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A method for optimizing the size of automobile bumper mask based on the equivalent static load method

A technology of automobile bumper and static load, which is applied in the field of automobiles and can solve problems such as dynamic nonlinearity

Active Publication Date: 2022-07-05
JILIN UNIV
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Problems solved by technology

[0004] The invention provides a method for optimizing the size of an automobile bumper face shield based on the equivalent static load method, which can effectively solve the dynamic nonlinear problem of the plate during the size optimization process considering the collision safety

Method used

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  • A method for optimizing the size of automobile bumper mask based on the equivalent static load method
  • A method for optimizing the size of automobile bumper mask based on the equivalent static load method
  • A method for optimizing the size of automobile bumper mask based on the equivalent static load method

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Embodiment Construction

[0031] The basic principle of equivalent static load is as follows:

[0032] In the finite element theory, the governing equation of the dynamic nonlinear analysis of the structure is:

[0033]

[0034] where b is the design variable, representing the thickness of the bumper mask, M is the mass matrix, C is the damping matrix, K is the stiffness matrix, represents the acceleration vector, represents the velocity vector, z N (t) represents a displacement vector. The subscript N indicates that the response was obtained by nonlinear analysis. The subscript of t represents the time step, q is the total time step, and f(t) represents the external load at the t-th time step.

[0035] According to the calculation principle of the equivalent static load, the equivalent static load based on the displacement response is the static load for the static linear analysis that produces the same displacement response as the dynamic nonlinear analysis at each time step. Therefore, the...

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Abstract

The invention belongs to the technical field of automobiles, in particular to a method for optimizing the size of an automobile bumper mask based on an equivalent static load method. The invention takes the total mass of the automobile bumper mask as the objective function, the displacement as the constraint, and the thickness of the mask as the design variable to optimize the size of the bumper mask. The present invention requires that the final optimization result not only meets the convergence condition, but also needs to satisfy the displacement constraint condition, and the optimization result is more accurate. In addition, the present invention only calculates the equivalent static load of the time step where the displacement is the largest, and does not need to calculate the equivalent static load of all time steps, and the calculation efficiency is high. The invention uses matlab to integrate all the above functions to realize automatic solution. Except for basic model preprocessing, it is not necessary to open finite element software to solve the model, and the running program directly calls the relevant solver to solve, and the operation is convenient.

Description

technical field [0001] The invention belongs to the technical field of automobiles, in particular to a method for optimizing the size of an automobile bumper mask based on an equivalent static load method. Background technique [0002] In the traditional structural optimization design, the static linear optimization design is relatively mature, but the loads on many mechanical structures in life are dynamic, and the structure itself may have nonlinear characteristics. The traditional static linear optimization method is difficult to apply to this dynamic in nonlinear optimization problems. Therefore, the equivalent static load method can be used to convert the dynamic nonlinear optimization problem into a static linear optimization problem that is easier to calculate. [0003] In the field of engineering, collision is a relatively common phenomenon, such as a low-speed collision of a car bumper. During the collision, the loads on the structure have dynamic characteristics....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/15G06F30/23G06F111/06G06F111/04
CPCY02T90/00
Inventor 马天飞王方泉任春
Owner JILIN UNIV
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