谐振管对超声驻波悬浮的影响特性及其实验研究

发布时间：2018-05-07 08:19

本文选题：超声驻波悬浮 + 谐振管　；参考：《吉林大学》2014年硕士论文

【摘要】：随着材料工业、生化分析以及自由液滴动力学等技术的发展，人们对于实验条件的要求越来越高。无容器技术便是这样一种能够在地面上提供良好实验条件的技术。能够在地面上能提供无容器效应的诸多技术当中，超声驻波悬浮技术由于悬浮稳定性好、理论上可以悬浮起任何材料的物体、对悬浮材料没有附加效应等优点，得到了研究者们的青睐，其应用行业及应用领域逐步扩大。从第一台超声驻波悬浮装置的发明到现在，人们通过各种方法来提高超声驻波悬浮装置的性能，其中包括在悬浮装置外加上谐振管这一方法。但目前为止，人们对谐振管对悬浮性能所产生的影响只是加以应用，并未对其影响特性进行分析和研究。鉴于此，本文将以谐振管对驻波悬浮所产生的影响特性为研究对象，对其进行仿真分析和实验研究，以便于人们在不同的情形下能够正确合理的选择谐振管，进而达到增强悬浮能力的目的。本论文给出了压电换能器结构及其参数的设计方法，同时考虑到压电换能器所产生的超声波应具有较大的辐射面积，因而建立了发射端参数与波长之间的关系，并以此为依据对发射端的结构与参数进行了设计。通过Ansys软件对压电换能器和发射端的组合体进行模态分析，分析结果表明，，其固有频率为19330Hz，并且最大位移发生在发射端的边缘处。换能器在频率和位移上均能能够满足使用要求，并按照此设计方法制作了样机。基于本文所设计出的压电换能器，建立了声悬浮装置的有限元模型，完成了不同类型声悬浮装置中，谐振管对声压值所造成影响的对比仿真分析，并通过对声压值的数值运算，得出了相对时间平均势和相对悬浮力的分布图。在完成以上分析之后，发现谐振管对悬浮力和悬浮稳定性均能产生一定影响，并当反射端为凹球面时所产生的影响更为显著的结果。通过所搭建出的超声驻波悬浮测试系统，完成了谐振管对超声驻波悬浮的悬浮力和悬浮稳定性影响的实验研究，实验结果与仿真分析结果基本一致。综上所述，本文从仿真分析和实验两个方面，研究了谐振管对超声驻波悬浮所产生的影响，得出了合适尺寸的谐振管能够有效的提升超声驻波悬浮性能的结论，并且提升效果在反射端为凹球面时更为明显。
[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.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB559

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