本文關鍵詞： 有限元仿真 聲學流 超聲臺 微納物體 水滴　出處：《南京航空航天大學》2014年碩士論文　論文類型：學位論文

【摘要】：壓電作動器的應用十分廣泛,可實現(xiàn)對微納物體的吸附、聚集、移動、旋轉等操縱。在生物醫(yī)學等領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聚集的超聲臺進行了有限元模型分析,研究超聲臺上水滴中聲學流的產生機理及其影響因素。主要內容如下:實現(xiàn)了超聲臺上銀納米線徑向聚集實驗,得到了銀納米線徑向移動速度與超聲臺中心點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,并對有限元模型進行了模態(tài)分析和諧響應分析。利用聲—壓電耦合場求解出水滴內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流的流動分布,并仿真計算得到聲學流流速與超聲臺中心點o振動速度的特性曲線。與實驗數(shù)據(jù)的吻合證實了模型與求解方法的正確性。研究影響聲學流在水滴中分布的因素,發(fā)現(xiàn)雷諾應力的梯度對聲學流的流動分布起到主導作用。同時,研究了聲學流與超聲臺各組分尺寸間的關系特性,得出了聲學流流速與分布隨相關因素變化的一般規(guī)律。硅基板的厚度減小可增大聲學流流速,壓電圓環(huán)的厚度增加可增大聲學流流速;對于固定的壓電圓環(huán)內徑或外徑,存在相應的外徑值或內徑值,使聲學流流速最大;在硅基板上開槽可增大聲學流流速。
[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.
【學位授予單位】：南京航空航天大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TB552

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