Design and Research of a Miniature Pneumatic Vibrator
Date Issued
2009
Date
2009
Author(s)
Lee, Yu-Hsiu
Abstract
Most conventional high-frequency vibrators generate the working power basedn the piezoelectric and magnetostrictive effects. After entering the transducingystem, the input time-varying electric energy will then be transferred into solid-bodyibration; however, the heat dissipated has always been a critical issue of suchibrators. Therefore, the objective of this research was to develop a miniatureigh-frequency vibrator with high power output and high energy efficiency, whichook advantage of the self-cooling property of gas and the pneumatic instability torigger the vibration motion. Two aerostatic bearings were placed in the oppositeonfiguration with the driven part oscillating back and forth due to the pneumaticammer phenomenon. Full analysis was done by both theoretical calculation andinite element method. Predictions of load capacity, equivalent stiffness, and excitedibrating frequency were all proved possible and applicable while measurements ofhe unloading and loading characteristics of the vibrator were carried out byxperiments. Besides, parameters including driven mass and spring loading effectere examined to a thorough understanding. In the end, modifications for theesigned vibrator were proposed to acquire better system performance.
Subjects
vibrators
flow-induced vibrations
ultrasonic transducers
aerostatic bearings
pneumatic hammer
SDGs
Type
thesis
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