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An automobile bumper mask size optimization method based on an equivalent static load method

A technology for automobile bumpers and static loads, applied in the automotive field, can solve problems such as dynamic nonlinearity

Active Publication Date: 2019-05-07
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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  • An automobile bumper mask size optimization method based on an equivalent static load method
  • An automobile bumper mask size optimization method based on an equivalent static load method
  • An automobile bumper mask size optimization method based on an equivalent static load method

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Embodiment Construction

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

[0032] In finite element theory, the governing equations for structural dynamic nonlinear analysis are:

[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 indicates the time step, q is the total time step, and f(t) indicates the external load at the tth time step.

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

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Abstract

The invention belongs to the technical field of automobiles, and particularly relates to an automobile bumper mask size optimization method based on an equivalent static load method. According to themethod, the total mass of the automobile bumper mask is taken as an objective function, displacement is taken as a constraint, and the thickness of the mask is taken as a design variable to carry outsize optimization design on the bumper mask. According to the method, a final optimization result is required to meet a convergence condition and a displacement constraint condition, and the optimization result is more accurate. In addition, only the equivalent static load of the time step with the maximum displacement is calculated, the equivalent static load of all the time steps does not need to be calculated, and the calculation efficiency is high. All the functions are integrated through matlab, automatic solving is achieved, besides basic model preprocessing, finite element software doesnot need to be opened any more to solve the model, a running program directly calls a related solver to solve the model, and operation is convenient.

Description

technical field [0001] The invention belongs to the technical field of automobiles, in particular to an automobile bumper mask size optimization method based on an equivalent static load method. Background technique [0002] In the traditional structural optimization design, the static linear optimization design has developed relatively maturely, but the loads borne by many mechanical structures in life are dynamic, and the structure itself may have nonlinear characteristics, and 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 the low-speed collision of a car bumper. During the collision, the load on the structure has dynamic char...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCY02T90/00
Inventor 马天飞王方泉任春
Owner JILIN UNIV
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