Digital Effects in Hardware-in-the-Loop Experiments of Stick-Slip Phenomena

Abstract eng:
The topic of this study is the analysis of one degree of freedom (DoF) oscillatory systems subjected to the friction force generated at moving surfaces of mixed dry and viscous friction. The stick-slip phenomenon arising on partially lubricated surfaces can be critical in many engineering systems. This study aims to present the theoretical considerations behind the use of the hardware-in-the-loop (HIL) method and to report on possible experimental implementation. We compare the results of the global dynamical analysis with the numerical results of the simulations. The mathematical model of the HIL experiment considers idealised control, but takes into account the delay related to the digital effects like sampling. The analytical and numerical analysis of the corresponding discrete model leads to results validated by the measurements. The conclusions of the theoretical, numerical and experimental study call the attention on the limitations of HIL experiments when the system is strongly nonlinear.

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