两级阶梯形变幅杆设计及优化

Design and optimization of two-section ultrasonic stepped horn

基于ANSYS workbench多目标驱动优化模块对两级阶梯形变幅杆进行优化设计。基于解析法设计两级阶梯形变幅杆,建立参数化变幅杆模型;在静力学分析基础上对变幅杆进行模态、谐响应分析。通过52个设计点仿真分析获得谐振频率、放大系数、最大应力与变幅杆结构尺寸关系,并优化变幅杆尺寸。研究表明,变幅杆谐振频率小于理论设计频率,振幅放大系数小于理论值,超声能量损耗较大。优化所得变幅杆的谐振频率接近理论设计频率,提高放大系数。为大功率、大振幅的超声变幅杆优化设计提供新的设计、优化思路。

A two-section ultrasonic stepped horn was designed and optimized using the multi-goal driven optimization method based on ANSYS workbench. Based on analytical method,the two-section ultrasonic stepped horn was designed and a parameterized model of the horn was established. In addition,the amplifying rate and resonant frequency of the horn were obtained by using static,modal and harmonic response analyses. A simulation with fifty-two design points selected was carried out,and the relationship between vibration parameters and sizes of the horn was obtained. Moreover,the sizes of the ultrasonic horn were optimized using the multi-goal driven optimization method. The results show that the real resonant frequency is lower than the theoretically designed frequency and the real amplifying rate of the horn inclines to be smaller than the theoretical one. Through optimization,the deviation between the real resonant frequency and theoretically designed frequency is reduced,and the amplifying rate is improved. The paper provides a new optimal design method of ultrasonic horn in high-power ultrasonic machining.