The Suspension Characteristics And Experimental Study Of Ultrasonic Standing Wave In Confined Temperature Field

In the existing levitation technology,ultrasonic levitation due to has no additional thermal effect,can suspend any nature of the material.So it is widely used in container-less treatment research.Based on the study of ultrasonic standing wave suspension theory,this paper analyzes the key factors influencing the ultrasonic standing wave suspension,designs a set of closed heating ultrasonic suspension device,and carries out non-contact suspension and heating experiments on various materials.Firstly,the application and development of ultrasonic levitation technology are described in this paper.The research status of acoustic levitation technology is introduced in detail from two aspects: ultrasonic standing wave levitation and near acoustic field levitation.The research on improving the ultrasonic levitation performance and the effects of temperature on the ultrasonic levitation performance are discussed.In this paper,the application of temperature in ultrasonic levitation is introduced.The main contents of this paper are as follows: the design of closed heating ultrasonic levitation device is discussed,and the effect of temperature change is discussed.The levitation mechanism of ultrasonic standing wave is introduced,including the concepts of sound pressure,acoustic radiation and potential well.The levitation position and stability of suspended matter are introduced in detail.At the same time,the influence of temperature on the ultrasonic levitation is introduced.The results show that when the temperature increases,the sound radiation force will decrease.This paper also introduces the principle of heat transfer part,which provides a new method for the heating experiment.The design and research of the closed ultrasonic levitation system are carried out,including the ultrasonic levitation part,the sealing part,the electronic control part and the heating part.In the ultrasonic levitation part,the structure design and material selection of the piezoelectric transducer and the horn are introduced.The whole structure is introduced in the sealing part.In the heating and temperature control part,the heating method and the whole temperature control system are introduced.In the electronic control part,the working principle of stepper motor,stepper motor controller and PLC programmable controller are introduced respectively,and the PLC program is given.The sound pressure distribution of the ultrasonic transducer was simulated by Ansys simulation software,and the distribution under different distance and different temperature were obtained.In the three cases,the maximum sound pressure is compared with the maximum sound pressure value at room temperature,and the maximum sound pressure decreases with the increase of temperature.Finally,the difference between the maximum sound pressure after increasing the temperature and the maximum sound pressure at room temperature is calculated,and find the reduced percentage.The experimental system of ultrasonic levitation heating test was established.The levitation experiment of ultrasonic levitation was carried out at room temperature.Through the experimental results,the conclusion of this theory and simulation is verified,and the conclusion is established.In summary,this paper studies the influence of temperature on the ultrasonic levitation performance from two aspects: simulation analysis and experimental study.It is concluded that increasing the temperature of the sound field will weaken the sound.At the end of the paper,put forward some suggestions for the research,which pave the way for further research.