An improved phase-locked loop method for automatic resonance frequency tracing based on static capacitance broadband compensation for a high-power ultrasonic transducer

2012 ◽  
Vol 59 (2) ◽  
pp. 205-210 ◽  
Author(s):  
Hui-juan Dong ◽  
Jian Wu ◽  
Guang-yu Zhang ◽  
Han-fu Wu
Keyword(s):  
Resonance Frequency ◽  
High Power ◽  
Ultrasonic Transducer ◽  
Phase Locked Loop ◽  
Loop Method ◽  
Static Capacitance ◽  
Power Ultrasonic

FEM Modeling of Vibro-Impact Response of Metal Plates Excited by a High-Power Ultrasonic Transducer

2012 ◽  
Vol 197 ◽  
pp. 278-282
Author(s):  
Zhao Jiang Chen ◽  
Shu Yi Zhang ◽  
Zhi Liang Zhang
Keyword(s):  
Contact Force ◽  
High Power ◽  
Ultrasonic Transducer ◽  
Vibration Velocity ◽  
Nonlinear Phenomena ◽  
Fem Modeling ◽  
Frequency Spectra ◽  
Metal Plates ◽  
Power Ultrasonic ◽  
Subharmonic Vibration

When thin metal plates are excited by a high-power ultrasonic transducer, superharmonic and high-order subharmonic vibration phenomena of the plates are observed in our experiments. However, the nonlinear mechanism in the system is still not fully understood. In this paper, a finite element model is established based on the experimental conditions and numerical simulations are performed to explore the generation mechanism of the nonlinear vibration. By comparing the waveforms and frequency spectra of the vibration velocity of the plate to these of the contact force between the ultrasonic horn tip and the plates, it can be found that waveform distortion of the contact force is the main reason for generating the superharmonic vibration, while the intermittent contact-impact between the horn tip and the plate is the reason for subharmonic vibration in the plate. The FEM simulation results can explain reasonably the observed experimental phenomena, which are useful to help to improve the effects of the nonlinear phenomena occurred in ultrasonic processing.

Sign in / Sign up

Export Citation Format

Share Document