Continuum body frequency constraint topological optimization design method considering damage-safety

A technology of frequency constraints and topology optimization, applied in design optimization/simulation, geometric CAD, etc., can solve problems such as destruction and catastrophe, and achieve the effects of increasing redundancy, reducing sensitivity, strengthening theoretical significance and application value

Pending Publication Date: 2020-06-09
BEIJING UNIV OF TECH
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Problems solved by technology

The result of traditional frequency topology optimization is similar to the skeleton structure. Although this topology maximizes the utilization rate of materials under the condition of...

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  • Continuum body frequency constraint topological optimization design method considering damage-safety
  • Continuum body frequency constraint topological optimization design method considering damage-safety
  • Continuum body frequency constraint topological optimization design method considering damage-safety

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Embodiment Construction

[0021] Such as figure 1 As shown, the present invention provides a kind of continuum frequency constrained topology optimization design method considering the damage-safety condition, and the specific solution is as follows:

[0022] The first step is to determine the base structure of the continuum and establish a finite element model:

[0023] First, based on the design requirements, determine the maximum design boundary of the continuum structure to be optimized, that is, determine the base structure, and determine the damaged design domain and non-damaged design domain according to certain performance requirements; secondly, based on the MSC.Patran software platform, establish the base structure Geometric model and finite element mesh division; finally, define material, assign unit properties, and impose boundary conditions; finally, set modal analysis output options.

[0024] The second step is to determine the number of damage cases, and input the initial damage area ce...

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Abstract

The invention discloses a continuum frequency constraint topological optimization design method considering damage-safety. The continuum frequency constraint topological optimization design method comprises the following steps: firstly, establishing a finite element model based on a continuum-based structure; determining a damage working condition number, and inputting an initial damage area center coordinate value and a damage area parameter; inputting frequency constraint optimization parameters to form a frequency constraint optimization model considering damage-safety conditions; sequentially carrying out modal analysis on the damage-safety structure containing the damage working condition, and extracting a modal analysis result of the damage condition of each structure; establishing an approximate continuous mathematical optimization column formula of the topological optimization model considering the frequency constraint under the damage-safety condition; solving the optimizationmodel by adopting a mathematical programming algorithm; and performing inversion processing on the optimal topological configuration to obtain the optimal topological configuration and the fundamental frequency of the optimal configuration. According to the method, the redundancy of the structure can be obviously improved, and a reference is provided for considering the topological optimization problem of damage-safety in the field of dynamics.

Description

technical field [0001] The invention belongs to the technical field of engineering structure design, and in particular relates to a frequency-constrained topological optimization design method of a continuum under damage-safety conditions. Background technique [0002] Topology optimization is to seek the best force transmission path of the structure with the material distribution as the optimization object under the given external load and boundary conditions. This optimization method is gradually developed with the rapid development of finite element theory and computer software technology. . Compared with size optimization and shape optimization, structural topology optimization can determine more design parameters, save materials more significantly, and achieve greater economic benefits. At the same time, it can provide engineering designers with a comprehensive It is very attractive to engineering designers to apply the optimal scheme to the layout of the structure. ...

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Application Information

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IPC IPC(8): G06F30/23G06F30/17
Inventor 杜家政孟凡伟汤威张颖
Owner BEIJING UNIV OF TECH
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