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39 results about "Spectral element method" patented technology
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In the numerical solution of partial differential equations, a topic in mathematics, the spectral element method (SEM) is a formulation of the finite element method (FEM) that uses high degree piecewise polynomials as basis functions. The spectral element method was introduced in a 1984 paper by A. T. Patera.
Spectral measurement method based on optical frequency combs
ActiveCN104316186AReduce volumeReduce maintenance difficultyAbsorption/flicker/reflection spectroscopyColor/spectral properties measurementsFourier analysisVIT signals
The invention discloses a spectral measurement method based on optical frequency combs. The measurement method is characterized in that firstly, an annular laser resonant cavity based on a phase modulator is actively modulated by use of a first optical frequency comb controllable in time domain and frequency domain so that the annular laser resonant cavity is converted into a second optical frequency comb having tiny difference in repetition frequency with the first optical frequency comb, and spectrum detection is performed on the two optical frequency combs to obtain an interference signal carrying the information of a sample to be tested, and meanwhile, frequency beating is performed on the two optical frequency combs and continuous frequency stabilized laser, respectively, the difference frequency signal of two obtained beat frequency signals is mixed with the interference signal, and a signal obtained by virtue of detection mixing is taken as a spectral signal for Fourier analysis so as to reduce the optical information of the sample to be tested. The spectral measurement method has the advantages that the error of the spectral detection due to own phase drift of a dual-optical comb system can be eliminated, and therefore, the resolution and the detection accuracy of the spectral measurement can be improved.
Owner:CHONGQING HUAPU INFORMATION TECH CO LTD
Unconditional stability and conditional stability mixed time domain spectral element electromagnetic analyzing method
ActiveCN104951580AFit closelyFast solutionSpecial data processing applicationsTime domainAnalysis method
The invention discloses an unconditional stability and conditional stability mixed time domain spectral element electromagnetic analyzing method. In a traditional time domain spectral element method, for complex models, especially under the condition of containing multiscale problems, the sizes of meshes obtained through hexahedral subdivision are not uniform. In the subsequent time iteration, in order to ensure that an algorithm is stable and not diverging, the time step is set according to the size of the minimum subdivision mesh, and therefore the whole solution process wastes a large amount of time. The invention provides the self-adapting unconditional stability and conditional stability mixed time domain spectral element method. Small meshes and large meshes are automatically found out through the self-adapting method, an ordinary central difference format is used for the large mesh area, and a Newmark-beta difference format is used for the small mesh area, so that the unconditionally stable iteration format is obtained, the whole time step can be very large, and the solution time is greatly shortened.
Owner:NANJING UNIV OF SCI & TECH
Microwave passive circuit electromagnetic heat integral analysis method based on time domain spectrum element method
ActiveCN104050307AGood mannersQuickly obtain temperature distributionSpecial data processing applicationsMaxwell's equationsEngineering
The invention discloses a microwave passive circuit electromagnetic heat integral analysis method based on a spectrum element method. According to the method, firstly, a time domain spectrum element method is adopted for solving maxwell's equations, the instantaneous electric field and magnetic field distribution of a circuit under the effect of high-power pulses is worked out, and the electromagnetic loss at the current moment is obtained. If all of the electromagnetic loss inside a mold is converted into heat energy, the obtained heat energy is substituted into a heat conduction equation, and the temperature distribution conditions of each point at the current moment are obtained. Electricity characteristic parameters of materials at a next moment are obtained by utilizing a relational expression of dielectric parameters along with the temperature change, an electromagnetic field equation is calculated again, and the electromagnetic loss is obtained. The operation is repeatedly cycled in such a way until the preset heating time is completed. Through the electromagnetic heat integral analysis, the distribution condition of the temperature inside the mold along the time change when a filter receives the effect of different pulses can be clearly obtained, the modeling is flexible, the subdivision is convenient, formed matrixes have good sparsity, and the solving efficiency is higher.
Owner:NANJING UNIV OF SCI & TECH
Multi-grid Chebyshev parallel spectral element method with complex medium elastic wave propagation and simulation
ActiveCN103530451AEasy to divideDivide to avoidSpecial data processing applicationsWave equationWave field
The invention discloses a multi-grid Chebyshev parallel spectral element method. The method includes the steps that a, a calculation area is divided into large and regular units; b, main grids and auxiliary grids are defined in the units, and the main grids are Chebyshev collocation points; c, Wave fields in the units are subjected to Chebyshev truncation expansion by the utilization of the main grids, and medium parameters and external forces in the units are subjected to truncation expansion by the utilization of the auxiliary grids; d, wave field, medium parameter and external force truncation expansion formulas are substituted into a wave equation to obtain unit mass matrixes, unit stiffness matrixes and unit external force vectors; e, on the basis of the unit mass matrixes, the unit stiffness matrixes and the unit external force vectors, an elastic wave expansion is solved on the main grids.
Owner:INST OF ACOUSTICS CHINESE ACAD OF SCI
Short gap gas discharge numerical simulation method based on time-domain spectral element method
ActiveCN107729608AIncrease time stepReduced simulation timeDesign optimisation/simulationSpecial data processing applicationsElectron densityDiscretization
The invention discloses a short gap gas discharge numerical simulation method based on a time-domain spectral element method. The method comprises the following steps of establishing a structure modelof short gap gas, and conducting discretization to obtain the structural information of the model; using a GLL basis function based on the spectral element method for discretization, conducting a Galerkin test, and obtaining an expression of a high-order scheme; for a stiffness matrix, eliminating negative elements outside diagonal lines to obtain an expression of a lower-order scheme; conductingsubtraction on the expressions of the high-order and low-order schemes to obtain original back-diffusion flux and prelimit the original back-diffusion flux; calculating correction factors, obtaininglimited back-diffusion flux at last, adding the limited back-diffusion flux to the expression of the lower-order scheme, conducting time discretization in a multi-step backward difference format, using Newton iteration in each time step for solution, obtaining the electron density and ion density of the gas, calculating an electric field, and updating transport parameters. By means of the method,unconditional stability in time can be achieved, the calculation precision is high, and the simulation effect is good.
Owner:NANJING UNIV OF SCI & TECH
Waveguide device microwave gas discharge numerical simulation method
ActiveCN104679920AEffective protectionEffective prenatal designSpecial data processing applicationsElectron densityElectric field
The invention discloses a waveguide device microwave gas discharge numerical simulation method. According to the method, a microwave gas discharge fluid model in a waveguide structure is built, accurate numerical analysis is performed on electron density, electron fluid velocity and average electron energy during gas breakdown, and accordingly, the law of changing of the electric field intensity and the electron density at different observation positions along with the time in the condition of gas discharge of waveguide devices in different geometric profile complicated structures. The modeling of waveguide devices in any complicated structures can be achieved based on the time domain spectral element method; the generated mass matrix is a block diagonal matrix, and an inverse matrix can be obtained directly, so that the calculation time is reduced greatly; meanwhile, by the aid of the numerical simulation method, the breakdown threshold obtained through electric field distribution and electron density inside the waveguide devices through repeated experiments can be prevented, and accordingly, the design period is shortened, the design cost is saved, and the method is quite applicable to effective simulation design and numerical simulation of waveguide devices with discontinuous structures.
Owner:NANJING UNIV OF SCI & TECH
Blasting scheme multi-criteria selection method based on improved genetic algorithm
The invention discloses a blasting scheme multi-criteria selection method based on an improved genetic algorithm. The blasting scheme multi-criteria selection method is characterized in that a TOPSIS method is used as the universal function of GA, and two sets of criteria of overbreak depth and flying-rock distance are synthesized to sort schemes. The method includes: using a fuzzy number intuitionistic fuzzy set expressed by a structural element method to perform fuzzification on blasting scheme parameters according to fuzzy semantic division of good, hesitate and bad; randomly generating 100 kinds of blasting schemes according to actual statistical features, using the TOPSIS method as the universal function of GA, and synthesizing the two sets of criteria of overbreak depth and flying-rock distance to sort the 100 kinds blasting schemes; considering actual association problems, using a neural network to screen schemes, whose BB and FR conform to requirements, in offspring, and performing number complement of eliminated schemes. By the method widely applicable to strip mine blasting scheme selection, the optimal blasting scheme comprehensively considering the overbreak depth and the flying-rock distance can be obtained.
Owner:LIAONING TECHNICAL UNIVERSITY
A contract element method in the field of bad asset operation
PendingCN109933783AImprove securityImprove reliabilityOffice automationSpecial data processing applicationsDependabilityService efficiency
The invention discloses a contract element method in the field of bad asset operation. The method comprises the following steps of 1, summarizing contract elements; 2, preprocessing the data; Step 3,constructing features; 4, model training and testing; And 5, extracting element contents. The method has the advantages that (1) the natural language processing technology and expert experience are fused to realize the understanding of the computer on the contract text, and the automatic contract auditing can be realized, so that the service efficiency is improved, the labor cost is reduced, and the occurrence of related operation risks is reduced; (2) the contract management after contract elements are carried out avoids the risks of loss, damage and the like in the traditional contract management, and the safety and the reliability of contract information are improved. And (3) the contract information is subjected to element management, so that the use efficiency of contract knowledge isimproved, and the development of services and the determination of decisions are facilitated.
Owner:华融融通(北京)科技有限公司
Spectral measurement method based on LED light source
InactiveCN1556380ASolution to short lifeReduce power consumptionSpectrum investigationSpectral responseMeasurement device
Characters of the method are: monochromatic light needed in measurement is obtained by adopting LEDs possessing different centered wavelengths; measuring device includes measuring light intensity and referencing light intensity generated from wide spectrum photosensors having same characteristics of spectral response; at different moment, driving different LEDs obtains values of spectral response corresponding to relevant central wavelength in order to obtain spectrum response curve further. The invention is applicable to measuring situation: inexact requirement on wavelength resolution; not need of measurement in continuous wavelength; characters of object to be measured are not changed or changed slowly, suitable to production in industrialization scale.
Owner:SOUTH CHINA UNIV OF TECH
Electric-heat integrated analysis method for MESFET under action of high-power electromagnetic pulses
ActiveCN106156388AFlexible modelingEasy to divideSpecial data processing applicationsElectrical field strengthCharge carrier mobility
The invention discloses an electric-heat integrated analysis method for a MESFET under the action of high-power electromagnetic pulses. The method comprises the steps that a drifting-diffusing equation set is solved by taking the electronic quasi Fermi potential, the hole quasi Fermi potential and the electric potential as variables and adopting a time domain spectral-element method to solve the instaneous quasi Fermi potential and electric potential of the metal-semiconductor field effect tube (MESFET) under the action of the high-power pulses, and then the electric field intensity and the current density at the moment are obtained; temperature distribution of all positions at the moment can be obtained under the action of a joule heat source by considering the influences of ambient environment temperature and heat convection; the carrier mobility and the generation-recombination rate are updated according to temperature changes, electric field distribution is recalculated, the steps are repeatedly conducted until the drifting-diffusing equation set meets the convergence precision, and electric field distribution and heat distribution at the moment are to-be-solved electric-heat distribution inside the MESFET at the moment. The method is achieved on the basis of a MESFET physical model, and the distribution conditions, changing along with time, of an electric field and the temperature in a device under the action of the high-power electromagnetic pulses can be clearly obtained.
Owner:NANJING UNIV OF SCI & TECH
Lengendre spectral element method elastic wave propagation parallel simulation method based on element-by-element technology
InactiveCN101866381AReduce the amount of calculationSpecial data processing applicationsTime domainElement by element
The invention discloses a Lengendre spectral element method elastic wave propagation parallel simulation method based on an element-by-element technology, which is based on a Lengendre-expanding spectral element method and adopts the element-by-element technology to realize the method for simulating wave propagation in parallel in such a way that a main node controls a plurality of independent computing nodes. The method comprises the following steps: (1) firstly, rewriting an elastic wave propagation equation by adopting the Lengendre spectral element method; carrying out the task allocation of each computing node according to an equilibrium principle after the space of the whole computing area is dispersed; computing an element mass matrix and an element stiffness matrix which are contained by the respective task of each computing node by each computing node, and storing in the storage of each computing node; and (2) then, computing the overall lattice vector of the whole iteration time slot at the main node by adopting a time domain iteration method, and simultaneously, converting the overall matrix and the vector product of the equally distributed task by each parallel computing node by adopting the element-by-element technology into an element matrix and a vector product. The invention also discloses how to apply the element-by-element technology to the Lengendre spectral element method and lays foundation for realizing parallel methods.
Owner:INST OF ACOUSTICS CHINESE ACAD OF SCI
MOSFET electric heating integrated analysis method under high power electromagnetic pulse effect
ActiveCN105699871AQuickly obtain temperature distributionFlexible modelingIndividual semiconductor device testingMOSFETElectrical field strength
The invention discloses an integrated analysis method of MOSFET electrothermal under the action of high-power electromagnetic pulse. This method first uses the time-domain spectral element method to solve the drift-diffusion equations, and obtains the instantaneous carrier concentration and potential distribution of the MOSFET under the action of high-power pulses, and obtains the electric field strength and current density at the current moment. Assuming that the heat source inside the model is only Joule heat source, considering the influence of ambient temperature and thermal convection, the temperature distribution of each point at the current moment is obtained. Electric field parameters such as carrier mobility are updated according to temperature changes. This cycle is repeated until the drift-diffusion equations meet the convergence accuracy, and the electric field distribution and heat distribution at this time are the required electric heat distribution inside the MOSFET at the current moment. This analysis method has extremely important practical significance for researching semiconductor devices such as MOSFET against high power destruction.
Owner:NANJING UNIV OF SCI & TECH
PIN limiter electrothermal integration analysis method under high-power electromagnetic pulse action
ActiveCN105718618AFlexible modelingEasy to divideSpecial data processing applicationsPhysical modelElectromagnetic pulse
The invention discloses an electro-thermal integrated analysis method of a PIN limiter under the action of high-power electromagnetic pulse, and provides the temperature distribution inside the PIN diode in the limiter circuit under the action of the high-power pulse. In this method, the time-domain spectral element method is used to calculate the semiconductor drift-diffusion equations, and the carriers inside the PIN diode are obtained. , distribution and potential distributed. Then, the electric field inside the semiconductor is obtained and current density On the basis of , starting from the heat conduction equation, the internal temperature of the PIN diode is calculated distributed. Finally, the Newton iterative form of the limiter circuit equation is deduced, and coupled with the drift-diffusion equation and heat conduction equation, the physical model is used to calculate the actual voltage across the PIN diode and the temperature distribution inside the PIN diode.
Owner:NANJING UNIV OF SCI & TECH
Liquid crystal filled photonic crystal fiber analysis method based on full-wave mixed spectral element method
InactiveCN110850523AInhibitionFlexible control of the transmission spectrumCladded optical fibreOptical waveguide light guidePhotonic bandgapFull wave
The invention discloses a liquid crystal filled photonic crystal fiber analysis method based on a full-wave mixed spectral element method, and relates to photonic crystal fibers. The method includes selecting a calculation area without repeated calculation according to a solid model, performing mesh generation of limited sub-domains on the calculation area, and dividing each sub-domain unit into aquadrilateral structure; using a mode of combining a full-wave Helmholtz equation and a Gaussian law, constructing a primary function by a Gaussian-Legendre-Lobatto polynomial, and obtaining the energy band characteristic of the complex medium photonic crystal in a full-wave calculation mode of mutually coupling a TM mode and a TE mode, and the method can inhibit the generation of a zero pseudo mode. Different photonic band gaps under different parameters can be obtained by calculating the liquid crystal filled photonic crystal through a full-wave mixed spectral element method, that is, the photonic crystal fiber can flexibly control the transmission spectrum, and the problem that the transmission characteristic of a traditional photonic crystal fiber cannot be changed any more once the photonic crystal fiber is drawn is solved.
Owner:XIAMEN UNIV
Efficient time domain method for analyzing electrothermal characteristics of semiconductor-containing microwave circuit
ActiveCN111859838AImprove computing efficiencyAccurate analysisComputer aided designSpecial data processing applicationsDevice materialHemt circuits
The invention discloses an efficient time domain method for analyzing electrothermal characteristics of a semiconductor-containing microwave circuit. The efficient time domain method comprises the following steps: firstly, solving a linear electromagnetic field structure by utilizing a conformal time domain finite difference method, loading boundary conditions at a field-path connection position in the electromagnetic field structure by calculating a linear field-path coupling matrix equation, and extracting a time domain impact response signal of the linear electromagnetic structure by calculating the linear field-path coupling matrix equation; coupling the extracted time domain impact response signal with a non-linear semiconductor device, and calculating to obtain time domain information at the port position of the non-linear field-path coupling system; and then performing electro-thermal coupling effect analysis on the semiconductor microwave circuit based on the physical model through a time domain spectral element method, and performing coupling solution on the drift diffusion equation set and the heat conduction equation set. By using the efficient time domain method provided by the invention, a more complex microwave circuit can be processed, and the calculation efficiency of the nonlinear microwave circuit is improved.
Owner:NANJING UNIV OF SCI & TECH
Method for monitoring elasticity modulus of composite material based on deep learning
PendingCN114048673AReal-time monitoring elastic modulus technologyHigh precisionDesign optimisation/simulationNeural architecturesData setMechanical engineering
The invention discloses a method for monitoring elasticity modulus of composite materials based on deep learning. According to the method, a deep neural network is utilized to establish a complex relationship between a frequency dispersion curve of a guided wave propagating in composite materials and elasticity modulus of the composite materials, so that accurate testing on elastic constants of the composite materials is realized; and meanwhile, a spectral element method improved semi-analytical finite element method is used for generating a related data set for training a neural network, the method can be applied to industrial facilities, aerospace equipment and the like, and rapid ultrasonic nondestructive testing of elastic properties of the composite materials is achieved.
Owner:SOUTHEAST UNIV
Modeling method of phase shift mask in photolithographic process
ActiveCN101923278AImprove lithography resolutionReduce modeling timeOriginals for photomechanical treatmentSpecial data processing applicationsModel methodElectric field computation
The invention belongs to the field of integrate circuit photolithography, relating to a modeling method for processing phase shift mask in parallel. In the method, the mask is divided into N numbered vertical reticle mask structures along the longitudinal direction on the vertical juncture of the metal and the quartz of the mask to cause the dielectric constant of the adjacent vertical reticle mask structure to have different distributions on the vertical direction. The characteristic function and the characteristic value of the electric field of the characteristic vertical reticle mask structure are calculated with a spectral element method based on non-continuous Galerkin, and serve as the electric component of the vertical reticle mask structure represented by the primary function; in the horizontal direction, Schwartz iteration is adopted to solve the electric field equation and the boundary condition of N numbered vertical reticle mask structures; in each iteration, the electric field calculation task of N numbered vertical reticle mask structures is distributed to a plurality of calculation nodes to be finished in parallel; and the left and right boundary conditions of each vertical reticle mask structure adopt the solution of the adjacent vertical reticle mask structure in the previous step. The invention has the characteristics of high precision and parallel calculation and can handle the modeling of the practical large-scale phase shift mask of any structure.
Owner:FUDAN UNIV
Method for automatically generating hexahedral mesh with boundary layer of reactor fuel assembly
The invention discloses a method for automatically generating a hexahedral mesh with a boundary layer of a reactor fuel assembly, which comprises the following steps of: 1, performing geometric pretreatment, and reserving a thickness space of a boundary layer mesh on the surface of a fuel rod; 2, partitioning the fluid area, namely partitioning the fluid area into a complex geometric area with stirring and mixing wings and a simple geometric area; 3, utilizing a tetrahedral mesh division method to complete mesh division of the complex geometric area with the mixing wings obtained in the step 2; 4, converting the tetrahedral mesh generated in the step 3 into an HEX8 hexahedral mesh; 5, converting the HEX8 hexahedral mesh generated in the step 4 into an HEX20 hexahedral mesh; 6, generating asimple geometric region grid; 7, generating a boundary layer grid near the surface of the fuel rod. The method solves the problems that computational fluid mechanics calculation software based on a spectral element method is difficult to establish a complex geometric model, and a complex geometric hexahedral mesh with a boundary layer cannot be generated.
Owner:XI AN JIAOTONG UNIV
Simulated solar irradiation device and spectral adjustment method thereof
InactiveUS20140140035A1High degree of spectral coincidenceHigh degreePhotovoltaic monitoringPoint-like light sourceTransmittanceIrradiation
In a simulated sunlight irradiation apparatus (100), at least one of at least one optical filter (4) and at least one optical filter (6) is provided so as to be switchable with another optical filter (14 or 16) having a transmittance characteristic that is different from a transmittance characteristic of the at least one of the at least one optical filter (4) and the at least one optical filter (6).
Owner:SHARP KK
Spectral Modeling Method of Yellow River Main Stream Based on Autoencoder and Multilayer Perceptron Network
ActiveCN105913123BGood estimateImprove good performanceNeural learning methodsComputer simulationsModel parametersMultilayer perceptron
The invention discloses a spectral modeling method for main ice of The Yellow River based on automatic coder and a multilayer perceptor network, wherein the method is used for settling a technical problem of low self-adaptability in an existing modeling method. The method is characterized in that many factors such as the absorption coefficient and the scattering coefficient of a water molecule, the absorption coefficient and the scattering coefficient of a slit particle, incident angle of light and upward scattering angle of water layer are comprehensively considered; and utilizing a neural network structure which is formed through connecting the automatic coder with a multilayer perceptor, studying by means of training data, and finally obtaining the spectral model of the main ice of The Yellow River. The automatic coder has characteristics of effective redundancy information elimination and high robustness to the noise, and therefore obtaining of robustness parameter estimation result is facilitated. According to the spectral model for the main ice of The Yellow River, reasons of the main ice are considered; the factors such as water body, split and illumination are comprehensively considered; and the automatic coder and the multilayer perceptor network are used in the model parameter estimating method; particular model parameters can be automatically acquired according to the data; and high expandability and high self-adaptability are realized.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Optical pickup device
InactiveCN102034503AThe effect and even the meaning are clearOptical detectorsRecord information storageOptical pickupDiffraction effect
The invention provides an optical pickup device which has a simple structure and is capable of effectively inhibiting compatibility of stray light. BD light or CD light reflected by BD or CD is imparted to astigmatism by a detection lens (109). Then, in the BD light or the CD light, light beams in four light beam areas disposed at the periphery of a laser optical axis pass through a spectral element (110) and are separated from one another due to the diffraction effect. A detection surface of a photodetector is provided with sensors (P21-P28) for receiving the BD light and sensors (P31-P38) for receiving the CD light. DVD light is divided into three light beams by a diffraction grating (102) and is radiated to DVD. The DVD light reflected by the DVD is received by sensors (P41-P43) in such a manner that the DVD light is not separated by the spectral element (110). A gap G2 between laser elements in a semiconductor laser (101) is set depending on the spacing S1 between sensor patterns.
Owner:SANYO ELECTRIC CO LTD
PIN diode reconfigurable antenna performance evaluation method under action of high power electromagnetic pulse
ActiveCN105808796AAccurate analysisEfficient analysisSpecial data processing applicationsPhysical modelElectromagnetic pulse
The invention discloses a PIN diode reconfigurable antenna performance evaluation method under the action of a high power electromagnetic pulse. A time domain integration method based on marching-on in-time (MOT) is employed to analyze the performance of a reconfigurable antenna loaded with a PIN diode under the action of the high power electromagnetic pulse, a semiconductor physical model analyzed based on a time domain spectral element method is employed to describe the physical properties of the PIN diode, through solving a drift-diffusion equation set, the charge carrier distribution and potential distribution in the PIN diode are obtained. According to the invention, the drift-diffusion equation of the PIN diode is merged into a time domain integration equation based on MOT to form a strict and synchronous field-circuit coupling solution algorithm, a Newton's iteration method is employed in the solving process, and the analysis and calculation on the coupling between the PIN diode and the antenna are more consistent and effective.
Owner:NANJING UNIV OF SCI & TECH
Manifold Mapping Algorithm Based on High and Low Order Time Domain Spectral Element Method
ActiveCN107818201BSimple and fast operationEasy and flexible operationGeometric CADDesign optimisation/simulationTime domainMicrowave
Owner:NANJING UNIV OF SCI & TECH
A Spectrum Design Method of Energy-saving Lighting Source
ActiveCN105160140BGuaranteed absorptionPart that reduces absorptionGenetic modelsSpecial data processing applicationsEnergy efficient lightingSource spectrum
The invention provides a design method of an energy-saving lighting source spectrum and aims at solving the problem of energy waste due to that an invalid spectrum of an existing lighting source is absorbed by an object in the prior art. The design method comprises the following steps: (1) obtaining spectral reflection properties; (2) establishing an optimization goal and a constraint condition; (3) solving a genetic algorithm; and (4) further obtaining a group of spectral data lowest in energy consumption according to a chromosome lowest in fitness obtained in the previous step, wherein the data is the energy-saving lighting source spectrum of an object to be lighted. In the design method, firstly, the spectral reflection properties of the surface of the object to be lighted are obtained, and secondly, the light source spectrum is optimized by use of the genetic algorithm under the condition of ensuring that the chromatic aberration between the designed light source and a white light source is smaller than values within a human eye perceptible range; as a result, the portion, absorbed by the object, of the spectrum is reduced, the utilization rate of the spectrum and the energy utilization rate are increased, and the purposes of saving energy and lighting are achieved. The design method of the energy-saving lighting source spectrum is applicable to lighting such as display lighting and furniture lighting in buildings.
Owner:旅享网络科技(无锡)有限公司
Manifold mapping algorithm based on high-and-low-order time domain spectral element method
ActiveCN107818201ASimple and fast operationEasy and flexible operationDesign optimisation/simulationSpecial data processing applicationsTime domainMicrowave
The invention discloses a manifold mapping algorithm based on a high-and-low-order time domain spectral element method. The algorithm comprises the steps that firstly, an electromagnetic structure geometric model including a plurality of physical variables is established, and variable optimization simulation is quickly conducted through a time domain spectral element method with a first-order vector basis function till a simulated frequency response meets a target frequency response; secondly, according to the optimized variables, simulation is conducted through a time domain spectral elementmethod including a second-order basis function, whether the simulated frequency response meets the target frequency response or not is judged, and if yes, optimization simulation is finished; thirdly,if not, a correction frequency response model including the two simulation frequency responses is constructed, fast variable optimization simulation is carried out again through the time domain spectral element method including the first-order basis function till the correction frequency response meets the target frequency response; the second step is repeated after optimization is finished. Themethod has the advantages of being high in optimization speed, high in calculation precision and the like, and an important value reference can be provided for simulation design of a microwave device.
Owner:NANJING UNIV OF SCI & TECH
Rapid numerical simulation method for element-by-element parallel strong ground motion
PendingCN113221410AImprove Parallel Computing EfficiencySmall amount of calculationDesign optimisation/simulationComplex mathematical operationsParallel algorithmClassical mechanics
The invention discloses a rapid numerical simulation method for element-by-element parallel strong ground motion. The method comprises the following steps: 1) transforming a hexahedron unit into a standard cube unit through isoparametric transformation; 2) averagely distributing hexahedron units obtained by spatial discretization to a plurality of calculation cores for parallel calculation; 3) adopting high-order Lagrange interpolation on each unit to obtain an interpolation polynomial, and directly performing approximation on the spatial differential operator by utilizing interpolation multiple terms to form a unit stiffness matrix; 4) performing product operation of the element stiffness matrix and the solution vector on the calculation core; and 5) realizing communication between the process pairs according to a product operation result in a cache communication mode. In the theoretical framework of the spectral element method, the element-by-element parallel algorithm for directly solving the seismic wave motion equation is developed, the calculation amount of seismic wave numerical simulation is effectively reduced by improving the spatial discrete format of the traditional spectral element method and adopting a more efficient parallel calculation communication mode, the seismic wave parallel calculation efficiency is improved, and high-efficiency and high-precision strong ground movement becomes reality.
Owner:NAT INST OF NATURAL HAZARDS MINISTRY OF EMERGENCY MANAGEMENT OF CHINA
Unconditional Stable and Conditionally Stable Hybrid Time-Domain Spectral Element Electromagnetic Analysis Method
ActiveCN104951580BFit closelyFast solutionSpecial data processing applicationsTime domainEngineering
The invention discloses an unconditional stability and conditional stability mixed time domain spectral element electromagnetic analyzing method. In a traditional time domain spectral element method, for complex models, especially under the condition of containing multiscale problems, the sizes of meshes obtained through hexahedral subdivision are not uniform. In the subsequent time iteration, in order to ensure that an algorithm is stable and not diverging, the time step is set according to the size of the minimum subdivision mesh, and therefore the whole solution process wastes a large amount of time. The invention provides the self-adapting unconditional stability and conditional stability mixed time domain spectral element method. Small meshes and large meshes are automatically found out through the self-adapting method, an ordinary central difference format is used for the large mesh area, and a Newmark-beta difference format is used for the small mesh area, so that the unconditionally stable iteration format is obtained, the whole time step can be very large, and the solution time is greatly shortened.
Owner:NANJING UNIV OF SCI & TECH
Multi-grid Chebyshev Parallel Spectral Element Method for Simulation of Elastic Wave Propagation in Complex Media
ActiveCN103530451BEasy to divideDivide to avoidSpecial data processing applicationsUnit massWave equation
Owner:INST OF ACOUSTICS CHINESE ACAD OF SCI
Numerical Simulation Method of Microwave Gas Discharge in Waveguide Devices
ActiveCN104679920BEffective protectionShorten the design cycleSpecial data processing applicationsElectrical field strengthElectron density
The invention discloses a microwave gas discharge numerical simulation method of a waveguide device. The method establishes a fluid model of a microwave gas discharge in a waveguide structure, and performs accurate numerical simulations of electron density, electron fluid velocity and average electron energy in the process of gas breakdown. Through the analysis, the law of electric field intensity and electron density at different observation points with time can be obtained in the case of gas discharge in complex structure waveguide devices with different geometric shapes. Based on the time-domain spectral element method, the present invention can realize the modeling of waveguide devices with arbitrary complex structures; the generated mass matrix is a block diagonal matrix, and the inverse matrix can be directly obtained, which greatly reduces the calculation time; at the same time, the method of numerical simulation can Avoid repeated experiments to obtain the internal electric field distribution and electron density of waveguide devices, obtain the breakdown threshold, shorten the design cycle, and save design costs. It is very suitable for effective simulation design and numerical simulation of complex waveguide devices with discontinuous structures .
Owner:NANJING UNIV OF SCI & TECH
A Lubricating Oil Metal X-ray Fluorescence Detection and Spectral Preprocessing Method
InactiveCN105758882BFlexible adjustment of gas environmentAccurate measurementMaterial analysis using wave/particle radiationMultiscale decompositionPretreatment method
The invention relates to a fluorescence-detecting and spectrum pre-processing method for lubricating oil metal X-rays. The fluorescence-detecting and spectrum pre-processing method comprises the following steps: primary X-ray excitation and control, lubricating oil metal X-ray fluorescence spectrum detection, environment gas regulation, and detected spectrum pre-processing. According to the fluorescence-detecting and spectrum pre-processing method, the optimal excitation voltage and current are determined according to the critical excitation energy of a detected metal component, so that scattering spectrum influences caused by characteristic spectrum of a target material are the smallest, and the characteristic peak type and the energy spectrum with the best strength can be obtained; the performances of the detected whole spectrum and the characteristic spectrum are changed by designing pulse shaping time, pulse width, pulse signal recording time, a quick threshold value, an energy spectrum correction coefficient and the like, so that the requirements of simultaneously recording a strong characteristic peak and a weak characteristic peak are met; the gas environment of a measuring light path is flexibly regulated according to the measuring requirements, so that the accurate measurement on light metal elements in a low-energy-spectrum area is realized; and by adopting background baseline self-adaptive correction based on multi-scale decomposition is adopted, so that the requirements of directly measuring lubricating oil metal of an aero-engine are met.
Owner:章炜
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