基于LDV扫描测试劈刀稳态振动规律研究

Study on Steady State Vibration of Bonding Tool Based on Laser Doppler Vibrometer

利用激光多普勒测振仪对受正弦激励、超声加载作用下振动的劈刀进行连续扫描测试,得到其稳态振动形态。介绍了一种Hilbert变换的模态分析方法,当仅改变劈刀与变幅杆连接的松紧度时,由试验现象和模拟振动结果发现:当连接松紧度发生变化时,劈刀的稳态振动表现出不确定性;同一松紧度下振动中出现单节点,但不同松紧度下节点出现位置不同;劈刀末端的速度振幅并不是期望的那样是最大。该结论对优化设计超声振动系统、提高超声能量的利用率有一定的意义。

This paper dealt with a vibration modal measurement for a sinusoi dally-excited and ultrasonic-loaded bonding tool by continuously scanning with a laser Doppler vibrometer. A Hilbert-transform-based approach was proposed for analyzing the vibration mode. The experimental results show that when the tightness changes, the steady state vibrat ion shows uncertainty; under the same tightness it appeares a single-node, but under different tightness the node will change its position and the velocity amplitude at the end of the tool is not as large as expected. These conclusions have important significance in optimal design of ultrasonic vibration systems and improving the efficiency of ultrasonic energy transmission.