21 results about "Solid region" patented technology

The invention belongs to the technical field of numerical simulation, and particularly relates to a flow field distribution numerical simulation method based on a simplified modeling strategy, compared with a traditional method, solid modeling is replaced by a porous medium model, geometric construction of a solid area in a computational domain is greatly simplified, structured grids can be adopted, and the flow field distribution numerical simulation method based on the simplified modeling strategy is achieved. The solution precision and the calculation efficiency are improved, and an efficient and accurate solution is provided for numerical simulation in engineering application.

The invention belongs to the technical field of acoustic lenses, and discloses a high-frequency vortex sound field lens which comprises a stainless steel sheet substrate, the center area of the substrate is a solid area, and a periodic spiral line hollow structure is formed on the periphery of the solid area through laser processing; the area where the spiral line hollow structure is located allows sound waves to pass without shielding, and the solid area blocks sound wave propagation. The ultra-short pulse laser micromachining technology is adopted, the spiral line hollowed-out structure with the screw pitch, the line width and the spiral angle strictly matched with the high-frequency sound wave wavelength can be accurately etched in the surface of the stainless steel sheet, the spiral phase gradient is accurately constructed through the acoustic impedance difference of hollowed-out area conduction-solid area blocking, and the spiral phase gradient is accurately measured. The problem of phase error amplification under high frequency is effectively suppressed, the orbital angular momentum transfer efficiency is improved to 90% or above, and stable generation of a high-frequency vortex sound field is successfully realized.

The invention provides an equivalent materialization modeling and efficient simulation method for an additive manufacturing lattice structure, and belongs to the technical field of additive manufacturing and structure simulation. The method comprises the following steps: firstly, designing and preparing a standard test sample consistent with a real sample piece in process according to dot matrix geometric characteristics of the real sample piece, and obtaining equivalent material parameters through mechanical test; secondly, extracting the outer contour of a dot matrix area from the original CAD model, constructing a continuum entity to replace an original dot matrix structure, and fusing the continuum entity with an entity area to form a simplified model; and endowing equivalent material parameters to the entity area, and performing thermal-mechanical coupling finite element calculation in simulation software to obtain stress and deformation distribution in the forming process. According to the method, huge calculation overhead caused by full-dot-matrix fine modeling is avoided, the simulation efficiency is remarkably improved, meanwhile, the prediction precision is guaranteed through experiment-driven equivalent material parameters, the method is suitable for various dot matrix configurations and metal material systems, and efficient and high-fidelity simulation of additive manufacturing complex dot matrix components is achieved.

The invention belongs to the related technical field of metamaterials, and discloses a design method and a product of a zero / negative thermal expansion coefficient metamaterial made of a single solid material. The method comprises the following steps: dividing a design domain into a high-pressure gas region, a low-pressure gas region and a solid region, wherein the solid region is used for isolating the high-pressure gas region from the low-pressure gas region; setting a thermal expansion coefficient and an elastic modulus of the solid area; adjusting the form of the solid region and the air pressure of the gas region so that the deformation of the solid region generated under the pressure difference between the high-pressure gas region and the low-pressure gas region is equal to zero heat or negative thermal expansion of the solid region generated under the temperature change under the condition that the temperature in the design region is changed; in this way, the required form and air pressure of the solid area are obtained. According to the invention, the thermal expansion performance is accurately regulated and controlled, and the method is suitable for application scenes with high requirements on size thermal stability, such as aerospace and precise instruments.

A metamaterial structure with a gradient distribution of material properties, its implementation method, and system are disclosed. The structure comprises a metamaterial structural configuration and a gradient distribution of material properties within the solid region of the structural configuration. The implementation method includes: determining overall functional performance targets, local service response characteristics, and a design domain; designing an initial metamaterial structural configuration that satisfies or approximates the overall functional performance targets under the assumption of homogeneous material properties; optimizing and adjusting the gradient distribution of material properties within the solid region based on the response results, while maintaining the basic spatial distribution of the initial metamaterial structural configuration, thereby improving the local service response characteristics and keeping the overall functional performance targets within the allowable deviation range; and obtaining a metamaterial structure with the target gradient distribution of material properties. This invention can improve local service response and enhance the engineering applicability of the structure while ensuring overall functional performance.

The invention belongs to the technical field of composite material structural part manufacturing, and particularly relates to a thermal simulation method for a temperature field of a composite material part forming tool. Comprising the following steps that 1, environment construction is carried out according to the type of a composite material forming tool, and the environment part comprises construction of a fluid model and a domain type; 2, defining material parameters according to the physical properties of the composite fluid; 3, according to the heat source heating system in the composite material forming tool forming process and the heat exchange mode of a heat source and a tool, a forming process model is built; 4, based on a fluid area control equation and a solid area control equation of three basic calculus equations of mass, momentum and energy, carrying out simulation calculation of a composite material forming tool temperature field through a velocity vector model; and 5, carrying out data processing on a resolving result, and viewing a cloud picture in a graphic window. By constructing a typical thermal model, parameters can be directly changed, the method is used for temperature field simulation of similar forming tool structures, the stability and accuracy of the simulation process are kept, and the simulation efficiency is improved.

Implementations relate to methods, systems, and computer-readable media to detect connected solid regions in solid geometry objects. In some implementations, the method may include obtaining a mesh for a three-dimensional (3D) object, wherein the mesh includes a plurality of polygons, identifying, based on the plurality of polygons, connected components of the 3D object, determining, based on the connected components, two or more topologically interconnected sections of the 3D object, identifying a containment relationship between the two or more topologically interconnected sections of the 3D object, determining, based on the containment relationship, one or more distinct solid regions of the 3D object, determining an updated state of a first distinct solid region of the 3D object, wherein the updated state includes an updated position or an updated orientation, and causing the first distinct solid region of the 3D object in the updated state to be displayed within a virtual environment.

The present application belongs to the technical field of continuous casting, and particularly relates to a method for numerical simulation of flow field distribution of a continuous casting tundish. Compared with a traditional method, the present application replaces entity modeling with a porous medium model, greatly simplifies the geometric construction of the solid region inside the calculation domain of the continuous casting tundish, enables the use of a structured grid, improves the solving precision and calculation efficiency, and provides an efficient and accurate solution for the numerical simulation of the continuous casting tundish.

The application discloses a kind of laser fusion forging multi-physical field integrated numerical simulation method and system, belong to additive manufacturing technical field, numerical simulation method includes: establishing three-dimensional geometric calculation domain;Based on calculation domain, through the introduction of mass source term in mass conservation equation, the coaxial powder feeding laser cladding process is simulated;Based on mass source term, solve phase fraction field distribution, and then determine metal and gas interface;Based on phase fraction field, determine the temperature field distribution of calculation domain;Based on phase fraction field and temperature field, the material properties of each region of calculation domain are dynamically updated;Under the constraint of updated material properties, the flow field of liquid metal is calculated based on fluid momentum conservation equation;Based on phase fraction field and temperature field, solve solid momentum conservation equation, determine the stress field of solid region.The application establishes a unified multi-physical field solving framework, avoids the problem of heat-flow and heat-force model fragmentation in traditional method, effectively improves the integrity and accuracy of defect prediction.

The invention provides a design method of a multifunctional superstructure capable of customizing low-frequency vibration reduction and bearing capacity, and relates to the technical field of structural engineering.The design method comprises the following steps that firstly, a size parameter (T), a thickness parameter (delta) and cutting parameters (a, b, c and d) are set, and a unit cell main body structure is generated based on a P-type three-period minimal curved surface (TPMS) equation; a solid area is generated through expansion of the external TPMS, a hollowed area is defined by the internal TPMS, and difference set operation is executed to form a hollowed structure; further defining a tailoring pattern, and tailoring in xy, xz and yz directions; and finally, mass blocks are arranged on six planes inside. According to the technical scheme, the problems that in the prior art, a traditional vibration reduction structure is single in function, and low-frequency vibration reduction and high-bearing-capacity requirements are difficult to consider are solved.

The present invention relates primarily to the field of 3D interconnection technologies for microelectronics, but also to any application requiring high wettability contrast on the micrometer scale. The proposed method makes it possible to manufacture a wafer (1) having a main surface (10) with solid regions (101) and micro- or nanostructured regions (102) having a wettability contrast between them of greater than 90°, preferably greater than 120°, each structured region (102) extending around the solid region (101), the wafer comprising a substrate (11) having a first level (111) mainly made of a semiconductor material and a second level (112) mainly made of a dielectric material, the solid regions and each structured region being formed on the second level of the substrate, each structured region having a plurality of protrusions (131) mainly made of said dielectric material, the wafer being such that the protrusions have faceted edges.

The invention belongs to the technical field of continuous casting, and particularly relates to a numerical simulation method for flow field distribution of a continuous casting tundish, compared with a traditional method, solid modeling is replaced by a porous medium model, geometric construction of a solid area in a continuous casting tundish computational domain is greatly simplified, structured grids can be adopted, and the flow field distribution of the continuous casting tundish can be simulated. The solution precision and the calculation efficiency are improved, and an efficient and accurate solution is provided for numerical simulation of the continuous casting tundish.

The application belongs to the technical field of metamaterials, and discloses a design method and product of a zero / negative thermal expansion coefficient metamaterial composed of a single solid material. The method comprises the following steps: dividing a design domain into a high-pressure gas region, a low-pressure gas region, and a solid region for isolating the high-pressure gas region and the low-pressure gas region; setting the thermal expansion coefficient and the elastic modulus of the solid region; adjusting the shape of the solid region and the gas pressure of the gas region so that the deformation of the solid region under the pressure difference between the high-pressure gas region and the low-pressure gas region at a changed temperature in the design domain is equal to the zero thermal or negative thermal expansion of the solid region under the temperature change, thereby obtaining the required shape of the solid region and the gas pressure. Through the application, the thermal expansion performance is accurately controlled, and the application is suitable for aerospace, precision instruments and other application scenarios with high requirements for size thermal stability.

This invention discloses a method for designing an adjustable porous wave-leading biomimetic blade. The method includes dividing a reference blade into a fixed porous region, an adjustable porous region, an adjustable solid region, and a fixed solid region. The leading edge of the adjustable solid region is designed as a wave-leading edge, and its trailing edge is designed to match the leading edge of the fixed solid region. Similarly, the leading edge of the fixed porous region is designed as a wave-leading edge, and its trailing edge is designed to match the leading edge of the adjustable porous region. Finally, the trailing edge of the adjustable porous region is designed to match the wave configuration of the leading edge of the adjustable solid region. These components are combined to obtain the adjustable porous wave-leading biomimetic blade. The adjustable porous wave-leading biomimetic blade designed by this invention can adjust the relative position between the porous wave configuration and the solid wave configuration. Only one biomimetic blade prototype needs to be fabricated to conduct experimental research on the influence of the relative position between the two wave configurations on the noise reduction effect.

The application discloses a kind of simulation method and system of aircraft brake wheel temperature field, it is related to temperature field simulation field, the method includes determining the three-dimensional grid model of solid region and setting range fluid region of brake wheel;Determine the material of each fluid region, the material parameter of fluid region and solid region;Determine the flow field boundary of fluid region to fluid region and the fluid-structure coupling interface between solid region and fluid region;Determine brake disc brake power fitting function and non-brake disc loss power function;And according to brake disc brake power fitting function and non-brake disc loss power function determine heat source load;According to three-dimensional grid model, the material of each fluid region, the material parameter of fluid region, the material parameter of solid region, flow field boundary, fluid-structure coupling interface and heat source load, utilize the fluid calculation module of ANSYS system to simulate aircraft brake wheel temperature field.The simulation precision of brake wheel temperature field can be improved by the application.

This invention discloses a method and application for generating layered rotating hybrid TPMS porous structures based on continuous parameter fields, comprising the following steps: dividing the target TPMS porous structure into functional layers along the height direction; inputting the functional layer parameters and transformation functions respectively to obtain a continuous rotation angle field and a continuous hybrid weight field; performing a reverse rotation mapping on the input coordinates of the TPMS implicit functions as described above; performing weighted coupling on at least two basic TPMS implicit fields to obtain a hybrid TPMS implicit field; and determining the TPMS solid region and performing Boolean coupling between the TPMS solid region and the macroscopic boundary constraint region to obtain the final porous structure region. This invention, by introducing a continuous rotating coordinate reverse mapping before evaluating the implicit functions, instead of performing geometric rotation processing on the generated mesh model, can reduce the risk of mesh tearing, non-manifold edges, and local distortion, and improve model continuity and manufacturability.

The invention discloses an interbody fusion cage, and relates to the field of orthopedic medical instruments. Comprising a solid region and a porous structure region, the entity area comprises an upper end face, a lower end face and an instrument groove. The porous structure area is arranged on the outer surface and inside the interbody fusion cage; the porous structure area is a pore structure formed by a plurality of rods and provided with a plurality of through holes. The interbody fusion cage is not provided with a bone grafting bin, the porous structure areas are distributed on the outer surface and in the interbody fusion cage, the bone fusion area is increased, bone ingrowth is better facilitated, meanwhile, the porous structure has good mechanical performance, the elastic modulus of a product is reduced, enough mechanical support is provided, and the bone grafting effect is improved. And the capability of preventing the fusion cage from falling off is improved.

The invention belongs to the technical field of engineering, and discloses a sleeve finite element model building method for numerical calculation of a heat flow field and a related device.A two-dimensional axial symmetry model of a sleeve is built according to the structural characteristics of a preset sleeve, and the structural characteristics comprise a solid area and a fluid area of the sleeve; repairing geometric defects in the two-dimensional axisymmetric model, and dividing a fluid region in the two-dimensional axisymmetric model into a geometric shape containing two groups of opposite sides to obtain a preprocessed two-dimensional axisymmetric model; drawing a grid of a fluid area and a grid of a solid area on the processed two-dimensional axisymmetric model to obtain a two-dimensional axisymmetric finite element model; and rotating the two-dimensional axisymmetric finite element model around the symmetry axis of the sleeve by a circle to obtain a sleeve finite element model for numerical calculation of a heat flow field. On the basis of the sweeping method, the casing heat flow field unstructured grid can be efficiently and accurately drawn, and then the accuracy and efficiency of casing heat flow field analysis are improved.

The invention discloses a laser fusion forging multi-physics field integrated numerical simulation method and system, and belongs to the technical field of additive manufacturing. The numerical simulation method comprises the steps that a three-dimensional geometric computational domain is established; based on the computational domain, a mass source item is introduced into a mass conservation equation to simulate the coaxial powder feeding laser cladding process; based on the mass source item, phase fraction field distribution is solved, and then a metal and gas interface is determined; determining temperature field distribution of the computational domain based on the phase fraction field; based on the phase fraction field and the temperature field, dynamically updating the material attribute of each region of the computational domain; calculating a flow field of the liquid metal based on a fluid momentum conservation equation under the constraint of the updated material attributes; and based on the phase fraction field and the temperature field, solving a solid momentum conservation equation, and determining a stress field of the solid region. According to the method, a unified multi-physics field solving framework is established, the problem of heat-flow and heat-force model separation in a traditional method is avoided, and the integrity and accuracy of defect prediction are effectively improved.

The invention mainly relates to the technical field of microelectronic 3D (three-dimensional) interconnection, but is also suitable for any application requiring micron-sized high wettability contrast. The proposed method can produce a wafer (1) comprising a main surface (10) having a solid region (101) and a micro-or nanostructured region (102), the wettability contrast between which is greater than 90 DEG, preferably greater than 120 DEG, each structured region (102) extending around the solid region (101). The wafer comprises a substrate (11), the substrate (11) comprising a first layer (111) based on a semiconductor material and a second layer (112) based on a dielectric material, a solid region and each structural region being formed in the second layer of the substrate, each structural region having a plurality of terminals (131) based on a dielectric material, the wafer having the terminals having facet ends.

This invention provides an expanded food containing a milk protein in a proportion of 75 mass % or more based on the total protein, wherein the expanded food has a pore structure as measured with an X-ray computed tomography scanner, the structure satisfying the following ranges:Specific Surface Areas:(1A) Specific surface area of solid region: 6 to 22 / mm; and(1B) Specific surface area of void: 3 to 8 / mm.