34 results about "Boundary treatment" patented technology

The present invention discloses a boundary processing method and device for adaptive loop filtering. The boundary processing method includes: determining the filtering area according to the upper boundary and the lower boundary of the current largest coding unit of the sequence; and determining the filtering area Whether the pixels outside the left boundary and the right boundary are available, and during the ALF process of the adaptive loop filtering, for the unavailable pixel samples, the pixel samples closest to the pixel samples in the filtering area are used instead. The invention solves the problem of boundary processing in the ALF filter process, fully utilizes the correlation between pixels, and reduces the hardware cost in the process of realizing the adaptive loop filter at the cost of slight coding performance loss.

The invention discloses an implement method and an implement system for three-dimensional fluid-solid one-way coupling. The implement method includes: dispersing triangular meshes at the boundary of a solid into particles, and performing homogenized sampling on boundary particles; calculating state of fluid particles in the solid, wherein the state includes density of the fluid and the fluid particles at the boundary of the solid, pressure and viscous force of the fluid particles, and surface tension of the fluid particles; updating speed and position information of the fluid particles by a numerical integration mode; correcting the speed and the position of the fluid particles when the fluid particles penetrate through the boundary of the solid, and thereby achieving three-dimensional fluid-solid one-way coupling. According to the method and the system provided by the invention, stability during boundary treatment is increased, when pressure and viscous force is successfully simulated and penetrating effect is prevented, computation complexity is greatly reduced, and macroscopic effect of the surface tension is effectively simulated, furthermore, the mesh distorting phenomenon in the case of directly simulating aggregation force does not appear.

The invention relates to an NaI (TI) scintillation detector gamma energy spectrum high-resolution inversion analysis process and method based on a gauss response matrix. The analysis process comprises the steps of spectral line pretreatment, peak searching and peak boundary treatment, resolution ratio ruling, background subtraction, gauss response matrix generation and inversion analysis. According to the feature of an NaI (TI) scintillation detector and the physical property of the spectrum forming process, response, in the detector, of different energy gamma photons corresponds to different full widths at half maximum of a photo peak, and the photo peak is approximate to a gauss function in shape. The parameters of the full widths at half maximum of a spectral line are extracted, the background is subtracted from the full widths at half maximum adaptively, the universal gauss response matrix between a radioactive source and a gamma spectrum is constructed, and finally the response matrix is used for inversion analysis of other gamma instrument spectrums measured by the NaI (TI) scintillation detector. The result analyzed through the method is an energy point corresponding to the measured spectral line under the response matrix or is approximate to the solution of a physical spectral line in theory, and the ability of the method to analyze the spectral line is obviously improved.

The invention belongs to the field of static testing and predicting, and particularly relates to a static testing and predicting method for a shell stiffened structure. Under different load actions and different boundary treatment ways, the static predicting simulation result of the structure is compared with the testing data. Systematic comparison and comprehensive evaluation of correlated errors, which are conducted on static testing and static predicting simulation, are achieved, and the problem that in the past, only extremely specific feature points are subjected to data analysis and comparison is solved; impact factor data of real test or simulation are calculated through contrastive analysis in different grades and accumulation of different boundary simulation ways, different solving ways and different testing methods; and the relation between testing and predicting can be intuitively responded through comparison of cloud charts, curves and similarities, and whether a test is conducted continuously or not, whether a test piece is needed or not and whether human and property are security or not can be determined through evaluation of data.

The invention relates to a method for calculating core permeability by adopting digital core simulation. The method comprises the following steps: a, a physical model of porous core media is simulated with the Lattice Boltzmann Method; b, physical field initialization and boundary treatment are performed on the physical model of the porous core media, according to the boundary treatment, mirror boundary is taken as a boundary condition for the Lattice Boltzmann Method, and a simulation area and a plurality of mirror areas with the same structure with the simulation area can be obtained; c, mass force is used for driving a fluid to flow in the simulation area; d, a density distribution function of the simulation area is calculated according to the treated physical model of the porous core media; e, the core permeability is simulated and calculated according to the mass force and the density distribution function. With adoption of the method, the core permeability calculating accuracy is improved, and the core permeability calculating time is shortened.

The invention discloses an SPH (Smoothed Particle Hydrodynamics) algorithm based symmetric boundary treatment method. The method is characterized by comprising the following steps: creating a simulation model to be subjected to simulation analyzing, and initializing; calculating the pressure value, stress tensor and artificial viscosity value of each particle corresponding to the simulation model; performing search analysis on the simulation model within each set time step; calculating a state equation and control equation corresponding to the simulation model; if a symmetric boundary is in the simulation model, performing acting pair information supplementation on the simulation model; and outputting a corresponding simulation result based on the set end condition. According to the method, the existing action pair information is screened and supplemented, so that the additional time of generating mirror particles and researching can be saved while the operation of additionally generating the mirror particles and dividing background grids for the mirror particles to research is avoided, and thus the symmetric boundary treatment and the common researching calculation are unified to treat.

The invention is suitable for the field of ocean engineering and provides a deep-sea riser segmented model forward flow forced vibration experimental device under the action of uniform flow. The deep-sea riser segmented model forward flow forced vibration experimental device comprises a deep-sea riser module, end part false body modules, a fixing module, a sliding module and a measurement analysis and control module, wherein the two ends of the deep-sea riser module are connected with the end part false body modules respectively; the fixing module is connected with the end part false body modules and the sliding module respectively; the sliding module is fixedly connected with the bottom of one end of a trailer truck; and the measurement analysis and control module is arranged on the trailer truck, and is connected with the deep-sea riser module, the end part false body modules and the sliding module respectively. The invention aims to solve the problems that the conventional experimental device can only be used for simulating sea conditions with low Reynolds numbers and boundary treatment is not performed on riser segments; a riser model with an appropriate slenderness ratio is selected, so that the practical Reynolds number of 106 can be reached, and the scale effect is avoided effectively; and a flow field is simulated through false bodies, so that the problem of boundary effects on both sides of the model is solved.

The invention proposes a boundary treatment method for effectively controlling the temperature in a natural convection cavity with a partition plate. By adopting the method of the present invention, before the constant temperature bottom plate is heated, local pulse heating is performed on the bottom plate at intervals to control the alternating appearance of cold and hot cavities in the system; through the control method of the boundary, it can effectively form a high-efficiency thermal alternate distribution of cold and heat in the system. transport channel.

A particle method for simulating the boundary processing method of bubble entrainment in MCCI, the steps are as follows: 1, establish a geometric model, and input the required initial parameters; 2, initialize the density information corresponding to the boundary particles; 3, establish the density information of each particle Neighboring particle domain; 4. Calculate the boundary particle density according to the fluid particles in the boundary particle's neighbor particle domain; 5. Calculate the pressure according to the boundary particle density; 6. Solve the pressure gradient of the particle, and update the velocity and position information of the fluid particle; 7 . Determine whether to end the calculation according to whether the calculation time reaches the set calculation time. If the calculation does not end, repeat step 3-7. The calculation process is shown in Figure 1. The method of the invention fully considers the influence of the particle method on the calculation stability of the boundary pressure of the control domain by the fluctuation of the melt interface in the process of simulating the MCCI. Through this approach, the understanding of mass and energy exchange at the melt interface during MCCI can be improved.

A method for displaying a map performed by a navigation system, the method comprising: defining a matching area of a numerical map to which a photomap is matched; extracting the photomap corresponding to the matching area from a map data storage; matching a reference point of the photomap and a reference point of the numerical map; matching a scale of the photomap in line with a scale of the numerical map; and performing a boundary treatment at an overlap area of the numerical map and the photomap that are matched.