30 results about "Anisotropic elasticity" patented technology

The invention relates to an anisotropic elastic medium Rayleigh surface wave frequency dispersion curve inversion method, which comprises the steps of collecting near-earth surface wave exploration seismic data, obtaining a Rayleigh surface wave frequency dispersion energy diagram based on a phase shift method, and extracting a frequency dispersion curve from the frequency dispersion energy diagram based on a convolutional neural network artificial intelligence method; constructing a near-surface anisotropic elastic parameter initial model; calculating to obtain a theoretical Rayleigh surface wave dispersion curve by using a Rayleigh surface wave dispersion curve forward modeling method according to the current elastic parameter model; designing a loss function according to the observed Rayleigh surface wave dispersion curve and the theoretically calculated Rayleigh surface wave dispersion curve, and calculating and judging whether the loss function reaches a set threshold value or converges to a minimum value; if yes, outputting a current near-surface shear wave velocity model; if the conditions are not met, updating the shear wave velocity model by adopting a quasi-Newton method; and outputting the near-surface shear wave velocity model and the sensitive function of the Rayleigh surface wave frequency dispersion curve to the anisotropic elastic parameter after the loss function meets the condition.

The invention discloses an in-situ three-dimensional full-field transparent visual evaluation method for a rock mass grouting modification effect, and relates to the technical field of geotechnical engineering.The method comprises the steps that S1, in-situ anisotropic sound wave CT data before and after grouting is collected in a target grouting area through a multi-azimuth sound wave ray cluster, and the CT data is obtained; obtaining a high-resolution three-dimensional anisotropic wave velocity field through anisotropic elastic wave inversion and physical constraint neural network super-resolution reconstruction, and automatically identifying a high-value region, a low-value region, a gradient mutation region and a stable region based on a wave velocity variation and a gradient change rate; according to the rock mass grouting modification effect in-situ three-dimensional full-field transparent visualization evaluation method, the scientificity, the fineness and the visualization level of rock mass grouting modification effect evaluation are remarkably improved, and powerful technical support is provided for guaranteeing project quality and optimizing grouting design.

The invention belongs to the technical field of rock physics and geophysics, and discloses a complex fracture anisotropic elastic parameter characterization method and system.The method comprises the steps that an outcrop picture of a fracture-karst geologic body is processed, a complex fracture model is obtained, and the fracture density and the fracture direction of the complex fracture model are calculated; a new Biot consolidation equation is constructed; designing an oscillation relaxation experiment; the complex fracture model is simulated, corresponding boundary conditions are given, and stress and strain fields of the complex fracture model are obtained through calculation; establishing a damage function, and substituting the stress and strain field of the complex crack model to solve the damage function to obtain elastic parameters of the complex crack model corresponding to a single frequency; different frequencies are given to realize calculation of anisotropic elastic parameters of the complex fracture. According to the invention, anisotropic elastic characterization of the complex crack rock can be realized more effectively; according to the method, the restrictive problem of conventional rock physical equivalent modeling and conventional numerical simulation estimation of the elastic parameters is effectively solved.

The invention discloses an ultrasonic shear wave elastography-based intrameniscus tearing quantitative evaluation method and system, and relates to the technical field of computer-aided diagnosis. The method is used for solving the problem of insufficient quantification of meniscus tearing detection. The method comprises the following steps: firstly, fixing a knee joint at a preset buckling angle, exciting shear waves along an annular fiber direction and a vertical direction, and collecting ultrasonic radio-frequency signals of an affected side meniscus and an uninjured side meniscus in different load states; then, a three-dimensional anisotropic elastic atlas is constructed based on the shear wave propagation velocity field, and spatial elastic distribution characteristics of the tissue are obtained; thirdly, calculating an elastic continuity index, a spatial variation coefficient and an abnormal region morphological parameter, and quantitatively representing the continuity and local tearing characteristics of the tissue structure; and finally, inputting the multi-dimensional features into a multi-branch neural network, fusing the features through a cross-branch attention mechanism, and outputting a meniscus tearing quantitative evaluation value, thereby realizing intelligent and objective evaluation of the tearing degree, and providing a basis for clinical diagnosis and postoperative rehabilitation.

The present disclosure provides a shale lamination density prediction method and related equipment based on statistical rock physics, which relates to the field of geophysical exploration technology. The method includes: performing rock physics intersection analysis on the lamination density in the logging data to determine the sensitive elastic parameters of the lamination density; establishing a linear relationship between the lamination density and the sensitive elastic parameters through statistical analysis; substituting the linear relationship into the normalized azimuthal anisotropic elastic impedance equation to establish a statistical rock physics model; substituting the statistical rock physics model into the Bayesian inversion framework, and directly inverting the lamination density using Bayesian to obtain the final inversion result. According to the embodiment of the present disclosure, the lamination density of the shale reservoir can be directly predicted, and the prediction accuracy is significantly improved compared to the indirect prediction of its anisotropic parameters.

The present application relates to a kind of well down distributed fiber (Distributed Acoustic Sensing, DAS) anisotropic shale reservoir guided wave dispersion curve inversion method and medium, comprising: obtaining the guided wave seismic data of shale reservoir, and according to the guided wave seismic data obtained, the guided wave dispersion energy diagram is calculated, and the observed guided wave dispersion curve is extracted from it;Establish the initial anisotropic elastic parameter model of the shale reservoir;According to the initial or updated anisotropic elastic parameter model of the shale reservoir, theoretical guided wave dispersion curve is obtained by forward;Construct objective function, according to the residual between theoretical guided wave dispersion curve and observed guided wave dispersion curve, calculate and judge whether objective function converges;If objective function converges, then output the anisotropic elastic parameter model of current shale reservoir;If objective function does not converge, then anisotropic elastic parameter model is updated using gradient algorithm until objective function converges;Output the optimized shale reservoir anisotropic elastic parameter model.

The application discloses a kind of finite element model construction analysis methods of decompressive craniectomy, specifically related to the field of decompressive craniectomy, comprising: extracting preoperative functional magnetic resonance image and fiber imaging data, establishing functional area atlas containing activation area and fiber direction information;Then according to the consistency of cortical thickness and direction, the anisotropic elastic tensor parameter set of each functional area is constructed, and it is input into the finite element model to establish the joint stress field coupling functional mode response and structural stress.Under the condition of setting multiple bone window configurations, the displacement gradient response of the functional area is simulated and spatially aggregated, and the stability drift sensitive surface is extracted;Finally, based on the response characteristics of the sensitive area, the structural displacement of each decompression scheme is quantitatively evaluated, and the bone window configuration combination that causes the minimum loss of functional stability is output, to provide structural stability support for decompression path planning.

This invention discloses a method and system for determining the acoustic response parameters of anisotropic elastic media, relating to the field of underwater detection. The method includes the following steps: constructing an underwater waveguide structure model comprising water and anisotropic elastic media; constructing the displacement and stress fields of the anisotropic elastic media under multiple vibration modes; constructing equations based on the underwater waveguide structure model, a pre-defined obliquely incident acoustic potential function, and the displacement and stress fields of the anisotropic elastic media under multiple vibration modes; and solving the equations to obtain the transmission and reflection coefficients of the anisotropic elastic media underwater for obliquely incident acoustic waves. This invention provides the response characteristics of anisotropic elastic media underwater for obliquely incident acoustic waves, supplementing the understanding of the performance of anisotropic elastic media in complex environments, and providing theoretical support for the subsequent design of underwater acoustic functional materials and structures.

The application provides an anisotropic multi-source elastic wave parallel forward method based on one-dimensional transverse grouping convolution, belongs to the technical field of geoscience and seismic detection service, and comprises the following steps: 1, anisotropic elastic wave model preparation; 2, multi-source same kind physical quantity storage reorganization; 3, parallel computing operator based on one-dimensional transverse grouping convolution; 4, parallel dispersion suppression filter design; and 5, anisotropic elastic wave forward numerical simulation precision and parallel computing efficiency test. In the multi-shot forward numerical simulation process, the same kind physical quantity matrix is reorganized into a three-dimensional tensor, parallel computing is carried out by combining a one-dimensional transverse grouping convolution operator, then a filter is used for synchronous processing of the wave field of multiple sources at a specific moment, so that the synchronous calculation of the wave field of multiple sources is realized in one sampling time. The method is a parallel scheme which takes into account the calculation efficiency, simulation precision and application cost.

The invention discloses a unidirectional fiber reinforced composite material mechanical behavior prediction method, system, equipment and medium, and relates to the field of fiber reinforced composite material mechanical constitutive research, the method comprises the following steps: preparing fiber composite material test pieces with different ply angles, and carrying out quasi-static compression and shear tests; an anisotropic elastic modulus rotation formula is determined based on a continuous medium mechanics basic equation and mechanical properties of a test piece, a method for solving operator properties in a genetic elasticity theory is adopted to consider a time correlation effect, an explicit operator of genetic elastic modulus is deduced, an action relation of a fractional-exponential function on a Heaviside unit step function is introduced, and the rotation of the anisotropic elastic modulus is determined. And deriving a constitutive equation with a fraction-index operator, further determining a shear constitutive equation under the influence of the strain rate, and predicting a shear stress-strain relationship. The constitutive equation constructed by the method is suitable for all reinforced fiber composite materials, and the shear stress-strain relation of the unidirectional fiber reinforced composite materials can be accurately predicted.

The application provides a corrugated box finite element modeling method for simulating package falling, comprising the following steps: S1: determining equivalent elastic mechanics parameters of corrugated paperboard; S2: verifying whether the equivalent plate anisotropic elastic mechanics parameters are accurate, and if yes, entering S3, otherwise, returning to S1 until the equivalent plate anisotropic elastic mechanics parameters pass the verification; S3: establishing a paper box geometric model, decomposing the paper box into six surfaces of upper, lower, left, right, front and back, modeling each surface by adopting a shell element, and setting topology sharing; S4: respectively giving each surface of the paper box corresponding material properties; S5: dividing the paper box grid model by adopting a quadrilateral, and completing contact setting of the paper box and other PART, setting boundary conditions and load, and solving setting. The method solves the problem that the simulation calculation result of the package falling is not accurate and reliable due to the modeling error of the paper box by combining mechanical test and theoretical formula.

The invention relates to a three-dimensional anisotropic medium seismic wave field simulation method, device and equipment and a medium, and belongs to the technical field of geophysical exploration numerical simulation. Comprising the following steps: introducing a speed attenuation damping term for carrying out seismic wave attenuation in a boundary region on the basis of double factors of time and space into an initial elastic wave equation set which is used for describing seismic wave propagation in a three-dimensional anisotropic medium and is based on an EAL boundary, and obtaining a target anisotropic elastic wave equation set; constructing an expression of a speed attenuation damping item according to the target wave field weighting function; the target wave field weighting function simulates and controls wave field change rates at an inner boundary and an outer boundary corresponding to a wave field absorption boundary based on a Gaussian weighting coefficient; and based on the target anisotropic elastic wave equation set and the expression of the speed attenuation damping term, numerical simulation of the seismic wave propagation process in the three-dimensional anisotropic medium is carried out. Calculation efficiency is considered, calculation resources are saved, and three-dimensional complex earth medium high-precision seismic wave field simulation is achieved.

The present specification relates to the technical field of exploration geophysics, and particularly relates to an anisotropic elastic wave decoupling method and device and computer equipment. The anisotropic elastic wave decoupling method comprises: determining a set of Thomson parameters included in an anisotropic model according to a received wave field decomposition request to be decomposed, the wave field decomposition request to be decomposed comprising a wave field to be decomposed; converting the set of Thomson parameters to obtain an initial set of elastic parameters; performing P-S wave velocity separation processing on the initial set of elastic parameters to obtain a target P-wave elastic parameter set and a target S-wave elastic parameter set; and substituting the target P-wave elastic parameter set and the target S-wave elastic parameter set into the anisotropic model to process the wave field to be decomposed to obtain a target P-wave matrix and a target S-wave matrix. The embodiments of the present specification simplify the P-S wave field decomposition process and reduce the calculation cost.

A display device includes: a display module; a plate attached to the display module; and a digitizer on a lower portion of the plate. The plate is multi-layered, and includes: a layer with an isotropic elasticity coefficient; and a layer with an anisotropic elasticity coefficient.

The invention relates to a parachute canopy dynamics simulation test method and optimization method based on anisotropic springs, and the method comprises the steps: dispersing a parachute canopy into a mass point-spring-damping grid model, dividing the springs into warp springs and weft springs according to the warp and weft directions of a fabric, respectively calibrating the elastic coefficients of the springs through a material test or an empirical formula, and calculating the elastic coefficient of the parachute canopy; an anisotropic elastic force calculation expression is constructed, and a mass-spring-damping model capable of accurately representing the directional characteristics of the fabric is formed; then the model and a computational fluid dynamics model are subjected to bidirectional real-time coupling simulation, the dynamic process of the canopy in a flow field is simulated, and deformation, resistance and flow field data are output. The optimization method comprises the steps of comparing a simulation result with a design index, and adjusting a local design parameter based on a diagnosis result and performing iteration until a requirement is met. According to the method, the prediction accuracy of the nonlinear deformation, aerodynamic performance and fluid-solid coupling effect of the canopy can be remarkably improved, and a reliable tool is provided for efficient digital design optimization.

The present application discloses a method and device for wave field separation of anisotropic elastic medium seismic exploration, which relates to the field of seismic exploration technology. The method includes: obtaining relevant model parameters of anisotropic elastic medium in seismic exploration; converting the seismic wave equation of VTI elastic medium in time domain into the wave number domain, and obtaining the polarization properties of P wave and S wave by solving the Christoffel equation; constructing an anisotropic wave field separation operator according to the polarization property, and approximating it by combining polynomial expansion and optimization strategy to obtain an approximate wave field separation operator; applying the approximate wave field separation operator to the original elastic wave field to obtain decoupled P wave and S wave data; based on the decoupled P wave and S wave data, performing seismic exploration processing and interpretation to obtain exploration results. The present application can effectively balance the accuracy and efficiency of the existing anisotropic elastic medium wave field separation method, and improve the accuracy and efficiency in the development of seismic exploration technology.

The embodiment of the present application discloses a liquid crystal composition and a display panel, the liquid crystal composition comprises at least one first compound represented by a general formula (I), and the present application improves the performance of the liquid crystal composition in the clearing point, optical anisotropy, elastic coefficient and the like by adding the first compound in the liquid crystal composition, so that the display contrast and the response time of the display panel using the liquid crystal composition are improved.

The invention discloses a finite element model construction analysis method for osteoclavicular decompression, and particularly relates to the field of osteoclavicular decompression, which comprises the following steps: extracting preoperative functional magnetic resonance image and fiber imaging data, and establishing a functional area map containing activation area and fiber trend information; then, an anisotropic elastic tensor parameter set of each functional region is constructed according to the thickness and direction consistency of the cortex, the anisotropic elastic tensor parameter set is input into the finite element model, and a combined stress field with coupled functional modal response and structural stress is established; under the condition of setting a plurality of bone window configurations, performing simulation and spatial aggregation on the displacement gradient response of the functional region, and extracting a stability drift sensitive curved surface; and finally, on the basis of response characteristics of the sensitive area, performing structural offset quantitative evaluation on each decompression scheme, outputting a bone window configuration combination causing the minimum functional stability loss, and providing structural stability support for decompression path planning.

A multi-wedge high-efficiency belt and a method for manufacturing a wedge layer material for the high-efficiency belt are disclosed. The multi-wedge high-efficiency belt includes: a backing layer, a wedge material layer disposed on the backing layer, and a rope embedded within the wedge material layer, wherein the coefficient of friction of the high-efficiency belt is greater than or equal to 0.03 N / mm multiplied by the flexural stiffness of the belt with a thickness in the range of 2.6 mm to 4.2 mm. Other characteristics of the high-efficiency belt may include a flexural stiffness in the range of about 30 N / mm to about 65 N / mm and an anisotropic modulus ratio between 1.1 and 5.0. A method for manufacturing the high-efficiency belt is also described, which may include forming a wedge material sheet in a manner that provides parallel-aligned reinforcing fibers. In some embodiments, the sheet forming method provides a sheet wherein the reinforcing fibers are aligned in a direction transverse to the rotational direction of the high-efficiency belt.

Embodiments of the present application relate to a crack prediction method and device, electronic equipment and storage medium, the method comprising: dividing the seismic data into multiple split azimuth seismic data according to azimuth, and stacking according to near, medium and far incidence angles; inverting the stacked seismic data of each split azimuth to obtain isotropic elastic parameters; performing Fourier series expansion on the isotropic elastic parameters to obtain first anisotropic parameters based on an isotropic background; constructing an anisotropic low-frequency model according to the first anisotropic parameters, and inverting each split azimuth seismic data based on the anisotropic low-frequency model to obtain anisotropic elastic parameters; performing Fourier series expansion on the anisotropic elastic parameters to obtain second anisotropic parameters, which are used to realize density and azimuth prediction of target formation cracks; and improving the stability and accuracy of small-scale crack prediction by using near, medium and far path data.

The invention discloses a model construction method for representing a deep hard rock excavation true triaxial stress path, and the method comprises the steps: S1, constructing an excavation stress path coefficient, and quantifying different true triaxial excavation stress paths; s2, introducing an excavation stress path coefficient, correcting the anisotropic elastic stiffness matrix, and constructing an incremental expression of a stress-strain relationship; s3, establishing a three-dimensional yield function; s4-S7, constructing a brittleness index, an internal variable, a strength parameter evolution equation and a deformation parameter evolution equation representing the excavation stress path and the initial stress difference; s8, the formula is embedded into cellular automaton numerical calculation software for calculation; and S9, carrying out true triaxial rock tests of different excavation stress paths and stress differences, and verifying the accuracy of a stress-strain curve. According to the method, the stress-strain characteristics of the rock under the true triaxial excavation stress path are predicted, and a theoretical basis is provided for high-stress deep engineering hard rock excavation damage disaster prediction and stability analysis.

The invention discloses an anisotropic elastic medium seismic exploration wave field separation method and device, and relates to the technical field of seismic exploration. Comprising the following steps: acquiring anisotropic elastic medium related model parameters in seismic exploration; according to a time domain VTI elastic medium seismic wave equation, the time domain VTI elastic medium seismic wave equation is converted into a wave number domain, and P wave and S wave polarization attributes are obtained by solving a Christoffel equation; constructing an anisotropic wave field separation operator according to the polarization attribute, and performing approximate processing on the anisotropic wave field separation operator by combining polynomial expansion and optimization strategies to obtain an approximate wave field separation operator; acting the approximate wave field separation operator on an original elastic wave field to obtain decoupled P wave and S wave data; and performing seismic exploration processing and interpretation based on the decoupled P wave and S wave data to obtain an exploration result. According to the method, the precision and the efficiency in an existing anisotropic elastic medium wave field separation method can be effectively balanced, and the precision and the efficiency are improved in the development of a seismic exploration technology.

This invention discloses a method for modeling orthogonal anisotropic parameters of fractured shale. The method includes: Step S1: collecting well logging datasets; Step S2: calculating the equivalent VTI background stiffness coefficient matrix for fracture-free shale; Step S3: calculating the fracture density based on fast and slow shear wave logging velocities; Step S4: calculating the equivalent orthogonal anisotropic elastic stiffness matrix for fractured shale; Step S5: calculating the anisotropic parameters of the fractured shale to be inverted based on the equivalent orthogonal anisotropic elastic stiffness matrix. This method can conveniently and accurately calculate the elastic stiffness coefficients of the VTI medium, reducing dependence on core measurement data. It has excellent applicability in situations where core analysis data is lacking and the mineral composition and elastic properties of the rock cannot be clearly defined, while also reducing the number of variables in traditional methods.

This specification relates to the field of exploration geophysics, and more particularly to an anisotropic elastic wavefield decomposition method, apparatus, and computer equipment. The anisotropic elastic wavefield decomposition method includes processing the received source wavelet according to an anisotropic model to obtain an anisotropic elastic vector wavefield matrix; determining the scalar P-wave matrix and vector S-wave matrix based on the modified Helmholtz operator and the vector wavefield matrix; and performing anisotropic medium correction and vectorization processing on the scalar P-wave matrix and vector S-wave matrix to obtain the target vector P-wave matrix and target vector S-wave matrix corresponding to the anisotropic elastic wavefield. Using the embodiments in this specification, by processing the anisotropic elastic wavefield with the modified Helmholtz operator, and then performing anisotropic medium correction and vectorization processing, the calculation process is simplified and the computational cost is reduced.

A display device includes: a display module; a plate attached to the display module; and a digitizer on a lower portion of the plate. The plate is multi-layered, and includes: a layer with an isotropic elasticity coefficient; and a layer with an anisotropic elasticity coefficient.

A connection structure (1) includes: a first structure (10); and a second structure (20) that is detachably connected to the first structure (10), the first structure (10) has a first insertion portion, the second structure (20) has a second insertion portion that is detachably fitted to the first insertion portion, at least one of the first insertion portion and the second insertion portion is a periodic structure having an elastic anisotropy that is different in different directions, when a direction in which the first insertion portion and the second insertion portion are fitted to each other is defined as a first direction and a direction orthogonal to the first direction is defined as a second direction, the elasticity in the second direction of the anisotropic elastic structure is greater than the elasticity in the first direction of the anisotropic elastic structure.

A compression sleeve, associated assembly, and method of use for stabilizing orthopedic braces are disclosed herein. The compression sleeve has a generally tubular body adapted to apply compressive forces to an area of a human limb that is flexible in at least two dimensions having an outside surface and an inside surface, wherein the outside surface includes at least one gripping component to assist with keeping an associated orthopedic brace from sliding up / down or rotating around a user's leg / arm. The gripping component may include a micro-channeled surface structure with biomimetic elastomeric ridges, an anisotropic elastomeric lattice, a dual-phase elastomer system, specialized friction-enhanced surface treatments, and / or embedded shape-memory polymer filaments. The invention further includes methods of applying and using a treatment assembly comprising the human limb, optional gauze for absorbing bodily fluids, an optional elastic bandage, the compression sleeve, and an orthopedic brace in a specific sequence to maximize therapeutic outcomes while maintaining brace stability.

The present application discloses a method, system, device, and medium for predicting the mechanical behavior of unidirectional fiber-reinforced composite materials, relating to the field of mechanical constitutive research of fiber-reinforced composite materials. The method comprises: preparing fiber composite specimens with different layup angles and conducting quasi-static compression and shear tests; determining the anisotropic elastic modulus rotation formula based on the basic equations of continuum mechanics and the mechanical properties of the specimens; using the method of solving operator properties in genetic elasticity theory to consider time-related effects, deriving an explicit operator for the genetic elastic modulus, introducing the relationship between the fractional-exponential function and the Heaviside unit step function, deriving a constitutive equation with a fractional-exponential operator, further determining the shear constitutive equation under the influence of strain rate, and predicting the shear stress-strain relationship. The constitutive equation constructed in the present application is applicable to all reinforced fiber composite materials and can accurately predict the shear stress-strain relationship of unidirectional fiber-reinforced composite materials.

This invention discloses an in-situ three-dimensional full-field transparent visualization evaluation method for the effect of rock mass grouting modification, relating to the field of geotechnical engineering technology. The method includes S1: acquiring in-situ anisotropic acoustic CT data before and after grouting in the target grouting area using multi-directional acoustic ray clusters; obtaining a high-resolution three-dimensional anisotropic wave velocity field through anisotropic elastic wave inversion and physical constraint neural network super-resolution reconstruction; and automatically identifying high-value areas, low-value areas, gradient abrupt change areas, and stable areas based on wave velocity change and gradient change rate. This in-situ three-dimensional full-field transparent visualization evaluation method for the effect of rock mass grouting modification significantly improves the scientificity, precision, and visualization level of rock mass grouting modification effect evaluation, providing strong technical support for ensuring engineering quality and optimizing grouting design.