24 results about "Mode coupling" patented technology

The invention provides an acoustic vortex tunneling transmission method based on topology pairing metasurfaces, and the method comprises the steps: respectively arranging an absorption type metasurface and an emission type metasurface which have opposite topological charges at an inlet and an outlet of a tunneling channel, forming a pair of topology pair TPMs structures, and forming a vortex tunneling system together with a sub-wavelength channel; mode conversion between vortex waves and plane waves is achieved through multi-period fan-shaped grooves etched in the angular direction and the radial direction, and the transmission efficiency is enhanced through Fabry-Perot resonance in a sub-wavelength channel. When the length of the tunneling channel meets specific conditions, periodical adjustment of transmissivity and perfect tunneling can be achieved, and the tunneling structure has high OAM mode coupling and transmission efficiency while guaranteeing the compact structure and low material cost. The metasurface designed by the invention supports diversified acoustic vortex tunneling transmission along a straight line and a curve, and shows excellent flexibility and stability.

The invention relates to a multi-modal oscillation suppression method and system for a network construction type power supply grid-connected system, belongs to the technical field of power system control, and solves the problem that multi-modal oscillation of a large-scale inversion type power supply grid-connected system cannot be cooperatively and rapidly suppressed. The method comprises the following steps: when a system generates broadband oscillation, collecting grid-connected point voltage and current signals of each power station to extract a dominant oscillation mode of each power station; constructing a modal coupling matrix based on the dominant oscillation mode to extract modal coupling strength; identifying a key path of oscillation propagation in the dominant oscillation mode, and extracting a path weight and a power station participation degree; calculating the comprehensive power regulation and control weight of each power generation station in multiple modes so as to determine the power regulation quantity; and distributing the power regulation quantity to an energy storage device, a static var generator (SVG) and each power generation station according to oscillation characteristics of different frequency bands so as to cooperatively suppress multi-modal oscillation. The active / reactive oscillation energy is cooperatively adjusted, so that the oscillation energy of each frequency band is effectively suppressed.

The invention relates to the crossing field of mechanical engineering and intelligent prediction technologies, particularly discloses a coal mill efficiency and service life prediction method and device, and aims to solve the problem that a traditional model is difficult to deal with nonlinear coupling prediction of equipment performance degradation under variable load and coal quality fluctuation. The method comprises the following steps: receiving a multi-source sensing data stream and constructing a structured feature matrix with aligned time sequences; efficiency degradation implicit features are extracted through a nonlinear dynamic encoder, and the interaction influence of grinding roller abrasion, lining plate fatigue and bearing degradation is quantified in combination with a multi-failure-mode coupling analysis module; and cooperatively predicting a network output efficiency attenuation curve and residual life probability distribution through a bidirectional attention mechanism. According to the method, through fusion of multi-source time sequence characteristics and multi-failure coupling modeling, limitation of a static threshold value and linear extrapolation is broken through, prediction precision and timeliness are remarkably improved, intelligent maintenance decision support is provided for a coal-fired power plant, non-planned shutdown risks are reduced, and operation economy and system reliability are optimized.

The invention discloses a spatial gear transmission system reliability evaluation method fusing failure physics and degradation data, and belongs to the technical field of mechanical reliability engineering and fault prediction. The method aims to solve the problem of reliability evaluation of the spatial gear transmission system under the conditions of extreme environment, small sample, multi-failure mode coupling and significant individual difference. The method comprises the following steps: firstly, establishing a gear dynamics model considering nonlinear excitation to obtain dynamic meshing force; then, respectively constructing wear and fatigue degradation models based on failure physics; then, introducing an inverse Gaussian random process considering individual differences to carry out single failure mode reliability modeling; and finally, a Copula function is utilized to construct a binary correlation competition failure model, and system-level reliability comprehensive evaluation is realized. Through the technical route of physical mechanism driving, uncertainty quantification and data statistics fusion, a complete evaluation system is formed, and key technical support is provided for on-orbit health management and life prediction of the space gear transmission system.

The invention discloses a transient power angle stability mode identification method and system based on a relative power angle deviation trajectory, and the method comprises the steps: calculating a relative power angle curve of each unit in a power system relative to the inertia center of the system, and obtaining the relative power angle deviation trajectory of each unit through zero offset correction; determining a grouping moment according to the relative power angle deviation range and variance; carrying out per-unit processing on adjacent gaps in the relative power angle deviation value sorting sequence at the grouping moment, analyzing a significant gap, and dividing a leading group and a lagging group by using the significant gap to obtain a plurality of candidate modes; and determining the candidate mode corresponding to the maximum difference value of inertia center offset trajectories of the preceding group and the lagging group of each candidate mode as the dominant stable mode in a time period from the disturbance initial moment to the grouping moment. The method can be suitable for a complex power system with strong nonlinearity and multi-mode coupling characteristics, can quickly and accurately identify the dominant stability mode, and provides reliable support for transient stability evaluation and active defense control.

The invention belongs to the technical field of bridge vibration reduction, and discloses a TMD parameter design method for modal dense bridge multi-modal vortex vibration control. Modal analysis is carried out on the target bridge, and modal frequency, vibration mode and modal mass where vortex vibration possibly occurs are extracted; then based on a modal shape amplitude threshold, screening significant extreme points of each order of modal, calculating the number of the significant extreme points, and determining the priority of TMD design according to the number from small to large; for a mode with the number of extreme points being 1, the TMD is installed at the unique position; for a mode with the number of extreme points exceeding 1, the TMD mass is split and arranged at symmetrical positions meeting the mode decoupling condition, and therefore mode coupling caused by improper installation positions is avoided. And finally, determining the frequency ratio and the damping ratio of each TMD based on a Den Hartog empirical formula. The method does not need a complex optimization algorithm, is simple in design process, and is suitable for engineering practice; and modal coupling can be effectively inhibited, and the multi-modal vortex vibration control efficiency is improved.

The invention relates to a method for solving dispersion characteristics of a spiral corrugated waveguide in an over-mode state. The method comprises the following steps of: determining an associated mode which can be coupled with a working mode and is coupled with the working mode; quantitatively describing a coupling process between the working mode and the associated mode; constructing a multimode coupling dispersion equation based on the coupling process between the working mode and the associated mode; and carrying out numerical solution on the multimode coupling dispersion equation by adopting an iterative algorithm to obtain a dispersion curve of the helical corrugated waveguide. Based on a coupling wave equation in a vector form, a mode coupling problem under a spiral ripple boundary condition is converted into an eigenvalue problem, a dispersion equation describing multimode coupling generalized is finally derived, numerical solution is carried out on the dispersion equation by adopting a fast convergence algorithm, and therefore a multi-mode coupling model is obtained. And finally, accurate and efficient analysis of the dispersion characteristics of the helical corrugated waveguide in the over-mode state is realized.

A system including a mode coupler has at least one waveguide section connected between a mode coupler input and a mode coupler output. The waveguide section supports a set of guided coupler modes and a set of cutoff coupler modes, and has a transverse refractive index profile and a longitudinal refractive index profile. The transverse refractive index profile is adjusted by free-form optimization to yield a set of desired spacings between a set of propagation constants of the sets of coupler modes such that the longitudinal refractive index profile induces desired couplings between the guided coupler modes, while inhibiting undesired couplings between the guided coupler modes and the cutoff coupler modes, and undesired couplings between the guided coupler modes.

The application belongs to the technical field of photonic link, and particularly relates to a photonic link fast frequency domain calculation method based on multimode coupling and sub-network growth, which comprises the following steps: S1, constructing a multimode scattering model of an optical device; S2, constructing a sub-network multimode scattering matrix; and S3, sub-network merging and optimization. The method is suitable for a photonic network containing any interconnected multi-port elements, can accurately characterize multimode propagation and coupling phenomena by using scattering parameters, can support any number of modes in a waveguide element and mode coupling effects, and can realize efficient calculation of photonic link frequency domain response through step-by-step solution of the multimode scattering matrix.

This application relates to the field of communications, providing a multimode resonator and filter. The multimode resonator has at least two resonance modes: HE mode and HE mode. The multimode resonator includes a resonator housing, a dielectric resonator, and a coupling structure. The dielectric resonator is disposed within the resonator housing and connected to a first wall of the housing. The two electric field polarization directions of the HE mode are along a first radial direction and a second radial direction, respectively, and the first and second radial directions intersect perpendicularly at the central axis of the dielectric resonator. The coupling structure is disposed at one end of the dielectric resonator and intersects perpendicularly at the central axis of the dielectric resonator. The coupling structure is set at an angle to both the first and second radial directions to achieve HE dual-mode coupling. The multimode resonator can achieve HE dual-mode coupling through a simplified and optimized coupling structure, resulting in better coupling performance. This optimizes the structural design, coupling design, and overall performance of the multimode resonator, and facilitates the simulation design of the multimode resonator.

The invention discloses a high-proportion new energy power system transient instability dominant mode identification method and system, and the method comprises the steps: obtaining a power grid dynamic model and an anticipated fault set, and carrying out the time domain transient simulation to generate a power angle and bus voltage curve of a generator; identifying transient power angle instability characteristics or transient voltage instability characteristics and occurrence time in the curve; and identifying the dominant mode of the transient instability according to the time sequence characteristics between the power angle instability moment and the voltage instability moment in combination with a preset causal discrimination logic. According to the method, the identification of transient instability does not simply depend on the size of some static indexes any more, a discrimination method of a transient stability dominant mode is constructed, identification based on time logic is adopted, a source causing system instability can be accurately found out, and the problem of fuzzy identification in a multi-mode coupling scene in the prior art is solved.

The invention discloses a plasma state active control platform and method based on an orbital angular momentum electromagnetic field, and belongs to the technical field of plasma control. The platform comprises an orbital angular momentum electromagnetic field generation module, an energy and mode coupling module, a plasma region, a plasma state sensing module and a feedback control module. All the modules jointly form a closed-loop control structure, and through angular momentum exchange between an orbital angular momentum electromagnetic field and plasmas, active regulation and control over the macroscopic state, spatial distribution or statistical characteristics of the plasmas are achieved. The method does not depend on a specific device structure, a working frequency band or an implementation mode, has the advantages of being high in response speed, high in control dimension, high in adaptability and the like, and is suitable for a magnetic confinement nuclear fusion device, industrial plasma processing equipment and other plasma systems.

This invention provides a method for evaluating the long-term stability of vibration-damping elastomers under multi-mode coupling environments. The method includes sample preparation, test setup, test parameter setting, collaborative detection, damage source tracing, accelerated calculation, and life prediction. Collaborative detection includes macroscopic and microscopic detection; damage source tracing involves determining the contribution ratio of each component; accelerated calculation yields the total acceleration coefficient; and life prediction is based on the acceleration coefficient, providing a scientific basis for formulation optimization, structural design, and engineering applications. The method for evaluating the long-term stability of vibration-damping elastomers under multi-mode coupling environments provided by this invention realistically simulates the synergistic effect of damp heat and dynamic load, achieving rapid and accurate life prediction.

The invention belongs to the technical field of antennas, and discloses a multi-mode array antenna far field calculation method and related equipment, and the method comprises the steps: carrying out the characteristic mode analysis of a multi-mode antenna array element, and obtaining the electric field of each order mode and the characteristic value of each order mode; enabling the mode electric field of each order to be equivalent to a plurality of groups of infinitesimal dipole model parameters, and representing the actual current of the antenna array element based on the plurality of groups of infinitesimal dipole model parameters; using multiple groups of infinitesimal dipole model parameters and actual current to calculate an actual mode electric field of each order, and representing a mode coupling coefficient matrix of the mutual coupling effect of the whole array according to the actual mode electric field of each order; constructing and solving a balance equation of the whole array according to the characteristic value of each order of mode and the mode coupling coefficient matrix, and obtaining an array environment mode excitation coefficient of each order of mode current of the antenna array element under the consideration of the mutual coupling effect; and the radiation field of the whole multimode array antenna is calculated according to the array environment mode excitation coefficient, so that the calculation efficiency is remarkably improved.

Scanning system, including: a MEMS (microelectromechanical system) scanning structure (12) designed to rotate about an axis (13) with a desired rotary motion mode based on at least one drive signal; a plurality of comb drives (40) designed to drive the MEMS scanning structure (12) about the axis (13) according to the desired mode of rotation based on the at least one drive signal, each comb drive (40) comprising a rotor comb electrode and a stator comb electrode forming a capacitive element having a capacitance that depends on the deflection angle of the MEMS scanning structure (12); a driver (25) designed to generate the at least one drive signal; a detection circuit (50) that is selectively coupled to at least one subset of the plurality of comb drives (40) to receive detection signals from them, each detection signal being representative of the capacity of a corresponding comb drive (40); and a processing circuit designed to detect and identify a parasitic motion mode of the MEMS scanning structure (12) based on the sensing signals, wherein the parasitic motion mode does not represent a rotational movement about the axis (13).

The application discloses a metasurface system for realizing electromagnetic shielding and transmission window based on mode coupling, which comprises a first metal layer, a dielectric layer and a second metal layer in sequence along the vertical direction; the first metal layer, the dielectric layer and the second metal layer are square structures with the side length of P and the height of h1, h2 and h3 in sequence along the vertical direction; the first metal layer is provided with a first metal slit extending along the horizontal direction, the first metal slit is arranged in parallel with the first side of the first metal layer and symmetrically relative to the center line of the first side; the second metal layer is provided with a second metal slit extending along the vertical direction, the second metal slit is arranged in parallel with the second side of the second metal layer and symmetrically relative to the center line of the second side; the first side and the second side are arranged perpendicularly, and the relative dielectric constant of the dielectric layer is 3.66.

Systems and techniques are provided that facilitate mode-selective couplers for frequency collision reduction. In various embodiments, a device can include a control qubit. In various aspects, the device can include a first target qubit coupled to the control qubit by a first mode-selective coupler. In various embodiments, the first mode-selective coupler can facilitate A-mode coupling between the control qubit and the first target qubit. In various embodiments, the device can include a second target qubit coupled to the control qubit by a second mode-selective coupler. In various aspects, the second mode-selective coupler can facilitate B-mode coupling between the control qubit and the second target qubit.

The invention discloses a multi-mode coupling industrial park energy management and distribution method and system, and belongs to the technical field of power system operation and control, and the method comprises the steps: collecting the operation state data of the storage, charging and discharging total factors of an internal source network load of an industrial park, and recognizing the type and real-time state of equipment through a non-intrusive load recognition algorithm; inputting a long short-term memory network to predict the photovoltaic power and the total load, outputting the maximum interruptible load capacity through fuzzy reasoning, calculating a power mutual aid reference value by taking the DC bus voltage as a constraint, solving a collaborative optimization model based on a quadratic programming algorithm, and outputting an optimal control vector to drive the adjustable equipment and the flexible interconnection converter. According to the method, the PID control parameters are adaptively adjusted according to the equipment type, the industrial load response lag is compensated, the low-voltage flexible direct-current interconnection system is used for executing power mutual aid, the power unbalance degree of the transformer area is eliminated, the voltage deviation is restrained, and collaborative optimization and accurate distribution of the source network load storage, charging and discharging total factors of the industrial park are achieved.

This invention discloses a four-way filter power divider. The device includes stacked upper and lower metal surfaces and a middle dielectric substrate. The substrate contains a resonant cavity structure surrounded by an array of metallized vias. Its core feature is a centrally symmetrical cross-shaped layout: a square first SIW resonant cavity is located at the center, and four identical rectangular second to fifth SIW resonant cavities are respectively located at the centers of its four sides and coupled to it through coupling windows. The input port is located at one corner of the first resonant cavity, and the four output ports are located on the four rectangular cavities. The central cavity operates at TE... 201 The mold, with four cavities around it, operates at TE. 101 The filter passband is constructed through mode coupling. By using metallized vias of different diameters to construct the cavity boundary and coupling window, a balance between high performance and ease of fabrication is achieved. This invention has advantages such as excellent output amplitude and phase consistency, low insertion loss, compact structure, and ease of integration and mass production.

The application discloses a mode coupling control method and device based on a long-period fiber grating, relates to the field of lasers, and provides the method, which comprises the following steps: preparing a long-period fiber grating, wherein the long-period fiber grating comprises at least one grating area, a preset offset exists between the resonant peak central wavelength of any grating area and the central wavelength of incident laser, and the preset offset makes the initial working transmittance of the grating area be in the maximum slope region of the transmittance spectrum of the grating area; for any grating area, a deformation control device is driven to adjust the curvature radius of the grating area multiple times, the coupling efficiency corresponding to each curvature radius is recorded, and a record data point set is constructed; an actual coupling model is constructed by using the record data point set; and the deformation control device is controlled to adjust the curvature radius of the grating area by using the actual coupling model, so that the actual coupling efficiency of the grating area is consistent with a target coupling efficiency. The application can realize high-precision and continuously adjustable grating mode control, and significantly improves the laser processing quality.

The invention relates to the technical field of signal enhancement, in particular to a single-molecule optical signal enhancement method based on waveguide structure optimization, which specifically comprises the following steps: performing multi-partition groove etching on the surface of a light guide layer, introducing a transverse isolation strip, and collecting a waveguide structure parameter set; dynamically adjusting the depth of the groove and the refractive index difference to obtain an energy concentration parameter; constructing a single molecule anchoring point and a nano confinement hole at the energy peak point of each partition unit to obtain a partition waveguide composite structure; under the irradiation of exciting light, enabling the light energy to excite the single-mode area of the corresponding subarea in an incident angle control and mode coupling mode; enhanced optical signal data is obtained; and carrying out periodic detection on the partitioned waveguide composite structure, calculating a drift coefficient of light intensity of each partition, and carrying out correction processing. The problem that in the prior art, due to the fact that it cannot be ensured that each molecule is independently coupled to an enhanced light field, signal cross interference and data analysis complexity are increased is solved.

The invention discloses a silicon carbide power converter electromagnetic interference modeling method and system, and relates to the field of power electronic electromagnetic compatibility. The method comprises the following steps: selecting key nodes to establish a connection relationship; extracting a switching voltage edge event to obtain starting and ending moments and a voltage change speed; obtaining equivalent common-mode coupling capacitance according to the junction capacitance and the geometric parameters; extracting a backflow path to obtain parasitic inductance, parasitic resistance and ground capacitance, and establishing a backflow network to obtain a dominant resonant frequency; an amplification factor is obtained through backflow network impedance and port impedance, and the injection intensity is generated by combining the voltage change speed and the coupling capacitance; and generating harmonic current according to the injection intensity to obtain a port interference voltage spectrum. Through a unified data link constructed by edge event parameterization, common-mode coupling capacitance equivalence and a backflow parasitic network, traceable and reproducible modeling and prediction of interference voltage spectrum injected from a switch edge to a port are realized.

The invention belongs to the technical field of photonic links, and particularly relates to a photonic link fast frequency domain calculation method based on multimode coupling and sub-network growth, which comprises the following steps: S1, constructing an optical device multimode scattering model; s2, constructing a sub-network multimode scattering matrix; s3, merging and optimizing the sub-networks; the method has the advantages that the method is suitable for the photonic network containing any interconnected multi-port element, scattering parameters are used for accurately representing multimode propagation and coupling phenomena, any number of modes in waveguide elements and the coupling effect between the modes are supported, and efficient calculation of the photonic link frequency domain response is achieved through step-by-step solution of a multimode scattering matrix.

The invention discloses a fluid control equation joint discrete simulation method under multi-physics field coupling, and relates to the technical field of quantum computing simulation, and the method comprises the steps: constructing a unified control equation, constructing a unified control equation based on modal and tensor mapping, and introducing quantum state coding. The method has the advantages that the multi-mode energy momentum tensor is coded into the quantum state, the multi-mode data is processed in parallel by using the quantum superposition characteristic, and compared with traditional serial calculation, the boundary position prediction speed is increased, the prediction accuracy is improved, and the prediction efficiency is improved. A quantum-classical mixed block preprocessing matrix (quantum preprocessing is used for a high-dimensional sub-equation, and classical preprocessing is used for a low-dimensional sub-equation) is constructed based on a modal time scale, and intelligent scheduling (parallel calling of FFT / AMG / GMG at the initial stage of iteration and focusing of a dominant modal at the later stage) is performed through a solver, so that the number of iterations of ill-conditioned equation sets is reduced, and the total calculation time is shortened.