180 results about "Coarse mesh" patented technology

Simulation systems, manufacturing systems, software products and controllers are provided with multi-scale modeling in which a coarse mesh and a fme mesh that models a stimulus are decoupled. The fine mesh can be moved within the coarse mesh with a cut and paste operation. The coarse mesh is updated by sparsely propagated effects through the coarse mesh. Simulations of the invention can be conducted in real-time, and be used as controllers in manufacturing systems, such as additive manufacturing systems. A number of efficient methods are provided for solving meshing determinations that arise from movement of a stimulus modeled within a fine mesh.

A method of determining the fatigue life of a welded structure, including the steps of: creating a 3D coarse mesh model of the welded structure to be analyzed; analyzing the coarse mesh model using an FEA model to generate FEA data; identifying a critical stress location on the coarse mesh model having a through thickness stress distribution, based on the FEA data; post processing the FEA data in the middle portion of the through thickness stress distribution while excluding the through thickness stress distribution near the edges of the identified critical stress location to determine a peak stress; and determining a fatigue life of the welded structure at the identified critical stress location, dependent on the determined peak stress.

A flat plate heat transfer device contacted with heat source and heat-emitting unit at both end transfers heat generated at the heat source to the heat-emitting unit horizontally. The device includes a thermally-conductive flat case containing a working fluid evaporated with absorbing heat from the heat source and condensed with emitting heat to the heat-emitting unit; and a mesh aggregate installed in the case so that coarse and fine meshes in which wires are woven to be alternately crossed up/down are vertically laminated in contact. The coarse mesh gives main-directional and sub-directional vapor dispersion channels with different sectional areas at each crossing point of the mesh wires for vapor to flow therethrough. The main-directional vapor dispersion channel with relatively larger sectional area is parallel to heat transfer direction. The fine mesh gives liquid flow channels along running direction of the mesh wire from each crossing point of the mesh wires.

A supported lattice is disclosed having a support substrate formed of a plurality of resilient filamentary members braided together to yield a coarse mesh having relatively large interstices and a cell cultivation lattice formed of a plurality of flexible filamentary members braided together and with the resilient filamentary members to form a fine mesh having small interstices. The cell cultivation lattice provides a bed adapted for growing cells in a two-dimensional array across the large interstices of the support substrate to form a continuous surface of living tissue useful to form a graft.

The invention discloses a layered rotary rice stone removing device, which comprises a cylinder body, a discharge plate is connected to the lower side of the outer end of the discharge port, and a scraper is arranged on the upper end of the fine sieve plate close to the inner wall of the cylinder body. plate. In this invention, the rice enters from the feeding hopper, and the motor drives the coarse sieve plate and the fine sieve plate to rotate, so that the rice falls on the coarse sieve plate first, and the rotating coarse sieve plate and fine sieve plate are not easy to block the sieve holes, improving the Screening efficiency, moreover, the conical coarse sieve and fine sieve increase the fluidity of rice, which is conducive to screening, large stones are sifted out by the coarse sieve and thrown to the support plate, while small stones are leaked from the fine sieve Next, the rice flows out directly from the discharge port, and the blower on the lower side blows the air upwards, along the sieve holes on the coarse sieve plate, so as to blow out the bran residue and debris. The area of ​​the coarse sieve plate is relatively large, so that the rice is on the top It is more scattered, and the chaff residue inside is easier to be blown out, which is cleaner and improves the cleaning effect.

The invention discloses a method suitable for the transportation burnup coupling calculation of a nuclear reactor. The method comprises the following steps that: 1: carrying out transportation calculation on the nucleus concentration of burnup step initiation to obtain a coarse mesh parameter and a microcosmic reaction rate; 2: carrying out burnup calculation by the microcosmic reaction rate and the nucleus concentration to obtain the nucleus concentration estimated by a burnup step end; 3: carrying out the transportation calculation by the estimated nucleus concentration to obtain the coarse mesh parameter and the microcosmic reaction rate; 4: dividing burnup CMFD (Coarse Mesh Finite Difference) substeps in a burnup step, and carrying out linear interpolation on the stored coarse mesh parameter; 5: updating the microcosmic reaction rate of the burnup CMFD substeps by the coarse mesh parameter obtained in the 4 and thin mesh neutron flux in the 3; 6: carrying out the burnup calculation by the microcosmic reaction rate on the burnup CMFD substeps to obtain the accurate nucleus concentration of the burnup step end; and 7: judging whether a burnup step number is consistent with an input value or not to judge whether calculation is finished or not. By use of the method, on a premise that extremely high accuracy is guaranteed, the step length of the burnup calculation is extremely enlarged, and calculation time in the whole service life of the nuclear reactor is shortened.

The present invention discloses a method for calculating lightning induction voltage of an overhead power line tower. The method mainly comprises the following steps of: (1) calculating a space lightning electromagnetic field while the influence of the tower is taken into consideration, wherein a sub-grid technology based finite-difference time-domain method is adopted in which a coarse mesh is generated for air space and a fine mesh is generated for the tower; (2) applying a two-dimensional calculation result of the lightning electromagnetic field to field decomposition of a three-dimensional space structure formed by an overhead power line and a lightning current return stroke channel, wherein the lightning electromagnetic field is generated by stimulation of lightning return stroke current; and (3) calculating the lightning induction voltage of the overhead power line and extracting the lightning induction voltage of the tower, wherein the lightning induction voltage of the overhead power line is calculated by using an Agrawal model and an FDTD method, and the tower position is located by grid query and the lightning induction voltage of the tower is extracted. The method can be used for effectively and more accurately estimating the lightning induction voltage of the overhead power line and the lightening induction voltage of insulators and lightning arresters of the tower.

The invention discloses a transient electromagnetic three-dimensional FDTD forward modeling multi-resolution mesh division method, which comprises the steps of: using coarse meshes for division; establishing an FDTD three-dimensional forward model; carrying out local-refinement division on parts requiring attention of the model, so as to form fine meshes, thus a calculation region of the entire model at least comprises two sets of meshes used for describing a target with dimensional difference exceeding a preset value; determining electric field and magnetic field components in the fine meshesbased on a Maxwell equation set; determining and updating boundary conditions of the coarse and fine meshes based on a diffusion and propagation time sequence of the electromagnetic fields; and unifying the coarse and fine meshes in time and space domains. The transient electromagnetic three-dimensional FDTD forward modeling multi-resolution mesh division method reduces the number of coarse meshes, greatly shortens the time of a single iteration naturally, and further shortens the overall calculation time.

Methods for making a screen assembly for a vibratory separator, a screen assembly made by such methods, and a method for separating components of a fluid with a vibratory separator with such a scren assembly; the method in certain aspects including sewing together with sewing material at least two layers of screening material (e.g., two, three, four or more layers; e.g, but not limited to, layers of fine stainless steel screening material), placing the sewn-together layers of screening material in a heating apparatus, placing a coarse mesh layer adjacent the layers of screening material on the heating apparatus, optionally placing adjacent the coarse mesh layer a support with heat activated material thereon for adhering the support to the coarse mesh layer, and heating the coarse mesh layer and the layers of screening material to adhere them together; and, if a support is present, also heating the support to adhere the support to the coarse mesh layer, and, optionally, with some adherence of the coarse mesh layer to the layers of screening material with the heat activated material.

The present disclosure relates to a class of impact copolymer polypropylene (ICP) compositions exhibiting the advantageous combination of excellent tiger (flow) marking performance in large/long molded parts, very low gels count and exceptional mold flowability (high MFR) despite the high viscosity ratio (e.g., >4) between rubber and propylene based matrix phases. Furthermore, it has been surprisingly found that the inventive compositions are associated with a low gels count even when using a quite coarse mesh wire screen, e.g., 60 mesh wire screen, independent of screw type e.g., twin or single screw. Finally, the inventive compositions exhibit significantly reduced the levels of volatiles, and excellent stiffness-impact balance used as standalone materials or in filled compounds. The significantly reduced number of large gels leads to excellent surface appearance and paintability of the molded parts. The composition has the advantage of process simplicity, process efficiency and simplicity of compositional structure.

The invention discloses a method for oil reservoir numerical simulation. The method comprises the steps that an initially selected near-well area is determined according to a near-well effect occurrence area; pressure equipotential lines in the initially selected near-well area are determined according to a well shaft diameter and a seepage equation generated when well shaft production reaches a stable state; a final near-well area is determined according to each pressure equipotential line; according to the pressure equipotential lines inside the final near-well area, a near-well coarse mesh model of the final near-well area is established; a far-well area model is established for an oil reservoir area outside the final near-well area; and a seepage model concerning oil reservoir values is determined according to the near-well coarse mesh model and the far-well area model, so that pressure distribution and yield of the oil reservoir area can be predicted. According to the invention, the initially selected near-well area is firstly determined according to the near-well effect occurrence area; then, the final near-well area is determined according to the pressure equipotential lines in the initially selected near-well area. In this way, the near-well coarse mesh model of the final near-well area can accurately simulate influences of near-well effects; the quantity of meshes is small; and the computation amount is small.

The invention discloses a method for accelerating the finite element solution of the elastic deformation of an object mesh model. For a nonlinear elastic object model, given discrete is a coarse meshand a fine mesh formed by units and vertices, the displacement field of the coarse mesh is solved by a finite element method using a piecewise linear matrix function as a displacement interpolation function, and the displacement field of the fine mesh is solved by the finite element method using linear interpolation function as displacement interpolation function. The shape function of the finiteelement method corresponding to the coarse mesh is a specially designed piecewise linear matrix function, and the piecewise linear matrix function is a discontinuous function. The method is used for simulating the deformation of non-uniform and heterogeneous non-linear elastic objects, and the non-linear constitutive relation is also used for predictive simulation of heterogeneous elastic bodies on a coarse mesh to obtain acceleration of two to three orders of magnitude and make good approximation to the overall stiffness of the system.

Disclosed is a flat plate heat transfer device, which includes a thermally conductive flat case installed between a heat source and a heat emitting unit and containing a working fluid evaporated with absorbing heat from the heat source and condensed with emitting heat to the heat emitting unit; and a mesh layer aggregate installed in the flat case and having a structure that a fine mesh layer for providing a flowing path of liquid and a coarse mesh layer for providing a flowing path of liquid and a dispersion path of vapor simultaneously are laminated. On occasions, the coarse and the fine mesh layers are alternately laminated repeatedly, and the fine mesh layer is replaced with a wick structure. The coarse mesh layer is preferably a screen mesh layer with wire diameter of 0.2 mm ~ 0.4 mm and mesh number of 10 ~ 20. This device improves heat transfer performance.

The invention provides an irrigation device, and belongs to the technical field of garden equipment. The irrigation device comprises a rain collecting funnel, a water seepage pipe and a water storage tank, wherein one end of the water seepage pipe is connected to the bottom end of the rain collecting funnel, and the other end of the water seepage pipe is connected to the water storage tank; a coarse mesh filter layer, a coarse gravel layer and a gravel layer are sequentially arranged on the water seepage pipe from top to bottom; an anti-blockage net is connected to the upper part of the rain collecting funnel; evaporating holes are uniformly formed in the upper end face of the water storage tank; and an isolating net is arranged on two end faces of the evaporating holes. The irrigation device disclosed by the invention has the beneficial effects of simple structure and good water-retaining property, and the utilization rate of rainwater resource is improved.

The invention relates to an acceleration method for high fidelity space-time neutron dynamic calculation. The acceleration method comprises the following steps: firstly, calculating neutron flux density and pioneer nucleus concentration of a reactor in a clinical state by adopting a one-step method; secondly, executing cross section disturbance, and starting to carry out space-time neutron dynamic calculation; thirdly, carrying out transporting calculation in a large time step by using a one-step method, and obtaining estimated neutron flux density; and fourthly, carrying out CMFD calculation in a medium time step, accelerating by adopting a global acceleration factor method, carrying out point-reactor calculation in the minimum time step, correcting the amplitude of coarse mesh flux by using point-reactor amplitude, and then updating the neutron flux density of a fine mesh by using the updated coarse mesh amplitude. The acceleration method provided by the invention has the advantages that time steps of the high fidelity space-time neutron dynamic calculation can be greatly reduced while guaranteeing the calculation accuracy, the calculation time on each time step is also reduced, and the time consumed by calculation of the whole calculation process is greatly shortened.

The invention discloses a device for testing a filtration resistance of a coarse mesh filtration membrane in a dynamic membrane bioreactor. The device comprises a filtration pool (1), a filtrate collection device (3) and a detection device (4) for detecting changes of the filtrate collection device, wherein the coarse mesh filtration membrane (2) is arranged nearly the bottom of the filtration pool (1); the filtration pool (1) is divided into a sludge suspension region (11) arranged at the upper end of the coarse mesh filtration membrane (2) and a filtrate region (12) arranged at the lower end of the coarse mesh filtration membrane (2) by using the coarse mesh filtration membrane (2); the filtrate in the filtrate region is collected into the filtrate collection device ( 3); the device is characterized in that the external side of the filtration pool (1) is provided with an aeration pool (5) for carrying out sludge culture; and the sludge suspension in the aeration pool (5) is continuously transported into the sludge suspension region (11) of the filtration pool (1). The device provided by the invention has the advantages of convenience for operation, low cost and the like, and canbe used for carrying out the quantitative research on the filtration and pollution performance of the coarse mesh filtration membrane in the dynamic membrane bioreactor.

The invention provides an embedded discrete fracture model-based fractured well modeling and simulation method. The method includes: dividing a bed rock system orthogonal coarse meshes, and extracting coarse mesh nodes and fracture information; dividing the system into a bed rock system and a fracture system, and establishing a flow mathematical model for the bed rock system and the fracture system each; establishing a corresponding embedded discrete fracture net model; establishing a bed rock system numerical calculation format based on a simulation finite difference method; analyzing the numerical calculation format of fractures in bed rocks in three different embedded manners; establishing a numerical calculation format of an embedded discrete fracture net system based on a control volume finite difference method; and serving the fracture system as a source term of the bed rock system, and establishing an embedded discrete fracture flow mathematical model by coupling the fracture system and the bed rock system. The embedded discrete fracture model-based fractured well modeling and simulation method can avoid a complicated unstructured mesh generation process, and improve the accuracy and the high efficiency of a fractured well fracture description and simulation method.

The invention relates to a subregion local variable-density non-equidistant dual mesh division method for a complex mountainous region. The method comprises the steps that an overall model framework of the complex mountainous region is established according to the earth surface elevation and the calculated region range, the whole model framework is divided through square coarse meshes in sequence, a complex earth surface nearby region is divided through variable-density densified non-equidistant meshes, a seismic origin nearby region is divided through variable-density densified meshes, and other regions are divided through dual uniformly-multiplied densified meshes. By means of the meshes, the complex earth surface morphology and the distribution conditions of complex media nearby the earth surface can be depicted accurately and subtly, the boundary conditions nearby the complex earth surface can be achieved accurately and stably, the problem of a large error nearby a source point can be solved on the premise of not substantially increasing the calculated amount, the calculating efficiency can be improved substantially on the premise of guaranteeing the calculating accuracy, and spending of too much mesh generation cost, an extra storage space and extra calculated amount are not needed.

A method for making a screen assembly for a vibratory separator, the method including, in at least certain aspects, gluing together with glue at least two layers of fine screening material, allowing the glue to set, preheating the glued together at least two layers of fine screening material, placing the thus-preheated at least two layers of fine screening material in a heating apparatus, placing a coarse mesh layer on the at least two layers of screening material on the heating apparatus, placing on the coarse mesh layer a support with heat activated material thereon for adhering the support to the coarse mesh layer, and heating the coarse mesh layer, at least two fine layers of fine screening material, and the support to adhere the support to the coarse mesh layer and to glue the at least two layers of fine screening material to the coarse mesh layer.

The invention discloses an anti-damaged cuttlefish egg hatching and releasing device. Therefore, hatched young cuttlefish can smoothly enter natural waters. Harmful organisms are effectively preventedfrom entering a hatching net box so that fertilized eggs are not damaged. The anti-damaged cuttlefish egg hatching and releasing device comprises a hatching mesh box and a floating-type anti-damagedcuttlefish egg hanging-mounted device. Fixed fine-mesh boards are arranged on the four side surfaces and the bottom surface of the hatching mesh box. The top surface of the hatching mesh box is made up of a coarse-mesh board. Additionally, the mesh diameter of each mesh of the coarse-mesh board is larger than that of each mesh of each fixed fine-mesh board. The floating-type anti-damaged cuttlefish egg hanging-mounted device comprises vertical guide rods, a floating fine-mesh board, buoyancy blocks and a cuttlefish egg hanging-mounted structure. The vertical guide rods are arranged on outer side surface of the hatching mesh box. The floating fine-mesh board elevates along the vertical guide rods and is located above the coarse-mesh board. The buoyancy blocks are arranged on an upper surface of the floating fine-mesh board. The cuttlefish egg hanging-mounted structure is arranged on the floating fine-mesh board.

The invention discloses a large-scale parallel method suitable for coupled transportation calculation. Calculation of a characteristic line method, calculation of a one-dimensional discrete ordinate method and accelerated calculation of coarse mesh finite difference are all expanded into triple parallelism corresponding to a two-dimensional characteristic line method, so that a mismatching phenomenon is thoroughly eliminated. According to the method, the parallelization of various methods is realized based on two-dimensional and one-dimensional coupled transportation methods, and the problem of resource waste caused by mismatching of various coupled algorithms during parallelization is solved.

The invention discloses a coarse mesh-based rapid turbulence wall surface function aerodynamic force prediction method, which comprises the following steps of S1, establishing a wall surface mesh model of an aircraft, and obtaining an initial value of wall surface shear stress of the aircraft in a wall surface mesh; s2, acquiring the friction speed of the aircraft in the wall grid; S3, calculating a dimensionless wall surface distance in the wall surface mesh; S4, calculating the friction speed in the wall surface mesh; S5, calculating a residual error; S6, judging whether the friction speed is converged or not; S7, calculating a turbulence viscosity coefficient in the wall surface mesh; and S8, updating the turbulence viscosity coefficient of the virtual points in the wall surface mesh. The invention solves the problems that in the prior art, when engineering complex turbulent flow is simulated, due to the fact that meshes near a wall face suddenly increase, the calculation convergence speed is reduced, many internal resources of a computer are occupied, and the numerical value rigidity problem is serious.

The invention discloses a method for obtaining satellite surface potential based on multi-time-scale particle push. A division method of different mesh sizes is adopted at different regions for a simulation space according to space plasma characteristic and satellite size, namely fine mesh division is adopted at a region close to a satellite, and coarse mesh division is adopted at a region away from the satellite; thus, the operation time is saved to a great extent on the premise of guaranteeing certain computing accuracy, and the contradiction between the computing efficiency and accuracy of PIC (Particle-In-Cell) surface charge simulation analysis of a geostationary orbit is solved better; electrons and ions are pushed by using different time steps respectively, nearly half of the computation can be saved on the premise of guaranteeing the computing accuracy, and the computing efficiency is improved.