Analysis of pneumatic pipeline using CCUP (CIP-combined and unified procedure) method

Dynamic analysis of pneumatic transmission line which is widely used in industry is important. In this paper, numerical analysis of pneumatic pipeline as a distributed observer is performed to shorten the short computation time for applying to a real time control. The CCUP (CIP-combined and unified procedure) method which is a kind of the CIP (Cubic-interpolated pseudo particle) method using implicitly-defined pressure equation is employed. The CCUP method enables to use larger time increments than the CIP method since the CFL (Courant-Friedrichs-Lewy) condition of sonic speed can be ignored. Therefore, a reduction in computation time can be expected. The pressure response of a pneumatic pipeline with a step input is measured experimentally as a candidate for this paper. The computation results of pneumatic pipeline with the CCUP method are evaluated and compared with those of the experiment, the first order upwind difference scheme and the CIP method. The comparison of the computation time shows that the CCUP method has the shortest computation time given a suitable convergence condition.