Graduate Thesis Or Dissertation
 

Acoustic switching of pneumatic turbulence amplifiers

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  • An experimental study was made of acoustic switching of pneumatic turbulence amplifiers. The development of fluidic devices was generally reviewed, and the operation of the pneumatic turbulence amplifiers made for testing was described. The characteristics of the turbulence amplifiers were experimentally determined and found to be typical for this type of device. Two acoustic switching devices, the sonic vibrating reed and the acoustic resonance sensor, were introduced. The vibrating reeds vibrated at their natural frequency to interrupt the control jet of a turbulence amplifier and the acoustic resonance sensor interrupted the control jet, when resonance occurred in the resonator chamber. Both devices produced turbulence amplifier switching when excited by proper acoustic signals. Their basic response characteristics were determined. The vibrating reeds produced satisfactorily switching at signal resonance frequencies between 40 to 100 cycles per second, while the resonance sensors operated between 400 and 2000 cycles per second. The response time for both switching devices was found to be approximately 0.24 second. Further work is necessary to demonstrate satisfactory switching when the acoustic signals contain tones of several frequencies.
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  • File scanned at 300 ppi using Capture Perfect 3.0 on a Canon DR-9050C in PDF format. CVista PdfCompressor 5.0 was used for pdf compression and textual OCR.
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