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Dynamic Behaviour of Back to Back Planetary Gear in Run Up and Run Down Transient Regimes

Published online by Cambridge University Press:  11 August 2015

A. Hammami ,
A. Fernandez Del Rincon ,
F. Chaari ,
F. Viadero Rueda  and
M. Haddar
A. Hammami
Affiliation:
Mechanics, Modeling and Production Laboratory, National School of Engineers of Sfax, University of Sfax, Sfax, Tunisia Department of Structural and Mechanical Engineering, Faculty of Industrial and Telecommunications Engineering, University of Cantabria Santander, Spain
A. Fernandez Del Rincon
Affiliation:
Department of Structural and Mechanical Engineering, Faculty of Industrial and Telecommunications Engineering, University of Cantabria Santander, Spain
F. Chaari*
Affiliation:
Mechanics, Modeling and Production Laboratory, National School of Engineers of Sfax, University of Sfax, Sfax, Tunisia
F. Viadero Rueda
Affiliation:
Department of Structural and Mechanical Engineering, Faculty of Industrial and Telecommunications Engineering, University of Cantabria Santander, Spain
M. Haddar
Affiliation:
Mechanics, Modeling and Production Laboratory, National School of Engineers of Sfax, University of Sfax, Sfax, Tunisia
*
* Corresponding author (fakher.chaari@gmail.com)
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Abstract

The operating cycle of planetary gear transmissions is composed by the run up regime, steady state regime with fixed speed and the run down regime. Run up and run down are one of the main non stationary excitations for planetary gearboxes. This paper investigates, in these two regimes, the dynamic behaviour of a special configuration of two stages planetary gear which are mounted back-to-back. A dynamic model is developed. The variability of speed in the run up and run down regimes is included in the model. The computation of the dynamic response shows that additional sidebands instability zones are generated. Using the Short Time Fourier Transform, an amplitude-frequency modulation is observed in the non stationary condition. An experimental study done on a back-to-back planetary gear test rig is conducted for validation of the mathematic model.

Keywords

Back-to-back planetary gearsNon stationary conditionRun up and run downDynamic behaviour
Type
Research Article
Information
Journal of Mechanics , Volume 31 , Issue 4 , August 2015 , pp. 481 - 491
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2015 

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