Method for optimizing contact force of structure by adopting equivalent static displacement

A technology of static displacement and contact force, applied in design optimization/simulation, special data processing applications, instruments, etc., can solve problems such as low calculation accuracy of proxy model method, difficult to deal with complex model optimization design, large amount of calculation, etc., to achieve practical Strong performance, avoiding engineering experience, and small amount of calculation

Active Publication Date: 2018-12-21
左文杰 +1
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Problems solved by technology

However, the calculation accuracy of the surrogate model method is low, and for multi-variable optimization, the calculati

Method used

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  • Method for optimizing contact force of structure by adopting equivalent static displacement
  • Method for optimizing contact force of structure by adopting equivalent static displacement
  • Method for optimizing contact force of structure by adopting equivalent static displacement

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Embodiment

[0061] The front side member of the car is the main energy absorbing member when the vehicle collides. image 3 The deformation of the front end structure under the vehicle offset collision condition is shown. In order to simplify the model, this example uses Figure 4 Rectangular tubes shown in place of front side members. The left side of the rectangular tube is fixed, and a rigid wall on the right side hits the rectangular tube along the negative X direction at a speed of 1m / s. The mass of the rigid wall is 450kg, which is used to simulate the mass of the whole vehicle. The rectangular tube grid was divided by shell elements, and the initial thickness was 2 mm. In this embodiment, the thickness of the rectangular tube is used as a design variable to optimize the maximum value of the total magnitude of the collision force received by the rigid wall. The specific optimization steps are described below.

[0062] (1) Extract the contact force

[0063] Using LS-Dyna softwar...

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Abstract

The invention relates to a method for realizing structural contact force optimization by adopting equivalent static displacement, belonging to the field of engineering structure optimization design. The main steps are as follows: firstly, the nonlinear contact analysis of the structure is carried out to obtain the contact force of the joint on the contact surface; secondly, the contact force is applied as a static external load on the node of the original contact surface, and its static displacement is calculated; finally, the static displacement is applied to the node of the contact surface as a constraint of forced displacement, and the constraint reaction force under the linear static condition is optimized. If the optimized structure meets the contact force constraint requirements, theoptimization is stopped, otherwise the above steps are repeated. The invention can rationally optimize the structure involving the contact force and avoid the structural designer from relying excessively on the sensible engineering experience. Compared with the traditional surrogate model method, this method has higher optimization accuracy and less computation, and can be applied to complex engineering problems.

Description

technical field [0001] The invention relates to the field of engineering structure optimization design, in particular to a contact force optimization method, in particular to a method for realizing structure contact force optimization by using equivalent static displacement. Background technique [0002] In order to shorten the design cycle and test cost, computer-aided finite element simulation and optimization technology has been widely used in the field of engineering structure design. However, due to the highly nonlinear contact conditions, it is very difficult to derive the sensitivity of the contact force to the design variables. At present, there is no gradient-based algorithm that can solve the contact force optimization problem. In engineering, the surrogate model method, such as the response surface method, is mostly used to deal with such problems. However, the surrogate model method has low computational accuracy and a large amount of computation for multivariab...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23G06F30/15G06F2119/06
Inventor 陈雪乾左文杰
Owner 左文杰
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