Abstract: By introducing a kinetic friction factor into the conventional sectional concentrated-parameter model for hydraulic pipelines, a new even-sectional concentrated-parameter model using bond graphs is worked out. Then the expression of the kinetic friction factor is determined by comparing the simulation results of this new model with those of the distributed-parameter model. Experimental results have proved the new model to be true. The new model has a visual physical process, and less calculated parameters and higher capacity of simulation than any other models, so it is suitable for application in engineering.

Key words: Bond graph models, Concentrated parameter model, Kinetic friction factor, Pipe dynamic