42 results about "Computational electromagnetics" patented technology

The invention relates to a near-field effect error analysis method and belongs to the field of radio frequency simulation. Conventional work such as three-element array antenna near-field effect error analysis in China is all based on analytic methods, which are simple, but cannot achieve accurate results and be applicable in an unlimited frequency range. Therefore the near-field effect error analysis method aims to meet the requirements on high frequency and high precision in radio frequency simulation. According to practical application, the near-field effect error analysis method starts with three array element of a three-element array, develops a computational electromagnetic numerical method, combines electromagnetic simulation software to simulate the near-field effect of a three-element array antenna simultaneously, an azimuth-angle and pitch-angle near-field effect error correction table, and obtains a correct target recurrence position through near-field effect error correction. The near-field effect error analysis method is simple and easy and meets the requirements on high frequency and high precision in radio frequency simulation.

A method is provided for transforming data from a high-dimensional to low-dimensional design space, and for inspecting the transformed data in such a manner as to permit effective navigation and exploration of the high-dimensional design space. Conveniently, an optimum / conditional value for a prescribed functional representation of the transformed data can be derived by visual inspection of a 2-D image map representation of the transformed data. Significantly, the invention has utility for various aircraft design applications and although this technology has been developed with reference to aircraft aerodynamic design in particular, the design space visualisation and curve-fitting technology developed is general. It should therefore be equally applicable to other disciplines such as cost analysis, structures and computational electromagnetics, in which expensive analysis tools are used to find optima for complicated design problems. It is expected to be particularly useful in multi-disciplinary design and situations where there are multiple optima in the design space.

The invention provides an efficient analyzing method for a superfine line structure object electromagnetic property, and belongs to the field of analyzing of a computational electromagnetic moment method. A section wavelet serves as a primary function in the moment method, fast wavelet transform is used, a sparse matrix can be obtained through calculation, and therefore the defects caused by a dense matrix are overcome, and a effect more accurate and efficient than that of traditional analyzing can be obtained. The method comprises the steps that firstly, an object is placed in an appropriate geometry coordinate system, and an electric field integral equation to which the surface current conforms is listed; secondly, the section wavelet serves as the primary function to carry out expansion on an unknown current; thirdly, geometry mapping is established and is substituted into an original matrix equation; fourthly, the matrix equation is solved; fifthly, the current distribution is obtained through solving, and the scattering problem is dealt with to obtain far field distribution. The method can serve as an efficient and accurate means for studying a wire antenna, and plays a significant role.

The invention discloses an FETD (finite-element time-domain) analog simulation method based on a parallel algorithm and belongs to the field of computational electromagnetics. According to the method, loop iteration solving of an equation is achieved by replacing conventional serial computation by parallel computation based on existing algorithms; in the parallel solving process, a matrix is introduced to convert an equation set in order to overcome dependent relationship of three adjacent moment unknown quantities in a time marching equation, so that paralleling is made feasible. The method enables the problem of low loop iteration solving efficiency of a time marching equation in FETD to be solved at the premise of ensuring computation precision.

The invention relates to a method for realizing truncated boundaries of anisotropic perfectly matched layers under Cartesian coordinate systems. The method is established under a Cartesian coordinatesystem, appearances of anisotropic perfectly matched layers in three-dimensional problems are spheres, and appearances of anisotropic perfectly matched layers in two-dimensional problems are circles,so that the sizes of grids are consistent, instable factors do not occur, residual grids can be truncated, the calculated amount is decreased, the calculation efficiency is improved, and the problem that square anisotropic perfectly matched layers under existing Cartesian coordinate system are low in calculation efficiency and complicated in calculation; and the appearances of the spheres are combined with square grids, so that stability and high efficiency are provided. Through a formula (as shown in the specification), parameters of truncated parameters of spherical anisotropic perfectly matched layers are designed to be used in programs of computational electromagnetics, so that the effect of simulating anechoic chamber wave-absorbing materials in limited calculation areas can be realized.

The invention belongs to the technical field of computational electromagnetics, in particular to an inverse discrete Fourier transform analytical verification method for propagating an electromagneticfield in a waveguide during a waveguide structure simulation calculation process. The invention corrects the error that the amplitude of the electromagnetic wave propagates infinitely in the waveguide when the signal frequency is less than the cutoff frequency by modifying the calculation formula of the waveguide propagation constant in the analytical verification method of the inverse discrete Fourier transform, and provides a complete analytical verification method suitable for describing any frequency range in the waveguide.

The invention provides a radome electromagnetic performance analysis method considering a heat effect. The method mainly comprises the following steps: S1, establishing a radome mechanical calculationelectromagnetism calculation finite element model; s2, adding material attributes to the mechanical finite element model established in the step S1, and applying a temperature load and boundary conditions; s3, solving the static problem, and extracting node displacement; s4, reconstructing a finite element model of deformation under a temperature load based on the node displacement extracted in S3; s5, reconstructing the finite element model deformed in the step S4 based on HyperMesh software to obtain an electromagnetic calculation finite element model; s6, electromagnetic medium parameter setting and antenna modeling of the electromagnetic calculation finite element model established in the S5 are completed, and analysis of the wave-transparent performance of the radome under the temperature load is completed; and S7, electromagnetic medium parameter setting and antenna modeling of the electromagnetic calculation finite element model established in the step S1.2 are completed, and original state radome wave transmission performance analysis is completed.

The invention belongs to the field of computational electromagnetism numerical solution, and provides a numerical method for reducing the order of a three-dimensional microwave tube input and output window model based on function approximation adaptive error analysis. The three-dimensional eigenanalysis of the microwave tube is carried out through the vector finite element method, and the complex The electromagnetic problem is converted into a mathematical large-scale matrix function equation, and a series of reductions are performed on the equation, that is, the Chebyshev function is used to approximate, combined with the error analysis of the eigenvalues, adaptively select the interpolation point, and divide the convergence of the entire frequency band interval, the expanded subspace of the reduced-order model is obtained, and the final S-parameters can be obtained through post-processing, so as to realize the optimization simulation of the full-band adaptation of the microwave tube.

The invention discloses a parallel algorithm-based FETD simulation simulation method, which belongs to the field of computational electromagnetics. Based on the existing algorithm, this method replaces the conventional serial calculation by means of parallel calculation to realize the solution of the equation loop iteratively. In the process of realizing the parallel solution, the dependence between the three adjacent unknowns in the time-advancing equation is overcome by introducing the transformation of the matrix to the equation system, so as to provide the feasibility for realizing parallelism. On the basis of ensuring the calculation accuracy, this method can solve the problem of inefficiency in the cyclic iterative solution of the time-advancing equation in FETD.

The invention belongs to the field of computational electromagnetics and high-performance computing, and is specifically a Leapfrog ADI‑FDTD method based on GPU parallelism. The present invention adopts Yee grid, by applying GPU parallel computing technology to the Leapfrog ADI-FDTD algorithm containing CPML absorption boundary, forming the Leapfrog ADI-FDTD algorithm containing CPML absorption boundary based on GPU parallel acceleration, while maintaining Leapfrog ADI-FDTD algorithm While the FDTD algorithm and CPML absorb the excellent characteristics of the boundary, it greatly improves the calculation efficiency, greatly saves calculation time, reduces the time period and cost of numerical simulation experiments, and meets the high-efficiency requirements of related scientific research or device design.

Methods for increasing the processing speed of computational electromagnetic methods, such as the Method of Moments (MoM), may involve using efficient mapping of algorithms onto a Graphics Processing Unit (GPU) architecture. Various methods may provide speed / complexity improvements to either or both of: (1) direct solution via Lower-Upper (LU) factorization; and (2) iterative methods (e.g., Generalized Minimal Residual (GMRES) method).

A hardware-based acceleration platform for computational electromagnetic algorithms, specifically the finite-difference time-domain (“FDTD”) method, comprises reformulating the FDTD algorithm in order to make it more hardware friendly. This reformulation makes use of split fields at every node in the mesh, and combines total- and scattered-field formulations into a single, hybrid formulation. By precomputing coefficients for the nodes in the mesh, it is possible for a single set of equations to support plane waves, point sources, PML ABCs, and PEC walls. In the method sources are determined by means of a lookup table, rather than through direct hardware computations. All of these modifications enable the hardware designer to much more easily develop an FDTD accelerator.

The invention belongs to the technical field of ocean remote sensing monitoring and specifically a ship and wake mesh model merging and optimization method. The invention relates to computational fluid mechanic and computational electromagnetic technologies. The method comprises the specific steps of (1), determining an overlapping area of the ship model and the wake model through utilization of prior knowledge for ship and wake models; (2), solving intersection points of triangular surface elements of the ship model and the wake model in the overlapping area; (3), carrying out two-dimensional Delaunay partition on a scattered point cloud, thereby obtaining an initial mesh merging model; and (4), eliminating deformed triangular surface elements, thereby optimizing the mesh model. The merging test of a series of complicated models indicates that the algorithm provided by the invention is applied to the fusion of the mesh models of ship and rough sea surface, and ship and wake with different mesh densities and different structures. The algorithm can be operated stably without an additional condition, the number of the mesh units is reduced, and the deformed triangular surface elements are removed completely.

The invention belongs to the technical field of computational electromagnetics, and in particular relates to a discrete Fourier inverse transform analytical verification method for electromagnetic fields propagating in a waveguide during waveguide structure simulation calculation. The present invention corrects the calculation formula of the waveguide propagation constant in the discrete Fourier transform inverse analytical verification method, corrects the error that the amplitude of the electromagnetic wave grows infinitely as it propagates in the waveguide when the signal frequency is less than the cutoff frequency, and provides a method suitable for A complete analytically verified method for describing any frequency range within a waveguide.

An apparatus for designing a structural product includes memory to store computer-readable program code for an integrated development environment to establish a digital thread in a lifecycle of the structural product, and processing circuitry to execute the computer-readable program code. The apparatus is thereby caused to generate a graphical user interface from which the integrated development environment is accessible to cause the apparatus to generate an electromagnetic effects (EME) model of the structural product from authoritative data including a solid model of the structural product, and parameterize the EME model with one or more electrical properties. The apparatus is caused to produce a computational electromagnetics (CEM) model of the structural product from the parameterized EME model, perform a CEM analysis from the CEM model to generate a corresponding solution is generated, and post-process the corresponding solution.

The invention provides a method for analyzing the electromagnetic radiation characteristics of a piezoelectric ceramic material and belongs to the field of computational electromagnetic analysis. According to the method for analyzing the electromagnetic radiation characteristics of the piezoelectric ceramic material, the interaction process between induction elastic waves and electromagnetic waves under the action of microwaves is accurately described by solving coupled Maxwell equations and an elastic wave equation. The method is different from a traditional method that coupled equations are deduced in a partial differential equation mode. By the adoption of the method, an excitation source of elastic waves is taken as electromagnetic force, generated induction elastic waves are taken as an excitation source and influence original electromagnetic waves in turn, the electromagnetic wave portion and the elastic wave portion of an integral equation are deduced based on the Huygens equivalence principle and the extinction theorem, the electromagnetic wave portion and the elastic wave portion are coupled through the excitation source, and the Nystrom method is introduced to solve the coupled integral equations for the first time. The piezoelectric ceramic is a polycrystal having the piezoelectric performance and is an important part of information functional ceramic. The method for analyzing the electromagnetic radiation characteristics of the piezoelectric ceramic material has quite important significance in research and development of a high-performance high-precision piezoelectric ceramic material.