本文選題：超聲換能器 + 反節(jié)點(diǎn)��； 參考：《南京航空航天大學(xué)》2014年碩士論文

【摘要】：壓電換能器是一種依靠壓電材料的正、逆壓電效應(yīng)來實現(xiàn)電能與機(jī)械能之間互相轉(zhuǎn)換的器件。壓電換能器為超聲技術(shù)應(yīng)用的主要工具，其種類多且用途非常廣泛，，其中在微納米物質(zhì)操縱上的應(yīng)用前景非常廣闊。本課題研究均直型超聲針換能器工作時利用聲學(xué)流驅(qū)動微納米物質(zhì)在針身反節(jié)點(diǎn)或者整個針身下面的硅基板上集聚的特性，主要研究內(nèi)容如下： 介紹了操縱微納米物質(zhì)現(xiàn)有的各種方法及各自的優(yōu)缺點(diǎn)，詳細(xì)的介紹了超聲操縱微納米物質(zhì)目前的研究現(xiàn)狀、壓電驅(qū)動技術(shù)，并且闡述了本研究課題的目的、范圍以及課題意義。 通過實驗與理論相互驗證的方法，研究了均直型超聲針換能器驅(qū)動微納米物質(zhì)集聚的特性與機(jī)理。超聲針在高頻振動下集聚微納米物質(zhì)，其工作在彎曲模態(tài)。此時針身反節(jié)點(diǎn)兩邊會形成對稱的聲學(xué)流，從而驅(qū)動微納米物質(zhì)跟隨聲學(xué)流到針身反節(jié)點(diǎn)下基板上成線性非連續(xù)斑點(diǎn)集聚。 研究了當(dāng)在成斑點(diǎn)集聚的實驗操作基礎(chǔ)上再增加在針身軸向上的均勻往復(fù)運(yùn)動，從而實現(xiàn)微納米物質(zhì)在整個針身下集聚成線連續(xù)集聚。 研究了聲學(xué)流產(chǎn)生的原因，并利用有限元軟件COMSOL計算仿真了針身反節(jié)點(diǎn)周圍的聲學(xué)流圖案，其與實驗中觀察得到的聲學(xué)流圖案是一致的。同時對靠近基板的聲學(xué)流集聚微納米物質(zhì)作了力學(xué)分析，估算出基板上單個酵母菌所受驅(qū)動力的數(shù)量級為。
[Abstract]:Piezoelectric transducer is a kind of device which depends on the direct and inverse piezoelectric effect of piezoelectric material to realize the mutual conversion between electrical energy and mechanical energy. Piezoelectric transducer is the main tool for ultrasonic technology. It has a wide range of applications and has a broad application prospect in the manipulation of micro-nano materials. In this paper, we study the characteristics of micro and nano materials agglomerating on the antinode of the needle body or the silicon substrate under the needle body when the straight ultrasonic needle transducer works. The main research contents are as follows: This paper introduces the existing methods of manipulating micro and nano materials and their advantages and disadvantages, introduces in detail the current research situation of ultrasonic manipulation of micro and nano materials, piezoelectric driving technology, and describes the purpose of this research subject. Scope and significance of the project. By means of experimental and theoretical verification, the characteristics and mechanism of uniform straight ultrasonic needle transducer driving the aggregation of micro and nano materials are studied. The ultrasonic needle accumulates the micro-nano material under the high frequency vibration, and it works in the bending mode. At this time, symmetrical acoustic flow will be formed on both sides of the needle body anti-node, which drives the micro-nano matter to follow the acoustic flow to the substrate under the needle body anti-node to form linear discontinuous speckle aggregation. The uniform reciprocating motion in the axial direction of the needle body was studied on the basis of the experimental operation of speckle agglomeration, so as to realize the continuous aggregation of micro and nano materials under the whole needle body. The cause of acoustic flow is studied, and the acoustic flow pattern around the anti-node of needle body is simulated by the finite element software COMSOL, which is consistent with the acoustic flow pattern observed in the experiment. At the same time, the acoustic flow near the substrate was analyzed, and the order of magnitude of the driving force of the single yeast on the substrate was estimated.
【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)】

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