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View article: Experimental study of a drill-string test rig and the construction of torsional stability maps
Experimental study of a drill-string test rig and the construction of torsional stability maps Open
This paper presents an experimental study of a test rig designed to emulate drill-string dynamic phenomena and construct torsional stability maps. The primary objective is to analyze the torsional vibration of a slender shaft subjected to …
View article: Domain Adaptation of Population-Based of Bolted Joint Structures for Loss Detection of Tightening Torque
Domain Adaptation of Population-Based of Bolted Joint Structures for Loss Detection of Tightening Torque Open
This paper investigates how to improve the performance of a classifier of tightening torque in bolted joints by applying transfer learning. The procedure uses vibration measurements to extract features and to train a classifier using a Gau…
View article: Uncertainty quantification in mechanistic epidemic models via cross-entropy approximate Bayesian computation
Uncertainty quantification in mechanistic epidemic models via cross-entropy approximate Bayesian computation Open
This paper proposes a data-driven machine learning framework for parameter estimation and uncertainty quantification in epidemic models based on two key ingredients: (i) prior parameters learning via the cross-entropy method and (ii) updat…
View article: Impact-Aware Task-Space Quadratic-Programming Control
Impact-Aware Task-Space Quadratic-Programming Control Open
International audience
View article: Uncertainty quantification in mechanistic epidemic models via cross-entropy approximate Bayesian computation
Uncertainty quantification in mechanistic epidemic models via cross-entropy approximate Bayesian computation Open
This paper proposes a data-driven machine learning framework for parameter estimation and uncertainty quantification in epidemic models based on two key ingredients: (i) prior parameters learning via the cross-entropy method and (ii) updat…
View article: Uncertainty quantification in mechanistic epidemic models via cross-entropy approximate Bayesian computation
Uncertainty quantification in mechanistic epidemic models via cross-entropy approximate Bayesian computation Open
This paper proposes a data-driven approximate Bayesian computation framework for parameter estimation and uncertainty quantification of epidemic models, which incorporates two novelties: (i) the identification of the initial conditions by …
View article: ABC for model selection and parameter estimation of drill-string bit-rock interaction models and stochastic stability
ABC for model selection and parameter estimation of drill-string bit-rock interaction models and stochastic stability Open
The bit-rock interaction considerably affects the dynamics of a drill string. One critical condition is the stick-slip oscillations, where torsional vibrations are high; the bit angular speed varies from zero to about two times (or more) t…
View article: A cross-entropy approximate Bayesian computation framework for uncertainty quantification on mechanistic epidemic models
A cross-entropy approximate Bayesian computation framework for uncertainty quantification on mechanistic epidemic models Open
International audience
View article: Complete modeling of hydrodynamic bearings with a new approach to limit parameterization
Complete modeling of hydrodynamic bearings with a new approach to limit parameterization Open
The present work aims to revisit the simplifications made in the Navier-Stokes equations for the flow between two cylinders with a small thickness of lubricating oil film. Through a dimensionless analysis, the terms of these equations are …
View article: Complete modeling of hydrodynamic bearings with a boundary parameterization approach
Complete modeling of hydrodynamic bearings with a boundary parameterization approach Open
The present work aims to revisit the simplifications made in the Navier-Stokes equations for the flow between two cylinders with a small thickness of lubricating oil film. Through a dimensionless analysis, the terms of these equations are …
View article: ROSS - Rotordynamic Open Source Software
ROSS - Rotordynamic Open Source Software Open
There are several categories of critical rotating equipment crucial to industry, such as compressors, pumps, and turbines.Computational mechanical models aim to simulate the behavior of such mechanical systems and these models are used to …
View article: Stochastic modeling for hysteretic bit–rock interaction of a drill string under torsional vibrations
Stochastic modeling for hysteretic bit–rock interaction of a drill string under torsional vibrations Open
This paper aims at constructing a stochastic model for the hysteretic behavior of the nonlinear bit–rock interaction of a drill string under torsional vibrations. The proposed model takes into account the fluctuations of the stick–slip osc…
View article: Impact of Damping Models in Damage Identification
Impact of Damping Models in Damage Identification Open
Several damage identification approaches are based on computational models, and their diagnostics depend on the set of modelling hypotheses adopted when building the model itself. Among these hypotheses, the choice of appropriate damping m…
View article: Damage Identification in a Multi-DOF System under Uncertainties Using Optimization Algorithms
Damage Identification in a Multi-DOF System under Uncertainties Using Optimization Algorithms Open
In this study, four optimization algorithms are applied to identify the damage in a multi-DOF dynamical system composed of masses, springs, and dampers. The damage is introduced artificially by choosing a lower value for the stiffness. The…
View article: Active control of stick-slip torsional vibrations in drill-strings
Active control of stick-slip torsional vibrations in drill-strings Open
This paper presents active vibration control to reduce the stick-slip oscillations in drill-strings. A simplified two degrees-of-freedom drill-string torsional model is considered. The nonlinear interaction between the rock and the bit is …
View article: Estudo do Escoamento Viscoso entre Dois Tubos Simulando Selo de Máquinas Rotativas
Estudo do Escoamento Viscoso entre Dois Tubos Simulando Selo de Máquinas Rotativas Open
Para a melhor escolha dos parâmetros geometricos de maquinas rotativas, e importante um estudo da interacao fluido-maquina e consequentemente a determinacao das propriedades do fluido. Tais maquinas sao compostas, em geral, por um tubo ext…
View article: Stochastic fields to analyze uncertainties in laminated structures with viscoelastic core
Stochastic fields to analyze uncertainties in laminated structures with viscoelastic core Open
The process of polymeric materials production may lead to material heterogeneities.Therefore, the mechanical behavior of these materials may present unique characteristics from point to point.Nevertheless, this characteristic is rarely tak…