This article presents a method to experimentally estimate the direct and cross-coupled dynamic coefficients of tilting-pad journal bearings of vertical hydro-generators and other similar rotating machinery for damage detection purposes. Based on a simplified second-order model of a journal bearing in the state-space, the method employs only the usually monitored vibrations, the shaft radial relative, and the bearing radial absolute vibrations originated by the hydro-generator residual unbalance or by hydraulic excitations in the turbine rotor. This article shows that the method was successfully tested using the shaft and bearing vibration signals synthesized by a mathematical model of a 700 MW hydro-generator, even when these signals are contaminated with random noise. This article also shows the method’s performance when applied to real vibration signals acquired from the modeled hydro-generator. Finally, it discusses the possible measures to improve the method’s efficiency.
O Grupo Cataratas de Eficiência Energética (GCEE) é constituído por docentes e discentes do CECE da Unioeste - Foz do Iguaçu, e tem por finalidade enriquecer a formação de seus integrantes por meio de atividades de projeto, construção e manejo de veículos para competições de eficiência energética para veículos movidos à energia elétrica e etanol. A equipe já participou de diversas competições sendo a detentora do recorde latino-americano na categoria etanol (736 Km com um litro de etanol).
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