非谐振大工具头变幅杆优化设计及声学特性测试

Optimization design and characteristics test of non-resonant large tool head horn

采用分段近似趋近法,将砂轮简化为圆柱体,将它和变幅杆组合成变幅器并建立整个变幅器的动力学模型。利用传输矩阵对其进行理论分析,并得到各段直径、长度对整个变幅器放大系数的影响规律。在此基础上进行ANSYS有限元优化,优化后频率偏差降低了4.7 Hz,放大系数增加了1.73%,位移节点向前移动了6.9mm。相关动力学特性测试发现,所设计的超声声学系统的输出端能够达到滴水雾化的效果,且在8h连续工作过程中纵振效果良好,从而实现了非谐振大工具头变幅杆的设计。

The piecewise approximation approach method was used to simplify the grinding wheel to cylinder. The amplitude horn was combined with grinding wheel, and the dynamic model of the whole amplitude transformer was built. The analytical solution was calculated by transfer matrix method, and the influence law of each sectionrs diameter and length on amplification coefficient for the whole amplitude transformer was obtained. Then, the ANSYS finite element optimization was performed. The optimized deviation reduced 4. 7 Hz, amplification coefficient increased by 1.73%, and the displacement nodes moved forward 6.9 mm. Finally, the related dynamic charac- teristics of the whole amplitude transformer were tested, and found that ultrasonic atomization was observed when water was dripped on the output of the designed ultrasonic acoustic system. The effect of longitudinal vibration was good in continuous operation for 8 hours, and the design of non-resonant large tool head horn was realized.