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2 Journal of Theoretical and Applied Mechanics

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A study of dynamic hysteresis model for a magnetorheological damper

Chen Kun-Yung, Kung Ming-Lung

Journal of Theoretical and Applied Mechanics

2023

Vol. 61 nr 2

259--274

The paper proposes a new dynamic model based on the LuGre model and an electrical equation to describe the hysteresis phenomenon for a magnetorheological (MR) damper. In addition, a sliding mode observer (SMO) is proposed to estimate unmeasurable states of the MR damper. The parameters of the MR damper are successfully identified by using the self-learning particle swarm optimization (SLPSO) algorithm. The contributions of this paper are: i) a new dynamic model based on the LuGre model and an electrical equation for an MR damper is successfully formulated to fit for the hysteresis behavior, ii) the exerted damping force can be practically adjusted by using input voltage for the dynamic model, iii) the SMO is proposed to estimate the internal states and current, and iv) the unknown parameters of the MR damper are successfully identified by using the SLPSO algorithm with a numerical experiment.

Experimental and numerical analysis of stick-slip suppression with the use of longitudinal tangential vibration

Rybkiewicz Marta, Gutowski Paweł, Leus Mariusz

Journal of Theoretical and Applied Mechanics

2020

Vol. 58 nr 3

637--648

The results of experimental tests and numerical simulation analyses of the possibility of partial reduction or entire elimination the stick-slip phenomenon in sliding motion through introduction of longitudinal tangential vibrations to the contact zone of a shifted body and the substrate are shown in the paper. The experimental tests were carried out on a specially designed stand. In the computational model, the dynamic equation of motion of the shifted body was used, and for the friction force description the LuGre model was adopted. A excellent consistency of the experimentally determined results with those calculated with the use of the developed model is obtained.