15 results about "Mode coupling" patented technology

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.

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.

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).

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.