Vibration Attenuation of Periodic Non-uniform Pipes Conveying Fluid

Introduction Because the fluid-conveying piping system has a wide range of engineering applications such as mechanical, civil, astronautical and aeronautical engineering and so on, the vibration control is very necessary due to possible damage to the pipe system caused by vibration. This paper presents a vibration reduction scheme of pipeline conveying fluid which can reduce vibration effectively. Objectives By coupling the Bragg scattering bandgap mechanism with the inertia amplification mechanism, a strategy to enhance the bandgap properties of the periodic non-uniform pipes conveying fluid is proposed. Methods The band structures for flexural waves in the fluid-conveying periodic non-uniform pipes with periodically distributed inertial amplification mechanisms are determined using the transfer matrix method, and the frequency ranges of the bandgaps and vibration reduction are analyzed. Results The vibration attenuation capacity of the periodic non-uniform pipes under different fluid velocities, amplification masses and amplification angles is investigated. The bandgaps of the non-uniform pipe conveying fluid with periodic inertial amplification mechanisms obtained by the numerical method are compared with the vibration experiments. The results show that the piping systems with the design of the periodic pipe structures can be effective in reducing vibration. Conclusion The fluid velocity has slight effect on the band-gap properties of the non-uniform fluid-conveying pipes with periodic inertial amplification mechanisms. The band-gap properties and vibration attenuation performance of the non-uniform fluid-conveying pipes with periodic inertial amplification mechanisms can be enhanced more efficiently by a larger amplification angle and amplification mass.