颗粒阻尼减振箍设计及其减振性能实验研究

发布时间：2018-01-15 10:26

本文关键词：颗粒阻尼减振箍设计及其减振性能实验研究　出处：《扬州大学》2014年硕士论文　论文类型：学位论文

【摘要】：大跨斜拉桥拉索由于重量轻、刚度小、阻尼低而极易发生振动,拉索的振动控制已成为国内外工程领域研究的热点问题。有效地提高拉索的阻尼是抑制拉索振动的关键。本文拟利用颗粒阻尼的增大阻尼效果显著、减振频带宽等优点,设计能在拉索上用的颗粒阻尼减振箍以提高拉索的结构阻尼,期望能在各种因素引起的拉索振动情形下均以有效地控制拉索的振动；通过对减振箍的振动实验和基于离散元理论的数值分析,对减振箍的构造以及颗粒阻尼相关参数如颗粒材料、粒径、填充率和质量比等进行分析,以获取减振箍的合理构造形式及颗粒阻尼参数的合理取值范围；通过对配置了减振箍的拉索进行自振动实验以及对拉索的颗粒阻尼模型进行数值分析,对减振箍以及颗粒阻尼参数进行优化调整；根据拉索的风雨振动和参数振动实验结果,总结减振箍的减振效果,揭示减振箍的耗能减振机理；提出减振箍的设计思路与准则。 1、单减振箍振动实验中,对于两种不同形式的减振箍即扇柱空腔减振箍和圆柱空腔减振箍,实验充分地对比了两者减振性能。圆柱空腔单减振箍对于同一振动频率和同种填充颗粒时的结构阻尼值偏大。 2、单减振箍振动实验中,在实验中其他条件都相同时,振动频率越高对应结构的阻尼值就越大。 3、在扇柱空腔双减振箍振动中,对比单减振箍实验,扇柱空腔双减振箍在三种不同振动频率下的减振性能要高于扇柱空腔单减振箍。 4、在扇柱空腔双减振箍振动中,在实验中其他条件都相同时,结构整体的阻尼值随着振动频率的提高有所增加。 5、扇柱空腔双减振箍在三种不同频率振动下,采用最小的振动频率时,-100目铁粉的对应的结构阻尼值要高于其他两种颗粒,而在较高频率振动时,细砂颗粒对结构阻尼值的增大效果最好。本研究通过针对减振箍进行振动实验,结合离散元软件模拟,设计出具有减振效果明显的减振箍构造形式以及在构件上的布置方案
[Abstract]:The cable of long-span cable-stayed bridge is easy to vibrate due to its light weight, small rigidity and low damping. The vibration control of cables has become a hot research topic in the field of engineering. Improving the damping of cables effectively is the key to restrain the vibration of cables.
This paper significantly by increasing the damping effect of particle damping, wide frequency band, particle damping hoop design can use the cable to improve the damping of cable, cable vibration can expect the situation caused by various factors in to effectively control the vibration of cables; through the vibration experiment of vibration and numerical coupling the theory of discrete element method based on the analysis of vibration band structure and particle damping parameters such as particle material, particle size, filling ratio and mass ratio are analyzed, the reasonable range of reasonable structure and particle damping parameters to obtain the numerical damping hoop; through the analysis of the configuration of the self vibration damping of the cable clamp experiment of cable and particle damping model, the adjustment and optimization of damping hoop and particle damping parameters; according to the cable wind vibration and parameter of the experimental results, the total The vibration damping effect of the damping hoop is concluded, and the mechanism of damping hoop is revealed and the design idea and criterion of the damping hoop are put forward.
1, single damping hoop vibration experiment, the vibration band for two types namely fan column cavity vibration damping hoop hoop and cylindrical cavity, experiments fully compared the damping performance of cylindrical cavity. Single damping hoop about damping in the same frequency and the same value of the filler particles is too large.
2, in the experiment of single vibration hoop, the higher the vibration frequency is, the greater the damping value of the structure.
3, in the vibration of the double damping hoop of the fan cavity, compared with the single damping hoop experiment, the damping performance of the double damper hoop at three different vibration frequencies is higher than that of the fan column cavity.
4, in the vibration of the double vibration hoop of the fan column cavity, the damping value of the whole structure increases with the increase of the vibration frequency in the experiment.
5, when the minimum vibration frequency is adopted at the three frequencies and the minimum vibration frequency is achieved, the corresponding damping value of -100 iron powder is higher than that of the other two kinds of particles. However, when the vibration frequency is higher, the effect of fine sand particles on the structure damping value is the best.
In this study, vibration experiments on damping hoop and discrete element software simulation were carried out to design the damping hoop structure and layout scheme on components.

【学位授予单位】：扬州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27;U441.3

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