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Influence of uncertainty in aerodynamic performance on the dynamic response of a two stage gear system

Tounsi M., Beyaoui M., Abboudi K., Feki N., Walha L., Haddar M.

Journal of Theoretical and Applied Mechanics

2016

Vol. 54 nr 2

601--612

In this paper, the nonlinear dynamic response in a wind turbine system is considered and the quantification of uncertainty effects on the variability of this nonlinear response is investigated. Under dynamic conditions, a lumped model with 12 degrees of freedom is proposed taking into account the uncertainty associated to the power coefficient of the input aerodynamic torque. The dynamic response of the two-stage spur gear system is obtained using ODE45 solver of Matlab. The Polynomial Chaos (PC) method is used to introduce the uncertainties on the proposed model. A comparison between the two dynamic responses given by the proposed lumped dynamic model takes into account the uncertainty. It is performed on the existed model without uncertainty. Thus, the efficiency and robustness of the proposed new methodology is evaluated.

Effect of camshaft eccentricity and follower backlash on the dynamic behaviour flexible cam mechanism

Tounsi M., Chaari F., Abbes M. S., Fakhfakh A. T., Haddar M.

Diagnostyka

2010

nr 2(54)

3-9

A cam follower system is modelled in this work. The equation of motion and the eigenfrequencies are recovered. The computation of the dynamic response is made by mean of combined implicit Newmark-Newton Raphson algorithm. Moreover, dynamic behaviour of the follower train is analysed in presence of an eccentricity in the camshaft and backlash between the follower rods and its guide.