A fluidic voice communication system and data link
Drzewiecki, Tadeusz M.
Nunn, R. H.
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This thesis presents a comprehensive dynamic analysis of fluidic laminar proportional amplifiers (LPA) and a subsequent design of a broad-band voice communication system and narrow-band data link that demonstrates the utility of the analysis. Starting from first principles, the governing equations for the lumped parameter representation of the various flow regimes found in an LPA are derived. From these governing equations, in the Laplace domain, equivalent electrical circuits are derived. The input of the LPA is determined to have a fifth order impedance. The transmission of the signal from input to output is delayed by a transport time, determined both phenomenologically and experimentally, to be twice the average particle transit time. A pressure is developed at the output that is dependent on the loading and the vent conditions. This pressure is acoustically fed back to the control region of the jet, augmenting jet deflection when in phase. The vent inductance has the effect of producing a low frequency hump on the Bode plot. The regions of enhanced gain correspond almost exactly to the edge-tone Eigen frequencies reported in the literature and as such the theory developed herein may be used to predict not only the ratios of Eigen frequencies but also their actual values, Experiments have shown good agreement between theory and data for the amplitude frequency response of LPA's and excellent agreement for their phase shift. Using the analysis as a tool, an engineering guide was developed for the dynamics characteristics of LPA's especially the HDL STD MOD 188.8.131.52. Operating bandwidths of grater than 14 kHz can be expected for amplifiers with a nozzle width of 0.25 mm. Ultrasonic operation is feasible with smaller devices.
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