A New Simulation Method for the Transient Responce of Composite Fluid Line Systems (lst Report, Basic Computation Techniques and Obtained Waveforms of the Step Response)

摘要

A new simulation method for obtaining the transient response of composite fluid line systems, such as city gas transport networks, air brake systems, pressure instrument lines and fluid control systems, has been presented. This method is based on the wave diagram of traveling waves in the system, Brown's approximate step response of semi-infinite lines, and the reflection and transmission coefficients at all joins and ends in the system. It is shown that the output pressure at any point of the fluid line system to a transient input can be expressed as the sum of the pressure of the infinite wave series traveling through the output point. Each term of the series is made up the product of "the pressure of simple wave" and "the function of reflection and transmission coefficients at the joins and ends in the system". The pressure of simple wave, the function of reflection and transmission coefficients, and the arrival time of each wave to the output point are computed by the wave diagram simulation of the fluid line system, and the output pressure is obtained by these quantities.