Particle damping structure vibration response estimating method based on gas-solid two-phase flow theory

A particle damping and structural vibration technology, applied in the field of shock and noise reduction

Inactive Publication Date: 2014-02-05
XI AN JIAOTONG UNIV
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Problems solved by technology

[0009] The purpose of the present invention is to provide a method for predicting the response of particle damping structures based on gas-solid two-phase flow theory. Harmonic Radiation Response Prediction Problem

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  • Particle damping structure vibration response estimating method based on gas-solid two-phase flow theory
  • Particle damping structure vibration response estimating method based on gas-solid two-phase flow theory
  • Particle damping structure vibration response estimating method based on gas-solid two-phase flow theory

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Embodiment Construction

[0038] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0039] 1. The method for predicting the response of particle damping structures based on gas-solid two-phase flow theory provided by the present invention includes the following steps:

[0040] 1) The energy dissipation mechanism of particle damping includes the friction and collision between particles and the cavity wall and the friction and collision between particles. From the perspective of energy dissipation, the present invention only considers the interaction between particles and ignores the interaction between particles and cavity walls. This is because the DEM simulation found that although the interaction between the particles and the cavity wall has a great effect on energy transfer, the energy dissipated by the interaction between the particles and the cavity wall is very small.

[0041] Therefore, the present invention collects the density ρ of...

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Abstract

Disclosed is a particle damping structure vibration response estimating method based on the gas-solid two-phase flow theory. The method includes firstly acquiring the density and diameter of particle material, and measuring a coefficient of restitution to acquire the equivalent viscosity of collisions among particles and the equivalent viscosity of frictions among the particles; then utilizing the equivalent viscosity of the collisions among the particles and the equivalent viscosity of the frictions among the particles to acquire the viscosity of the gas-solid mixed flow in a particle damping structure; acquiring the cross section area of a particle damper, and utilizing the viscosity of the gas-solid mixed flow and a velocity amplitude value of a point, to be measured, of the particle damping structure to obtain an equivalent damping coefficient of the collision and friction effect among the particles in the particle damper; setting parameters in finite element software COMSOL Multiphysics, performing simulating response estimation on the particle damping structure, and optimizing the particle damping structure in a guided manner according to estimating results. The method is simple, is adaptable to analysis of complex shell or box structure problems, and can provide a solution to the problems of vibration and acoustic radiation response estimation of the particle damping structure.

Description

Contents of the invention [0001] The invention belongs to the field of vibration reduction and noise reduction, in particular a particle damping structure response prediction method based on gas-solid two-phase flow theory. Background technique [0002] As a commonly used vibration and noise reduction technology, damping technology has always been a research hotspot in the field of structure-acoustic vibration control. Among them, the traditional damping technology represented by viscoelastic damping technology has the advantages of excellent vibration reduction effect and easy implementation. In the past ten years, it has been greatly developed and widely used. However, because the damping characteristics of the viscoelastic damping material are extremely sensitive to temperature and are prone to aging, and the additional weight of the viscoelastic damping structure is heavy when used in a large area, this technology is suitable for those who often work at low temperature, ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00G06F17/50
Inventor 王东强杨瑞超吴成军王建永
Owner XI AN JIAOTONG UNIV
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