Active control method for inducting thin-walled pipe fitting to absorb energy

An active control, thin-walled technology, used in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as non-compact mode, and achieve improved energy absorption capacity, improved impact average force, and constant buffering force. Effect

Active Publication Date: 2017-12-08
CENT SOUTH UNIV
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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 materi...

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  • Active control method for inducting thin-walled pipe fitting to absorb energy
  • Active control method for inducting thin-walled pipe fitting to absorb energy
  • Active control method for inducting thin-walled pipe fitting to absorb energy

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Embodiment 1

[0037] This embodiment discloses an active control method for inducing energy absorption of thin-walled pipes, so as to use structural modal analysis to obtain the high-order axial sinusoidal buckling mode shape of the structure, and set constrained diaphragms at the nodes of the buckling mode (And in the specific setting, a mode node has and only has one diaphragm), reduce the length of a single plastic hinge, increase the number of plastic hinges, and increase the average impact force, thereby maximally improving the energy absorption capacity of the structure

[0038] Taking the thin-walled square tube as an example, the method in this embodiment specifically includes:

[0039] The first step is to obtain the structural parameters of the thin-walled square tube to be analyzed; the structural parameters include side length b, wall thickness t, and total length L.

[0040] The second step is to predict the number of telescopic buckling folds N of the thin-walled square tube u...

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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...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23G06F2119/06
Inventor 姚曙光许平肖娴靓彭勇鲁寨军闫凯波陆思思车全伟
Owner CENT SOUTH UNIV
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