本文選題：超聲駐波懸浮 + 諧振管��； 參考：《吉林大學(xué)》2014年碩士論文

【摘要】：隨著材料工業(yè)、生化分析以及自由液滴動力學(xué)等技術(shù)的發(fā)展，人們對于實驗條件的要求越來越高。無容器技術(shù)便是這樣一種能夠在地面上提供良好實驗條件的技術(shù)。能夠在地面上能提供無容器效應(yīng)的諸多技術(shù)當(dāng)中，超聲駐波懸浮技術(shù)由于懸浮穩(wěn)定性好、理論上可以懸浮起任何材料的物體、對懸浮材料沒有附加效應(yīng)等優(yōu)點，得到了研究者們的青睞，其應(yīng)用行業(yè)及應(yīng)用領(lǐng)域逐步擴大。 從第一臺超聲駐波懸浮裝置的發(fā)明到現(xiàn)在，人們通過各種方法來提高超聲駐波懸浮裝置的性能，其中包括在懸浮裝置外加上諧振管這一方法。但目前為止，人們對諧振管對懸浮性能所產(chǎn)生的影響只是加以應(yīng)用，并未對其影響特性進(jìn)行分析和研究。鑒于此，本文將以諧振管對駐波懸浮所產(chǎn)生的影響特性為研究對象，對其進(jìn)行仿真分析和實驗研究，以便于人們在不同的情形下能夠正確合理的選擇諧振管，進(jìn)而達(dá)到增強懸浮能力的目的。 本論文給出了壓電換能器結(jié)構(gòu)及其參數(shù)的設(shè)計方法，同時考慮到壓電換能器所產(chǎn)生的超聲波應(yīng)具有較大的輻射面積，因而建立了發(fā)射端參數(shù)與波長之間的關(guān)系，并以此為依據(jù)對發(fā)射端的結(jié)構(gòu)與參數(shù)進(jìn)行了設(shè)計。通過Ansys軟件對壓電換能器和發(fā)射端的組合體進(jìn)行模態(tài)分析，分析結(jié)果表明，，其固有頻率為19330Hz，并且最大位移發(fā)生在發(fā)射端的邊緣處。換能器在頻率和位移上均能能夠滿足使用要求，并按照此設(shè)計方法制作了樣機。 基于本文所設(shè)計出的壓電換能器，建立了聲懸浮裝置的有限元模型，完成了不同類型聲懸浮裝置中，諧振管對聲壓值所造成影響的對比仿真分析，并通過對聲壓值的數(shù)值運算，得出了相對時間平均勢和相對懸浮力的分布圖。在完成以上分析之后，發(fā)現(xiàn)諧振管對懸浮力和懸浮穩(wěn)定性均能產(chǎn)生一定影響，并當(dāng)反射端為凹球面時所產(chǎn)生的影響更為顯著的結(jié)果。 通過所搭建出的超聲駐波懸浮測試系統(tǒng)，完成了諧振管對超聲駐波懸浮的懸浮力和懸浮穩(wěn)定性影響的實驗研究，實驗結(jié)果與仿真分析結(jié)果基本一致。 綜上所述，本文從仿真分析和實驗兩個方面，研究了諧振管對超聲駐波懸浮所產(chǎn)生的影響，得出了合適尺寸的諧振管能夠有效的提升超聲駐波懸浮性能的結(jié)論，并且提升效果在反射端為凹球面時更為明顯。
[Abstract]:With the development of materials industry, biochemical analysis and free droplet dynamics, the requirements of experimental conditions are becoming higher and higher. Container-free technology is such a technology that can provide good experimental conditions on the ground. Among the many technologies that can provide no container effect on the ground, the ultrasonic standing wave suspension technology has the advantages of good suspension stability, theoretically suspending any material, no additional effect on the suspension material, and so on. Has been favored by researchers, its application industry and application field gradually expanded. Since the invention of the first ultrasonic standing wave suspension device, a variety of methods have been adopted to improve the performance of the ultrasonic standing wave suspension device, including the addition of resonant tubes to the suspension device. But up to now, the effect of resonant tube on suspension performance is only applied, but not analyzed and studied. In view of this, this paper will take the influence of resonant tube on standing wave suspension as the research object, and carry on the simulation analysis and experimental research on it, so that people can select the resonant tube correctly and reasonably under different circumstances. And then achieve the purpose of enhancing suspension ability. In this paper, the design method of piezoelectric transducer structure and its parameters is given. Considering that the ultrasonic wave produced by piezoelectric transducer should have a large radiation area, the relationship between the parameters of the emitter and the wavelength is established. Based on this, the structure and parameters of the transmitter are designed. The modal analysis of the combination of piezoelectric transducer and emitter is carried out by Ansys software. The results show that the natural frequency is 1 330 Hz and the maximum displacement occurs at the edge of the emitter. The transducer can meet the requirements of frequency and displacement, and the prototype is made according to the design method. Based on the piezoelectric transducer designed in this paper, the finite element model of the acoustic levitation device is established, and the comparative simulation analysis of the influence of the resonant tube on the sound pressure value in different types of acoustic levitation devices is completed, and the numerical calculation of the sound pressure value is carried out. The distribution of relative time average potential and relative suspension force is obtained. After the above analysis, it is found that the resonant tube has a certain influence on the suspension force and suspension stability, and the effect is more obvious when the reflector is a concave sphere. The experimental study on the influence of resonant tube on the suspension force and stability of ultrasonic standing wave suspension is carried out by using the ultrasonic standing wave suspension test system. The experimental results are in good agreement with the simulation results. To sum up, the influence of resonant tube on ultrasonic standing wave levitation is studied from two aspects of simulation analysis and experiment, and the conclusion is drawn that the appropriate size resonant tube can effectively improve the performance of ultrasonic standing wave suspension. And the lifting effect is more obvious when the reflector is concave sphere.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TB559

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