Experimental Study On Uniaxial ANSYS Simulation Acoustic Levitation Device

Acoustic levitation is acoustic generators sent wave after reflection board reflection, reflective sound waves and transmitting sound waves in space after the encounter, superimposed in forming acoustic standing waves, objects located at the node of the acoustic wave can be stable levitation of a acoustic technology. In the ultrasonic frequency range under the condition of strong and loud, nonlinear acoustic field characteristics of performance is obvious. Ultrasonic levitation is an object of nonlinear sound field of acoustic radiation pressure for upward and downward gravity equilibrium and nonlinear phenomena in stillness. Its basic principle is to use acoustic standing wave in vertical direction of levitation force to overcome the gravity of an object and objects, on both the horizontal positioning of objects fixed in section of sound pressure waves.The technology in the agricultural, industrial and other fields have a very wide range of applications. It’s also in the space as well as ground containerless processing of various materials under the condition of a key technology. Containerless solidification of material, non-contact measurement of physical properties of liquid droplet dynamics and free plays a major role in the research. In agriculture, in order to cultivate the fine seed, seed and avoid contact ultrasonic levitation techniques can also be used. Compared with conventional suspension technology, it is also not limited by material is conductive, and suspension and heating can be individually controlled, also can be used in studies of non-metallic materials and low melting point alloy on containerless solidification, heat, and transport. At the same time as aerospace technology advances, as well as the continuous development and utilization of space resources, application of acoustic levitation is more diverse, is more of a broad range of applications, will be gradually developed into a great potential, there are broad prospects for containerless processing technology.Acoustic levitation device design and composition is the key to success of suspension of the object, typically include single-shaft suspended suspended two and three axis. Single-axle suspension means to produce a standing wave in a vertical direction, suspended positioning of objects by certain modes of cylindrical cavity resonator excited by sound field provided; three-shaft is suspended in space in three orthogonal directions which inspire a standing wave is used to control the position of objects, allows the suspension to move or rotate objects in space. Obviously suspension device of three-axis is the single-shaft suspended on the basis of device design and requirement to be much more complex than single-axis type suspension device.Up to now, acoustic levitation technique and its application in practice has not been extensive. A very important reasons for this are few strong features, power, suspended the ability of strong and stable simple acoustic levitation devices. Three-axle suspension device is in suspension device developed on the basis of single-axis and the cost of more expensive equipment, mass production was not easy. If you can produce a radiation power, suspended the ability of strong single-axis acoustic levitation devices, will inevitably make it more extensive and practical application.This paper focuses on the current single-axis acoustic levitation devices suspended power is relatively weak, suspended unstable situation, with a combination of theoretical and experimental methods, improvement on single-axis acoustic levitation devices and the main factors affecting the ability of suspension will be more systems, an in-depth study, mainly achieved the following results.1. ultrasonic horn or displacement amplitude of ultrasonic vibration speed amplitude increasing, and connections with other acoustic devices more easily and match, using Horn increases the amplitude can be combined with focusing device enables sound to focus at the same time, so as to improve the ability of suspension.2. get loud is an effective method of strong focusing principle, focused-radiation or transducers are designed with acoustic lens for focusing; can also use reflector to the incident sound wave reflection formation focusing of acoustic standing waves. Reflector surface-different, reflective plates to radiation surface standing wave sound field obtained from different, focusing on regions.3.the use of finite element analysis software ANSYS for suspension system of ultrasonic vibration of ultrasonic Horn, sound could focus on the simulation of the vibration patterns, which plays a guidance and correction device size, structure, in order to better achieve the resonance effect of the two.4.Horn and rational combination of shape, size of focused radiation, both impedance matching, harmonic oscillator under ideal conditions, you can greatly improve the transducers of acoustic radiation power, can form a high-intensity acoustic field in space, floating ability and stability with a larger increase.5. High frequency sound waves of shorter wavelength in air, to half a wavelength of the spacing distance change the reflector and the transmitter, observe how objects suspended position and suspension changes and distribution has been constantly decreasing as the reflector and the transmitter spacing suspension of enhanced before weakening results.