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A Boundary Simulation Method for Finite Element Model of Multi-bar System Structure

A simulation method and finite element technology, applied in the field of finite element application, can solve problems such as long calculation time, influence of result accuracy, large overall model scale, etc., to achieve the effect of saving time and resources, high accuracy of results, and simple thinking

Active Publication Date: 2021-05-25
XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there are generally only two boundary condition simulation methods for structural modeling: one uses rigid support and assumes that the boundary stiffness of the structure is infinite. This boundary simulation method is simple and easy to implement, but the influence of the support structure stiffness is not considered in the analysis. Result accuracy will suffer
The other is to use the overall model for calculation and analysis, and assemble the structure and its supporting structure model. This method has high accuracy, but the overall model is large in scale and takes a long time to calculate.

Method used

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  • A Boundary Simulation Method for Finite Element Model of Multi-bar System Structure
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  • A Boundary Simulation Method for Finite Element Model of Multi-bar System Structure

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Embodiment 1

[0026] Such as figure 1 Shown is the flow chart of the finite element model boundary simulation method of multi-bar system structure of the present invention, and the finite element model boundary simulation method of multi-bar system structure of the present invention generally comprises the following four steps:

[0027] Step 1: Determine the supporting boundary stiffness matrix by analyzing the force transmission between the structure and its supporting structure;

[0028] Step 2: Calculate the boundary flexibility matrix B through the supporting boundary stiffness matrix;

[0029] Step 3: Calculate the stiffness matrix A according to the flexibility matrix B of the structure;

[0030] Step 4: Use the finite element modeling tool to simulate the stiffness matrix A, thereby simulating the boundary conditions of the structure.

[0031] figure 2 It is a schematic diagram of a finite element model of a multi-bar system structure according to an embodiment of the present inv...

Embodiment 2

[0046] Such as figure 1 Shown is the flow chart of the finite element model boundary simulation method of multi-bar system structure of the present invention, the finite element model boundary simulation method of the present invention generally comprises the following four steps:

[0047] Step 1: Determine the supporting boundary stiffness matrix by analyzing the force transmission between the structure and its supporting structure;

[0048] Step 2: Calculate the boundary flexibility matrix B through the supporting boundary stiffness matrix;

[0049] Step 3: Calculate the stiffness matrix A according to the flexibility matrix B of the structure;

[0050] Step 4: Use the finite element modeling tool to simulate the stiffness matrix A, thereby simulating the boundary conditions of the structure.

[0051] Figure 5 It is an overall finite element model of an engine and engine frame according to another embodiment of the present invention. The black elements in the figure cons...

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Abstract

The invention relates to a method for simulating the boundary of a finite element model of a multi-bar system structure, which includes: step 1: determining the scale of the support boundary stiffness matrix by analyzing the force transmission between the body structure and its support structure; step 2: obtaining the boundary through the support boundary stiffness matrix The flexibility matrix B; Step 3: Calculate the stiffness matrix A according to the flexibility matrix B of the structure; Step 4: Use the finite element modeling tool to simulate the stiffness matrix A of the structure, thereby simulating the boundary conditions of the structure. The boundary simulation method of the finite element model of the multi-bar system structure of the present invention calculates the boundary stiffness matrix of the component, and uses the corresponding finite element software to simulate the boundary stiffness, thereby realizing the boundary simulation of the finite element model of the component. The method has simple ideas and high accuracy of results. Calculations need to be performed in the overall model, saving time and resources; the component boundary conditions can also be accurately simulated by this method, unlike the modeling tools used for the component and its supporting structure.

Description

technical field [0001] The invention belongs to the technical field of finite element application, and in particular relates to a boundary simulation method of a finite element model of a multi-bar system structure. Background technique [0002] Using finite element models to simulate real structures for analysis has become a routine practice in the fields of machinery and aviation. Before real products are put into production, the structural analysis of finite element models is carried out first. Appropriate or not, the diameter will affect the accuracy of the finite element analysis. [0003] At present, there are generally only two boundary condition simulation methods for structural modeling: one uses rigid support and assumes that the boundary stiffness of the structure is infinite. This boundary simulation method is simple and easy to implement, but the influence of the support structure stiffness is not considered in the analysis. Result accuracy will suffer. The ot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23
CPCG06F30/23
Inventor 王琳琳胡振杰
Owner XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA