Research

Research interests

My research interests focus on theoretical, experimental and numerical contributions in the field of mechanical systems and structural dynamics.

My contributions include work based on highly efficient experimental and computational methods for physics and engineering, aiming to improve the understanding of the dynamic behavior of mechanical systems in various technology fields including automotive systems and aero-engines.

My research topics fall into the following broad categories:

  • Nonlinear vibrations

  • Noise and friction-induced vibration

  • Damage detection and structural health monitoring

  • Rotordynamics

Some illustations can be found here.

Nonlinear vibrations :

  • Complex structures with localised nonlinearities

  • Nonlinear methods for calculating the transient or/and quasi-periodic responses of nonlinear mechanical systems

  • Modeling of localized nonlinearities (friction interface, bolted junction, contact, elastomer, breathing crack,...)

  • Efficient modal reduction in non-linear dynamics

  • Uncertainty effects on the variability of the nonlinear responses in mechanical systems

  • Correlation between experiments and numerical analysis



Noise and friction-induced vibration :

  • Stability and bifurcations of solutions

  • Non-linear analysis for mechanical systems subjected to friction-induced vibration and noise

  • Solving processes for investigation of the nonlinear transient and stationary behaviors of mechanical systems

  • Numerical methods for calculating squeal noise and acoustic radiation

  • Modeling of contact interaction with friction

  • Modal reduction for structures with frictional interfaces

  • Uncertainty effects on the variability of the stability and nonlinear responses

  • Correlation between experiments and numerical analysis



Structural health monitoring:

  • Modeling of crack and breathing behavior

  • Linear and non linear approaches for crack detection and identification in fixed and rotating systems

  • Vibration analysis of fixed and rotating systems with breathing crack

  • Experimental tests for crack detection in rotating systems



Rotordynamics :

  • Modeling of rotating machinery

  • Multi-faults (such as unbalance, asymmetric shaft, bow, parallel and angular misalignments, ...)

  • Instabilities

  • Reduced-order models

  • Nonlinear vibration for mono and multi-excitations

  • Uncertainty modeling and stochastic process in linear or nonlinear rotor systems

  • Correlation between experiments and numerical analysis



Applications :

  • Brake systems (automotive, railway, aircraft,...), clutch, wipers,...

  • Transport

  • Turbomachinery

  • Aerospace

  • Aeronautics

  • Civil engineering

  • ...

Experimental bench FIVE@ECL

Since 2015, design of a new experimental test bench, called Friction-Induced Vibration and noisE at Ecole Centrale Lyon (FIVE@ECL), has been developped by the research group "Nonlinear Dynamics, Uncertainties, Mechanical Systems with Interfaces".

Financial supports from Institut Universitaire de France (IUF) and Institut Carnot Ingénierie@Lyon.

To be noted for the scientific community in the field of friction-induced noise and vibration : free experimental databases are available.

Contact me for more information: jean-jacques.sinou@ec-lyon.fr

Experimental studies for different configrations of brake system are under studied and some of the open issues in understanding squealing disc brakes are ongoing :

    • Experimental studies for different configurations of brake system and various operating conditions

    • Noise generation and suppression in brake part design

    • Correlations with numerical simulations based on finite element models

    • Studies of the contributions of each of the components depending on the squealing frequency of interest

    • Detection of the distinct frequencies and the amplitude of vibration of squealing brake

    • Links between the vibration of a squealing disc brake assembly and the squeal noise

    • Developments of some specific experimental tests for friction-induced vibration and noise prediction

    • ...


  1. J-J. Sinou, D. Lenoir, S. Besset and F. Gillot, Squeal analysis based on the laboratory experimental Bench "Friction-Induced Vibration and noisE at Ecole Centrale de Lyon" (FIVE@ECL), Mechanical Systems and Signal Processing, 119, 561-588, 2019. doi.org/10.1016/j.ymssp.2018.07.006

  2. J-J. Sinou, D. Lenoir, S. Besset and F. Gillot, Dataset of vibrational and acoustic measurements for squeal analysis from the laboratory brake setup Friction-Induced Vibration and noisE at Ecole Centrale de Lyon (FIVE@ECL) , Data In Brief, 21, 639-643, 2018. doi.org/10.1016/j.dib.2018.09.083

  3. D. Lenoir, S. Besset, and J-J. Sinou, Transient vibro-acoustic analysis of squeal events based on the experimental bench FIVE@ECL, Applied Acoustics, 165, 107286, 2020. doi.org/10.1016/j.apacoust.2020.107286

  4. J-J. Sinou, D. Lenoir and S. Besset and F. Gillot, Some unexpected thermal effects on squeal events observed on the experimental bench FIVE@ECL, Mechanical Systems and Signal Processing, in press, 2021.

Download free datasets

Free datasets for Friction-Induced Vibration and noisE are available:

  1. J-J. Sinou, D. Lenoir, S. Besset and F. Gillot, Dataset of vibrational and acoustic measurements for squeal analysis from the laboratory brake setup Friction-Induced Vibration and noisE at Ecole Centrale de Lyon (FIVE@ECL) , Data In Brief, 21, 639-643, 2018. doi.org/10.1016/j.dib.2018.09.083


Free datasets for the experimental CEA-beam benchmark structure are available:

  1. M. Claeys, J-P. Lambelin, Y. Chatereau J-J. Sinou, Dataset of multi-harmonic measurements for the experimental CEA-beam benchmark structure, Data In Brief, 27, 104563, 1-6, 2019. doi.org/10.1016/j.dib.2019.104563

  2. T. Roncen, J-P. Lambelin, Y. Chantereau and J-J. Sinou, Dataset of measurements for the experimental CEA-beam benchmark structure subjected to one stochastic broadband excitation, Data In Brief, 35, 106798, 2021. doi.org/10.1016/j.dib.2021.106798

Research group "Nonlinear Dynamics, Uncertainties, Mechanical Systems with Interfaces"

Overview

The research group "Nonlinear Dynamics, Uncertainties, Mechanical Systems with Interfaces" (Laboratory of Tribology and Dynamics of Systems UMR CNRS 5513) is focused broadly on mechanical science and technology in order to conduct specific research and investigations into vibration problems for industry as well as the public sector. Research interests focus on theoretical, experimental as well as numerical contributions.

We are committed to realizing our research program through studies currently focused on five major areas:

  • Uncertainty effects on the variability of the nonlinear vibrations of complex structures with localised nonlinearities

  • Noise and friction-induced vibrations with application to brake squeal

  • Finite element modeling and numerical simulations of nonlinear vibrations

  • Modal reduction for complex structures with localized nonlinearities

  • Efficient optimization design method for the prediction of nonlinear vibrations


People - permanent researchers and faculty members

The research group "Nonlinear Dynamics, Uncertainties, Mechanical Systems with Interfaces" includes a number of permanent researchers and faculty members and often involves PhD-students and post-doctoral researchers.