Impact of damper seal coefficients in rotor dynamics : uncertainties and optimization

Detalhes bibliográficos
Ano de defesa: 2018
Autor(a) principal: Silva, Raphael Timbó
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: eng
Instituição de defesa: Universidade Federal do Rio de Janeiro
Brasil
Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia
Programa de Pós-Graduação em Engenharia Mecânica
UFRJ
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: http://hdl.handle.net/11422/12150
Resumo: Damper seals can have a significant impact on rotor dynamics, but the calculation of the stiffness and damping coefficients for this component can be challenging and has a high uncertainty. In the present work, a probabilistic model is proposed to model the seal coefficients, which are frequency-dependent. We develop a stochastic process (frequency indexed) so that the uncertainty in the model is taken into account. The impact of these uncertainties on the rotordynamic behavior of a compressor is analyzed. The deterministic coefficients of the seal are determined considering a bulk-flow model and values calculated by a compressor vendor based on the extrapolation of experimental data. The obtained results show that the uncertainty of these coefficients have a considerable impact on the compressor rotordynamic behavior, affecting the stability margin and the unbalance response. Based on this analysis, a procedure for the robust optimization of the compressor rotordynamic behavior is proposed. This procedure considers the seal geometric parameters as design variables. The results for the robust optimization show that the seal length and the cell hole depth can be modified to improve the unbalance response.