22 results about "Thin-shell structure" patented technology

The invention relates to an electric arc additive design-simulation-reinforcement-construction integration method for a curved metal thin shell, which comprises the following steps of: adopting a metal wire, and obtaining a three-dimensional structure model of a metal thin shell structure by utilizing the curved surface shape optimization design of a shell unit; simulating and predicting the deposition of the exposed thin shell structure; simulating and predicting the deposition of the reinforced thin-shell structure; and reinforcing thin-shell metal 3D printing construction. The method has the beneficial effects that the stress and deformation distribution and amplitude of the exposed thin shell structure are obtained through deposition simulation prediction with low cost, and reinforcement measures are set based on the stress and deformation distribution and amplitude, so that excessive deformation in the printing process of the electric arc additive process is avoided to a great extent, and the service life of the electric arc additive process is prolonged. Printing failure and printing repositioning caused by excessive deformation are avoided, and the forming quality and the material performance of the metal forming structural part are effectively guaranteed.

A vehicle-mounted high-frequency boost inductor with a copper sheet for auxiliary heat dissipation comprises a shell, and a framework assembly, a magnetic core assembly, a winding assembly and a heat conduction assembly are arranged in the shell. The framework assembly comprises three stand column frameworks and two end frameworks, and the three stand column frameworks and the two end frameworks are each of a thin shell structure. The three stand column frameworks are arranged in parallel in a pairwise spaced mode in the transverse direction of the shell. The two end frameworks are symmetrically arranged at the two ends of the three stand column frameworks. Accommodating cavities are formed in the three stand column frameworks; the winding assembly is wound on the framework assembly; the magnetic core assembly is arranged on the containing cavities in a sleeving mode and comprises three stand column magnetic cores arranged in the three containing cavities respectively. The upper yoke magnetic core and the lower yoke magnetic core are connected with the two ends of the stand column magnetic core respectively; the heat conduction assembly comprises a plurality of heat conduction copper sheets, the thickness of each heat conduction copper sheet is smaller than 1 mm, and the heat conduction copper sheets wrap the upper end face, the front end face and the rear end face of the upper yoke magnetic core, the lower end face, the front end face and the rear end face of the lower yoke magnetic core and the rear side face of the stand column magnetic core; and a plurality of mutually independent strip-shaped holes are formed in the heat-conducting copper sheet.

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 utility model relates to an interlayer composite steel bar truss overlapping folding shell structure, which comprises a GFRP bottom plate, a fastener, a steel bar truss, an XPS plate and a post-cast concrete layer, the GFRP bottom plate is an arc-shaped folding plate, a bending angle and a bending plane are formed on the arc-shaped folding plate, the XPS plate is fixedly adhered to the bending angle and the end part of the upper surface of the GFRP bottom plate, and the post-cast concrete layer is arranged on the GFRP bottom plate. The fasteners are arranged on the GFRP bottom plate, the steel bar trusses are fixedly connected to the fasteners and located between every two adjacent XPS plates, and the post-pouring concrete layer is poured on the GFRP bottom plate, the steel bar trusses and the XPS plates which are connected with one another on site during construction, so that the stress performance and the structural span of the structure can be remarkably improved, construction is convenient, and the construction efficiency is improved. And the construction and maintenance cost can be greatly saved, and a positive effect is achieved on popularization and development of thin-shell structures and fabricated buildings.

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.

The present invention relates to a concrete thin-shell building, comprising: a support structure; a thin-shell structure including a prestressed beam and a shell disposed on the prestressed beam, the end of the prestressed beam being lapped on the top edge of the support structure; a buffer limiting structure including a plurality of seismic isolation bearing bodies, which are distributed between the prestressed beam and the support structure, and the seismic isolation bearing bodies are respectively connected to the prestressed beam and the support structure. It can greatly reduce the adverse effects on the structure caused by the excessive self-weight of the long-span concrete thin-shell structure. In this embodiment, the high-position seismic isolation bearing is mixed with the thin-shell structure system, and large-size spatial thin-shells can be designed on large building structures, giving full play to the advantages of the large size of the thin-shell structure to form buildings with novel and peculiar shapes and adaptable to various planes; the large-area concrete thin-shell structure can transfer loads downward and form a large-range enclosure in space, thus integrating the functions of load-bearing and enclosure and maximizing the advantages of the concrete thin-shell 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.

The invention discloses a floating steel gate support with a thin shell structure, which belongs to the technical field of water conservancy and hydropower engineering and is characterized in that a floating steel gate is formed by splicing a plurality of floating steel gate sections, and a panel, a web of a main cross beam and a longitudinal beam of each floating steel gate section are in transition with variable cross sections and sizes. The multiple supports are placed on the lower sides of the variable cross sections of the panels, the main cross beam webs and the longitudinal beams of the floating steel gate segments in a lifting mode correspondingly and used for guaranteeing stable transition of the variable cross sections and the sizes of the floating steel gate segments in the butt-assembling process. According to the floating steel gate with the thin shell structure, the floating steel gate with the thin shell structure is adopted for supporting, accurate transition of the size of the variable cross-section of the gate panel is guaranteed, the flatness of the variable cross-section panel is guaranteed, and therefore when the floating steel gate with the thin shell structure is filled with water, pressure borne by the floating steel gate with the thin shell structure is more uniform, and the buoyancy stability of the gate is higher.

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.

The present invention provides an isogeometric display dynamics calculation method for solving large deformation analysis of thin-shell structures in non-conforming complex CAD models, belonging to the field of display dynamics technology. First, a CAD design model is input and its NURBS parameters are obtained. Second, the CAD design model is subjected to isogeometric display dynamics analysis of large deformation thin-shell structures. Finally, the isogeometric display dynamics calculation results are output. The present invention effectively solves the processing difficulties of complex non-conforming CAD models in isogeometric analysis and display dynamics solutions for large deformation thin-shell structures.

A drawing die for a variable-width flange basin-shaped part, its design and usage method. The basin-shaped part is a symmetric thin-shell structure with a depth-to-diameter ratio greater than 0.25, and its theoretical model contains an approximately gourd-shaped variable-width flange edge and a circular cavity basin. According to the theoretical model of the basin-shaped part, a process model with gradually changing thickness in multiple zones of the flange is designed; a drawing die with a multi-zone variable clearance fit relationship of the blank-holding surface is designed according to the process model; the drawing die of the present application is beneficial to ensure uniform pressing of each zone of the actually drawn variable-thickness flange, can reduce or even avoid repeated trial-and-error die repair, overcome the engineering application problems of variable clearance blank-holding and uneven load-bearing of large drawing dies, and has remarkable advantages such as uniform force on the flange, low thinning, small die repair workload, and simple operation.

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 discloses a calculation method for accurately predicting deformation of a cylindrical explosion vessel, which comprises the following steps of: firstly, aiming at a cylindrical thin shell structure, establishing a radial dynamic balance equation for describing the dynamic response of the cylindrical thin shell structure, obtaining a reflection pressure load model based on a simplified finite element model, and proposing a linear strengthening rigid-plastic hypothesis of a cylindrical shell material; solving the length of the deformation area by using an energy method; after displacement and bending moment boundary conditions are substituted, a theoretical calculation method capable of quantitatively predicting time domain and space domain deformation of the cylindrical explosion container is established; according to the method, a computable parameter system is provided for the design of the explosion container, a theoretical predicted value is well matched with a test result, and the theoretical blank of a traditional empirical formula under a near-field explosion working condition is filled.

The invention relates to the technical field of steel structure design, and particularly discloses a thin shell structure and a machining method thereof.The thin shell structure comprises an inner shell and an outer shell, the outer shell is arranged on the periphery of the inner shell, an inner cavity is formed between the outer shell and the inner shell, and the inner cavity is used for being filled with high-pressure content; according to the scheme, when the external load acts on the shell, the shell has the inward collapse or buckling deformation tendency, the high-pressure content filled in the inner cavity can apply outward pressure to the shell, and the outward internal pressure directly counteracts part of inward compression stress generated by the external load; on the other hand, the outer shell mainly plays a role in restraining the inner cavity, when the outer shell generates a little-inward-concave deformation trend, the size of the inner cavity is reduced, the pressure intensity of objects contained in the inner cavity is sharply increased due to reduction of the size of the inner cavity, larger outward pushing force can be generated due to increase of the pressure intensity, and therefore the inner cavity is prevented from being damaged. Compared with a traditional thickening design, the thin shell structure has the advantages that the rigidity of the whole structure can be guaranteed, and meanwhile, the burden caused by thickening is reduced.

The invention relates to the technical field of marine acoustic detection, in particular to a buried shellfish density detection nonlinear sonar system based on penetration inversion. Comprising a signal transceiving unit; a motion compensation unit; a data fusion module; a signal processing unit; a data resolving unit; and a control unit. According to the method, the spatial resolution of the shellfish micro shell structure is improved by utilizing the second harmonic, and collaborative optimization of the penetration depth and the resolution is realized; based on the characteristic that resonant frequency and reflected harmonic characteristics of a thin shell structure of a shellfish shell are distributed in a higher frequency band, a broadband nonlinear signal containing second harmonics is generated through a signal generator, and a characteristic extraction module extracts multi-dimensional nonlinear acoustic characteristics such as a ratio of second harmonic energy to fundamental wave energy, a signal phase mutation coefficient and the like; an acoustic reflection signal of the shellfish shell can be effectively excited; through the motion compensation unit, high-frequency surge disturbance in a shallow water area can be effectively dealt with.

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.