大尺寸三维超声振动系统的智能优化设计

Intelligent optimization design of large-scale three-dimensional ultrasonic vibration

对大尺寸三维超声换能器系统的耦合振动进行有效控制,优化系统的性能,一直都是功率超声领域亟待解决的难题.研究发现,一些声子晶体槽、孔结构可以对大尺寸换能器系统的横向振动进行抑制,提高系统振幅分布均匀度,且可以通过改变声子晶体结构的配置参数人为地实现对大尺寸三维超声振动系统性能的调控.但过多的设计参数必然会增加系统设计的复杂度,且目前大尺寸三维超声换能器系统的优化设计依赖于经验试错法,设计效率和成功率较低,性能也无法保证.研究引入同质位错、点缺陷结构对大尺寸三维超声振动系统进行优化设计,并利用数据分析技术评价了同质位错、点缺陷结构的配置对系统辐射面的纵向位移振幅、振幅分布均匀度、辐射声功率、工作带宽等的影响规律,建立了同质位错结构、近周期缺陷结构的结构参数——大尺寸超声换能器系统性能的预测模型,实现了对大尺寸功率超声换能器系统的智能设计,提高了设计效率和成功率,降低了设计成本.

Large-scale three-dimensional ultrasonic vibration systems are susceptible to the influence of coupled vibration,resulting in a series of problems such as increased energy loss,small longitudinal displacement amplitude of the radiation surface,and uneven distribution of longitudinal displacement amplitude,which can seriously affect the working efficiency of ultrasonic processing system.How to effectively control the coupled vibration of large-scale three-dimensional ultrasonic transducer systems and optimize their performance has become an urgent problem in the field of power ultrasound.The research has found that some phononic crystal slots and point defect structures can suppress the lateral vibration of large-scale transducer systems,improve the uniformity of system amplitude distribution,and artificially regulate the performance of large-scale threedimensional ultrasonic vibration systems by changing the configuration parameters of phononic crystal structures.However,excessive design parameters will inevitably increase the complexity of system design,and,currently,the optimization design of large-scale three-dimensional ultrasonic transducer systems relies on empirical trial and error methods which has low design efficiency and low success rate,and cannot guarantee the system performance.Therefore,in the study,homogeneous dislocations and point defect structures are introduced to optimize the design of large-scale three-dimensional ultrasonic vibration systems.Data analysis techniques are used to evaluate the influences of the configuration of homogeneous dislocations and point defect structures on the longitudinal displacement amplitude,amplitude distribution uniformity,radiated sound power,working bandwidth of the system’s radiation surface.And a predictive model for the performance of large-scale ultrasonic transducer system with homogeneous dislocation structure and near periodic defect structure is established,which can achieve intelligent design of large-scale power ultrasonic transducer system,improve design efficiency and success rate,and reduce the design cost.