The pipe system has great application in many fields, such as the shipping driving system, aviation and spaceflight, nucleus industry and the blue water petroleum exploitation. There exists complex fluid and structure interaction in pipe systems that conveying fluid. The vibro-acoustic energy that caused by the fluid and structure vibrations of pipe systems not only emits undesirable noise pollution, but also paralyzes the pipe system and machines. The band gap of phononic crystals (PCs) has receive...