Focusing ultrasonic levitation
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摘要: 超声悬浮技术在无容器材料制备以及地面空间状态模拟等方面有着广泛的应用前景.利用超声聚焦的原理,把换能器的辐射端设计成曲面,建立了一种单轴式的超声悬浮系统,旨在提高系统的悬浮性能.从理论上分析了此结构中声场的分布情况及其特性,并且对声场作了进一步的数值模拟分析.最后根据此理论设计了几种不同参数的超声悬浮器,进行了一系列的实验验证.实验结果表明此种结构能够提高系统的悬浮性能,系统的悬浮能力以及悬浮稳定性要比平面式超声悬浮系统高.Abstract: The technique of ultrasonic levitation has a wide application in the containerless processing and manufacturing of materials and the status simulation of space on the Earth. Taking advantage of the principle of ultrasonic focusing, a single axis ultrasonic levitation system was set up with the radiator designed into a concave circular one so as to improve the system’s capability of levitation. The distributions and characteristics of the sound field were investigated theoretically. The further research based on the numerical analysis was also conducted. Three sorts of ultrasonic levitation configurations were fabricated and a series of experiments were carried out consequently. The results show that the capability of levitation is directly proportional to the curvature radius of the radiator, as well as the distance between it and the reflector. And the results also proved that the performance of the focusing ultrasonic levitation system is higher than that of the conventional one.
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Key words:
- ultrasonic transducers /
- acoustic radiators /
- focusing /
- numerical analysis
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