Correct Prediction of the Vibration Behavior of the High Power Ultrasonic Transducers by Fem Simulation

  • Abbas Pak
  • Amir Abdullah
Conference paper

Abstract

High power ultrasound is nowadays used in a wide variety of applications ranging from medical devices, ultrasonic cleaning, ultrasonic welding and machining to sonochemistry [1]. Since Prof. Langevin developed the first sandwich ultrasonic transducer by embedding piezoelectric rings between two metals and employed it for high intensity vibration, there have been great efforts in modeling and formulating such transducers [2, 3, 4, 5]. Of all proposed methods, Mason’s has been found the best in design and analysis of PZT transducers. He has offered the Equivalent Circuit Method (ECM) [1&2]. Finite Element Method (FEM) is the most reliable one for analyzing the ultrasonic transducers [6, 7, 8, 9, 10, 11, 12, 13, 14]. By using the analytical method the dimensions of high power ultrasonic transducer components were estimated by assuming a certain resonant frequency and a certain power. Then, the finite element analysis provided by commercial ANSYS was employed for 2D, 1/4 3D and full 3D FEM analysis to observe the vibration behavior of the transducer and to find the validity of the analytical method. The FEM analysis was performed under two separate statuses of electrical conditions, In the first case which is commonly called the “resonance” condition, a constant voltage of zero was applied at all electrical contacts of ceramic disks. This is a condition of “short-circuit” where all voltage potentials are connected to common ground, In the second case, called “anti-resonance”, only one of the negative poles or the positive poles of the piezo-ceramic disks were connected to zero voltage of common ground and the other poles were left free without any connection. This represents an “open-circuit” condition.

Keywords

Welding 

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Copyright information

© Springer 2007

Authors and Affiliations

  • Abbas Pak
    • 1
    • 2
  • Amir Abdullah
    • 1
    • 2
  1. 1.Manufacturing Group, School of EngineeringTarbiat Modarres UniversityTehranIran
  2. 2.Associate Professor of Mechanical Engineering in Advanced Manufacturing TechnologiesIran

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