On the single pulse transmission in pneumatic lines.

概要

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This paper is primarily directed toward analyzing the single pulse response in pneumatic lines.The exact solution to the single pulse response was obtained by using the complicated transfer function derived by Iberall, and compared with the approximate one which was derived from the Brown's approximate transfer function. The discrepancy with the exact and the approximate is small, so the approximate solution is adopted to compare the experimental result with the theoretical one.In this experiment, the input signal was generated by the single pulse generator with the disc chopper. In order to compare the theoretical wave forms with the experimental ones, the traces obtained from the oscilloscope were photographed. The diameter, the length of lines, and input pressure amplitude were varied to investigate their effects. As the input signal wave form was not rectangular but rather trapezoidal, the analysis for trapezoidal input was also presented. Experimental result shows the fairly good agreement with the theory based on the trapezoidal input.As a result, it is found that the Brown's approximate transfer function is very useful in analyzing the transient response of pneumatic lines. Furthermore, in this experiment, the effect of the input pressure amplitude (3.2, 4.8, 6.4kPa) was not observed.
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