刀具负载对蜂窝复合材料超声切割声学系统阻抗特性的影响

针对刀具负载对蜂窝复合材料超声切割声学系统的影响,利用四端网络法,将压电换能器与变幅杆结合在一起,提出了声学系统的整体设计方程,得出了负载与声学系统阻抗特性的关系式。利用有限元软件对声学系统进行模态分析及谐响应分析,并利用阻抗分析仪和激光位移传感器对声学系统的阻抗﹑谐振频率和输出振幅进行检测。仿真和实验结果表明：随着刀具负载的增大,声学系统的阻抗值增大,谐振频率减小,但仿真与实验得出的输出振幅与理论分析不同,这是由于刀具的放大作用造成的。研究结果对声学系统的设计及实际应用有指导意义。

Influences of Cutting Tool Load on Impedance Characteristics of Honeycomb Composite Material Ultrasonic Cutting Acoustic System

The impedance characteristics of a honeycomb composite material ultrasonic cutting acoustic system varied with the cutting tool load. By combing piezoelectric transducer with horn, a hybrid design equation of the acoustic system was put forward based on four-terminal network, and the relationship between load and the impedance characteristics of acoustic system was obtained. The modal analysis and the harmonic response analysis to the acoustic system were carried on by using of the finite element software and the impedance, resonant frequency and output amplitude of the acoustic system were measured by the impedance analyzer and laser displacement sensor. Simulation and experimental results show that the impedance of the acoustic system is increased, and the resonance frequency decreases with the increase of the tool load, but the output amplitudes among theoretical analysis, simulation and experiment are different, which is due to the amplification of the tool. The study has a guiding significance for the design and applications of honeycomb composite material ultrasonic cutting acoustic system.