17 results about "Anisotropic elasticity" patented technology

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 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 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 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 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.

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 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.

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.

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.

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.