本文關(guān)鍵詞：顆粒阻尼減振箍設(shè)計及其減振性能實驗研究　出處：《揚州大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 減振箍 拉索 阻尼 非阻塞性微顆粒 離散單元法 EDEM

【摘要】：大跨斜拉橋拉索由于重量輕、剛度小、阻尼低而極易發(fā)生振動,拉索的振動控制已成為國內(nèi)外工程領(lǐng)域研究的熱點問題。有效地提高拉索的阻尼是抑制拉索振動的關(guān)鍵。 本文擬利用顆粒阻尼的增大阻尼效果顯著、減振頻帶寬等優(yōu)點,設(shè)計能在拉索上用的顆粒阻尼減振箍以提高拉索的結(jié)構(gòu)阻尼,期望能在各種因素引起的拉索振動情形下均以有效地控制拉索的振動；通過對減振箍的振動實驗和基于離散元理論的數(shù)值分析,對減振箍的構(gòu)造以及顆粒阻尼相關(guān)參數(shù)如顆粒材料、粒徑、填充率和質(zhì)量比等進行分析,以獲取減振箍的合理構(gòu)造形式及顆粒阻尼參數(shù)的合理取值范圍；通過對配置了減振箍的拉索進行自振動實驗以及對拉索的顆粒阻尼模型進行數(shù)值分析,對減振箍以及顆粒阻尼參數(shù)進行優(yōu)化調(diào)整；根據(jù)拉索的風(fēng)雨振動和參數(shù)振動實驗結(jié)果,總結(jié)減振箍的減振效果,揭示減振箍的耗能減振機理；提出減振箍的設(shè)計思路與準則。 1、單減振箍振動實驗中,對于兩種不同形式的減振箍即扇柱空腔減振箍和圓柱空腔減振箍,實驗充分地對比了兩者減振性能。圓柱空腔單減振箍對于同一振動頻率和同種填充顆粒時的結(jié)構(gòu)阻尼值偏大。 2、單減振箍振動實驗中,在實驗中其他條件都相同時,振動頻率越高對應(yīng)結(jié)構(gòu)的阻尼值就越大。 3、在扇柱空腔雙減振箍振動中,對比單減振箍實驗,扇柱空腔雙減振箍在三種不同振動頻率下的減振性能要高于扇柱空腔單減振箍。 4、在扇柱空腔雙減振箍振動中,在實驗中其他條件都相同時,結(jié)構(gòu)整體的阻尼值隨著振動頻率的提高有所增加。 5、扇柱空腔雙減振箍在三種不同頻率振動下,采用最小的振動頻率時,-100目鐵粉的對應(yīng)的結(jié)構(gòu)阻尼值要高于其他兩種顆粒,而在較高頻率振動時,細砂顆粒對結(jié)構(gòu)阻尼值的增大效果最好。 本研究通過針對減振箍進行振動實驗,結(jié)合離散元軟件模擬,設(shè)計出具有減振效果明顯的減振箍構(gòu)造形式以及在構(gòu)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.

【學(xué)位授予單位】：揚州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U448.27;U441.3

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本文編號：1427943