12 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.

Systems and methods for elastically foldable structures are described. The high-strain composite thin-shell structures offer high stiffness to mass ratio and increased packaging efficiency, with the additional advantage that their deployment is aided by releasing the strain energy stored in the elastic folds in a controlled quasistatic manner.

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 relates to a deformation correction fixture and method for a thin-walled welded titanium alloy support, belonging to the field of metal material machining technology. By utilizing this novel process technology and taking advantage of the similarity between the heat treatment and forming temperatures of titanium alloys, this invention achieves stress relief and shape correction within the weld seam in a single process. The use of a combined, retractable, dedicated correction fixture effectively ensures the spatial relationship between the base assembly surface of the support component and the pipe end axis, while simultaneously providing internal support for the thin-shell structure, achieving full-surface correction of the support. This provides a valuable reference for heat treatment correction methods for this type of hollow thin-walled structure.

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.

Systems and methods for elastically foldable structures comprising a platform with defining at least two lines dividing the platform into a plurality of portions, each portion comprises a plurality of elastically foldable strips with at least one connector connecting two adjacent strips in a portion, at least one strip of stretchable material positioned along and on top of each of the at least two lines, and a boom positioned along and under each of the at least two lines are described. The high-strain composite thin-shell structures offer high stiffness to mass ratio and increased packaging efficiency, with the additional advantage that their deployment is aided by releasing the strain energy stored in the elastic folds in a controlled quasistatic manner.

The invention belongs to the related technical field of structure optimization, and discloses a design method of a fiber reinforced composite shell structure based on full-scale isogeometric topological optimization, which comprises the following steps: (1) constructing a geometric model of a thin shell structure in a free shape by adopting a plurality of NURBS (Non-Uniform Rational B-Spline) patches; (2) respectively defining two groups of discrete design variables at NURBS surface patch control points, correlating the elasticity modulus of the composite material and each design variable in a design domain by adopting a multi-material interpolation formula based on a density method, and simultaneously applying composite material global volume constraint and fiber local volume constraint, constructing a full-scale isogeometric topological optimization model for the fiber reinforced composite shell structure; and (3) carrying out iterative optimization on the full-scale isogeometric topology optimization model to obtain a final design variable, and reconstructing the fiber reinforced composite shell structure based on the obtained final design variable, thereby obtaining the finally optimized fiber reinforced composite shell structure. According to the method, the fiber path continuity and the high design freedom degree are both considered.

The application discloses a complex-structure heat exchange device and an additive manufacturing method thereof, which comprises a hemispherical base in a cavity structure, wherein the lower end of the hemispherical base is provided with a cold water inlet, and the upper end of the hemispherical base is provided with a plurality of water outlet channels; the upper end of the hemispherical base is connected with a hollow columnar thin shell structure, the side wall of the hollow columnar thin shell structure is provided with a to-be-cooled liquid inlet and a to-be-cooled liquid outlet in directions away from each other at the upper and lower ends; the upper end of the hollow columnar thin shell structure is connected with a hemispherical top cover in a cavity structure, the upper end of the hemispherical top cover is provided with a hot water outlet, and the lower end of the hemispherical top cover is provided with a plurality of water inlets; a multi-stage branch structure flow channel combination is arranged in the hollow columnar thin shell structure after arraying, the water inlets of the multi-stage branch structure flow channel combination are communicated with the water outlet channels on the hemispherical base, and the water outlets of the multi-stage branch structure flow channel combination are communicated with the water inlets on the hemispherical top cover.

This invention discloses a multi-curved formwork system and its construction method for thin-shell concrete structures. The multi-curved formwork system includes an adjustable multi-curved formwork for adapting to the curved surface of the thin-shell concrete structure to be poured; a vertical frame supported between the ground and the adjustable multi-curved formwork; and multiple adjusting screw assemblies positioned between the ground and the adjustable multi-curved formwork, each of which can adjust the curved shape of the adjustable multi-curved formwork according to its length extension and contraction. This invention avoids problems such as grout leakage and formwork bursting.

The invention relates to a test device, a test piece applied to the test device and a test method. The test device is used for carrying out a fatigue test on a circumferential weld of a cylindrical test piece, and comprises a first support; the first adapter disc is in an annular disc shape, the radial inner end of the first adapter disc is fixed to the first support, the radial outer end of the first adapter disc is used for fixing the axial first end of the test piece in the circumferential direction so that the test piece and the first adapter disc can be coaxial, and the test piece is provided with an annular welding seam surrounding the circumferential direction by a circle; and the fatigue applying mechanism is used for applying a fatigue effect on the circumferential weld of the test piece. According to the fatigue test device suitable for the thin-wall annular structure, the fatigue mode of the annular weld joint of the thin-shell structure under the action of various loads can be effectively simulated, and effective verification of the annular welding technology in application is achieved. Working conditions can be fully simulated, and the design verification efficiency can be improved. The service life of the annular welding seam is checked, and effective support is provided for application of the annular welding technology in products such as engines.