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Curve fiber composite structure design multi-level optimization method

A fiber composite and structural design technology, applied in design optimization/simulation, special data processing applications, etc., can solve the problem of high computational cost

Pending Publication Date: 2021-05-18
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] The invention provides a multi-level optimization method for curved fiber composite structure design, which is used to solve the technical problem of high calculation cost existing in the existing curved fiber composite structure design optimization method

Method used

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  • Curve fiber composite structure design multi-level optimization method
  • Curve fiber composite structure design multi-level optimization method
  • Curve fiber composite structure design multi-level optimization method

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Embodiment 1

[0040] A multilevel optimization method for the design of curved fiber composite structures based on vector field interpolation without divergence, such as figure 1 As shown, it includes the following steps:

[0041] (1) Establish a parameterized hierarchy, the number of layers is m, and solve the optimization problem of the jth layer, where j=1, 2,...m. j=1 represents the coarsest layer in the hierarchical structure, and j=m represents the thinnest layer in the hierarchical structure.

[0042] (2) Evenly set a series of discrete field center points P in the composite structure design domain D of the jth layer ij (i=1,2,3,...,n j ) and a series of discrete sample points S ij (i=1,2,3,...,l j ). For each field center point P ij Assign expansion coefficient α ij , and divide the design domain D into N at layer j j finite elements (where n, l and N are positive integers). Among them, the P ij , S ij coincide with the finite element grid nodes and finite element center ...

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Abstract

The invention belongs to the field of composite structure design optimization, and discloses a curve fiber composite structure design multi-level optimization method, which comprises the following steps: establishing parameterization levels from the thickest layer to the finest layer; for each layer, uniformly arranging a series of field center points in the structure, constructing a vector field according to the field center points, giving initial vectors at the field center points, and solving initial weight coefficients at the field center points; establishing a relationship between a stiffness matrix and a design variable by utilizing finite element analysis; updating a design variable through an optimization algorithm based on sensitivity and conjugate mapping thereof to achieve the goal of the minimum structural flexibility; obtaining a solution of an optimization problem of a relatively thick layer, and further calculating a design initial value of an adjacent relatively thin layer; repeating the steps, solving the optimization problem of the finest layer, and obtaining the optimal fiber angle space continuous change layout of the curve fiber composite structure. The optimization method is combined with a parameterization format based on non-divergence vector field interpolation, design variables are reduced, the optimization efficiency is high, and meanwhile the calculation cost in the optimization process is reduced.

Description

technical field [0001] The invention belongs to the field of composite structure design optimization, and more specifically relates to a multi-level optimization method for curved fiber composite structure design. Background technique [0002] The curved fiber composite structure is an advanced composite material structure with variable stiffness, which has the advantages of high specific strength and high specific stiffness. Compared with the linear fiber composite structure, it has better mechanical properties. This structure can change the material properties by changing the angle of fiber laying, so it has strong designability. With the development of automatic fiber placement technology, it is widely used in aviation, aerospace and other fields. [0003] Usually, the design optimization of curved fiber composite structures is mainly to optimize the fiber laying angle. Among the many components of the optimization method for curved fiber composite structures, the para...

Claims

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Application Information

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IPC IPC(8): G06F30/23
CPCG06F30/23Y02T90/00
Inventor 夏奇蒲史鸣田野宗子豪史铁林
Owner HUAZHONG UNIV OF SCI & TECH
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