Finite Element Analysis for Piezoelectric Transducer and Low Frequency Organ Pipe Projector
Date Issued
2010
Date
2010
Author(s)
Kuo, Chang-Wei
Abstract
This study use finite element analysis to discuss mechanical、electrical and
acoustical characteristics of the piezoelectric transducer. Mechanical and electrical
characteristics are concerning the influence of electromechanical coupling coefficient
and resonance frequency under different D/T ratio. It is also concerning the influence
of vibration behavior and mechanical quality factor when adding different backing
layers.
In acoustical characteristics, this study use the circular piston directivity function
to discuss the differences of directivity and side lobe generated under different
excitation frequency. It also use finite element simulation to verify the result. When
piezoelectric disk vibrating, it will produce the normal acceleration on the disk
surface. This degree of freedom to pass on the fluid medium, it will produce sound
pressure distribution in the fluid space.
Finally, this study tries to design and simulate an underwater flow measurement
transducer, which called Low Frequency Organ Pipe Projector. Transducer sound
source can be generated by the radial vibration of piezoelectric ceramic transfer into
the metal plate bending motion. It can enlarge vertical displacement of the metal plate
to generate greater sound output. However, the frequency generated by the transducer
has relationship with tube length. This study tries to determine optimal tube length
and discuss the differences of sound pressure which generated by ideal sound source
and non- ideal sound source.
Subjects
finite element method
mode shape
electromechanical coupling coefficient
mechanical quality factor
backing layer
directivity
low frequency organ pipe projector
Type
thesis
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