[pt] A Dissertação aqui apresentada descreve um acidente em um
rotor de máquina de grande porte (compressor de ar) de uma
fábrica de fertilizante cujas conseqüências foram perdas
financeiras de alta monta tanto para a empresa quanto para o
Estado, pela importância econômica onde a fábrica
é situada. O objetivo da Dissertação foi simular
matematicamente o acidente ocorrido e esclarecer o mesmo.
Para se chegar ao diagnóstico do problema se modelou o rotor
e o discretizou pelo Método de Elementos Finitos. As
técnicas de investigação do problema e a sua seqüência de
investigação podem ser tomadas como base em investigação de
eventuais acidentes envolvendo rotores futuramente. O
capítulo relativo a Análise Modal será extraído como base de
apostila para curso envolvendo pessoal da área de
Manutenção Mecânica. / [en] A problem related with an air compressor gave birth to the
MSc Thesis. Problems related with rotative machines are
usual in the industrial field. Difficulties come from the
data gathering in order to analyze, and propose
a theory of failure in order to explain and avoid the
recurrence of such problem. Modelling a rotor with a
Timoshenko beam element and the discretization by finite
element method permit the dynamical analysis and
the modal analysis of the rotor considering its interaction
with the radial and thrust bearings (assuming stiffness and
rigidity). The work is divided in seven chapters: chapter
one introduces the work and gives the overview
of it; chapter two describes the industrial problem; chapter
three is a brief explanation of bearing types and the
fundamental principle of lubrication; chapter four
introduces vibration theory and modal analysis; chapter five
introduces the finite element method; chapter six is the
simulation of the problem, using tailor-made MATLABr
programs to reconstruct the problem and to compare the test
field results with the here mentioned formulation; chapter
seven discusses the results and proposes future works.
Appendix shows the kinetic theory and the beam deformation
model used in the program and the Laval simple rotor as a
limited description of the dynamic of a rotor with
distributed mass, rigidity and stiffness. The aim
of this work is to help understand and avoid the recurrence
of the failure described and to easy the understanding of
modal analysis for new engineers and technicians which will
deal with rotor dynamics.
| Identifer | oai:union.ndltd.org:puc-rio.br/oai:MAXWELL.puc-rio.br:11885 |
| Date | 09 July 2008 |
| Creators | RICARDO E SILVA DE SANT ANNA |
| Contributors | RUBENS SAMPAIO FILHO |
| Publisher | MAXWELL |
| Source Sets | PUC Rio |
| Language | Portuguese |
| Detected Language | English |
| Type | TEXTO |
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