Active control method for inducing energy absorption of thin-walled pipe fittings

Abstract

The invention relates to the technical field of structure modal analysis, and discloses an active control method for inducting a thin-walled pipe fitting to absorb energy in order to improve the energy-absorbing capability of an energy-absorbing structure and ensure a stable deformation mode. The active control method comprises acquiring a structure parameter of a thin-walled square pipe to be analyzed; predicting the number of telescoping buckling wrinkles of the thin-walled square pipe under the action of an impact load according to the structure parameter, and calculating the mean force of the thin-walled square pipe when the thin-walled square pipe generates telescoping deformation, the half wave length of an effective plastic hinge and original energy absorption; establishing a finite element model of the thin-walled square pipe, carrying out finite element modal analysis on the thin-walled square pipe, and determining the number of additionally-installed separator plates according to a convergence formula of the number of the additionally-installed separator plates and expected energy absorption; then respectively arranging the additionally-installed separator plates on corresponding vibration mode nodes of a vibration mode graph of a selected higher-order sine buckling mode; establishing a square pipe impact dynamics simulation calculation mechanical model for the improved structure with the additionally-installed separator plates, carrying out simulation analysis, and comparing the previous energy-absorbing characteristic with the optimized energy-absorbing characteristic.

Description

technical field [0001] The invention relates to the technical field of structural mode analysis, in particular to an active control method for inducing energy absorption of thin-walled pipe fittings. Background technique [0002] Traffic collision accidents seriously threaten the safety of people's lives and properties. The use of buffer energy-absorbing devices for passive safety protection has become an important measure. Metal thin-walled pipes buckle and deform under axial compression to absorb impact kinetic energy and are widely used in energy-absorbing devices. However, the deformation mode of thin-walled pipe fittings is affected by the geometric dimensions of the structure, initial conditions, boundary conditions, and material properties, and the generation of deformation modes is random. Under different speed conditions, the same thin-walled square tube may produce compact or non-compact modes. Therefore, in order to optimize the energy-absorbing characteristics of...

AI Technical Summary

Problems solved by technology

However, the deformation mode of thin-walled pipe fittings is affected by the geometric dimensions of the structure, initial conditions, boundary conditions, and material properties, and the generation of deformation modes is random. Under different speed conditions, the same thin-walled square tube may produce compact or non-compact modes.

Images