管路理論を適用した圧力測定孔の動特性

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This paper deals with the sensing error characteristics due to dynamics of a cavity-mounted pressure sensor connected with a relatively long narrow sensing hole. The sensing system is modeled as a transmission pipeline terminated by the impedance containing not only the cavity capacitance but also compensating effects of the sensing “orifice”, that is, the nonlinear resistance and the end correction inertance, inserted before the capacitance. The model is named as a “conduit model”, including the frequency-dependent laminar friction of flow, which is compared with the system neglecting the orifice characteristics. The sensor output is computed for the system subjected to the input true signal in the time domain adopting the method of characteristics. The simulated outputs are in excellent agreement with the experimental data for sinusoidal and step inputs over wide practical ranges of the conduit size, the signal frequency and amplitude.
2007-09-15