Most conventional high-frequency vibrators used in ultrasonic applications like machining or welding processes generate the working power based on principles of piezoelectric or magneto-strictive effects (see Fig. 1 & Fig. 2). After entering the transducer, the time-varying electric input energy will then be transformed into solid-body vibration; however, the heat dissipated during energy transduction and the high-frequency electric input source has made them more complex of such transducers. Hence, in this work the use of pneumatic excitation was proposed as an alternative, which aimed to utilize the self-cooling property of gas and the availability of such phenomenon under constant air pressure.
Fig. 1 Common Langevin type piezoelectric transducers (courtesy of Tamura Corp.)
