39 results about "Modal method" patented technology

A multi-modal method for application swapping. An embodiment of a method includes, in response to a first key stroke, displaying a plurality of graphical icons corresponding to running applications, in response to a mouse input, selecting one of the graphical icons, and displaying the running application corresponding to the selected icon. The method enables a user to quickly and easily swap between currently running applications using a keyboard and a mouse.

The invention discloses a harmonic modal analysis method for an offshore wind farm. The method comprises the steps of 1) building a system harmonic model according to an offshore wind farm system, namely a connection relationship between each component and a cable; 2) establishing a network admittance matrix of the system according to the system harmonic model, solving a modal impedance frequency spectrum of the system by utilizing a modal method, calculating a participation factor of each node, and determining a real occurrence position of harmonic vibration; 3) assessing the sensitivity of electric parameters of components of the system; and 4) assessing the sensitivity of design parameters of the system. According to the method, an equivalent model is built according to the parameter of each component of the wind farm, the harmonic performance of the system under different topological parameters, cable parameters, transformer parameters and other parameters is studied by applying the modal analysis method, and the topological design and component model selection of the wind farm can be optimized.

The invention discloses a method for measuring the aberration of an imaging system based on a lateral shearing interference structure. A measurement system comprises a light source, a pinhole mask, a shearing grating, a dual-window mask, a photoelectric detector and a computer. During measurement, the imaging system to be measured is arranged between the pinhole mask and the shearing grating. The method comprises the following steps of: (1) acquiring lateral shearing interferograms in directions x and y; (2) acquiring differential wavefronts in the directions x and y; (3) reconstructing the wavefronts by utilizing a modal method, and acquiring an initial value for zonal construction; and (4) reconstructing the wavefronts by utilizing a zonal method, and acquiring the aberration of the imaging system to be measured. The high-spatial resolution lateral shearing measurement of the aberration of the imaging system is realized on the basis of no increase of measurement times, and the measurement accuracy is insensitive to a change in shear, namely a wavefront measurement error is not remarkably increased along with the increase of the shear.

The present invention is directed to a method for combining assessment of different factors of dyssynchrony into a comprehensive, non-invasive toolbox for treating patients with a CRT therapy device. The toolbox provides high spatial resolution, enabling assessment of regional function, as well as enabling derivation of global metrics to improve patient response and selection for CRT therapy. The method allows for quantitative assessment and estimation of mechanical contraction patterns, tissue viability, and venous anatomy from CT scans combined with electrical activation patterns from Body Surface Potential Mapping (BSPM). This multi-modal method is therefore capable of integrating electrical, mechanical, and structural information about cardiac structure and function in order to guide lead placement of CRT therapy devices. The method generates regional electro-mechanical properties overlaid with cardiac venous distribution and scar tissue. The fusion algorithm for combining all of the data suggests cardiac segments and routes for implantation of epicardial pacing leads.

The invention discloses a modal analyzing method for a high-frequency blade based on noncontact vibration measurement and simulating calculation. The modal method can meet modal analysis in the high-frequency range from 1000 Hz to 15000 Hz, and comprises the following steps that firstly, a free mode and vibration mode are calculated by using a finite element calculation method; secondly, accordingto a free mode calculation result, a measurement point is selected, a blade origin frequency response function is measured by using a laser Doppler vibration measurement technology, and the actual inherent frequency of the blade is obtained; thirdly, the elasticity modulus and the Poisson's ratio parameter of a simulation model are corrected, so that the calculation result of the simulation modelis consistent with the actual inherent frequency, work boundary conditions are applied to the corrected simulation model, and the blade mode in a work state is calculated. By means of the method, theprecise modal frequency and vibration mode can be obtained for the high-frequency blade, and a reliable analysis reference is provided for engine blade resonance, fatigue failure and other faults.

The invention discloses a free-floating space manipulator modeling method under the condition of considering a spacial flexible deformation of an arm lever, and belongs to the technical field of modeling of a manipulator. The core of the free-floating space manipulator modeling method comprises: by applying a cantilever beam model and an assumption modal method, establishing a manipulator kinematic model under the condition of considering the spacial flexible deformation of the arm lever; deducing a jacobian matrix of a system under the condition of considering the spacial flexible deformation of the arm lever; simulating a soft contact collision process by a Hertz damping model, establishing a kinetic equation when the tail end of the manipulator is impacted in combinaion of a lagrange equation, and finally, deducing response equations of the system when a joint is in two states: a free state and a completely-controlled state. According to the free-floating space manipulator modeling method disclosed by the invention, the problem about free-floating space manipulator modeling under the condition of considering the spacial flexible deformation of the arm lever is solved; the movement rule of the flexible arm lever in the three-dimensional space can be analyzed; a numerical simulation result shows that in the case of a certain external impact, the flexible arm lever can generate equivalent flexible deformations on a movement plane and a vertical movement plane.

The invention discloses a fast tracking method of an interactive multi-mode generalized label Dobernoulli under interval measurement, Combining the interactive multi-modal method with the fast algorithm, Firstly, in the framework of generalized label Dobernoulli filter, For the target sampling particle prediction phase, combined with the interval measurement generalized likelihood function, the transfer prediction of all particles to different models is realized, and then the model interaction is carried out by calculating the model weight probability, and then the model interaction particlesare updated by GLMB filter update equation. On this basis, combined with the fast implementation method, the prediction and updating are combined, only one truncation process is needed for each iteration, which reduces the computational load of the algorithm, and ultimately solves the problem of maneuvering multi-target detection and tracking.

The embodiment of the invention discloses a robot smooth obstacle avoiding movement scheduling method based on tangent recursion. The method is suitable for a super-redundancy robot. The method includes the following steps of firstly, establishing a spherical obstacle in a task space, forming a recursion tangent for the obstacle to intersect with a safety distance circle so as to obtain obstacle avoiding non-collision route points; secondly, obtaining the position inverse solution of the super-redundancy robot through a ridgeline modal method so as to obtain joint space postures correspondingto the non-collision route points; thirdly, conducting seven times of B spline interpolation on the postures to obtain a robot smooth obstacle avoiding movement route. The obtained robot movement route is smooth, and the speeds, accelerations and jerks of all driving joints of the robot in the movement process are continuous without sudden changes. When the redundancy of the robot is increased, the method has the more remarkable advantage of being small in computation amount.

The invention relates to a method used for identifying an area being weak in voltage stability of a power grid. On the basis of a traditional modal method, the inaccuracy caused by great influences of active power for Jacobian matrix characteristic values of a system at a power grid running limit state is considered, and a full-voltage modal analysis method with the active power being considered is provided. A weak node acquired according to the method when the stability margin is very small or the system operates at critical destabilization is more accurate. In addition, the method not only can determine the weak node, but also can a control branch and a motor which have a main effect on the current destabilization mode, so that key information is provided for compensation site and load shedding location selection; and valuable engineering guidance information for preventing and controlling voltage destabilization and ensuring safe and stable operations of the power grid.

The invention discloses a wind generation set gearbox fault characteristic extraction method based on IVMD-SE, and belongs to the technical field of the wind generation. The method comprises the following steps: respectively collecting original vibration signals of a wind generation set gearbox gear under a normal working status, an abrasion working status and a tooth breaking working status by utilizing a vibration acceleration sensor; optimizing a penalty term parameter a and a decomposition layer number K in the VMD parameter by adopting a PSO algorithm based on the integer planning; performing decomposition on the gear vibration signals under various working statuses by adopting an improved vibration modal method to obtain various modal components of the vibration signals; optimizingIMF components closely related to the original signals by utilizing the related coefficient method, and taking singular entropies of various modal components as wind turbine gearbox fault characteristics; inputting the characteristics into a multi-classification SVM to verify a characteristic extraction effect. The VMD and the singular entropies are combined to extract the wind generation set gearbox gear fault characteristics under the noise interference, the signal characteristics are strengthened, and the characteristic extraction effect is more obvious.

The invention discloses an entirety and part combined identification method of a ballastless track damage. The method comprises the steps of firstly determining a damage region by use of a damage entirety identification method-curvature modal method, then determining the damage depth of the damage region by use of the damage part detection technology-impact echo, and finally, accurately determining the spatial position of the damage, that is, (1) arranging acceleration sensors on a track plate at intervals, acquiring the surface accelerated speed of the track plate in a multi-point excitation and multi-point acquisition mode, and then performing modal analysis to identify a roughly damage region; (2) utilizing the impact echo technology to identify the damage depth after the step (1) is completed, and finally, accurately determining the spatial position of the damage. The method has simplicity in testing operation and has high detection precision.

The invention discloses a complete buckling two-dimensional dynamic simulation method of a submarine pipeline provided with initial defects introduced with a modal method. The method comprises the steps as follows: finite element software ABAQUS is applied according to geometric parameters and physical and mechanical parameters of the submarine pipeline, and a characteristic buckling mode of the submarine pipeline is computed; the finite element software ABAQUS is applied according to geometric parameters and physical mechanics of the submarine pipeline and seabed soil mass, and a model used for dynamic buckling analysis is rebuilt, and the initial defects of the submarine pipeline are introduced; and a complete dynamic buckling process of the submarine pipeline is analyzed with an explicit dynamic method. According to the complete buckling two-dimensional dynamic simulation method, a slender submarine pipeline structure can be effectively simulated; moreover, completely smooth initial defects are introduced, stress concentration is prevented, and simultaneously, a plurality of modes of the submarine pipeline are introduced in an overlapping manner, so that the purpose of simulating the initial defects in the real high-order mode can be achieved; and further, the dynamic change process of the submarine pipeline in the high temperature and the high pressure can be simulated, good astringency is provided for complete buckling computation of the submarine pipeline, and a computation result can reflect the real condition better.

The invention discloses an offshore wind farm resonance inhibiting method based on modal calculation. The method comprises the steps that 1, a system harmonic wave model is established according to a connection relation between an offshore wind farm system, namely, all components and a cable; 2, a network admittance matrix of the system is established according to the system harmonic wave model, the modal impedance frequency spectrum of the system is solved through a modal method, participation factors of all nodes are calculated, and the true generation position of resonance is determined; 3, inhibiting measures for the resonance are designed according to the participation factors. According to the method, the installing position of a filter is determined according to the participation factors, and compared with the traditional method that the filter is only installed at a confluence point, harmonic waves transmitted in a wind field can be better inhibited.

The invention discloses a method for improving terahertz wave generation efficiency and transmissivity. The method comprises the following steps: obtaining an angle of inclination; obtaining a function expression of the amount of inclination according to the angle of inclination and a grating dispersion equation; obtaining the front surface grating ruling density of lithium niobate crystals according to the Littrow incidence condition, a grating equation and the function expression of the amount of inclination; modeling the grating by a modal method to obtain the grooving width and depth according to the relations between the minus one order diffraction efficiency of the grating and the filling factor and grooving depth of the grating; carving grating structures on the planes of incidence of the lithium niobate crystals by a micro-nano machining method in the machining tolerance range according to the front surface grating ruling density and the grooving width and depth; adding micro right-angle pyramid structures on the incidence interfaces of the lithium niobate crystals through micro-nano machining; and ensuring a pumped laser to emit pump light at specific incidence angles on the front surfaces of the lithium niobate crystals and generate terahertz waves on the emergence interfaces, wherein the grating ruling is parallel to the light axes of the lithium niobate crystals. The method has the beneficial effects of simplifying the components and shortening the light paths.

The invention provides a method for cross-modal detection of network water army. The method comprises the following steps: firstly, obtaining web page comment data, preprocessing the comment data to obtain reduced data; then, extracting text features and image features of the reduced data, and converting the extracted text features and image features into text and image feature vectors; finally, the text and image feature vector dataset is used for cross-modal learning, and the network water army information is obtained. The invention combines and converts the text and the picture by using thecross-modal method, endows the picture with the corresponding classified text label through training and machine learning, converts the similarity of the picture comment into the similarity of the text comment, and quickly and accurately detects the water army in the network comment through the algorithm.

The invention discloses an array antenna vibration deformation prediction method based on a main modal method and strain. The method comprises the steps: S1, estimating the vibration mode number through an effective mass method; S2, determining the number of sensors, wherein the number of sensors is equal to the number of vibration modes; S3, uniformly arranging sensors on the array surface of theplanar array antenna; S4, measuring the strain of a sensor arrangement point on the array plane of the planar array antenna under the condition of vibration load; S5, acquiring a strain modal shape and a displacement modal shape of each measuring point of the antenna unit on the planar array antenna array surface; S6, reconstructing the displacement of the antenna unit. The invention further discloses array antenna vibration deformation prediction equipment based on the main modal method and strain. According to the method, the strain measurement theory is utilized, the model characteristicsof the whole planar array antenna array surface are reflected by collecting the vibration deformation information of a few points of the antenna units, the displacement of the antenna units is reconstructed, and the reconstruction precision is improved.

The invention discloses a parameter calculation method for an all-dielectric polarization beam splitting metamaterial device, and the method comprises the steps: determining the period of a grating, and enabling the grating to only have zero-stage diffraction and -1-stage diffraction; obtaining an intrinsic equation of terahertz wave diffraction in the grating area based on a Helmholtz equation; solving the intrinsic equation to obtain the equivalent refractive indexes of the first two Bloch modes propagated in the grating; based on the Mach-Zehnder interferometer principle, obtaining the approximate function relationship between the diffraction efficiency of the two Bloch modes and the grating depth; and giving a duty ratio to obtain the grating depth when the 0-stage or -1-stage diffraction efficiency of the grating reaches the maximum. The invention further discloses an all-dielectric polarization beam splitting metamaterial device. According to the parameter calculation method, a simplified modal method is adopted, the calculation method is simple, and the calculation amount is small. The all-dielectric polarization beam splitting metamaterial device is simple to process, incident terahertz waves of different polarizations can be diffracted to different directions, and high efficiency is achieved.

The invention discloses a parallel high-precision flutter calculation method based on a modal method, and belongs to the field of aviation aeroelasticity. Firstly, flow field mesh generation softwareperforms mesh generation on a flow field domain of an aircraft, fluent software outputs airfoil mesh node coordinates, mesh center point coordinates, surface unit global numbers and accumulated node numbers to a txt file, and structural finite element software outputs structural finite element node coordinates and modal displacement of each order. And then interpolating each order of modal displacement value to each grid node on the surface of the aircraft, reading each order of modal displacement and the txt file, calculating generalized aerodynamic force of the whole wing, solving to obtaineach order of modal generalized displacement and generalized speed, outputting the modal generalized displacement and generalized speed to the txt file, and calculating the real speed and displacementof each grid center point on the surface of the aircraft. And calculating the real displacement of the structure of each time step from the end time step. And monitoring a structural real displacement time curve of a given position, and finding out a high-precision flutter speed. According to the method, the calculation speed is increased, and the calculation cost is saved.

The invention relates to a high-precision dynamic modeling method for a spatial large-scale rigid-flexible coupling system, and belongs to the technical field of spaceflight. The method comprises the following steps: performing continuous displacement modal discretization on an equivalent model comprising an antenna parabolic cylinder reflector structure and a large space truss through a hypothesis modal method, determining generalized coordinates and generalized force, and finally modeling the system based on the Lagrange principle. The core of the modeling method is to provide a high-precision modeling method for the rigid-flexible coupling system based on the Lagrange principle on the basis of comprehensively considering the structure of the truss antenna. The built model comprises the truss equivalent model of the antenna parabolic cylinder structure, the accuracy of the truss type antenna model is improved, and the defects of an existing truss modeling method are overcome.

The invention discloses a testing method and device for the resonant frequency of a large generator housing. At present, a conventional testing method for the resonant frequency of a generator housingmainly is a modal method. Objectively speaking, however, a more accurate and easier testing method is needed since a generator is large in size, complicated in structure or the like and the testing cost is high. The technical scheme adopted by the invention is as follows: the method includes the steps of testing vibration of a generator housing in a condition of the variable speed of a set, drawing a corresponding Bode diagram, obtaining the resonant rotating speed of the generator housing, and calculating the resonant frequency, resonant aversion coefficients and resonant quality factors; and on the basis of the above step, further identifying faults such as bearing unevenness or stripping of a generator through vibration situations of end caps on the two sides of the on-site generator and supports on the two sides of the on-site generator, and thus providing reference for fault diagnosis of strong vibration of the generator housing. The testing method is easy and practical and has good economic benefits.

The invention discloses a flexible baseline dynamic prediction method based on a fiber grating sensor and a wing mode. According to the invention, the method comprises: employing a modal superpositionprinciple based on structural strain response to calculate structural displacement and a base line variable between child nodes, and then predicting a base line quantity change condition at a futuremoment by a base line dynamic model established based on flexible base line real-time data; employing the modal method to reduce the calculation amount and employing dynamic modeling to predict the flexible baseline in advance so as to solve the problem of real-time transfer alignment time delay caused by time consumption of resolving from the actual measurement dependent variable to the base linevariable, thereby facilitating the realization of high-precision pose real-time transfer alignment of child nodes. The method can be used for remarkably improving the real-time performance of transfer alignment and making up for the defects of previous baseline solution and estimation method research.

A multi-modal system to improve human memory using a video game comprises a multi-modal criteria having a task object for the video game and stimulus sets. There is also provided a multi-modal method to improve human memory using a video game by providing a video game comprising multi-modal criteria, having a task object for the video game, and having stimulus sets.

An indication of a first starting location and a first destination is received from a first user device operated by a first user, and an indication of a second starting location and a second destination is received from a second user device operated by a second user. A multi-modal route from the first starting location to the first destination is generated in view of the second user travelling from the second starting location to the second destination. Generating the multi-modal route includes generating (i) a ride share segment of the multimodal route which the first user and the second usercan traverse together using a ride share service and (ii) a segment of the route associated with a mode of transport other than the ride share service. An indication of the multi-modal route from thefirst starting location to the first destination is provided to the first user device.