Simulation And Experimental Research Of Ultrasonic Standing Wave Atomization Acoustic Fields

3D printing technology is known as a revolutionary technology.Laser-selective melting technology can be used to directly prepare parts of any shape and parts with complete metallurgical bonding.However,this technique has high demand for powders,poor quality powders will cause problems such as poor density and low strength.There are many powder preparation technologies available,However,the powder yield and powder quality are not enough to meet the demand.In order to improve the problems,the use of ultrasonic standing wave field for non-contact atomization of molten metal to obtain metal powder has been favored by researchers.This subject has studied a requirement for non-contact ultrasonic standing wave atomization of molten metal,Based on the principle of the acoustic field characteristics of ultrasonic standing wave sound field and the ultrasonic standing wave atomization,the following research was conducted on the acoustic field characteristics of ultrasonic standing wave,the test platform of ultrasonic standing wave atomization and the measurement of acoustic fields:Based on the principle of the acoustic field characteristics of ultrasonic standing wave sound field,the simulation model of ultrasonic standing wave sound field is established.The unsteady sound field and steady-state sound field characteristics of the ultrasonic standing wave in this model are analyzed.The sound field characteristics of different radial positions and the sound field characteristics of the disturbed sound field are analyzed.The effects of frequency and environmental back pressure changes on the sound field characteristics are investigated,the structural parameters of the ultrasonic standing wave sound field are optimized.The overall scheme of the ultrasonic standing wave atomization test platform was built,including the ultrasonic generating part,the feeding part,the powder collecting part and the atomizing sealing part.The magnetostrictive transducer was simulated and the structure was designed,the overall construction of the ultrasonic standing wave test platform was completed.The experimental measurement of the sound field generated by the ultrasonic standing wave atomization test bench was carried out.Based on the principle of CPB and FFT analysis,the sound pressure measurement method of the ultrasonic standing wave is measured by the sound field measurement system of the sounder.Based on the laser displacement sensor measurement principle,the amplitude of the ultrasonic transducer tool head was measured using the built-in amplitude measurement system.The correctness of the numerical simulation of the ultrasonic standing wave sound field is verified.Based on the ultrasonic standing wave atomization test platform,atomization experiments were carried out on different concentrations of glycerin aqueous solution.The non-contact atomization phenomenon of the ultrasonic wave standing wave field is analyzed,and the effects of different viscosity and surface tension on the atomization effect are explored.