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

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...

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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

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