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Pre-designing of a mechatronic system using an analytical approach with Dymola

Hamza G., Choley J.-Y., Hammadi M., Riviere A., Barkallah M., Louati J., Haddar M.

Journal of Theoretical and Applied Mechanics

2015

Vol. 53 nr 3

697--710

This paper presents a pre-dimensioning method applied to a mechatronic system and regarding the vibrational aspect, through a simple modeling process in Dymola environment. We study the vibration transmission between dynamic exciters (motors) and receivers (electronic cards) which are located on a simply supported rectangular plate, using an analytical approach. This new method will allow us to perform representative and robust modeling and simulation. The solution for this issue would be a pre-sizing and pre-positioning procedure. It aims to determine a set of possible technical solutions and principal characteristics before the definitive choice of components and precise sizing of the system. The presented method predicts also behaviour of the mechatronic system. In order to validate the model with respect to the finite element method, selected simulation results are presented.

Dynamic Response of Two-Stage Gear System Damaged by Teeth Defects

Walha L., Louati J., Fakhfakh T., Haddar M.

Machine Dynamics Problems

2005

Vol. 29, No. 3

107--124

In this paper, a linear time varying plane model of two stage spur gear system is formed to investigate the dynamic response for general spur gear location in the gearbox. The excitation is induced by two gear meshes stiffness fluctuations. This case describes the real working of the gearings. The calculation of the dynamic response is done by a step-by-step time integration method (Newmark method). One case of gears location is treated. Severe working conditions can lead to the system failure. Tooth crack and teeth scaling are one of these damages. They can occur on the first gear mesh contact and/or on the second one. In this paper they are discussed and modelled in the case of a two-stage gear system. The dynamic behavior of the healthy gear system and the defected one are compared both in the time domain and in the frequency domain. Wigner-Ville distribution method is used to show the dynamic behavior in the joint time-frequency domain and to localize the defected teeth.