Parabolic Rotating Focus The Radiation Body Acoustic Levitation Device

Suspension is the acoustic sound generator of the acoustic waves reflected by the reflector, the reflected waves meet with the launch wave in space, superimposed acoustic standing wave formation at nodes on the object wave can be stable up an acoustic suspension technology. In the ultrasonic frequency range and high intensity conditions, the nonlinear acoustic field characteristics will be shown more clearly. In fact, ultrasound is the object suspended in nonlinear acoustic field acoustic radiation pressure and gravity are the static equilibrium of a nonlinear phenomenon. The basic principle is to use acoustic standing wave generated by vertical suspension force and interaction between objects in order to overcome the weight of the object, while the horizontal force generated by positioning the object fixed on the sound pressure waves Festival Office.Acoustic levitation device design and construction is the key to the success of floating objects, generally divided into two kinds of uniaxial type and three-axis. Single type is in the vertical direction to generate a standing wave, the orientation force suspension by the cylindrical cavity excited by the sound field of a certain model to provide. Axis of three orthogonal directions in space were excited a standing wave to control the position of objects, objects floating in space can move or rotate. Obviously three-axis suspension device is based on Single-type suspension in the design and installation requirements to be much complex in uniaxial type.Acoustic levitation device is divided into single type and three-axis two, the former is in the vertical direction is a standing wave, the orientation force suspension by the cylindrical cavity excited by the sound field of a certain model to provide. The latter is the three orthogonal directions in space were excited a standing wave to control the location of the object.Constraints of acoustic levitation technique widely used in practice is an important factor is the current very few features strong power, strong and stable suspension of simple acoustic levitation device. The three-axis suspension device is developed based on uniaxial type and cost of equipment is more expensive and difficult to mass production. If we can develop a radiation power, suspension and strong uniaxial acoustic levitation device, bound to be widely used.This single-axis acoustic levitation for the current weak, with the combination of theoretical and experimental methods, single-axis acoustic levitation device for improving the capacity and the main factors affect the suspension carried on a more systematic and profound study, obtained the following main several aspects of the study.1,Ultrasonic horn can ultrasonic vibration amplitude of the displacement amplitude or velocity increased, and can be shaped. Horn shape and size of the different growth rate could reach different results.2,Another way to obtain high intensity focused the use of sound principles. Transducer can be designed to focus radiation type; also be used to focus acoustic lens; or reflective surfaces using focused reflection focused manner. Reflection of different shapes with different face of the formation of standing wave intensity.3,Reasonable combination of different shapes of focusing device, to achieve the desired resonant in the case of a large degree can improve the sound transducer radiated power in space can form high-intensity sound field, the weight of objects suspended its great.4,Using finite element analysis software ANSYS suspension system horn, focusing was carried on the natural frequency of vibration forms of simulation to find and to play a guidance and amendments to the device size, structure, role.5,Quantitative changes in sub-reflector distance between the transmitter and observe the location and capabilities of suspended objects and changes in distribution, have been reduced with the resonance is not suspended from the growing ability of the experimental results.