EDI's analysis technique allows simulation of simultaneous multiple cylinder and stage excitations, including the effect of interaction between piping characteristics and cylinders (the effect of pulsation on the suction and discharge valve timing).
All cylinder mechanical characteristics important to the simulation are considered, including single acting and double acting capability (valve unloaders), pocket volumes, crankshaft and cylinder phasing, cylinder rod and tail rod effects, and finite length connecting rod effects. Suction and discharge pressures, temperatures, and thermophysical properties are input as defined by the operating conditions and composition of the gas or liquid. Cylinder internal passage data (supplied by the manufacturer) is included as part of the piping network.
Any arbitrary compressor/pump speed range may be simulated. The piping system dynamic flow and pressure properties are calculated at each increment of compressor or pump speed. The increment of speed may be arbitrarily small, and is controlled to accurately define high "Q" (amplification factor) responses as required.
In addition to a "forced" piping response due to cylinder excitation, a "passive" (swept sine wave) frequency response capability is available, which is important for "tuning" the values of designer-controlled filter frequencies, accurately determining the Helmholtz frequencies of baffled bottles, and defining the different pulsation modes. This analysis technique is also used for evaluating resonant frequencies of flow excited branches in centrifugal compressor systems.
