The Finite Element Technique for Modelling of Pipe System Vibroacoustical Characteristics

In this paper, we consider two finite element techniques developed by the authors earlier for the solving differential equation systems of the complex configuration pipelines dynamics and compare calculation results with experimental data. One of the techniquies uses the new type of seven node finite elements for modeling vibroacoustical interaction between solid structures and oscillating fluid, another - two node finite elements. The proposed finite element techniques allow calculation of pipe vibroacoustical characteristics in the space-time domain. Because these techniques use the new element types, the computational coast is 3 orders less than for available finite element techniques, which use different element types for a fluid and a solid structure. The developed techniques are designed for a pipeline diameter much smaller than an acoustic wavelength in a fluid. The experimental research was conducted for the pipe system of the hydraulic test bench for generating pressure pulsation. The results of calculation by the proposed finite element techniques were confirmed by experimental data.