具有夹角结构纵振动变幅杆的设计方法

发布时间：2018-08-24 13:21

【摘要】：变幅杆是功率超声纵振系统中的关键部件之一,常见的是沿直线方向传播的变幅杆.有的应用场合需要变换纵振动传输方向.本文研究了具有夹角结构的超声纵振动变幅杆的设计方法.利用两端自由边界条件和夹角连接处的位移、力、弯矩及转角连续条件建立了设计变幅杆的频率方程,给出了计算变幅杆振幅放大系数的方法.利用本文中提出的设计方法,计算了若干个由两段杆组成的不同夹角的变幅杆的谐振频率,与有限元计算结果及Vib Pilot系统测试的变幅杆频率基本一致;后与谐振频率为19.8k Hz的压电换能器相连接,激光测振仪测试了系统的谐振频率、变幅杆的放大系数及变幅杆输出端面的振型.测试得到的变幅杆的放大倍数、振型与计算结果吻合.测试的端面振型呈活塞振动,说明在谐振频率上将换能器激励的沿水平方向的纵向振动,经过变幅杆成功地变换到了其输出端上.最后,对该型变幅杆作了大量计算,得出了放大倍数随几何尺寸变化的规律.
[Abstract]:The amplitude change rod is one of the key components in the power ultrasonic longitudinal vibration system. Some applications need to change the direction of longitudinal vibration transmission. The design method of ultrasonic longitudinal vibration horn with angle structure is studied in this paper. Based on the free boundary conditions of two ends and the continuous conditions of displacement, force, moment and rotation angle at the junction of the two ends, the frequency equation of the designed horn is established, and the method of calculating the amplitude magnification factor of the horn is given. By using the design method proposed in this paper, the resonant frequencies of a number of variable amplitude rods with different angles are calculated, which are consistent with the results of finite element method and the frequency measured by Vib Pilot system. Then connected with the piezoelectric transducer with resonance frequency of 19.8k Hz, the resonant frequency of the system, the magnification factor of the horn and the mode shape of the output end surface of the horn were measured by laser vibration measuring instrument. The measured magnification and mode shape of the horn are in good agreement with the calculated results. The measured end vibration is piston vibration, which shows that the longitudinal vibration excited by the transducer along the horizontal direction has been successfully transformed to the output end of the transducer at the resonant frequency. Finally, a large number of calculations are made for this type of horn, and the law of magnification varying with geometric size is obtained.
【作者单位】：陕西师范大学物理学与信息技术学院陕西省超声学重点实验室;
【基金】：国家自然科学基金资助项目(批准号:11374201)
【分类号】：TG663

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