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.