviation and posture sudden change are reduced, the operation stability and slitting precision of a cutter are improved, and machining consistency and structural fidelity are enhanced.

The invention belongs to the technical field of composite materials, and particularly relates to a composite wire, a 3D printed piece and a preparation method and application of the 3D printed piece. According to the invention, the short fiber felt and the thermoplastic polymer sheet are adopted, and the composite material with orientation in the fiber plane is successfully prepared through a laminating and hot-pressing compounding technology. And then, a composite wire with the fiber length direction basically the same as the wire length direction is further prepared through a heating, softening and rolling process. In the 3D printing process, the extrusion effect of the spray head and the optimized printing technology are utilized, the fibers are oriented again, and finally a 3D printed piece with the high fiber orientation degree and the excellent mechanical property is obtained. The preparation process of the 3D printed piece not only effectively exerts the original performance of the fiber, but also enables the 3D printed piece to show more excellent mechanical properties. In addition, the preparation process of the composite wire is simple, convenient and efficient, the requirement for equipment is low, and powerful support is provided for meeting application requirements in multiple fields.

A method for producing a composite material part comprising —a step of producing a preform formed of unidirectional continuous fibers oriented in at least one fiber orientation, —a step of applying non-woven filaments to the preform, and —a step of needling the filaments by means of a needling device comprising a plurality of needles, each needle being provided with a notch extending along a notch axis perpendicular to the main longitudinal axis of the needle, or several notches each extending along a notch axis perpendicular to the main longitudinal axis of the needle, the notch axes being parallel to each other, the needles and the preform being arranged so that the notch axes form a non-zero angle with the fiber orientation.

The invention relates to the technical field of composite material printing, and discloses a process method and system for optimizing distribution of reinforced fibers in composite material printing, and the process method comprises the steps of mixing and preparation of reinforced fibers and a matrix material, path planning and fiber distribution design, real-time fiber conveying and mixed output, and laser heating and immediate curing. Online detection, feedback optimization, printing post-processing and quality verification are carried out. According to the invention, the uniform distribution of the fibers and the matrix material improves the interlayer bonding strength, and the bonding strength is improved by 30%-50%; by means of optimized fiber direction arrangement, the part has excellent mechanical performance under multi-directional loads, the breaking strength is improved by 40%, and the fatigue life is prolonged by two times; fiber consumption is reduced in a low-stress area, mechanical requirements are met, material cost is saved, and the cost is reduced by about 20%; and a real-time monitoring and closed-loop feedback mechanism ensures the distribution uniformity of each layer of fibers, so that the quality stability of a printing part is improved.

The invention discloses a composite shell structure topology and fiber angle optimization and equal-interval path generation method. The invention relates to the field of topological optimization and continuous fiber reinforced composite material additive manufacturing, and aims to solve the problem that continuous, equidistant and manufacturable fiber paths are difficult to obtain for a composite shell structure in the prior art. According to the method, based on isogeometric analysis and a Riisner-mindlin shell theory, with flexibility minimization as a target, topology and fiber angle collaborative optimization is carried out on a curved surface shell structure, and a macroscopic topology form and unit fiber orientation are obtained. And extracting an optimized structure boundary and mapping the optimized structure boundary to a parameter space, constructing a grey-scale map through a density field to identify a parameter space boundary, performing fairing by adopting an NURBS curve, and then mapping the optimized structure boundary back to a physical space to form a smooth space boundary. And extracting a structural skeleton in the parameter space and mapping the structural skeleton to a physical space. And based on the smooth boundary and the skeleton, generating a space fiber path meeting the equidistant requirement.

The invention provides a construction method of a fiber concrete fiber bridging numerical analysis model, and belongs to the technical field of fiber concrete. The method comprises the following steps: firstly, establishing a nonlinear slippage constitutive relation of a fiber-matrix interface; secondly, adopting a probability density function to describe anisotropic distribution of a three-dimensional fiber direction angle, simulating randomness of fiber embedding length in combination with logarithmic normal distribution, and introducing a correction factor to quantify interaction between fibers; secondly, mapping a debonding behavior of a microscopic interface to a macroscopic fracture surface through a heterogeneous data transfer protocol to realize seamless coupling of a multi-scale mechanical state; meanwhile, the grid density of the crack tip area is dynamically optimized by combining posterior error estimation and an unstructured hexahedral grid local subdivision technology. By the adoption of the method, the limitation of a traditional model in the aspects of interface behavior characterization, fiber distribution idealized assumption and grid rigid division is effectively solved, and the precision and reliability of fiber bridging effect simulation are remarkably improved.

The invention relates to the technical field of concrete electric pole manufacturing, and discloses a method and system for manufacturing a centrifugal electric pole based on high-performance steel fiber reinforced anti-crack concrete. The method comprises the following steps: collecting raw material performance index data including concrete rheological characteristics, steel fiber distribution and matrix strength data; an electric pole forming multi-scale coupling model is constructed through a material simulation platform; identifying fiber orientation characteristics according to steel fiber distribution data, comparing the fiber orientation characteristics with a fiber distribution-doping demand mapping table, judging whether to adjust a fiber doping strategy or not, and starting a manufacturing parameter decision process if the fiber doping strategy needs to be adjusted; stirring, centrifugal forming and maintenance parameters are extracted from preset rules in combination with performance index data, and details such as the fiber feeding time sequence, the rotating speed and the temperature and humidity gradient are determined; the model is used for simulating the whole manufacturing process, related indexes are output to evaluate the proportion, parameters and quality stability, an instruction optimization process is generated, and the manufacturing scientificity is improved.

The invention discloses a method for establishing a concrete in-situ mesoscopic finite element model based on a CT (Computed Tomography) scanning technology, which is applied to the technical field of mesoscopic simulation of a concrete structure. The method comprises the following steps: firstly, performing XCT scanning on a steel fiber ultra-high performance concrete test piece to obtain a two-dimensional sequence image of an internal structure of the steel fiber ultra-high performance concrete test piece; then, image processing is carried out through Avizo software, and three-dimensional space distribution information of a base body, steel fibers and pores is segmented and extracted; on the basis of the three-dimensional information, a Python program is utilized to generate a finite element mesh, an eight-node hexahedron unit is adopted in a model, and the established model can accurately reflect real mesoscopic characteristics such as fiber orientation, distribution and pore defects.

The invention discloses a straw pre-wetting time judgment method and system, particularly relates to the technical field of agricultural waste treatment intelligent control, and is used for solving the problem of multi-target conflict between existing pre-wetting process parameters and tunnel fermentation energy consumption. The method comprises the following steps: acquiring initial moisture content and bulk density distribution data of straw in real time, identifying spatial distribution of a high-density blocking region and a low-density permeation channel in a stacking layer, and generating an effective length reflecting a moisture permeation path; generating a pre-wetting time reference value based on dynamic weight fusion of the current batch and historical pre-wetting data, and performing collaborative correction in combination with a coupling relationship between equipment idling time and ventilation energy consumption; the pre-wetting time threshold value is dynamically adjusted through a cooperative feedback mechanism of the main fiber direction of the straw stalks and the acoustic impedance characteristics of the stacking layers; finally, a termination instruction is triggered according to the continuous stable state of the surface layer moisture content and the fiber orientation, and precise balance between energy consumption and process efficiency is achieved while the pre-wetting uniformity is improved.

The invention relates to the field of structural reinforcement and new construction, in particular to a grid material oblique arrangement method for improving the shock resistance of a concrete structure. Comprising the following steps: preparing grids; the grids obtained in the step S1 are obliquely arranged on the surface of a concrete matrix; spraying a bonding layer on the upper part of the grid, so that the grid is bonded with the concrete matrix; scraping mortar on the upper part of the bonding layer; the fiber direction of the grid is changed to be approximately consistent with the main tensile stress direction of an earthquake, so that the fiber efficiently transfers force along a main stress trace line, the shear strength and stability of a concrete structure are improved, meanwhile, concrete is sprayed on the upper portion of the grid, a concrete base body and the grid are bonded together, a layer of mortar is further coated on the upper portion of the bonding layer in a blade coating mode, and the structure is compact. And the grid, the bonding layer and the mortar form a composite protective layer of the concrete structure, so that the stability of the concrete structure can be further improved.