具有大振幅放大系数的倒锥形变幅杆  

An inverted cone horn with large amplitude amplification factor

作　　者：张然 贺西平[1] 王照伟 ZHANG Ran;HE Xiping;WANG Zhaowei(Shaanxi Key Laboratory of Ultrasonics,College of Physics and Information Technology,Shaanxi Normal University,Xi’an 710119,China)

机构地区：[1]陕西师范大学物理学与信息技术学院,陕西省超声重点实验室,西安710119

出　　处：《振动与冲击》2020年第24期143-149,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(11774211)。

摘　　要：有些超声处理的应用中,为了使处理范围大、效率高,希望变幅杆有大的输出面积,但小端面输入大输出面变幅杆的放大系数往往小于1。为了满足实际加工中振幅放大系数与应力的要求,提出了一种前端开横向矩形通孔的倒锥形变幅杆。计算了输出端面位移分布规律与平均放大系数,放大系数大于同尺寸的实心变幅杆。研究了孔的几何尺寸对杆放大系数及谐振频率的影响。进一步将变幅杆的平均放大系数作为目标函数进行了优化设计,得到了大放大系数变幅杆的最优开孔尺寸。把优化后变幅杆的四个直角改为了弧形角,减小了(横向)、避免了(纵向)应力集中,该研究对此也进行了分析。In some applications of ultrasonic processing,in order to make the processing range wide and high efficiency,a horn is expected to a large output area.However,the amplification coefficient of the horn with a large output surface is often less than 1.In order to meet the requirement of amplitude amplification factor and stress in actual machining,an inverted cone horn with cuboid hole at the front end was proposed.The displacement distribution law and average amplification factor of the output end were calculated,the amplification factor was greater than that of the solid horn of the same size.The relationship of the amplification factor with geometry of the hole and resonance frequency was studied.The average magnification coefficient of the horn was taken as the objective function to optimize the design and the optimal size of the hole with large amplification factor was obtained.In order to reduce(transverse)and avoid(longitudinal)stress concentration,the four right angles of the cuboid hole were changed to arc angles,which were also analyzed in the paper.

关 键 词：矩形通孔 超声变幅杆 位移分布 放大系数 

分 类 号：O426.2[理学—声学]