基于统计方法的NOPD耗能机理定量分析

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (9) : 135-139.

论文

基于统计方法的NOPD耗能机理定量分析

崔致远，吴九汇，陈花玲，李涤尘

作者信息 +

quantitative analysis on the energy dissipation mechanism of the non-obstructive particle damping technology

Cui Zhi-yuan , Wu Jiu-hui , Chen Hua-ling, Li Di-chen

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文章历史 +

摘要

非阻塞性微颗粒阻尼（NOPD）是在传统颗粒阻尼和冲击阻尼技术基础上发展起来的新型阻尼技术。本文从湍流物理模型出发，基于统计方法定量分析了NOPD技术的耗能机理。经分析认为，高频振动中的NOPD颗粒群其运动状态和湍流运动相似，故引入Kolmogorov的局部各向同性假设，得到NOPD的结构函数表达式及能谱密度表达式。研究结果表明，同种材料，相同颗粒直径情况下，能量耗散率随颗粒群体积比的增加而增大；相同颗粒群体积比时，能量耗散率随颗粒直径的增加而增大。统计方法的引入，为NOPD的工程应用提供了一种有效的定量分析方法。

Abstract

The non-obstructive particle damping (NOPD) technology has been recently developed from particle damping and impact damping technologies. In this paper, a quantitative analysis of the dissipation mechanism of NOPD based on a statistical theory is inves-tigated for the first time to our knowledge. Under high-frequency vibrations, the dense granular motion of NOPD is very similar to tur-bulence. Thus, Kolmogorov’s hypothesis in turbulence is adopted to describe the energy spectral density and velocity correlation func-tion of the particles in the NOPD technology. It is shown that the NOPD’s mean energy dissipation (per unit mass) increases with either the granular diameter or the volume ratio of the dense granular flow. The quantitative model for the NOPD technology presented in the paper should be useful in possible engineering applications of vibration reduction.

导出引用

崔致远;吴九汇;陈花玲;李涤尘. 基于统计方法的NOPD耗能机理定量分析[J]. 振动与冲击, 2012, 31(9): 135-139

Cui Zhi-yuan; Wu Jiu-hui; Chen Hua-ling; Li Di-chen. quantitative analysis on the energy dissipation mechanism of the non-obstructive particle damping technology[J]. Journal of Vibration and Shock, 2012, 31(9): 135-139