NOLISYS is the result of more than 15 years of research at the University of Liège in the field of nonlinear vibrations carried out under the supervision of Professor Gaëtan Kerschen.

Over the years, theoretical, computational and experimental methods have been developed. They have now reached the necessary maturity to be applied to large-scale structures vibrating in weakly or strongly nonlinear regimes of motion.

Nonlinearity is a frequent occurrence in engineering structures: elastomeric materials, gaps, gears, friction. It introduces distortions in frequency response functions and can make your stabilization diagram difficult to interpret. In addition, nonlinearity can induce new phenomena with no linear counterpart such as modal interactions and bifurcations.

Created in 2016, NOLISYS is a startup active in the field of nonlinear vibrations. It is the result of more than 15 years of research carried out under the supervision of Professor Gaëtan Kerschen at the University of Liège, in Belgium.

Building on advanced experimental and computational techniques, the competence and activities of our group focus on the detection of nonlinearities in measurement data and the assessment of their impact on the structure's dynamics. Our technologies power nonlinear test campaigns and simulations with applications in aerospace, automotive, civil and mechanical engineering.

NI2D Software

Thanks to its experimental capabilities, the NI2D® software allows the analyst to quickly and robustly identify nonlinear phenomena during vibration test campaigns. Starting from data measured using accelerometers and/or laser vibrometers, the NI2D® software can detect (yes or no?), locate (where?), visualize (what?) and estimate (how much?) nonlinearities.

Based on a hybrid nonlinear modeling of the structure, the NI2D® software also calculates nonlinear time responses, nonlinear vibration modes, nonlinear resonance frequencies and bifurcations through innovative algorithms. These nonlinear features provide a clear and immediate view on the impact of nonlinearities on the dynamical properties of the structure, for predictive and design purposes.

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