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An optimization method for energy-absorbing structures targeting the expected force response history

An energy-absorbing structure and expected force technology, applied in the field of traffic safety, can solve the problems of irrationality, influence optimization results, poor accuracy of dynamic analysis results, etc., and achieve the effect of improving energy-absorbing capacity and improving energy-absorbing evaluation indicators.

Active Publication Date: 2022-03-15
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One is the equivalent static load method proposed in the article "Technical overview of the equivalent static loads method for non-linear static response structural optimization" published in "Structural and Multidisciplinary Optimization" by Gyung-Jin Park, which effectively reduces the amount of calculation. It is possible to use traditional optimization methods, but it is difficult for multiple static loads to be equivalent to the actual impact load conditions, and the accuracy of dynamic analysis results is poor, which affects the optimization results
The second is the hybrid cellular automata method for structural crashworthiness design in the article "Topometry optimization for crashworthiness design using hybrid cellular automata" published by Andrés Tovar in "International Journal of Vehicle Design". This method uses display dynamics analysis, The analysis results are accurate, but the "energy uniform distribution criterion" adopted is irrational, and the "area energy uniform distribution criterion" is too dependent on human prior experience, and the optimization results are uncertain

Method used

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  • An optimization method for energy-absorbing structures targeting the expected force response history
  • An optimization method for energy-absorbing structures targeting the expected force response history
  • An optimization method for energy-absorbing structures targeting the expected force response history

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Effect test

Embodiment 1

[0085] This embodiment is an energy-absorbing structure optimization method targeting the expected force response history, and the specific process is:

[0086] Step 1, establish the original finite element model of the thin-walled pipe under impact:

[0087] According to the structural characteristics of the impacted thin-walled tube and the rigid impact plate, the original finite element model of the thin-walled tube under impact is established. like figure 1 As shown, the structural characteristics of the impacted thin-walled tube and the rigid impact plate are divided into two parts, one part is a thin-walled tube with a square cross section, the side length of the thin-walled tube is 100 mm, the length is 1000 mm, and the wall thickness is 3.0 mm; the other part is a square rigid impact plate with a side length of 200mm. The rigid impingement plate is located at one end face of the thin-walled tube, and the center line in the length direction of the thin-walled tube coi...

Embodiment 2

[0139] This embodiment is an energy-absorbing structure optimization method targeting the expected force response history, and the specific process is:

[0140] Step 1, establish the original finite element model of the thin-walled pipe under impact:

[0141] According to the structural characteristics of the impacted thin-walled tube and the rigid impact plate, the original finite element model of the thin-walled tube under impact is established. like Figure 8 and Figure 9 As shown, the structural characteristics of the impacted thin-walled tube and the rigid impact plate are divided into two parts, one part is a thin-walled tube with a square cross section, the side length of the thin-walled tube is 100 mm, the length is 1000 mm, and the wall thickness is 3.0 mm; the other part is a rectangular rigid impact plate located at one end of the thin-walled tube, the impact plate is 880mm long and 400mm wide.

[0142] The thin-walled tube is located at one end of the rigid imp...

Embodiment 3

[0190] This embodiment is an energy-absorbing structure optimization method targeting the expected force response history, and the specific process is:

[0191] Step 1, establish the original finite element model of the thin-walled pipe under impact:

[0192] According to the structural characteristics of the impacted thin-walled tube and the rigid impact plate, the original finite element model of the thin-walled tube under impact is established. like Figure 8 and Figure 9 As shown, the structural characteristics of the impacted thin-walled tube and the rigid impact plate are divided into two parts, one part is a thin-walled tube with a square cross section, the side length of the thin-walled tube is 100 mm, the length is 1000 mm, and the wall thickness is 3.0 mm; the other part is a rectangular rigid impact plate located at one end of the thin-walled tube, the impact plate is 880mm long and 400mm wide.

[0193] The thin-walled tube is located at one end of the rigid imp...

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Abstract

An energy-absorbing structure optimization method that targets the expected force response history. By setting an appropriate expected force response curve and continuously updating the value of the objective function of the optimization process in an iterative manner to obtain a new finite element model, it can make the structural The actual force response curve gradually approaches the expected force response curve, which improves the energy absorption capacity of the structure. The invention not only can change the deformation mode of the thin-walled pipe from Euler deformation with low energy absorption to progressive buckling deformation with high energy absorption, but also can simultaneously improve multiple energy absorption evaluation indexes. The actual force response curve of the optimized thin-walled tube is closer to the expected force response curve. The energy-absorbing component obtained by using the invention can produce an ideal deformation mode, dissipate more impact kinetic energy, and has great guiding significance for the design of energy-absorbing devices of various vehicles.

Description

technical field [0001] The invention belongs to the technical field of traffic safety, and in particular relates to an energy-absorbing structure optimization method aiming at an expected force response course. Background technique [0002] Safety is the most basic requirement in the design process of vehicles. In recent years, with the development of the transportation industry, collision accidents have become a prominent problem affecting the safety of passengers. Thin-walled metal structures are widely used in energy-absorbing structures in the automotive and aerospace industries due to their light weight, manufacturability, and good impact resistance. When a vehicle or aircraft collides, the energy-absorbing structure absorbs the impact energy through plastic deformation to maximize the safety of the occupants. The energy absorption capacity of thin-walled metal structures is closely related to its deformation mode. The ideal deformation mode is progressive buckling, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23G06F30/15G06F30/17G06F111/06G06F119/14
CPCG06F30/23G06F30/15G06F30/17G06F2119/14G06F2111/06
Inventor 安伟刚王世根韩煦
Owner NORTHWESTERN POLYTECHNICAL UNIV
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