本文關(guān)鍵詞： 有限元仿真 聲學(xué)流 超聲臺 微納物體 水滴　出處：《南京航空航天大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：壓電作動器的應(yīng)用十分廣泛,可實(shí)現(xiàn)對微納物體的吸附、聚集、移動、旋轉(zhuǎn)等操縱。在生物醫(yī)學(xué)等領(lǐng)域具有重要研究價值。本文使用COMSOL Multiphysics軟件對一種用于銀納米線徑向點(diǎn)聚集的超聲臺進(jìn)行了有限元模型分析,研究超聲臺上水滴中聲學(xué)流的產(chǎn)生機(jī)理及其影響因素。主要內(nèi)容如下:實(shí)現(xiàn)了超聲臺上銀納米線徑向聚集實(shí)驗(yàn),得到了銀納米線徑向移動速度與超聲臺中心點(diǎn)o振動速度之間的特性曲線。利用COMSOL軟件在聲—壓電耦合物理場中建立了超聲臺的有限元模型,并對有限元模型進(jìn)行了模態(tài)分析和諧響應(yīng)分析。利用聲—壓電耦合場求解出水滴內(nèi)部振動速度和聲壓分布后,在蠕動流物理場中求解出水滴中聲學(xué)流的流動分布,并仿真計算得到聲學(xué)流流速與超聲臺中心點(diǎn)o振動速度的特性曲線。與實(shí)驗(yàn)數(shù)據(jù)的吻合證實(shí)了模型與求解方法的正確性。研究影響聲學(xué)流在水滴中分布的因素,發(fā)現(xiàn)雷諾應(yīng)力的梯度對聲學(xué)流的流動分布起到主導(dǎo)作用。同時,研究了聲學(xué)流與超聲臺各組分尺寸間的關(guān)系特性,得出了聲學(xué)流流速與分布隨相關(guān)因素變化的一般規(guī)律。硅基板的厚度減小可增大聲學(xué)流流速,壓電圓環(huán)的厚度增加可增大聲學(xué)流流速;對于固定的壓電圓環(huán)內(nèi)徑或外徑,存在相應(yīng)的外徑值或內(nèi)徑值,使聲學(xué)流流速最大;在硅基板上開槽可增大聲學(xué)流流速。
[Abstract]:Piezoelectric actuators are widely used to achieve the adsorption, aggregation and movement of micro and nano objects. Rotating equal manipulation. Has important research value in biomedical and other fields. This paper uses COMSOL. The finite element model analysis of an ultrasonic platform used for radial point aggregation of silver nanowires was carried out by Multiphysics software. The mechanism and influencing factors of acoustic flow in water droplets on ultrasonic platform were studied. The main contents were as follows: the radial aggregation experiment of silver nanowires on ultrasonic platform was carried out. The characteristic curves between the radial moving velocity of silver nanowires and the o vibration velocity at the center of the ultrasonic station are obtained. The finite element model of the ultrasonic station is established by using COMSOL software in the acousto-piezoelectric coupling physical field. The modal analysis of the finite element model is carried out and the acoustic and piezoelectric coupling field is used to solve the vibration velocity and pressure distribution of the water droplet. The flow distribution of acoustic flow in water droplets is solved in the physical field of peristaltic flow. The characteristic curves of the velocity of acoustic flow and the velocity of vibration at the center of ultrasonic station are obtained by simulation. The validity of the model and the solution method is confirmed by the agreement with the experimental data. The factors influencing the distribution of acoustic flow in water droplets are studied. It is found that the Reynolds stress gradient plays a leading role in the distribution of acoustic flow. At the same time, the relationship between the acoustic flow and the size of each component of the ultrasonic station is studied. The general law of the velocity and distribution of acoustic flow is obtained. The thickness of silicon substrate can increase the velocity of acoustic flow, and the thickness of piezoelectric ring can increase the velocity of acoustic flow. For a fixed piezoelectric ring with internal or external diameter, there are corresponding external diameter or internal diameter, which makes the acoustic flow velocity maximum. The slotted silicon substrate can increase the acoustic flow velocity.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TB552

【共引文獻(xiàn)】

相關(guān)期刊論文 前4條

1 聞人軍;《考工記》中聲學(xué)知識的數(shù)理詮釋[J];杭州大學(xué)學(xué)報(自然科學(xué)版);1982年04期

2 王霞;周建軍;孟愛華;;諧振式超磁致伸縮音頻驅(qū)動器設(shè)計[J];機(jī)電工程;2010年06期

3 閻玉舜,張串,高克成;復(fù)合彎曲振動換能器的相位阻抗變換穿孔板[J];聲學(xué)技術(shù);1998年02期

4 陳嘉言,陶福臻,鄭慶璋,林樹漢;減振與減沖擊[J];中山大學(xué)學(xué)報(自然科學(xué)版);1975年02期

相關(guān)碩士學(xué)位論文 前2條

1 路明;汽車排氣消聲器性能預(yù)測及聲學(xué)特性分析[D];重慶大學(xué);2008年

2 王龍;太空超聲取樣鉆機(jī)的設(shè)計研究[D];中國地質(zhì)大學(xué)（北京）;2011年

，

本文編號：1472350