Fuzzy velocity controller design for a pipeline inspection gauge

In this paper, we introduce a fuzzy logic controller for pipeline inspection gauge (PIG) flow in gas pipeline. The velocity control is done through changing the amount of bypass flow in PIG main body. For dynamic Modelling of system we must consider four fundamental dynamics: dynamic of natural gas flow behind the PIG and in front of the PIG, dynamic of bypass flow and dynamic of Pig's main body. Effectiveness of the designed Pig fuzzy velocity controller (PFVC) has been proved through simulations that have been done for the case that PIG is launched into the pipe. For a better comparison, a PID controller has been designed. Results show that fuzzy controller, can appropriately control the PIG flow in the pipe.

Keywords:

fuzzy control pipeline , inspection gauge , pipeline pigging , velocity control