5 results about "Thin-shell structure" patented technology

The invention discloses a superstructure shell device for reducing noise radiation, which comprises an outer shell and an inner shell, and is characterized in that the outer shell and the inner shell are of a thin shell structure which is coaxially arranged; and one or more annular noise reduction devices, wherein the annular noise reduction devices are arranged between the outer layer shell and the inner layer shell. The connecting device is used for coaxially and fixedly connecting the outer-layer shell, the annular noise reduction device and the inner-layer shell; wherein each annular noise reduction device comprises an integrated circular ring frame and at least one closed particle damping cavity, the circular ring frame comprises a plurality of torsion structure cavities and connecting rods in the annular direction, the torsion structure cavities and the connecting rods are periodically arranged in the annular direction, and the torsion structure cavities and the connecting rods form periodic structure units in a plane; the particle damping cavity is defined by a cover plate and the torsion structure cavity, and the particle damping cavity is filled with spherical particles.

This invention discloses a hollow structure Go piece, belonging to the technical field of chess products. The invention includes a Go piece body, which consists of a shell, a hollow area, and internal supports. The Go piece body adopts a thin-shell structure design, with hollow areas on the shell and internal supports arranged in the non-hollow areas. Specifically, the pentagram series hollow Go pieces use a fully supported structure, while the snowflake series hollow Go pieces feature a combination of columnar and radial support structures. This invention optimizes the layout of the hollow areas and internal supports through topological modeling, significantly reducing weight, achieving a lightweight Go set, and facilitating portability while effectively ensuring the structural strength and durability of the Go pieces. This invention relies on structural optimization to precisely control the center of gravity of the Go pieces, ensuring a high degree of consistency in the center of gravity of each piece through refined structural proportions, effectively improving placement stability and game feel. This invention features a novel structure, diverse shapes, and strong practicality, effectively solving the technical problems of traditional solid Go pieces, such as heavy weight, inconvenience in carrying, difficulty in accurately controlling the center of gravity, and poor consistency.

The present application belongs to the technical field of engineering structure optimization design, and discloses a kind of topological optimization method and equipment of three-dimensional curved surface composite material thin shell structure, steps are as follows: S1, using conformal geometric mapping algorithm three-dimensional curved surface grid is mapped to the parameterization coordinate of two-dimensional plane parameter domain angle-preserving, obtain the mapping relationship of three-dimensional curved surface composite material thin shell structure from three-dimensional curved surface to two-dimensional plane;S2, construct shell element stiffness matrix of finite element grid;S3, in two-dimensional plane parameter domain, with the relative density of shell element and the direction of element as design variable, establish the topological optimization model of finite element grid based on conformal mapping;S4, based on moving asymptote method and topological optimization model to update design variable;S5, based on the design variable and mapping relationship of updated inversion mapping back original three-dimensional curved surface, thus obtain the three-dimensional configuration of optimal material distribution of three-dimensional curved surface composite material thin shell structure.The present application improves optimization efficiency.

This invention belongs to the field of structural optimization technology. It discloses a full-scale design method for porous stiffened shells based on multi-piece isogeometric topology optimization. The steps are as follows: (1) Divide the thin shell structure and the stiffening region into high-order NURBS element meshes respectively; (2) Use isogeometric Kirchhoff-Love shell elements to describe the thin shell structure and three-dimensional solid elements to describe the stiffening region. Decompose the high-order NURBS element mesh into Bézier elements, and then construct solid-shell coupled elements; (3) Set the equivalent density as a design variable on each solid element. Transform the design variable into the equivalent density on the control points of the thin shell by applying mapping constraints. At the same time, introduce local volume constraints on the design variable to obtain bone-like porous stiffening, and then construct a full-scale multi-piece isogeometric topology optimization model for porous stiffened shells, and finally obtain the optimized porous stiffened shell structure. This invention improves applicability.

This invention discloses a splicing mold for autoclaving cylindrical composite parts, comprising multiple side parting components and multiple corner parting components. The side and corner parting components are sequentially arranged circumferentially to form a cylindrical structure that matches the inner cavity shape of the composite part to be formed. Adjacent side and corner parting components are fixedly connected by tensioning components located inside the formed cylindrical structure. This invention utilizes a splicing structure to effectively match the inner cavity surface of the cylindrical part. The thin-shell structure improves the thermal uniformity of the mold, ensuring the quality of the autoclaved composite parts. The overlapping fit between the parting components enables rapid assembly and positioning, ensuring the accuracy of the mold surface. Furthermore, the cylindrical structure of the mold allows for rapid demolding of the parting components, facilitating the demolding operation.