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This paper deals with the design technique of pressure instrument line systems in time domain. By using the linear transmission line theory, following results are obtained. i) When the reflection coefficient at the sending point of line, m1, is equal to zero, the step response of the system does not overshoot. ii) The response waveform of the above system can be easily calculated. iii) The non-reflection condition m1=0 is approximately satisfid when the characteristic resistance of line is equal to the linearized resistance of choking nozzle at the sending point of line. iv) The delay time of the step response decreases effectively as the inner radius of line increases and the cavity volume decreases. The pressure instrument line systems are designed on the basis of the above results and the characteristics of these systems are evaluated by the experiment to negative step input using air as the operating fluid. As a consequence, the agreement between analytical and experimental responses is relatively good.

Design of Pressure Instrument Line Systems in Time Domain