An investigation of the physical characteristics of a mass element resonator.

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Author
Grant, Larry Allan
Date
1992-03Advisor
Hofler, Thomas J.
Second Reader
Keolian, R.
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Show full item recordAbstract
This thesis investigates the characteristics of an acoustic resonator with a
passive mass element. The mass element is substituted as an impedance
matched replacement for a section of gas-filled half wavelength resonator
tube. The mass element consists of a disk bonded to a Servometer electroformed
single convolution nickel bellows. The bellows can be modelled as a
circular plate with a spring supported boundary placed in the acoustic center
of a resonator between two equivalent gas springs driven by a loudspeaker.
Loading changes were used to characterize the bellows' motional response to
different drive conditions for the frequency range near the first resonance of
the system. The response of the system was highly nonlinear for nearly all
the configurations despite minimal loudspeaker drive levels. The nonlinear
response was a consequence of the coincidence of the resonant frequencies for
several modes of the bellows, particularly two prominent modes - an expected
piston-like mode, and an unexpected rocking mode. Attempts were made with varying success to achieve high amplitudes for the piston mode,
which is important for its use in a new generation Thermoacoustic Refrigerator.
The new refrigerator design will utilize the mass element to reduce
those acoustic losses that are a parasitic heat load on the cold end of the
refrigerator, as well as make the resonator more compact.
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