17 results about "Shell element" patented technology

The application belongs to the technical field of electric data processing, and particularly relates to a nonlinear unit construction method based on dimension expansion. The shell unit nodes are classified and information is stored; the normal of the shell unit is calculated; new nodes are expanded on the positive and negative sides along the normal according to the thickness, and corresponding three-dimensional solid units are generated; the junctions at the unit connections are specially processed to maintain the connectivity; and the original constraint conditions are converted and applied to the expanded new nodes. The method significantly improves the calculation accuracy and boundary adaptability, greatly reduces the development complexity of the nonlinear unit, and facilitates the direct coupling analysis of beams, shells, solids and other units in a unified three-dimensional system.

The application discloses a structure nonlinear deformation reconstruction method and system based on isogeometric and reduced basis, and the method comprises the following steps: measuring initial strain data of a ship plate structure surface, constructing a plurality of four-node inverse shell elements of the ship plate based on the initial strain data; assembling the plurality of four-node inverse shell elements to obtain a whole stiffness matrix; reconstructing the whole stiffness matrix based on the measured strain data of the ship plate to obtain a linear reconstruction result of the ship plate; correcting the linear reconstruction result based on the reduced basis, and fusing the correction increment to the linear reconstruction result for nonlinear iteration to complete nonlinear deformation reconstruction. On the basis of the principle of isogeometric analysis, the application combines the inverse finite element method to establish a four-node inverse shell element, realizes high-precision ship structure displacement reconstruction through a small number of strain measuring points, and helps designers to intuitively understand and deeply understand the mechanical properties of the structure and to monitor the safety of the structure in real time.

The invention relates to a wall component (10) for producing a wall and / or a terrace support. The wall component (10) comprises a first plate-type shell element (12) and a second plate-type shell element (14), which is arranged opposite the first shell element (12), wherein the first shell element (12) and the second shell element (14) are connected by at least one reinforcing element (20) and wherein the first shell element (12) and the second shell element (14) are spaced apart from one another such that an interspace (18) for concrete material is formed between the first shell element (12) and the second shell element (14). Furthermore, the wall component (10) comprises a third shell element (16), which is concave at least in some sections and which connects the first shell element (12) and the second shell element (14) at each end such that a portion of the intermediate space (18) is delimited on five sides by means of the first shell element (12), the second shell element (14) and the third shell element (16). The invention also relates to a method for erecting a wall and / or a terrace support.

The invention discloses a finite element shell element model modeling method and system considering metal surface corrosion random morphology. The method comprises the following steps: obtaining metal surface corrosion morphology three-dimensional point cloud data of a corroded component through three-dimensional laser scanning; performing dimension reduction on the three-dimensional point cloud data, judging whether the corrosion form of the metal surface is uniform corrosion or not, if so, calculating a physical regression equation based on the expanded point cloud data, and constructing a corrosion random morphology model based on superposition of a corresponding uniform corrosion depth on a corrosion texture generating a corresponding weight loss ratio; if not, constructing a corrosion random morphology model based on the learned corrosion texture; generating a corrosion morphology by using the corrosion random morphology model; performing regular grid division and numbering operation on the corrosion random morphology model; material attribute endowing is completed based on grid partitioning and numbering, and grid encryption division is carried out; and based on the shell element geometric model with the given thickness, parameter setting is completed, and a finite element shell element model is obtained.

The invention relates to a storage system (1) for storing a fluid medium, preferably hydrogen, comprising at least one tank vessel (200) which has a cylindrical basic shape and has two ends (202) for storing fluid medium, in particular hydrogen, wherein the tank vessel (200) comprises: a first shell element (10), which first shell element (10) forms a tank-vessel interior (201); a second shell element (12), which second shell element (12) surrounds the first shell element (10); and an end cap element (18) at each of the ends (202). The end cap element (18) receives the first shell element (10) and the second shell element (12) at the ends (202) of the tank vessel (202). Furthermore, the first shell element (10) is fully inserted into the second shell element (12) and into the end cap element (18), and is fixed therein. The invention also relates to a method for the pressure-tight assembly of the storage system (1).

This invention discloses a method for identifying dynamic loads on structures based on dynamic displacement inversion and motion control equations. The method includes: dividing the structure under test into several four-node inverse shell elements; deploying sensors at the centroid positions of the upper and lower surfaces of each element; reconstructing the displacement values ​​of each element node based on the collected strain data; predicting the displacement values ​​at any position of the structure under test using a high-resolution spatial domain reconstruction algorithm based on the reconstructed displacement values ​​of each element node; discretizing the fourth-order spatial deflection derivative of the displacement field of the structure under test using the finite difference method; approximating the second-order derivative of the strain data using the second-order central difference method to obtain the higher-order spatiotemporal deflection derivative; and establishing a model of the relationship between the dynamic displacement and load distribution of the structure under test by combining the motion control equations of the structure under test, thereby achieving dynamic load identification of the structure under test. Given the known geometry and material properties of the structure, this method can not only reconstruct the time history of the dynamic loads on the structure but also simultaneously identify the load application positions.

The invention relates to an air guide element (100) for a ventilation system of a vehicle headlight, comprising at least one component body (1) with at least one internal air guide channel, wherein the component body (1) is designed as a composite of at least two shell elements (11, 12). According to the invention, the shell elements (11, 12) are manufactured from a foamed plastic by thermoforming.

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 discloses a method for assessing the critical safety of a fuel transport container in a drop accident. First, the fuel transport container is geometrically modeled and meshed with an unstructured mesh. Then, a drop accident simulation is performed on this mesh model using explicit dynamic analysis software. After the simulation, the position and size information of the shell elements generated by deformation are extracted, and a corresponding solid element unstructured mesh model is rebuilt based on this information. This model is then meshed and integrated. Finally, a Monte Carlo particle transport simulation is performed to calculate the criticality, obtaining the effective multiplication factor. According to the "Regulations for the Safe Transport of Radioactive Materials," the effective multiplication factor is converted into a critical safety index, thus completing the safety assessment. This invention effectively solves the geometric compatibility problem in nuclear force coupling calculations by converting shell elements generated in the mechanical simulation that are unrecognizable by the Monte Carlo program into solid elements, reducing the simulation burden while ensuring computational accuracy.

The invention belongs to the technical field of electric data processing, and particularly relates to a nonlinear unit construction method based on dimension expansion, which comprises the following steps: classifying shell unit nodes and storing information; calculating the normal direction of the shell unit; new nodes are expanded along the positive and negative sides in the normal direction according to the thickness, and corresponding three-dimensional entity units are generated; specially processing junctions at the connection of the units to maintain connectivity; and original constraint conditions are converted and applied to the expanded new nodes. According to the method, the calculation precision and the boundary adaptability are remarkably improved, the development complexity of nonlinear units is greatly reduced, and direct coupling analysis of multiple units such as beams, shells and entities in a unified three-dimensional system is conveniently achieved.

This invention discloses a method for calculating the energy release rate of delamination damage propagation in composite materials based on shell elements, belonging to the field of composite material delamination damage modeling and efficient energy release rate calculation. The method includes: deriving an equivalent energy release rate calculation method based on energy differential, and proposing a simplified formula for calculating the structural energy release rate under the linear elasticity assumption of the material. Undamaged regions are established using multi-layered plate and shell elements after delamination, and structural damage analysis models are constructed under different damage sizes, structural load conditions, and displacement boundary conditions. The structural response under different damage sizes is calculated and a database is formed. The relationship between damage size and structural strain energy or overall flexibility and stiffness is fitted using a polynomial isofunction fitting method, establishing a reduced-order model for calculating the energy release rate of delamination damage propagation with damage size and external load as inputs. This invention is used to quickly calculate the energy release rate of delamination damage propagation in composite materials, supporting rapid online safety assessment of composite structures.

The present disclosure provides a mechanics calculation method and apparatus for a pipeline. The method includes: generating a pipe-beam model formed by connecting a plurality of pipe-beam elements; generating a target shell component mesh model formed by joining a plurality of shell elements; replacing, with the target shell component mesh model, a pipe-beam element at a corresponding position in the pipe-beam model to form a hybrid model; performing finite element calculation on the hybrid model to obtain a displacement of each node of the hybrid model; calculating nodal internal forces of the pipe-beam elements based on nodal displacements of the pipe-beam elements; calculating stresses of the respective shell elements based on mesh nodal displacements of the target shell component mesh model; and calculating stresses of the pipe-beam elements based on the nodal internal forces of the pipe-beam elements.

The present application relates to the field of aircraft structure fatigue analysis, in order to realize the fatigue life prediction of nose frame structure under multi-axial load combination, the method and the method for establishing the prediction model of nose frame structure fatigue failure are provided, the entity finite element model of frame vulnerable part is established, the shell element in the fine finite element model is replaced, and the shell-solid coupling model with calculation precision and calculation efficiency is formed;Then all the element internal integration points life exceeds the material life in the next step calculation unit is deleted, to simulate the material fatigue progressive damage, and the inflection point on the combined load analysis step failure unit quantity corresponding relation curve is taken as the nose frame structure fatigue failure criterion;The axial force and bending moment of the nose frame are taken as the independent variable, and the corresponding fatigue life is taken as the dependent variable, and the power function form of the nose frame life expression is fitted, the fatigue life prediction of the nose frame structure under multi-axial load combination is realized, and the calculation efficiency is high.

This invention discloses a method for optimizing the structural parameters of a rotating gear component with an additional damping ring. Based on the structural parameters of the driving and driven gears, models of the driving and driven gears and the damping ring are constructed using shell elements and semi-analytical continuums. The driving and driven gear models are coupled together using rotating meshing elements that consider the rotating meshing effect, resulting in a gear system model. The damping ring is coupled with the driving gear model by considering the axial friction force between the damping ring and the gear rim, resulting in a system model with the additional damping ring. Based on this system model, a genetic algorithm is used to optimize the design parameters of the damping ring. The rotating meshing elements effectively induce axial traveling wave resonance in the gear, and the characteristics of the continuum elements are used to consider the relative motion between the damping ring and the gear at different positions, thus more realistically simulating the frictional vibration reduction process of the damping ring and significantly improving the vibration reduction performance of the designed damping ring.

1. Name of the product in this design: Chandelier (shellfish element). 2. Purpose of this design: for indoor lighting. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the key design points: Design 1 3D view. 5. The top views of Design 1 and Design 2 of this product are for parts that are not easily seen or cannot be seen during use, so the top views of Design 1 and Design 2 are omitted. 6. Design 1 is designated as the basic design.

The application discloses a kind of composite aircraft structure modeling method and equipment, belong to aircraft structure computer aided engineering modeling technical field, to solve the problem of low precision, modification is complicated, the low efficiency of existing modeling method.The method comprises: constructing the two-dimensional geometric topology of aircraft component and shell element grid;According to the relative position relationship of structure, set the unit normal topology of component shell element;According to this topology, construct the lay-up sequence topology;Based on lay-up sequence topology, generate the standardized full-machine lay-up data table containing lay-up name, sequence, angle, thickness and unit set identification;Finally, the data table is input into CAE software, and the full-machine composite structure lay-up model is automatically generated.The application realizes high-precision expression and rapid global modification of model by combining topology definition with data table, significantly improves the efficiency and iteration speed of composite aircraft structure design analysis.

The application discloses a tensile-bending stiffness decoupling method in fiber preform die forming simulation, and relates to the technical field of simulation learning, and comprises the following steps: a macro finite element model composed of triangular shell elements is established; a biorthogonal fiber coordinate system aligned with the yarn direction is established in each element. Tensile, shear and bending stiffness changing with deformation state are obtained and a constitutive equation is constructed. In the element, an in-plane model controlled by tensile and shear stiffness and an out-of-plane model independently controlled by bending stiffness are respectively established to realize stiffness decoupling. In each increment step, the biorthogonal coordinate system is updated according to the deformation gradient, and after stress is calculated in the biorthogonal coordinate system based on the constitutive equation, the stress is converted to the global coordinate system. Finally, boundary conditions are applied for numerical solution to obtain deformation field, stress and strain distribution and fiber orientation evolution results. The application decouples tensile stiffness and bending stiffness, and eliminates false stiffness in a traditional model.