Open Source Software for Pulsation Analysis of Pipeline Systems

DOI: 10.18462/iir.compr.2024.0616

Sekcia: Compressors and technologies

Stav prijatia: Abstrakt prijatý

Autori

Abstrakt

In refrigeration systems, the structural vibration behavior of metallic pipes as those found in condensers and evaporators can be strongly affected by the response of the acoustic domain represented by the gas being transported through pressurized tubes, pipes, cylinders and other related components. The resultant Acoustically Induced Vibration (AIV) can be a cause of vibration and noise, for example, in the discharge and suction lines. In this work, the authors present a strategy based on the acoustic Transfer Matrix Method (TMM) and on the Timoshenko beam theory to represent the referred acoustic-structure interaction in gas pipelines as a weakly coupled system, modeled by the Finite Element Method (FEM). By this way, it is possible to predict the dynamic behavior of pipe systems subjected to harmonic acoustic loads, with excitation frequencies similar to the harmonics within typical compressors pulsation’s spectra. An open source code called OpenPulse was developed in Python, which firstly solves the 1D linear acoustic problem using a TMM-based procedure – the Finite Element Transfer Method (FETM) – and, after, uses the resultant internal pressure field as the load case for the pipe vibration problem (one-way coupling), which in turn is solved by FEM (Timoshenko 3D-beam elements). The effectiveness of this strategy is presented using an example application. Displacement, stress and pressure fields are shown in 3D graphs and associated with frequency plots of the referred measures for several load cases and constraints. Coherent results were achieved using the proposed procedure.

Kľúčové slová

pulsation
vibration
pipes
finite element