Energy absorption structure optimization method taking expected force response process as target

Abstract

The invention discloses an energy absorption structure optimization method taking an expected force response process as a target, and the method comprises the steps: setting a proper expected force response curve, continuously updating the value of a target function in an optimization process in an iteration mode so as to obtain a new finite element model, and enabling an actual force response curve of a structure to be gradually close to the expected force response curve. And the energy absorption capacity of the structure is improved. According to the method, the deformation mode of the thin-walled tube can be changed, low-energy-absorption Euler deformation is changed into high-energy-absorption progressive buckling deformation, and multiple energy absorption evaluation indexes can be improved at the same time. The optimized actual force response curve of the thin-walled tube is closer to the expected force response curve. The energy absorption component obtained through the methodcan generate an ideal deformation mode, more impact kinetic energy is dissipated, and great guiding significance is achieved for design of energy absorption 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...

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

Images