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Palestrante: DSc. Roberta de Queiroz Lima, Depto. de Eng. Mecânica, Pontifícia Universidade Católica - PUC

Data: Sexta-feira, 15/07/2016

Horário: 13:30 horas

Local: Centro de Tecnologia Bloco I, Sala: I-241

https://seminariospdpemblog.wordpress.com/

ABSTRACT:  We study the the dynamics of a dry-friction oscillator driven by a stochastic base motion. The system consists of a simple oscillator (mass-spring) moving on a base with a rough surface. This roughness induces a dry-frictional force between the mass and the base which is modeled as a Coulomb friction. It is considered that the base has an imposed stochastic bang-bang motion which excites the system in a stochastic way. The non-smooth behavior of the dry-frictional force associated with the non-smooth stochastic base motion induces in the system stochastic stick-slip oscillations. A statistical model is constructed for the stick-slip dynamics of the system. The objective is to characterize, from a statistical view point, the response of the dry-friction oscillator composed by a sequence of stick and slip-modes. Defined a time interval for analysis, some of the variables which appear in this statistical model are the number of time intervals in which stick and slip occur, the instants at which they begin and their duration. These variables are modeled as stochastic objects. Statistics of them, as mean and variance, histograms, and entropy are computed by the integration of the dynamics equations of the system using independent samples of the base movement generated with the Monte Carlo method.

Síntese Biográfica: Possui graduação e mestrado em Engenharia Mecânica pela Pontifícia Universidade Católica do Rio de Janeiro e duplo-diploma de doutorado em Engenharia Mecânica pela Université Paris-Est-Marne-la-Vallée e pela Pontifícia Universidade Católica do Rio de Janeiro. Atualmente é Professora Assistente do Departamento de Engenharia Mecânica da Pontifícia Universidade Católica do Rio de Janeiro. Tem interesse nas áreas de modelagem estocástica, dinâmica de estruturas, mecânica computacional, sistemas acoplados, otimização robusta, colunas de perfuração de petróleo, atrito seco.

 

 

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