32results about How to "Guaranteed modeling accuracy" patented technology

The invention discloses a method for fast constructing a high-accuracy personalized face model on the basis of facial images, which belongs to the cross field of computer vision and computer graphics, and aims at achieving the purposes of fast reconstructing a personalized 3D geometrical facial model and a high-accuracy 2D facial texture mapping on the basis of real facial images. The method comprises the following steps: firstly, shooting five facial images from multiple angles; secondly, marking positions and corresponding relationships of forty-one characteristic points on the facial images and a neutral facial model; thirdly, aligning the projection of the neutral facial model on a virtual camera focal plane with the facial images; fourthly, carrying out hierarchical geometrical deformation on the neutral facial model to obtain the personalized geometrical facial model; and finally, synthesizing the high-accuracy facial texture mapping according to the five facial images. The face modeling method has the advantages of convenience for data acquisition, high modeling speed and modeling accuracy, and the like, and achieves higher practical values in the fields of video communication, electronic games, man-machine interaction, and the like.

The invention discloses a modeling method for a noise-uncertainty complicated nonlinear dynamic system. The method includes the steps: 1), collecting data during industrial process to acquire data (XMN, Y); and 2), calculating noise statistical value of known input data and output data by means of Gamma Test to acquire precise information of system noise. The modeling method for the noise-uncertain complicated nonlinear dynamic system has the advantages that the best ideal point for increasing production and saving energy is searched, and optimal value of technological parameters is determined; and practical production guide is performed according to the optimized optimal value of the technological parameters.

The embodiment of the invention provides a three-dimensional geographic scene model construction method and device based on a stereoscopic remote sensing image. The method comprises the following steps: carrying out image preprocessing on an original satellite remote sensing image, and acquiring a digital elevation model image and a digital orthoimage; conducting slicing according to a preset image slicing rule to obtain a digital elevation model image tile and a digital orthoimage tile; establishing a three-dimensional terrain model by using a triangulated irregular network construction technology, and mapping landform texture to the three-dimensional terrain model based on a texture coordinate mapping technology to obtain a partitioned three-dimensional geographic scene model; and finally, storing the partitioned three-dimensional geographic scene model according to tile row and column numbers to obtain a three-dimensional geographic scene model corresponding to the original three-dimensional satellite remote sensing image. Compared with a traditional modeling method, the technical scheme of the invention has the advantages of large modeling scale, high efficiency and high automation degree, and greatly improves the model construction efficiency and the like while ensuring modeling precision and the sense of reality.

The invention belongs to the technical field of micro-positioning platforms. The invention discloses a micro-positioning platform based on piezoelectric ceramic driving and a modeling and control method thereof. The micro-positioning platform comprises a hardware part and a software part, the software part comprises Simulink software loaded in an industrial personal computer, and communication connection between the industrial personal computer and a data collection card is realized based on the software part to form closed-loop deviation control; the modeling method adopts a Hammerstein modelas a modeling basis, and comprises a static nonlinear part and a linear dynamic part: constructing a static nonlinear function based on a Boc-Wen model, and identifying unknown parameters of the model by adopting a particle swarm algorithm; a linear dynamic model is constructed, the model is equivalent to a linear second-order time-invariant system, and a Matlab recognition toolbox is adopted inthe model to obtain parameters; according to the control method, a composite control mode of feedforward control and feedback control is adopted; in conclusion, the high-precision positioning device has a high-precision positioning effect.

A multicolor printing system splitting modeling method for maximizing a color gamut comprises steps of manufacturing and printing single color step-wedges of all primary colors, determining the ultralimit threshold value of each single color ink quantity, measuring the spectrum value of each single-color step-wedge subjected to equal ratio compression and establishing a corresponding relation; splitting an original multicolor printing system into printing system submodels; performing ink color space overall sampling to obtain the sampling samples under the sprinting system submodels, and obtaining the prediction spectrum reflectivity information values by simulation; targeting at all submodels, using a convex hull algorithm to calculate to obtain the ink color space overall sampling color gamut volumes; combining K submodels and using the convex hull algorithm to obtain the color gamut volume of each combination, and locking the combination corresponding to the maximum color gamut coverage rate when the maximum color gamut coverage rate is larger than the preset threshold value, thus realizing the splitting modeling of the original printing system. The method has the technical advantages of obviously reducing the splitting modeling complexity of the system, avoiding the ink quantity ultralimit problem, improving the stability of output colors and the like.

The invention discloses a human-computer interaction virtual-real fusion method and device based on a mixed reality head-mounted display. The method comprises the following steps: acquiring an internal parameter matrix M < internal > and an external parameter matrix M < external > of a camera; and according to the internal parameter matrix and the external parameter matrix, obtaining tracking coordinate system related information {Pori, Roi} of the MR equipment and a pose relationship between the entity camera and a tracking origin, obtaining an external parameter M'of the camera, and according to the internal parameter and the external parameter of the camera, obtaining a fused image. The method solves the problem that in the prior art, in order to achieve interactivity under the two conditions, a virtual human model of which the clothes, the skin color, the skeleton length and the like are similar to those of a testee is generally constructed in a virtual scene by means of a modeling technology, and the virtual human model and the testee move synchronously by means of data driving. Due to the fact that an existing modeling technology cannot well guarantee the modeling precision, a virtual human model has a certain difference with a tester in the aspects of skin color, clothing, skeleton length and the like, and the authenticity of the interaction effect is reduced.

An eddy current testing method of the irregular wear-out defect of a thimble tube by introducing multimedia units comprises steps as follows: firstly, a degenerate magnetic vector potential method discrete control equation is obtained; secondly, the multimedia units containing a substrate and the defect simultaneously is introduced into a unit attribute of the irregular wear-out defect of the thimble tube, the conductivity and the magnetic conductivity attribute in the gauss point position are judged according to the area where the gauss integral point position in the multimedia units is located, and the process of the degenerate magnetic vector potential method discrete control equation is corrected; then, an eddy current detection signal is obtained according to an experiment system; finally, the actual size of the irregular wear-out defect of the thimble tube is obtained according to a conjugate gradient algorithm. After the multimedia units are introduced to the eddy current testing method of the irregular wear-out defect of the thimble tube, the size of the units can be reasonably increased in the premise that the reconstruction accuracy of the eddy current nondestructive detection of the irregular wear-out defect of the thimble tube is guaranteed, so that the total number of the units is notably reduced, the calculation efficiency is effectively improved, and the method has very high practical value.

The invention belongs to the technical field of pneumatic models of turbomachinery, and particularly relates to a modeling method for an aerodynamic model of a turbomachinery blade, which comprises the following steps of: S1, reading a three-dimensional solid model of the blade, including a pressure surface, a suction surface, a front edge and a tail edge; s2, performing grid topology on the pressure surface and the suction surface to obtain two grid surfaces, and generating the pressure surface and the suction surface which do not have complete directivity through node distribution on the grid surfaces; s3, lofting the pressure surface and the suction surface which do not have the complete directivity, and generating the pressure surface and the suction surface which have the directivity; and S4, combining the pressure surface and the suction surface with directivity, and combining the pressure surface and the suction surface with the runner line to generate a geometric entity. According to the modeling method, the distribution of the point set on each blade height section is replaced by the distribution of the grid nodes on the pressure surface and the suction surface, so that the aerodynamic model can be quickly established for the blade, and the modeling precision is high; and the eye fatigue can be effectively relieved without processing a large amount of data.

The invention discloses a CAE automatic modeling method and system for a kinematic pair, a terminal and a storage medium, and belongs to the field of finite element automatic modeling, and the method comprises the steps: obtaining a kinematic pair modeling type and modeling nodes in a kinematic pair modeling request and two to-be-assembled three-dimensional finite element models when the kinematic pair modeling request is received; kinematic pair modeling feature points are determined through the kinematic pair modeling type, the modeling nodes and the two to-be-assembled three-dimensional finite element models; and determining constraint conditions through the kinematic pair modeling feature points, and establishing kinematic pair models of the two three-dimensional finite element models through the constraint conditions and the two to-be-assembled three-dimensional finite element models. While the modeling precision is ensured, the working efficiency is greatly improved, and the product development period is shortened. Firstly, according to the technical scheme, the feature points of the kinematic pair can be accurately solved through an analytical equation, the constraint relation between the feature points and related parts is automatically established, and errors caused by manual operation can be avoided.

The invention discloses a modeling method for a three-dimensional model of a transformer substation, belongs to the field of modeling methods, and discloses a modeling method for a three-dimensional model of a transformer substation. The method comprises the steps of: S00, according to the size of the transformer substation site, establishing a minimum rectangle containing the transformer substation site; S10, performing matrix flight along the minimum rectangle by adopting an unmanned aerial vehicle, and performing high-definition image acquisition on the transformer substation by utilizing oblique photography of the unmanned aerial vehicle; S20, establishing a three-dimensional model through oblique photography modeling software according to the acquired high-definition images; S30, establishing a plane-coordinate system by using the minimum rectangle, determining specific coordinates of each device in the transformer substation in the plane-coordinate system, and correspondingly marking corresponding positions of projections of the three-dimensional model in the minimum rectangle according to the coordinates; and S40, establishing a transformer substation equipment standard model library, replacing the transformer substation equipment with a three-dimensional model in the standard model library by identifying the transformer substation equipment, and carrying out model refinement processing.

The invention discloses a Fortran language-based 3DEC discrete element numerical model modeling method. The method comprises steps of firstly obtaining a three-dimensional contour topographic map of a3DEC discrete element numerical model region, then performing interpolation and rasterization processing on the topographic map to obtain discrete point coordinate data arranged at regular intervals,and then writing and compiling a modeling code based on a Fortran language to obtain a three-dimensional contour map of the 3DEC discrete element numerical model region; rasterizing the discrete point coordinate data to generate a 3DEC discrete element numerical model command stream, and finally reading the model command stream by adopting a 3DEC program to run to generate a 3DEC discrete elementnumerical model. The method is efficient in calculation, simple in operation, high in flexibility, good in convenience and capable of conducting high-precision, multi-rock-stratum and variable-block-unit-size three-dimensional discrete element model construction on a research area with the complex terrain and the large range.

The invention discloses a CAE analogue simulation method for an automobile active air inlet grille, and belongs to the technical field of automobile design, and the CAE analogue simulation method for the automobile active air inlet grille comprises the following steps: determining a CAE analogue simulation analysis working condition of the automobile active air inlet grille; establishing a finite element model of the automobile active air-inlet grille by adopting an unequal thickness modeling method; an automobile active air-inlet grille system is built, and material attributes are established; and S2, carrying out working condition simulation and simulation analysis by using CAE software according to the CAE simulation analysis working condition determined in the step S1. The development cycle of the automobile active air inlet grille can be shortened, and the development cost can be reduced.

The invention provides a method for carrying out rapid modeling by utilizing a depth camera. The method specifically comprises the following steps: S1, obtaining a depth picture by utilizing the depth camera; s2, calculating a transformation pose by utilizing the obtained depth picture; s3, taking the position of the first frame of data as the origin position of the global coordinates, wherein the local coordinates and the global coordinates of the camera in the first frame are superposed; s4, after pose calculation is completed, converting the picture data into point cloud data under global coordinates through pose conversion; s5, calculating a local bounding box of the current shooting range under the local coordinates; s6, dynamically segmenting the bounding box, and updating the TSDF node and all child nodes of the node; and S7, updating, calculating and rendering a triangular patch by utilizing the updated TSDF node and all child nodes of the node, and outputting the triangular patch to a screen. According to the method for carrying out rapid modeling by utilizing the depth camera, the problem that insured products cannot be comprehensively and completely recorded is solved.

The invention discloses a modeling method for a one-dimensional CFD simulation analysis model of an automobile intake and exhaust system, and the method comprises the following steps: S1, building a finite element model of the intake and exhaust system, and the finite element model does not comprise parts irrelevant to gas flow; s2, extracting a pipeline closed surface in the finite element model, performing grid processing on the pipeline closed surface, extracting a shell closed surface in the finite element model, performing grid processing on the shell closed surface, and exporting the pipeline closed surface and the shell closed surface as a geometric model file in an STL format; s3, importing the geometric model files of the pipeline closed surface and the shell closed surface into GT software, and converting the pipeline closed surface and the shell closed surface into a pipeline solid model and a shell solid model by adopting a GEM-3D tool of the GT software; and S4, supplementing parts irrelevant to gas flow into the pipeline and shell solid models, establishing a three-dimensional solid model of the intake and exhaust system, and performing discrete treatment to obtain a one-dimensional CFD simulation analysis model of the intake and exhaust system. The method can ensure the modeling precision and improve the modeling efficiency.

The invention discloses a unified mathematical modeling method for an open-circuit fault of a three-level photovoltaic inverter, and the method comprises the steps: 1, obtaining a mathematical expression of the direct-current side voltage of the three-level photovoltaic inverter according to the characteristics of the fluctuation of the direct-current side voltage when the three-level photovoltaic inverter is in maximum power point tracking operation; and 2, according to different working conditions and current paths of a main circuit power switch device of the three-level photovoltaic inverter, obtaining a switch function expression under a corresponding fault condition, and finally obtaining a unified open-circuit fault switch function expression and a three-level photovoltaic inverter output phase voltage expression. According to the method, a correct three-level photovoltaic inverter open-circuit fault unified mathematical model can be quickly established in a switching function modeling mode, so that the problems that an existing three-level photovoltaic inverter fault simulation circuit modeling method is large in module number, large in calculation amount, poor in simulation flexibility of switching of different types of faults and the like are solved; and the modeling workload and the simulation working time are reduced.