New simulation method for transient response of composite fluid line systems - (Effective computation techniques and step responses of multiline systems)

In the first report on this subject, a new simulation method for obtaining the transient response of composite fluid line systems, such as gas transpo rt networks, air brake systems, pressure instrument lines and pneumatic con trol systems, has been presented. This simulation is based on the wave diag ram of the fluid line system and Brown's approximate step response of a sem i-infinite line. In this report, two kinds of wave reduction techniques are introduced for the effective computation of the transient response. One is the unification of equivalent and similar waves at any junction of lines f rom different traveling routes. The other is the elimination of small waves attenuated by the partial reflection and the long propagation distance. Fo r computed response examples using these techniques, the step responses of composite fluid line systems (a loop line system and multiline branching sy stems) are also presented.