09/02/2022
LVA CONVIDA: Defesa de Mestrado!
Convidamos todos a comparecer à defesa de doutorado de um discente participante do LVA, Diego Martin Tuozzo, mestrando orientado pelo Professor Arcanjo Lenzi, com a dissertação: On the use of FETM for time-harmonic analysis of acoustic wave propagation in gas pipeline systems with focus on low-frequency acoustically induced Vibration
Segue o resumo: Structural vibration of gas pipeline systems can strongly be affected by the response of the acoustic domain represented by the gas being transported through pressurized pipes, cylinders and other related components. The resultant Acoustically Induced Vibration (AIV) can be a cause of failure, for example, in reciprocating compression systems. In this article, a procedure based on analytical plane wave solutions for 1D dissipative linear acoustics considering cylindrical rigid wall waveguides, with and without containing a mean flow, is investigated aiming to model the internal Pressure field of pipeline systems. The Finite Element Transfer Method (FETM) is implemented to numerically solve the resultant time-harmonic acoustic problem, whose results can be used to analyze the causes of an AIV problem or even as excitation for structural analysis of low frequency vibrations in piping structures. Four different damping models are presented (apart from the classical undamped model) resulting in five diferente acoustic elements for the quiescent fluid case. In addition, two different damping models are analyzed for the case of a fluid with a mean flow and implemented through two proposed flow-acoustic elements. The physical behavior of certain typical geometries junctions is also investigated, implemented through acoustic and flowacoustic length corrections. In addition, a discussion related to the minimum and maximum FETM element size is presented. The effectiveness of the whole FETM strategy is verified using a variety of representative gas pipeline geometries as application examples with a particular set of boundary conditions for quiescent and moving fluid medium. Nodal pressure frequency plots of cases considering all the proposed acoustic and flowacoustic elements, and related damping models, are presented. Coherent results were achieved using the proposed procedure when frequency plots are compared with experimental data and 3D FEM equivalent models.
Compareça! A defesa irá ocorrer nesta quinta-feira (10/02), às 09h através do link: https://us06web.zoom.us/j/89614923115?pwd=ZFdtUW0wQjA0ZnBKcEtCM0R4bHAxZz09
Venha prestigiar mais uma excelente pesquisa do nosso LVA! 🧑🎓