Journal of Vibration Testing and System Dynamics
Mathematical Framework and NonLinear Modeling of the Mechanical System. Part I: Rigid Body Kinematics
Journal of Vibration Testing and System Dynamics 1(3) (2017) 267280  DOI:10.5890/JVTSD.2017.09.006
S. Haddout; M. Rhazi; S.E. Faik; A. Soukri
$^{1}$ Department of Physics, Faculty of Science, Ibn Tofail University, B.P 242, 14000 Kenitra, Morocco
$^{2}$ Department of Physics, Ecole Normale Sup´erieure, B.P 2400, 40000 Marrakech, Morocco
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Abstract
In the present paper, a problem of a free rigid body motion in mechanical system is analyzed from a video capture webcam (Sony Cybershot 10.1 M.P). The problem subjected to kinematic characteristics and relative trajectories are theoretically and analytically solved. Subsequently, the solution is quantitatively verified by a new experiment procedure, constructed by the authors. The geometrical treatments of the absolute experimental trajectories of two points of the body, allow determining the relative trajectory of a point from the other point. The kinematic parameters optimization, i.e., translational velocity, instantaneous velocity of rotation and initial kinematic conditions, are obtained, solving nonlinear leastsquares problems, based on LevenbergMarquardt’s algorithm. On the other hand, the response surfaces of the objective function and the sensitivity analysis of the different initial estimates of the analytical model parameters are also discussed. The comparison of the theoretical study results with experimental output shows that there are instruments to directly verify rather abstract mathematical theories even on the general mechanics program. Moreover, combining the theoretical description of the problem with an appropriate laboratory experiment and computational optimization procedures, gives a more exhaustive view of the physical problem as a whole.
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