Research On Acoustic Vortex And Radiation Force Field Based On Transducer Array

Acoustic vortex is a spiral sound wave with phase singularity and zero amplitude center.In recent years,due to its unique sound field characteristics,it has received a lot of attention in the field of sound wave manipulation.The research on sound vortex is not only rich in basic academic significance,It also shows broad application prospects in the fields of particle manipulation,object suspension,acoustic wrench,and underwater communication.In this paper,a transducer array is used to generate an active sound vortex,and the unique sound field properties of the vortex sound field are used to analyze the acoustic radiation force of particles in the sound field,and provide a model reference and practical basis for the application of particle manipulation using the acoustic radiation force of the vortex sound field.This topic studies the acoustic vortex and its radiation force field generated by the ultrasonic transducer array from three aspects: theoretical foundation,modeling and simulation,and experimental testing.The main research content includes: According to the Bessel function sound field theory,the acoustic vortex is introduced the theoretical basis of the sound vortex is clarified and the sound field characteristics are clarified.According to the Gorkov’s potential energy theory model,the potential energy transfer process of the sound wave transforming the sound field energy into the acoustic radiation force exerted on the particles is studied.The calculation method of acoustic radiation force is introduced.Then,on the basis of theory,the multiphysics simulation software COMSOL Multiphysics is used to establish a phased array-based ultrasonic transducer array simulation model to study the influence of the transducer array structure on the vortex sound field.First,analyze the sound field characteristics of the vortex sound field based on the simulation results,and discuss the transducer by adjusting the structure of the transducer array in the model,the initial phase setting,the element spacing,the radius of the element,and the number of elements.Correspondence between array parameter design and sound vortex.Using the simulation results to analyze the distribution of potential wells in the acoustic vortex,study the key parameters that affect the shape of the potential well,numerically calculate the acoustic radiation force of the particles in the acoustic vortex,and study the array structure,particle size and acoustic radiation Correspondence of force.Finally,a sound vortex test platform is built,and multi-channel square wave signals are generated based on the existing signal processing method.Each signal is phase-delayed and digitally amplified to drive the ultrasonic transducer array to produce sound,thereby superimposing and generating the sound vortex.According to the simulation results,a transducer array that meets the research objectives is selected,and the sound pressure and phase of the sound vortex generated by it are measured and analyzed.Simulation and experimental results show that a transducer array with compact array arrangement,fine initial phase setting,reasonable array element radius and number of elements,produces a more uniform acoustic vortex phase distribution and a larger sound pressure amplitude gradient.In the acoustic radiation force simulation calculation,it is found that under the same number of array elements,the acoustic radiation force generated by the circular array on the polystyrene particles is greater,and the larger the particle radius,the acoustic radiation force is also significantly increased.The experimental results are basically consistent with the simulation rules,verifying the feasibility of acoustic vortex application in the field of particle manipulation.