54 results about "Virtual particle" patented technology

A system and method for decentralized cooperative control of a team of agents for geographic and other search tasks. The approach is behavior-based and uses probability particle approach to the search problem. Agents are attracted to probability distributions in the form of virtual particles of probability that represent hypotheses about the existence of objects of interest in a geographic area or a data-space. Reliance on dependable, high-bandwidth communication is reduced by modeling the movements of other team members and the objects of interest between periodic update messages.

A dam bursting flood routing simulation method based on two-dimensional SPH belongs to the technical field of geographic-science course simulation and geographic information systems. By the method, data information of a reservoir and downstream geographic space is obtained firstly, a flood routing two-dimensional mode based on a shallow water equation is established according to the obtained data, and a simulation course undergoes initialization which comprises initial configuration of particle properties, establishment of a neighborhood particle list of particles and setting of parameters; simulation circulation is started then, wherein whether boundary virtual particles are set is determined according to positions of the particles, and the neighborhood particle list of each water particle is updated; force borne by each water particle is calculated, and then the position and the speed of each water particle at the next time step are calculated; and collision detection is carried out, boundary punishment force is applied to change the position and the speed of the particle in case of a boundary, a fluid surface is extracted according to particle distribution, and the extracted fluid surface is rendered. The method provided by the invention can realize the relatively real analogue simulation of the large-scale dam bursting flood routing situations.

The invention provides a method for analyzing and evaluating micro-nano particle dispersion and distribution. The method includes the following steps of firstly, collecting a micro-nano particle microscopic image, and graying the image; secondly, conducting binaryzation on the image through an OTSU method, and removing impure points and ineffective communication domains in the image; thirdly, separating the connected communication domains through the morphological algorithm, and filling holes in the communication domains; fourthly, adding virtual particles, segmenting the image through the watershed algorithm, and obtaining segmented characteristic communication domains; fifthly, calculating related data of the characteristic communication domains; sixthly, evaluating micro-nano particle dispersion and distribution. By means of the method, the more accurate result can be obtained; a large number of micro-nano particle distribution microscopic images can be rapidly processed in a batched mode; the micro-nano particle distribution condition can be analyzed and evaluated comprehensively from the aspects of uniformity, density and clustering degree.

The invention relates to simplified smoothed particle hydrodynamics. For efficient smooth particle hydrodynamics using more particle information, virtual particles are created. Each virtual particle represents an averaging of properties for the fluid particles in a cell. For density, force, or other calculations for a given fluid particle, the interaction between the particles within a cell are calculated. For calculating the influence of particles outside the cell on the particle in the cell, the virtual particles from the neighboring cells are used. The interaction with these aggregate particles reduces the number of calculations while still including the influence from particles of other cells.

The invention provides a method for evaluating the overall roughness of the surface of three-dimensional irregular particles, comprising the following steps: S1, scanning the three-dimensional irregular particles by a three-dimensional scanner to obtain the point cloud data of the surface of the particles; S2, carrying out 3D geometrical reconstruction of the particle surface by using the coordinates of the particle surface points obtained by scanning with the spherical harmonic function with the highest degree n=25, using the reconstructed virtual particles as the reference smooth particles,and evaluating the overall roughness of the particles based on the difference between the real particles and the reference particles; S3, using the reconstructed virtual particles as the reference smooth particles, evaluating the roughness of the real particles based on the volume enclosed between the actual particle surface and the reference particle surface and the reference particle surface area. The invention has the advantages that the whole roughness of the whole particle can be evaluated; The influence of the whole geometry of three-dimensional irregular particles can be considered.

The invention discloses a meshless particle method for analyzing trapped air mass-containing transient pipe flow. The meshless particle method comprises the following steps of (1) initializing relevant variable and particle information; (2) carrying out iterative computation, namely circulating a time variable, circulating particles, calculating pressure information of fluid particles of the initialized particles and updating the pressure information of the fluid particles, the pressure information of upstream virtual particles, speed information of the fluid particles, speeds of upstream and downstream virtual particles, particle positions and corresponding pressure and speed information and the pressure information of downstream virtual particles; and (3) outputting the result. A water hammer equation under a lagrange system is solved by adopting a smoothed particle hydrodynamics method; the influences caused by movement of a gas-liquid interface and weak compressibility of water are fully considered; various errors caused by interpolation and gas-liquid interface tracking technologies are reduced; and the trapped air mass-containing transient pipe flow can be more conveniently simulated on the premise of meeting the numerical precision.

The invention relates to a simulation method of pressure difference in low Reynolds number incompressible flow at bending boundaries. The method comprises the following steps of S1, enabling a calculation module to determine if the formula (1) is met or not for the given low Reynolds number incompressible flow, or R0<<x0, L>>R0, Re<1; S2, if the formula (1) in the step S1 is met, enabling the calculation module to generate or inherit particles in a simulation flow field, and adopting a multi-boundary tangential technology to process the fixed-wall boundary and generating virtual particles according to the requirement of the technology; S3, enabling the calculation module to calculate the volume force FA2 of each particle at the x point of any position according to the formula (2), and calculating the volume force FA1 at an inlet by the formula (3); S4, enabling an output module to output the volume force FA2 at the x point in the step S3. The method can conveniently convert the pressure difference in the low Reynolds number incompressible flow at the bending boundaries into the volume force at any part.

The invention discloses an unmanned aerial vehicle (UAV) formation transformation method based on a virtual structure, applied to the UAV formation and control field for solving the problems that in an existing virtual structure method, each UAV follows a virtual particle, and the virtual structure is limited, so that flexible formation transformation cannot be realized. The UAV formation transformation method based on a virtual structure firstly establishes a UAV formation based on the virtual structure, and then controls the flight state of the entire formation by controlling the flight state of the virtual structure, and the UAV moves around the virtual particle to which the UAV belongs, so as to realize flexible transformation of the UAV formation based on the virtual structure.

The invention relates to a special effect rendering method and device, electronic equipment and a storage medium, and the method comprises the steps of responding to a special effect rendering triggering instruction, and obtaining the initial parameters of virtual particles simulating a target substance, the initial parameters representing the layout information and motion information of the virtual particles in an initial state; determining a target key point of a target object in the target page; and rendering the virtual particles based on the initial parameters to generate a first specialeffect that the target substance flows out of the target key point. By utilizing the embodiment of the invention, real-time online special effect rendering can be realized, the authenticity of the rendered special effect is improved, and the simulation effect is improved.

The invention discloses an acceleration measurement method and device based on a particle image velocimetry technology.The method comprises the steps that trajectory tracking is conducted on virtual particles based on at least three instantaneous velocity fields of a time sequence of an Eulerian coordinate system, and initial trajectories of the virtual particles are obtained; correction is conducted on the initial trajectories of the virtual particles, and corrected trajectories of the virtual particles are obtained, wherein the corrected trajectories at least comprise coordinates corresponding to the virtual particles at all times in the time sequence;the velocity fields corresponding to the virtual particles are determined based on the corrected trajectories, wherein the velocity fields comprise velocity information corresponding to the virtual particles at all the coordinates; on the basis of the velocity fields corresponding to the virtual particles, acceleration fields corresponding to the virtual particles are obtained through calculation, wherein the acceleration fields comprise acceleration information corresponding to the virtual particles at all the coordinates.

The invention relates to the technical field of fluid mechanics, and provides a new method for analyzing a pipeline water hammer, a water hammer equation under a moving coordinate system is solved, and simulation of a water hammer phenomenon in a pipeline is achieved. Meanwhile, the pipeline water hammer problem can be more conveniently simulated on the premise that the numerical precision is met.Therefore, the technical scheme adopted by the invention is as follows: the method comprises the following steps: step 1, initialization: initializing related variables, particles and upstream and downstream virtual particle information; step 2, listing a solving equation and performing iterative computation; and step 3, outputting a result. The method is mainly applied to fluid mechanics engineering design occasions.

The invention discloses a hydraulic transient simulation method based on a Lagrange meshless particle method, which comprises the following steps: establishing a hydraulic transient basic differentialequation, determining a computational domain according to a to-be-simulated water conveyance project instance, collecting initial parameters and determining boundary conditions; arranging calculationparticles in the calculation domain, and arranging virtual particles at the boundary; based on a smooth particle method, performing step-by-step interpolation integration on the function by adoptinga kernel approximation method to obtain a kernel function and a kernel function derivative; adopting a particle approximation method to obtain a particle discrete equation of a kernel function and a particle discrete equation of a kernel function derivative, and further solving a momentum equation and a continuity quality equation; and based on a particle discrete equation of a kernel function derivative, calculating the next time step through an Euler time integral method. Accurate numerical simulation can be performed on hydraulic transient in a water delivery pipeline system, artificial viscosity is introduced to suppress false numerical oscillation, engineering risks can be avoided, and the safety of a hydraulic system is protected.

The invention relates to a method for carrying out porous medium and multiphase fluid mixed simulation by using a virtual particle phase, which comprises the following steps of: calculating absorption phases of solid external fluid and solid internal fluid by using the virtual particle phase, further calculating mass and momentum transmission among different phases, and obtaining discretization implementation based on an SPH method. According to the method, the internal fluid and the external fluid are modeled in a unified mode through the volume fraction and the mixing model, constant particle deletion and insertion are avoided, the real solid fluid mixing simulation effect is achieved, an artistic control scheme is provided, and the porous medium and fluid mixing simulation efficiency and effect are comparable to the effect of a current advanced method in the industry.

The invention discloses an SPH simulation display method and system for a whole submarine landslide catastrophe evolution process. The method comprises the following steps: dispersing a calculation region of a submarine slope body and seawater into a set number of particles with different physical state attributes, and endowing each physical state particle with corresponding physical and mechanical parameters; on an outer side of a boundary, arranging a non-slip boundary layer in which repulsive particles and virtual particles are combined; applying infinite covering seawater gravity and periodic wave action to seawater particles, converting land slope acting force and structural acting force borne by the slope body into stress boundary conditions of a slope body particle calculation area, applying the stress boundary conditions to boundary particles composed of the repulsive particles and the virtual particles, and applying displacement boundary conditions; in each calculation time step, determining a catastrophe evolution stage of the submarine slope body, selecting a system constitutive equation set corresponding to the catastrophe evolution stage, carrying out calculation solving in the single time step, and completing updating of particle physical and mechanical information of a solving domain; and displaying the particle physical and mechanical information at set time steps.

The invention discloses a three-dimensional virtual particle generation method, which comprises the following steps of step S10, obtaining a sectional image of particles, and reconstructing a three-dimensional pixel image corresponding to the particles based on the sectional image; step S20, determining a quality center of the three-dimensional pixel image; step S30, determining a semi-major axisa, a semi-middle axis b and a semi-minor axis c to establish an approximate external ellipsoid corresponding to the three-dimensional pixel image; step S90, calculating the radiuses of the virtual approximate external ellipsoid at different polar angles, and obtaining the radiuses of the virtual particles at different polar angles according to the radiuses of the virtual approximate external ellipsoid at different polar angles and the second compensation radius; and step S100, calculating according to the radiuses of the virtual particles for different polar angles to obtain three-dimensionalrectangular coordinates of surface points of the three-dimensional virtual particles so as to generate the three-dimensional virtual particles. The difference between the generated three-dimensional virtual particles and real particles is small, and the method can be suitable for generation of a large number of particles.

According to one embodiment, a ball mill for working generally spherically shaped target particles into a flake-shaped end product is provided. The ball mill includes a milling tube, one or more milling balls disposed within the milling tube, and a vibration source that is positioned and adapted to move the milling tube such that its central axis follows along a substantially circular path. The continuously changing direction of the acceleration of the milling tube results in each of the milling balls following a respective, substantially orbital path about the milling tube's central axis. As the milling balls follow the respective, orbital paths, the milling balls come into contact with and transform the target particles into flakes. In a further embodiment, the ball mill may further include a virtual particle separator configured to route intermediate particles back to an inlet portion of the milling tube for additional processing time.

The invention discloses a self-adaptive particle fluid computer simulation method for a self-adaptive particle fluid, which comprises the following steps: calculating the distance from each fluid particle to the fluid surface in the whole fluid simulation domain, and calculating the optimal radius of each particle through the distance; according to the optimal radius, performing particle splittingoperation or particle merging operation on all particles in the fluid domain to obtain updated particles; adding a vorticity constraint based on the updated particles, and constructing virtual particles of a range boundary by using a boundary virtual particle adaptive method to perform boundary control of the fluid so as to improve detail simulation; and constructing the latest positions and speeds of all particles in the whole fluid simulation domain. According to the invention, the radius of the fluid particle can be automatically adjusted to adapt to the resolution simulation meeting the requirement, and rich fluid details can still be provided while the fluid simulation efficiency is improved.

In relation to application of artificial intelligence to image analysis of particles, to make it possible to provide data for machine learning corresponding to user demands while making it possible to reduce, as much as possible, man-hours taken to, for example, prepare vast amounts of actual image data obtained by actually capturing images of particles, the present invention generates virtual particle image data, which is image data of a virtual particle, on the basis of a predetermined condition, generates label data corresponding to the virtual particle, and associates the virtual particle image data with the label data.