公开(公告)号：US20200065447A1

公开(公告)日：2020-02-27

申请号：US16346513

申请日：2018-12-20

Applicant: Dalian University of Technology

Inventor： Yangjun LUO ,  Jian XING ,  Zhan KANG ,  Ming LI

IPC: G06F17/50

Abstract: A method for fixture shape optimization design of a space membrane structure for inhibiting wrinkling, and solves the problem that the space membrane structure is easy to generate a wrinkling phenomenon under the stretching effect of a traditional fixture. By optimizing the shape of the fixture and changing the loading boundary conditions, the minor principal stress of the unit in the membrane region is maximized and the distribution of the principal stress of the membrane is regulated. A global optimization algorithm is used to find a global optimal design, and then novel fixture forms with “arch” and “convex” boundaries are obtained, to achieve the purpose of completely simulating the wrinkling. The present invention not only inhibits the generation of the wrinkling in the membrane, but also avoids cutting the membrane and ensures that the membrane has large enough working area.

公开(公告)号：US20210073428A1

公开(公告)日：2021-03-11

申请号：US16757669

申请日：2019-08-12

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Yangjun LUO ,  Zhan KANG ,  Pai LIU

IPC: G06F30/10 ,  G06F30/23

Abstract: A structure topology optimization method based on material-field reduced series expansion is disclosed. A bounded material field that takes correlation into consideration is defined, the bounded material field is transmitted into a linear combination of a series of undetermined coefficients using a spectral decomposition method, these undetermined coefficients are used as design variables, an optimization model is built based on an element density interpolation model, the topology optimization problem is solved using a gradient-based or gradient-free algorithm, and then a topology configuration with clear boundaries is obtained efficiently. The method can substantially reduce the number of design variables in density method-based topology optimization, and has the natural advantage of completely avoiding the problems of mesh dependency and checkerboard patterns.

公开(公告)号：US20210141981A1

公开(公告)日：2021-05-13

申请号：US16821821

申请日：2020-03-17

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Yangjun LUO ,  Jian XING ,  Zhan KANG

IPC: G06F30/23

Abstract: A structural non-gradient topology optimization method based on a sequential Kriging surrogate model mainly comprises three parts: reduced series expansion of a material field of design domain, building of a non-gradient topology optimization model and solving optimization model using a sequential Kriging surrogate model algorithm. Design variables of the topology optimization problem are considerably reduced through the series expansion of a material-field function, and then the topology optimization problem involving fewer than 50 design variables can be effectively solved using the sequential Kriging surrogate model algorithm with an adaptive design space adjustment strategy. Without requiring the information of design sensitivity of a performance function, this method is suitable for solving complex multi-physical, multidisciplinary and highly nonlinear topology optimization problems. It not only inherits the simple form of density-based topology optimization model, but also makes the final topology clear and smooth in structural boundary.

公开(公告)号：US20190179985A1

公开(公告)日：2019-06-13

申请号：US16084053

申请日：2017-01-09

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Yangjun LUO ,  Zhan KANG ,  Ming LI

IPC: G06F17/50

Abstract: The present invention proposes a design optimization method to prevent wrinkling of stretched membrane structures. It solves the problem of membrane wrinkling in a macro structure or a graphene structure under stretching loads. The membrane material distribution is found using a topology optimization technique that generates a design with curved boundaries or inner holes to eliminate wrinkles. The stress state of a membrane is regulated by restrict the minimum principal stress of each finite-element to a positive value. Such a method guarantees that wrinkling is prevented by accurately designing the shape of boundary and the layout of holes of the membrane. The optimization procedure is highly automated, and the efficiency of the wrinkle-free design for membrane structures can be guaranteed.