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Vortex-induced vibration simulation method for elastic support rigid cylinder structure under action of nonlinear energy trap

A nonlinear energy well and elastic support technology, which is applied in design optimization/simulation, instrumentation, electrical digital data processing, etc., can solve the problems of small vibration absorption range and narrow frequency band, so as to avoid grid distortion, improve calculation accuracy, reduce The effect of the number of experiments

Pending Publication Date: 2020-02-14
YANGZHOU UNIV +2
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Problems solved by technology

Installing dampers in the column structure is also an effective way to reduce structural vibration, but conventional dampers such as frequency-modulated mass dampers and frequency-modulated liquid dampers often have a narrow frequency band and a small vibration absorption range

Method used

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  • Vortex-induced vibration simulation method for elastic support rigid cylinder structure under action of nonlinear energy trap
  • Vortex-induced vibration simulation method for elastic support rigid cylinder structure under action of nonlinear energy trap
  • Vortex-induced vibration simulation method for elastic support rigid cylinder structure under action of nonlinear energy trap

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Embodiment 1

[0040] In this embodiment, the mass m=15.708kg, the stiffness k=2530.1N / m, and the damping coefficient Diameter D=0.02m, natural frequency f n = 2Hz cylindrical structure to establish a simulation model, the dimensionless parameters of the nonlinear energy well at this time are damping ratio ξ = 0.8, stiffness ratio γ = 0.8, mass ratio β = 0.1, and its reduced wind speed Ur = 5 The characteristics of vortex-induced vibration under the action of a nonlinear energy well.

[0041]Step 1: Simplify the column structure model, ignore the axial deformation of the column structure, only consider the bending vibration deformation of the column, and use the drawing software to establish the geometric model of the column on the two-dimensional plane based on the actual column size. Then establish a two-dimensional watershed model where the column is located according to the geometric model, such as figure 2 As shown, the two-dimensional watershed is a rectangular area surrounded by t...

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Abstract

The invention provides a vortex-induced vibration simulation method for an elastic support rigid cylinder structure under the action of a nonlinear energy trap in the field of computational fluid mechanics numerical simulation. The vortex-induced vibration simulation method comprises the following steps: firstly, establishing a two-dimensional drainage basin and a geometric model of the two-degree-of-freedom elastic support rigid cylinder structure; secondly, respectively carrying out grid division on the two-dimensional drainage basin and the structural domain, and carrying out interpolationon the two sets of grids by utilizing a nested grid technology to form a flow field calculation grid; establishing a computational structural mechanics model under the action of the NES, combining thecomputational structural mechanics model with the computational fluid mechanics model, and performing cylinder fluid-solid coupling numerical calculation; and finally, carrying out post-treatment toobtain the vortex-induced vibration characteristic of the cylinder structure under the action of the NES and the inhibition effect of the NES on the vortex-induced vibration of the cylinder structure.According to the method, the vortex-induced vibration high-fidelity simulation model of the two-dimensional cylinder structure under the action of the NES is established on the basis of a computational fluid mechanics method, a structural dynamics theory and a nested grid technology, a numerical prediction result has high credibility, and reference is provided for researching cylinder vibration reduction.

Description

technical field [0001] The invention relates to a vortex-induced vibration simulation method, in particular to a vortex-induced vibration simulation method for an elastically supported rigid column structure under the action of a nonlinear energy well. Background technique [0002] In the field of wind engineering and ocean engineering, when the fluid flows through the blunt body, the vortex shedding phenomenon will alternately occur in the wake on both sides of the blunt body, thereby generating a periodically changing fluid force on the lateral direction of the structure, and the elastic structure will also generate lateral force. Vibration, this phenomenon is Vortex Induced Vibration (VIV). In reality, when fluid flows through columnar structures such as wind turbine towers, ocean Spar platforms, and towering buildings, vortex-induced vibrations will be generated, which will have a certain impact on the structure. When the frequency of vortex shedding in the wake is clos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F30/18G06F119/14
CPCY02T90/00
Inventor 陈东阳顾超杰展志焕孙振业李迺路曹久发朱卫军杨华毛拾文
Owner YANGZHOU UNIV
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